关键词: 整机机匣;结构声强法;振动功率流;振动能量传递规律;振动能量耦合特性

Abstract: To study the transmitting regularities and coupling characteristics of the vibrational energy for casing under multiple unbalance excitations， a whole casing structure， containing compressor casing， combustor casing and turbine casing， was established utilizing finite element method， and the transmitting regularities and coupling characteristics of the vibrational energy of the casing were calculated and analyzed under different load frequencies utilizing structural intensity method. Following conclusion can be summarized: （1） the vibrational energy is carried by longitudinal energy wave and shear energy wave passing through the casing flanges to other casing components with the strongest penetrating capacity when the casing is resonating. （2） The mode shape of the casing is related to the transmitting regularities of the vibrational energy. The casing component with larger vibration amplitudes is also the main casing component for vibrational energy transmission. （3） The transmission of the vibrational energy can be decoupled in the casing. Therefore， the transmission properties of the vibrational energy of the casing under multiple excitations at the same time can be obtained by the linear superposition for vibrational energy of the casing under multiple single excitation. The method and conclusions of this paper can apply to casing vibration attenuation.

Key words: Whole casing structure;Structural intensity method;Vibration power flow;Vibrational energy transmitting regularity;Vibrational energy coupling characteristic