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Xinmin Shen
Department of Mechanical Engineering, Field Engineering College, Army Engineering University of PLA, No. 1 Haifu Street, Nanjing 210007, China

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Journal article
Published: 14 June 2021 in Applied Physics Letters
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The single Helmholtz resonator obtains only one absorption peak in the broad frequency range, which limits its application in reducing the noise with multiple spectra. This paper reports an acoustic multi-layer Helmholtz resonance metamaterial, which can achieve multiple absorption peaks at given low-frequency targets. Meanwhile, through adjusting structural parameters of the multi-layer Helmholtz resonator, its impedance can be altered correspondingly to realize the absorption of noise with the multi groups of specific frequencies. In this paper, in order to achieve fine absorption performance with the specific frequencies of 100 and 400 Hz for a substation noise source, the sound absorption principle of a classical Helmholtz resonator with the embedded aperture is introduced theoretically, and then two series of multi-layer Helmholtz resonance structures with different parameters are designed. Thickness of the multi-layer structure is only 1/30th of the working wavelength, and two groups of resonance peaks are generated at 100 and 400 Hz, respectively. A finite element model of the multi-layer Helmholtz resonator is constructed to simulate its absorption performance. The samples are fabricated through the 3D light-curing printing, and their sound absorption performances are detected by the standing wave method. The simulation results are in good agreement with the experimental data, and two peaks with near-perfect absorptions are achieved at the target frequencies. The multi-layer Helmholtz resonator for achievement of three groups of absorption peaks is proposed later. This work provides an effective method to design a sound absorber with multiple absorption peaks, which can promote the application of acoustic metamaterials.

ACS Style

Haiqin Duan; Xinmin Shen; Enshuai Wang; Fei Yang; Xiaonan Zhang; Qin Yin. Acoustic multi-layer Helmholtz resonance metamaterials with multiple adjustable absorption peaks. Applied Physics Letters 2021, 118, 241904 .

AMA Style

Haiqin Duan, Xinmin Shen, Enshuai Wang, Fei Yang, Xiaonan Zhang, Qin Yin. Acoustic multi-layer Helmholtz resonance metamaterials with multiple adjustable absorption peaks. Applied Physics Letters. 2021; 118 (24):241904.

Chicago/Turabian Style

Haiqin Duan; Xinmin Shen; Enshuai Wang; Fei Yang; Xiaonan Zhang; Qin Yin. 2021. "Acoustic multi-layer Helmholtz resonance metamaterials with multiple adjustable absorption peaks." Applied Physics Letters 118, no. 24: 241904.

Journal article
Published: 02 April 2021 in Defence Technology
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Tire and rubber track interchangeable chassis combines the advantages of tire and rubber track, which can greatly improve the maneuverability of military construction machinery. However, there is almost no effective calculation model for the real-time static steering torque. When the relative sliding speed is greater than 0.01m/s, the influence of friction heating can not be ignored. An improved LuGre model is established to calculate the static real-time steering torque of tire and rubber track interchangeable chassis. Firstly, the friction heating model between rubber and ground is established. Combined with the influence of temperature on the dynamic performance of rubber material, the influence of friction heating on the stiffness and friction coefficient of rubber track is analyzed, and the improved LuGre friction model is established. The steering torque of tire and rubber track interchangeable chassis is affected by rubber material properties, steering speed, pavement type, and ambient temperature. Compared with the original LuGre model, the improved LuGre model captures the change in friction torque during multiple in-situ turns due to frictional heating. The error with the experimental data is small, which verifies the effectiveness of the improved LuGre model.

ACS Style

Kang Liang; Qun-Zhang Tu; Xin-Min Shen; Zhong-Hang Fang; Xuan Yang; Yong Zhang; Hui-Yu Xiang. An improved LuGre model for calculating static steering torque of rubber tracked chassis. Defence Technology 2021, 1 .

AMA Style

Kang Liang, Qun-Zhang Tu, Xin-Min Shen, Zhong-Hang Fang, Xuan Yang, Yong Zhang, Hui-Yu Xiang. An improved LuGre model for calculating static steering torque of rubber tracked chassis. Defence Technology. 2021; ():1.

Chicago/Turabian Style

Kang Liang; Qun-Zhang Tu; Xin-Min Shen; Zhong-Hang Fang; Xuan Yang; Yong Zhang; Hui-Yu Xiang. 2021. "An improved LuGre model for calculating static steering torque of rubber tracked chassis." Defence Technology , no. : 1.

Journal article
Published: 02 September 2020 in Polymer Testing
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With the purpose of improving the interfacial properties of aramid fibers reinforced rubber composites and enhancing the tensile strength of aramid fibers simultaneously, mercapto hyperbranched polysiloxane (HPSi) and functionalized graphene oxide (GO) were used to modify the surface of aramid fibers. Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and other characterization methods were performed to confirm the process of synergistic modification. Judging from the results of mechanical property tests, it could be acquired that the tensile strength of modified aramid fiber was increased by 16.8%, which could be ascribed to the wrapping effect of GO sheets. The interfacial properties were assessed by the pull-out tests of composites, and the results showed that the maximum pull-out force after synergistic surface modification was increased by 99.3%, which could be mainly related to additive reaction between double bonds and mercapto groups and the promotion of surface energy. More critically, during pull-out test, aramid fiber bundles might bring a part of shear stress into the grafted GO sheets, namely, GO sheets could convert fracture energy into interfacial energy, which would improve interfacial properties dramatically.

