Дисертації з теми "Dynamic stiffne"
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RAGNI, DAVIDE. "Dynamic testing for the characterisation of bituminous interlayers." Doctoral thesis, Università Politecnica delle Marche, 2020. http://hdl.handle.net/11566/274616.
Повний текст джерелаThe traffic loading on pavement structures includes both vertical and horizontal stresses (normal and tangent to the pavement surface). The latter become critical in regions that are prone to frequent braking, cornering or on steep grades. Since bituminous pavement is a multilayer structure, the existence of a poor interlayer bonding between bituminous layers could adversely affect the pavement performance and serviceability. Hence, a proper evaluation of the interlayer bonding has the utmost importance in pavement performance. The evaluation of interlayer bonding in bituminous pavements is typically carried out by measuring the interlayer shear strength (ISS) at failure using static laboratory tests. A significant improvement of the current testing approach is the development of dynamic testing devices, which could simulate the field conditions more realistically since the traffic loads applied to the pavement are dynamic. In this context, this PhD thesis describes the experimental activities carried out at Università Politecnica delle Marche, North Carolina State University and University of Limoges within the Task Group 3 “Pavement multilayer system” of the RILEM TC 272-PIM. The activities focused on the design and development of a new testing device for performing dynamic interlayer bond testing at Università Politecnica delle Marche along with carrying out dynamic bond testing using other existing devices. The interlayer behaviour has been investigated through both direct shear and torque tests on double-layered specimens extracted from laboratory compacted slabs prepared using a single bituminous mixture. The stimulating results presented in this thesis, reported both in terms of stiffness and cumulative damage, showed that dynamic bond testing can successfully be used to evaluate the bituminous interlayer performance and can provide a noticeable help for defining the service life of the pavement sections realistically compared to the static bond tests.
周婉娥 and Wan-E. Zhou. "The dynamic stiffness method." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31235487.
Повний текст джерелаLeung, A. Y. T. "Dynamic stiffness and substructures." Thesis, Aston University, 1993. http://publications.aston.ac.uk/21737/.
Повний текст джерелаZhou, Wan-E. "The dynamic stiffness method /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19668612.
Повний текст джерелаAlley, Ferryl. "Dynamic ankle stiffness during upright standing." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110417.
Повний текст джерелаLes études de la posture érigée sont couramment fondées sur le modèle biomécanique du pendule inversé définissant une raideur posturale générale produite par les articulations des chevilles et nécessaire pour compenser les effets déstabilisants de la gravité. Ce modèle est basé sur l'hypothèse d'une raideur symétrique des chevilles gauche et droite qui demeure fixe pendant la tenue de la posture érigée. Toutefois, les contributions relatives des composantes intrinsèques et réflexes de la raideur dynamique ainsi que l'interaction des membres inférieurs pendant la position érigée debout ne sont pas bien comprises. Ce mémoire fait état d'une estimation de la raideur dynamique des deux chevilles simultanément durant la position érigée debout, ainsi que d'une étude de la coordination entre les deux membres. Au cours de tests de perturbation bilatérale, pendant lesquels des perturbations de la position angulaire ont été appliquées aux deux chevilles simultanément, une nette réponse intrinsèque et réflexe a été observée. Chez tous les sujets, la raideur intrinsèque était inférieure à la raideur posturale nécessaire pour maintenir la station debout. La raideur dynamique des chevilles a également évolué en fonction de différents niveaux du couple du balancement postural, de telle sorte que la raideur intrinsèque et réflexe était plus élevée pendant l'inclinaison avant et moins élevée pendant l'inclinaison arrière. Des réponses controlatérales ont été observées entre la position de départ de la cheville et les couples générés depuis la cheville opposée. Ces résultats donnent à penser que le contrôle postural général ne consiste pas en la simple sommation de réponses indépendantes fixes de raideur intrinsèque des chevilles individuelles. La raideur élastique intrinsèque ne suffit pas pour maintenir l'équilibre, et les voies de raideur contributives sont modulées pendant le balancement de la position érigée debout. Les modèles de la position érigée debout doivent intégrer des mesures de la raideur dynamique des chevilles, des paramètres variables de la raideur et des interactions entre les membres d'appui.
郭騰川 and Tang-chuen Nick Kwok. "Dynamic stiffness method for curved structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31212359.
