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4 edition of The effect of damping on the localization of vibrations in large space structures found in the catalog.

The effect of damping on the localization of vibrations in large space structures

Ross Craig Bowser

The effect of damping on the localization of vibrations in large space structures

by Ross Craig Bowser

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  • 28 Currently reading

Published by National Library of Canada = Bibliothèque nationale du Canada in Ottawa .
Written in English


Edition Notes

SeriesCanadian theses = Thèses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches : negative.
ID Numbers
Open LibraryOL14726095M
ISBN 100315744065
OCLC/WorldCa30072409

Bindemann, A. C., and Ferri, A. A., , “The Influence of Alternative Friction Models on the Passive Damping and Dynamic Response of a Flexible Structure,” Proceedings of the 36th Structures, Structural Dynamics, and Materials Conference, New Orleans, LA, April 10–12, pp. – //Friction-Damping-and-Isolation-Systems. Beams and panels with viscoelastic (VE) damping are widely used in state-of-the-art engineering structures, allowing to achieve improved safety, increased durability, and noise and vibration control, as well as reduced costs during the through-life manufacturing, operation, and maintenance of the structural systems (e.g., Lockett ; Soong and Dargush ; Zhang and Soong ; Lee (ASCE)EM

Malfunctions or critical fatigue problems often occur in mistuned periodic structural systems since their vibration responses may become much larger than those of perfectly tuned periodic systems. These are called vibration localization phenomena and it is of great importance to accurately predict the localization phenomena for safe and reliable designs of the periodic structural :// Topics in Dynamics of Civil Structures, Volume 4: Proceedings of the 31 st IMAC, A Conference and Exposition on Structural Dynamics, , the fourth volume of seven from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Structural Dynamics, including

@article{osti_, title = {Development of Design Criteria for Fluid Induced Structural Vibrations in Steam Generators and Heat Exchangers}, author = {Catton, Uvan and Dhir, Vijay K and Mitra, Deepanjan and Alquaddoomi, Omar and Adinolfi, Pierangelo}, abstractNote = {Flow-induced vibration in heat exchangers has been a major cause of concern in the nuclear industry for several The control of a distributed-parameter system can be effected by a transformation to a finite-dimensional discrete system in terms of modal coordinates. If only a limited number of modal coordinates is controlled, then a phenomenon that has come to be known as control and observation spillover occurs. Observation spillover has been demonstrated to cause instability in undamped ://


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The effect of damping on the localization of vibrations in large space structures by Ross Craig Bowser Download PDF EPUB FB2

Fig. 3 shows the A r m s ∗ versus c ∗ plot, which is the result from many runs using C L Table 1 and other input parameters summarized in Table C.1 in Appendix input data were based on the 12 mm diameter cylinder used in the Shell tests. Typical properties are listed in Table cases used to create Fig.

3 included a parametric variation in uniform and linearly sheared flow   j. Smmd Vib. () 11 (1), THE ROLE OF DAMPING IN VIBRATION THEORY S. CRANDALL Department of MechaMcal Enghleerhtg, Massachusetts Institute of Technology, Cambridge, ~Iassachusetts, U.S.A.

(Reeeired 28 July ) In many applications of vibration and wave theory the magnitudes of the damping forces are small in comparison with the elastic and inertia ://   Close Drawer Menu Close Drawer Menu Menu.

Home; Journals. AIAA Journal; Journal of Aerospace Information Systems; Journal of Air Transportation; Journal of Aircraft; Journal of Guidance, Control, and Dynamics   The effect of on-site damping on breather arrest, localization, and non-reciprocity in strongly nonlinear lattices is analytically and numerically studied.

Breathers are localized oscillatory wavepackets formed by nonlinearity and :// The damping ratios of these structures are determined using free vibration test method. The results obtained show that the threaded joints model experiences higher damping than the welded model.

View Ignoring the effect of centrifugal force and Coriolis force can increase the vibration localization degree of bladed disk system. In order to address the problem of vibration localization of the mistuned bladed disk of an aeroengine, the finite element reduced order models of bladed disk was established by the component mode synthesis :// Course materials will be presented by two instructors: Dr.