ACS Style

Xuan Yang; Qunzhang Tu; Xinmin Shen; Ming Pan; Chengming Jiang; Xitao Lai; Jinhong Xue. Synergistic modification by mercapto hyperbranched polysiloxane and functionalized graphene oxide on the surface of aramid fiber. Polymer Testing 2020, 91, 106783 .

AMA Style

Xuan Yang, Qunzhang Tu, Xinmin Shen, Ming Pan, Chengming Jiang, Xitao Lai, Jinhong Xue. Synergistic modification by mercapto hyperbranched polysiloxane and functionalized graphene oxide on the surface of aramid fiber. Polymer Testing. 2020; 91 ():106783.

Chicago/Turabian Style

Xuan Yang; Qunzhang Tu; Xinmin Shen; Ming Pan; Chengming Jiang; Xitao Lai; Jinhong Xue. 2020. "Synergistic modification by mercapto hyperbranched polysiloxane and functionalized graphene oxide on the surface of aramid fiber." Polymer Testing 91, no. : 106783.

Journal article
Published: 01 April 2020 in Applied Acoustics
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The microperforated compressed porous metal panel (MCPMP) absorber was proposed to develop novel sound absorber with excellent sound absorption performance, fewer utilized materials, and more lightweight. Through treating the compressed porous metal with high compression ratio as microperforated panel, theoretical sound absorption model of the MCPMP absorber was constructed through equivalent circuit approach. Structural parameters of the MCPMP absorber were optimized by cuckoo search algorithm for different target frequency range. The obtained optimal MCPMP absorbers were verified by finite element simulation and validated through standing wave tube measurement. Consistencies among the theoretical data, simulation data, and experimental data proved feasibility and accuracy of theoretical sound absorption model, cuckoo search optimization algorithm, and finite element simulation method. Actual average sound absorption coefficients of the optimal MCPMP absorbers with limited total thickness of 20 mm were 0.4679, 0.7069, and 0.7299 when the target frequency ranges were 100–2000 Hz, 100–4000 Hz, and 100–6000 Hz respectively. By comparison with sound absorption performance of the original porous metal and those of the 10-layer gradient compressed porous metal, effectiveness and practicality of the optimal MCPMP absorber was proved. The developed MCPMP absorber was favorable to enrich the sound absorption theory and promote its practical application.

ACS Style

Haiqin Duan; Xinmin Shen; Qin Yin; Fei Yang; Panfeng Bai; Xiaonan Zhang; Ming Pan. Modeling and optimization of sound absorption coefficient of microperforated compressed porous metal panel absorber. Applied Acoustics 2020, 166, 107322 .

AMA Style

Haiqin Duan, Xinmin Shen, Qin Yin, Fei Yang, Panfeng Bai, Xiaonan Zhang, Ming Pan. Modeling and optimization of sound absorption coefficient of microperforated compressed porous metal panel absorber. Applied Acoustics. 2020; 166 ():107322.

Chicago/Turabian Style

Haiqin Duan; Xinmin Shen; Qin Yin; Fei Yang; Panfeng Bai; Xiaonan Zhang; Ming Pan. 2020. "Modeling and optimization of sound absorption coefficient of microperforated compressed porous metal panel absorber." Applied Acoustics 166, no. : 107322.

Journal article
Published: 20 March 2020 in Applied Sciences
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Sound absorption performance of polyurethane foam could be improved by adding a prepositive microperforated polymethyl methacrylate panel to form a composite sound-absorbing structure. A theoretical sound absorption model of polyurethane foam and that of the composite structure were constructed by the transfer matrix method based on the Johnson–Champoux–Allard model and Maa’s theory. Acoustic parameter identification of the polyurethane foam and structural parameter optimization of the composite structures were obtained by the cuckoo search algorithm. The identified porosity and static flow resistivity were 0.958 and 13078 Pa·s/m2 respectively, and their accuracies were proved by the experimental validation. Sound absorption characteristics of the composite structures were verified by finite element simulation in virtual acoustic laboratory and validated through standing wave tube measurement in AWA6128A detector. Consistencies among the theoretical data, simulation data, and experimental data of sound absorption coefficients of the composite structures proved the effectiveness of the theoretical sound absorption model, cuckoo search algorithm, and finite element simulation method. Comparisons of actual average sound absorption coefficients of the optimal composite structure with those of the original polyurethane foam proved the practicability of this identification and optimization method, which was propitious to promote its practical application in noise reduction.

ACS Style

Xiaocui Yang; Xinmin Shen; Haiqin Duan; Fei Yang; Xiaonan Zhang; Ming Pan; Qin Yin. Improving and Optimizing Sound Absorption Performance of Polyurethane Foam by Prepositive Microperforated Polymethyl Methacrylate Panel. Applied Sciences 2020, 10, 2103 .

