连续振动载荷在线复现控制技术研究

Online replication control technique for continuous vibration loads

提出一种主从分布式振动试验方法,建立了连续振动载荷在线复现控制技术,研制了系统样机。其中,提出一种信号分帧处理与重构技术,解决了长时连续振动载荷的在线波形复现难题;提出一种基于多量级样本库构建与加权平均的传递函数动态估计方法,抑制了系统非线性对控制精度的影响;采用谱误差反馈修正方法,改善了系统的频域控制精度。开展了“1主2从”联台试验,结果表明:时域和频域控制精度良好,整体延迟时间在亚秒量级,全程总均方根值误差在1%以内,为主从分布式振动试验提供了关键技术支撑。

A novel vibration method,the master-slave distributed vibration test method,was proposed.Aiming at its control requirements,an online waveform replication technique for vibration loads was developed and an integrative prototype system with measuring and controlling functions was constructed.Therein,a signal processing method of frame segmentation and reconstruction was proposed for solve the problem that time waveform replication for long-duration continuous vibration loads.A method for dynamic transfer function estimation based on sample database construction and weighted average was proposed to reduce the influence of nonlinear property on control precision.A spectrum correction method was introduced to improve the frequency domain control accuracy.A test with 1 master vibrator and 2 slave vibrators was performed using the developed online vibration load replication control technique,and the results show that the technique has a high replication precision in both time domain and frequency domain,has a subsecond overall delay time,and has a subpercent overall root-mean-square error.The technique can provide a key technique for supporting online distributed vibration tests.