Structural Damping and Vibration Control via Smart Sensors and Actuators

Garg, Devendra P.; Anderson, Gary L.

doi:10.1177/107754603031169

Cited by 8 publications

(7 citation statements)

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“…Structural control is classified into active and passive control systems. In general, active control by sensors and actuators automatically provides the structure with a response against disturbance (Garg and Anderson, 2003). Passive control dissipates only a part of the energy when associated with spoilers or dampers (Modi and Seto, 1998).…”

Section: Introductionmentioning

confidence: 99%

Downstream flat plate as the flow-induced vibration enhancer for energy harvesting

Maruai

Ali

Ismail

et al. 2017

Journal of Vibration and Control

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The prospect of harvesting energy from flow-induced vibration using an elastic square cylinder with a detached flat plate is experimentally investigated. The feasibility of flow-induced vibration to supply an adequate base excitation for micro-scale electrical power generation is assessed through a series of wind tunnel tests. The current test model of a single square cylinder is verified through a comparable pattern of vibration amplitude response with previous experimental study and two-dimensional numerical simulations based on the unsteady Reynolds averaged Navier–Stokes (URANS). In addition, a downstream flat plate is included in the wake of the square cylinder to study the effects of wake interference upon flow-induced vibration. A downstream flat plate is introduced as the passive vibration control to enhance the magnitude of flow-induced vibration and simultaneously increases the prospect of harvesting energy from the airflow. The study is conducted by varying the gap separation between the square cylinder and flat plate for 0.1≤ G/ D ≤3. The highest peak amplitude is observed for the gap G/ D = 1.2 with yrms/ D = 0.46 at UR = 17, which is expected to harvest ten times more energy than the single square cylinder. The high amplitude vibration response is sustained within a relatively broader range of lock-in synchronization. Meanwhile, for G/ D = 2 the vibration is suppressed, which leads to a lower magnitude of harvested energy. Contrarily, the amplitude response pattern for G/ D = 3 is in agreement with the single square cylinder. Hence, the flat plate has no significance to the wake interference of the square cylinder when the gap separation is beyond 3 D.

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Section: Introductionmentioning

confidence: 99%

Downstream flat plate as the flow-induced vibration enhancer for energy harvesting

Maruai

Ali

Ismail

et al. 2017

Journal of Vibration and Control

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“…Vibrations caused by the thermal effect and external excitation are also modeled as displacement or moment boundary conditions. The contribution of material damping to the piezoelectric control of a system without time delay in control function has been studied in the [8] and it was observed that neglecting natural damping leads to under-estimation of the structural behavior [12].…”

Section: Introductionmentioning

confidence: 99%

A time-delay equation: well-posedness to optimal control

Yildirim

Alkan

2016

Open Physics

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Abstract:In this paper, well-posedness, controllability and optimal control for a time-delay beam equation are studied. The equation of motion is modeled as a timedelayed distributed parameter system(DPS) and includes Heaviside functions and their spatial derivatives due to the finite size of piezoelectric patch actuators used to suppress the excessive vibrations based on displacement and moment conditions. The optimal control problem is defined with the performance index including a weighted quadratic functional of the displacement and velocity which is to be minimized at a given terminal time and a penalty term defined as the control voltage used in the control duration. Optimal control law is obtained by using Maximum principle and hence, the optimal control problem is transformed the into a boundary-, initial and terminal value problem.The explicit solution of the control problem is obtained by eigenfunction expansions of the state and adjoint variables. Numerical results are presented to show the effectiveness and applicability of the piezoelectric control.

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“…Airframe systems such as landing gear control and indication, and control surface position require various sensors for monitoring and control of airframe systems. The nonlinear vibration suppression technique was robust and efficient and it functioned with most sensors and actuators (Garg and Anderson, 2003). The size and location of the piezoelectric actuators are two issues to guarantee the highest energy efficiency and controllability of the system (Fariborzi et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Advanced control and communication scheme for aerospace applications

Logan¹,

Sankareswaran²,

Venugopal³

2014

Journal of Vibration and Control

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This article presents multiple channel estimation (MCE) that is a multi-sensor access wireless system model. An avionics wireless system needs a power control device to match the power received from the multiple sensors. Without a power control device, the aircraft control unit is unable to receive the signals from sensors due to signal reflections, refraction and transmission loss. The MCE system is designed to suppress multi-sensor signal noise and interference while a sensor, with lower power than the other sensors, is received. This article investigates overcome the power difference based on the MCE system. The performance of proposed MCE model is investigated and validated for a safe indoor avionics wireless system and it improves the overall performance of the wireless system to perfect power stability.

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Structural Damping and Vibration Control via Smart Sensors and Actuators

Cited by 8 publications

References 0 publications

Downstream flat plate as the flow-induced vibration enhancer for energy harvesting

Downstream flat plate as the flow-induced vibration enhancer for energy harvesting

A time-delay equation: well-posedness to optimal control

Advanced control and communication scheme for aerospace applications

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