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Wen Wang
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China

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Journal article
Published: 07 June 2021 in Measurement Science and Technology
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ACS Style

Chuanyong Wang; Wen Wang; Jianxuan Xu; Keqing Lu; Zhiqian Sang; Zhanfeng Chen. Research on improving the measurement accuracy of the AACMM based on indexing joint. Measurement Science and Technology 2021, 1 .

AMA Style

Chuanyong Wang, Wen Wang, Jianxuan Xu, Keqing Lu, Zhiqian Sang, Zhanfeng Chen. Research on improving the measurement accuracy of the AACMM based on indexing joint. Measurement Science and Technology. 2021; ():1.

Chicago/Turabian Style

Chuanyong Wang; Wen Wang; Jianxuan Xu; Keqing Lu; Zhiqian Sang; Zhanfeng Chen. 2021. "Research on improving the measurement accuracy of the AACMM based on indexing joint." Measurement Science and Technology , no. : 1.

Journal article
Published: 14 April 2021 in Applied Ocean Research
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Due to water, sediment and chemical contaminants etc., the internal corrosion of subsea pipelines is inevitable. The internal corrosion is usually at or near the bottom of the subsea pipeline where the water and sediment can settle out of the transport medium. After some time, narrow and long defects occur in pipelines. Besides, as the temperature changes, the pipe is often stretched. Pipelines with long corrosion defect and axial tension subjected to high internal pressure have potential failure risk in service. In this paper, the effect of long corrosion defect and axial tension on the burst pressure of subsea pipelines are studied. Firstly, the pipelines with narrow and long corrosion defects are simplified as the Apollonius model. Then, a semi-empirical burst pressure equation of corroded pipelines subjected to internal pressure and axial tension is presented. Next, the accuracy of the burst pressure equation is verified by given experimental data. In the end, the effects of long corrosion defect and axial tension on burst pressure are analyzed. The results reveal that both axial tension and long corrosion defects can greatly reduce the burst pressure of pipelines. It is beneficial to assess the integrity of pipelines subjected high internal pressure and deepen the understanding of pipeline failure behavior.

ACS Style

Zhan-Feng Chen; Wen Wang; He Yang; Sun-Ting Yan; Zhi-Jiang Jin. On the effect of long corrosion defect and axial tension on the burst pressure of subsea pipelines. Applied Ocean Research 2021, 111, 102637 .

AMA Style

Zhan-Feng Chen, Wen Wang, He Yang, Sun-Ting Yan, Zhi-Jiang Jin. On the effect of long corrosion defect and axial tension on the burst pressure of subsea pipelines. Applied Ocean Research. 2021; 111 ():102637.

Chicago/Turabian Style

Zhan-Feng Chen; Wen Wang; He Yang; Sun-Ting Yan; Zhi-Jiang Jin. 2021. "On the effect of long corrosion defect and axial tension on the burst pressure of subsea pipelines." Applied Ocean Research 111, no. : 102637.

Journal article
Published: 18 March 2021 in Journal of Petroleum Science and Engineering
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Expansion of mudstone through absorbing water can increase local stress in information, which is one of the main reasons for casing damage in mudstone. To establish a reasonable mechanical model of local stress increase is the key problem for casing damage in locally expansive mudstone. Many models of uniform stress or linear stress are established to simulate the local stress increase. However, the accuracy and scientificity for those models are insufficient. In this paper, a study on casing strength in locally expansive mudstone is carried out based on theoretical analysis and numerical calculation. Firstly, a mechanical model of casings under parabolic-like loads is established to simulate the local stress increase. Then, an analytical solution of casings is obtained based on the stress function method. Next, a finite element calculation of casings under the same boundary condition is carried out. In the end, the comparisons between analytical solution and finite element method (FEM) are conducted. The results reveal that the theoretical solutions are in good agreement with the FEM. In addition, a novel predicting method of the casing stress in locally expansive mudstone is presented. Finally, our theoretical analysis can be the standard for numerical and approximate calculations. It is helpful to explore the casing damage mechanism in mudstone layer and reduce the casing collapse in complex underground environment.

ACS Style

Zhan-Feng Chen; Xu-Yao Li; Wen Wang; Ke-Qing Lu; Wei-Ping Zhu. Theoretical analysis of casing collapse in locally expansive mudstone. Journal of Petroleum Science and Engineering 2021, 203, 108643 .

AMA Style

Zhan-Feng Chen, Xu-Yao Li, Wen Wang, Ke-Qing Lu, Wei-Ping Zhu. Theoretical analysis of casing collapse in locally expansive mudstone. Journal of Petroleum Science and Engineering. 2021; 203 ():108643.

