Download or read book Passive Vibration Control of Thick Aluminum Plates Using Viscoelastic Layered Damping written by Hsin-Chih Ping and published by . This book was released on 1990 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ship silencing is an important issue of modern naval warfare. For a long time, naval ship engineers have tried to reduce the noise from the vibration of shipboard components. Ths is important for a ship to accomplish its mission with good survivability. One method, called constrained viscoelastic layer method, uses shear deformation in viscoelastic material to absorb and dissipate the vibrational energy of the system. It shows promise in damping over a broad frequency spectrum of vibration. A finite element technique developed by Johnson and Kienholz Ref. 1 known as the Modal Strain Energy (MSE) method which uses the ratio of strain energy for each mode shape to approximate the modal damping of a structure for a given constrained viscoelastic damping system. The method is very attractive due to its simple concept and very useful because it can be applied to any general cases with arbitrary shape by using the finite element method.
Download or read book Constrained Viscoelastic Layer Damping of Thick Aluminum Plates written by Michael John Bateman and published by . This book was released on 1990 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern naval warfare has been increasingly dependent upon the acoustic silencing of the participants. Constrained viscoelastic layer damping of vibrating elements is one method which can be used to meet acoustic silencing goals. This paper considers constrained viscoelastic layer damping treatments applied to a thick aluminum plate, including single layer, double layer, a milled pocket plate, and a milled 'floating element' configuration. High modal damping values were obtained for each damping configuration. The Modal Strain Energy method, using finite element analysis to estimate modal loss factors, was investigated for use as a tool in constrained viscoelastic layer damping design. A comparison of experimentally measured frequency response and modal loss factors with those predicted by the modal stain energy method is presented to confirm the possible use of the modal strain energy method as a design tool. Keywords: Vibration, Damping, Viscoelastic material, Constrained layer damping. (JS).
Download or read book Passive Vibration Control Using Viscoelastic and Constrained Layer Beam Waveguide Absorbers written by Charles T Horne (III.) and published by . This book was released on 1988 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reduction of noise and vibrations within structural systems has been a long standing problem. Recent studies have indicated that waveguide absorbers have been effective in the reduction of noise and vibrations over a broad frequency range. A waveguide absorber is a structure along which vibrational waves can travel. If the waveguide absorber is treated with an energy dissipation scheme, the amplitudes of the waves will decrease as they travel along the waveguide absorber. the test structure consisted of a rectangular aluminum plate with clamped boundary conditions. A finite element analysis approach theoretically predicted the test structure's mode shapes and modal strain energies. An experimental modal survey was conducted to compare with the theoretically predicted mode shapes and natural frequencies. The mode shapes and modal strain energies determined the optimum locations of the waveguide absorbers and their orientation on the test structure. The frequency range of interest and mode shapes determined the required number of waveguide absorbers. Experiments were conducted using viscoelastic and constrained layer beam waveguide absorbers over a 2000 Hertz frequency range. Significant reduction of the test structure's frequency response was demonstrated through the effective use of multiple beam waveguide absorbers. Theses. (aw).
