电驱动力总成悬置系统高频结构噪声控制是电动汽车噪声、振动和声振粗糙度(noise,vibration and harshness,简称NVH)开发与研究的重要内容,悬置动特性试验因设备技术更新换代而大幅提升测试频率上限至3 kHz。以某电动汽车橡胶悬置为研...电驱动力总成悬置系统高频结构噪声控制是电动汽车噪声、振动和声振粗糙度(noise,vibration and harshness,简称NVH)开发与研究的重要内容,悬置动特性试验因设备技术更新换代而大幅提升测试频率上限至3 kHz。以某电动汽车橡胶悬置为研究对象,进行高频动特性试验研究。首先,分析悬置动特性试验边界条件,指出悬置的胶体刚度、支架模态以及试验夹具模态是影响高频动特性的3个主要因素;其次,研究橡胶悬置高频动刚度的主要特点,通过附加质量的方案对动刚度峰值及频率与影响因素的对应关系进行了辨识;然后,总结了3个主要因素对动特性的影响规律,提出电动车悬置及其支架的设计与优化原则;最后,用悬置刚度和支架质量对整车主减速器阶次噪声的改善效果进行试验,验证了橡胶悬置高频动特性研究的必要性和结论的正确性。展开更多
In order to evaluate the ride quality of the soil compactor cab supplemented by the auxiliary hydraulic mounts (AHM), a nonlinear dynamic model of the soil compactor interacting with the off-road deformable terrain is...In order to evaluate the ride quality of the soil compactor cab supplemented by the auxiliary hydraulic mounts (AHM), a nonlinear dynamic model of the soil compactor interacting with the off-road deformable terrain is established based on Matlab/Simulink sofware. The power spectral density (PSD) and the weighted root mean square (RMS) of acceleration responses of the vertical driver s seat, the cab s pitch and roll angle are chosen as objective functions in low-frequency range. Experimental investigation is also used to verify the accuracy of the model. The influence of the damping coefficients of the AHM on the cab s ride quality is analyzed, and damping coefficients are then optimized via a genetic algorithm program. The research results show that the cab s rubber mounts added by the AHM clearly improve the ride quality under various operating conditions. Particularly, with the optimal damping coefficients of the front-end mounts c a 1,2 = 1 500 N · s/m and of the rear-end mounts c a 3,4 =2 335 N · s/m, the weighted RMS values of the driver s seat, the cab s pitch and roll angle are reduced by 22.2%, 18.8%, 58.7%, respectively. Under the condition of the vehicle travelling, with the optimal damping coefficients of c a 1,2 = 1 500 N · s/m and c a 3,4 =1 882 N · s/m, the maximum PSD values of the driver s seat, the cab s pitch and roll angle are clearly decreased by 36.7%, 54.7% and 50.6% under the condition of the vehicle working.展开更多
文摘电驱动力总成悬置系统高频结构噪声控制是电动汽车噪声、振动和声振粗糙度(noise,vibration and harshness,简称NVH)开发与研究的重要内容,悬置动特性试验因设备技术更新换代而大幅提升测试频率上限至3 kHz。以某电动汽车橡胶悬置为研究对象,进行高频动特性试验研究。首先,分析悬置动特性试验边界条件,指出悬置的胶体刚度、支架模态以及试验夹具模态是影响高频动特性的3个主要因素;其次,研究橡胶悬置高频动刚度的主要特点,通过附加质量的方案对动刚度峰值及频率与影响因素的对应关系进行了辨识;然后,总结了3个主要因素对动特性的影响规律,提出电动车悬置及其支架的设计与优化原则;最后,用悬置刚度和支架质量对整车主减速器阶次噪声的改善效果进行试验,验证了橡胶悬置高频动特性研究的必要性和结论的正确性。
基金The Science and Technology Support Program of Jiangsu Province(No.BE2014133)the Prospective Joint Research Program of Jiangsu Province(No.BY2014127-01)
文摘In order to evaluate the ride quality of the soil compactor cab supplemented by the auxiliary hydraulic mounts (AHM), a nonlinear dynamic model of the soil compactor interacting with the off-road deformable terrain is established based on Matlab/Simulink sofware. The power spectral density (PSD) and the weighted root mean square (RMS) of acceleration responses of the vertical driver s seat, the cab s pitch and roll angle are chosen as objective functions in low-frequency range. Experimental investigation is also used to verify the accuracy of the model. The influence of the damping coefficients of the AHM on the cab s ride quality is analyzed, and damping coefficients are then optimized via a genetic algorithm program. The research results show that the cab s rubber mounts added by the AHM clearly improve the ride quality under various operating conditions. Particularly, with the optimal damping coefficients of the front-end mounts c a 1,2 = 1 500 N · s/m and of the rear-end mounts c a 3,4 =2 335 N · s/m, the weighted RMS values of the driver s seat, the cab s pitch and roll angle are reduced by 22.2%, 18.8%, 58.7%, respectively. Under the condition of the vehicle travelling, with the optimal damping coefficients of c a 1,2 = 1 500 N · s/m and c a 3,4 =1 882 N · s/m, the maximum PSD values of the driver s seat, the cab s pitch and roll angle are clearly decreased by 36.7%, 54.7% and 50.6% under the condition of the vehicle working.
