Dissertations / Theses on the topic 'Damping'
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Olsen, Mary W., and Deborah Young. "Damping Off." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011. http://hdl.handle.net/10150/144802.
Full textOriginally published: 1998
Damping off is caused by several different fungi under different environmental conditions. The fungi include Pythium, Rhizoctonia solani, and Thielaviopsis basicola. This article discusses the symptoms, environmental conditions, diseases, prevention and control methods for the damping-off caused by fungi.
Rappeline, Peter Frederick. "The microstructural basis of damping in high damping alloys." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27132.
Full textPenetrante, Wendel D. "Calculating required substructure damping to meet prescribed system damping levels." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Jun%5FPenetrante.pdf.
Full textThesis Advisor(s): Joshua Gordis. "June 2007." Includes bibliographical references (p. 73-74). Also available in print.
Prandina, Marco. "Spatial damping identification." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533930.
Full textDew, Dwight D. "Strain dependent damping characteristics of a high damping manganese-copper alloy." Thesis, Monterey, California: U.S. Naval Postgraduate School, 1986. http://hdl.handle.net/10945/22121.
Full textLabonnote, Nathalie. "Damping in Timber Structures." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for konstruksjonsteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18168.
Full textMessalti, Mansour. "Viscoelastic damping of beams /." Online version of thesis, 1988. http://hdl.handle.net/1850/10414.
Full textAndré, Samuel. "Optimization of Valve Damping." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-104862.
Full textHsu, Yi-Chu. "Damping treatments for microstructures /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/7054.
Full textMuratani, Keiichi, Satoshi Kito, Yoshito Itoh, Yasuo Kitane, and Paramashanti. "Experimental investigation of aging effect on damping ratio of high damping rubber bearing." 土木学会, 2011. http://hdl.handle.net/2237/18847.
Full textMORENO, FRANCO OLMO ALONSO. "The Shape of Damping: Optimizing Damping Coefficients to Improve Transparency on Bilateral Telemanipulation." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/939640.
Full textBiggerstaff, Janet M. "Vibrational Damping of Composite Materials." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3204578.
Full textTitle from first page of PDF file (viewed April 3, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 218-224).
Dwivedi, Tashi. "Aerodynamic damping in lateral buffeting." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9204.
Full textGraves, Kynan E., and kgraves@swin edu au. "Electromagnetic energy regenerative vibration damping." Swinburne University of Technology, 2000. http://adt.lib.swin.edu.au./public/adt-VSWT20060307.120939.
Full textGilmore, Keith. "Precession Damping in Itinerant Ferromagnets." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/gilmore/GilmoreK1207.pdf.
Full textNadampalli, Ravi Varma. "Interface Damping: Characterization and Implementation." Licentiate thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93413.
Full textQC 20120424
Kandil, Mohamed Abdelhadi. "On rotor internal damping instability." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421790.
Full textLord, Charles. "Damping effects of debonded composites." Thesis, University of Sheffield, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577524.
Full textAyllon, Rolando. "Cyclotron Damping in Magnetized Plasmas." Thesis, Umeå universitet, Institutionen för fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-99662.
Full textBolter, J. D. "Active damping of framework vibrations." Thesis, University of Leeds, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382018.
Full textSimeone, Luigi. "Nonlinear damping in energy harvesters." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/426890/.
Full textGutierrez, Homero L. (Homero Luis). "Damping formulations in substructure synthesis." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/47363.
Full textWu, Jiun-Yan 1972. "Extracting damping ratios using wavelets." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8618.
Full textIncludes bibliographical references (leaves 87-88).
