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Dissertations / Theses on the topic 'Imact dynamics'

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Published: 6 September 2023

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1

Wagg, David James. "Vibro-impact dynamics of engineering systems." Thesis, University College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314220.

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2

Yeow, Hoe Chian. "Soil classification through dynamic soil signatures." Thesis, University of Aberdeen, 1990. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU031990.

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The demand for a cost effective site investigation method has resulted in the introduction of various advanced in-situ testing techniques. These techniques utilise modern electronics instrumentation to monitor various soil parameters during site investigation. The data is then processed using high speed, low cost digital computers which allow an accurate and rapid assessment of the conditions of the foundation soil under a proposed construction site. In this thesis, a site investigation tool that drives a coring tube into the ground under a combination of vibration and impact is considered. Th

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3

Anandika, Muhammad Nevin. "An Experimental Investigation of the Impact of Random Spacing Errors onthe Transmission Error of Spur and Helical Gear Pairs." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574680868815187.

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4

Knudsen, Jakob. "Vibro-impact dynamics of fretting wear." Licentiate thesis, Luleå tekniska universitet, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18592.

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The dynamics and wear of non-linear impact oscillators, comprising a single-degree of freedom system as well as continuous beam systems are analysed. The considered beams are of cantilever type with the lateral motion of the free end constrained by elastic supports. They are modelled as Bernoulli beams with Rayleigh damping. A finite-element method is used for discretisation in space and Newmark's method for time integration. Wear is quantified using the work-rate concept. The model calculations are compared with measurements of contact forces and displacements made on a loosely supported nucl

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5

DI, BENEDETTO GIOVANNI. "Impact dynamics of tool steel penetrators." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2678424.

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Armor-piercing (AP) ammunition generally carries a hard penetrator within a copper jacket. Upon impact on a hard target, the copper case is destroyed, but the penetrator continues its motion and pierces the target. The most efficient AP ammunition is built with penetrators made from either tungsten alloys or depleted uranium, but alloy steel penetrators are also commonly used, because they are less expensive and less polluting, even if they are much less efficient. The impact deformation and fracture behavior of armor-piercing penetrators fabricated with three tool steels, and their res

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6

Gao, Fan. "The Impact Dynamics of Weakly Charged Droplets." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/92888.

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Electric charges are often found in naturally or artificially formed droplets, such as raindrops and those generated by Kelvin's water dropper. In contrast to the impact of neutral droplets on a flat solid surface upon which a thin convex lens shape layer of the gas film is typically formed, I show that the delicate gas thin film can be fundamentally altered for even weakly charged droplets both experimentally and numerically. As the charge level is raised above a critical level of about 1% of the Rayleigh limit for representative impact conditions, the Maxwell stress overcomes the gas pressur

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7

Murias, dos Santos Antonio E. Ferrand de Almeida. "Intertidal ecology of northern Portuguese rocky shores." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326590.

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8

Soundranayagam, Sally Ann. "Investigation of nonlinear transformation of impulses in impact units for improvement of hammer drill performance." Thesis, Loughborough University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324489.

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9

Matzinger, Thomas. "An Overview of Body Armor and Single Plate Impact Dynamics." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1808.

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In the past, personal body armor was constructed of simple plates of high- strength alloys. However, with the advancement of modern combat and weaponry, particularly armor-piercing ammunition, personal body armor has evolved into more complex and effective metal, ceramic, and composite structures. This paper lays the groundwork for experimental and modeling methods used to understand the effectiveness of new armor designs. Focusing on the first layer of modern body armor, the ”High Impedance” layer. Experiments measuring the change in velocity of bullets passing through aluminum and titanium p

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10

Emms, Rhys Mullin. "Impact of Plasma Dynamics On Femtosecond Filamentation." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35126.

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In this thesis we ran a series of 2D simulations of femtosecond laser pulses filamenting in air using the FDTD method, a saturable Lorentz oscillator model of air [1], and two separate models of plasma: a Drude model where the plasma density is static in space, and a particle-in-cell model where plasma is free to migrate throughout the simulation space. By comparing matched pairs of simulations, which varied in pulse size, duration, and intensity, we can gauge the impact plasma dynamics has upon the evolution of a filamenting laser pulse. From these tests we determine that, while there are som

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11

Qiu, Jin 1974. "Modeling of plate impact dynamics and noise." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80514.

