Active control of a distributed-parameter structure using vortex power flow confinement

1997 ◽  
Vol 102 (3) ◽  
pp. 1648-1656 ◽  
Author(s):  
Nobuo Tanaka ◽  
Yoshihiro Kikushima ◽  
Masaharu Kuroda ◽  
Neil J. Fergusson
Keyword(s):  
Active Control ◽  
Power Flow ◽  
Distributed Parameter

Active Performance Optimization of Cantilever Piezoelectric Energy Harvester

2014 ◽  
Author(s):  
M. Tavakkoli Anbarani ◽  
A. Alasty
Keyword(s):  
Resonance Frequency ◽  
Active Control ◽  
Piezoelectric Actuator ◽  
Performance Optimization ◽  
Energy Harvester ◽  
Distributed Parameter ◽  
Piezoelectric Energy ◽  
Significant Performance ◽  
Beam Type ◽  
Working Frequency

A Piezoelectric Energy Harvester (PEH) of cantilever beam type is developed to optimize the generated power by means of active control of moment of inertia of the beam. Distributed parameter equations of vibration of the beam are developed. Then the electromechanical response of the piezoelectric actuator is discussed. The harvester configuration is then described and it is shown that such a configuration can avoid the drastic power drop in presence of uncertainty around resonance frequency by applying voltage to the piezoelectric actuator. Finally the proposed harvester output power working frequency span is compared to conventional methods to show that the significant performance optimization in proposed method is achieved.

Dynamic Analysis of an Active Flexible Isolation System

2003 ◽  
Author(s):  
Kongjie Song ◽  
Lingling Sun ◽  
Yuguo Sun ◽  
Bing Zhang
Keyword(s):  
Active Control ◽  
Power Flow ◽  
Low Frequency ◽  
Coupled System ◽  
Isolation System ◽  
Active Isolation ◽  
Dynamic Modification ◽  
Mobility Method ◽  
Feed Forward Controller ◽  
Flexible Foundation

This paper is dedicated to the structure dynamic modification in an active isolation system supported by a flexible foundation, in order to improve the effectiveness of the active control strategy. The coupled vibration between machine-sprung and flexible foundation substructure is examined, using the subsystem mobility method. The vibration transmission in this coupled system is presented in terms of power flow. The interaction between structure controlled and the adaptive feed-forward controller is investigated theoretically. The numerical results show that: the location of the active mounts and the first mode frequency of the flexible foundation have evident influence on the effect of active control, especially at low-frequency band.

Experiments on the active control of flexural wave power flow

1987 ◽  
Vol 112 (1) ◽  
pp. 187-191 ◽  
Author(s):  
W. Redman-White ◽  
P.A. Nelson ◽  
A.R.D. Curtis
Keyword(s):  
Active Control ◽  
Power Flow ◽  
Flexural Wave ◽  
Wave Power

Mixed Skyhook and Power-Driven-Damper: A New Low-Jerk Semi-Active Suspension Control Based on Power Flow Analysis

2016 ◽  
Vol 138 (8) ◽  
Author(s):  
Yilun Liu ◽  
Lei Zuo
Keyword(s):  
Active Control ◽  
Power Flow ◽  
Flow Analysis ◽  
Linear Quadratic Regulator ◽  
Control Algorithms ◽  
Linear Quadratic ◽  
Active Suspensions ◽  
Switching Law ◽  
Suspension Control ◽  
Optimal Linear

In practice, semi-active suspensions provide better tradeoffs between performances and costs than passive or active damping. Many different semi-active control algorithms have been developed, including skyhook (SH), acceleration-driven-damper (ADD), power-driven-damper (PDD), mixed SH and ADD (SH-ADD), and others. Among them, it has been shown that the SH-ADD is quasi-optimal in reducing the sprung mass vibration. In this paper, we analyze the abilities of vehicular suspension components, the shock absorber and the spring, from the perspective of energy transfer between the sprung mass and the unsprung mass, and propose a new sprung mass control algorithm named mixed SH and PDD (SH-PDD). The proposed algorithm defines a switching law that is capable of mixing SH and PDD, and simultaneously carries their advantages to achieve a better suspension performance. As a result, the proposed SH-PDD is effective in reducing the sprung mass vibration across the whole frequency spectrum, similar to SH-ADD and much better than SH, PDD, and ADD, while eliminating the control chattering and high-jerk behaviors as occurred in SH-ADD. The superior characteristics of the SH-PDD are verified in numerical analysis as well as experiments. In addition, the proposed switching law is extended to mix other semi-active control algorithms such as the mixed hard damping and soft damping, and the mixed SH and clipped-optimal linear quadratic regulator (LQR).

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