Повний текст джерелаKwok, Tang-chuen Nick. "Dynamic stiffness method for curved structures /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19672421.
Повний текст джерелаVega, González Myraida Angélica. "Dynamic study of tunable stiffness scanning microscope probe." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32967.
Повний текст джерелаIncludes bibliographical references (leaf 31).
This study examines the dynamic characteristics of the in-plane tunable stiffness scanning microscope probe for an atomic force microscope (AFM). The analysis was carried out using finite element analysis (FEA) methods for the micro scale device and its macro scale counterpart, which was designed specifically for this study. Experimental system identification testing using sound wave and high-speed camera recordings was clone on the macro scale version to identify trends that were then verified in the micro scale predictions. The results for the micro scale device followed the trends predicted by the macro scale experimental data. The natural frequencies of the device corresponded to the three normal directions of motion, in ascending order from the vertical direction, the out-of- plane direction, and the horizontal direction. The numerical values for these frequencies in the micro scale are 81.314 kHz, 51.438 kHz, and 54.899 kHz for the X, Y, and Z directions of vibration respectively. The error associated with these measurements is 6.6% and is attributed to the high tolerance necessary for measurements in the micro scale, which was not matched by the macro scale data acquisition methods that predict the natural frequency range.
(cont.) The vertical vibrations are therefore the limiting factor in the scanning speed of the probe across a sample surface, thus requiring the AFM to scan at an effective frequency of less than 81.3 kHz to avoid resonance.
by Myraida Angélica Vega González.
S.B.
Black, Thomas Andrew. "Spectral Element Analysis of Bars, Beams, and Levy Plates." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/33260.
Повний текст джерелаMaster of Science
Black, T. Andrew. "Spectral Element Analysis of Bars, Beams, and Levy Plates." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33260.
Повний текст джерелаMaster of Science
SIVORI, DANIELE. "Ambient vibration tools supporting the model-based seismic assessment of existing buildings." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1045713.
Повний текст джерелаGupta, Sayan. "Vibration Analysis Of Structures Built Up Of Randomly Inhomogeneous Curved And Straight Beams Using Stochastic Dynamic Stiffness Matrix Method." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/224.
Повний текст джерелаGarcia, Maria-José. "Engineering rubber bushing stiffness formulas including dynamic amplitude dependence." Licentiate thesis, KTH, Aeronautical and Vehicle Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4017.
Повний текст джерелаEngineering design models for the torsion and axial dynamic stiffness of carbon black filled rubber bushings in the frequency domain including amplitude dependence are presented. They are founded on a developed material model which is the result of applying a separable elastic, viscoelastic and friction rubber component model to the material level. Moreover, the rubber model is applied to equivalent strains of the strain states inside the torsion or axial deformed bushing previously obtained by the classical linear theory of elasticity, thus yielding equivalent shear moduli which are inserted into analytical formulas for the stiffness. Therefore, unlike other simplified approaches, this procedure includes the Fletcher-Gent effect inside the bushing due to non-homogeneous strain states. The models are implemented in Matlab®. In addition, an experimental verification is carried out on a commercially available bushing thus confirming the accuracy of these models which become a fast engineering tool to design the most suitable rubber bushing to fulfil user requirements. Finally, they can be easily employed in multi-body and finite element simulations
Garcia, Maria-José. "Engineering rubber bushing stiffness formulas including dynamic amplitude dependence /." Stockholm : Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4017.
Повний текст джерелаCarrella, Alessandro. "Passive vibration isolators with high-static-low-dynamic-stiffness." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/51276/.
Повний текст джерелаJohnson, Stephanie. "Pediatric Dynamic Shoulder Stiffness Predicted From Quasi-Static Impacts." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1483704973274323.
Повний текст джерелаEl-Tayeb, Nabil Said Mohamed. "The dynamic properties of ball bearings." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366386.
Повний текст джерелаBerggren, Eric. "Railway Track Stiffness : Dynamic Measurements and Evaluation for Efficient Maintenance." Doctoral thesis, KTH, Farkost och flyg, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10360.
Повний текст джерелаQC 20100623
Cheng, Yongming 1964. "Dynamic stiffness and transfer matrix analysis of marine riser vibration." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/107859.
Повний текст джерелаYuan, Han. "Static and dynamic stiffness analysis of cable-driven parallel robots." Thesis, Rennes, INSA, 2015. http://www.theses.fr/2015ISAR0003/document.
