Дисертації з теми "Force and moment"
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Becker, Felix [Verfasser], and Oliver [Akademischer Betreuer] Paul. "Miniaturized force/moment transducers for instrumented teeth." Freiburg : Universität, 2020. http://d-nb.info/1211956806/34.
Повний текст джерелаHsia, Wei-Kung 1958. "DOUBLE ANGLE CONNECTION MOMENTS (RICHARD EQUATION, PRYING FORCE, BEAM-LINE THEORY, MOMENT ROTATION CURVE)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291892.
Повний текст джерелаWhitfield, Cindy Carol. "Steady and Unsteady Force and Moment Data on a DARPA2 Submarine." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/34333.
Повний текст джерелаThe DARPA2 model was tested with different body configurations in two different test sections. The body configurations for both the steady and unsteady experiments were the bare body hull, body with sail, body with stern appendages, and body with sail and stern appendages. Tests were done using trips on the bow and sail and with no trips. The bare hull configuration with no trips was the only body configuration tested in the six-foot-square test section with solid walls. All body configurations were tested in the six-foot-square test section with slotted walls that were used to reduce the blockage effects produced by the DyPPiR and model.
The steady experiments were performed over a range of angles of attack and roll positions. Data were acquired through the series of angles the body encountered during the unsteady testing (-26° < ± <+26° ). The data for the tripped bare hull gave symmetric results while the data acquired for the bare hull with no trips did not. In the unsteady experiments the model was pitched in ramp maneuvers about the 1/4 chord location of the sail from 0° to -25° and from +25° to 0° in 0.3 seconds. Sine wave maneuvers at 3 Hz were also performed, plunging the model up and down with an amplitude of ±0.375 inches. The steady data agreed within uncertainties with previous data that were limited to the David Taylor Research Center (DTRC). There was a higher level of confidence in the steady data taken with trips due to the symmetry of the data. Effects of the sail and/or stern appendages were studied using the steady and unsteady data, but no quantitative value could be calculated due to the uncertainties. The unsteady data
were modeled with a quasi-steady time-lag model, and all the unsteady data were found to lead the quasi-steady data. The unsteady data did have oscillations, but the overall aerodynamic trend was still present. The uncertainties were too large to discuss effects of any appendages, however.
Master of Science
Johnson, Curtis Mathias. "A comparison of Reduced Beam Section moment connection and Kaiser Bolted Bracket® moment connections in steel Special Moment Frames." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/36233.
Повний текст джерелаDepartment of Architectural Engineering and Construction Science
Kimberly W. Kramer
Of seismic steel lateral force resisting systems in practice today, the Moment Frame has most diverse connection types. Special Moment frames resist lateral loads through energy dissipation of the inelastic deformation of the beam members. The 1994 Northridge earthquake proved that the standard for welded beam-column connections were not sufficient to prevent damage to the connection or failure of the connection. Through numerous studies, new methods and standards for Special Moment Frame connections are presented in the Seismic Design Manual 2nd Edition to promote energy dissipation away from the beam-column connection. A common type of SMF is the Reduce Beams Section (RBS). To encourage inelastic deformation away from the beam-column connection, the beam flange’s dimensions are reduced a distance away from the beam-column connection; making the member “weaker” at that specific location dictating where the plastic hinging will occur during a seismic event. The reduction is usually taken in a semi-circular pattern. Another type of SMF connection is the Kaiser Bolted Bracket® (KBB) which consists of brackets that stiffen the beam-column connection. KBB connections are similar to RBS connections as the stiffness is higher near the connection and lower away from the connection. Instead of reducing the beam’s sectional properties, KBB uses a bracket to stiffen the connection. The building used in this parametric study is a 4-story office building. This thesis reports the results of the parametric study by comparing two SMF connections: Reduced Beam Section and Kaiser Bolted Brackets. This parametric study includes results from three Seismic Design Categories; B, C, and D, and the use of two different foundation connections; fixed and pinned. The purpose of this parametric study is to compare member sizes, member forces, and story drift. The results of Seismic Design Category D are discussed in depth in this thesis, while the results of Seismic Design Category B and C are provided in the Appendices.