Download or read book Active and Passive Vibration Damping written by Amr M. Baz and published by John Wiley & Sons. This book was released on 2019-04-08 with total page 751 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide to the application of viscoelastic damping materials to control vibration and noise of structures, machinery, and vehicles Active and Passive Vibration Damping is a practical guide to the application of passive as well as actively treated viscoelastic damping materials to control vibration and noise of structures, machinery and vehicles. The author — a noted expert on the topic — presents the basic principles and reviews the potential applications of passive and active vibration damping technologies. The text presents a combination of the associated physical fundamentals, governing theories and the optimal design strategies of various configurations of vibration damping treatments. The text presents the basics of various damping effective treatments such as constrained layers, shunted piezoelectric treatments, electromagnetic and shape memory fibers. Classical and new models are included as well as aspects of viscoelastic materials models that are analyzed from the experimental characterization of the material coefficients as well as their modeling. The use of smart materials to augment the vibration damping of passive treatments is pursued in depth throughout the book. This vital guide: Contains numerical examples that reinforce the understanding of the theories presented Offers an authoritative text from an internationally recognized authority and pioneer on the subject Presents, in one volume, comprehensive coverage of the topic that is not available elsewhere Presents a mix of the associated physical fundamentals, governing theories and optimal design strategies of various configurations of vibration damping treatments Written for researchers in vibration damping and research, engineers in structural dynamics and practicing engineers, Active and Passive Vibration Damping offers a hands-on resource for applying passive as well as actively treated viscoelastic damping materials to control vibration and noise of structures, machinery and vehicles.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Smart Structures Theory written by Inderjit Chopra and published by Cambridge University Press. This book was released on 2014 with total page 925 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on smart materials and structures, which are also referred to as intelligent, adaptive, active, sensory, and metamorphic. The ultimate goal is to develop biologically inspired multifunctional materials with the capability to adapt their structural characteristics, monitor their health condition, perform self-diagnosis and self-repair, morph their shape, and undergo significant controlled motion.
Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1992 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vibration Damping of Aluminum Plates Using Acoustic Black Holes for Application in Aerospace Structures written by Angelina Conti and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, scientists have investigated the acoustic black hole (ABH) effect as a low-weight high-performance vibration control device for application in aerospace structures. The ABH effect uses a specific power-law skin thickness taper to decrease the velocity of an incident bending wave to nearly zero. Once the velocity has decreased, the wave is unable to reflect back at the far edge, thus trapping it in the ABH. Applying a small amount of viscoelastic damping material to the surface of the ABH dissipates most of the vibration while adding very little weight and cost to the overall structure. Experimental tests prove that the ABH is an effective way to trap and damp vibration energy. The ABH effect is quantified through experimental broadband vibration response comparisons between three aluminum plates of varying degree of vibration control and damping. In general, the low-frequency responses were very similar among all three plates since global modes dominate the response. After the cut-on frequency of the ABH was reached, the ABH effect induced a large variation in the surface averaged mobility, explained by the focusing of energy in the ABH cells. The application of damping material decreased the surface averaged mobility and its variation. Increasing the frequency also decreased the surface averaged mobility variation. These experiments proved that the ABH effect successfully focuses vibration energy from the plate to the center of the two-dimensional ABH and that the added layer of damping material effectively reduces the vibration energy of the structure, while adding very little weight. The ABH could potentially replace traditional heavy and inefficient acoustic treatments, increasing the fuel efficiency by decreasing the weight devoted to acoustic treatment. Future work will include testing an "add-on" ABH device for application in existing airframes.
Download or read book Active and Passive Vibration Damping written by Amr Mahmoud Sabry Baz and published by . This book was released on 2019 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide to the application of viscoelastic damping materials to control vibration and noise of structures, machinery, and vehicles Active and Passive Vibration Damping is a practical guide to the application of passive as well as actively treated viscoelastic damping materials to control vibration and noise of structures, machinery and vehicles. The author - a noted expert on the topic - presents the basic principles and reviews the potential applications of passive and active vibration damping technologies. The text presents a combination of the associated physical fundamentals, governing theories and the optimal design strategies of various configurations of vibration damping treatments. The text presents the basics of various damping effective treatments such as constrained layers, shunted piezoelectric treatments, electromagnetic and shape memory fibers. Classical and new models are included as well as aspects of viscoelastic materials models that are analyzed from the experimental characterization of the material coefficients as well as their modeling. The use of smart materials to augment the vibration damping of passive treatments is pursued in depth throughout the book. This vital guide: Contains numerical examples that reinforce the understanding of the theories presented Offers an authoritative text from an internationally recognized authority and pioneer on the subject Presents, in one volume, comprehensive coverage of the topic that is not available elsewhere Presents a mix of the associated physical fundamentals, governing theories and optimal design strategies of various configurations of vibration damping treatments Written for researchers in vibration damping and research, engineers in structural dynamics and practicing engineers, Active and Passive Vibration Damping offers a hands-on resource for applying passive as well as actively treated viscoelastic damping materials to control vibration and noise of structures, machinery and vehicles.