Chicago/Turabian Style

Zhan-Feng Chen; Xu-Yao Li; Wen Wang; Ke-Qing Lu; Wei-Ping Zhu. 2021. "Theoretical analysis of casing collapse in locally expansive mudstone." Journal of Petroleum Science and Engineering 203, no. : 108643.

Journal article
Published: 25 February 2021 in Aerospace Science and Technology
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Hydraulic control system is one of the fundamental subsystems of the various aircraft systems, e.g., flight control system, brake system and fuel regulation system. As a pivotal actuator of the hydraulic control system, the nozzle-flapper servo valve converts the control signals to the hydraulic output. The flow cavitation in the valves could lead to some intractable problems, e.g., vibration, noise and erosion, which could produce detrimental effects on the performance and reliability of the hydraulic system, even damage the aircraft. This work provides a numerical investigation on the cavitation attenuation in the nozzle-flapper valve using triangular nozzle exit. The flow imaging and mass flow rate measurement are conducted to qualitatively and quantitatively verify the numerical model, respectively. It is observed that the presence of the vapour phase is remarkably suppressed under the effect of the triangular nozzle exit. For both circular and triangular nozzle exits, the occurrence of the vapour phase is highly affected by the nozzle-to-flapper distance, inlet pressure and chamber diameter while the flapper diameter exerts an insignificant impact on the formation of the vapour phase. Compared with the circular nozzle exit, the triangular nozzle exit could effectively reduce the flow cavitation at the same geometry and inlet pressure. The physical mechanism behind the cavitation suppression may be ascribed to the generation of the inclined impinging jet upon the chamber wall and the wall jet without impingement.

ACS Style

He Yang; Yufan Xu; Zhanfeng Chen; Wen Wang; Nay Zar Aung; Songjing Li. Cavitation suppression in the nozzle-flapper valves of the aircraft hydraulic system using triangular nozzle exits. Aerospace Science and Technology 2021, 112, 106598 .

AMA Style

He Yang, Yufan Xu, Zhanfeng Chen, Wen Wang, Nay Zar Aung, Songjing Li. Cavitation suppression in the nozzle-flapper valves of the aircraft hydraulic system using triangular nozzle exits. Aerospace Science and Technology. 2021; 112 ():106598.

Chicago/Turabian Style

He Yang; Yufan Xu; Zhanfeng Chen; Wen Wang; Nay Zar Aung; Songjing Li. 2021. "Cavitation suppression in the nozzle-flapper valves of the aircraft hydraulic system using triangular nozzle exits." Aerospace Science and Technology 112, no. : 106598.

Journal article
Published: 16 January 2021 in Micromachines
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Piezoelectric actuators are widely used in micro- and nano-manufacturing and precision machining due to their superior performance. However, there are complex hysteresis nonlinear phenomena in piezoelectric actuators. In particular, the inherent hysteresis can be affected by the input frequency, and it sometimes exhibits asymmetrical characteristic. The existing dynamic hysteresis model is inaccurate in describing hysteresis of piezoelectric actuators at high frequency. In this paper, a Dynamic Delay Prandtl–Ishlinskii (DDPI) model is proposed to describe the asymmetrical and dynamic characteristics of piezoelectric actuators. First, the shape of the Delay Play operator is discussed under two delay coefficients. Then, the accuracy of the DDPI model is verified by experiments. Next, to compensate the asymmetrical and dynamic hysteresis, the compensator is designed based on the Inverse Dynamic Delay Prandtl–Ishlinskii (IDDPI) model. The effectiveness of the inverse compensator was verified by experiments. The results show that the DDPI model can accurately describe the asymmetrical and dynamic hysteresis, and the compensator can effectively suppress the hysteresis of the piezoelectric actuator. This research will be beneficial to extend the application of piezoelectric actuators.

ACS Style

Wen Wang; Fuming Han; Zhanfeng Chen; Ruijin Wang; Chuanyong Wang; Keqing Lu; Jiahui Wang; Bingfeng Ju. Modeling and Compensation for Asymmetrical and Dynamic Hysteresis of Piezoelectric Actuators Using a Dynamic Delay Prandtl–Ishlinskii Model. Micromachines 2021, 12, 92 .

AMA Style

Wen Wang, Fuming Han, Zhanfeng Chen, Ruijin Wang, Chuanyong Wang, Keqing Lu, Jiahui Wang, Bingfeng Ju. Modeling and Compensation for Asymmetrical and Dynamic Hysteresis of Piezoelectric Actuators Using a Dynamic Delay Prandtl–Ishlinskii Model. Micromachines. 2021; 12 (1):92.

Chicago/Turabian Style

Wen Wang; Fuming Han; Zhanfeng Chen; Ruijin Wang; Chuanyong Wang; Keqing Lu; Jiahui Wang; Bingfeng Ju. 2021. "Modeling and Compensation for Asymmetrical and Dynamic Hysteresis of Piezoelectric Actuators Using a Dynamic Delay Prandtl–Ishlinskii Model." Micromachines 12, no. 1: 92.

