履带急救车非线性减振系统动态性能优化
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摘要
针对履带急救车非线性减振系统在随机激励下的动态性能优化问题,首先提出了一种基于改进的分块增维精细积分法和NSGA-Ⅱ算法的多目标参数辨识方法,对履带急救车非线性减振系统进行了参数辨识;然后,应用Sobol’法分析了减振系统各物理参数对系统输出的全局灵敏度;最后,应用遗传算法对减振系统进行了动态性能优化。结果表明:经过优化,担架台垂向振动加权加速度均方根值由原来的0.521 0 m/s2下降为0.418 3 m/s2,降幅达19.7%,减振系统动态性能得到了明显改善。
For the dynamic performance optimization of a tracked ambulance nonlinear vibration-reduction system under random excitation,a new multi-objective parameter identification method based on the improved partitioning and dimensional increment precise integration method and NSGA-Ⅱ method was proposed to identify the parameters of the tracked ambulance nonlinear vibration-reduction system. The Sobol' method was used to study the global sensitivity of the parameters with respect to the system output. And then,the dynamic performance was optimized by using genetic algorithm. The optimization results showed that the root mean square value of the stretcher base's weighted vertical acceleration reduces from 0. 5210 m / s2 to 0. 4183 m / s2 with a 19. 7% drop,the dynamic performance of the vibrationreduction system is improved significantly.
For the dynamic performance optimization of a tracked ambulance nonlinear vibration-reduction system under random excitation,a new multi-objective parameter identification method based on the improved partitioning and dimensional increment precise integration method and NSGA-Ⅱ method was proposed to identify the parameters of the tracked ambulance nonlinear vibration-reduction system. The Sobol' method was used to study the global sensitivity of the parameters with respect to the system output. And then,the dynamic performance was optimized by using genetic algorithm. The optimization results showed that the root mean square value of the stretcher base's weighted vertical acceleration reduces from 0. 5210 m / s2 to 0. 4183 m / s2 with a 19. 7% drop,the dynamic performance of the vibrationreduction system is improved significantly.
引文
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[2]Pacheco R P,Steffen V.On the identification of non-linear mechanical systems using orthogonal functions[J].International Journal Non-linear Mechanics,2004,39(7):1147-1159.
[3]徐崇刚,胡远满,常禹,等.生态模型的灵敏度分析[J].应用生态学报,2004,15(6):1056-1062.XU Chong-gang,HU Yuan-man,CHANG Yu,et al.Sensitivity analysis in ecological modeling[J].Chinese Journal of Applied Ecology,2004,15(6):1056-1062.
[4]Morris M D.Factorial sampling plans for preliminary computational experiments[J].Technometrics,1991,33(2):161-174.
[5]尹俊杰,常飞,李曙林,等.基于Sobol法的整体翼梁损伤容限设计参数灵敏度分析[J].空军工程大学学报(自然科学版),2013,14(6):9-12.YIN Jun-jie,CHANG Fei,LI Shu-lin,et al.Analysis of parameter sensitivity on damage tolerance design of overall beam based on sobol method[J].Journal of Air Force Engineering University(Natural Science Edition),2013,14(6):9-12.
[6]葛根,王洪礼,谭建国.多自由度非线性动力方程的改进增维精细积分法[J].天津大学学报,2009,42(2):113-117.GE Gen,WANG Hong-li,TAN Jian-guo.Improved increment-dimensional precise integration method for the nonlinear dynamic equation with multi-degree-of-freedom[J].Journal of Tianjin University,2009,42(2):113-117.
[7]Kalyanmoy D,Amrit P,Sameer A,et al.A fast and elitist multiobjective genetic algorithm:NSGA-Ⅱ[J].IEEE Transactions On Evolutionary Computation,2002,6(2):182-197.
[8]李玥.基于多目标遗传算法的航空发动机多目标优化控制[D].南京:南京航空航天大学,2007:6-23.
[9]杨猛,徐新喜,苏琛,等.履带急救车非线性减振系统振动特性及运动稳定性分析[J].振动与冲击,2013,32(17):183-188.YANG Meng,XU Xin-xi,SU Chen,et al.Vibration characteristics and motion stability of a tracked ambulance nonlinear vibration-reduction system[J].Journal of Vibration and Shock,2013,32(17):183-188.
[10]苏琛,徐新喜,高振海,等.某履带急救车减振效率及乘卧舒适性分析[J].振动、测试与诊断,2012,32(5):854-857.SU Chen,XU Xin-xi,GAO Zhen-hai,et al.Analysis on two level damping efficiency and recumbent comfort for tracked emergency ambulance[J].Journal of Vibration,Measurement&Diagnosis,2012,32(5):854-857.
[11]刘伟,曹刚,翟红波,等.发动机管路卡箍位置动力灵敏度分析与优化设计[J].航空动力学报,2012,27(12):2756-2762.LIU Wei,CAO Gang,ZHAI Hong-bo,et al.Sensitivity analysisand dynamic optimization design of supports’positions for engine pipelines[J].Journal of Aerospace Power,2012,27(12):2756-2762.
[12]张晓航.防空导弹武器装备体系作战效能全局敏感性分析方法研究[D].长沙:国防科学技术大学,2010:29-36.
[13]陈刚,汪玉,毛为民,等.冲击载荷作用下舰艇管路系统全局参数灵敏度分析[J].振动与冲击,2007,26(3):45-48.CHEN Gang,WANG Yu,MAO Wei-min,et al.Global parameter sensitivity analysis of shipboard piping systems under shock loads[J].Journal of Vibration and Shock,2007,26(3):45-48.