Journal ArticleDOI
Active control of sound and vibration
Chris R. Fuller,A.H. von Flotow +1 more
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TLDR
In this article, the authors overview the active sound and vibration control field, first by putting it into a historical context, then by outlining the relevant control theory and implementations, and finally by describing some current practical applications.Abstract:
In many industrial and defense applications noise and vibration are important problems. The conventional method of treatment is to use passive damping techniques or to redesign the system. However, passive damping techniques are primarily effective at higher frequencies, and redesign is often costly and ineffective. In the last decade, active control of sound and vibration (at audio frequencies) has emerged as a viable technology to bridge this low-frequency technology gap. Recent developments have been propelled by the rapid technology growth in affordable and practical digital signal processing chips and, to a smaller degree, improvements in control transducers. In this article the authors overview the active sound and vibration control field, first by putting it into a historical context, then by outlining the relevant control theory and implementations, and finally by describing some current practical applications.read more
Citations
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Journal ArticleDOI
A globally convergent frequency estimator
Liu Hsu,Romeo Ortega,Gilney Damm +2 more
TL;DR: The authors propose a new adaptive notch filter whose dynamic equations exhibit the following remarkable features: all signals are globally bounded and the estimated frequency is asymptotically correct for all initial conditions and all frequency values.
Journal ArticleDOI
Review: A review of active structural control: challenges for engineering informatics
TL;DR: An active structure is an engineering structure containing sensors and actuators that, when active, modify the response of the structure to its environment as discussed by the authors, and it is a type of structural control that can be used in extreme environments (space, undersea, polar), contaminated contexts (nuclear, chemical, biological).
Journal ArticleDOI
Acoustic noise during functional magnetic resonance imaging.
TL;DR: The frequency content and timing of the most intense noise components indicated that the noise was primarily attributable to the readout gradients in the imaging pulse sequence, and knowledge of the sources and characteristics of the noise enabled the examination of general approaches to noise control that could be applied to reduce the unwanted noise during fMRI sessions.
Book
Understanding Active Noise Cancellation
TL;DR: 1. Language study and standard English in secondary English teaching, and what it means to be a Reflective Practitioner.
Journal ArticleDOI
A method of extraction of nonstationary sinusoids
A. K. Ziarani,A. Konrad +1 more
TL;DR: A novel method of extraction of nonstationary sinusoidal signals and estimation of their parameters, namely amplitude, phase and frequency is presented and is shown to have a very simple structure which renders it suitable for both software and hardware implementation.
References
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Book
Adaptive Signal Processing
Bernard Widrow,Samuel D. Stearns +1 more
TL;DR: This chapter discusses Adaptive Arrays and Adaptive Beamforming, as well as other Adaptive Algorithms and Structures, and discusses the Z-Transform in Adaptive Signal Processing.
Book
Adaptive Control
TL;DR: Benefiting from the feedback of users who are familiar with the first edition, the material has been reorganized and rewritten, giving a more balanced and teachable presentation of fundamentals and applications.
Journal ArticleDOI
Active Control of Sound
TL;DR: This book brings together results from research in the two disciplines of acoustics and signal processing and presents the fundamentals of noise control in a unified manner and focuses on algorithmic principles which form the foundation of practical systems.
Book
Active Control of Vibration
TL;DR: In this article, the authors present a general analysis of active structural acyclic control (ASAC) for plate systems, including the use of piezoelectric error sensors in ASAC.