The focus of this work is to evaluate the accuracy of methods for extracting damping ratios with respect to: three extraction methods, different damping ratios, added noisy data, separated modes and close modes. To achieve this goal, a simulated analytical signal is analyzed by estimating the modal parameters. The simulated analytic signal is useful because the exact values are known and the characteristic of the FRF can be varied in order to observe how the accuracy of damping ratios is affected. Results show that the Continuous Wavelet Transform method gives the most accurate estimations even for data corrupted by the noise. The Complex Exponential method presents better results in the cases with higher modes and higher damping ratios without the noise. Wavelet Packet method and Continuous Wavelet Transform method are more suitable in the cases for extracting lower damping ratios than those for higher damping ratios even for data corrupted by the noise. And in general, the estimation results are more accurate in the cases with separated modes than those with close modes.
by Jiun-Yan Wu.
M.Eng.
Gessel, David Jacob. "Impulse damping in structural materials." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/49583.
Full textAnasavarapu, Srikantha Phani. "Damping identification in linear vibration." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615994.
Full textAdhikari, Sondipon. "Damping models for structural vibration." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620975.
Full textBajalan, Hamid. "Damping in zinc-based alloys." Thesis, Aston University, 1993. http://publications.aston.ac.uk/15271/.
Full textWest, Ray A. "Damping of elastic-viscoelastic beams /." Online version of thesis, 1992. http://hdl.handle.net/1850/11111.
Full textEhnes, Charles W. "Damping in stiffener welded structures." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FEhnes.pdf.
Full textNygren, Björn. "Angle Damping in Bundle Adjustment." Thesis, Umeå universitet, Institutionen för fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-160547.
Full textBolduc, Maxime. "Acquiring statistical energy analysis damping loss factor for complex structures with low to high damping characteristics." Thèse, [S.l. : s.n.], 2007. http://savoirs.usherbrooke.ca/handle/11143/1801.
Full textTing-Kong, Christopher. "Design of an adaptive dynamic vibration absorber." Title page, contents and abstract only, 1998. http://thesis.library.adelaide.edu.au/adt-SUA/public/adt-SUA20010220.212153.
Full textBarsallo, Pacheco Nilma Rosa. "Material and Damping Characterization of Discretized Adhesive Tapes in Cantilever Beams undergoing Free and Forced Vibration." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64357.
Full textMaster of Science
Bournine, Hadjila. "Bolted friction columns for structural damping." Thesis, University of Bristol, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555725.
Full textKitching, Kevin John. "Semi-active damping of heavy vehicles." Thesis, University of Cambridge, 1997. https://www.repository.cam.ac.uk/handle/1810/265419.
Full textGanguli, ABHIJIT. "Chatter reduction through active vibration damping." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210980.
Full textThe regenerative process theory explains chatter as a closed loop interaction between the structural dynamics and the cutting process. This is considered to be the most dominant reason behind machine tool chatter although other instability causing mechanisms exist.
The stability lobe diagram provides a quantitative idea of the limits of stable machining in terms of two physical parameters: the width of contact between tool and the workpiece, called the width of cut and the speed of rotation of the spindle. It is found that the minimum value of the stability limit is proportional to the structural damping ratio for turning operations. This important finding provides the motivation of influencing the structural dynamics by active damping to enhance stability limits of a machining operation.
A direct implementation of active damping in an industrial environment may be difficult. So an intermediate step of testing the strategy in a laboratory setup, without conducting real cutting is proposed. Two mechatronic "Hardware in the Loop" simulators for chatter in turning and milling are presented, which simulate regenerative chatter experimentally without conducting real cutting tests. A simple cantilever beam, representing the MDOF dynamics of
the machine tool structure constitutes the basic hardware part and the cutting process is simulated in real time on a DSP board. The values of the cutting parameters such as spindle speed and the axial width of cut can be changed on the DSP board and the closed loop interaction between the structure and the cutting process can be led to instability.
The demonstrators are then used as test beds to investigate the efficiency of active damping, as a potential chatter stabilization strategy. Active damping is easy to implement, robust and does not require a very detailed model of the structure for proper functioning, provided a collocated sensor and actuator configuration is followed. The idea of active damping is currently being implemented in the industry in various metal cutting machines as part of the European Union funded SMARTOOL project (www.smartool.org), intended to propose smart chatter control technologies in machining operations.
Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished
Vlassenbroek, Alain. "Radiation damping in High Resolution NMR." Doctoral thesis, Universite Libre de Bruxelles, 1993. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212811.
Full textSun, Jia. "Rotating Structure Modeling and Damping Measurements." Licentiate thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-31161.
Full textQC 20110311
Pelletier, Michel 1964. "Adaptive damping control for robotic teleoperation." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55621.
Full textAwang, Jusoh. "Active damping of DC power networks." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.559484.
Full textAlgozzini, Lee. "MULTIFUNCTIONAL NANOCOMPOSITES FOR HIGH DAMPING PERFORMANCE." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4454.
Full textM.S.
Department of Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
Mechanical, Materials and Aerospace Engineering
Wong, Seck Jiong. "Thermoelastic damping in MEMS ring resonators." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431849.
Full textZhu, Jianfeng. "Vibration suppression by using magnetic damping." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440844.
Full textAntler, Natania. "Passive damping of a LIGO mirror." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/51612.
Full textIncludes bibliographical references (p. 75-76).
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 with Fabry-Perot cavities in the arms. In order to detect gravitational waves, LIGO must be sensitive to relative displacements on the order of 10-18 m. Advanced LIGO, a detector upgrade, is projected to achieve a tenfold increase in sensitivity through a wide range of new technologies and techniques. One proposed change is to increase the laser power in the cavities from ~10 W to ~180 W. There is concern that with this increased radiation pressure, optical modes in the cavity may overlap with acoustic modes of the mirrors and excite mechanical motion. If such a parametric instability occurs, it will disrupt the operation of the interferometer. In this thesis I test a method to passively damp the acoustic modes of the mirror, using a mass-spring damper. The damper can be modeled as a piezoelectric "spring" (PZT) connected to a seismic mass. The damper can lose energy from both mechanical motion, and motion of charge through a resistor across the PZT.
(cont.) I built a small Michelson interferometer to measure the acoustic modes of an Initial LIGO mirror, excited by an electrostatic drive, while it hung as a pendulum in vacuum. For a 6.6 kHz mode of the mirror, I found that the quality factor, or Q, of the mirror decreased from (7.7 ± 0.1) x 105 to (6.2 ± 0.1) x 103 when the damper was added. The addition of a resistor across the PZT reduced the Q below the measurement threshold.
by Natania Antler.
S.B.
Young, Joseph Y. J. 1968. "Squeeze-film damping for MEMS structures." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/34334.
Full textMarsh, Eric Russell. "An integrated approach to structural damping." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/37726.
Full textDody, Thibault Alexandre. "Damping optimization using transfer function criteria." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82709.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 84-85).
Seismic performance has become a key point in the design of every type of structures. Even the simplest buildings need protection in areas of high seismic activity.However,there is no method defined!by codes or general knowledge to help engineers make choices about the design of seismic protection devices. Even!though several theories to optimize the use of devices have been developed, there is little practical application in!structural engineering. The purpose of this paper is first to settle on the elements that can be used to protect structures. By looking at their effects on structures, it was found that dampers are the easiest to use in an optimization process. After describing the need of progress in the field of earthquake protections, this paper focuses on the impact of additional damping in a 2-D frame. Finally, the method developed by Izuru Takewaki was studied and implemented. By looking at the limitation of the interstory drift, the algorithm produced the optimal distribution of the damping. In order to estimate the performance of! the method, the results were compared to empirical damping distributions. A complete program was developed in order to apply the optimization method to a wide range of custom 2-D frames.
by Thibault Alexandre Dody.
M.Eng.
PENG, WU, and Sebastian Levin. "Chatter Vibration Damping in Parting Tools." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-16798.
Full textEly, Paul T. "Internal Damping Rates of Construction Cranes." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36524.
Full textMaster of Science
Aumjaud, Pierre. "Vibration damping of lightweight sandwich structures." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/20730.
Full text