Effects of Modal Parameters on Ride Comfort Index under Harmonic Excitation
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摘要: 用模态坐标变换法推导了用模态参数描述的车辆垂向平稳性指标计算表达式.以二系悬挂15自由度铁道车辆悬挂系统为例,研究了车辆系统模态参数(模态频率和模态振型)对车辆垂向平稳性指标的影响.研究表明,车体模态频率对车辆的平稳性指标的影响最为明显,不同阶的模态阻尼比对平稳性指标的影响存在较大差异,一阶阻尼比对平稳性指标的影响较二阶阻尼比影响大.Abstract: An expression of the vertical ride comfort index of rail vehicles was derived by modal coordinate transform and described by modal parameters.The effects of modal parameters,i.e.modal frequency and mode,on the ride comfort index were studied by taking a secondary suspension system of a railway vehicle with 15-DOFs as an example.The research indicates that the comfort index is affected greatly by the modal frequencies of the vehicle body,different modal damping ratios have obvious different effects,and the effect of the first order modal damping ratio is greater than that of the second order modal damping ratio is.
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Key words:
- modal parameter /
- ride comfort index /
- rail vehicle /
- damping ratio
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