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 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 Designing Quiet Structures written by Gary H. Koopmann and published by Elsevier. This book was released on 1997-10-13 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first of its kind. It provides the reader with a logical and highly quantitative means of including noise as a parameter in the early design stages of a machine or structure. The unique and unified methodology builds upon the familiar disciplines of acoustics, structural dynamics and optimization. It also exemplifies the art of simplification - the essence of all good engineering design. Strategies for designing quiet structures require extensive analytical and experimental tools. For computing the sound power from complex structures the authors recommend a new 3-D, lumped parameter formulation. This fully developed, user-friendly program can be applied generally to noise-control-by-design problems. Detailed instructions for running the application are given in the appendix as well as several sample problems to help the user get started. The authors also describe a new instrument: a specially developed resistance probe used to measure a structure=92s acoustic surface resistance. As an example, the procedure is outlined for measuring the valve cover of an internal combustion engine. Indeed, throughout the book the reader is presented with actual experiments, numerical and physical that they can replicate in their own laboratory. This is a must-have book for engineers working in industries that include noise control in the design of a product. Its practical and didactic approach also makes it ideally suited to graduate students. First text covering the design of quiet structures Written by two of the leading experts in the world in the area of noise control Strong in its integration of structural dynamics, acoustics, and optimization theory Accompanied by a computer program that allows the computation of sound power Presents numerous applications of noise-control-by-design methods as well as methods for enclosed and open spaces Each chapter is supported by homework problems and demonstration experiments

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 Active Structural Acoustic Control of Road Noise in a Passenger Vehicle written by Amanjot S. Dhaliwal and published by . This book was released on 2004 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Active and Adaptive Control of Noise Transmission in Structures written by Khairul Affendy Md Nor and published by . This book was released on 2018 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis presents a method of calculating the radiated sound power of vibrating structures based on the time domain estimation of acoustic radiation modes (ARMs). Each ARM is frequency-dependent, radiates power independent of the other ARMs and can be estimated in the time domain from measurements made at discrete sensor locations on the surface of the radiating structure. The individual ARM components are estimated digitally in the time domain using finite impulse response filters, which are designed to provide a best weighted fit to the ARMs in the frequency domain. The ARM amplitudes are estimated by filtering the vectors of measured velocities at points on the radiating surface with these ARM filters, before summing the product of the square of these amplitudes multiplied by the relevant ARM eigenvalues to estimate the radiated sound power. The method is described with reference to one and two dimensional radiators, namely a simply supported beam and a clamped plate. The results show that the sound power calculated from the proposed approach and from a frequency domain approach are comparable. Next, real time simulations of active structural acoustic control are performed using real-time ARM amplitudes as the cost function of the controller. The primary path is the path between the disturbance signal and the error signal, in this case, the ARM amplitude. The secondary path is from the controller output to the error signal. Two control strategies are considered here. The first one is nonadaptive feedforward active structural acoustic control, which is applied to a baffled beam. The controller transfer function is defined by the ratio of the primary path and secondary path frequency responses. This technique requires the control path to be accurately estimated using an FIR filter to get good attenuation. The second strategy is adaptive feedforward active structural acoustic control with reference to the baffled plate as the radiator. The controller is based on the filtered-x version of the adaptive LMS algorithm. Here two FIR filters are required to estimate the secondary and the control paths. To get good attenuation, the optimal locations of the control actuators are obtained using a swarm intelligent algorithm called Ant Colony Optimization. Finally, physical experiments are conducted to validate the findings.

Download or read book IUTAM Symposium on Designing for Quietness written by MANOHAR LAL Munjal and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is well known that noise control at the source is the most cost-effective. Designing for quietness is therefore the most important concept in Engineering Acoustics or Technical Acoustics. The IUTAM Symposium on Designing for Quietness held at the Indian Institute of Science Bangalore in December 2000, was probably the first on this topic anywhere in the world. Papers were invited from reputed researchers and professionals spread over several countries. 18 of the 21 papers presented in the Symposium are included in these proceedings after rigorous review, revision and editing. This volume covers a large number of applications, such as silencers, lined ducts, acoustic materials, source characterization, acoustical design of vehicle cabs, ships, space antennas, MEMS pressure transducer etc., active control of structure-borne noise and cavities, SEA for engine noise and structural acoustic modelling with application to design of quieter panels. A list of references at the end of every paper will provide sources for further reading.

Download or read book The Reduction of Structure borne Noise by Active Control of Vibration written by Wouter Dehandschutter and published by . This book was released on 1997 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Understanding Active Noise Cancellation written by Colin H. Hansen and published by CRC Press. This book was released on 1999-06-04 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding Active Noise Cancellation Provides a concise introduction to the fundamentals and applications of active control of vibration and sound for the non-expert. It is also a useful quick reference for the specialist engineer. The book emphasises the practical applications of technology, and complex control algorithms and structures are onl

Download or read book Active Noise Control Primer written by Scott D. Snyder and published by Springer Science & Business Media. This book was released on 2012-09-25 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: By providing all the basic knowledge needed to assess how useful active noise control will be for a given problem, this book assists in the designing, setting up, and tuning of an active noise-control system. Written for students who have no prior knowledge of acoustics, signal processing, or noise control but who do have a reasonable grasp of basic physics and mathematics, the text is short and descriptive, leaving all mathematical details and proofs concerning vibrations, signal processing and the like to more advanced texts or research monographs. The book can thus be used in independent study, in a classroom with laboratories, or in conjunction with a kit for experiment or demonstration. Topics covered include basic acoustics, human perception and sound, sound intensity and related concepts, fundamentals of passive noise- control strategies, basics of digital systems and adaptive controllers, and active noise control systems.

Download or read book Noise Control written by Colin H. Hansen and published by CRC Press. This book was released on 2018-09-03 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise Control: From Concept to Application presents the basic principles of noise control and their practical application to real problems. Numerous examples are worked out in detail and are used to illustrate the concepts in the book. There are few derivations of equations, but reference is made to texts from which these are derived. An excellent learning tool for students and practitioners, this guide to noise control will enable readers to use their knowledge to solve a wide range of industrial noise control problems. Working from basic scientific principles, the author shows how an understanding of sound can be applied to real-world settings.

Download or read book Structural Acoustic Prediction and Interior Noise Control Technology written by and published by DIANE Publishing. This book was released on 2001 with total page 70 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 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 Noise Control written by and published by . This book was released on 1982 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On the Use of Modern Control Theory for Active Structural Acoustic Control written by William R. Saunders and published by . This book was released on 1991 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: