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On-off nonlinear active control of floor vibrations

机译：地板振动的开关非线性主动控制

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摘要

Human-induced floor vibrations can be mitigated by means of active control via an electromagnetic proof-mass actuator. Previous researchers have developed a system for floor vibration comprising linear velocity feedback control (LVFC) with a command limiter (saturation in the command signal to avoid actuator overloading). The performance of this control is highly dependent on the linear gain utilised, which has to be designed for a particular excitation and might not be optimum for other excitations. This work explores the use of on-off nonlinear velocity feedback control (NLVFC) as the natural evolution of LVFC when high gains and/or significant vibration level are present together with saturation in the control law. Firstly, the describing function tool is employed to analyse the stability properties of: (1) LVFC with saturation, (2) on-off NLVFC with a dead zone and (3) on-off NLVFC with a switching-off function. Particular emphasis is paid to the resulting limit cycle behaviour and the design of appropriate dead zone and switching-off levels to avoid it. Secondly, experimental trials using the three control laws are conducted on a laboratory test floor. The results corroborate the analytical stability predictions. The pros of on-off NLVFC are that no gain has to be chosen and maximum actuator energy is delivered to cancel the vibration. In contrast, the requirement to select a dead zone or switching-off function provides a drawback in its application.
机译：人为引起的地板振动可以通过电磁质量检测执行器的主动控制来减轻。先前的研究人员已经开发了一种用于地板振动的系统，该系统包括带有命令限制器（命令信号中的饱和度，以避免执行器过载）的线性速度反馈控制（LVFC）。该控制的性能高度依赖于所利用的线性增益，该线性增益必须针对特定的激励进行设计，而对于其他激励可能不是最佳的。这项工作探索了在控制律中存在高增益和/或显着振动水平以及饱和的情况下，使用开-关非线性速度反馈控制（NLVFC）作为LVFC的自然演变的问题。首先，使用描述函数工具来分析以下特性的稳定性：（1）具有饱和的LVFC，（2）具有死区的开关NLVFC，以及（3）具有关断功能的开关NLVFC。特别要注意的是由此产生的极限循环行为以及为避免这种情况而设计的适当死区和关断电平。其次，在实验室测试平台上使用三种控制律进行了试验。结果证实了分析稳定性的预测。 NLVFC开关的优点是无需选择增益，并且可以提供最大的执行器能量来消除振动。相反，选择盲区或关断功能的要求在其应用中存在缺点。

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  • 来源
    《Mechanical systems and signal processing》 |2010年第6期|P.1711-1726|共16页
  • 作者

    Ivan M. Diaz; Paul Reynolds;

  • 作者单位

    Escuela Tecnica Superior de Ingenieros Industriales, Universidad de Castilla-La Mancha, Edificio Politecnica, Av. Camilo Jose Cela s, 13071 Ciudad Real, Spain Department of Civil and Structural Engineering, The University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield S1 3JD, United Kingdom;

    Department of Civil and Structural Engineering, The University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield S1 3JD, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    active control; structural control; floor vibrations; nonlinear velocity feedback; human-induced vibrations;

    机译：主动控制;结构控制;地板振动;非线性速度反馈;人为振动;

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