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: Passive and Active Vibration Control by Confinement: An Overview
Author: Daryoush Allaei (QRDC, Inc.)
Today's common practices to control structural noise and vibrations are based on the use of a set of actuators with appropriate time-varying magnitudes which are usually controlled based on the displacement, velocity, and/or acceleration vectors measured over the span of the structure. Though sensors, actuators, control algorithms, and computers have reached a state such that sophisticated active vibration control systems are at least possible, the question of which type of actuator (or even sensor) to use is still vexing. In many cases, structures deal with large forces, accelerations, velocities, and displacements and therefore, there are questions as how to generate counteracting forces efficiently, reliably, and at acceptable financial and energy costs. The actuators should also provide a sufficient amount of damping to dissipate any excess energy. In spite of such a large effort in the research community, the full potential of active vibration and noise control systems has not yet been realized because of the limitations on available sensors, actuators, affordable power supplies, and efficient control algorithms that can optimally manipulate the collected data and issue actuation assignments to achieve the required performance. Two of the main reasons why the implementation of active noise/vibration systems has been relatively slow are their energy consumption and high price. In other words, it is desired to solve vibration isolation and suppression problems without requiring unrealistic hardware performance or costs which outweigh the benefits. In recent years, it has been shown that, for certain class of structures, a noise/vibration control approach based on the mode localization phenomenon and/or vibrational energy confinement may address some of the above issues and significantly improve the overall benefits of the noise/vibration control systems. The idea is to design vibration control systems with the least power, weight, and cost penalty. The purpose of this paper is to present an overview of the advances in the application of the mode localization phenomenon and vibrational energy confinement to passive and active noise and vibration control problems. Both basic and applied research papers are discussed. Based on the reviewed work, it is concluded that the concept of vibration control by confinement can overcome some of the shortcomings in the present passive and active noise and vibration control technologies. The latter has been demonstrated under laboratory conditions in several recent papers.
Abstract
Title: Passive and Active Vibration Control by Confinement: An Overview
Author: Daryoush Allaei (QRDC, Inc.)
Today's common practices to control structural noise and vibrations are based on the use of a set of actuators with appropriate time-varying magnitudes which are usually controlled based on the displacement, velocity, and/or acceleration vectors measured over the span of the structure. Though sensors, actuators, control algorithms, and computers have reached a state such that sophisticated active vibration control systems are at least possible, the question of which type of actuator (or even sensor) to use is still vexing. In many cases, structures deal with large forces, accelerations, velocities, and displacements and therefore, there are questions as how to generate counteracting forces efficiently, reliably, and at acceptable financial and energy costs. The actuators should also provide a sufficient amount of damping to dissipate any excess energy. In spite of such a large effort in the research community, the full potential of active vibration and noise control systems has not yet been realized because of the limitations on available sensors, actuators, affordable power supplies, and efficient control algorithms that can optimally manipulate the collected data and issue actuation assignments to achieve the required performance. Two of the main reasons why the implementation of active noise/vibration systems has been relatively slow are their energy consumption and high price. In other words, it is desired to solve vibration isolation and suppression problems without requiring unrealistic hardware performance or costs which outweigh the benefits. In recent years, it has been shown that, for certain class of structures, a noise/vibration control approach based on the mode localization phenomenon and/or vibrational energy confinement may address some of the above issues and significantly improve the overall benefits of the noise/vibration control systems. The idea is to design vibration control systems with the least power, weight, and cost penalty. The purpose of this paper is to present an overview of the advances in the application of the mode localization phenomenon and vibrational energy confinement to passive and active noise and vibration control problems. Both basic and applied research papers are discussed. Based on the reviewed work, it is concluded that the concept of vibration control by confinement can overcome some of the shortcomings in the present passive and active noise and vibration control technologies. The latter has been demonstrated under laboratory conditions in several recent papers.
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