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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.
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 StyleLei 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 StyleLei 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.
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.
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 StyleXiaocui 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 StyleXiaocui 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.