Journal article
Published: 03 September 2020 in Micromachines
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Spherical joints have attracted increasing interest in the engineering applications of machine tools, industrial robots, medical equipment, and so on. As one of the promising methods of detecting the micro-clearance in spherical joints, the measurement accuracy of a spherical capacitive sensor could be affected by imperfectness during the manufacturing and installation of the sensor. This work presents error analysis of a spherical capacitive sensor with a differential structure and explores the dependence of the differential capacitance on manufacturing and the installation imperfectness. Five error sources are examined: the shape of the ball and the capacitive plate, the axial and radial offset of the plate, and the inclined installation of the plate. The mathematical models for calculating the capacitance errors of the spherical capacitive sensor are deduced and validated through a simulation using Ansoft Maxwell. The results show that the measurement accuracy of the spherical capacitive sensor is significantly affected by the shape of plates and ball, the axial offset, and the inclined angle of the plate. In contrast, the effect of the radial offset of the plate is quite small.

ACS Style

Wen Wang; Wenjun Qiu; He Yang; Keqing Lu; Zhanfeng Chen; Bingfeng Ju. Error Analysis of a Spherical Capacitive Sensor for the Micro-Clearance Detection in Spherical Joints. Micromachines 2020, 11, 837 .

AMA Style

Wen Wang, Wenjun Qiu, He Yang, Keqing Lu, Zhanfeng Chen, Bingfeng Ju. Error Analysis of a Spherical Capacitive Sensor for the Micro-Clearance Detection in Spherical Joints. Micromachines. 2020; 11 (9):837.

Chicago/Turabian Style

Wen Wang; Wenjun Qiu; He Yang; Keqing Lu; Zhanfeng Chen; Bingfeng Ju. 2020. "Error Analysis of a Spherical Capacitive Sensor for the Micro-Clearance Detection in Spherical Joints." Micromachines 11, no. 9: 837.

Journal article
Published: 01 September 2020 in IEEE Access
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In order to power the microelectronic devices of the Internet of Things in the low-frequency broadband vibration environment, a novel nonlinear 2DOF electromagnetic energy harvester was proposed based on the magnetic levitation structure and velocity amplification mechanism. The electromechanical coupling model was established and numerically simulated to analyze the generating characteristics. A prototype was fabricated and tested to verify the theoretical model. The influences of the key parameters, including the gap between the suspended magnet and the lower spring, excitation acceleration, spring stiffness, mass of copper cylinder, on the generating characteristics were studied. When it was subjected to a harmonic excitation with acceleration amplitude of 0.8g, the measured open-circuit voltage reached peaks of 3.13 V at 8 Hz and 2.93 V at 13.5 Hz, respectively. The optimal output power at 8 Hz was 10.18 mW with the matched load resistance of 250 Ω. Both the experimental and theoretical results demonstrated that this novel electromagnetic energy harvester had obvious advantages in increasing the output power and widening the bandwidth.

ACS Style

Ruiqi Liu; Zhenlong Xu; Yuanfan Jin; Wen Wang. Design and Research on a Nonlinear 2DOF Electromagnetic Energy Harvester With Velocity Amplification. IEEE Access 2020, 8, 159947 -159955.

AMA Style

Ruiqi Liu, Zhenlong Xu, Yuanfan Jin, Wen Wang. Design and Research on a Nonlinear 2DOF Electromagnetic Energy Harvester With Velocity Amplification. IEEE Access. 2020; 8 (99):159947-159955.

Chicago/Turabian Style

Ruiqi Liu; Zhenlong Xu; Yuanfan Jin; Wen Wang. 2020. "Design and Research on a Nonlinear 2DOF Electromagnetic Energy Harvester With Velocity Amplification." IEEE Access 8, no. 99: 159947-159955.

Journal article
Published: 28 July 2020 in International Journal of Hydrogen Energy
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Low temperature and high pressure line pipes are widely used in hydrogen storage, air separation plant, liquefied natural gas (LNG) transportation etc. The material properties of pipes at low temperature are different from those at room temperature. If the medium in the pipe is corrosive, it will cause the pipe wall thickness to decrease. However, the failure pressure of the corroded hydrogen storage pipeline at extremely low temperature is lacking of adequate understanding. In this paper, we provided a novel failure pressure equation of the mild steel line pipe with corrosion defects at extremely low temperature. Firstly, a mechanical model of the line pipe with corrosion defects is established. And then, an analytical solution of the mechanical model is obtained based on elastic theory. Next, a failure pressure equation of the corroded hydrogen storage pipeline at extremely low temperature is developed. In the end, the accuracy of the failure pressure equation is verified by comparing with finite element method (FEM). The results suggest that the calculated value of the failure pressure equation is consistent with that of FEM. This paper provides a theoretical basis for the safety assessment of low temperature hydrogen storage pipeline. The new equation presented in this paper can provide useful guidance for the design of low temperature and high pressure pipelines.

