Realization and Application of the Base Plate Jerk Feedback in a Pneumatic Positioning Stage

2013

JAMDSM

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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.

Section: Introductionmentioning

confidence: 83%

“…2. Where the mechanical system is modeled as a 2-DOF system due to the suspension of base plate on the coil-type spring isolators by neglecting the vertical motion (8)(9)(10)(11)(12) , for which the equations of motion are defined as follows:…”

Section: Proposed Control Block Diagram and Related Theorymentioning

confidence: 99%

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

Wali

2013

JAMDSM

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“…For this reason, the BPAccFB has been proposed as a competent control scheme. However, in the case of pneumatic stages, to control the horizontal vibration due to the reaction force, the base plate jerk feedback is further efficient after the driving mechanism is formed as a perfect integrator (7) .…”

Section: A Review On Control Of the Flow Disturbance And Horizontal Vmentioning

confidence: 99%

“…Subsequently, we concerned the dynamic situation of the base plate by using the coiltype spring isolators as the supporting mechanism (7) . To suppress the flow disturbance, a simple pressure difference feedback was conventionally used along with a PI compensator in front of the pneumatic system, based on Ref.…”

Section: Application Of the Bpjfb And Pdd 2 Compensatormentioning

confidence: 99%

See 1 more Smart Citation

Combination of the Flow Disturbance Observer and Base Plate Jerk Feedback in a Pneumatic Positioning Stage

Wali

2012

JSDD

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Pneumatic actuation systems are commonly used to drive the positioning stage due to several merits. However, one of the critical demerits of the pneumatic systems is the problem of the compressibility, which results in the flow disturbance. Another problem of the positioning stage can be addressed to the vibration which occurs due to the active condition of the base plate. This paper concerns the mentioned two issues in a pneumatic positioning stage. In order to suppress the flow disturbance and to reduce the horizontal vibration of the stage due to the reaction force, a combined control scheme is proposed. This scheme is composed of the fusion of flow disturbance observer (FDOB) and base plate jerk feedback (BPJFB) scheme. An enhanced experimental methodology is provided to successfully implement the fusion of the mentioned feedback controllers. The results show the effectiveness of the proposed method.

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

Ito

Proceedings of the 2014 International Conference on Advanced Mechatronic Systems

Nakamura

2014

Self Cite

In the control of a pneumatic positioning stage, two issues have to be considered. The first issue is the low repeatability caused by variation of parameters in pneumatic system. The second one is the slowness of response due to air compressibility. To overcome these issues, this paper presents the control methods for the pneumatic positioning stage. To compensate for the parameter variation and improve the repeatability, model following control (MFC) is employed. Moreover, to achieve the high-speed positioning, the feedforward (FF) control is utilized. Effectiveness of the MFC and the FF control is shown by experiments.