一种基于ABAQUS的火箭弹部段连接刚度模型修正方法研究
杨磊,郭治斌,尤春艳,杨元华,杨俊波
(四川航天系统工程研究所,四川 成都 610100)
摘要:火箭弹按照不同功用被设计成若干个部段,部段间通过各种结构形式连接,其连接部位的刚度下降会显著影响全弹的固有特性。本文以某型火箭弹为例,首先,通过全弹刚度试验获取弹体受载后的变形数据;其次,基于ABAQUS软件,采用刚度试验数据结合有限元数值分析的刚度模型修正方法,对火箭弹部段连接刚度进行迭代修正,使得弹体变形量的计算值逐步逼近试验值;最后,利用修正后的模型对火箭弹前六阶固有频率和振型进行分析,分析结果表明经刚度修正后的固有特性计算值更为接近试验实测值,从而验证了该方法在分析此类问题时的有效性。
关键词:连接刚度;ABAQUS;模型修正;固有特性
中图分类号:TE415;TJ7 文献标志码:A doi:10.3969/j.issn.1006-0316.2021.12.006文章编号:1006-0316 (2021) 12-0043-07
Research on a Rocket Structure Connection Stiffness Model Updating Method Based on Abaqus
YANG Lei,GUO Zhibin,YOU Chunyan,YANG Yuanhua,YANG Junbo
( System Engineering Institute of Sichuan Aerospace, Chengdu 610100, China )
Abstract:The rocket consists of several structures according to different functions. And the structures have various forms of connections with different connection stiffness. The stiffness degradation of the connection significantly affects the inherent characteristics of the whole rocket. In this paper, a certain model of rocket is taken as an example. First of all, the deformation data of the rocket body after being loaded is obtained through the rocket’s structure connection stiffness test. Then, the stiffness model updating method based on the stiffness test data and the finite element analysis is adopted to iteratively correct the stiffness of the connection parts through the ABAQUS finite element software, so that the calculated value of the rocket body deformation gradually approximates the test value. Finally, the updated model is used to analyze the first six orders of the rocket’s natural frequencies and the mode shapes. The result shows that the calculated value of the inherent characteristics after the stiffness updating is closer to the test value, which verifies the validity of the method in analyzing such problems.
Key words:connection stiffness;ABAQUS;model updating;inherent property
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收稿日期:2020-11-30
作者简介:杨磊(1979-),男,重庆人,硕士,高级工程师,主要研究方向为力学仿真与试验,E-mail:leiyangcqu@163.com。
 

 

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