基于新型阻尼结构Stewart隔冲平台特性分析

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摘要针对设备在强冲击环境下的防护问题，根据环形间隙阻尼系数计算公式，并以双出杆阻尼结构为基础，提出一种基于新型阻尼结构的Stewart抗冲隔振平台。通过数值仿真对比了，单自由度下新型阻尼结构与传统双出杆阻尼结构的耗能特性，结果表明相比双出杆阻尼结构，两者的最大阻尼力差值随激励频率的增大而增大，新型阻尼器耗能增加了28%。通过Adams与Matlab的联合仿真，对新型阻尼结构Stewart平台和双出杆阻尼结构Stewart平台进行冲击响应计算；在垂直冲击中，两种平台支腿阻尼力最大相差为310 N，新型阻尼结构Stewart平台复位时间相比与双出杆阻尼结构Stewart平台缩短了49.7%；而在倾斜45°冲击中，新型阻尼结构Stewart平台相比于双出杆阻尼结构Stewart平台在y向缩短了26.2%的复位时间，在z向缩短了36.3%。根据正负双波测试的结果，联合仿真计算可以准确地描述Stewart平台在撞击下的响应特性。同时也证明了平台具有更好的抗冲击阻尼能力。

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	张春辉
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关键词 ：新型阻尼结构, Stewart平台, 冲击响应, 特性分析

Abstract：Here, aiming at the protection problem of equipment under strong impact environment, according to the calculation formula of annular gap damping coefficient, and based on double-out-bar damping structure, a Stewart anti-impact vibration isolation platform based on new damping structure was proposed. Through numerical simulation, energy-dissipating characteristics of new damping structure were compared with those of traditional double-out-bar damping structure under condition of SDOF. The results showed that the difference between the maximum damping forces of the two structures increases with increase in excitation frequency, the energy-dissipating of the new damping structure increases by 28%; through co-simulation of Adams and MATLAB, impact responses of Stewart platform with new damping structure and Stewart platform with double-out-bar damping structure were calculated; in vertical impact, the maximum difference between leg damping forces of the two platforms is 310 N, the reset time of Stewart platform with new damping structure is 49.7% shorter than that of Stewart platform with double-out-bar damping structure; while in inclined 45° impact, compared to Stewart platform with double-out-bar damping structure, the reset time of Stewart platform with new damping structure decreases by 26.2% in y direction and 36.3% in z direction; according to the positive and negative dual-wave testing results, the co-simulation calculation can accurately describe response characteristics of Stewart platform under impact, and reveal Stewart platform with new damping structure has better anti-shock damping capacity.

Key words： new damping structure Stewart platform shock response characteristic analysis

收稿日期: 2019-12-30 出版日期: 2021-08-15

引用本文:

张春辉，卢凯田，刘洪权，张磊. 基于新型阻尼结构Stewart隔冲平台特性分析[J]. 振动与冲击, 2021, 40(15): 277-293.
ZHANG Chunhui, LU Kaitian, LIU Hongquan, ZHANG Lei. Characteristic analysis of Stewart shock isolation platform based on new damping structure. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(15): 277-293.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I15/277

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