AMA Style

Xiaocui Yang, Xinmin Shen, Haiqin Duan, Fei Yang, Xiaonan Zhang, Ming Pan, Qin Yin. Improving and Optimizing Sound Absorption Performance of Polyurethane Foam by Prepositive Microperforated Polymethyl Methacrylate Panel. Applied Sciences. 2020; 10 (6):2103.

Chicago/Turabian Style

Xiaocui Yang; Xinmin Shen; Haiqin Duan; Fei Yang; Xiaonan Zhang; Ming Pan; Qin Yin. 2020. "Improving and Optimizing Sound Absorption Performance of Polyurethane Foam by Prepositive Microperforated Polymethyl Methacrylate Panel." Applied Sciences 10, no. 6: 2103.

Journal article
Published: 03 March 2020 in Metals
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Porous metal is widely used in the fields of sound absorption and noise reduction, and it is a critical procedure to identify acoustic characteristic parameters and to improve sound absorption performances. Based on the constructed theoretical sound absorption model and experimental data, acoustic characteristic parameters of the porous metal were identified through the cuckoo search identification algorithm, and their reliabilities were certified through comparing with these labeled parameters and further experimental validation. By adding the microperforated metal panel in front of the porous metal, a composite sound-absorbing structure was formed, which aimed to improve the sound absorption performance of the original porous metal by optimizing the parameters. Finite element simulation and a standing wave tube measurement were conducted to validate the effectiveness and practicability of the optimal composite sound-absorbing structure. Consistencies among theoretical predictions, simulation results, and experimental data proved the effectiveness of the identification and optimization method. When the target frequency ranges were 100–1000 Hz, 100–2000 Hz, 100–3000 Hz, and 100–4000 Hz. Actual average sound absorption coefficients of the optimal composite structures were 0.5154, 0.6369, 0.6770, and 0.7378, respectively, which exhibited the obvious improvements with a tiny increase in the occupied space and a small addition in weight.

ACS Style

Xiaocui Yang; Xinmin Shen; Haiqin Duan; Xiaonan Zhang; Qin Yin. Identification of Acoustic Characteristic Parameters and Improvement of Sound Absorption Performance for Porous Metal. Metals 2020, 10, 340 .

AMA Style

Xiaocui Yang, Xinmin Shen, Haiqin Duan, Xiaonan Zhang, Qin Yin. Identification of Acoustic Characteristic Parameters and Improvement of Sound Absorption Performance for Porous Metal. Metals. 2020; 10 (3):340.

Chicago/Turabian Style

Xiaocui Yang; Xinmin Shen; Haiqin Duan; Xiaonan Zhang; Qin Yin. 2020. "Identification of Acoustic Characteristic Parameters and Improvement of Sound Absorption Performance for Porous Metal." Metals 10, no. 3: 340.

Journal article
Published: 05 December 2019 in Applied Sciences
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Nowadays, piezoelectric actuators are widely used, but are rarely applied in high overload environments due to th difficulty implementing them. Traveling wave rotary ultrasonic motors (TRUMs) have the characteristics of variable structure and are insensitive to overload, endowing them with the potential ability of high overload resistance. In this study, four TRUMs with different rotor structures are designed to work under the high-impact acceleration of 10,000 g through modifying the rotors with a designed slotted disc spring. The dynamics model is established, the impact process is simulated, and the results are analyzed successively. The high-impact test, deformation measurement and performance test of the motors are carried out to verify the modification. The results show that performance of the TRUMs with a disc spring declines much less than those without a disc spring after the high-impact test. The TRUM-4 with the modified rotor and disc spring has the best performance, the speed of which decreased only 1.6% at the torque of 0.15 N m, and it is considered to be capable of withstanding the high acceleration of 10,000 g. This work is significance for guiding the ultrasonic motors’ optimization to expand their application in high-overload environments.

ACS Style

Jiaojiao Zhang; Lin Yang; Haisong Chen; Chengcheng Ma; Xinmin Shen; Liang Chen. Design of Travelling-Wave Rotating Ultrasonic Motor under High Overload Environments: Impact Dynamics Simulation and Experimental Validation. Applied Sciences 2019, 9, 5309 .

AMA Style

Jiaojiao Zhang, Lin Yang, Haisong Chen, Chengcheng Ma, Xinmin Shen, Liang Chen. Design of Travelling-Wave Rotating Ultrasonic Motor under High Overload Environments: Impact Dynamics Simulation and Experimental Validation. Applied Sciences. 2019; 9 (24):5309.

Chicago/Turabian Style

Jiaojiao Zhang; Lin Yang; Haisong Chen; Chengcheng Ma; Xinmin Shen; Liang Chen. 2019. "Design of Travelling-Wave Rotating Ultrasonic Motor under High Overload Environments: Impact Dynamics Simulation and Experimental Validation." Applied Sciences 9, no. 24: 5309.

