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Relevant bibliographies by topics / Passive damping, semi-passive damping / Dissertations / Theses

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Dissertations / Theses on the topic 'Passive damping, semi-passive damping'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Potter, Jack. "Passive and semi-active damping of base-excited structures." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618724.

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It has become commonplace for discrete passive or active elements to be added to Structures to mitigate against vibration. More recently, semi-active damping has been a focus of research. Semi- active systems are attractive due to their performance, low cost, power consumption and control stability. In this thesis we consider how passive and semi-active damping systems may he designed to mitigate against. vibration in base-excited structures. initially we consider the base isolation of a single degree-of-freedom system. The optimality of the common sky-hook switching controller is assessed and

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2

Besinger, Frank Helmut. "The performance of passive and semi-active suspension for heavy lorries." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239042.

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3

Cheng, Bo. "Passive rotational damping in flapping flight." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 89 p, 2009. http://proquest.umi.com/pqdweb?did=1889090361&sid=9&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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4

Antler, Natania. "Passive damping of a LIGO mirror." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/51612.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.<br>Includes bibliographical references (p. 75-76).<br>There may be largely untapped source of information about our cosmic surroundings in the form of gravitational radiation, predicted by Einstein's theory of General Relativity. If detected, gravitational waves (GWs) could become a valuable means to study astrophysical events. The Laser Interferometer Gravitational-Wave Observatory (LIGO) has built detectors to search for these GWs. In essence, these detectors are several kilometer long Michelson interferometers wit

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5

Zhou, Shaoyi. "Advances in passive and active damping techniques." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI066.

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Les systèmes mécaniques (e.g. structures flexibles) sont généralement peu amortis, et par conséquent des vibrations de fortes amplitudes peuvent apparaitre. Il apparait nécessaire de développer des stratégies de contrôle vibratoire pour atténuer ces vibrations mécaniques. Cette thèse a pour objectif de développer plusieurs techniques d'amortissement de vibration passives ou actives. La première partie porte sur l'utilisation d'un “inerter” pour améliorer les performances de contrôle vibratoire de deux dispositifs existants, l'amortisseur à masse accordée (TMD) et deux TMDs placés en série (SDT

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6

Aldrich, Jack Barron. "Design of passive piezoelectric damping for space structures." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/46432.

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7

Lam, Margaretha Johanna. "Hybrid Active/Passive Models with Frequency Dependent Damping." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30770.

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To add damping to structures, viscoelastic materials (VEM) are added to structures. In order to enhance the damping effect of the VEM, a constraining layer is attached, creating a passive constrained layer damping treatment (PCLD). When this constraining layer is an active element, the treatment is called active constrained layer damping (ACLD). Recently, the investigation of ACLD treatments has shown it to be an effective method of vibration suppression. In this work, two new hybrid configurations are introduced by separating the passive and active elements. In the first variation

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8

Ahmad, Naveed. "Passive Damping in Stiffened Structures Using Viscoelastic Polymers." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/79566.

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Noise and vibration suppression is an important aspect in the design process of structures and machines. Undesirable vibrations can cause fatigue in a structure and are, therefore, a risk to the safety of a structure. One of the most effective and widely used methods of mitigating these unwanted vibrations from a system is passive damping, by using a viscoelastic material. This dissertation will primarily focus on constrained layer passive damping treatments in structures and the investigation of associated complex modes. The key idea behind constrained damping treatment is to increase damping

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9

Chaudry, Atif H. "Passive stand-off Layer damping treatment theory and experiments /." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3875.

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Thesis (M.S.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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10

Gueler, Richard. "The virtues of passive damping for feedback controlled flexible structures." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/52941.

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11

Palomera-Arias, Rogelio 1972. "Passive electromagnetic damping device for motion control of building structures." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33174.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Architecture, 2005.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (leaves 112-115).<br>The research presented in this thesis develops a new device for the passive control of motion in building structures: an electromagnetic damper. The electromagnetic damper is a self-excited device that provides a reaction force to an applied motion. We chose a tubular permanent-magnet linear machine as t

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12

De, Marneffe Bruno. "Active and passive vibration isolation and damping via shunted transducers." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210613.

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<p align="justify">Many different active control techniques can be used to control the vibrations of a mechanical structure: they however require at least a sensitive signal amplifier (for the sensor), a power amplifier (for the actuator) and an analog or digital filter (for the controller). The use of all these electronic devices may be impractical in many applications and has motivated the use of the so-called shunt circuits, in which an electrical circuit is directly connected to a transducer embedded in the structure. The transducer acts as an energy converter: it transforms mechanical (vi

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13

KONDEPUDI, RAMABALARAJENDRASESH. "NUMERICAL ANALYSIS OF LUMPED PARAMETER DYNAMIC SYSTEMS WITH FRICTION." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1083622496.

