考虑激励影响的机械结构振动敏感测点分析方法

The reasonable selection of vibration sensitive points has a significant impact on mechanical structure health monitoring and fault diagnosis. In this paper,considering the influence of excitation frequency and excitation position on the vibration response of mechanical structure measuring points,a sensitive measurement points analysis method based on frequency response function is proposed. The frequency response function of each measuring point with respect to excitation position is extracted,and the frequency response data matrix is selected and constructed based on different excitation positions and excitation frequency bands. Based on principal component analysis,the frequency response data matrix is reduced to a principal component vector space,and an effective independent iterative matrix is constructed to realize vibration sensitivity analysis considering excitation effects. The influence of different excitation frequency bands and different excitation positions on the vibration sensitivity of measuring points is studied. Transient dynamic simulation and plate structure experiments show that the distribution of sensitive measuring points is different under different excitation frequency bands and excitation positions, and the sensitive measuring points obtained based on the frequency response data matrix analysis under different conditions are more sensitive to the structural vibration under the corresponding frequency bands and excitation positions.