基于DASP的变速箱壳体振动模态试验与分析

Experiment and Analysis of Gearbox Shell Vibration Modal based on DASP

通过进行变速箱壳体振动模态试验,客观地分析了变速箱壳体的振动状态。采用DASP（Data Acquisition＆Signal Processing）软件对HW25505TCL型铝合金变速箱壳体进行振动模态试验。利用特征系统实现（ERA）法进行模态参数辨识,并与复频域最小二乘法（PloyLSCF）法对比,得到可靠的1~4阶频率和阻尼,并由此进行振型分析。采用振型相关矩阵进行模态验证,通过与计算模态比较,证明两者的有效性和可靠性。将DASP应用变速箱壳体振动模态试验,不仅获得变速箱壳体高阶频率、阻尼及振型,还可解决类似壳体的振动问题,为进一步改进变速箱壳体的结构特性以及基于模态分析的变速箱壳体故障诊断等提供了理论依据。

Through the experiment of the vibration modal of gearbox shell,the gearbox shell vibration state is analyzed and the stability of its operation is evaluated.By using DASP（Data Acquisition Signal Processing）software,the vibration modal of the HW25505 TCL type aluminum alloy gearbox shell is tested.By the contrast between ERA method and PloyLSCF method,the reliable 1~4order of frequency and damping are obtained,and thus the vibration mode analysis is carried out.By using modal correlation matrix of modal to test and verify,through the comparison with calculating modal,the validity and reliability are proved.Applied DASP to vibration modal test of gearbox shell,not only the gearbox shell high order frequency,damping,vibration mode,and vibration condition can be acquired,but also the vibration problem of similar shell gearbox in operation can be solved,The theoritical basis for the improvement of the gearbox shell structure characteristics and the fault diagnosis of gearbox shell are provided,and had better promotion value in engineering practice.