Impact Vibration Analysis And Frame Size Optimization Of Fuel Cell Vehicle Hydrogen Supply System

Vehicle-borne hydrogen supply system is an important part of fuel cell vehicle.Its main function is to provide hydrogen for fuel cell reactor.Once the hydrogen supply system is damaged,it will lead to the obstruction of hydrogen transmission,inadequate energy supply and hydrogen leakage in serious cases,which will not only cause certain economic losses,but also cause huge personal and property hazards.So the safety of hydrogen supply system is the primary problem of fuel cell vehicles.In this paper,ANSYS finite element software is used to analyze and study the hydrogen supply system of two-bottle group in vehicle.The main contents are as follows:1.ANSYS is used to analyze the full-winding cylinder of carbon fibre with aluminium inner liner used in hydrogen system.The situation of variable angle and thickness winding of carbon fiber head is simulated and the stress distribution of inner liner and winding layer of hydrogen cylinder under five working conditions including autofrettage condition,zero pressure condition,working condition,water pressure test condition and blasting condition is obtained to ensure safety in use.2.Through static analysis and transient analysis,the stress state of the key parts of the hydrogen supply system of the two-cylinder group under impact load and the relative slip of the cylinder under impact load are simulated.According to the stress state of the system,the frame structure is optimized and improved to further ensure that the system has a certain degree of security in case of impact.3.The PSD random vibration analysis method is used to obtain the modal solutions of the hydrogen supply system in the frequency range of 1-200Hz,and the random vibration results under five power spectral density curves are obtained by superimposing the modal solutions.Finally,the strength,stiffness and fatigue life of the system are evaluated based on the 3? theory.4.Design Exploration module is used to optimize the stiffness and strength of the frame structure of the hydrogen supply system under impact condition and vibration condition.The response surface between the width and length of the frame and the stiffness and strength of the system under impact condition and vibration conditionis are established to obtain the optimal size of the frame structure which can effectively reduce the stress state of the system structure under impact condition and vibration condition.