Download or read book Passive Vibration Control Using Viscoelastic and Constrained Layer Beam Waveguide Absorbers written by Charles T. Horne and published by . This book was released on 1988 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Viscoelastic Surface Treatments for Passive Control of Structural Vibration written by Fernando Cortés and published by Nova Novinka. This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the structural vibration reduction making use of passive damping control techniques by means of surface treatments with viscoelastic materials. In fact, this kind of vibration control technique is largely utilised nowadays for several industrial applications, such as aeronautical and automotive components. In this context, this work involves a double objective. On the one hand, a classical and contemporarily relevant survey on different subjects concerning viscoelastic treatments is provided. On the other hand, two examples of application are shown.
Download or read book Vibration Damping written by Ahid D. Nashif and published by John Wiley & Sons. This book was released on 1991-01-16 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: A practical approach to the application of viscoelastic damping materials to control vibration and noise problems in industrial structures, machinery, computer machinery, and vehicles. Assuming a basic understanding of mechanical engineering, the text covers implementation of theory, including material properties, dynamic structural response, design procedures and practical applications. Based on an understanding of both the properties of materials and the vibrational response of structures. Considers individual structures and the damping materials properties simultaneously. Includes extensive collection of data sheets for a large number of useful damping materials.
Download or read book Passive Vibration Control of Structures written by Suhasini Madhekar and published by CRC Press. This book was released on 2022-05-05 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research in vibration response control deals not only with prevention of catastrophic failures of structures during natural or accidental/manmade hazards but also ensures the comfort of occupants through serviceability. Therefore, the focus of this book is on the theory of dynamic response control of structures by using different kinds of passive vibration control devices. The strategies used for controlling displacement, velocity, and acceleration response of structures such as buildings, bridges, and liquid storage tanks under the action of dynamic loads emanating from earthquake, wind, wave, and so forth are detailed. The book: Explains fundamentals of vibration response control devices and their practical applications in response mitigation of structures exposed to earthquake, wind, and wave loading Offers a comprehensive overview of each passive damper, its functioning, and mathematical modeling in a dynamical system Covers practical aspects of employing the passive control devices to some of the benchmark problems that are developed from existing buildings and bridges in different countries worldwide Includes MATLAB® codes for determining the dynamic response of single degree of freedom (SDOF) and multi-degree of freedom (MDOF) systems along with computational models of the passive control devices This book is aimed at senior undergraduate students, graduate students, and researchers in civil, earthquake, aerospace, automotive, mechanical engineering, engineering dynamics, and vibration control, including structural engineers, architects, designers, manufacturers, and other professionals.
Download or read book Proceedings of the 15th International Ship and Offshore Structures Congress written by A.E Mansour and published by Elsevier. This book was released on 2003-06-26 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: KEY FEATURES: Provides researchers in Ocean engineering with a thorough review of the latest research in the field Lengthy reports by leading experts A valuable resource for all interested in ocean engineering DESCRIPTION: The International Ship and Offshore Congress (ISSC) is a forum for the exchange of information by experts undertaking and applying marine structural research. These three volumes contain the eight technical committee reports, six Specialist Committee and 2 Special Task Committee reports which were presented for the 15th International Ship and Offshore Structures Congress (ISSC 2004) in San Diego USA, between 11th and 15th August 2003. Volume III will be published in 2004 and is to contain the discussion of the reports, the chairmen's reply, the text of the invited Lecture and the congress report of ISSC 2003.
Download or read book The vibration of multi layer plates with viscoelastic damping written by Simon Ndi Tatani and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Smart Structures and Materials written by and published by . This book was released on 1994 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