ACS Style

Zhanfeng Chen; Yipeng Chen; Wen Wang; Keqing Lu; He Yang; Weiping Zhu. Failure pressure analysis of hydrogen storage pipeline under low temperature and high pressure. International Journal of Hydrogen Energy 2020, 45, 23142 -23150.

AMA Style

Zhanfeng Chen, Yipeng Chen, Wen Wang, Keqing Lu, He Yang, Weiping Zhu. Failure pressure analysis of hydrogen storage pipeline under low temperature and high pressure. International Journal of Hydrogen Energy. 2020; 45 (43):23142-23150.

Chicago/Turabian Style

Zhanfeng Chen; Yipeng Chen; Wen Wang; Keqing Lu; He Yang; Weiping Zhu. 2020. "Failure pressure analysis of hydrogen storage pipeline under low temperature and high pressure." International Journal of Hydrogen Energy 45, no. 43: 23142-23150.

Journal article
Published: 29 April 2020 in Applied Sciences
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Existing scanning laser three-dimensional (3D) imaging technology has slow measurement speed. In addition, the measurement accuracy of non-scanning laser 3D imaging technology based on area array detectors is limited by the resolution and response frequency of area array detectors. As a result, applications of laser 3D imaging technology are limited. This paper completed simulations and experiments of a non-scanning 3D imaging system with a single-pixel detector. The single-pixel detector can be used to achieve 3D imaging of a target by compressed sensing to overcome the shortcomings of the existing laser 3D imaging technology. First, the effects of different sampling rates, sparse transform bases, measurement matrices, and reconstruction algorithms on the measurement results were compared through simulation experiments. Second, a non-scanning 3D imaging experimental platform was designed and constructed. Finally, an experiment was performed to compare the effects of different sampling rates and reconstruction algorithms on the reconstruction effect of 3D imaging to obtain a 3D image with a resolution of 8 × 8. The simulation results show that the reconstruction effect of the Hadamard measurement matrix and the minimum total variation reconstruction algorithm performed well.

ACS Style

Guang Shi; Leijue Zheng; Wen Wang; Keqing Lu. Non-Scanning Three-Dimensional Imaging System with a Single-Pixel Detector: Simulation and Experimental Study. Applied Sciences 2020, 10, 3100 .

AMA Style

Guang Shi, Leijue Zheng, Wen Wang, Keqing Lu. Non-Scanning Three-Dimensional Imaging System with a Single-Pixel Detector: Simulation and Experimental Study. Applied Sciences. 2020; 10 (9):3100.

Chicago/Turabian Style

Guang Shi; Leijue Zheng; Wen Wang; Keqing Lu. 2020. "Non-Scanning Three-Dimensional Imaging System with a Single-Pixel Detector: Simulation and Experimental Study." Applied Sciences 10, no. 9: 3100.

Journal article
Published: 30 March 2020 in Micromachines
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Because of fast frequency response, high stiffness, and displacement resolution, the piezoelectric actuators (PEAs) are widely used in micro/nano driving field. However, the hysteresis nonlinearity behavior of the PEAs affects seriously the further improvement of manufacturing accuracy. In this paper, we focus on the modeling of asymmetric hysteresis behavior and compensation of PEAs. First, a polynomial-modified Prandtl-Ishlinskii (PMPI) model is proposed for the asymmetric hysteresis behavior. Compared with classical Prandtl-Ishlinskii (PI) model, the PMPI model can be used to describe both symmetric and asymmetric hysteresis. Then, the congruency property of PMPI model is analyzed and verified. Next, based on the PMPI model, the inverse model (I-M) compensator is designed for hysteresis compensation. The stability of the I-M compensator is analyzed. Finally, the simulation and experiment are carried out to verify the accuracy of the PMPI model and the I-M compensator. The results implied that the PMPI model can effectively describe the asymmetric hysteresis, and the I-M compensator can well suppress the hysteresis characteristics of PEAs.

ACS Style

Wen Wang; Jian Wang; Zhanfeng Chen; Ruijin Wang; Keqing Lu; Zhiqian Sang; Bingfeng Ju. Research on Asymmetric Hysteresis Modeling and Compensation of Piezoelectric Actuators with PMPI Model. Micromachines 2020, 11, 357 .

AMA Style

Wen Wang, Jian Wang, Zhanfeng Chen, Ruijin Wang, Keqing Lu, Zhiqian Sang, Bingfeng Ju. Research on Asymmetric Hysteresis Modeling and Compensation of Piezoelectric Actuators with PMPI Model. Micromachines. 2020; 11 (4):357.

