火箭推进

轨姿控发动机振动试验夹具结构拓扑优化

(西安航天动力研究所,陕西西安710100)

关键词：轨姿控发动机; 块状夹具; 锥状夹具; 多目标拓扑优化; 固有频率; 振动试验

Structural topology optimization of vibration test fixture for orbit and attitude control engines

ZHANG Yuntao, XUE Jie, SONG Shaowei, WU Dan, LIU Jianzhao

(Xi'an Aerospace Propulsion Institute,Xi'an 710100,China)

Keywords：orbit and attitude control engine; block fixture; cone fixture; multi-objective topology optimization; natural frequency; vibration test

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针对轨姿控发动机部分振动试验夹具存在质量偏大、频率特性差等问题,采取拓扑优化的方法对典型试验夹具进行了结构设计改进。基于Optistruct的拓扑优化模块,讨论了动力学拓扑优化模型及多目标优化的实现策略,介绍了离散度参数及最小成员尺寸等优化控制参数的设置。通过对推力装置块状试验夹具的拓扑优化,研究了优化目标及控制参数对优化结果的影响。优化后夹具频率特性满足试验要求,减速效果明显。通过实物振动试验,验证了正弦振动和随机振动试验条件下夹具控制响应平稳,满足试验容差要求。最后,通过对某型轨姿控发动机整机锥状试验夹具的结构设计改进,进一步拓展应用了拓扑优化方法。仿真结果表明,优化后夹具的模态频率和动态响应特性显著改善,为后续发动机振动试验夹具设计提供借鉴。

Aiming at the problems of some vibration test fixture of orbit and attitude control engines,such as large mass, low frequency characteristic, the topology optimization method was adopted to improve the structure design of typical test fixture.Based on the topology optimization module of Optistruct software, the dynamic topology optimization model and multi-objective optimization strategy were discussed, and the setting of optimization control parameters such as dispersion parameters(DISCRETE)and minimum member size(MINDIM)was introduced.Based on the topology optimization of block test fixture of thrust device, the influence of optimization objectives and control parameters on optimization results was studied.The optimized fixture frequency characteristics meet the test requirements, and the weight reduction effect is obvious.The fixture control response under sinusoidal and random vibration test conditions is verified to be stable and effective, and meets the tolerance requirements of the test.Finally, by improving the design of cone test fixture of a certain orbit and attitude control engine, the topology optimization method is further extended and applied.The simulation results show that the modal frequency and dynamic response characteristics of the optimized fixture are significantly improved, which provides reference and guidance for the design of vibration test fixture.

引言
1 拓扑优化方法
2 块状夹具结构优化及验证
3 锥状夹具结构优化应用
4 结论

图1 不同离散度参数的拓扑优化结果<br/>Fig.1 Topology optimization results with different DISCRETE parameters

图1 不同离散度参数的拓扑优化结果
Fig.1 Topology optimization results with different DISCRETE parameters

图2 不同最小成员尺寸的优化结果<br/>Fig.2 Topology optimization results with different MINDIN parameters

图2 不同最小成员尺寸的优化结果
Fig.2 Topology optimization results with different MINDIN parameters

图3 “棋盘格”参数设置对拓扑优化结果的影响<br/>Fig.3 Influence of CHECKER parameter settings on topology optimization results

图3 “棋盘格”参数设置对拓扑优化结果的影响
Fig.3 Influence of CHECKER parameter settings on topology optimization results

图4 块状夹具初始优化模型<br/>Fig.4 Initial optimization model of block fixture

图4 块状夹具初始优化模型
Fig.4 Initial optimization model of block fixture

图5 单目标拓扑优化结果<br/>Fig.5 Results of single objective topology optimization

图5 单目标拓扑优化结果
Fig.5 Results of single objective topology optimization

图6 多目标拓扑优化结果<br/>Fig.6 Results of multi-objective topology optimization

图6 多目标拓扑优化结果
Fig.6 Results of multi-objective topology optimization

图7 离散度参数不同取值的拓扑优化结果<br/>Fig.7 Optimization results of dispersion parameters with different values