Oleg Vinogradov,is a recognized expert in the field of mechanical has extensive industrial and academic experience in the subject area, including teaching undergraduate and graduate courses, research and consulting in the fields of machine design, mechanical vibrations, oilsands technology, granular mechanics Bit bounce and stick-slip vibration are detrimental to the service life of drillstring and down-hole equipment.

A two degrees-of-freedom lumped parameters model is employed to account for bit-rock interaction and coupled vibration. Qualitative analysis to system parameters is performed through analyzing the influence of the angular speed of the rotary table and the length of drillstring on It is known that, when the mechanical coupling between the substructures is weak, small imperfections in a periodic structure can induce vibration localization.

This phenomenon could lead to large vibration in certain regions of the structure and could be very harmful to the :// Alberto Lago, Antony Wood, in Damping Technologies for Tall Buildings, Analysis modeling and software.

When the structural vibration modes are uncoupled and the global damping is lower than 30%, equivalent linear analysis can be used for design. Alternatively, more refined types of analyses should be adopted, such as nonlinear time history or complex modal :// Certain large space structures with high modal densities fall in this category, and it is therefore important to include the effect of structural imperfections and disorder when designing control The phenomenon of vibration mode localization in periodic and near periodic structures has been well documented over the past four decades.

In spite of its long history, and presence in a wide Proc. SPIESmart Structures and Materials Damping and Isolation, pg (2 July ); doi: / Read Abstract + In a self-sensing actuator, a single piece of piezoelectric element is used simultaneously as a sensor and an :// In order to reveal the effect of the vehicle-track vertical coupling vibrations on the frame-mounted traction motor dynamics, a vehicle-track vertical coupling dynamic model with considering the influence of the frame-mounted traction motor is established, and the correctness of the model is verified by real vehicle test.

In case of the investigated vehicle model, the influences of the vehicle Examples considered include periodic or nearly periodic multi-span beams and multi-bay trusses, large space structures, space antennas, and almost periodic (a.p.) structures with circular symmetry   In recent years, construction of tall buildings has been of great interest.

Use of lightweight materials in such structures reduces stiffness and damping, making the building more influenced by wind loads. Moreover, tall buildings of more than 30 to 40 stories, depending on the geographical location, the wind effects are more influential than ://   Hence, once δ is known, the total damping ratio ζ can be calculated by the following equation (24) ζ = δ (2 π) 2 + δ 2.

The total damping is generally divided into three main categories: hydrodynamic damping, mechanical damping and viscous damping (Blake and Maga, ).

For this analysis, the sum of the last two components can be   An investigation of mode localization in mistuned tube-array structures is studied in this work. The continuous action of hot-cold fluid shock waves in tube-array heat exchangers results in a significant abrasive wear of the tubes, which in turn alters their dynamic behavior and may introduce an undesirable modal localization effect within the tube :// Also, the interactive effect of the damping and disorders on the wave localization in the DPV is investigated.

Moreover, by the wave transfer matrix method, the wave conversion phenomenon in the   The intrinsic resonance angular frequency (ω 0) of this system is (k/) Q is the quality factor of the resonator. From equation, stronger damping increased the energy transfer between the.

The effect of localization of the DP source has also been verified by artificially distributing the DP sources according to Eq. 12, but only on a given region around x 2. In the low passive Q model, the negative phase region progressively shrinks as the source is artificially ://The article presents equivalent mathematical models of a boring bar designed for deep boring, in a distributed and a discrete idealizations.

A mathematical model describing coupled torsional and lateral vibrations of a boring bar is constructed in the form of a set of differential equations with lagging of the cutting process dynamics.

A methodology for studying stability in small of the deep   structures, namely blade assemblies [,], multi-span structures [], and some large space structures [15]. The manner in which the substructures, or bays, which make up a (nearly) periodic structure are interconnected plays a major role in its dynamics and in the occurrence of mode localization