The principle and Application of the Multiple and Partial Coherence Analysis

摘要

The basic principles of the partial and multiple coherence ananlysis and their utilization on vibration source identification are discussed in detail in this paper. The partial coherence analysis is the effective method of vibration source identification in multiple input—single output systems. Formerly, there was not any this kind of function in the signal processor, and there was not any special software too. The software which we developed and used in the 7T 17S signal processor has this function. This software can be used not only for the partial and multiple coherence analysts of signal, but also for the correlation analysis, power spectrum analysis, transfer function analysis el al. We used this software to make the identifcation of the vibration source of the car floor board of electrical measuring vehicle, and to find the main factors which effect the vibration of the car board. The excellent result was obtained. This method can also be used for making the identifications of noise source and other sources.