Noise-Controlling Casings offers a range of feasible noise-controlling strategies for different kinds of devices generating excessive noise. Depending on the required performance and the availability of energy sources, three solution categories are presented: passive (no external energy is needed, but performance is limited), semi-active (little energy is needed, but performance achieves higher values) and active (best performance, but an external energy source is needed). Two very important benefits of these proposed solutions are global noise reduction (in an entire enclosure or the surrounding space) and compact technology (contrary to other active noise control solutions requiring a large number of secondary sources and distributed sensors). Many of the solutions presented are original approaches by the authors, their own developed concepts and new elements and designs that have gained recognition in prestigious journals. The book provides a theoretical background to the research, looking at system configurations, mathematical modelling, signal processing implementation and numerical analysis.
The proposed ideas can be applied to any devices provided they have casings of thin walls or they can be enclosed by casings of thin walls. Applications include industrial devices, household appliances, vehicle or aircraft cabins and more.
This book will be of interest to professionals and students in the fields of acoustics, vibration, signal processing, control, automotive and aircraft engineering.
Author(s): Marek Pawelczyk, Stanislaw Wrona
Publisher: CRC Press
Year: 2022
Language: English
Pages: 277
City: Boca Raton
Cover
Half Title
Title Page
Copyright Page
Dedication
Contents
Preface
Contributors
Chapter 1: Introduction
1.1. Noise in the modern world
1.2. Noise reduction methods
1.3. Noise-controlling casing
1.4. Objectives and scope of the book
Chapter 2: Considered types of casings
2.1. Introduction
2.2. Rigid casing
2.2.1. Actuators and sensors
2.2.2. Secondary paths analysis
2.3. Lightweight casing
2.3.1. Actuators and sensors
2.3.2. Frequency response functions
2.3.3. Secondary paths analysis
2.4. Real casing
2.5. Summary
Chapter 3: Modelling of casings
3.1. Introduction
3.2. Analytical modelling of individual casing walls
3.2.1. Kirchhoff-Love plate theory
3.2.2. Mindlin-Reissner plate theory
3.3. Analytical modelling of the whole casing
3.3.1. Single-panel rigid casing
3.3.2. Double-panel rigid casing
3.3.3. Lightweight casing
3.4. Numerical modelling
3.4.1. Numerical simulations of a single plate
3.4.2. Numerical simulations of an active casing
3.5. Validation of selected models
3.5.1. Rigid casing walls
3.5.2. Lightweight casing walls
3.6. Summary
Chapter 4: Passive control
4.1. Introduction
4.2. Shaping of structural and acoustic responses
4.2.1. Optimization algorithm
4.2.2. Objective functions
4.2.3. Results
4.3. Passive shunt systems
4.3.1. Hardware platform
4.3.2. Control structure
4.3.3. Control results
4.4. Composite structures
4.4.1. Functionally graded materials
4.4.2. Hybrid composites
4.5. Summary
Chapter 5: Semi-active control
5.1. Introduction
5.2. Switched mechanical links for double panels
5.2.1. Hardware platform
5.2.2. Control algorithm
5.2.3. Control results
5.3. Coil-based links for double panels
5.3.1. Hardware platform
5.3.2. Control algorithm
5.3.3. Control results
5.4. Mass moment of inertia actuator
5.4.1. Hardware platform
5.4.2. Control algorithm
5.4.3. Control results
5.5. Semi-active shunt systems
5.5.1. Hardware platform
5.5.2. Control algorithm
5.5.3. Control results
5.6. Summary
Chapter 6: Active control systems
6.1. Introduction
6.2. Hardware platform
6.2.1. Optimization of actuators arrangement
6.2.2. Optimization of error microphones
6.2.3. Control unit
6.3. Control structures
6.3.1. Feedforward control
6.3.2. Acoustic feedback
6.3.3. Feedback control
6.3.4. Virtual microphone control
6.4. Adaptive control algorithms
6.4.1. The Least Mean Square algorithm
6.4.2. Stability of the LMS-family algorithms
6.4.3. Fast implementations
6.4.4. Multichannel implementations
6.5. Summary
Chapter 7: Summary
Appendix A: Stiffness matrix elements
Appendix B: Mass matrix elements
References
Index
