Dynamic Characteristics Of The Components Of A Rocket Matching And Optimization

This paper takes a multiple rocket launcher as its research background. The natural frequency matching analysis and the launch dynamics during the firing is studied by the theory of structural dynamics and optimal structure theory. The initial disturbance is reduced by optimizing the structures of existing.The main content as the follows:(1) After the analysis of the multiple rocket launcher structure, this paper simplifies the model including ignoring the tiny structural features which does not affect the structural stiffness and mass. Meshing the model and add all kinds of contact and load, the finite element model can accurately simulate the original structure is established finally.(2) The nature frequency and mode of vibration of the main components is calculated by modal analysis. According to the results,this paper analyzes dynamic characteristics of distribution of different parts, and evaluates its rationality.(3) Using the established FEA model.this paper simulate the launch process with explicit algorithm and get the results of the stress distribution and angular rotation of rocket muzzle in the launch process.From the FFT of the angular rotation, this paper gets the frequency which has the biggest influence on vibration.(4) According to the result of modal analysis and launch dynamics to analyze dynamic characteristics and determine the natural frequency of each component and the component need improvement.OPTISTRUCT is adopted to optimize components.At last,This paper verifies the effectiveness of this optimization.