초록 ▼

In a closed loop control system that governs the movement of an actuator a filter is provided that attenuates the oscillations generated by the actuator when the actuator is at a resonant frequency. The filter is preferably coded into the control system and includes the following steps. Sensing the

In a closed loop control system that governs the movement of an actuator a filter is provided that attenuates the oscillations generated by the actuator when the actuator is at a resonant frequency. The filter is preferably coded into the control system and includes the following steps. Sensing the position of the actuator with an LVDT and sensing the motor position where motor drives the actuator through a gear train. When the actuator is at a resonant frequency, a lag is applied to the LVDT signal and then combined with the motor position signal to form a combined signal in which the oscillation generated by the actuator are attenuated. The control system then controls ion this combined signal. This arrangement prevents the amplified resonance present on the LVDT signal, from causing control instability, while retaining the steady state accuracy associated with the LVDT signal. It is also a characteristic of this arrangement that the signal attenuation will always coincide with the load resonance frequency of the system so that variations in the resonance frequency will not effectuate the effectiveness of the filter.

대표청구항 ▼

[ What is claimed is:] [1.]1. In a closed loop control system for controlling the movement of a structure, a method for filtering oscillations generated when said structure is at a resonant frequency comprising the steps of:(a) sensing a first parameter of said structure and generating a first signa

[ What is claimed is:] [1.]1. In a closed loop control system for controlling the movement of a structure, a method for filtering oscillations generated when said structure is at a resonant frequency comprising the steps of:(a) sensing a first parameter of said structure and generating a first signal thereof, said first parameter being sensitive to said oscillations;(b) sensing a second parameter that is isolated from said oscillations and generating a second signal thereof, there being a known relationship between said first and second parameters;(c) applying a lag to said first signal;(d) combining said first and second signal to form a third in which the oscillations in said first signal are attenuated; and(e) using said third signal in said control system.