随机振动下偏心隔振系统仿真分析
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摘要
针对存在严重偏心的机载设备,通过载荷解耦计算各点支撑承受质量载荷,确定隔振系统固有频率,计算系统的刚度和阻尼;将系统中隔振器简化为线性弹簧阻尼单元,建立隔振系统的有限元模型,采用基础运动法分析隔振系统在随机振动下的加速度响应,最后根据试验结果优化隔振器的刚度和阻尼,使隔振系统在随机振动下Y向的加速度响应误差从44.95%降到7.47%,固有频率误差从37.43%降到-0.25%,其他两个方向的仿真误差也都显著降低,获得较精确的隔振系统动力学模型,为偏心机载设备隔振设计提供指导依据。
The problem of eccentric airborne equipment is studied. Each mount load of the equipment is calculated by load decoupling, and the natural frequency, stiffness and damping of the isolation system are calculated. The finite element model is established for the isolation system in which the isolators are simplified as linear spring-dashpot elements. The acceleration response of the isolation system under random vibration excitation is analyzed by using base motion method. At last, stiffness and damping of the isolators are optimized according to test results. After the optimization, the error of the acceleration response in the Y direction of the system decreases from 44.95 % to 7.47 %; the error of the natural frequency decreases from 37.43 % to-0.25 %. And the errors in the other two directions decrease evidently. Therefore, an accurate dynamic model of the system is gained. This study provides an analysis method for eccentric airborne equipment isolation design under random vibration.
The problem of eccentric airborne equipment is studied. Each mount load of the equipment is calculated by load decoupling, and the natural frequency, stiffness and damping of the isolation system are calculated. The finite element model is established for the isolation system in which the isolators are simplified as linear spring-dashpot elements. The acceleration response of the isolation system under random vibration excitation is analyzed by using base motion method. At last, stiffness and damping of the isolators are optimized according to test results. After the optimization, the error of the acceleration response in the Y direction of the system decreases from 44.95 % to 7.47 %; the error of the natural frequency decreases from 37.43 % to-0.25 %. And the errors in the other two directions decrease evidently. Therefore, an accurate dynamic model of the system is gained. This study provides an analysis method for eccentric airborne equipment isolation design under random vibration.
引文
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[2]李朝旭.电子设备的抗振动设计[J].电子机械工程,2002,18(1):51-53.
[3]彭超,杨静,王志海,等.基于有限元法的某机载雷达频综器减振设计[J].机械与电子,2015(9):44-48.
[4]杨文芳,魏强,朱兰琴.基于有限元分析的机载电子设备减振设计[J].振动与冲击,2010,29(5):230-234.
[5]姜伟伟,徐治洲,任戈.机载光电成像设备减振系统仿真及试验[J].噪声与振动控制,2014,34(3):186-189.
[6]夏张辉,宫岛,周劲松,等.车下设备偏心对高速动车组运行平稳性的影响机理研究[J].机械工程学报,2017,53(6):131-137.
[7]李晓波,吴斌,董程,等.捷联惯导减振系统的耦合振动研究[J].装备环境工程,2014,11(2):43-49.
[8]章博,任娟.捷联惯组空间五点减振的振动耦合分析[J].宇航学报,2015,36(9):1030-1035.
[9]朱石坚,楼京俊,何其伟,等.振动理论与隔振技术[M].北京:国防工业出版社,2006.
[10]张文元.ABAQUS动力学有限元分析指南[M].北京:中国图书出版社,2005.