滑槽吊装方式在高速列车轻量化设计中存在明显优势,基于有限元法,建立滑槽吊装下车体-设备耦合振动分析模型,其中车体部分考虑型材厚度采用壳单元建模,而吊装部分将减振器等效为考虑刚度和阻尼特性的弹簧单元,通过谐响应分析计算单位力下车体振动响应作为中间结果.基于间接边界元法建立车体声辐射仿真分析模型,且考虑牵引变压器实际负载工况下的工频谐波激励影响,利用映射后的车体法向振动速度计算牵引变压器上方车体的辐射声功率级,根据声辐射仿真结果进一步探究悬挂刚度和阻尼比对车体辐射声功率的影响.结果表明:滑槽吊装下车体辐射声功率级在 350 Hz工频处最为突出,悬挂刚度对其影响较小,悬挂阻尼比影响较大,且车体辐射声功率级随着悬挂阻尼比的增加而增大.
The chute hoisting method has obvious advantages in the lightweight design of high-speed train.On the basis of the finite element method,the coupled vibration analysis model of the vehicle body and equipment under the chute hoisting is established.In the part of the vehicle body,the shell element is used for modeling considering the thickness of the profile,and in the hoisting part,the shock absorber is equivalent to the spring element considering the stiffness and damping characteristics.The vibration response of the vehicle body under unit force is calculated by harmonic response analysis as the intermediate result.The vehicle body acoustic radiation simulation analysis model is established based on the indirect boundary element method,and considering the influence of the power frequency harmonic excitation under the actual load condition of the traction transformer,the mapped normal vibration velocity of the vehicle body is used to calculate the radiant sound power level of the vehicle body above the traction transformer,and the influence of the suspension stiffness and damping ratio on the vehicle body radiant sound power is further explored according to the simulation results of acoustic radiation.The results show that the radiant sound power level of the vehicle body is most prominent at the power frequency of 350 Hz when the chute is hoisted,and the influence of the suspension stiffness is small,while the influence of the suspension damping ratio is large,and the radiant sound power level of the vehicle body increases with the increase of the suspension damping ratio.