Random Vibration Analysis for the Structure of the Airborne Evaporation Circulatory System

The structure of the airborne evaporation circulatory system is under the influence of the variety vibration caused by the helicopter during the long time running, which will cause the structure damage. The PSD analysis method is introduced into the random vibration analysis of the structure of the airborne evaporation circulatory system. A modal analysis of structure is carried out to obtain the modal frequency. When a acceleration PSD is loaded on the structure, stress and the dangerous position of the 1 sigma, sigma 2 and 3 sigma are obtained by adopted the software ANSYS Workbench. As the method is clear, simple calculation, it has a guiding significance for engineering application in design structure of airborne evaporation circulatory system. The structure of the airborne evaporation circulatory system is under the influence of the variety vibration caused by the helicopter during the long time running, which will cause the structure damage. The random vibration analysis mainly includes the time domain analysis method based on statistical counting and the frequency domain analysis method based on power spectral density(1-2). Counting the number of cycles is the needed method and data processing is grate in the time domain analysis, while, it does not need to cycle count in the frequency domain analysis method. Based on the external turbulence of the system, the PSD of the stress response of the structure can obtained through dynamic simulation and finite element analysis. The structure dangerous point location can be got by using the PSD.