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12

Feroz, Kottamal Thanduparakal. "Impact dynamics of rods, beams and panels." Thesis, University of Manchester, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488081.

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A methodology to study the impact dynamics of rods, beams and panels using modern numerical solution technique and instrumentation is developed. The numerical study is carried out using the commercial finite element package ABAQUS. The general approach of this tool is illustrated and verified for the static analysis of the stress distribution in a castellated beam and for the dynamic analysis of a cantilevered beam subjected to multiple impact loading. The finite element analysis technique is used to assess the optimal performance of steel plate panels of different cross-sections and thickness

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13

Sharker, Saberul Islam. "Water Entry Impact Dynamics of Diving Birds." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6441.

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Some seabirds (such as Northern Gannets and Brown Boobies) can dive from heights as high as 30 m reaching speeds of up to 24 m/s as they impact the water surface. It is perceived that physical geometry, particularly of the beak, allows them to endure relatively high impact forces that could otherwise kill non-diving birds. Acceleration data from simplified models of diving birds agree with simulated data for one species (Northern Gannet), however, no reliable experimental data with real bird geometries exist for comparison purposes. This study utilizes eleven 3D printed diving birds (five plun

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14

BARDINI, LAURA. "Impact of hyporheic zones on nutrient dynamics." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2507376.

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Riverine sediments play a fundamental role within the fluvial system, since they represent potential removal zones of stream-borne pollutants and, in particular, nutrients derived by anthropogenic activities. The region of sediments where the exchange and mixing of surface and subsurface waters occurs is the hyporheic zone. This region is also a place of intense biogeochemical activity, influencing both the flora and the fauna living in the fluvial environment. In the last decades several works were focused either on the water exchanges or the biochemical reactions in the hyporheic zone but ju

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15

Wheeler, Jeffrey M. "Nanoindentation under dynamic conditions." Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/218320.

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Nanoindentation has emerged as a leading technique for the investigation of mechanical properties on small volumes of material. Extensive progress has been made in the last 20 years in refining the nstrumentation of nanoindentation systems and in analysis of the resulting data. Recent development has enabled investigation of materials under several dynamic conditions. The palladium-hydrogen system has a large miscibility gap, where the palladium lattice rapidly expands to form a hydrogen-rich β phase upon hydrogenation. Nanoindentation was used to investigate the mechanical effects of these tr

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16

Eriksson, Johan. "Experimental and numerical studies of nonsmooth mechanical systems : applications of dimension estimation." Licentiate thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-288.

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17

Sim, Min Kyu. "Empirical findings in asset price dynamics revealed by quantitative modelling." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54302.

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This dissertation addresses the fundamental question of what factors drive equity prices and investigates the mechanisms through which the drivers influence the price dynamics. The studies are based on the two different frequency levels of financial data. The first part aims to identify what systematic risk factors affect the expected return of stocks based on historical data with frequency being daily or monthly. The second part aims to explain how the hidden supply-demand of a stock affects the stock price dynamics based on market data observed at frequency levels generally between a mill

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18

Moore, Matthew Richard. "New mathematical models for splash dynamics." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:c94ff7f2-296a-4f13-b04b-e9696eda9047.

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In this thesis, we derive, extend and generalise various aspects of impact theory and splash dynamics. Our methods throughout will involve isolating small parameters in our models, which we can utilise using the language of matched asymptotics. In Chapter 1 we briefly motivate the field of impact theory and outline the structure of the thesis. In Chapter 2, we give a detailed review of classical small-deadrise water entry, Wagner theory, in both two and three dimensions, highlighting the key results that we will use in our extensions of the theory. We study oblique water entry in Chapter 3, in

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19

Movahedi-Lankarani, Hamid. "Canonical equations of motion and estimation of parameters in the analysis of impact problems." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184490.