Journal article
Published: 09 November 2019 in Applied Sciences
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The composite structure of a microperforated panel and porous metal is a promising sound absorber for industrial noise reduction, sound absorption performance of which can be improved through parameter optimization. A theoretical model is constructed for the composite structure of a microperforated panel and porous metal based on Maa’s theory and the Johnson–Champoux–Allard model. When the limited total thickness is 30 mm, 50 mm, and 100 mm respectively, dimensional optimization of structural parameters of the proposed composite structure is conducted for the optimal average sound absorption coefficient in the frequency range (2000 Hz, 6000 Hz) through a cuckoo search algorithm. Simulation models of the composite structures with optimal structural parameters are constructed based on the finite element method. Validations of the optimal composite structures are conducted based on the standing wave tube method. Comparative analysis of the theoretical data, simulation data, and experimental data validates feasibility and effectiveness of the parameter optimization. The optimal sandwich structure with an actual total thickness of 36.8 mm can obtain the average sound absorption coefficient of 97.65% in the frequency range (2000 Hz, 6000 Hz), which is favorable to promote practical application of the composite structures in the fields of sound absorption and noise reduction.

ACS Style

Haiqin Duan; Xinmin Shen; Fei Yang; Panfeng Bai; Xiaofang Lou; Zhizhong Li. Parameter Optimization for Composite Structures of Microperforated Panel and Porous Metal for Optimal Sound Absorption Performance. Applied Sciences 2019, 9, 4798 .

AMA Style

Haiqin Duan, Xinmin Shen, Fei Yang, Panfeng Bai, Xiaofang Lou, Zhizhong Li. Parameter Optimization for Composite Structures of Microperforated Panel and Porous Metal for Optimal Sound Absorption Performance. Applied Sciences. 2019; 9 (22):4798.

Chicago/Turabian Style

Haiqin Duan; Xinmin Shen; Fei Yang; Panfeng Bai; Xiaofang Lou; Zhizhong Li. 2019. "Parameter Optimization for Composite Structures of Microperforated Panel and Porous Metal for Optimal Sound Absorption Performance." Applied Sciences 9, no. 22: 4798.

Journal article
Published: 22 October 2019 in Applied Acoustics
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Practicability and applicability of the sound absorber can be improved by reducing its total thickness. The thin sound absorber was developed by optimizing the multilayer compressed porous metal with the rear cavity in this research. Theoretical model of sound absorption coefficient of the multilayer compressed porous metal with the rear cavity was constructed through the transfer matrix method based on Johnson-Champoux-Allard model, and its structural parameters were optimized to obtain optimal average sound absorption coefficient in 100–6000 Hz by the cuckoo search algorithm. Finite element simulation of the sound absorbers was conducted in the virtual acoustic laboratory for preliminary verification. According to the optimal structural parameters, single compressed porous metals were prepared and assembled to the optimal multilayer compressed porous metal with the rear cavity, and their sound absorption coefficients in 100–6000 Hz were measured according to standing wave tube method. Through theoretical modeling, parameter optimization, finite element simulation, and standing wave tube measurement, an effective sound absorber with the average sound absorption coefficient of 0.5105 in the 100–6000 Hz was developed by optimal 4-layer compressed porous metal with the total thickness of 5 mm, which would promote its application in the noise reduction field.

ACS Style

Xinmin Shen; Panfeng Bai; Liang Chen; Sandy To; Fei Yang; Xiaonan Zhang; Qin Yin. Development of thin sound absorber by parameter optimization of multilayer compressed porous metal with rear cavity. Applied Acoustics 2019, 159, 107071 .

AMA Style

Xinmin Shen, Panfeng Bai, Liang Chen, Sandy To, Fei Yang, Xiaonan Zhang, Qin Yin. Development of thin sound absorber by parameter optimization of multilayer compressed porous metal with rear cavity. Applied Acoustics. 2019; 159 ():107071.

Chicago/Turabian Style

Xinmin Shen; Panfeng Bai; Liang Chen; Sandy To; Fei Yang; Xiaonan Zhang; Qin Yin. 2019. "Development of thin sound absorber by parameter optimization of multilayer compressed porous metal with rear cavity." Applied Acoustics 159, no. : 107071.

Journal article
Published: 11 September 2019 in Applied Sciences
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The braking energy can be recovered and recycled by the regenerative braking system, which is significant to improve economics and environmental effect of the hydraulic hybrid vehicle. Influencing factors for the energy recovery rate of regenerative braking system in hydraulic hybrid vehicle were investigated in this study. Based on the theoretical analysis of accumulator and energy recovery rate, modeling of the regenerative braking system and its energy management strategy was conducted in the simulation platform of LMS Imagine Lab AMESim. The simulation results indicated that the influencing factors included braking intensity, initial pressure of the accumulator, and initial braking speed, and the optimal energy recovery rate of 87.61% was achieved when the parameters were 0.4, 19 MPa, and 300 rpm, respectively. Experimental bench was constructed and a series of experiments on energy recovery rate with different parameters were conducted, which aimed to validate the simulation results. It could be found, that with the optimal parameters obtained in the simulation process, the actual energy recovery rate achieved in the experiment was 83.33%, which was almost consistent with the simulation result. The obtained high energy recovery rate would promote the application of regenerative braking system in the hydraulic hybrid vehicle.

