基于前反馈控制方法的变截面杆中应力波消振研究  

Research on Stress Wave Vibration Suppression in a Variable Cross Section Rod Based on Forward Feedback Control Method

作　　者：马磊 赵翼飞 袁庆磊 邹魁 MA Lei;ZHAO Yifei;YUAN Qinglei;ZOU Kui(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang Liaoning 110020,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110020

出　　处：《机床与液压》2024年第13期74-81,共8页Machine Tool & Hydraulics

摘　　要：基于应力波的基本传播方程,对杆件中的应力波传播方式进行推导,并预测杆件下游的应力波。设计一种前馈控制系统接收杆中上游的应力波传播信号,将接收到的信号通过控制系统得到的数据激励下游杆件中的压电陶瓷致动器,致动器在杆中激发出与输入电压成正比的法向力,通过抵消杆中的应力实现杆中应力波振幅减小,达到减振目的。并对输出结果进行有限元仿真,结果表明:测量噪声对前馈控制系统的消振影响很大。对杆中传播的干扰波和噪声信号进行建模,并以状态空间表达式来描述干扰信号和噪声信号的模型,通过输出干扰信号和噪声信号方差和,确定改进前馈控制系统的参数,得到修改后的前馈控制系统。将修改后的前馈控制系统的输出与杆中的应力波抵消过程进行仿真,验证修改后的前馈控制程序有效降低了杆中的应力波振动。Based on the basic propagation equation of stress wave,the propagation mode of stress wave in the rod was derived,and the stress wave downstream of the rod was predicted.A feedforward control system was designed to receive the stress wave propagation signal in the upstream of the rod.The received signal was used to excite the piezoelectric ceramic actuator in the downstream rod through the control system,and the actuator excited a normal force in the rod that was proportional to the input voltage.By offsetting the stress in the rod,the amplitude of the stress wave in the rod was reduced to achieve vibration reduction,and finite element simulation was conducted on the output results.The simulation results show that the measurement noise has a significant impact on the vibration reduction of the feedforward control system.The interference wave and noise signal propagated in the rod were modeled,and the state space expression was used to describe the modeling of the interference signal and noise signal.The output of the variance sum of the interference signal and noise signal was obtained,the parameters of the improved feedforward control system were determined,the modified feedforward control system was obtained,and the output of the modified feedforward control system and the stress wave cancellation process in the rod were simulated to verify that the modified feedforward control program effectively reduced the stress wave vibration in the rod.

关 键 词：应力波 前馈控制 消振 杆件 噪声 

分 类 号：O347.4[理学—固体力学]