图7 离散度参数不同取值的拓扑优化结果
Fig.7 Optimization results of dispersion parameters with different values

图8 最小成员尺寸不同取值的拓扑优化结果<br/>Fig.8 Optimization results of different values of minimum member size

图8 最小成员尺寸不同取值的拓扑优化结果
Fig.8 Optimization results of different values of minimum member size

图9 x、y向试验状态夹具优化结果<br/>Fig.9 Optimization results of fixture in x and y test direction

图9 x、y向试验状态夹具优化结果
Fig.9 Optimization results of fixture in x and y test direction

图10 z向试验状态夹具优化结果<br/>Fig.10 Optimization results of fixture in z test direction

图10 z向试验状态夹具优化结果
Fig.10 Optimization results of fixture in z test direction

图11 块状夹具拓扑优化后的结构形状<br/>Fig.11 The block fixture structure form after topology optimization

图11 块状夹具拓扑优化后的结构形状
Fig.11 The block fixture structure form after topology optimization

图12 优化后的夹具第一阶模态振型<br/>Fig.12 The first vibration mode of block fixture after topology optimization

图12 优化后的夹具第一阶模态振型
Fig.12 The first vibration mode of block fixture after topology optimization

表1 块状夹具拓扑优化前、后的主要参数对比<br/>Tab.1 Comparison of main parameters of block fixture before and after optimization

表1 块状夹具拓扑优化前、后的主要参数对比
Tab.1 Comparison of main parameters of block fixture before and after optimization

图13 振动试验夹具安装图<br/>Fig.13 Installation diagram of vibration test fixture

图13 振动试验夹具安装图
Fig.13 Installation diagram of vibration test fixture

图14 正弦扫描试验控制响应谱曲线<br/>Fig.14 Control response spectrum of sinusoidal test

图14 正弦扫描试验控制响应谱曲线
Fig.14 Control response spectrum of sinusoidal test

图15 随机振动试验控制响应谱曲线<br/>Fig.15 Control response spectrum of random vibration test

图15 随机振动试验控制响应谱曲线
Fig.15 Control response spectrum of random vibration test

图16 锥状夹具拓扑优化流程<br/>Fig.16 Cone fixture topology optimization process

图16 锥状夹具拓扑优化流程
Fig.16 Cone fixture topology optimization process

图17 优化前锥状夹具的前四阶模态<br/>Fig.17 The first four vibration modes of the cone fixture before optimization

图17 优化前锥状夹具的前四阶模态
Fig.17 The first four vibration modes of the cone fixture before optimization

图18 优化后锥状夹具的前四阶模态<br/>Fig.18 The first four vibration modes of the optimized cone fixture

图18 优化后锥状夹具的前四阶模态
Fig.18 The first four vibration modes of the optimized cone fixture

表2 锥状夹具拓扑优化前、后的主要参数对比<br/>Tab.2 Comparison of main parameters of cone fixture before and after optimization

表2 锥状夹具拓扑优化前、后的主要参数对比
Tab.2 Comparison of main parameters of cone fixture before and after optimization

图19 优化前夹具上端面加速度幅频曲线<br/>Fig.19 Acceleration amplitude-frequency response curve of upper face of fixture before optimization

图19 优化前夹具上端面加速度幅频曲线
Fig.19 Acceleration amplitude-frequency response curve of upper face of fixture before optimization

图20 优化后夹具上端面加速度幅频曲线<br/>Fig.20 Acceleration amplitude-frequency response curve of upper face of optimized fixture

图20 优化后夹具上端面加速度幅频曲线
Fig.20 Acceleration amplitude-frequency response curve of upper face of optimized fixture

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期刊信息

火箭推进
JOURNAL OF ROCKET PROPULSION

主管中国航天科技集团有限公司

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电话 029-85208348

Email hjtj@casc11.com

标准刊号 ISSN 1672-9374
CN 61-1436/V

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引言

1 拓扑优化方法

2 块状夹具结构优化及验证

3 锥状夹具结构优化应用

4 结论

期刊信息