Light weight polarized polypropylene foam for noise shielding

Travis J. Zelfer; Derik S. Warne; Umesh A. Korde

doi:10.1117/12.815254

6 April 2009 Light weight polarized polypropylene foam for noise shielding

Travis J. Zelfer, Derik S. Warne, Umesh A. Korde

Proceedings Volume 7288, Active and Passive Smart Structures and Integrated Systems 2009; 728820 (2009) https://doi.org/10.1117/12.815254
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

The high levels of noise generated during launch can destroy sensitive equipment on space craft. Passive damping systems, like acoustic blankets, work to reduce the high frequency noise but do little to the low frequency noise (<400 Hz). While wall mounted transducers can reduce the low frequency noise during a launch, they also can create areas of higher increased sound pressure in the payload fairings. Ferroelectret cellular polymer foams with high piezoelectric coupling constants are being used as new types of actuators and sensors. Further impedance control through the inverse piezoelectric effect will lead to a new "semi-active" approach that will reduce low frequency noise levels. Combining layers of conventional nonpiezoelectric foam and ferroelectret materials with a multiple loop feedback system will give a total damping effect that is adaptable over a wide band of low frequencies. This paper covers the manufacturing methods that were used to make polarized polypropylene foam, to test the foam for its polarized response and its noise shielding ability.

Citation Download Citation

Travis J. Zelfer, Derik S. Warne, and Umesh A. Korde "Light weight polarized polypropylene foam for noise shielding", Proc. SPIE 7288, Active and Passive Smart Structures and Integrated Systems 2009, 728820 (6 April 2009); https://doi.org/10.1117/12.815254

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