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The transient dynamic analysis of constrained mechanical systems may require the solution of a mixed set of algebraic and differential equations of motion. The usual formulation of these equations is expressed in terms of the accelerations of the system components. A canonical form of the equations of motion in terms of the system velocities and the time derivative of the system momenta may be used instead. This is a natural form of the equations in which all the state variables are explicitly expressed, and have the same physical importance. The numerical solution obtained from the canonical

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20

Malik, M. A. A. "Limit order book dynamics and market impact estimation." Thesis, University of Essex, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.571506.

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This thesis focuses on two closely related areas of liquidity and market impact. The historic limit order book of Stock Exchange Trading Sys- tem (SETS) operated by the London Stock Exchange (LSE) is rebuilt using this framework for empirical analysis of information contained in the limit order book. The concept of Notional Volume Weighted Average Price (NVWAP) is introduced to construct liquidity supply and demand curves based on real time bid and ask schedules of the full length of the limit or- der book. This unique approach is used to determine how the order book behaves and I find consist

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21

Potter, Andrew Thomas. "The impact of supply chain dynamics on transport." Thesis, Cardiff University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440759.

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22

Skeppström, Lehto Hugo, and Richard Hedlund. "Impact of Vehicle Dynamics Modelling on Feature Based SLAM for Autonomous Racing." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-262646.

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In autonomous racing there is a need to accurately localize the vehicle while simultaneously creating a map of the track. This information can be delivered to planning and control layers in order to achieve fully autonomous racing. The kinematic model is a commonly used motion model in feature-based SLAM. However, it is a poor representation of the vehicle when considering high lateral accelerations since the model is only based on trigonometric relationships. This Master’s Thesis investigates the consequence of using the kinematic model when undertaking demanding maneuvers; and if by switchin

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23

Jafri, Syed M. "Modeling of impact dynamics of tennis ball with a flat surface." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/2441.

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A two-mass model with a spring and a damper in the vertical direction, accounting for vertical translational motion and a torsional spring and a damper connecting the rotational motion of two masses is used to simulate the dynamics of a tennis ball as it comes into contact with a flat surface. The model is supposed to behave as a rigid body in the horizontal direction. The model is used to predict contact of the ball with the ground and applies from start of contact to end of contact. The springs and dampers for both the vertical and the rotational direction are linear. Differential equations

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24

Li, Kuinian. "Impact dampers for structural dynamic control." Thesis, University of Bath, 2004. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409881.

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25

Zhu, Ling. "Dynamic inelastic behaviour of ship plates in collision." Thesis, University of Glasgow, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324960.

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26

Gebhardt, Christoph R. "Reactive cluster impact dynamics and ion processes investigated by cluster impact mass spectrometry." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=962138657.

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27

Cox, Simon John. "Pressure impulses caused by wave impact." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266731.

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28

Ariyo, Adeyemi Idowu. "Droplet Dynamics of Aqueous Polymeric Solutions on Solid Surfaces." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1236212747.

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29

Modarres, Najafabadi Seyed Ali. "Dynamics modelling and analysis of impact in multibody systems." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115886.

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In this thesis, we discuss a novel approach to the dynamics modelling and analysis of impact in unilaterally constrained multibody systems. This approach is based on an analysis of energy absorption and restitution during impact, using a decomposition technique, which decouples the kinetic energy associated with the spaces of admissible and constrained motions of unilateral contacts. This is done based on the decomposition of the tangent space of the configuration manifold at the pre-impact instant. The decomposition of the kinetic energy can provide a picture of how the energy absorption and

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30

Ghazavi, M. R. "Pin dynamics and impact in revolute joints with clearance." Thesis, University of Bath, 1990. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760604.

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31

Kamarainen, Outi Katriina. "Dynamics of ligand-protein interactions : impact on drug discovery." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18445/.

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Introducing a new drug to market is a lengthy and expensive process (typically 10-15 years and $1.7 billion). Better understanding of how and why a drug molecule binds to a target and what changes in the atomistic structure and chemistry could improve the binding affinity and shorten the process. In addition to structure-based approaches, the role of thermodynamics and molecular motions in binding selectivity and efficiency have attracted increasing attention. Whilst calorimetric methods can quantify total free energy and entropy change, it is difficult to estimate contributions from the diffe

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32

Yang, Yongqian. "Impact of Patchy Vegetation on Wave and Runup Dynamics." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/72278.