Nanou, Katerina. "Design of open cold rolled sections under axial force and bending moment." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324988.
Повний текст джерелаCastori, Giulia. "Interaction between axial force, shear and bending moment in reinforced concrete elements." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8519/.
Повний текст джерелаMetelues, Francis Gabriel. "The Knee Response during Squats with Heels Up and Down." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1388574269.
Повний текст джерелаHenry, Jason Matthew. "Theory and implementation of the naturally transitioning rate-to-force controller including force reflection using kinematically dissimilar master/slave devices." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175879099.
Повний текст джерелаLIMA, LUCIANO RODRIGUES ORNELAS DE. "BEHAVIOUR OF STRUCTURAL STEEL ENDPLATE JOINTS SUBJECTED TO BENDING MOMENT AND AXIAL FORCE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=4165@1.
Повний текст джерелаTradicionalmente, o projeto de pórticos em estruturas de aço assume que as ligações viga-coluna são rígidas ou flexíveis. As ligações rígidas, onde não ocorre nenhuma rotação entre os membros conectados, transferem não só momento fletor, mas também força cortante e força normal. Por outro lado, as ligações flexíveis são caracterizadas pela liberdade de rotação entre os membros conectados impedindo a transmissão de momento fletor. Desconsiderando- se estes fatos, sabe-se que a grande maioria das ligações não possuem este comportamento idealizado. De fato, a maioria das ligações transfere algum momento fletor com um nível de rotação associado. Estas ligações são chamadas semi-rígidas e seu dimensionamento deve ser executado de acordo com este comportamento estrutural real. Porém, algumas ligações viga-coluna estão sujeitas a uma combinação de momento fletor e esforço axial. O nível de esforço axial pode ser significativo, principalmente em ligações de pórticos metálicos com vigas inclinadas, em pórticos não-contraventados ou em pórticos com pavimentos incompletos. As normas atuais de dimensionamento de ligações estruturais em aço não consideram a presença de esforço axial (tração e/ou compressão) nas ligações. Uma limitação empírica de 5 por cento da resistência plástica da viga é a única condição imposta no Eurocode 3. O objetivo deste trabalho é descrever alguns resultados experimentais e numéricos para estender a filosofia do método das componentes para ligações com ações combinadas de momento fletor e esforço axial. Para se cumprir este objetivo, quinze ensaios foram realizados e um modelo mecânico é apresentado para ser usado na avaliação das propriedades da ligação: resistência à flexão, rigidez inicial e capacidade de rotação.
Traditionally, the steel portal frame design assumes that beam-to-column joints are rigid or pinned. Rigid joints, where no relative rotations occur between the connected members, transfer not only substantial bending moments, but also shear and axial forces. On the other extreme, pinned joints, are characterised by almost free rotation movement between the connected elements that prevents the transmission of bending moments. Despite these facts, it is largely recognised that the great majority of joints does not exhibit such idealised behaviour. In fact, many joints transfer some bending moments associated with rotations. These joints are called semi-rigid, and their design should be performed according to their real structural behaviour. However, some steel beam-to-column joints are often subjected to a combination of bending and axial forces. The level of axial forces in the joint may be significant, typical of pitched-roof portal frames, sway frames or frames with incomplete floors. Current standard for steel joints do not take into account the presence of axial forces (tension and/or compression) in the joints. A single empirical limitation of 5 percent of the beam s plastic axial capacity is the only enforced provision in Annex J of Eurocode 3. The objective of the present work is to describe some experimental and numerical results to extend the philosophy of the component method to deal with the combined action of bending and axial forces. To fulfil this objective a set of sixteen specimens were performed and a mechanical model was developed to be used in the evaluation of the joint properties: bending moment resistance, initial stiffness and rotation capacity.
Ramdasi, Surabhi Suhas. "Enhancement of a Rolling Resistance Rig for Force and Moment Testing of Tires." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71421.
Повний текст джерелаMaster of Science
Gupta, Manoj Kumar. "Bulk-Flow analysis for force and moment coefficients of a shrouded centrifugal compressor impeller." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2470.
Повний текст джерелаTucker, John R. "The design, manufacture and verification of a high capacity force and moment measurement system /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0010/MQ36189.pdf.
