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: An Innovative Technique to Optimize Performance of Passive and Active Damping Elements
Author: Daryoush Allaei (QRDC, Inc.), Yin-Tsan Shih (QRDC, Inc), and David Tarnowski (QRDC, Inc.)
In this paper an innovative technique to optimize the performance of passive and active damping elements is introduced. The concept is based on the optimum combination of two powerful and complementary methods, namely Vibration Control by Confinement (VCC) and Concentrated Damping Elements (CDE). The effectiveness of VCC-CDE method is examined by considering the vibration suppression of two structures. The first one is composed of a component resting on its supporting structure. The performance of three most common vibration control methods are then compared to that of VCC. The second example is the suppression of selected modes of a simply supported plate subjected to transient and harmonic excitations. In this case, the VCC-CDE is compared with the plate treated with constrained layered damping. The finite element method is employed to model both structures and the modal expansion approach is utilized to generate the forced vibration responses. Results show that, contrary to the current methods, VCC is effective over a wide frequency range and its performance is not resonance dependent. Furthermore, it is demonstrate that the VCC-CDE is an efficient and viable approach that offers a much higher performance with less added damping material when compared with conventional layer damping techniques.
Abstract
Title: An Innovative Technique to Optimize Performance of Passive and Active Damping Elements
Author: Daryoush Allaei (QRDC, Inc.), Yin-Tsan Shih (QRDC, Inc), and David Tarnowski (QRDC, Inc.)
In this paper an innovative technique to optimize the performance of passive and active damping elements is introduced. The concept is based on the optimum combination of two powerful and complementary methods, namely Vibration Control by Confinement (VCC) and Concentrated Damping Elements (CDE). The effectiveness of VCC-CDE method is examined by considering the vibration suppression of two structures. The first one is composed of a component resting on its supporting structure. The performance of three most common vibration control methods are then compared to that of VCC. The second example is the suppression of selected modes of a simply supported plate subjected to transient and harmonic excitations. In this case, the VCC-CDE is compared with the plate treated with constrained layered damping. The finite element method is employed to model both structures and the modal expansion approach is utilized to generate the forced vibration responses. Results show that, contrary to the current methods, VCC is effective over a wide frequency range and its performance is not resonance dependent. Furthermore, it is demonstrate that the VCC-CDE is an efficient and viable approach that offers a much higher performance with less added damping material when compared with conventional layer damping techniques.
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