ACS Style

Lei Xu; Xiaohui He; Xinmin Shen. Improving Energy Recovery Rate of the Regenerative Braking System by Optimization of Influencing Factors. Applied Sciences 2019, 9, 3807 .

AMA Style

Lei Xu, Xiaohui He, Xinmin Shen. Improving Energy Recovery Rate of the Regenerative Braking System by Optimization of Influencing Factors. Applied Sciences. 2019; 9 (18):3807.

Chicago/Turabian Style

Lei Xu; Xiaohui He; Xinmin Shen. 2019. "Improving Energy Recovery Rate of the Regenerative Braking System by Optimization of Influencing Factors." Applied Sciences 9, no. 18: 3807.

Journal article
Published: 01 September 2019 in Polymer Testing
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ACS Style

Xuan Yang; Qunzhang Tu; Xinmin Shen; Ming Pan; Chengming Jiang; Pengxiao Zhu; Yi Li; Pei Li; CaiBing Hu. Surface modification of Poly(p-phenylene terephthalamide) fibers by polydopamine-polyethyleneimine/graphene oxide multilayer films to enhance interfacial adhesion with rubber matrix. Polymer Testing 2019, 78, 1 .

AMA Style

Xuan Yang, Qunzhang Tu, Xinmin Shen, Ming Pan, Chengming Jiang, Pengxiao Zhu, Yi Li, Pei Li, CaiBing Hu. Surface modification of Poly(p-phenylene terephthalamide) fibers by polydopamine-polyethyleneimine/graphene oxide multilayer films to enhance interfacial adhesion with rubber matrix. Polymer Testing. 2019; 78 ():1.

Chicago/Turabian Style

Xuan Yang; Qunzhang Tu; Xinmin Shen; Ming Pan; Chengming Jiang; Pengxiao Zhu; Yi Li; Pei Li; CaiBing Hu. 2019. "Surface modification of Poly(p-phenylene terephthalamide) fibers by polydopamine-polyethyleneimine/graphene oxide multilayer films to enhance interfacial adhesion with rubber matrix." Polymer Testing 78, no. : 1.

Journal article
Published: 24 July 2019 in Polymers
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To enhance the interfacial adhesion between poly(p-phenylene terephthalamide) (PPTA) fibers and a rubber matrix without damaging the fiber structures, aminated carbon nanotubes (NH2-CNTs) were mildly deposited onto the fiber surface by combining the biomimetic modification of dopamine via the Michael addition reaction. Furthermore, differences between the "one-step" method and the "two-step" method were researched through adjusting the addition sequence of NH2-CNTs. The surface morphologies and chemical structures of PPTA fibers before and after modification were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The mechanical properties of fibers and the adhesive properties with rubber were tested using an electronic tensile tester of single-filament and universal testing machine, respectively. After modification by the "one-step" method for 24 h, the single-filament tensile strength of the modified fibers increased by 16.5%, meanwhile, the pull-out force of the modified fibers to rubber increased by approximately 59.7%. Compared with the "two-step" method, the "one-step" method had superiority due to the short reaction time and the large deposition rate of CNTs.

ACS Style

Xuan Yang; Qunzhang Tu; Xinmin Shen; Qin Yin; Ming Pan; Chengming Jiang; CaiBing Hu. Enhancing the Interfacial Adhesion with Rubber Matrix by Grafting Polydopamine-Carbon Nanotubes onto Poly(p-phenylene terephthalamide) Fibers. Polymers 2019, 11, 1231 .

AMA Style

Xuan Yang, Qunzhang Tu, Xinmin Shen, Qin Yin, Ming Pan, Chengming Jiang, CaiBing Hu. Enhancing the Interfacial Adhesion with Rubber Matrix by Grafting Polydopamine-Carbon Nanotubes onto Poly(p-phenylene terephthalamide) Fibers. Polymers. 2019; 11 (8):1231.

Chicago/Turabian Style

Xuan Yang; Qunzhang Tu; Xinmin Shen; Qin Yin; Ming Pan; Chengming Jiang; CaiBing Hu. 2019. "Enhancing the Interfacial Adhesion with Rubber Matrix by Grafting Polydopamine-Carbon Nanotubes onto Poly(p-phenylene terephthalamide) Fibers." Polymers 11, no. 8: 1231.

Journal article
Published: 21 May 2019 in Metals
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Sound absorption performance of a porous metal can be improved by compression and optimal permutation, which is favorable to promote its application in noise reduction. The 10-layer gradient compressed porous metal was proposed to obtain optimal sound absorption performance. A theoretical model of the sound absorption coefficient of the multilayer gradient compressed porous metal was constructed according to the Johnson-Champoux-Allard model. Optimal parameters for the best sound absorption performance of the 10-layer gradient compressed porous metal were achieved by a cuckoo search algorithm with the varied constraint conditions. Preliminary verification of the optimal sound absorber was conducted by the finite element simulation, and further experimental validation was obtained through the standing wave tube measurement. Consistencies among the theoretical data, the simulation data, and the experimental data proved accuracies of the theoretical sound absorption model, the cuckoo search optimization algorithm, and the finite element simulation method. For the investigated frequency ranges of 100–1000 Hz, 100–2000 Hz, 100–4000 Hz, and 100–6000 Hz, actual average sound absorption coefficients of optimal 10-layer gradient compressed porous metal were 0.3325, 0.5412, 0.7461, and 0.7617, respectively, which exhibited the larger sound absorption coefficients relative to those of the original porous metals and uniform 10-layer compressed porous metal with the same thickness of 20 mm.

