气瓶支架组合体动力模型参数修正与应用

李修峰; 刘正山; 王浩攀; 朱建斌; 崔佳涛

doi:10.13433/j.cnki.1003-8728.2018.0522

气瓶支架组合体动力模型参数修正与应用

doi: 10.13433/j.cnki.1003-8728.2018.0522

1.
中国空间技术研究院通信卫星事业部, 北京 100094;
2.
北京卫星环境工程研究所, 北京 100029

详细信息

作者简介:
李修峰(1987-),工程师,博士,研究方向为航天器结构设计与分析,lixiufeng_its@126.com

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- 文章访问数: 185
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- 被引次数: 0
出版历程
- 收稿日期: 2017-03-14
- 刊出日期: 2018-05-05

Parameters Correction and Application of Dynamic Model for Gas Cylinder and Bracket

1.
Institute of Telecommunication Satellite, CAST, Beijing 100094, China;
2.
Beijing Institute of Spacecraft Environment Engineering, Beijing 100029, China

摘要

摘要: 间隙配合是一种常见的机械结构连接方式，它常常引起不确定的连接刚度。针对这一问题，提出一种采用衬套单元的模型修正方法，确立了一组适用于含间隙特征气瓶支架组合体动力学分析的刚度系数。首先，以实际气瓶支架组合体为研究对象，分别采用多点约束单元和衬套单元模拟组合体中的螺栓连接与间隙配合特征；然后，在初始给定的衬套单元刚度系数条件下，修正组合体有限元建模方式，使其基频分析结果逼近试验结果；最后，采用自适应响应面优化方法进行衬套单元刚度系数修正，将修正参数代入分析模型并再次进行模态分析，验证修正方法与参数的合理性。应用修正参数至新型气瓶支架结构研制中，通过模态分析较好地预示了组合体的刚度性能，主要模态分析值与试验值最大偏差小于4.5%，验证了修正方法的通用性，为类似结构的研制提供了很好的技术支撑。
- 气瓶支架 /
- 动力模型 /
- 模态分析 /
- 优化 /
- 参数修正
Abstract: Clearance fit is a kind of common mechanical connection in engineering, it usually introduces uncertain connection stiffness. A parameter correction method with bushing element is proposed in the paper and a set of stiffness coefficients which suits for the finite element analysis of gas cylinder and its bracket assembly with gap feature is obtained. Firstly, the finite element model of gas cylinder and its bracket assembly is built, the bolt fastener and clearance fit are simulated by multi-point constraint element and bushing element, respectively. Secondly, the modeling method of the assembly is modified and the agreement between the modal analysis results and the test results with the original given stiffness coefficients of bushing element is verified. Finally, the stiffness coefficients are corrected with the adaptive response surface optimization method and their rationality is verified. The corrected coefficients are applied to the design of a new bracket. The analytical frequency results agree well with the test frequency results and the maximum deviation is less than 4.5%. Therefore, the veracity of the corrected coefficients and generality of the correction method are verified. A helpful reference is offered for the design and analysis of the similar structure.
- gas cylinder and its bracket /
- dynamic model /
- modal analysis /
- optimization /
- parameter correction

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