Multi-dimensional vibration power flow analysis of compressor system mounted in outdoor unit of an air conditioner

Abstract Vibration generated by an excitation source is in general transmitted to a receiver structure through multiple paths, i.e., multiple points in multiple directions. The multi-dimensional vibration transmission path analysis can be effectively accomplished by employing the vibration power approach because the contribution of each path to the total vibration transmission can be readily represented and, furthermore, the vibration power transmitted to the receiver is closely related to the noise radiation from the receiver. The main content of the work presented in this paper is to apply the concept of the vibration power flow to a practical system of multi-dimensional vibration isolation systems for the vibration transmission path analysis. In addition, the role of the vibration power flow will be illustrated as a measure of the vibration transmission onto as well as the resultant noise radiation from the receiver structure. In this paper, the vibration power flow approach is applied to a compressor system mounted in outdoor unit of an air conditioner in order to determine the most dominant transmission path. Then, the frequency characteristics of the vibration power flow to the receiver structure are compared with those of the structural vibration level on and the resultant noise emission from the receiver structure.