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: Vibration Control by Confinement: An Overview
Author: Daryoush Allaei (QRDC, Inc.)
Based on a review of the related literature, the first set of articles on the occurrence of the phenomenon of mode localization were published in late 1950's. The phenomenon was first explored in the area of solid-state physics. Small irregularities in a periodic lattice were reported to cause confinement of energy. In early 1970's, almost twenty years later, the phenomenon was reported to occur in periodic or cyclic structures when they were subjected to small aberrations causing them to become nearly periodic disordered structures. Even though the applicability of the mode localization to vibration control was discussed in mid 1980's, it was not until early 1990's when the effects of randomly occurring mode localization in periodic structures became a main area of study among researchers. The viability of the mode localization for vibration suppression and vibration control has also been explored by many researchers. Now, the main question is whether passive and/or active vibration control by confinement has the potential to become an alternative or complementary approach to the current noise and vibration control schemes. The purpose of this paper is to present an overview of the advances in this field by presenting a brief summary of the past, present, and its future directions. Both basic and applied research papers are discussed and a comprehensive related bibliography is presented. It is shown that the concept of vibration control by confinement can overcome some of the shortcomings in the present active noise and vibration control.
Abstract
Title: Vibration Control by Confinement: An Overview
Author: Daryoush Allaei (QRDC, Inc.)
Based on a review of the related literature, the first set of articles on the occurrence of the phenomenon of mode localization were published in late 1950's. The phenomenon was first explored in the area of solid-state physics. Small irregularities in a periodic lattice were reported to cause confinement of energy. In early 1970's, almost twenty years later, the phenomenon was reported to occur in periodic or cyclic structures when they were subjected to small aberrations causing them to become nearly periodic disordered structures. Even though the applicability of the mode localization to vibration control was discussed in mid 1980's, it was not until early 1990's when the effects of randomly occurring mode localization in periodic structures became a main area of study among researchers. The viability of the mode localization for vibration suppression and vibration control has also been explored by many researchers. Now, the main question is whether passive and/or active vibration control by confinement has the potential to become an alternative or complementary approach to the current noise and vibration control schemes. The purpose of this paper is to present an overview of the advances in this field by presenting a brief summary of the past, present, and its future directions. Both basic and applied research papers are discussed and a comprehensive related bibliography is presented. It is shown that the concept of vibration control by confinement can overcome some of the shortcomings in the present active noise and vibration control.
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