车辆整备状态车体垂弯频率优化方法研究

摘要

The sensitivity analysis and design of flexible suspension parameters of hanging devices were proposed to improve the first order vertical bending frequency of the fully equipped car bodies.The vertical bending frequency was optimally designed with the thickness of body frame as design variables based on the modal sensitivity analysis theory.The influence of suspended forms and rigidity of rubber on the first vertical bending frequency was analyzed.The results show that the first vertical bending frequency of the car body can be changed from 9.70 Hz to 10.60 Hz while the mass of car body was increased by 0.93 t.The first vertical bending frequency of FE models of fully equipped car bodies was enhanced to 10.51 Hz by adopting the method of flexible suspension while the mass of the car body was constant.In contrast with the sensitivity analysis,the design of flexible suspension parameters of hanging devices is easier for engineering application and the mass of car body is constant.%为提高轨道车辆整备状态车体垂向一阶弯曲频率,提出基于灵敏度分析和车下设备弹性吊挂参数设计方法优化车体垂向一阶弯曲频率.以车身型材骨架厚度为设计变量,用模态灵敏度理论对车体垂弯进行优化设计;结合改进车下设备与车体连接方式,研究了不同吊挂形式及刚度对车体垂向弯曲频率的影响.研究结果表明:采用灵敏度分析调整车体敏感部件厚度后,车体垂向一阶弯曲频率由9.70 Hz提升至10.60 Hz,但车体质量相应增加0.93 t;而采用基于车下设备弹性吊挂参数设计的方法,设置下吊设备固有频率为7 Hz时,整备状态车体的垂向一阶弯曲模态频率提升至10.51 Hz,相对而言基于弹性吊挂参数设计的方法更易于实际工程应用且不增加车体结构质量.