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14

Carter, Angela K. "Transient Motion Control of Passive and Semiactive Damping for Vehicle Suspensions." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36947.

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This research will compare the transient response characteristics of a four-degree-of-freedom, roll-plane model, representing a class 8 truck, using passive and semiactive dampers. The semiactive damper control policies that are examined include the previously developed policies of on-off skyhook, continuous skyhook, and on-off groundhook control, along with a newly developed method of fuzzy logic semiactive control. The model input will include body forces and torques, as well as transient displacements at the tires. The model outputs include the veh

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15

Alberts, Thomas Edward. "Augmenting the control of a flexible manipulator with passive mechanical damping." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/19442.

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16

Watson, Stephen James. "Experimental studies of circular viscoelastic waveguide absorbers for passive structural damping." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/25931.

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17

Rongong, Jem Athing. "Shear and extensional behaviour of passive and active constrained layer damping." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269380.

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18

Ping, Hsin-Chih. "Passive vibration control of thick aluminum plates using viscoelastic layered damping." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA243990.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 1990.<br>Thesis Advisor(s): Shin, Y.S. ; Kim, K.S. "December 1990." Description based on title screen as viewed on March 30, 2010. DTIC Identifier(s): Acoustics, damping, ship silencing, MSE (modal strain energy), constrained viscoeleastic layer method, aluminum plates, milled pocket plate, floating element plate. Author(s) subject terms: Vibration, damping, viscoelastic material, constrained layer damping. Includes bibliographical references (p. 149). Also available in print.

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19

Yan, Feng. "The use of passive damping to increase sound insulation in buildings." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/31643/.

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This thesis examined the potential sound insulation benefit by using damping material to absorb vibrational energy along its transmission path. Statistical Energy Analysis (SEA) was used to evaluate the effect on system performance of adding damping globally, as well as its influence on individual transmission paths. Nine different theoretical models were studied using both bending only and three-wave SEA models to predict the system behaviour in different frequency regions. The results suggest that global damping treatment generally increases the sound insulation in buildings. Initial increas

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20

Li, Kaixiang. "Structural vibration damping with synchronized energy transfer between piezoelectric patches." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00735788.

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Advanced materials such as carbon fiber, composite materials et al. are more and more used in modern industry. They make the structures lighter and stiffer. However, they bring vibration problems. Researchers studied numerous methods to eliminate the undesirable vibrations. These treatments are expected to be a compact, light, intellectual and modular system. Recently, a nonlinear technique which is known as Synchronized Switch Damping (SSD) technique was proposed. These techniques synchronously switched when structure got to its displacement extremes that leading to a nonlinear voltage on the

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21

Mokrani, Bilal. "Piezoelectric shunt damping of rotationally periodic structures." Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209112.

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New materials and new fabrication techniques in turbomachinery lead to monolithic<p>structures with extremely low damping which may be responsible for severe vibrations<p>and possible high-cycle fatigue problems. To solve this, various techniques<p>of damping enhancement are under investigation. The present work is focused on<p>piezoelectric shunt damping.<p>This thesis considers the RL shunt damping of rotationally periodic structures using<p>an array of piezoelectric patches, with an application to a bladed drum representative<p>of those used in turbomachinery. Due to the periodicity and the

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22

Yellin, Jessica M. "An analytical and experimental analysis for a one-dimensional passive stand-off layer damping treatment /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/7030.

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23

Verstappen, André Paul. "Passive damping treatments for controlling vibration in isotropic and orthotropic structural materials." Thesis, University of Canterbury. Mechanical Engineering, 2015. http://hdl.handle.net/10092/10197.

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The structural vibration damping behaviour of plates and beams can be improved by the application of viscoelastic passive damping materials. Unconstrained layer damping treatments applied to metal plate systems were studied experimentally. Design and modelling of novel fibre reinforced constrained layer damping materials was performed, and implementation of these composite damping materials into laminated composite sandwich constructions commonly used as structural elements within large composite marine vessels was explored. These studies established effective methods for examining, designing

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24

Koh, Byungjun. "Hybrid active-passive constrained layer damping treatments in beams, plates and shells." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/397336/.

