空气弹簧自由边界模拟控制策略研究  

Research on Control Strategy of Air Spring Free Boundary Simulation

作　　者：侯京锋[1] 刘玥[1] 马平昌[1] 邓哲[1] HOU Jingfeng;LIU Yue;MA Pingchang;DENG Zhe(Beijing Institute of Structure and Environment Engineering Beijing,100076,China)

机构地区：[1]北京强度环境研究所,北京100076

出　　处：《振动．测试与诊断》2024年第5期958-963,1040,共7页Journal of Vibration,Measurement & Diagnosis

摘　　要：针对空气弹簧水平多点支撑自由边界模拟系统存在的过约束、难收敛和非线性控制问题,首先,采用自由度解耦控制方式,在削弱系统内力的基础上,将空间自由度的控制目标分解为每一个控制通道的控制目标,解决了系统过约束问题;其次,利用改进积分分离(proportion integration differentiation,简称PID)控制算法克服系统超调,解决了系统震荡收敛问题;最后,采用经验数据对空气弹簧刚度进行实时二维插值补偿,解决了系统非线性问题。实测结果表明,该控制系统设计合理,系统运行过程平稳,通道间同步性较好,控制策略满足模态试验边界的模拟要求。The control problems existing in the free boundary simulation system which is formed by horizontal multi-point support air springs are severe over-constraints,convergence difficulty and the object non-linear.The decoupling control strategy of 3-degree of freedom motions is applied for over-constraints.The control target is transformed from degrees of freedom to control channels.Meantime,the internal forces are weakened.The improved integral discrete proportion integration differentiation(PID)algorithm is used for overcoming system overshoot.Based on the experiential data,the nonlinear stiffness of air spring is compensated by twodimensional linear interpolation in real time.The field testing shows that the control process is smooth,the algorithm can guarantee synchronization well.In conclusion,the control algorithm meets the requirement of simulate-free boundary for modal test.

关 键 词：空气弹簧 自由边界模拟 系统控制 刚度补偿 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]