ACS Style

Fei Yang; Xinmin Shen; Panfeng Bai; Xiaonan Zhang; Zhizhong Li; Qin Yin. Optimization and Validation of Sound Absorption Performance of 10-Layer Gradient Compressed Porous Metal. Metals 2019, 9, 588 .

AMA Style

Fei Yang, Xinmin Shen, Panfeng Bai, Xiaonan Zhang, Zhizhong Li, Qin Yin. Optimization and Validation of Sound Absorption Performance of 10-Layer Gradient Compressed Porous Metal. Metals. 2019; 9 (5):588.

Chicago/Turabian Style

Fei Yang; Xinmin Shen; Panfeng Bai; Xiaonan Zhang; Zhizhong Li; Qin Yin. 2019. "Optimization and Validation of Sound Absorption Performance of 10-Layer Gradient Compressed Porous Metal." Metals 9, no. 5: 588.

Journal article
Published: 30 April 2019 in Materials
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Increasing absorption efficiency and decreasing total thickness of the acoustic absorber is favorable to promote its practical application. Four compressed porous metals with compression ratios of 0%, 30%, 60%, and 90% were prepared to assemble the four-layer gradient compressed porous metals, which aimed to develop the acoustic absorber with high-efficiency and thin thickness. Through deriving structural parameters of thickness, porosity, and static flow resistivity for the compressed porous metals, theoretical models of sound absorption coefficients of the gradient compressed porous metals were constructed through transfer matrix method according to the Johnson-Champoux-Allard model. Sound absorption coefficients of four-layer gradient compressed porous metals with the different permutations were theoretically analyzed and experimentally measured, and the optimal average sound absorption coefficient of 60.33% in 100-6000 Hz was obtained with the total thickness of 11 mm. Sound absorption coefficients of the optimal gradient compressed porous metal were further compared with those of the simple superposed compressed porous metal, which proved that the former could obtain higher absorption efficiency with thinner thickness and fewer materials. These phenomena were explored by morphology characterizations. The developed high-efficiency and thin-thickness acoustic absorber of gradient compressed porous metal can be applied in acoustic environmental detection and industrial noise reduction.

ACS Style

Xiaocui Yang; Xinmin Shen; Panfeng Bai; Xiaohui He; Xiaonan Zhang; Zhizhong Li; Liang Chen; Qin Yin. Preparation and Characterization of Gradient Compressed Porous Metal for High-Efficiency and Thin-Thickness Acoustic Absorber. Materials 2019, 12, 1413 .

AMA Style

Xiaocui Yang, Xinmin Shen, Panfeng Bai, Xiaohui He, Xiaonan Zhang, Zhizhong Li, Liang Chen, Qin Yin. Preparation and Characterization of Gradient Compressed Porous Metal for High-Efficiency and Thin-Thickness Acoustic Absorber. Materials. 2019; 12 (9):1413.

Chicago/Turabian Style

Xiaocui Yang; Xinmin Shen; Panfeng Bai; Xiaohui He; Xiaonan Zhang; Zhizhong Li; Liang Chen; Qin Yin. 2019. "Preparation and Characterization of Gradient Compressed Porous Metal for High-Efficiency and Thin-Thickness Acoustic Absorber." Materials 12, no. 9: 1413.

Journal article
Published: 11 April 2019 in Applied Sciences
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The combination structure of a porous metal and microperforated panel was optimized to develop a low frequency sound absorber. Theoretical models were constructed by the transfer matrix method based on the Johnson—Champoux—Allard model and Maa’s theory. Parameter optimizations of the sound absorbers were conducted by Cuckoo search algorithm. The sound absorption coefficients of the combination structures were verified by finite element simulation and validated by standing wave tube measurement. The experimental data was consistent with the theoretical and simulation data, which proved the efficiency, reliability, and accuracy of the constructed theoretical sound absorption model and finite element model. The actual average sound absorption coefficient of the microperforated panel + cavity + porous metal + cavity sound absorber in the 100–1800 Hz range reached 62.9615% and 73.5923%, respectively, when the limited total thickness was 30 mm and 50 mm. The excellent low frequency sound absorbers obtained can be used in the fields of acoustic environmental protection and industrial noise reduction.

ACS Style

Xinmin Shen; Panfeng Bai; Xiaocui Yang; Xiaonan Zhang; Sandy To. Low Frequency Sound Absorption by Optimal Combination Structure of Porous Metal and Microperforated Panel. Applied Sciences 2019, 9, 1507 .

AMA Style

Xinmin Shen, Panfeng Bai, Xiaocui Yang, Xiaonan Zhang, Sandy To. Low Frequency Sound Absorption by Optimal Combination Structure of Porous Metal and Microperforated Panel. Applied Sciences. 2019; 9 (7):1507.