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Coastal regions are vulnerable to various natural processes, ranging from normal waves to extreme events. Given the flourishing development and large population along coastlines, various measures have been taken to mitigate the water-induced damage. Nature-based coastal protection, especially vegetation, has attracted unprecedented studies over the past two decades. To enhance understanding of this subject, this dissertation evaluates the impact of patchy vegetation on wave and runup dynamics along coastlines. Selecting from a prototype in Dalehite Cove, Galveston Bay, TX, results from a Bouss

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33

GATNE, KALPAK PRAKASH. "EXPERIMENTAL INVESTIGATION OF DROPLET IMPACT DYNAMICS ON SOLID SURFACES." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163531264.

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34

Lee, Gordon. "The theoretical and numerical analysis of impact oscillators." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336875.

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35

Zhu, Bin. "p-Version finite elements and applications in structural impact and damage detection /." access full-text access abstract and table of contents, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-bc-b19887565a.pdf.

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Thesis (Ph.D.)--City University of Hong Kong, 2005.<br>"Submitted to Department of Building and Construction in partial fulfillment of the requirements for the degree of Doctor of Philosophy" Includes bibliographical references (leaves 253-269)

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36

Maak, Travis Gardner. "Dynamic Intervertebral Foramen Narrowing During Whiplash." Yale University, 2006. http://ymtdl.med.yale.edu/theses/available/etd-06282006-113354/.

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A biomechanical study of intervertebral foraminal narrowing during simulated automotive head-forward and head-turned rear impacts. The objective of this study was to quantify foraminal width, height and area narrowing during head-forward and head-turned rear impacts, and evaluate the potential for nerve root and ganglion impingement. Muscle weakness and paresthesias, documented in whiplash patients, have been associated with neural compression within the cervical intervertebral foramen. Rotated head posture at the time of rear impact has been correlated with increased frequency and severity of

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37

Lee, Eunjeong. "Force and impact control for robot manipulators with unknown dynamics and disturbances." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1057933316.

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38

Djahansouzi, B. "Effect of dynamic response on impact damage." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47033.

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39

Saleh, Almahdi. "Assessment of Nonlinear Damping Elements for Vibro-Impacts inAutomotive Torsional Systems with Discontinuous Nonlinearities." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449148151.

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40

Šafr, Karel. "Analýza dopadů regulací pomocí dynamického input-output modelu." Master's thesis, Vysoká škola ekonomická v Praze, 2013. http://www.nusl.cz/ntk/nusl-194207.

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This diploma thesis discusses utilization of dynamic Input-Output models as a basis for decision-making for policy makers. The first part is focused on theoretical derivation of the basic dynamic models. This part is followed by a practical application of the presented models, which proposes a method of deriving the matrix of capital and it facilitates the construction of data sources. The results show that the dynamic models are usable, but it is necessary to take into consideration their structural constraints and data limits. Data applied for 2009 show that the economic crisis has led to a

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41

Rupčík, Jan. "Deformační člen formulového vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231790.

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The diploma thesis deals with Formula Student Impact Attenuator design of TU Brno Racing team. The aim of the thesis is the design, the dynamic tests and the production of Impact Attenuator of racing formulas called Dragon 4 and Dragon 5, so to meet the Formula Student rules. The thesis deals further with FEM dynamic analysis of Impact Attenuator.

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42

Kennedy, Eric Allen. "Lateral and Posterior Dynamic Bending of the Mid-Shaft Femur: Fracture Risk Curves for the Adult Population." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/32216.

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The purpose of this study was to develop injury risk functions for dynamic bending of the human femur in the lateral-to-medial and posterior-to-anterior loading directions. A total of 45 experiments were performed on human cadaver femurs using a dynamic three-point drop test setup. All 45 tests resulted in mid-shaft femur fractures with comminuted wedge and oblique fractures as the most common fracture patterns. The reaction loads were used to develop the injury criteria given that they represent the inertially compensated bending strength of the femur that is more appropriate for dummy load c

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43

DOMMATA, SANDEEP KUMAR GOUD, and SAMARA CHANDRA HASON KONAGALA. "IMPACT OF GROUP DYNAMICS ON TEAMS WORKING IN SOFTWARE ENGINEERING." Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4696.

