Local feedback control of light honeycomb panels
Chinsuk Hong1, Stephen J Elliott
1Institute of Sound and Vibration Research, University of Southampton, University Road, Southampton, Hampshire, S017 1BJ, United Kingdom. csh@isvr.soton.ac.uk
The Journal of the Acoustical Society of America
|February 15, 2007
Summary
Active control of sound radiation from aircraft honeycomb panels using piezoceramic actuators shows localized effects. Multichannel systems offer limited improvement due to reduced gain margins, impacting noise transmission control.
Area of Science:
- Acoustics and Materials Science
- Vibration Control Engineering
Background:
- Honeycomb panels are crucial for lightweight, stiff aircraft structures, requiring noise transmission control.
- Passive mounting reduces noise, but active control is explored for enhanced performance.
- Piezoceramic actuators offer a method for active sound radiation control.
Purpose of the Study:
- To investigate the feedback control of sound radiation from honeycomb panels using piezoceramic actuators.
- To analyze the impact of local sensor-actuator coupling on control performance.
- To explore the effectiveness of multichannel active control for global noise reduction.
Main Methods:
- Experimental observation and single degree-of-freedom modeling of local sensor-actuator coupling.
- Development and simulation of a 12-channel direct velocity feedback control system.
- Analysis of gain margins and performance localization in single- and multichannel systems.
Main Results:
- Local coupling between piezoceramic actuators and sensors was observed, limiting high-frequency response.
- Single-channel control resulted in localized noise reduction with high gain margins but poor global performance.
- Multichannel control predicted limited improvement due to decreased gain margins.
Conclusions:
- Local coupling effects in active control systems for honeycomb panels necessitate careful design.
- While multichannel control was investigated, significant global performance gains were not achieved.
- Further research may be needed to optimize multichannel strategies for effective aircraft noise reduction.
More Related Videos
09:00Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
Published on: October 27, 2017
08:17Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
Published on: May 25, 2016
Related Concept Videos
01:26Feedback control systems
Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
01:24Effects of feedback
Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
01:17Open and closed-loop control systems
Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal and...
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal and...
01:01Feedback Loops
In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.
01:18Positive and Negative Feedback Loops
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires maintaining an internal dynamic equilibrium:
01:10Control Systems
Control systems are everywhere in contemporary society, influencing diverse applications from aerospace to automated manufacturing. These systems can be found naturally within biological processes, such as blood sugar regulation and heart rate adjustment in response to stress, as well as in man-made systems like elevators and automated vehicles. A control system is essentially a network of subsystems and processes that collaboratively convert specific inputs into desired outputs.
At the heart...
At the heart...