Download or read book An Approach Using Active Structural Acoustic Control written by Hugo Douville and published by LAP Lambert Academic Publishing. This book was released on 2011-09 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete analysis of the structure-borne noise transmission paths of an automotive suspension assembly is presented. First, a fully-instrumented test bench consisting of a wheel/suspension/lower suspension A-arm assembly was de- signed in order to identify the vibro-acoustic transmission paths (up to 250 Hz) for white noise excitation of the wheel. Second, an analysis of the vibro-acoustics of the suspension is presented; an overview of the Frequency Response Functions (FRF) is introduced and their respective modal behaviors are described. Frequency response function measurements between the excitation signal and each suspen- sion/chassis linkages are used to characterize the di(r)erent transmission paths that transmit energy through the chassis of the car. Finally, a synthesis of the major modal contributions of the suspension is drawn, with the objective of indicating which suspension transfer paths contribute the most to the structural forces trans- mitted to the chassis. Modal transmissibility factors (MTF) were calculated to pro- vide an overall classi-cation of the modes to the vibration transmission through the individual suspension linkages and the orthogonal directions."

Download or read book An Approach Using Active Structural Acoustic Control for the Reduction of Structure borne Road Noise microform written by Hugo Douville and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Approach for Active Structural acoustic Control of a Fluid loaded Structure written by Urmas Ross and published by . This book was released on 1995 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Control of Noise and Structural Vibration written by Qibo Mao and published by Springer Science & Business Media. This book was released on 2013-06-02 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Control of Noise and Structural Vibration presents a MATLAB®-based approach to solving the problems of undesirable noise generation and transmission by structures and of undesirable vibration within structures in response to environmental or operational forces. The fundamentals of acoustics, vibration and coupling between vibrating structures and the sound fields they generate are introduced including a discussion of the finite element method for vibration analysis. Following this, the treatment of sound and vibration control begins, illustrated by example systems such as beams, plates and double walls. Sensor and actuator placement is explained as is the idea of modal sensor–actuators. The design of appropriate feedback systems includes consideration of basic stability criteria and robust active structural acoustic control. Positive position feedback (PPF) and multimode control are also described in the context of loudspeaker–duct and loudspeaker–microphone models. The design of various components is detailed including the analog circuit for PPF, adaptive (semi-active) Helmholtz resonators and shunt piezoelectric circuits for noise and vibration suppression. The text makes extensive use of MATLAB® examples and these can be simulated using files available for download from the book’s webpage at springer.com. End-of-chapter exercises will help readers to assimilate the material as they progress through the book. Control of Noise and Structural Vibration will be of considerable interest to the student of vibration and noise control and also to academic researchers working in the field. It’s tutorial features will help practitioners who wish to update their knowledge with self-study.

Download or read book Active Structural Acoustic Control as an Approach to Acoustic Optimization of Lightweight Structures written by Dirk Mayer and published by . This book was released on 2001 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional approaches to optimizing the acoustic behavior of lightweight structures have mainly been restricted to the concept of Active Noise Control(ANC). This concept is aimed to attenuating primary noise sources with secondary controlled noise sources by taking advantage of destructive interference. However it is also possible to actively control the vibrating structure using piezoceramic actuators to alter very intensively sound-radiating operating deflection shapes. This approach is referred to as Active Structural Acoustic Control (ASAC). The applicability of this concept to real systems is demonstrated by means of a simple model with experimental measurement systems employed in the lower frequency range. This study focuses on the utilization of a modern measurement technology i.e. the Spatial Transformation of Sound Fields(STSF) which facilitates the determination of important parameters of the vibro-acoustic system at a time. The radiation efficiency is of major importance to the evaluation of the acoustic system behavior. As the lower frequency range is considered the dynamic system behavior is determined by means of the Experimental Modal Analysis (EMA). The results of this study show the radiation efficiency of the unregulated and of the actively controlled system.

Download or read book Control of Noise and Structural Vibration written by Mao Qibo and published by Springer. This book was released on 2013-06-04 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Control of Noise and Structural Vibration presents a MATLAB®-based approach to solving the problems of undesirable noise generation and transmission by structures and of undesirable vibration within structures in response to environmental or operational forces. The fundamentals of acoustics, vibration and coupling between vibrating structures and the sound fields they generate are introduced including a discussion of the finite element method for vibration analysis. Following this, the treatment of sound and vibration control begins, illustrated by example systems such as beams, plates and double walls. Sensor and actuator placement is explained as is the idea of modal sensor–actuators. The design of appropriate feedback systems includes consideration of basic stability criteria and robust active structural acoustic control. Positive position feedback (PPF) and multimode control are also described in the context of loudspeaker–duct and loudspeaker–microphone models. The design of various components is detailed including the analog circuit for PPF, adaptive (semi-active) Helmholtz resonators and shunt piezoelectric circuits for noise and vibration suppression. The text makes extensive use of MATLAB® examples and these can be simulated using files available for download from the book’s webpage at springer.com. End-of-chapter exercises will help readers to assimilate the material as they progress through the book. Control of Noise and Structural Vibration will be of considerable interest to the student of vibration and noise control and also to academic researchers working in the field. It’s tutorial features will help practitioners who wish to update their knowledge with self-study.

