Positive Stage Jerk Feedback Combined with Positive Base Plate Jerk Feedback to Improve the Positioning Speed of a Pneumatic Stage

Abstract

In this paper, a unidirectional positioning stage which is supported by four coil-type spring isolators and actuated by four pneumatic cylinders is considered. The stage jerk feedback scheme (SJFB) with positive polarity is proposed to reduce the stage mass, resulting in the improvement of positioning speed. However, reduction of stage mass results in the overshoot that can be controlled by increasing the stage stiffness through the outer feedback loop controller. In addition, to avoid the selfoscillation of stage caused by high gain of SJFB and to improve the repeatability, the conventionally used scheme, namely, base plate jerk feedback (BPJFB) with positive polarity based on its damping role is combined with the SJFB scheme. It is concluded from the experimental results that the proposed control system obeys the related theory and provides high speed positioning with improved repeatability. The amount of the reduced mass through SJFB scheme is also experimentally estimated.

Reinterpretation of PDD² compensator embedded in position control for pneumatic stage

“…For this reason, it is proposed to speed up positioning by means of local feedback. Specifically, pressure feedback (Wakui and Tada, 2008) to compensate for the slowness of the pneumatic system due to compressibility of the air, and positive stage jerk feedback (Wali and Wakui, 2013) to compensate for that of the mechanical system due to the stage weight have been proposed, and their effects are confirmed. However, when either the pneumatic stage or PDD 2 compensator has a slow response, the response of the control system becomes slow.…”

Control Structure with Dual Acceleration Feedback for Positioning Machine with Semi-Closed Servo System

“…We previously proposed controllers of load-side acceleration feedback (LSAFB) (13) and machine stand acceleration feedback (MSAFB) (14) . The relative acceleration is used for vibration suppression (15) , and positive stage jerk feedback is combined with positive base plate jerk feedback for high-speed positioning of a pneumatic stage (16) . However, for certain industrial applications, practical phenomena, such as rocking mode vibration and local resonance, should be considered at the same time.…”

Implementation of model following control for a pneumatic stage: Improvement of repeatability and positioning speed

“…Authors' previous works [3], [4] proposed base plate jerk feedback control scheme so as to achieve high-speed positioning. In this method, the jerk signal, which is obtained by differentiating the base plate acceleration, is used to reduce effects of the reaction force caused by positioning.…”