This paper presents a novel concept in active pneumatic vibration isolation. The novelty in the concept is in utilizing an air-spring-orifice-accumulator combination to vary the natural frequency as well as inject damping into the system per requirement, thereby eliminating the need for a hydraulic cylinder or a magnetorheological damper. This continuously variable natural frequency and damping (CVNFD) technology is aimed at achieving active vibration isolation. For analysis purposes, a particular application in the form of pneumatic seat suspension for off-road vehicles is chosen. A mathematical model representing the system is derived rigorously from inertial dynamics and first principles in thermodynamics. Empirical corelations are also used to include nonlinearities such as friction that cannot be accounted for in the thermodynamic equations. An exhaustive computational study is undertaken to help understand the physics of the system. The computational study clearly depicts the CVNFD capability of the vibration isolation system. An experimental test rig is built to experimentally validate analytical and simulation modeling of the system. Experimental verification corroborated the variable natural frequency and damping characteristic of the system observed through computational simulations.
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e-mail: hporumam@calpoly.edu
e-mail: akelkar@iastate.edu
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May 2008
Research Papers
Modeling and Verification of an Innovative Active Pneumatic Vibration Isolation System
H. Porumamilla,
H. Porumamilla
Postdoc/Lecturer
Department of Mechanical Engineering,
e-mail: hporumam@calpoly.edu
Calpoly
, San Luis Obispo, CA 93410
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A. G. Kelkar,
A. G. Kelkar
Professor
Department of Mechanical Engineering,
e-mail: akelkar@iastate.edu
Iowa State University
, Ames, IA 50011
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J. M. Vogel
J. M. Vogel
Department of Aerospace Engineering,
Iowa State University
, Ames, IA 50011
Search for other works by this author on:
H. Porumamilla
Postdoc/Lecturer
Department of Mechanical Engineering,
Calpoly
, San Luis Obispo, CA 93410e-mail: hporumam@calpoly.edu
A. G. Kelkar
Professor
Department of Mechanical Engineering,
Iowa State University
, Ames, IA 50011e-mail: akelkar@iastate.edu
J. M. Vogel
Department of Aerospace Engineering,
Iowa State University
, Ames, IA 50011J. Dyn. Sys., Meas., Control. May 2008, 130(3): 031001 (12 pages)
Published Online: April 9, 2008
Article history
Received:
August 23, 2005
Revised:
March 26, 2007
Published:
April 9, 2008
Citation
Porumamilla, H., Kelkar, A. G., and Vogel, J. M. (April 9, 2008). "Modeling and Verification of an Innovative Active Pneumatic Vibration Isolation System." ASME. J. Dyn. Sys., Meas., Control. May 2008; 130(3): 031001. https://doi.org/10.1115/1.2807049
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