Download or read book Active Control of Vibration written by Christopher C. Fuller and published by Academic Press. This book was released on 1996-02-08 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a companion text to Active Control of Sound by P.A. Nelson and S.J. Elliott, also published by Academic Press. It summarizes the principles underlying active vibration control and its practical applications by combining material from vibrations, mechanics, signal processing, acoustics, and control theory. The emphasis of the book is on the active control of waves in structures, the active isolation of vibrations, the use of distributed strain actuators and sensors, and the active control of structurally radiated sound. The feedforward control of deterministic disturbances, the active control of structural waves and the active isolation of vibrations are covered in detail, as well as the more conventional work on modal feedback. The principles of the transducers used as actuateors and sensors for such control strategies are also given an in-depth description. The reader will find particularly interesting the two chapters on the active control of sound radiation from structures: active structural acoustic control. The reason for controlling high frequency vibration is often to prevent sound radiation, and the principles and practical application of such techniques are presented here for both plates and cylinders. The volume is written in textbook style and is aimed at students, practicing engineers, and researchers. Combines material from vibrations, signal processing, mechanics, and controls Summarizes new research in the field

Download or read book Acoustic Replication in Smart Structure Using Active Structural acoustic Control written by Steven F. Griffin and published by . This book was released on 1996 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Optimization of Force Inputs for Active Structural Acoustic Control Using a Neural Network written by and published by . This book was released on 1992 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Active Structural Acoustic Control and Smart Structures written by and published by . This book was released on 1991 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: This final technical report for the DARPA/ONR Advanced Submarine Technology (AST) Program concerns recent VPI & SU research in the area of active structural acoustic control with active/adaptive structures. The material is divided into progress in the areas of structural acoustics, actuators, sensors, and control approaches. Due to the coupled nature of the problem, considerable effort throughout the VPI & SU program has been given to the interaction of these areas with each other, and their integration. The focus is analytical and experimental investigations of active control of sound radiation from simple panels as well as panels with some added complexity using point and distributed control forces and sensors on the plates. The results presented show that significant progress has been made towards controlling structurally radiated noise by active/adaptive means applied directly to the structure. The demonstrated technology is highly applicable to acoustic quieting in advanced submarine designs.

Download or read book Active Noise Control written by Giora Rosenhouse and published by Witpress. This book was released on 2001 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will give a physical insight into the modern field of active sound and vibration control. It will present the latest technology and achievements. The approach is generally design orientated and has a viewpoint different to other publications.

Download or read book Active Control Of Aircraft Cabin Noise written by Ignazio Dimino and published by World Scientific. This book was released on 2015-07-13 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'The text is well written and supported by clear and useful illustrations. This would be a useful textbook for postgraduate or advanced undergraduate studies and would also make a good introductory text for engineers moving into the field. The literature survey and bibliography provide a useful starting point for further study.'The Aeronautical JournalActive Control of Aircraft Cabin Noise provides a bridge to fill the gap between robust control theory and practical applications of active noise control systems in aircraft cabin. Both the possibilities and limitations of structural solutions to enhance aircraft cabin comfort by reducing interior noise are discussed supported by a wide range of topics in engineering, from finite element modeling to multichannel adaptive feed-forward control, usually dealt separately in the literature. In addition, experimental noise attenuation results with passengers' subjective perceptions predicting the effects of cabin noise on comfort assessments is examined. Theoretical and experimental research is detailed enough to capture the interest of the non-expert in engineering who wishes to have an overview of some of the active noise control applications in aircraft. This book may be used as an advanced textbook by graduate and undergraduate students in aeronautical engineering, and would be an authoritative resource book for research into the subject.

Download or read book Development of a Pseudo uniform Structural Velocity Metric for Use in Active Structural Acoustic Control written by Jeffery M. Fisher and published by . This book was released on 2010 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Active control of sound and vibration fields has become an strong area of research over the past few decades. In regards to the active control of acoustic radiation from vibration fields, known as active structural acoustic control (ASAC), there have been many different methods employed to understand structural and acoustic relationships and to control vibrations to limit the acoustic radiation. With active sound field control, sensors, usually microphones, need to be dispersed in the sound field, or an array of microphones must be placed directly in the sound field which, in many cases, uses up too much space for practical applications. To remedy this, objective functions have been transferred to the structure, sensing vibrations rather than pressures. A small, integrated array of structural sensors can be placed on the structure, reducing the system's overall footprint.

Download or read book Active Structural Acoustic Control of Noise Transmission Through Double Panel Systems written by James P. Carneal and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Active Control of Noise and Vibration written by Colin Hansen and published by CRC Press. This book was released on 1996-11-21 with total page 1292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This major work is the first to treat the active control of both sound and vibration in a unified way. It outlines the fundamental concepts, explains how a reliable and stable system can be designed and implemented, and details the pitfalls . It covers sound in ducts, sound radiation, sound transmission into enclosures, structural vibration and isolation, electronic control system design, and sensors and actuators.

Download or read book Active Vibration Control and Structural Acoustic Control for Simple and Complex Structures written by Serkan Külah and published by . This book was released on 2012 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Active structural acoustic control of sound transmission through a plate written by Thomas Christopher Sors and published by . This book was released on 2000 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: