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Analytical and experimental studies of beam waveguide absorbers for structural damping

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Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Mechanical engineering

  • About the Edition

    The reduction of structural vibrations in ships and submarines is a long standing concern of the Navy. Waveguide absorbers are very effective devices which can be applied to this problem. This study evaluates the increase in vibration damping of a plate structure across a broad frequency range using light weight beam waveguide absorbers. Viscoelastic and constrained layer beam waveguide absorbers were studied both theoretically and experimentally. Impedances of the waveguide absorbers at the attachment point were predicted using both Bernoulli-Euler and Timoshenko beam theory for the viscoelastic beam and using sixth order beam theory for the constrained layer beam. The theoretically predicted impedances were compared with the experimental measurements. Results from random vibration tests of a plate structure showed significant increases in damping over a broad frequency range (100 Hz - 2 KHz) when the waveguide absorbers were attached on the plate. Keywords: Waveguide absorber, Viscoelastic, Constrained layer, Beam.

    Edition Notes

    StatementGi Gon Lee
    ContributionsNaval Postgraduate School (U.S.)
    The Physical Object
    Paginationx, 112 p. ;
    Number of Pages112
    ID Numbers
    Open LibraryOL25520846M

    In actual accelerator application, many RF cavities need to be over-coupled with β > 1 for reasons of beam loading compensation, reduction of cavity filling time, etc. This paper discusses a modified analytical formulation by including the effect of loop inductance in the determination of loop size for any desired coupling coefficient. Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium aracdegerkaybi.online word comes from Latin vibrationem ("shaking, brandishing"). The oscillations may be periodic, such as the motion of a pendulum—or random, such as the movement of a tire on a gravel road.. Vibration can be desirable: for example, the motion of a tuning fork, the reed in a woodwind instrument or. Topics in Modal Analysis & Testing, Volume 8: Proceedings of the 37th IMAC, A Conference and Exposition on Structural Dynamics, , the eighth volume of eight from the Conference brings together contributions to this important area of research and engineering. ON THE DAMPING ANALYSIS OF LAYERED BEAM STRUCTURES A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Master of Technology (By Research) In Mechanical Engineering (Specialization: Machine Design and Analysis.


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Analytical and experimental studies of beam waveguide absorbers for structural damping by Gi Gon Lee Download PDF EPUB FB2

Structureacrossabroadfrequencyrangeusinglightweightbeamwaveguideabsorbers. Viscoelastic and constrained layer beam waveguideabsorberswere studied both theore- tically and experimentally. ANALYTICAL AND EXPERIMENTAL STUDIES OF BEAM WAVEGL'IDE ABSORBERS FOR STRUCTURAL DAMPING by Gi Gon Lee Lieutenant, Korean Navy B.S., Naval Academy of Korea, Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN MECHANICAL ENGINEERING from the NAVAL POSTGRADUATE SCHOOL March Author: Gi.

Waveguide absorbers are very effective devices which can be applied to this problem. This study evaluates the increase in vibration damping of a plate structure across a broad frequency range using light weight beam waveguide absorbers.

Viscoelastic and constrained layer beam waveguide absorbers were studied both theoretically and aracdegerkaybi.online: Gi Gon Lee. ANALYTICAL AND EXPERIMENTAL STUDIES OF BEAM WAVEGUIDE ABSORBERS FOR STRUCTURAL DAMPING. The reduction of structural vibrations in ships and submarines is a longstanding concern of the Navy.

Waveguide absorbers are very effective devices that can be used to deal with this problem. This study evaluates the increase in vibration damping of a plate structure across a broad frequency range, using lightweight beam waveguide aracdegerkaybi.online by: 1.

Then both analytical and experimental studies on the damping estimation are conducted and possibilities of improvement are explored. Various passive damping treatments using ViscoElastic Materials (VEMs) are designed, manufactured and then added to aluminum and composite beams and plates.

Experiments on these damped structures are conducted. Sep 01,  · Finally, the good vibration absorption of the beam absorber is verified. The results show that the feasibility and effectiveness of cantilever beam-type absorber is confirmed, and the dynamic vibration absorber with continuous adjustable parameters is aracdegerkaybi.online: Jun Zhao, Chao Yang Ma.

Sep 15,  · Similar sandwich damping treatments have also been used in some other experimental studies on ABH [38,39]. The added weight of the ABH-RBD is % that of the primary beam.

The added weight of the ABH-RBD is % that of the primary aracdegerkaybi.online Analytical and experimental studies of beam waveguide absorbers for structural damping book 6.

Transverse Vibration of a Beam Structure Attached With Dynamic Vibration Absorbers: Experimental Analysis. M.H. Zainulabidin, N. Jaini. Abstract -In this paper the transverse vibration of a fixed fixed end solutionbeam attached with dynamic vibration absorbers (DVA) has been analyzed experimentally.

Structural Vibration: Analysis and Damping benefits from my earlier book Structural Vibration Analysis: Modelling, Analysis and Damping of Vibrating Structures which was published in but is now out of print.

This enhanced successor is far more comprehensive with more analytical discussion. A preliminary study experimentally confirms the potential of ABH as an efficient strategy for vibration damping: a modal analysis shows that the ABH significantly increases the Modal Overlap Author: Vivien Denis.

Sep 14,  · Over 80 problems are included with answers and worked solutions to most. This book provides engineering students, designers and professional engineers with a detailed insight into the principles involved in the analysis and damping of structural vibration while presenting a sound theoretical basis for further aracdegerkaybi.online by: Damping analysis of a flexible cantilever beam containing an internal fluid channel: Experiment, modeling and analysis.

Passive structural damping treatments have been applied with the use of high-viscosity fillings (in practice) and have been the focus of numerous research studies and papers. In this research, currently-used methods are reviewed and gaps are identified first.

Then both analytical and experimental studies on the damping estimation are conducted and possibilities of improvement are explored. Various passive damping treatments using ViscoElastic Materials (VEMs) are designed, manufactured and then added to aluminum and composite beams and plates.

Experiments on these. conducted an experimental analysis of the damping fluid in the shock absorber and heat transfer studies.

The purpose of this expe riment is to test and modify the absorber with various working fluids. When the absorption device is running, the absorber is heated. Heat heats the damping. Jan 31,  · A Tuned Mass Damper (TMD) is a structural passive control device fixed on a structure and composed of a linear oscillator which natural frequency is tuned to that of the structure, or to the dominant resonance frequency.

In this paper, an experimental TMD with adjustable stiffness and eddy current damping is aracdegerkaybi.online: Stefania Lo Feudo, Anissa Allani, Gwendal Cumunel, Pierre Argoul, Franco Maceri, Domenico Bruno. In this paper, we examine ambient effects on damping properties of flexible cantilever beams, each conveying an internal high-viscosity fluid channel.

Experiments are conducted to investigate how the internal fluids provide damping to the system under varied temperatures, frequencies and base-acceleration aracdegerkaybi.online by: 6. Apr 01,  · An analytical model which quantifies the bending and shearing contributions of the stand-off layer has been developed for a passive stand-off layer damping treatment applied to a beam.

The equations of motion were derived and solved in order to simulate the frequency responses of several beams treated with passive stand-off layer aracdegerkaybi.online by: Studies on Damped Vibration Absorbers: An Approach towards Structural Vibrations Control [AJAY VERMA] on aracdegerkaybi.online *FREE* shipping on qualifying offers.

Vibration is occasionally desirable. But, more often, vibration is undesirable, wasting energy and creating unwanted sound-noise. Mar 16,  · A particle tuned mass damper (PTMD), which is a creative integration of a traditional tuned mass damper and an efficient particle damper in the vibration control area, is proposed.

This paper presents a comprehensive study that involves experimental, analytical, and computational aracdegerkaybi.online by: Apr 01,  · The paper presents an analysis of the damping of laminated beams with four different stacking sequences.

The experimental investigation was conducted using tensile cyclic tests for different laminates studied. The impulse technique was chosen to perform modal analysis of the ease of implementation and quickness of the aracdegerkaybi.online by: 1. Experimental Vibration Analysis of piezo-laminated beam Int.

Res. of Science & Engineering, ; Volume 2, No. May-June 97 Fig. 3: Mode shapes of beam at different frequency At Hz the maximum voltage is rerecorded with P.E material of V with amplitude of V at a peak voltage of mV and RMS value of. Jun 17,  · Acoustic black holes (ABHs) are geometric structural features that provide a potential lightweight damping solution for flexural vibrations.

In this article, a parametric study of an ABH on a beam has been carried out to assess how practical design constraints affect its behaviour, thus providing detailed insight into design aracdegerkaybi.online by: 1.

The frequency response functions (receptances) of the host structure with the attached electromechanical TMD are compared with those from the benchmark system which is designed using classical mechanical vibration theory. The analysis is performed by the analytical modal analysis method (AMAM) and verified by the dynamic stiffness aracdegerkaybi.online: Sajid Rafique.

followed by a detailed discussion of optimal tuning and damping parameters in Den Hartog’s book on mechanical vibrations (). The initial theory was applicable for Floor beam aracdegerkaybi.online Page Thursday, July 11, PM increasing the basic structural damping by 4%.

The concrete mass block is about. This paper presents experimental and numerical results about the effectiveness of a beam-type twin dynamic vibration absorber for a cantilevered flexible structure carrying an unbalanced rotor. An experimental laboratory prototype setup has been built and implemented in our laboratory and numerical investigations have been performed through finite element aracdegerkaybi.online by: 2.

BRIEF HISTORY OF THE STUDY OF VIBRATION 3 modeling of spring, mass and damping elements, their characteristics and the combination of several springs, masses or damping elements appearing in a system. There follows a pre-sentation of the concept of harmonic analysis, which can be used for the analysis of gen-eral periodic motions.