Chicago/Turabian Style

Wen Wang; Jian Wang; Zhanfeng Chen; Ruijin Wang; Keqing Lu; Zhiqian Sang; Bingfeng Ju. 2020. "Research on Asymmetric Hysteresis Modeling and Compensation of Piezoelectric Actuators with PMPI Model." Micromachines 11, no. 4: 357.

Original article
Published: 18 March 2020 in The International Journal of Advanced Manufacturing Technology
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Geometric error measurement is crucial for error compensation and machining accuracy of CNC machine tools. However, traditional double-ball bar (DBB) method cannot be used for full-scale measurement of geometric errors due to the constant length of bars. In this paper, a full-scale measurement of geometric errors for CNC machine tools with high efficiency is carried out based on the double ball bar with a ball joint (J-DBB) method. Firstly, the principle of J-DBB is introduced. The J-DBB can be used for a full-scale measurement thanks to its freely measuring radius. Then, the equations of geometric errors which include squareness error, straightness error, roll error, pitch error, and yaw error of the axes are theoretically analyzed. In the end, we compared the theoretical trajectories of circular interpolation with the actual ones. The geometric errors between theoretical trajectories and actual ones can be measured and shown by J-DBB method. The results revealed that the J-DBB can be applied to conduct the full-scale measurement of geometric errors in CNC machine tools. Besides, the measurement range of geometric errors is extended from a two-dimensional circle to a three-dimensional sphere with a radius of 0.259L to 2L.

ACS Style

Wen Wang; Zhanfeng Chen; Yewen Zhu; He Yang; Keqing Lu; Guang Shi; Kui Xiang; Bingfeng Ju. Full-scale measurement of CNC machine tools. The International Journal of Advanced Manufacturing Technology 2020, 107, 2291 -2301.

AMA Style

Wen Wang, Zhanfeng Chen, Yewen Zhu, He Yang, Keqing Lu, Guang Shi, Kui Xiang, Bingfeng Ju. Full-scale measurement of CNC machine tools. The International Journal of Advanced Manufacturing Technology. 2020; 107 (5-6):2291-2301.

Chicago/Turabian Style

Wen Wang; Zhanfeng Chen; Yewen Zhu; He Yang; Keqing Lu; Guang Shi; Kui Xiang; Bingfeng Ju. 2020. "Full-scale measurement of CNC machine tools." The International Journal of Advanced Manufacturing Technology 107, no. 5-6: 2291-2301.

Accepted manuscript
Published: 22 October 2019 in Measurement Science and Technology
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Distance measurement using frequency sweeping interferometry (FSI) is an absolute distance measurement technique that allows for high accuracy over long distances. Notwithstanding, the measurement accuracy is affected by laser sweeping nonlinearity and limited sweeping range. In this work, an optimized post-processing linearization method is demonstrated to realize high accuracy arbitrary distance measurement using a laser with small modulation range. The interference signal is sparsely resampled to eliminate the influence of the sweeping nonlinearity, and the absolute distance is obtained by analyzing the phase of the resampled signal. In the measurement system, a high finesse Fabry-Perot (F-P) cavity placed in vacuum is used as the measurement reference, so the effect of dispersion mismatch is negligible. Moreover, the distance measurement result is determined by the linear fit of the phase of each resampled point. Therefore, the influence of target vibration and other external random noise can be partially eliminated, and the reliability of the result is high. In the experiment, the sweeping range of the laser source is only 88 GHz. Comparing with a fringe counting interferometer, the standard deviation of the residual errors is 34 μm within a distance of 6.7 m.

ACS Style

Guang Shi; Kefei Hei; Wen Wang; Nandini Bhattacharya. High-precision frequency sweeping interferometry for absolute distance measurement using a tunable laser with sweeping range of 88 GHz. Measurement Science and Technology 2019, 31, 045201 .

AMA Style

Guang Shi, Kefei Hei, Wen Wang, Nandini Bhattacharya. High-precision frequency sweeping interferometry for absolute distance measurement using a tunable laser with sweeping range of 88 GHz. Measurement Science and Technology. 2019; 31 (4):045201.

Chicago/Turabian Style

Guang Shi; Kefei Hei; Wen Wang; Nandini Bhattacharya. 2019. "High-precision frequency sweeping interferometry for absolute distance measurement using a tunable laser with sweeping range of 88 GHz." Measurement Science and Technology 31, no. 4: 045201.

