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The effect and design of time delay in feedback control for a nonlinear isolation system

机译:时滞在非线性隔离系统反馈控制中的作用及设计

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摘要

The optimum value of time delay of active control used in a nonlinear isolation system for different types of external excitation is studied in this paper. Based on the mathematical model of the nonlinear isolator with time-delayed active control, the stability, response and displacement transmissibility of the system are analyzed to obtain the standards for appropriate values of time delay and control strengths. The effects of nonlinearity and time delay on the stability and vibration response are discussed in details. For impact excitation and random excitation, the optimal value of time delay is obtained based on the vibration dissipation time via eigenvalues analysis, while for harmonic excitation, the optimal values are determined based on multiple vibration properties including natural frequency, amplitude death region and effective isolation region by the Averaging Method. This paper establishes the relationship between the parameters and vibration properties of a nonlinear isolation system which provides the guidance for optimizing time-delayed active control for different types of excitation in engineering practices.
机译:研究了非线性隔离系统中不同类型的外部励磁系统中主动控制的时延最优值。基于具有时滞主动控制的非线性隔离器的数学模型,分析了系统的稳定性,响应和位移传递性,从而获得了适当的时延值和控制强度的标准。详细讨论了非线性和时间延迟对稳定性和振动响应的影响。对于冲击激励和随机激励,通过特征值分析根据振动消散时间获得最佳时延值;对于谐波激励,根据固有频率,振幅死区和有效隔离等多种振动特性确定最佳时延值。平均法计算区域。本文建立了非线性隔离系统的参数与振动特性之间的关系,为在工程实践中优化针对不同类型励磁的时滞主动控制提供了指导。

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