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The basic concept of Hybrid Active-Passive Constrained Layer Damping (HAPCLD) treatment was proposed by introducing active control to the concept of passive constrained layer damping configuration in the 1990s to compensate for weak points in active and passive controls by using their respective merits for more robust and stable control. Since then, combinations of various configurations and applicable control strategies have been proposed and studied in many engineering areas. However, there is still a need for a new modelling method to more easily establish models of HAPCLD treatment and its

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25

Taulbee, Ron J. "Vibro-Acoustic Analysis of a Thin Cylindrical Shell with Minimal Passive Damping Patches." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1367459330.

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26

Gallimore, Craig Allen. "Passive Viscoelastic Constrained Layer Damping Application for a Small Aircraft Landing Gear System." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35350.

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The main purpose of this report was to test several common viscoelastic polymers and identify key attributes of their applicability to a small aircraft landing gear system for improved damping performance. The applied viscoelastic damping treatment to the gear was of a constrained layer type, promoting increased shear deformation over free surface treatments, and therefore enhanced energy dissipation within the viscoelastic layer. A total of eight materials were tested and analyzed using cyclic loading equipment to establish approximate storage modulus and loss factor data at varying loading

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27

Jeric, Kristina Marie. "An Experimental Evaluation of the Application of Smart Damping Materials for Reducing Structural Noise and Vibrations." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31833.

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This study evaluates the application of smart damping materials for reducing structural noise and vibrations. The primary purposes of this study are to: 1. Explore the feasibility of smart damping materials, such as piezoelectric materials, for augmenting and improving the noise and vibration benefits of passive damping materials, and 2. Provide a preliminary evaluation of the noise and vibration benefits, and weight savings of smart damping material as compared to conventional damping treatments. To achieve the objectives of the study, a special test rig, designed to measure both vib

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28

Kolluru, Kiran V. S. S. "On design and simulation of passive damping solutions for milling of thin-walled parts." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/14427/.

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Machining of thin wall structures is a challenging area due to the problems such as chatter and forced vibrations that arise due to low stiffness of such structures. Up to now, most of the research was driven by need to improve productivity in manufacturing of aircraft components such as airframe panels; hence, straight thin walls such as cantilever structures were considered for research in machining dynamics. However, thin wall casings and particularly thin wall assemblies that are encountered in jet engine casings are not well studied. Not only their dynamics is quite different from that of

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29

Park, Jae-Yeol. "Effect of Non-Proportional Damping and Spectrally-Varying Properties of Passive or Active Mounts on Powertrain Mounts." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1218466967.

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30

Daghini, Lorenzo. "Improving Machining System Performance through designed-in Damping : Modelling, Analysis and Design Solutions." Doctoral thesis, KTH, Maskin- och processteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93143.

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With advances in material technology, allowing, for instance, engines to withstand higher combustion pressure and consequently improving performance, comes challenges to productivity. These materials are, in fact, more difficult to machine with regards to tool wear and especially machine tool stability. Machining vibrations have historically been one of the major limitations to productivity and product quality and the cost of machining vibration for cylinder head manufacturing has been estimated at 0.35 euro per part. The literature review shows that most of the research on cutting stability h

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31

Vasudeva, Sumit. "Estimation of Elastic and Damping Characteristics of Viscoelastically Constrained Carbon Strands." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36467.

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<p> Traditional large space structure construction incorporates the use of lightweight tubular metal alloys that have good strength to weight and stiffness to weight ratio. Recently, however, space structure construction has shifted focus on materials that are ultra lightweight, have high strength, have low package volume and possess excellent damping characteristics. Substantial damping is required in space since there is no surrounding medium to provide damping. Such a construction uses composites in a fabric form that displays viscoelastic behavior. The viscoelastic behavior is attributed t

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32

Jansson, Robert. "Simulation and study of passive shunt damping of a composite plate by embedded PZT transducers." Thesis, KTH, Lättkonstruktioner, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198532.

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This report investigates the possibility of simulating a fiber composite plate with embedded piezoelectric transducers connected to shunt circuits in order to control vibration. The simulation model is validated in steps of discipline, both analytic and experimentally. First the piezoelectric material used is studied where comparisons are done between analytic and numerical results to ensure electromechnical coupling. Next the interaction with structures are studied by bonding piezoelectric transducers to an aluminum cantilever and study the structural response, where numerical results are com

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Chen, Chen. "Simulation, design and experimental validation of a passive magnetic damper for ultra-fast actuators." Thesis, KTH, Elektroteknisk teori och konstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153639.