Повний текст джерелаArcano, Joseph Timothy Jr. "The force and moment on a submerged axisymmetric body moving near a sinusoidal wall." Thesis, Hurlburt Field, Fla. : JSOU Press, 1985. http://hdl.handle.net/10945/21345.
Повний текст джерелаKarol, Sohit. "Effect of kinetic degrees of freedom on multi-finger force and moment stabilizing synergies." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8606.
Повний текст джерелаThesis research directed by: Dept. of Kinesiology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Stagg, Gregory A. "An Aerodynamic Model for Use in the High Angle of Attack Regime." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/35596.
Повний текст джерелаMaster of Science
Dickof, Carla. "Clt infill panels in steel moment resisting frames as a hybrid seismic force resisting system." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44209.
Повний текст джерелаMartinez, Villalpando Ernesto Carlos. "Estimation of ground reaction force and zero moment point on a powered ankle-foot prosthesis." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37271.
Повний текст джерелаIncludes bibliographical references (leaves 89-97).
Commercially available ankle-foot prostheses are passive when in contact with the ground surface, and thus, their mechanical properties remain fixed across different terrains and walking speeds. The passive nature of these prostheses causes many problems for lower extremity amputees, such as a lack of adequate balance control during standing and walking. The ground reaction force (GRF) and the zero moment point (ZMP) are known to be basic parameters in bipedal balance control. This thesis focuses on the estimation of these parameters using two prostheses, a powered ankle-foot prototype and an instrumented, mechanically-passive prosthesis worn by a transtibial amputee. The main goal of this research is to determine the feasibility of estimating the GRF and ZMP primarily using sensory information from a force/torque transducer positioned proximal to the ankle joint. The location of this sensor is ideal because it allows the use of a compliant artificial foot to be in contact with the ground, in contrast to rigid foot structures employed by walking robots. Both, the active and passive, instrumented prostheses were monitored with a wearable computing system designed to serve as a portable control unit for the active prototype and as an ambulatory gait analysis tool.
(cont.) A set of experiments were conducted at MIT's gait laboratory whereby a below-knee amputee subject, using the prosthetic devices, was asked to perform single-leg standing tests and slow-walking trials. For each experiment, the GRF and ZMP were computed by combining the kinetic and kinematic information recorded from a force platform and a 3D motion capture system. These values were statistically compared to the GRF and ZMP estimated from the data collected by the embedded prosthetic sensory system and portable computing unit. The average RMS error and correlation factor were calculated for all experimental sessions. Using a static analysis procedure, the estimation of the vertical component of GRF had an averaged correlation coefficient higher than 0.96. The estimated ZMP location had a distance error of less than 1 cm, equal to 4% of the anterior-posterior foot length or 12% of the mediolateral foot width. These results suggest that it is possible to estimate the GRF between the ground and a compliant artificial prosthesis with a sensor positioned between the knee and the ankle joint.
(cont.) Moreover, this sensory information is sufficient to closely estimate the ZMP location during the single support phase of slow walking and while standing on one leg. This research contributes to the development of fully integrated artificial extremities that mimic the behavior of the human ankle-foot complex, especially to help improve the postural stability of lower extremity amputees.
by Ernesto Carlos Martinez Villalpando.
S.M.
Ibrahim, Azmi. "Behaviour of unstiffened and bolt-stiffened RHS beams under combined bending moment and concentrated force." Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240405.
Повний текст джерелаSnell, Lloyd Dale. "Force and moment analysis of stacked counter rotating eccentric mass tree shaker energy-wheel system." [Ames, Iowa : Iowa State University], 2008.
Знайти повний текст джерелаDavis, Matthew Harris. "A Bond Valence-Based Force Field: A Multi-Body Approach." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3796.
Повний текст джерелаWearing, Christopher. "Evaluation of force distribution within a dual special moment-resisting and special concentric-brace frame system." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/35483.
