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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.
The improvement of sound absorption performance of porous metal is a focus of research in the field of noise reduction. Influences of compression ratios on sound absorption performance of a porous nickel–iron (Ni–Fe) alloy were investigated. The samples were compressed with ratios from 10% to 80% at an interval of 10%. Based on the standing wave method, sound absorption coefficients of compressed samples with different thicknesses were obtained. It could be found that with the same compression ratio, sound absorption performance was improved with the increase of thickness. Based on the modified Johnson–Allard model with a correction factor, the sound absorption coefficient of the porous Ni–Fe with a thickness of 20 mm for different compression ratios was derived, whose aim was to quantificationally analyze influences of the compression ratio. The results indicated that the sample with a compression ratio of 70% exhibited optimal sound absorption performance, and its average sound absorption coefficient reached 88.97% in a frequency range of 1000–6000 Hz. Meanwhile, the section morphologies of compressed samples were investigated by a scanning electron microscope, which studied the sound absorption performance by analyzing structures of the porous Ni–Fe samples with different compression ratios. The obtained achievements will promote the application of the porous Ni–Fe alloy in the field of acoustics.
Panfeng Bai; Xinmin Shen; Xiaonan Zhang; Xiaocui Yang; Qin Yin; Anxin Liu. Influences of Compression Ratios on Sound Absorption Performance of Porous Nickel–Iron Alloy. Metals 2018, 8, 539 .
AMA StylePanfeng Bai, Xinmin Shen, Xiaonan Zhang, Xiaocui Yang, Qin Yin, Anxin Liu. Influences of Compression Ratios on Sound Absorption Performance of Porous Nickel–Iron Alloy. Metals. 2018; 8 (7):539.
Chicago/Turabian StylePanfeng Bai; Xinmin Shen; Xiaonan Zhang; Xiaocui Yang; Qin Yin; Anxin Liu. 2018. "Influences of Compression Ratios on Sound Absorption Performance of Porous Nickel–Iron Alloy." Metals 8, no. 7: 539.