Jul 29,  · Acoustic black holes (ABHs) are effective, passive, lightweight vibration absorbers that have been developed and shown to effectively reduce the structural vibration and radiated sound of beam and plate structures.

ABHs employ a local thickness change that reduces the speed of bending waves and increases the transverse vibration amplitude. The vibrational energy can then be Cited by: 6. Experimental Studies of Circular Viscoelastic Waveguide Absorbers for Passive Structural Damping 12 PERSONAL AUTHOR(S) Watson, Stephen James 13a TYPE OF REPORT 13b TIME COVERED 14 DATE OF REPORT (Year, Month, Day) 15 PAGE COUNT Master' s Thesis FROM TO -December 1 7.

The paper presents results of research on hydraulic automotive shock absorbers. The considerations provided in the paper indicate certain flaws and simplifications resulting from the fact that damping characteristics are assumed as the function of input velocity only, which is the case of simulation studies.

An important aspect taken into account when determining parameters of damping Cited by: proposed ABH-RBD embraces the principles of both dynamic vibration absorbers and waveguide absorbers.

Its design and implementation do not need a tedious parameter tuning, thus showing robustness to accommodate structural variations in the primary structure. Using a beam as a benchmark, both numerical simulations and experiments.

Waveguide HOM damping studies at JLab R. Rimmer et. HOM10, Cornell. Outline • Motivation • Data analysis for mode successful • Coupling set by distance from beam center line to waveguide step * could go higher because of transient demands.

Characterization of Folded Beam Waveguide Absorbers for Damping of Flexural Vibrations of a Thick Plate M.S Laser-Modulated Phase-Stepping Digital Shearography for the Quantitative Analysis of Structural Vibration Ph.D.

Thesis by Experimental Study of the Mechanism of Sound Generation by Rotating Stall in Centrifugal. Jul 19,  · Damping of Structural Vibrations in Beams and Elliptical Plates Using the Acoustic Black Hole Effect,” Experimental Analysis of Vibration and Radiated Sound Power Reduction Using an Array of Acoustic Black Holes.

NCAD Vibration Control of Variable Thickness Plates With Embedded Acoustic Black Holes and Dynamic Vibration Absorbers Cited by: DR. STEPHEN A. HAMBRIC Applied Research Lab (ARL) S.A., McDevitt, T.E., and Burroughs, C.B., “Characterization of Folded Beam Waveguide Absorbers for Damping of Flexural Vibrations in a Thick Plate," Noise Control Engineering from Finite Element and Experimental Studies of Beams with Constrained Layer Damping,” ASME Journal.

Sep 01,  · Thesis advisor, Young S. Shin. This banner text can have aracdegerkaybi.online: Sep 05,  · Dynamic Anomalies in a Modular Bridge Expansion Joint This initial acoustic investigation was soon overtaken by observations of fatigue induced cracking in structural beams transverse to the direction of traffic.

These beams are, in the English-speaking world, universally referred to as center beams. Experimental Study of Resonant.

It comprises a collection of papers presented at the seventh International Specialty Conference STESSA (Santiago, Chile, January ), and includes the state-of-the-art in both theoretical and experimental research on the behaviour of steel structures in seismic areas.

The book is organized in the following sections. A Review on Experimental Investigation on Damping of Layered and Riveted Structure Beam phenomenon is required for the study of damping effects in the jointed structures.

When the external load is applied on A. Beam: A beam is a horizontal structural member that is capable of. According to Viana and Steffen () the analytical model of passive vibration damping using piezoelectric patches with resonant shunt circuits shows that the general behavior of shunted piezoelectric systems is similar to the classical dynamic vibration absorbers.

The study presents interesting analytical and experimental data concerning the Cited by: 2. Palacios, J.L. and Smith, E.C., “Dynamic Analysis and Experimental Testing of Thin- Walled Structures Driven by Shear Tube Actuators,” AIAA Paper No.Proceedings of the 46th AIAA/AHS/ASME/ASCE/ASC Structures, Structural Dynamics, and Materials Conference, Austin, TX, April.

In this paper vibration of fixed beam analyzed and measured at different damping condition and at various speed by strip chart recorder and electronic aracdegerkaybi.onlinency response curve are obtained from experimental result and analyze for reduction in aracdegerkaybi.online paper investigate the nature of beam vibration at various condition for plain.About.

The Penn State Department of Aerospace Engineering, established in and the only aerospace engineering department in Pennsylvania, is consistently recognized as one of the top aerospace engineering departments in the nation, and is also an international leader in aerospace education, research, and engagement.has been damping, mode shapes, resonant frequency, etc.

but material damping has not been paid much attention. Some important literatures are given below: LITERATURE REVIEW 1. H H Yoo and S H Shin [4] Vibration analysis of a rotating cantilever beam is an important and peculiar subject of study in mechanical engineering.