Evaluation of High Frequency Vibration of a Coupling Structure by Statistical Modal Analysis

This paper presents an evaluation method of coupling structures for high frequency vibration by Statistical Modal Analysis. For low frequency domains where the modal analysis is effective, Substructure Synthesis Method (SSM) has been studied as a modeling technique for coupling structures. However, with modal analysis based on finite element models, it becomes difficult to maintain the accuracy with increased frequency. Additionally, Statistical Energy Analysis (SEA) has not been established yet as a method of high precision for the prediction of noise and vibration because of the assumptions and approximations. From this point of view, a statistical method using modal analysis (called Statistical Modal Analysis ; SMA) was proposed. However, the SMA only applies to a flat plate and a L-form structure. In this paper, the SMA is applied to a coupling structure that is part of the Gas Heat Pump Outdoor Unit. As a result, it is shown that the SMA is applicable and effective to analyze the complex and coupling structure vibration.