A study on structural optimization of hydrogen-supply system cabinet in Fuel Cell Vehicle

Based on the experimental analysis of vibro-acoustic test of the fuel cell vehicle (FCV) while hydrogen-supply system operating independently, it is the improper structure of the hydrogen pump cabinet in power auxiliary system that led to noise emissions both in and out of the vehicle. Modal test and finite element (FE) modal analysis were carried out to verify the sympathetic vibration frequency as well as to optimize structure of the metal cabinet. Analysis result revealed that the cabinet natural modes were multiples of basic frequency of the excitation source, thus resonance emerged while the hydrogen pump operating. Based on the cabinet FE modal analysis, topology optimization was conducted, according to which strengthening rib was implemented on the cabinet to enhance the stiffness. After the amelioration, the modal frequency was obviously increased with less modals in mid and low frequency band. The after-optimized structure of cabinet can avoid sympathetic vibration while the hydrogen pump operating, which provides valuable reference to reduce the noise and vibration in FCV.