为提高运载能力，运载火箭多采用捆绑助推器的结构形式。以典型的捆绑火箭为背景，针对捆绑连杆特殊的结构形式造成的拉压不同刚度特性，采用双线性弹簧建立助推器径向平面机理模型，研究捆绑联接装置的动力学特性。通过与传统模型进行对比，表明拉压不同刚度模型能够更加准确地反映结构的频率和载荷，以分析结果作为依据，可以有效提高火箭结构设计的可靠性和合理性。%In order to increase the launching capability, the strap-on booster is widely adopted in launch vehicles. Based on the mechanical research of the strap-on strut, the different axial stiffness in tension and compression property is acquired. Then a schematic model of the booster using the bi-linear stiffness spring is established to analyze the dynamic response mechanism of the strap-on attachment equipment under radial impact. Compared with conventional linear models, the frequency and load results from the proposed model were more exact. With the results via the proposed model, the reliability of the rocket structure will be effectively improved.
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