为估算验证橡胶衬套的力学性能,以促进衬套对车辆性能影响研究工作的有效开展,将轿车麦弗逊悬架的衬套作为研究对象,先推导相关应变能密度函数方程,再采用Yeoh,Van der Waals,Ogden(N=3)方程为主的多种本构模型,对衬套NR55橡胶进行材料...为估算验证橡胶衬套的力学性能,以促进衬套对车辆性能影响研究工作的有效开展,将轿车麦弗逊悬架的衬套作为研究对象,先推导相关应变能密度函数方程,再采用Yeoh,Van der Waals,Ogden(N=3)方程为主的多种本构模型,对衬套NR55橡胶进行材料力学性能估算并与其基础试验结果作对比验证,确定Ogden(N=3)方程为衬套结构力学性能估算的较优本构模型.设定多材料系数μ1,μ2,μ3,α1,α2,α3为优化变量并赋初值,初步估算衬套结构力学性能并分析与结构试验结果的一致性,优化目标是"面积重合"和"位移相等"的四类函数,选择自适应响应面法,经过10次迭代,识别出一组能较好估算衬套结构力学性能的本构模型方程系数值.利用最后一次估算值,求解拟合出新曲线,与基础试验估算拟合曲线、结构试验本身刚度曲线进行比较后发现,径(轴)向的刚度值误差均在9.1%以内,考虑各种因素,工程上属可接受范围,说明所述方法可行,能被推广.展开更多
A time frequency de-noising method is presented in the frequency response function （FRF） preprocessing based on the continuous wavelet transform. Morlet wavelet is employed to construct a filter bank to reduce the n...A time frequency de-noising method is presented in the frequency response function （FRF） preprocessing based on the continuous wavelet transform. Morlet wavelet is employed to construct a filter bank to reduce the noise. The filter bank is a finite impulse response （FIR） linear phase filter thus maintaining phase consistency. A modified Morlet base function is proposed to meet the time frequency resolution by using transient excitation. Numerical simulation is conducted using a Group for Aeronautical Research and Technology in Europe （GARTEUR） aircraft model excited by the transient input. The white noise is added to the simulated data. Results show that the accuracy of the system identification is improved. The estimated error of the mode damping is decreased by 30% compared with that obtained from the noise-corrupted signal.展开更多
文摘为估算验证橡胶衬套的力学性能,以促进衬套对车辆性能影响研究工作的有效开展,将轿车麦弗逊悬架的衬套作为研究对象,先推导相关应变能密度函数方程,再采用Yeoh,Van der Waals,Ogden(N=3)方程为主的多种本构模型,对衬套NR55橡胶进行材料力学性能估算并与其基础试验结果作对比验证,确定Ogden(N=3)方程为衬套结构力学性能估算的较优本构模型.设定多材料系数μ1,μ2,μ3,α1,α2,α3为优化变量并赋初值,初步估算衬套结构力学性能并分析与结构试验结果的一致性,优化目标是"面积重合"和"位移相等"的四类函数,选择自适应响应面法,经过10次迭代,识别出一组能较好估算衬套结构力学性能的本构模型方程系数值.利用最后一次估算值,求解拟合出新曲线,与基础试验估算拟合曲线、结构试验本身刚度曲线进行比较后发现,径(轴)向的刚度值误差均在9.1%以内,考虑各种因素,工程上属可接受范围,说明所述方法可行,能被推广.
文摘A time frequency de-noising method is presented in the frequency response function （FRF） preprocessing based on the continuous wavelet transform. Morlet wavelet is employed to construct a filter bank to reduce the noise. The filter bank is a finite impulse response （FIR） linear phase filter thus maintaining phase consistency. A modified Morlet base function is proposed to meet the time frequency resolution by using transient excitation. Numerical simulation is conducted using a Group for Aeronautical Research and Technology in Europe （GARTEUR） aircraft model excited by the transient input. The white noise is added to the simulated data. Results show that the accuracy of the system identification is improved. The estimated error of the mode damping is decreased by 30% compared with that obtained from the noise-corrupted signal.
