物流车座椅减振器双向比对人-椅冲击动力学行为的影响
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摘要
为探明减振器双向比对人-椅系统冲击动力学行为的影响规律,基于台架试验将座椅减振器阻尼特性简化为非对称分段线性函数,进而创建了人-椅非线性动力学模型及方程,并通过座椅台架试验验证了其有效性.以典型脉冲输入模拟座椅受到的垂向冲击,对不同强度脉冲激励工况、不同减振器双向比情况下的人-椅冲击动力学行为进行数值仿真.结果表明,当座椅减振器双向比大于1时,更有利于衰减驾驶室地板传递到驾乘人员的冲击;而且冲击输入强度越大,座椅减振器双向比大于1时的相对隔振效果越好.
To ascertain the damper bidirectional ratio effect on the impact dynamic behavior of the human-seat system,the most widely used X-type seat is taken as the research object. Based on the measured data by the damper bench,the damper damping characteristic of the seat is simplified as an asymmetric piecewise linear function. A nonlinear dynamic model for the human-seat was proposed and its equation was created and validated by seat test. Based on the model and the equation,taking a typical pulse with different intensity as inputs, numerical simulations were carried out under different bidirectional ratios. It is shown that when the seat damper bidirectional ratio is larger than 1,it becomes more conducive to attenuate the impact on drivers,and the greater the impact input intensity is,the better the relative isolation effect is.
To ascertain the damper bidirectional ratio effect on the impact dynamic behavior of the human-seat system,the most widely used X-type seat is taken as the research object. Based on the measured data by the damper bench,the damper damping characteristic of the seat is simplified as an asymmetric piecewise linear function. A nonlinear dynamic model for the human-seat was proposed and its equation was created and validated by seat test. Based on the model and the equation,taking a typical pulse with different intensity as inputs, numerical simulations were carried out under different bidirectional ratios. It is shown that when the seat damper bidirectional ratio is larger than 1,it becomes more conducive to attenuate the impact on drivers,and the greater the impact input intensity is,the better the relative isolation effect is.
引文
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[11] Zhao L L,Yang F X,Yu Y W,et al. Influence ofshock absorber asymmetry on vibration responses of seat-occupant system under impact condition[C]∥2017 In-ternational Conference on Modelling,Identification andControl(ICMIC 2017). New York:IEEE Press,2017:394-399.
[12]长春汽车研究所. QC/T 545—1999.汽车筒式减振器台架试验方法[S]. 1999.
[2] Zhou Zhen,Griffin M J. Response of the seated humanbody to whole-body vertical vibration,discomfort causedby sinusoidal vibration[J]. Ergonomics,2014,57(5):714-732.
[3] Deboli R,Calvo A,Preti C. Whole-body vibration:measurement of horizontal and vertical transmissibility ofan agricultural tractor seat[J]. International Journal ofIndustrial Ergonomics,2017,58:69-78.
[4]周长城,潘礼军,于曰伟,等.车辆钢板弹簧悬架系统减振器最佳阻尼匹配[J].农业工程学报,2016,32(7):106-113.Zhou Changcheng,Pan Lijun,Yu Yuewei,et al. Opti-mal damping matching for shock absorber of vehicle leafspring suspension system[J]. Transactions of the ChineseSociety of Agricultural Engineering,2016,32(7):106-113.
[5] Tufano S,Griffin M J. Nonlinearity in the vertical trans-missibility of seating:the role of the human driver appar-ent mass and seat dynamic stiffness[J]. Vehicle SystemDynamics,2013,51(1):122-138.
[6] Ksiazek M A,Ziemianski D. Optimal driver seat suspen-sion for a hybrid model of sitting human body[J]. Journalof Terramechanics,2012,49(5):255-261.
[7] Zhao Leilei,Zhou Changcheng,Yu Yuewei,et al. Hy-brid modelling and damping collaborative optimisation offive-suspensions for coupling driver-seat-cab system[J].Vehicle System Dynamics,2016,54(5):667-688.
[8] Rajalingham C, Rakheja S. Influence of suspensiondamper asymmetry on vehicle vibration response to groundexcitation[J]. Journal of Sound and Vibration,2003,266(5):1117-1129.
[9] Silveira M,Jr Pontes B R,Balthazar J M. Use of nonlin-ear asymmetrical shock absorber to improve comfort onpassenger vehicles[J]. Journal of Sound and Vibration,2014,333(7):2114-2129.
[10] Silveira M,Wahi P,Fernandes J C M. Effects of asym-metrical damping on a 2 DOF quarter-car model underharmonic excitation[J]. Communications in NonlinearScience and Numerical Simulation,2017,43:14-24.
[11] Zhao L L,Yang F X,Yu Y W,et al. Influence ofshock absorber asymmetry on vibration responses of seat-occupant system under impact condition[C]∥2017 In-ternational Conference on Modelling,Identification andControl(ICMIC 2017). New York:IEEE Press,2017:394-399.
[12]长春汽车研究所. QC/T 545—1999.汽车筒式减振器台架试验方法[S]. 1999.