Повний текст джерелаDepartment of Architectural Engineering and Construction Science
Kimberly W. Kramer
Dual Lateral Force Resisting Systems are currently required by code to include a Moment Resisting Frame capable of resisting at least 25% of the lateral loads. This thesis evaluates the seismic performance of a specific type of dual system: a Special Moment Resisting Frame-Special Concentric Brace Frame System (SMRF-SCBF) under three different force distributions. The three distributions were 80% - 20%, 75% - 25%, and 70% - 30% with the lesser force being allotted to the Special Moment Resisting Frame (SMRF) portion of the system. In order to evaluate the system, a parametric study was performed. The parametric study consisted of three SMRF-SCBF systems designed with different seismic force distributions. The aim of this study was to determine accuracy of the three different seismic force distributions. The accuracy was measured by comparing individual system models’ data and combined system models’ data. The data used for comparison included joint deflections (both horizontal and vertical), induced moments at moment connections, brace axial loads, column shears, and column base reactions. Two-dimensional models using the structural software RISA 3D were used to assist in designing the independent Seismic Force Resisting Systems. The designs of the frames were not finely tuned (smallest member size for strength), but were designed for drift (horizontal deflection) requirements and constructability issues. Connection designs were outside the scope of the study, except for constructability considerations – the SMRF and the SCBF did not have a common column; the frames were a bay apart connected with a link beam. The results indicated that a seismic force distribution of 75% to the SCBF and 25% to the SMRF most accurately predicts that frame’s behavior. A force distribution of 80% to the SCBF and 20% to the SMRF resulted in moderately accurate results as well. A vast opportunity for further research into this area of study exists. Alterations to the design process, consideration of wind loads, or additional force distributions are all recommended changes for further research into this topic.
Kaye, Tari Eileen Carleton University Dissertation Engineering Mechanical and Aerospace. "Techniques for aircraft force and moment model development using geometry and stability and control derivative estimates." Ottawa, 1994.
Знайти повний текст джерелаSherban, V. Yu. "Software components of the system for the kinematic and dynamic analysis of machines for sewing, textile and shoe industries." Thesis, Київський національний університет технологій та дизайну, 2017. https://er.knutd.edu.ua/handle/123456789/6655.
Повний текст джерелаYoon, Hyunse Stern Frederick Longo Joseph. "Phase-averaged stereo-PIV flow field and force/moment/motion measurements for surface combatant in PMM maneuvers." [Iowa City, Iowa] : University of Iowa, 2009. http://ir.uiowa.edu/etd/453.
Повний текст джерелаYoon, Hyunse. "Phase-averaged stereo-PIV flow field and force/moment/motion measurements for surface combatant in PMM maneuvers." Diss., University of Iowa, 2009. https://ir.uiowa.edu/etd/453.
Повний текст джерелаCauthen, Rea Kimbrell III. "Design and Qualification of a Test Fixture to Experimentally Determine Global Tire Force Properties." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/46872.
Повний текст джерелаMaster of Science
Standifird, Tyler W. "Lower Extremity Joint Moments During the Active Peak Vertical Ground Reaction Force in Three Different Running Conditions." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/2982.
Повний текст джерелаCampbell, Brian Jude Weimar Wendi Hannah. "Wrist extension counter-moment force effects on muscle activity of the ECR with gripping implications for lateral epicondylagia /." Auburn, Ala., 2006. http://repo.lib.auburn.edu/Send%206-15-07/CAMPBELL_BRIAN_6.pdf.
Повний текст джерелаLavoie, Mathieu. "La relation critique de T.W. Adorno à S.A. Kierkegaard : la force du sujet au moment de sa chute." Master's thesis, Université Laval, 2005. http://hdl.handle.net/20.500.11794/43698.
Повний текст джерелаMills, Matthew. "A multipolar polarisable force field method from quantum chemical topology and machine learning." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/a-multipolar-polarisable-force-field-method-from-quantum-chemical-topology-and-machine-learning(3fb1e55c-0d4c-4d11-932b-71706bdbeb8b).html.
Повний текст джерелаBuell, Grant. "Comparison of structural steel lateral force resisting systems for a theoretical hospital grid system." Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/2321.
Повний текст джерелаNoorkoiv, Marika. "Neuromuscular adaptations of joint angle-specific force change after isometric training." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2013. https://ro.ecu.edu.au/theses/531.
