Modified transfer path analysis considering transmissibility functions for accurate estimation of vibration source

In this study, we developed a modified transfer path analysis (MTPA) method to more accurately estimate the operational force of the main vibration source in a complicated system subjected to multiple vibration sources, base excitation and several disturbances. In the proposed method, transmissibility functions are adopted to compensate the disturbances due to base excitation or to reject transferred forces from other vibration sources. The MTPA method was verified numerically using a simple beam model and was practically applied to estimate vibration forces of a compressor in an outdoor air conditioner unit. Present results show that the MTPA method is feasible for predicting the pure operation forces of the compressor in an outdoor air conditioner unit regardless of the vibration sources due to a rotating fan and base excitations. The proposed MTPA method has very important advantages that it can be used to more accurately estimates the operational force of the main vibration source, properly rejecting other vibration sources and disturbances.