Journal article
Published: 20 July 2019 in Sensors
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The approach to improve the output power of piezoelectric energy harvester is one of the current research hotspots. In the case where some sources have two or more discrete vibration frequencies, this paper proposed three types of magnetically coupled multi-frequency hybrid energy harvesters (MHEHs) to capture vibration energy composed of two discrete frequencies. Electromechanical coupling models were established to analyze the magnetic forces, and to evaluate the power generation characteristics, which were verified by the experimental test. The optimal structure was selected through the comparison. With 2 m/s2 excitation acceleration, the optimal peak output power was 2.96 mW at 23.6 Hz and 4.76 mW at 32.8 Hz, respectively. The superiority of hybrid energy harvesting mechanism was demonstrated. The influences of initial center-to-center distances between two magnets and length of cantilever beam on output power were also studied. At last, the frequency sweep test was conducted. Both theoretical and experimental analyses indicated that the proposed MHEH produced more electric power over a larger operating bandwidth.

ACS Style

Zhenlong Xu; Hong Yang; Hao Zhang; Huawei Ci; Maoying Zhou; Wen Wang; Aihua Meng. Design and Analysis of a Magnetically Coupled Multi-Frequency Hybrid Energy Harvester. Sensors 2019, 19, 3203 .

AMA Style

Zhenlong Xu, Hong Yang, Hao Zhang, Huawei Ci, Maoying Zhou, Wen Wang, Aihua Meng. Design and Analysis of a Magnetically Coupled Multi-Frequency Hybrid Energy Harvester. Sensors. 2019; 19 (14):3203.

Chicago/Turabian Style

Zhenlong Xu; Hong Yang; Hao Zhang; Huawei Ci; Maoying Zhou; Wen Wang; Aihua Meng. 2019. "Design and Analysis of a Magnetically Coupled Multi-Frequency Hybrid Energy Harvester." Sensors 19, no. 14: 3203.

Journal article
Published: 14 June 2019 in Sensors
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Due to the flexible and compact structures, spherical joints are widely used in parallel manipulators and industrial robots. Real-time detection of the clearance between the ball and the socket in spherical joints is beneficial to compensate motion errors of mechanical systems and improve their transmission accuracy. This work proposes an improved capacitive sensor for detecting the micro-clearance of spherical joints. First, the structure of the capacitive sensor is proposed. Then, the mathematical model for the differential capacitance of the sensor and the eccentric micro-displacement of the ball is deduced. Finally, the capacitance values of the capacitive sensor are simulated with Ansoft Maxwell. The simulated values of the differential capacitances at different eccentric displacements agree well with the theoretical ones, indicating the feasibility of the proposed detection method. In addition, the simulated results show that the proposed capacitive sensor could effectively reduce the capacitive fringe effect, improving the measurement accuracy.

ACS Style

Wen Wang; Wenjun Qiu; He Yang; Haimei Wu; Guang Shi; Zhanfeng Chen; Keqing Lu; Kui Xiang; Bingfeng Ju. An Improved Capacitive Sensor for Detecting the Micro-Clearance of Spherical Joints. Sensors 2019, 19, 2694 .

AMA Style

Wen Wang, Wenjun Qiu, He Yang, Haimei Wu, Guang Shi, Zhanfeng Chen, Keqing Lu, Kui Xiang, Bingfeng Ju. An Improved Capacitive Sensor for Detecting the Micro-Clearance of Spherical Joints. Sensors. 2019; 19 (12):2694.

Chicago/Turabian Style

Wen Wang; Wenjun Qiu; He Yang; Haimei Wu; Guang Shi; Zhanfeng Chen; Keqing Lu; Kui Xiang; Bingfeng Ju. 2019. "An Improved Capacitive Sensor for Detecting the Micro-Clearance of Spherical Joints." Sensors 19, no. 12: 2694.

Research article
Published: 20 May 2019 in Advances in Mechanical Engineering
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Electro-hydraulic servo-valves play key roles in modern electro-hydraulic power systems in many industrial applications. As one of the widely used hydraulic servo-valves, cavitation in the flapper-nozzle servo-valve could produce deleterious effects of noise, flapper vibration and cavitation erosion. In this work, a numerical investigation has been conducted on the manipulation of the flapper-nozzle pilot valve using continuous minijets. Two minijets are symmetrically deployed around the main jet of each nozzle. Vapor fraction and flow forces under the effect of the continuous minijets are compared in detail between the traditional nozzle and the nozzle with the minijets. It is found that cavitation in the flapper-nozzle stage is greatly weakened under the effect of the continuous minijets. The remarkable drop in the radial jet velocity results in the suppression of the swirling structures in the annulus, which may be responsible for the cavitation reduction. The variation trend of the flow forces with the inlet pressure remains unchanged while the magnitude of the flow forces is varied slightly, depending on the various surfaces of the flapper.

ACS Style

He Yang; Wen Wang; Keqing Lu. Cavitation and flow forces in the flapper-nozzle stage of a hydraulic servo-valve manipulated by continuous minijets. Advances in Mechanical Engineering 2019, 11, 1 .

AMA Style

He Yang, Wen Wang, Keqing Lu. Cavitation and flow forces in the flapper-nozzle stage of a hydraulic servo-valve manipulated by continuous minijets. Advances in Mechanical Engineering. 2019; 11 (5):1.