Повний текст джерелаTrahan, Jacques. "Modélisation du moment de force à partir de l'activité électromyographique, de l'angle et de la vitesse angulaire du segment." Thèse, Université du Québec à Trois-Rivières, 1991. http://depot-e.uqtr.ca/5480/1/000587549.pdf.
Повний текст джерелаSnow, Scott Karl. "Numerical Analysis of Passive Force on Skewed BridgeAbutments with Reinforced Concrete Wingwalls." BYU ScholarsArchive, 2008. https://scholarsarchive.byu.edu/etd/7399.
Повний текст джерелаWaugh, Charlotte. "The effects of age- and training-related changes in tendon stiffness on muscular force production and neuro-motor control during childhood." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/6596.
Повний текст джерелаSimoneau, Emilie. "Effets du vieillissement et de l'entrainement en force sur la production de moment en flexion plantaire et en dorsi-flexion." Dijon, 2006. http://www.theses.fr/2006DIJOS041.
Повний текст джерелаThe primary goal of this manuscript is to investigate the effects of aging and also of strength-training on agonist and antagonist muscles responsible for the torque generation at the ankle joint, in plantar-flexion (PF) and dorsi-flexion (DF). The main findings show that i) the age-related decline in the maximal torque seems to be of an earlier onset in PF than in DF; ii) the maximal torque-angle relationship appears to be especially explained by neural parameters in DF and by muscular parameters in PF; iii) for any assessment, measurements at one ankle joint angle are enough; iv) a long-term strength-training program of the PF muscles in old age is very effective in increasing strength in PF, with late muscular adaptations; v) the isometric maximal performance of the agonist muscles in DF and PF is, in fine, similarly affected with aging
Toledo, Joelly Manhic de. "Determinação do momento proximal resultante e da força proximal resultante no ombro em exercícios de reabilitação com três diferentes situações de carga." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/15290.
Повний текст джерелаThe objective of this study was to determine the proximal net moment (PNM) and proximal net force (PNF) peaks of the shoulder in some shoulder rehabilitation exercises (elevation, flexion and abduction) with three different load situations: without load (WL), with free load (FL) and with elastic resistance (ER). Twenty-one male subjects, right-handed and without right shoulder injury history participated in the study. For kinematics analysis, five digital cameras connected to five computers were used and, for kinetic analysis for the ER load situation, a strain gauge was used. Each subject carried out five repetitions of all movements with the three load situations in a randomized order and, therefore, participated of nine situations of analysis. A three-dimensional mathematic model was used to calculate the PNM and PNF and the axes used are: posterior-anterior (x), inferior-superior (y) and medio-lateral (z). In the data statistic analysis, data normality was confirmed by Shapiro-Wilk test. The data of PNM peak, PNF peak and angle which these peaks occur in the three different situation loads and in the three different movements were compared using a two-way repeated measures analysis of variance (ANOVA) with Bonferroni post hoc test (significance level of 0,05). The results show that in the x and z axes there is significant statistical difference for all variables analised in the two factors. However, in the y axis the angle where the peak PNF occur does not reveals statiscal difference in the movement factor. With regard to factors interaction, there are just two significants for PNF peak angle in the x axis and for PNF peak in the y axis. In conclusion, the exercises that have the greater PNF peak in the x and y axes were elevation and flexion, and in the z axis was abduction. The exercises that have the greater PNM peak in the x and y axes was abduction and in the z axis were flexion and elevation. The load situations that presented the greater PNF peak in the x axis were FL and ER and in the y and z axes was FL. The situation load that has the greater PNM peak in all axes was FL.
Tort, Marine. "Dynamique et modélisation des atmosphères profondes." Palaiseau, Ecole polytechnique, 2015. https://pastel.archives-ouvertes.fr/tel-01137840.
