Study on the excitation force identification by physical model building

Abstract

This paper proposes excitation force identification method based on a physical model building. If reworking occurs after the assembly of the prototype in mechanical product, cost increases due to the retrofit countermeasures and development period extension. As conventional methods, the mount stiffness method and the matrix inversion method have been proposed. However, mount stiffness method calculates the mount transmission force. Therefore, if the development machine has structure change, preliminary evaluation does not apply. matrix inversion method can solve this problem. However, when the frequency response function contains a measurement error, there is problem that error at the time of invers matrix calculation is propagated to expand. Therefore, in order to avoid the inverse matrix calculation, we propose excitation force identification method based on a physical model construction of the vibration source. In this paper, it was investigated features of the inverse matrix method and physical model construction technique using the basic experiment and analysis. Study a result, the physical model building techniques showed that less than affected by the measurement error inverse matrix method.