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。
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.
关键词
新型阻尼结构 /
Stewart平台 /
冲击响应 /
特性分析
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Key words
new damping structure /
Stewart platform /
shock response /
characteristic analysis
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