Повний текст джерелаLarge-scale atmospheric and oceanic motions are fairly well described under the so-called shallow-atmosphere approximation, which neglects the thickness of the atmosphere comparing to the planetary radius. Titan is the biggest moon of Saturn and has a thick atmosphere with an aspect ratio reaching almost 25%. It is then preferable not to make the shallow-atmosphere approximation to model its atmospheric general circulation. This thesis solves problems in modeling of such deep-atmospheres and addresses some issues for understanding their dynamics. The shallow-atmosphere and traditional approximation neglecting the part of the Coriolis force due to the horizontal component of the planetary rotation rate vector (also called as non-traditional part) seem to be inseparable to satisfy the conservation of absolute angular momentum. However, we show that it is possible to retain non-traditional terms under the shallow-atmosphere approximation while satisfying all conservation laws, in the compressible Euler equations as well as in the shallow-water equations on the rotating sphere. In most cases, given the small aspect ratio, this new non-traditional model is accurate. In this case, several idealized zonal jet stability and free evolving turbulence studies have been conducted using shallow-water and Boussinesq models taking into account the complete Coriolis force. We highlight the parameters for which the non-traditional effects are significant and discuss the dynamical effects in realistic cases. To model general circulation of Titan's atmosphere, we integrate the quasi-hydrostatic equations in the dynamical core of the LMD-Z (Titan) atmospheric general circulation model. After identifying the Hamiltonian structure of the equations, we imitate the formulation at discrete level to conserve total energy. Various test cases are performed in order to validate the stability and the accuracy of the new dynamical core. The latter is applied to Titan's atmosphere. Firstly, an idealized simulation is performed starting from an atmosphere at rest and using a Newtonian relaxation. Then more realistic simulations are implemented using parameterizations of LMD-Z (Titan)
Miller, Stuart Charles. "Mechanical factors affecting the estimation of tibialis anterior force using an EMG-driven modelling approach." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/8763.
Повний текст джерелаMarié, Louis. "Transport de moment cinétique et de champ magnétique par un écoulement tourbillonnaire turbulent : influence de la rotation." Phd thesis, Université Paris-Diderot - Paris VII, 2003. http://tel.archives-ouvertes.fr/tel-00007755.
Повний текст джерелаKašparů, Jakub. "Statické řešení betonového komínu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226418.
Повний текст джерелаTamborindeguy, Aline Cavalheiro. "Avaliação da força e do momento tibiofemoral durante a pedalada : uma orientação para a reabilitação." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17609.
Повний текст джерелаTAMBORINDEGUY, A. C. Assessment of force and moment during cycling: an orientation to rehabilitation. Master thesis. Graduation Program in Human Movement Sciences. School of Physical Education. Federal University of Rio Grande do Sul. During knee injuries rehabilitation process the cycle ergometer has been largely used. However, there are few studies orienting their use avoiding overload damaged structures. The aim of the present study was to compare the effects of compression and shear force components and resultant joint moment in ergometer cycling at different saddle height, cadence and workload during rehabilitation seasons. Nine healthy male volunteers participated in this study. Protocol consisted of evaluation of three differents saddle heights (trochanter height, 3 cm downward and 3 cm upward from trochanter height), two cadences (40 and 70 rpm) and three workloads (0, 5 and 10 N). An instrumented pedal and a motion system were used to calculate the twodimensional biomechanical model. Mean peak compressive intersegmental force, maximum and minimum mean peak shear force, and mean peak extensor and flexor moment during eight pedaling cycles were analyzed. Results demonstrated that changes in workload interfere in mean peak compressive force as well in maximum mean peak shear intersegmentar force. Mean peak compressive were -44.94 (±3.12) N for 0 N, -53.21 (±4.56) N for 5 N and -76.50 (±5.69) N for 10 N. Maximum mean peak shear were 61.32 (±5.60) N for O N, 71.21 (±7.73) N for 5 N and 93.89 (±9.10) N for 10 N. Mean peak flexor moment increased as workload increase (12.77 (±1.68) Nm for 0 N, 16.90 (±2.49) Nm for 5 N and 25.40 (±3.25) Nm for 10 N). Mean peak extensor moment increased at saddle positioned 3 cm downward. Results were - 10.15 (±0.58) Nm, -11.09 (±0.55) Nm, and -9.68 (±0.58) Nm, for trochanteric height, 3 cm downward, and 3 cm upward, respectively. Mean peak extensor moment increased as cadence and workload increased (from -10.12 (±0.57) Nm at 40 rpm to - 10.49 (±0.56) Nm at 70 rpm; from -10.19 (±0.57) Nm at 5 N to -10.53 (±0.60) Nm at 10 N, respectively). Therefore, pedaling at 0 N with saddle positioned 3 cm upward from trochanter height at 40 rpm results in lower joint and muscle overload.