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Context: Group dynamics play an important role in software projects. All of the existing software engineering methodologies (like Rational Unified Process, Microsoft Solutions Framework, Agile, etc.) use the concept of the teamwork and emphasize the necessity to manage them in order to organize the business processes in the best way. The application of group dynamic techniques is aimed at improvement of teamwork management to make it more efficient. The implementation of group dynamic techniques has an impact on teams working in software engineering and it also faces some challenges for indust

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44

Stoenescu, Eleonor D. Marghitu Dan B. "Dynamics and synthesis of kinematic chains with impact and clearance." Auburn, Ala., 2005. http://repo.lib.auburn.edu/EtdRoot/2005/SPRING/Mechanical_Engineering/Dissertation/STOENESCU_ELEONOR_32.pdf.

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45

Ward, Zoe. "Exploring the impact of heterogeneities on HIV dynamics within host." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.550615.

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This thesis is concerned with exploring how cell heterogeneity and drug resistance can cause long term persistence of HIV. We examine models of multiple viral strains to assess the impact of drug resistance on viral persistence and extend our cell heterogeneity models to include multiple strains. Chapter 1 summarises the nature of HIV infection within host. The key barriers to HIV eradication within host and the role of mathematical models to help understand these issues are discussed. In Chapter 2 we analyse models that include cell heterogeneity. We find robust long term viral persistence is

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46

Kundu, Reema. "Impact of engine icing on jet engine compressor flow dynamics." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54870.

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Core engine icing has been recognized to affect a wide variety of engines since the 1990's. This previously unrecognized form of icing occurs in flights through high altitude convective regions and vicinity of thunderstorms. Engine icing events involve power loss or damage associated to the engine core, namely instabilities such as compressor surge, stall, engine rollback and even combustor flameout events. The effects on compressor performance are significant in understanding the response of the engine to atmospheric ice ingestion. A one-dimensional axisymmetric flow model is used to simulate

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47

Warner, Sharon Elaine. "Foot design, locomotor impact dynamics and pathology in large mammals." Thesis, Royal Veterinary College (University of London), 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618328.

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48

Aoki, Takaaki. "Molecular Dynamics Simulation of Cluster Ion Impact on Solid Surface." Kyoto University, 2000. http://hdl.handle.net/2433/8942.

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学位授与年月日: 2000-03-23 ; 学位の種類: 新制・課程博士 ; 学位記番号: 1891<br>In this thesis, the impact process of cluster ions on solid surfaces was studied using molecular dynamics (MD) simulation. Cluster is an aggregated material which consists of a few to thousand atoms. The impact process of cluster ion on solid surface is of great interest because the effect of impact by cluster ion cannot be explained by the summation of individual monomer ions, and it is termed as 'nonlinear effect.' In order to understand the nonlinear effect by cluster, the dynamics of collisional process between cluster and solid surface

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49

Clapham, Hannah Eleanor. "Modelling dengue infection dynamics and the impact of control measures." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/18022.

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Dengue is a vector-borne disease found across much of the world, with an increasing number of cases annually. This thesis explores the dynamics of dengue infection within an individual, and the possible impact of this at a population level. I use mathematical modelling and statistical analysis, tightly coupled with data, as a way of tying together the important components and processes during infection. I model the virus and immune dynamics, capturing the differences between individuals, disease severity and primary/secondary disease (with a focus on hypothesised secondary mechanisms). Within

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50

Kaiser, Thomas. "Impact of Flow Rotation on Flame Dynamics and Hydrodynamic Stability." Thesis, Toulouse, INPT, 2019. http://oatao.univ-toulouse.fr/24115/1/Kaiser_Thomas.pdf.

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This thesis investigates large scale flow rotation in two configurations. In the first, the effect of flow rotation on a laminar flame is investigated. The flame is anchored in the wake of a cylindrical bluff body. The flow rotation is introduced by turning the cylinder along its axis. It is shown by Direct Numerical Simulation (DNS), that the cylinder rotation breaks the symmetry of both flame branches. Flame Transfer Function (FTF) measurements performed by the Wiener-Hopf Inversion suggest, that low rotation rates lead to deep gaps in the gain and the flame becomes almost insensitive to aco

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