Chicago/Turabian Style

He Yang; Wen Wang; Keqing Lu. 2019. "Cavitation and flow forces in the flapper-nozzle stage of a hydraulic servo-valve manipulated by continuous minijets." Advances in Mechanical Engineering 11, no. 5: 1.

Journal article
Published: 26 April 2019 in Micromachines
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Precision spherical joints are commonly employed as multiple degree-of-freedom (DOF) mechanical hinges in many engineering applications, e.g., robots and parallel manipulators. Real-time and precise measurement of the rotational angles of spherical joints is not only beneficial to the real-time and closed-loop control of mechanical transmission systems, but also is of great significance in the prediction and compensation of their motion errors. This work presents a novel approach for rotational angle measurement of spherical joints with a capacitive sensor. First, the 3-DOF angular motions of a spherical joint were analyzed. Then, the structure of the proposed capacitive sensor was presented, and the mathematical model for the rotational angles of a spherical joint and the capacitance of the capacitors was deduced. Finally, the capacitance values of the capacitors at different rotations were simulated using Ansoft Maxwell software. The simulation results show that the variation in the simulated capacitance values of the capacitors is similar to that of the theoretical values, suggesting the feasibility and effectiveness of the proposed capacitive detection method for rotational angles of spherical joints.

ACS Style

Wen Wang; He Yang; Min Zhang; Zhanfeng Chen; Guang Shi; Keqing Lu; Kui Xiang; Bingfeng Ju. A Novel Approach for Detecting Rotational Angles of a Precision Spherical Joint Based on a Capacitive Sensor. Micromachines 2019, 10, 280 .

AMA Style

Wen Wang, He Yang, Min Zhang, Zhanfeng Chen, Guang Shi, Keqing Lu, Kui Xiang, Bingfeng Ju. A Novel Approach for Detecting Rotational Angles of a Precision Spherical Joint Based on a Capacitive Sensor. Micromachines. 2019; 10 (5):280.

Chicago/Turabian Style

Wen Wang; He Yang; Min Zhang; Zhanfeng Chen; Guang Shi; Keqing Lu; Kui Xiang; Bingfeng Ju. 2019. "A Novel Approach for Detecting Rotational Angles of a Precision Spherical Joint Based on a Capacitive Sensor." Micromachines 10, no. 5: 280.

Journal article
Published: 01 March 2019 in AIP Advances
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ACS Style

Maoying Zhou; Qinzhong Chen; Zhenlong Xu; Wen Wang. Piezoelectric wind energy harvesting device based on the inverted cantilever beam with leaf-inspired extensions. AIP Advances 2019, 9, 035213 .

AMA Style

Maoying Zhou, Qinzhong Chen, Zhenlong Xu, Wen Wang. Piezoelectric wind energy harvesting device based on the inverted cantilever beam with leaf-inspired extensions. AIP Advances. 2019; 9 (3):035213.

Chicago/Turabian Style

Maoying Zhou; Qinzhong Chen; Zhenlong Xu; Wen Wang. 2019. "Piezoelectric wind energy harvesting device based on the inverted cantilever beam with leaf-inspired extensions." AIP Advances 9, no. 3: 035213.

Journal article
Published: 09 January 2019 in International Journal of Heat and Mass Transfer
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The flow cavitation in the flapper-nozzle stage is one of the main factors that produce the flapper vibration and thus deteriorate the performance of the flapper-nozzle servo valves. This work proposes a novel method, deploying two continuous microjets around the main jet of each nozzle, to suppress the cavitation. The cavitation reduction using continuous microjets is numerically examined in detail by comparing the vapor fraction with and without the microjets at different inlet pressure, housing diameter and the null clearance. The mass flow rate measurements and the flow visualization are conducted to validate the numerical simulation. It is found that the cavitation in the flapper-nozzle stage is significantly reduced under the effect of the continuous microjets. And the flow cavitation exhibits a great dependence on the inlet pressure, housing diameter and the null clearance. In the traditional flapper-nozzle structure, the cavitation is strongly enhanced at high inlet pressure, small housing diameter or large null clearance. Nevertheless, the cavitation in the flapper-nozzle structure with the microjets is still remarkably suppressed at the same condition. This indicates that the continuous microjets are highly effective in reducing the cavitation of the flapper-nozzle valve.

ACS Style

He Yang; Wen Wang; Keqing Lu; Zhanfeng Chen. Cavitation reduction of a flapper-nozzle pilot valve using continuous microjets. International Journal of Heat and Mass Transfer 2019, 133, 1099 -1109.

AMA Style

He Yang, Wen Wang, Keqing Lu, Zhanfeng Chen. Cavitation reduction of a flapper-nozzle pilot valve using continuous microjets. International Journal of Heat and Mass Transfer. 2019; 133 ():1099-1109.