Grøtner, Katrine, and Huy Hoang Pham. "Kinetik ved løb med dagligdagsprotese og løbespecifikprotese hos transtibial amputerede: Et cross-sectional studie." Thesis, Hälsohögskolan, Jönköping University, HHJ, Avd. för rehabilitering, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-49495.
Повний текст джерелаAim: The aim of this study was to investigate how running with a daily-use prosthesis and a running specific prosthesis affects kinetics in the lower extremities when it comes to people with a transtibial amputation. Method: Kinetic data was collected through running tests, using both type of prosthesis, with a motion capture system and force plates in a clinical gait lab in Gothenburg, Sweden. Participants (n=2) executed the running tests in a self-selected speed, while wearing reflective markers. Vertical ground reaction force, foot progression angle, hip- and knee moment were selected for data processing. Results: Differences in hip- and knee adduction moment and foot progression angle were observed between the two types of prostheses. Moments were smaller when participants ran with running-specific prosthesis. Dissimilarity for the amputated side and the contralateral side were noted for all parameters regardless of type of prosthesis. The contralateral side had increased values compared to the amputated side. Conclusion: Because of the sample size we cannot conclude that individuals with a unilateral lower body amputation absorb load more efficiently when running with a running-specific prosthesis rather than a daily-use prosthesis.
Jovanovic, Dejan, and Ruslan Khalilov. "Transverse force absorption in column base mounts for steel columns : Screw joints in column bases." Thesis, KTH, Byggteknik och design, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302520.
Повний текст джерелаDet är vanligt förekommande att man använder sig av olika konstruktionsmaterial i kombination med varandra såsom betong, stål, trä och glas för att på så sätt kunna optimera byggnader. Syftet med detta är att minska vikt och öka belastningskapacitet, men det underlättar även montaget och minskar byggtiden. Pelarfötter av stål förankrade i betongfundament är ett exempel på en kombination av samverkansknutpunkter mellan stål och betongelement. I denna rapport studeras friktionen mellan underkant fotplatta och undergjutning, som är en funktion av pelarens normalkraft. Även friktionen som uppstår mellan fyrkantsbrickan och fotplattan kommer att undersökas som ett resultat av åtdragningsmomentet. Arbetet har lagt stor fokus på att diskutera för- och nackdelar med de olika metoderna för tvärkraftsupptagning i pelarfötter. Avgränsningar har gjorts, pelarens infästning till fotplåten har inte beaktats i denna rapport, eftersom detta är beroende av vilket pelartvärsnitt som är valt och måste kontrolleras för det specifika fallet. För att komma fram till resultaten utfördes en fördjupad litteraturstudie för att samla ihop information om de olika frågeställningarna och en beräkningsmodell i Excel skapades. Beräkningsmodellen användes för att kontrollera hur stor den dimensionerande bärförmågan är för tvärkraftsupptagning i en pelarfot, men kontrollerna görs endast för icke förspända förband. Detta eftersom förspända förband även har andra faktorer som påverkar tvärkraftskapaciteten, utanför arbetets syfte och frågeställning. Excel-modellen går ut på att ta fram resultaten ur beräkning med nominell spännkraft och jämföra den med spännkraft beräknad med åtdragningsmoment. Resultaten redovisas i form av grafer och tabeller, där man kan läsa av skillnaden i den dimensionerande bärförmågan för tvärkraftupptagning i icke förspända förband vid nominell spännkraft och spännkraft beräknad med åtdragningsmoment. Rapporten visar en tydlig skillnad i resultat, där den nominella spännkraften blev betydligt större och detta stöds av handbok om skruvförband, då det nämns att “det är inte möjligt att ge ett exakt värde på friktionskoefficienten på grund av det stora antalet faktorer som påverkar”, detta medför att inverkan på klämkraften blir stor.
Smith, Kyle Mark. "Passive Force on Skewed Bridge Abutments with Reinforced Concrete Wingwalls Based on Large-Scale Tests." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5577.
