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In order to study the influence of seismic excitation on the rocket body during the propellant injection and launch waiting state of a certain rocket, the dynamic response analysis of the rocket structure was carried out, and the seismic response spectrum analysis and time-history analysis were respectively used to solve the structural dynamic response.SolidWorks was used to establish a simplified three-dimensional model of the rocket body, and ANSYS Workbench was imported to solve the static stress, modal frequency and mode of the rocket. Time-history analysis of El-centro seismic wave data was carried out, and Fourier transform was applied to frequency domain spectrum for seismic response spectrum analysis. Cloud maps of structural equivalent stress, displacement and strain were obtained. After numerical verification, the results show that the rocket meets the safety requirements of seismic resistance, and more research methods are verified for the optimization of the rocket body. Introduction In the waiting state of liquid rocket for launch, environmental humidity, temperature, vibration and impact brought by the outside world and other factors affect its effectiveness to varying degrees, especially in the face of natural disasters such as earthquake [1], there are many difficulties in ensuring the safety of rocket before launch. The aseismic performance of the rocket structure directly affects the personal and property safety. Therefore, it is necessary to verify the overall safety of the rocket and analyze the seismic dynamic response of the rocket structure. Under the action of earthquake excitation, J.M. Spritzer [2] studied several limit states such as hydrostatic ring stress, uplift, bottom stress and buckling of large surface storage tanks, as well as two stability mechanisms of shear and capsizing. Hamid Kazem [3] studied the finite element model of oil refinery storage tank, analyzed and calculated the dynamic characteristics and failure mode of the model under earthquake excitation. H.E. Estekanchi [4] proposed a Endurance Time method for evaluating the seismic performance of storage tanks. The finite element analysis results show that the method is reasonable in accuracy and has strong applicability in seismic response calculation of steel tanks. According to the research status, the simulation method of vibration response of the rocket body under seismic excitation is relatively simple and lacks comparative advantages, which cannot better reflect the vibration characteristics of the structure. In this paper, the response spectrum analysis and time-history analysis respectively on the arrow to evaluate structural response under earthquake excitation, establish a finite element three-dimensional solid model, static stress analysis, structure vibration characteristic is obtained by using the modal analysis, determine the natural frequency and vibration mode of structure, through seismic response spectrum analysis from the Angle of the frequency domain calculation peak response of the structure of the arrow, using time-history analysis method from the Angle of time domain calculation of structural response, comparison of advantages and disadvantages for the methods of the differences and results.

Dynamic Response of the Rocket Body under Seismic Excitation