Chicago/Turabian Style

He Yang; Wen Wang; Keqing Lu; Zhanfeng Chen. 2019. "Cavitation reduction of a flapper-nozzle pilot valve using continuous microjets." International Journal of Heat and Mass Transfer 133, no. : 1099-1109.

Journal article
Published: 09 October 2018 in Sensors
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A spherical joint is a commonly used mechanical hinge with the advantages of compact structure and good flexibility, and it becomes a key component in many types of equipment, such as parallel mechanisms, industrial robots, and automobiles. Real-time detection of a precision spherical joint clearance is of great significance in analyzing the motion errors of mechanical systems and improving the transmission accuracy. This paper presents a novel method for the micro-clearance measurement with a spherical differential capacitive sensor (SDCS). First, the structure and layout of the spherical capacitive plates were designed according to the measuring principle of capacitive sensors with spacing variation. Then, the mathematical model for the spatial eccentric displacements of the ball and the differential capacitance was established. In addition, equipotential guard rings were used to attenuate the fringe effect on the measurement accuracy. Finally, a simulation with Ansoft Maxwell software was carried out to calculate the capacitance values of the spherical capacitors at different eccentric displacements. Simulation results indicated that the proposed method based on SDCS was feasible and effective for the micro-clearance measurement of the precision spherical joints with small eccentricity.

ACS Style

Wen Wang; He Yang; Min Zhang; Zhanfeng Chen; Guang Shi; Keqing Lu; Kui Xiang; Bingfeng Ju. A Novel Method for the Micro-Clearance Measurement of a Precision Spherical Joint Based on a Spherical Differential Capacitive Sensor. Sensors 2018, 18, 3366 .

AMA Style

Wen Wang, He Yang, Min Zhang, Zhanfeng Chen, Guang Shi, Keqing Lu, Kui Xiang, Bingfeng Ju. A Novel Method for the Micro-Clearance Measurement of a Precision Spherical Joint Based on a Spherical Differential Capacitive Sensor. Sensors. 2018; 18 (10):3366.

Chicago/Turabian Style

Wen Wang; He Yang; Min Zhang; Zhanfeng Chen; Guang Shi; Keqing Lu; Kui Xiang; Bingfeng Ju. 2018. "A Novel Method for the Micro-Clearance Measurement of a Precision Spherical Joint Based on a Spherical Differential Capacitive Sensor." Sensors 18, no. 10: 3366.

Research article
Published: 15 July 2018 in Mathematical Problems in Engineering
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Kinematic parameters identification and compensation are effective ways to improve the accuracy of articulated arm coordinate measuring machines (AACMMs) and robotic arms without increasing the cost of hardware. Generally, kinematic parameters identification methods based on standard references are relatively high in accuracy but time-consuming and not suitable for industrial sites, while kinematic parameters identification methods based on repeatability are flexible and easy to implement but lack reliability in accuracy. A novel kinematic parameters identification method for AACMMs using repeatability and scaling factor is proposed in this paper, which combines the advantages of methods based on both standard references and repeatability. Through theoretical analysis and numerical simulations, we found that the commonly used single-point-repeatability-based identification method has problems in identifying the length parameters, which is due to that high repeatability cannot guarantee the accuracy of the kinematic parameters and the measurement accuracy of the AACMM. Further analysis showed that the error of the length parameters is determined by a scaling factor which can be used to remove the error of length parameters. Therefore, a two-step novel kinematic parameters identification method for the AACMMs using repeatability and scaling factor was proposed to get accurate parameters with convenient operation. Experimental studies showed the effectiveness of the proposed identification method, which indicated that 93% more error in spatial length can be decreased comparing to the traditional method of repeatability-based identification.

ACS Style

Lin Cheng; Wen Wang; Yixin Weng; Guang Shi; He Yang; Keqing Lu. A Novel Kinematic Parameters Identification Method for Articulated Arm Coordinate Measuring Machines Using Repeatability and Scaling Factor. Mathematical Problems in Engineering 2018, 2018, 1 -10.

AMA Style

Lin Cheng, Wen Wang, Yixin Weng, Guang Shi, He Yang, Keqing Lu. A Novel Kinematic Parameters Identification Method for Articulated Arm Coordinate Measuring Machines Using Repeatability and Scaling Factor. Mathematical Problems in Engineering. 2018; 2018 ():1-10.

Chicago/Turabian Style

Lin Cheng; Wen Wang; Yixin Weng; Guang Shi; He Yang; Keqing Lu. 2018. "A Novel Kinematic Parameters Identification Method for Articulated Arm Coordinate Measuring Machines Using Repeatability and Scaling Factor." Mathematical Problems in Engineering 2018, no. : 1-10.