Chicago/Turabian Style

Xinmin Shen; Panfeng Bai; Xiaocui Yang; Xiaonan Zhang; Sandy To. 2019. "Low Frequency Sound Absorption by Optimal Combination Structure of Porous Metal and Microperforated Panel." Applied Sciences 9, no. 7: 1507.

Journal article
Published: 20 February 2019 in Polymers
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In order to enhance the interfacial adhesion of poly(p-phenylene terephthalamide) (PPTA) fibers to the rubber composites, a novel method to deposit multi-walled carbon nanotubes (MWCNTs) onto the surface of PPTA fibers has been proposed in this study. This chemical modification was performed through the introduction of epoxy groups by Friedel–Crafts alkylation on the PPTA fibers, the carboxylation of MWCNTs, and the ring-opening reaction between the epoxy groups and the carboxyl groups. The morphologies, chemical structures, and compositions of the surface of PPTA fibers were characterized by scanning electron microscope, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The results showed that MWCNTs were uniformly deposited onto the surface of PPTA fibers with the covalent bonds. The measurement of contact angles of the fibers with polar solvent and non-polar solvent indicated that the surface energy of deposited fibers significantly increased by 41.9% compared with the untreated fibers. An electronic tensile tester of single-filament and a universal testing machine were utilized to measure the strength change of the fibers after modification and the interfacial adhesion between the fibers and the rubber matrix, respectively. The results showed that the tensile strength had not been obviously reduced, and the pull-out force and peeling strength of the fibers to the rubber increased by 46.3% and 56.5%, respectively.

ACS Style

Xuan Yang; Qunzhang Tu; Xinmin Shen; Pengxiao Zhu; Yi Li; Shuai Zhang. A Novel Method for Deposition of Multi-Walled Carbon Nanotubes onto Poly(p-Phenylene Terephthalamide) Fibers to Enhance Interfacial Adhesion with Rubber Matrix. Polymers 2019, 11, 374 .

AMA Style

Xuan Yang, Qunzhang Tu, Xinmin Shen, Pengxiao Zhu, Yi Li, Shuai Zhang. A Novel Method for Deposition of Multi-Walled Carbon Nanotubes onto Poly(p-Phenylene Terephthalamide) Fibers to Enhance Interfacial Adhesion with Rubber Matrix. Polymers. 2019; 11 (2):374.

Chicago/Turabian Style

Xuan Yang; Qunzhang Tu; Xinmin Shen; Pengxiao Zhu; Yi Li; Shuai Zhang. 2019. "A Novel Method for Deposition of Multi-Walled Carbon Nanotubes onto Poly(p-Phenylene Terephthalamide) Fibers to Enhance Interfacial Adhesion with Rubber Matrix." Polymers 11, no. 2: 374.

Journal article
Published: 05 February 2019 in Materials & Design
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Novel acoustic absorbers were fabricated by the compression and microperforation of the porous metal, which aimed to develop practical acoustic absorbers for the noise reduction. Sound absorbing coefficients of the five investigated acoustic absorbers were measured by the AWA6128A detector according to the standing wave method, and their trends were consistent with normal sound absorption principle of the porous metal absorber and that of the microperforated panel absorber. The results proved that with same length of the cavity, sound absorption performance could be obviously improved by the compression and microperforation. When length of the cavity was 20 mm, average sound absorbing coefficient of the compressed and microperforated porous metal panel absorber in frequency range 100–6000 Hz reached 59.69%, which was superior to that 25.70% of original porous metal absorber and that 31.49% of the microperforated spring steel panel absorber. In the constructed semi-empirical model, a fourth-order polynomial function was treated as the coupling function to express the superposition absorption effect, and its veracity and reliability was validated by two replication experiments. Micromorphology of the compressed and microperforated porous metal panel provided the intuitive explanations to the improvement of its sound absorption performance.

ACS Style

Panfeng Bai; Xiaocui Yang; Xinmin Shen; Xiaonan Zhang; Zhizhong Li; Qin Yin; Guoliang Jiang; Fei Yang. Sound absorption performance of the acoustic absorber fabricated by compression and microperforation of the porous metal. Materials & Design 2019, 167, 107637 .

AMA Style

Panfeng Bai, Xiaocui Yang, Xinmin Shen, Xiaonan Zhang, Zhizhong Li, Qin Yin, Guoliang Jiang, Fei Yang. Sound absorption performance of the acoustic absorber fabricated by compression and microperforation of the porous metal. Materials & Design. 2019; 167 ():107637.

Chicago/Turabian Style

Panfeng Bai; Xiaocui Yang; Xinmin Shen; Xiaonan Zhang; Zhizhong Li; Qin Yin; Guoliang Jiang; Fei Yang. 2019. "Sound absorption performance of the acoustic absorber fabricated by compression and microperforation of the porous metal." Materials & Design 167, no. : 107637.

Journal article
Published: 01 January 2019 in Journal of Porous Media
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Xiaocui Yang; Panfeng Bai; Xinmin Shen; Xiaonan Zhang; Jingwei Zhu; Qin Yin; Kang Peng. THEORETICAL MODELING AND EXPERIMENTAL VALIDATION OF SOUND-ABSORBING COEFFICIENT OF POROUS IRON. Journal of Porous Media 2019, 22, 225 -241.

