Phase Delay Control of a Cantilever Beam

Hwang, Jin‐Tae; Choi, Chong‐Ho; Song, Chul Ki

doi:10.1177/107754630000600206

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…Increasing the delay time allows for this issue to be corrected so that the applied voltage (dot–dash green line) is 180 degrees out of phase with the tip displacement and thus acts to attenuate the vibrations within the link. Previous research conducted by Hwang et al. (1998) supports this finding.…”

Section: Avcsupporting

confidence: 78%

Active vibration control using piezoelectric actuators employing practical components

Williams

Khodaparast

Jiffri

et al. 2019

Journal of Vibration and Control

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Unwanted vibrations are a common occurrence within structures and systems, and often pose a threat to their integrity or functionality. This research aims to seek a solution to attenuate the vibrations experienced within a link of a system using active vibration control with piezoelectric patches as actuators, whilst avoiding the use of large and expensive equipment which would contravene with the common objective of maintaining the smallest mass possible of the system. Previous research has employed large and expensive equipment as the controller, with sensors often only being able to measure the vibrations of the structure along one axis; this research aims to address these issues. The choice of utilizing the small, lightweight, and low-cost Raspberry Pi 3 combined with petite, mountable sensors and actuators was made based upon the greater practicality that the controller, sensors, and actuators exhibit, allowing for their use in a wide variety of applications. An analytical model of the structure was created based on Euler–Bernoulli beam theory and validated through the modal parameters and the frequency response obtained from a finite element model and experimental data. A controller was then designed and applied to the analytical model to attenuate the vibrations along the link, and then the same design was implemented within the Raspberry Pi 3, and experimental studies were carried out. The introduction and effectiveness of a purposeful time delay within the controller was explored within the experimental and analytical studies, with the intention of counteracting unfavorable results produced by the control system. The results of the experiment proved the control design to be effective for a range of frequencies that included the first natural frequency of the link, and validated the analytical model including the control design.

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Section: Avcsupporting

confidence: 78%

Active vibration control using piezoelectric actuators employing practical components

Williams

Khodaparast

Jiffri

et al. 2019

Journal of Vibration and Control

View full text Add to dashboard Cite

show abstract

“…In another research, the optimal control was combined with PPF in order to design the controller [12]. In addition, PPF has been combined with delayed feedback to design a more robust controller [13,14]. The idea was to use international time delays that may be large when compared with the natural periods of the structure.…”

Section: Introductionmentioning

confidence: 99%

Vibration control of piezoelectrically actuated microcantilevers

Mahmoodi

Ahmadian

2009

SPIE Proceedings

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The vibration control of microelectromechanical structures is an interesting and challenging research area that is extensively applicable in micro-mass measurement, micro-sensors and micro-mirror control. An active vibration control technique based on positive position feedback method is constructed in this paper. This method is used to control the vibration of microcantilevers through actuation of a piezoelectric layer that covers one side of the microcantilever. The modified version of positive position feedback used in this paper, employs a second order compensator for vibration suppression, and a first order compensator provides damping. Since the positive position feedback control is based on strain sensing approach, it is extensively applied to piezoelectrically controlled microcantilevers. Similar to conventional positive position feedback, stability conditions are global and independent of the dynamical characteristics of the open-loop system. Root locus diagrams are used to find proper compensator frequency and damping of the closed loop system. A numerical simulation is performed to evaluate the performance of the modified positive position feedback for both steady-state and transient dynamic control. The results indicate that the proposed method is more effective in controlling both steady-state and transient dynamics than conventional positive position feedback.

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“…His results are known in chronometry as the Airy theorem. Other authors (see reference [7] for example) emphasized the importance that phase shift plays in self-sustained oscillating systems, but mostly from the point of view of oscillation suppression [8]. The problem of phase control has assumed new signi"cance with the expansion of power semiconductors giving new possibilities for synthesis of electro-mechanical self-sustaining vibratory machines.…”

Section: Introductionmentioning

confidence: 99%