模态参数识别和输入整形相结合的抑振方法
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TH113.1;TP242.2

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国家科技重大专项资助项目(2015ZX04005006);广东省科技重大专项资助项目(2014B090921004,2014B090920002);广州市科技重大专项资助项目(20160404009)


Residual Vibration Suppression by an Integrated Method of Parameter Identification and Input Shaping
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    摘要:

    针对输入整形技术对模态参数的高度依赖性以及整形器给系统带来延时的问题,提出一种模态参数识别和无延时输入整形结合的复合方法。以单自由度机械臂为对象,研究在S型曲线输入信号作用下系统的振动特性,定量分析该方法对机械臂残余振动幅值的影响。搭建了机械臂残余振动抑制测试的实验平台,并采用对系统模态参数最敏感的零振动(zero vibration,简称ZV) 型整形器进行间歇-间歇 (rest-to-rest)实验。结果显示,使用该方法后机械臂残余振动的最大振幅仅为原最大振幅的31% ,稳定时间由整形前的0.118s缩短到整形后的0.043s,机械臂运动控制的总时间由1.738s降为1.643s,表明该方法有效地抑制了机械臂的残余振动,并保证了机械臂的工作效率。

    Abstract:

    Serious residual vibrations are widely and frequently observed when industrial robots are conducting fast motions. Input shaping technology is used to reduce the residual vibration of many systems by generating a command signal that is self-canceling. It is difficult to obtain the modal parameters of the system due to the modeling errors. Thus, the residual vibration are never exactly suppressed on real systems. In the light of these problems, an integrated method of parameter identification and input shaping technology is proposed and a modified input shaping approach is developed, The time delay introduced by conventional input shaping technique is fully compensated in the proposed approach. In order to achieve the precise and rapid rest-to-rest motion, a single degree-of-freedom robot arm is used as an application case. Experimental results show that the proposed method significantly reduces the residual vibration of the robot arm, the maximum amplitude of residual vibration is only 31% of the original′s. At the same time, the settle time is shortened from0.118 s to 0.043 s, and the total time of motion control is reduced from 1.738s to 1.643s.

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  • 在线发布日期: 2019-07-08
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