Повний текст джерелаThis thesis contributes to the analysis of the static and dynamic stiffness of cable-driven parallel robots (CDPRs) aiming to improve the static positioning accuracy and the trajectory tracking accuracy. The proposed static and dynamic cable modeling considers the effect of cable weight on the cable profile and the effect of cable mass on the cable dynamics. Based on the static cable model, the static pose error of the end-effector is defined and the variation of the end-effector pose error with the external load is used to evaluate the static stiffness of CDPRs. A new dynamic model of CDPRs is proposed with considering the coupling of the cable dynamics and the end-effector vibrations. Experimental validations are carried out on CDPR prototypes. Static experiments, modal experiments, free vibration experiments and trajectory experiments are performed. The proposed static and dynamic models are verified. Cable dynamics, robot dynamics and their coupling are discussed. Results show the relevance of the proposed models on improving the performances of CDPRs in terms of design and control. Besides stiffness analysis, the proposed models are applied on the force distribution of redundant actuated CDPRs. A new method on the calculation of the cable forces is proposed, where the determination of the lower-boundary of the cable forces is presented. The consideration of the pose-dependence of the lower force boundary can minimize the cable forces and improve the energy efficiency of CDPRs
Krupa, Lukáš. "Výpočtová simulace vibrací gumového silentbloku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382554.
Повний текст джерелаHe, Siqian. "Statistics and dynamics of stiff chains." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38400.
Повний текст джерелаSmith, Jeremy Richard Denham. "Statistical energy analysis of marine structures with periodic and near-periodic components." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287051.
Повний текст джерелаMiller, Joel Christopher. "Modulating dynamic stiffness of a direct-drive brushless linear DC motor." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/16103.
Повний текст джерелаAndersson, Patrik. "Finite Element and Dynamic Stiffness Analysis of Concrete Beam-Plate Junctions." Thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198509.
Повний текст джерелаHYLOK, JEFFERY EDWARD. "EXPERIMENTAL IDENTIFICATION OF DISTRIBUTED DAMPING MATRICES USING THE DYNAMIC STIFFNESS MATRIX." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1029527404.
Повний текст джерелаPasha, Hasan G. "Estimation of Static Stiffnesses from Free Boundary Dynamic (FRF) Measurements." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416569956.
Повний текст джерелаRoach, M. P. "Vibration control in rotating machinery using variable dynamic stiffness hydrostatic squeeze-films." Thesis, Staffordshire University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254234.
Повний текст джерелаHarrison, Christopher. "The detection of delaminations in vibrating composite beams." Thesis, University of Bath, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323574.
Повний текст джерелаNarby, Erik. "Modeling and Estimation of Dynamic Tire Properties." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6153.
Повний текст джерелаInformation about dynamic tire properties has always been important for drivers of wheel driven vehicles. With the increasing amount of systems in modern vehicles designed to measure and control the behavior of the vehicle information regarding dynamic tire properties has grown even more important.
In this thesis a number of methods for modeling and estimating dynamic tire properties have been implemented and evaluated. The more general issue of estimating model parameters in linear and non-linear vehicle models is also addressed.
We conclude that the slope of the tire slip curve seems to dependent on the stiffness of the road surface and introduce the term combined stiffness. We also show that it is possible to estimate both longitudinal and lateral combined stiffness using only standard vehicle sensors.
Fargač, Michal. "Výpočtová analýza stojanu pro horizontální vyvrtávací centrum." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254417.
Повний текст джерелаJoodi, Benjamin Michael. "Comparative Assessment of Frequency Dependent Joint Properties Using Direct and Inverse Identification Methods." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1417024616.
Повний текст джерелаMaolin, Liao. "Dynamic methods of stiffness identification in impacting systems for rotary-percussive drilling applications." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=230156.
Повний текст джерелаKoko, Tamunoiyala Stanley. "Super finite elements for nonlinear static and dynamic analysis of stiffened plate structures." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30723.
Повний текст джерелаApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Berggren, Eric. "Dynamic track stiffness measurement : a new tool for condition monitoring of track substructure /." Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-341.
Повний текст джерелаKareaga, Laka Zorion. "Dynamic stiffness and damping prediction on rubber material parts, FEA and experimental correlation." Thesis, London Metropolitan University, 2016. http://repository.londonmet.ac.uk/1125/.