Повний текст джерелаHorký, Karel. "Návrh setrvačníku jednovzpěrného čelisťového drtiče." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400467.
Повний текст джерелаEmilia, Wallin. "Jämförelse av beräkningsmetoder för lastspridning i tvärled vid brobaneplattor av betong." Thesis, KTH, Betongbyggnad, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169916.
Повний текст джерелаThe aim of this thesis is to study different design methods for determing load distribution, and design values for shear force and bending moment in concrete bridge decks. The study was performed based on three design methods for hand calculations, which have been compared to the results from finite element modelling (FEM). The load distribution has a major impact on the design of a bridge and how the results from different design methods will correlate is of a great interest. The evaluation has been performed on one case study, wich is an eight-meter wide composite girder bridge in Njurunda, situated south of Sundsvall in Sweden. The traffic loads applied for this study was load model 1 and load model 2 prescribed in Eurocode (CEN, 2003). One of the design methods investigated is a method used to determine for bending moment for a cantilever slab. A significant impact from the edge beam utilizes by the method to calculate the bending moment. The second method is a design method for shear forces recommended by The Swedish Transport Administration. The third and last design methods for hand calculation is to use influence charts by Pucher (Pucher, 1977). By using the influence chart to calculate the maximum bending moment in mid-span. Results from different models, created with FEM, were compared to the results from hand calculations. The bridge slab was modelled with shell elements, and the girders of the bridge were modelled in four different ways to study the impact of the level of detail in the numerical models. The results in this report show that hand calculation methods are based on significant simplifications of the structure and these may have a major impact on the results. The relation between results from hand calculation methods and results obtained with FEM was not consistent in all cases analysed. While studying the bending moment for a cantilever slab, the main conclusion was that the simplifications in the hand calculation methods resulted in significantly higher moments compared to the FE-calculations. Regarding design for shear forces, the FE analyses resulted in nearly twice as high shear forces compared to the hand calculation methods. While using the influence charts by Pucher the relation between results from hand calculations and results from FEM was not consistent. Conclusions from the study included that the simplifications in hand calculations is hard to change. These simplifications can have a major influence to the results. Some simplifications will make the results more on the safe side. With FEM the user is more free to choose which simplifications that will be made, but it can sometimes be hard to see the effect simplifications have on the results. Concrete is a complex material and design methods based on empirical studies does most likely give a result that reflects the reality better than methods based on mathematic theories.
Lidmila, Ladislav. "Rekonstrukce mostu v Ledči nad Sázavou." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409797.
Повний текст джерелаMartin, Ramaldo S. "Implementation and validation of a computational model of the feline forelimb." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50293.
Повний текст джерелаLemaire, Alexandra. "Lombalgies chroniques : évaluation des facteurs mécaniques des membres inférieurs au moyen des relations moment-vitesse." Thesis, Le Mans, 2014. http://www.theses.fr/2014LEMA1024/document.
Повний текст джерелаLow back pain is a public health problem inducing economical and social consequences. Chronicity involves less than 10% of low back pain, but represents 85% of the total costs related to this pathology. In this context, it seems essential to optimize chronic low back pain rehabilitation programs to make them more effective and relevant. The purpose of this phD was then to evaluate lower limbs mechanical factors using torque- and power-velocity relationships. In a first study, knee extensors muscles and trunk flexor and extensor muscles were evaluated in chronic low back pain and healthy subjects. A significant knee extensor strength and power weakness weas observed for chronic low back pain subjects, associated with the typical trunk weakness referred to this population. The second study focused on establishing a protocol allowing assessing hip flexor and extensor torque- and power-velocity relationships. This protocol was then applied to evaluate flexor and extensor hip muscles in chronic low back pain subjects. Results, in accordance with the first study, highlighted a significant strength and power weakness for hip muscle groups in chronic low back pain relative to healthy subjects, with a greater hip extensor deficit, as it is generally observed for the trunk.In conclusion, these different studies showed the importance of proposing torque and power lower limbs rehabilitation for chronic low back pain patients to better fight against the deconditioning syndrome that affects all muscular chains in this population