Influence of additional mass on transmission housing modal
To analyze the influence of the additional mass on transmission housing modal,taking the transmission housing of a compact car as an example,the sensor is used to simulate the additional mass of the transmission housing,and seven modal test schemes are set up to analyze the changes of the intrinsic frequency of the transmission housing under the same additional mass acting on different measurement points,different additional masses acting on the same measurement points,and different additional mass distributions.The validity and reliability of the modal test data are verified by modal confidence criterion,modal phase collinearity and average phase offset.The results show that the thickness of the transmission housing is uneven,and the influence of the same additional mass acting on the different measurement points on the transmission housing modal is different.The modal shape at the thin wall of the transmission housing is larger,and the intrinsic frequency is smaller.The larger the additional mass at the same measurement point is,the smaller the intrinsic frequency of the transmission housing modal is.When the additional mass is evenly distributed in the transmission housing,the intrinsic frequency is small.For thin-walled structural parts such as transmission housings,preference should be given to non-contact sensor and lightweight sensor in the modal test,the additional mass should be evenly distributed into the structure,and the nodes and areas with large mode amplitude should be avoided as much as possible.
万方数据
维普