Повний текст джерелаLi, Xiaoming. "The effect of stiffness and mass on the dynamic response of wood floors." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06112009-063311/.
Повний текст джерелаSchifter, Josh. "The effects of bending stiffness on the dynamics of catenary cables." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10687.
Повний текст джерелаMahan, Amir. "Dynamic Response of a Tied Arch Bridge to a Choice of Loading & Operation Conditions : A case study of the Urmia Lake Bridge." Thesis, KTH, Bro- och stålbyggnad, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36791.
Повний текст джерелаWong, Kin Ming. "Evolutionary structural form optimisation for lateral stiffness design of tall buildings /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20WONGK.
Повний текст джерелаKumar, Naren. "Investigation of drive-train dynamics of mechanical transmissions incorporating cycloidal drives." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/84752/8/Naren%20Kumar%20Thesis.pdf.
Повний текст джерелаTufano, Saverio. "Dynamic response of the coupled human body and seat in vertical and fore-and-aft direction." Thesis, Universita' degli Studi di Catania, 2011. http://hdl.handle.net/10761/373.
Повний текст джерелаDodgen, Eric Ray. "Spinal Implant with Customized and Non-Linear Stiffness." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2699.
Повний текст джерелаDevarajan, Balakrishnan. "Thermomechanical and Vibration Analysis of Stiffened Unitized Structures and Threaded Fasteners." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/99425.
Повний текст джерелаPHD
Syk, Annelie, and Erik Axelsson. "Effect of axle load spreading and support stiffness on the dynamic response of short span railway bridges." Thesis, KTH, Bro- och stålbyggnad, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137118.
Повний текст джерелаBalupari, Raja Shekar. "VALIDATION OF FINITE ELEMENT PROGRAM FOR JOURNAL BEARINGS -- STATIC AND DYNAMIC PROPERTIES." UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/325.
Повний текст джерелаMa, Qinglong. "A study of the dynamic behavior of piecewise nonlinear oscillators with time-varying stiffness." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1127847551.
Повний текст джерелаHannon, Ashley. "Dynamic strain profile of the ice hockey stick: Comparisons of calibre and shaft stiffness." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95241.
Повний текст джерелаL'objectif principal de cette étude était de développer une méthode pour la quantification des différents profils de déformation dynamique de bâtons de hockey et de utiliser qu'est méthode pour examiner l'influence cinématiques du des joueurs de niveau élite et des joueurs de niveau récréatif pour les lancers frappes (SS) et des tirs du poignet (WS). Dix-sept sujets males ont donc effectué en laboratoire une série SS et de WS avec deux bâtons de hockey différent sur une surface de glace synthétique et étaient divisés en deux groupes, un pour le niveau élite et l'autre pour le niveau récréatif. Les mensures dépendantes étaient 1) la déformation du bâton a cinq étroits sur le manche du bâton à l'aide d'un système maison enregistrant à une fréquence de 10 KHz, et 2)la cinématique du bâton, de la rondelle et du membre supérieur le plus bas sur le bâton ont été enregistré à une fréquence de 300 Hz à l'aide d'un système Vicon MX . Deux MANOVA de forme 2x2 ont été effectuées, une pour les lancers frappés ainsi qu'une pour les lancers du poignet. Les résultats ont démontré la faisabilité de la quantification des différents profils de déformation dynamique de bâtons telle que l'ordre de classement sans ambigüité en réponse contrainte maximale a été obtenue. Des différences ont été trouvées pour la déformation aux différents capteurs à travers les niveaux d'habileté ainsi qu'à travers les bâtons. La déformation maximale était différente dépendamment du calibre et du bâton et ce pour les deux types de lancer. De plus, les joueurs de calibre récréatifs ont démontrés un délai significativement plus long entre la déformation maximal et le début du lancer pour les lancers frappés. Des différences cinématiques ont été trouvées au moins flexion du coude entre les calibres pour le niveau élite pour les lancers frappés et plus flexion pour le poignet pour les tirs du poignet pour le n
Frohling, Robert Desmond. "Deterioration of railway track due to dynamic vehicle loading and spatially varying track stiffness." Thesis, Pretoria : [s.n.], 1997. http://upetd.up.ac.za/thesis/available/etd-01122009-160350.
Повний текст джерелаSchafman, Michelle Ann. "Dynamic Structural Properties of Human Ribs in Frontal Loading." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429018120.
Повний текст джерела