Smart vibration control analysis of seismic response using MR dampers in the elevated highway bridge structures

Satellites are subject to various severe vibration during different phases of flight. The concept of satellite smart adapter is proposed in this study to achieve active vibration control of launch vehicle on satellite. The satellite smart adapter has 18 active struts in which the middle section of each strut is made of piezoelectric stack actuator. Comprehensive conceptual design of the satellite smart adapter is presented to indicate the design parameters, requirements and philosophy applied which are based on the reliability and durability criterions to ensure successful functionality of the proposed system. The coupled electromechanical virtual work equation for the piezoelectric stack actuator in each active strut is drived by applying D'Alembert's principle. Modal analysis is performed to characterize the inherent properties of the smart adapter and extraction of a mathematical model of the system. Active vibration control analysis was conducted using fuzzy logic control with triangular membership functions and acceleration feedback. The control results conclude that the proposed satellite smart adapter configuration which benefits from piezoelectric stack actuator as elements of its 18 active struts has high strength and shows excellent robustness and effectiveness in vibration suppression of launch vehicle on satellite.

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Comments on the paper: ‘Seismic response of long curved bridge structures: Experimental model studies’

Earthquake Engineering & Structural Dynamics ◽

10.1002/eqe.4290080208 ◽

1980 ◽

Vol 8 (2) ◽

pp. 193-193

Author(s):

T. I. Campbell

Keyword(s):

Seismic Response ◽

Experimental Model ◽

Curved Bridge ◽

Model Studies ◽

Bridge Structures

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Vibration Control of a New Bed Stage System for Ambulance Using MR Dampers

Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation and Control of Adaptive Systems; Structural Health Monitoring; Keynote Presentation ◽

10.1115/smasis2014-7433 ◽

2014 ◽

Author(s):

Hee-Dong Chae ◽

Seung-bok Choi ◽

Jong-Seok Oh

Keyword(s):

Mathematical Model ◽

Vibration Control ◽

Vibration Isolation ◽

Design Parameters ◽

Ride Quality ◽

Vibration Level ◽

Mr Dampers ◽

Secondary Damage ◽

Stage System ◽

Magneto Rheological

This paper proposes a new bed stage for patients in ambulance vehicle in order to improve ride quality in term of vibration control. The vibration of patient compartment in ambulance can cause a secondary damage to a patient and a difficulty for a doctor to perform emergency care. The bed stage is to solve vertical, rolling, and pitching vibration in patient compartment of ambulance. Four MR (magneto-rheological) dampers are equipped for vibration isolation of the stage. Firstly, a mathematical model of stage is derived followed by the measurement of vibration level of patient compartment of real ambulance vehicle. Then, the design parameters of bed stage is undertaken via computer simulation. Skyhook, PID and LQR controllers are used for vibration control and their control performances are compared.

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