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A contact system driven by a high energetic Thomson actuator requires to be decelerated from full speed down to zero. The forces originated from the interaction between a stationary copper tube and a moving array of magnets combined with plastic or ferromagnetic material are used to generate eddy-current damping. Five different configurations of small but strong (N52) neodymium magnets and spacers were benchmarked for simple free-fall damping. A comparison between experimental results and simulations (using COMSOL) has shown that the most effective damping is reached by two consecutive permane

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34

Maurini, Corrado. "ELECTROMECHANICAL COUPLING OF DISTRIBUTED PIEZOELECTRIC TRANSDUCERS FOR PASSIVE DAMPING OF STRUCTURAL VIBRATIONS: COMPARISON OF NETWORK CONFIGURATIONS." Phd thesis, Virginia Tech, 2002. http://tel.archives-ouvertes.fr/tel-00994396.

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In this work passive piezoelectric devices for vibration damping are studied. It is developed the basic idea of synthesizing electrical wave guides to obtain an optimal electro-mechanical energy exchange and therefore to dissipate the mechanical vibrational energy in the electric form. Modular PiezoElectroMechanical (PEM) structures are constituted by continuous elastic beams (or bars) coupled, by means of an array of PZT transducers, to lumped dissipative electric networks. Both refined and homogenized models of those periodic systems are derived by an energetic approach based on the principl

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35

Velazquez, Carlos A. "Electromechanical surface damping combining constrained layer and shunted piezoelectric materials with passive electrical networks of second order /." Online version of thesis, 1995. http://hdl.handle.net/1850/12217.

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36

Plattenburg, Joseph Allan. "Development of Refined Analytical Vibration Models for Plates and Shells with Combined Active and Passive Damping Treatments." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460578500.

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37

Vigier, Yves. "Matériaux composites à fibres piézoélectriques pour applications en contrôle de vibrations : élaboration, modélisation, caractérisation." Chambéry, 2001. http://www.theses.fr/2001CHAMS019.

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38

Marshall, Justin D. "Development, Analysis and Testing of a Hybrid Passive Control Device for Seismic Protection of Framed Structures." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/30152.

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A new seismic protection strategy called the hybrid passive control device (HPCD) has been developed which combines typical passive energy dissipation devices. It consists of a high damping rubber (HDR) sandwich damper in series with a buckling restrained brace (BRB). The HPCD provides energy dissipation at small deformations without significantly decreasing the structural period. The significant energy dissipation capacity of a BRB is provided for significant seismic events in the second phase. The transition between these two phases consists of an increasing stiffness as the device transitio

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Ayoub, Ayoub, and Carl Martin Berg. "Design of a Dynamic Boom Suspension System in a Hybrid Wheel Loader." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-39740.

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Wheel loaders are under the influence of low frequency vibrations that may be harmful for the health of the operator, and for the productivity of the machine. The strong vibrations can significantly impact the operation of the machine since they are not equipped with wheel suspension systems and due to their work environment in rough terrains with uneven surfaces. The risk of spilling or dropping the load is also increased and they can introduce higher mechanical stress that can wear out parts faster. The focus of this thesis work is to develop an approach for damping these vibrations dynamica

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Lossouarn, Boris. "Multimodal vibration damping of structures coupled to their analogous piezoelectric networks." Thesis, Paris, CNAM, 2016. http://www.theses.fr/2016CNAM1062/document.

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L'amplitude vibratoire d'une structure mince peut être réduite grâce au couplage électromécanique qu'offrent les matériaux piézoélectriques. En termes d'amortissement passif, les shunts piézoélectriques permettent une conversion de l'énergie vibratoire en énergie électrique. La présence d'une inductance dans le circuit crée une résonance électrique due à l'échange de charges avec la capacité piézoélectrique. Ainsi, l'ajustement de la fréquence propre de ce shunt résonant à celle de la structure mécanique équivaut à la mise en œuvre d'un amortisseur à masse accordée. Cette stratégie est étendue

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井上, 剛志, Tsuyoshi INOUE, 幸男石田, Yukio ISHIDA, 正貴角 та Masaki SUMI. "電磁共振ダンパによる振動制御". 日本機械学会, 2004. http://hdl.handle.net/2237/8977.

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Darleux, Robin. "Development of analogous piezoelectric networks for the vibration damping of complex structures." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAC011.

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Cette thèse de doctorat s'intéresse au développement de réseaux piézoélectriques analogues pour l'amortissement vibratoire de structures complexes. L'objectif est de réduire les vibrations des modes de plus grandes longueur d'ondes de structures, qui sont recouvertes de patchs piézoélectriques dans ce but. Ces patchs permettent de coupler les structures à des réseaux qui présentent des propriétés identiques de propagation d'onde. On obtient de cette façon un amortissement multimodal de la structure. Pour ce faire, on détaille une méthode permettant de définir l'analogue électrique de toute str

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Hazard, Laurent. "Design of viscoelastic damping for noise & vibration control: modelling, experiments and optimisation." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210772.

