Author: David Studley NokesPublisher:
ISBN:
Category : Damping (Mechanics)
Languages : en
Pages : 292
Book Description
Constrained Layer Damping of Beams with Partial Coverage
Author: David Studley NokesPublisher:
ISBN:
Category : Damping (Mechanics)
Languages : en
Pages : 292
Book Description
Analysis and Optimization of Partial Length, Constrained Damping Layers
Author: Shing-Jia TangPublisher:
ISBN:
Category :
Languages : en
Pages : 110
Book Description
A laminated beam with constrained damping layers is analyzed. The normal strain in the longitudinal direction and shear strain in the viscoelastic layer is considered. Hamilton's principle is used to derive equations of motion and boundary conditions. A 6th order equation is used to describe the portion of the beam covered with a constrained damping layer and a 4th order equation is used to describe the remainder of the beam. The characteristic equations are solved numerically with a gradient-based optimization method in order to determine normalized loss factor values. The loss parameter (normalized loss factor) is shown to be a function of the shear parameter (g[subscript N]), the geometric parameter (Y[subscript N]), the normalized coverage length (x/L), coefficients B1, B2, B3 and the core loss factor ([eta]2). It is shown that, in many cases, a beam with partial coverage has more damping effect than fully covered beam. Optimal shear parameter and coverage length values are determined for a variety of configurations. Results demonstrate the optimal values for the shear parameter and coverage length in order to obtain the highest damping levels. Plots are derived in order to determine the optimal coverage length for any shear parameter value for maximum loss factor.
The Shock and Vibration Bulletin
Author: Discrete Structural Optimization
Author: Witold GutkowskiPublisher: Springer Science & Business Media
ISBN: 3642850952
Category : Technology & Engineering
Languages : en
Pages : 263
Book Description
The IUTAM Symposium on "Discrete Structural Optimization" was devoted to discuss optimization problems for which design va riables may not be sought among continuous sets. Optimum sizing from lists of available profiles, segmentation; as well as allocation and number of supports, sensors or actuators, are good exam ples of such problems for which design variables may be chosen only from finite sets. The above problems are having not only important practical applications. They are also inspiring scienti fic research in the field of discrete applied mathematics. Among them are controlled enumeration methods, subgradient approach, genetic programming, multicriteria optimization, neural nets etc. Along with its tradition of promoting and supporting new im portant fields of research in mechanics and its application, General Assembly of IUTAM decided in 1990 to support the Sumposium. It is worthy to note that this is the second IUTAM Symposium on structural optimization, organized in Poland. The first one was held in Warsaw twenty years ago and was organized by Profe ssors Sawczuk and Mroz. It was devoted mostly to problems with continuous design variables. The Symposium which gathered 40 participants from 12 coun tries was sponsored by several institutions listed below. However support by IUTAM should be specially appreciated. It helped se veral scientists to contribute to the Symposium which other way wouldn't attend the meeting.
Polymers for Vibration Damping Applications
Author: Bikash C. ChakrabortyPublisher: Elsevier
ISBN: 0128192534
Category : Technology & Engineering
Languages : en
Pages : 350
Book Description
Polymers for Vibration Damping Applications is a detailed guide on the use of polymers and polymer composites for vibration and shock damping. The book begins with two chapters that introduce the fundamentals of both vibration and shock damping. The next part of the book presents in-depth coverage of polymeric materials for vibration damping, including viscoelastic properties, design of polymer systems, and modes and applications. Finally, measurement techniques are discussed in detail. Throughout the book, the different perspectives of materials and engineering are considered, and both mathematical and conceptual approaches are used. This is an essential resource for all those looking to understand the application of polymers for vibration damping, including researchers, scientists and advanced students in polymer science, plastics engineering, materials science and mechanical engineering, as well as engineers and R&D personnel in the automotive, marine, defense and construction industries. Equips the reader with a complete, fundamental understanding of vibration and shock damping Explains the viscoelastic properties, design and applications of polymeric materials for vibration damping applications Includes cutting-edge research on the use of polymers for advanced civil and defense applications
Tuned Constrained Layer Damping of Head & Lens Suspension Modes Excited by Disk Vibration and Air Flow in DASD
Author: Joshua Charles HarrisonPublisher:
ISBN:
Category : Computer storage devices
Languages : en
Pages : 404
Book Description
The Shock and Vibration Digest
Author: The Shock and Vibration Bulletin
Author: Smart Polymers
Author: Asit Baran SamuiPublisher: CRC Press
ISBN: 1000556026
Category : Technology & Engineering
Languages : en
Pages : 323
Book Description
Smart materials have been produced by conceiving of the idea of materials/systems having a fourth dimension. To match advances in instrumentation, efforts are being made to develop materials, resulting in smart materials with enhanced performance. In nature, the action of stimuli-responsive materials is reversible; this idea has attracted interest for its potential research and industrial applications. The challenge remains how to couple these applications with environmental consciousness. This book presents the basics of smart polymers and describes their current and future applications. This book is different from other books on the subject in that it explores polymer materials’ smart behavior in more depth, covering vibration damping, thermal and electrochemical energy, sensing at trace level, biotechnology, and so on. The 14 chapters in this book cover diverse areas, including: • Photoresponsive polymers that can be manipulated using a specific frequency of light • Designing polymers for vibration damping • Smart manipulations of hydrophobic and super-hydrophobic polymers • Biopolymers, including hydrogels for smart application, drug delivery, and other uses • Smart paints • Self-healing and shape memory polymers • Holography for data storage • Phase change polymers and solid polymer electrolytes for thermal and electrochemical energy • Molecular imprinting polymers for sub-ppm sensing and removal of unwanted materials • Smart textiles, and the concept of advanced textiles This book will be of particular interest to researchers, postgraduates, and industry experts. It offers an extensive introduction to the basics of smart polymers and their possible applications.
Environmental Enginering Abstracts
Author: Sanida Laboratories. Simulated Environments Information CenterPublisher:
ISBN:
Category : Buildings
Languages : en
Pages : 46
Book Description