Natural frequency analysis of cryogenic propellant filling system based on equivalent circuit
The study of the natural frequency of the system is of great significance to the fluid-solid coupling vibration.Based on the equivalent circuit method,this paper studied the natural frequency of the cryogenic propellant filling system.The e-quivalent circuit was built on the MATLAB/SIMULINK platform to solve the natural frequency.Finally,the first-order natural frequency of the typical filling system pipeline under different pipeline parameters and fluid physical parameters was calculated.This method is more intuitive to obtain the influence of pipeline parameters and fluid physical parameters on the natural frequency of the system.The research shows that the natural frequency of the filling system is related to the length of the filling pipe.When the pipe diameter is 0.15 m,the natural frequency is reduced by 22.5％when the filling pipe is increased from 5 m to 25 m,and the natural frequency of the system is also reduced after the accumulator was added.The research results can provide techni-cal basis for cryogenic propellant pipeline design and vibration reduction protection.
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