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The scope of this research concerns the passive damping of structural vibrations by the use of viscoelastic layers. It is motivated by the need for efficient numerical tools to deal with the medium frequency behaviour of industrial viscoelastic sandwich products. The sandwich modelling technique is based on the use of an interface element: the two deformable plates are modelled by special plate elements while the intermediate dissipative layer is modelled with interface elements. This interface element is based on the first-order shear deformation theory and assume constant peel and shear stre

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Kruep, Stephanie Jean. "Using Incremental Dynamic Analysis to Visualize the Effects of Viscous Fluid Dampers on Steel Moment Frame Drift." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/34122.

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This thesis presents the details of a study regarding both the use of linear viscous fluid dampers in controlling the interstory drift in steel moment frames, and the use of incremental dynamic analysis as a method of visualizing the behavior of these moment frames when subjected to seismic load effects. Models of three story and nine story steel moment frames were designed to meet typical strength requirements for office buildings in Seattle, Washington. These models were intentionally designed to violate seismic interstory drift restrictions to test the ability of the linear viscous fluid

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Wahid, Ferdus. "Analysis Of A Wave Power System With Passive And Active Rectification." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-425722.

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Wave energy converter (WEC) harnesses energy from the ocean to produce electrical power. The electrical power produced by the WEC is fluctuating and is not maximized as well, due to the varying ocean conditions. As a consequence, without any intermediate power conversion stage, the output power from the WEC can not be fed into the grid. To feed WEC output power into the grid, a two-stage power conversion topology is used, where the WEC output power is first converted into DCpower through rectification, and then a DC-AC converter (inverter) is used to supply AC power into the grid. The main mot

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Windén, Björn. "Anti Roll Tanks in Pure Car and Truck Carriers." Thesis, KTH, Aeronautical and Vehicle Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10968.

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<p>This is a master thesis conducted at KTH Centre for Naval Architecture in collaboration with Wallenius Marine AB.</p><p>Rolling motions is something that is undesired in all kinds of seafaring. In terms of propulsion resistance, comfort and route planning it would be desirable to reduce these motions. This thesis is an investigation on how different roll stabilising systems affect the performance of an 8000 unit PCTC vessel, special emphasis is put on investigating the performance of anti roll tanks. The ship in question has a recorded incidence of parametric rolling and the ability of the

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Eltaeb, Mohamed A. "Active Control of Pendulum Tuned Mass Dampers for Tall Buildings Subject to Wind Load." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton150343994189116.

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Sher, Branca Rosa Ribeiro Leite de Sousa. "Optimisation of viscoelastic treatments using genetic algorithms." Doctoral thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12431.

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Doutoramento em Engenharia Mecânica<br>Viscoelastic treatments are one of the most efficient treatments, as far as passive damping is concerned, particularly in the case of thin and light structures. In this type of treatment, part of the strain energy generated in the viscoelastic material is dissipated to the surroundings, in the form of heat. A layer of viscoelastic material is applied to a structure in an unconstrained or constrained configuration, the latter proving to be the most efficient arrangement. This is due to the fact that the relative movement of both the host and constraining l

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Marsh, Robert Ashall. "Passive Earth Pressures on a Pile Cap with a Dense Sand Backfill." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1958.

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Abstract:

Pile groups are often used to provide support for structures. Capping a pile group further adds to the system's resistance due to the passive earth pressure from surrounding backfill. While ultimate passive earth pressure under static loading conditions can be readily calculated using several different theories, the effects of cyclic and dynamic loading on the passive earth pressure response are less understood. Data derived from the full-scale testing of a pile cap system with a densely compacted sand backfill under static, cyclic, and dynamic loadings was analyzed with particular focus on so

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Le, Toan T. "A Single-Stage Passive Vibration Isolation System for Scanning Tunneling Microscopy." DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2272.

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Scanning Tunneling Microscopy (STM) uses quantum tunneling effect to study the surfaces of materials on an atomic scale. Since the probe of the microscope is on the order of nanometers away from the surface, the device is prone to noises due to vibrations from the surroundings. To minimize the random noises and floor vibrations, passive vibration isolation is a commonly used technique due to its low cost and simpler design compared to active vibration isolation, especially when the entire vibration isolation system (VIS) stays inside an Ultra High Vacuum (UHV) environment. This research aims t

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