TECHNOLOGY & PATENTS:
Vibration Control by Confinement (VCC)
Energy Flow Control (EFC)
USA and International Patents
- 14 years of government and commercial projects
- 13 U.S. and international patents
- Expertise in noise/vibration/acoustics/shock analysis and control
- Capabilities in modeling simulation and analysis
- Capabilities in testing and evaluation
- Capabilites in field data collection and analysis
- Ability to secure government funds for R&D projects ($2.5 billion funding pool)
- Ability to secure sole source phase 3 awards
Publications
Abstract
Title: Enhancing the Performance of Constrained Layer Damping by Confining Vibrational Energy
Author: David Tarnowski (QRDC, Inc.) and Daryoush Allaei (QRDC, Inc.)
A feasibility study was conducted to demonstrate that the combination of Constrained Layer Damping (CLD) and Vibration Control by Confinement (VCC) is an effective and viable approach to today's noise and vibration problems. The objective of this paper is to report on the degree of improvement of CLD when used in conjunction with VCC. Two panel-type structures, resembling a simplified model of the panel section of a car door, are examined. The entire upper surface of the first panel was covered by CLD. On the other hand, only 63% of the second panel is covered by CLD. A confining rib was added to the second panel to localize the vibrational energy to the remaining 37% of its surface over which no CLD was added. The finite element method was employed to model both structures and generate the numerical results presented in this article. Four equally distributed points were identified to excite and measure the response. The plate was subjected to transient and harmonic excitations. Our preliminary results clearly show that not only VCC can be used as a stand-alone mechanism to suppress or isolate vibrations but also can be combined with CLD to significantly improve performance. Furthermore, additional ramifications of the VCC approach as they apply to passive or active vibration control systems are discussed.
Abstract
Title: Enhancing the Performance of Constrained Layer Damping by Confining Vibrational Energy
Author: David Tarnowski (QRDC, Inc.) and Daryoush Allaei (QRDC, Inc.)
A feasibility study was conducted to demonstrate that the combination of Constrained Layer Damping (CLD) and Vibration Control by Confinement (VCC) is an effective and viable approach to today's noise and vibration problems. The objective of this paper is to report on the degree of improvement of CLD when used in conjunction with VCC. Two panel-type structures, resembling a simplified model of the panel section of a car door, are examined. The entire upper surface of the first panel was covered by CLD. On the other hand, only 63% of the second panel is covered by CLD. A confining rib was added to the second panel to localize the vibrational energy to the remaining 37% of its surface over which no CLD was added. The finite element method was employed to model both structures and generate the numerical results presented in this article. Four equally distributed points were identified to excite and measure the response. The plate was subjected to transient and harmonic excitations. Our preliminary results clearly show that not only VCC can be used as a stand-alone mechanism to suppress or isolate vibrations but also can be combined with CLD to significantly improve performance. Furthermore, additional ramifications of the VCC approach as they apply to passive or active vibration control systems are discussed.
125 Columbia Court, Suite 6, Chaska, MN 55318
phone 952.556.5205 | fax 952.556.5206
email arash@qrdc.com
phone 952.556.5205 | fax 952.556.5206
email arash@qrdc.com