Resonance suppression through variable stiffness and damping mechanisms

Henri P. Gavin; Nitin S. Doke

doi:10.1117/12.348688

18 May 1999 Resonance suppression through variable stiffness and damping mechanisms

Henri P. Gavin, Nitin S. Doke

Proceedings Volume 3671, Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways; (1999) https://doi.org/10.1117/12.348688
Event: 1999 Symposium on Smart Structures and Materials, 1999, Newport Beach, CA, United States

Abstract

This paper describes the modifications in the dynamic behavior of a building structure when devices with variable stiffness and damping are installed in parallel with a low- damping isolation system. The results of eigen-value analyses of linear-elastic structural models with varying degrees of isolation stiffness and damping direct the subsequent design of a semi-active deice. A hydraulic semi- active actuator is designed to minimize an H₂ norm of the closed loop system. Details regarding the energy storage mechanisms of the device are retained in the device model. The energy dissipation mechanisms are idealized to be viscous in nature. The actuator behaves essentially as a visco-elastic Maxwell element with a variable damping coefficient. The response time of the control-valve mechanism in this actuator is studied to reveal the relative benefits of a valve that is fast to open and valve that is fast to close. Device parameters that result in a variable damping and variable damping and variable stiffness properties are given. A model-independent, bang-bang, control rule is employed to illustrate the closed loop control system when variable damping and variable stiffness embodiments are deployed. Rules governing the placement of device with this control rule are given when the device is primarily dissipative.

Citation Download Citation

Henri P. Gavin and Nitin S. Doke "Resonance suppression through variable stiffness and damping mechanisms", Proc. SPIE 3671, Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways, (18 May 1999); https://doi.org/10.1117/12.348688

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available