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。
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.
作者
张春辉
卢凯田
刘洪权
张磊
ZHANG Chunhui;LU Kaitian;LIU Hongquan;ZHANG Lei(Naval Academy of Armament,Beijing 100161,China;College of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第15期277-283,共7页
Journal of Vibration and Shock
