火箭被动减振结构——C型弹簧的设计

The Design of Passive Vibration Isolation for Rocket with C-spring Isolators

为了研究C型弹簧对火箭减振的作用,采用有限元方法,建立了包含C型弹簧的火箭有限元模型,对火箭结构的减振进行设计。研究发现在12~285 Hz频率范围内,C型弹簧被动减振结构具有良好的减振效果。进一步讨论了C型弹簧的材料、厚度、宽度以及数量等影响因素在较低频率下对C型弹簧减振效果的影响。在进行C型弹簧设计时,采用具有较小杨氏模量的材料有利于减振,在同等条件下,减小C型弹簧厚度、宽度和数量,对减振有利。

To investigate the role of C-spring in rocket vibration,finite element method was used to establish the finite element model of rocket with C-spring isolator for the design of passive vibration isolation for rocket.Based on finite element method,the frequency responses of rocket with C-spring isolator was calculated.The vibration can be reduced obviously in the frequency range of 12~285 Hz.The effects of materials,the thickness,the width and the numbers on the passive vibration isolation were further studied in low frequency domain.The lower elastic modulus of material can be beneficial to the design of the C-spring isolator.In the condition of the same sizes,the decreases of the width,the thickness and the C-spring number can be beneficial to the passive vibration isolation.