AMA Style

Xiaocui Yang, Panfeng Bai, Xinmin Shen, Xiaonan Zhang, Jingwei Zhu, Qin Yin, Kang Peng. THEORETICAL MODELING AND EXPERIMENTAL VALIDATION OF SOUND-ABSORBING COEFFICIENT OF POROUS IRON. Journal of Porous Media. 2019; 22 (2):225-241.

Chicago/Turabian Style

Xiaocui Yang; Panfeng Bai; Xinmin Shen; Xiaonan Zhang; Jingwei Zhu; Qin Yin; Kang Peng. 2019. "THEORETICAL MODELING AND EXPERIMENTAL VALIDATION OF SOUND-ABSORBING COEFFICIENT OF POROUS IRON." Journal of Porous Media 22, no. 2: 225-241.

Journal article
Published: 06 December 2018 in Applied Acoustics
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Sound absorption performance of the multilayer microperforated panel can be improved through optimal design of structural parameters. Theoretical model of sound absorbing coefficient of the multilayer microperforated panel with different layers was constructed according to Maa’s theory. Structural parameters of the multilayer microperforated panel with layer number from 1 to 8 were optimized through the cuckoo search algorithm with constraint conditions. Preliminary verifications of the achieved optimal parameters were conducted by the analog simulation according to the finite element method. The obtained optimal design of multilayer microperforated panel with no more than 4 layers was finally validated by testing experiments based on the standing wave method, and the optimal average sound absorbing coefficients in the frequency range of 100–6000 Hz were 57.21%, 66.29%, 68.33%, and 69.36%, respectively. Through theoretical modeling, parameter optimization, analog simulation, and experimental validation, an effective method for development of the desired sound absorber was proposed, which will be propitious to promote the applications of the multilayer microperforated panel products in the field of noise reduction.

ACS Style

Xiaocui Yang; Panfeng Bai; Xinmin Shen; Sandy To; Liang Chen; Xiaonan Zhang; Qin Yin. Optimal design and experimental validation of sound absorbing multilayer microperforated panel with constraint conditions. Applied Acoustics 2018, 146, 334 -344.

AMA Style

Xiaocui Yang, Panfeng Bai, Xinmin Shen, Sandy To, Liang Chen, Xiaonan Zhang, Qin Yin. Optimal design and experimental validation of sound absorbing multilayer microperforated panel with constraint conditions. Applied Acoustics. 2018; 146 ():334-344.

Chicago/Turabian Style

Xiaocui Yang; Panfeng Bai; Xinmin Shen; Sandy To; Liang Chen; Xiaonan Zhang; Qin Yin. 2018. "Optimal design and experimental validation of sound absorbing multilayer microperforated panel with constraint conditions." Applied Acoustics 146, no. : 334-344.

Conference paper
Published: 11 October 2018 in IOP Conference Series: Earth and Environmental Science
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Oxidation-assisted polishing has been developed as an efficient method for precision machining of reaction-sintered silicon carbide (RS-SiC), and characteristic of the oxide layer is the critical factor to obtain a fine surface property. Machinability of the oxide layer obtained in anodic oxidation of RS-SiC by the pure-water under high-frequency-square-wave potential is investigated by the ceria slurry polishing in this study. Quantitative analysis of surface quality of the oxidized RS-SiC sample is conducted by the scanning white light interferometer (SWLI) measurement. Along with increase of the oxidation time, surface quality of the oxidized RS-SiC is changing better at the beginning, and rapidly deteriorated in further oxidation process. Surface qualities of the RS-SiC sample before oxidation, after oxidation, after HF etching, and after abrasive polishing, are compared by the SWLI measurement. Surface roughness rms after anodic oxidation for 60min is 189.004nm. After removing the oxide by ceria slurry polishing, the rms can reach 3.688nm. Meanwhile, there is no visible scratch on the new revealed surface. Therefore, combination of anodic oxidation of RS-SiC by pure water and abrasive polishing of oxide layer by ceria slurry can be considered as an efficient method to machine RS-SiC.

ACS Style

Xiaocui Yang; Xinmin Shen; Zhizhong Li; Qunzhang Tu; Qin Yin. Investigation on machinability of the oxide layer in anodic oxidation of reaction-sintered silicon carbide by pure-water. IOP Conference Series: Earth and Environmental Science 2018, 186, 012044 .

AMA Style

Xiaocui Yang, Xinmin Shen, Zhizhong Li, Qunzhang Tu, Qin Yin. Investigation on machinability of the oxide layer in anodic oxidation of reaction-sintered silicon carbide by pure-water. IOP Conference Series: Earth and Environmental Science. 2018; 186 (3):012044.

Chicago/Turabian Style

Xiaocui Yang; Xinmin Shen; Zhizhong Li; Qunzhang Tu; Qin Yin. 2018. "Investigation on machinability of the oxide layer in anodic oxidation of reaction-sintered silicon carbide by pure-water." IOP Conference Series: Earth and Environmental Science 186, no. 3: 012044.