Дисертації з теми "Moment of frictional forces"
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Gan, Aik Ben. "The effect of frictional and thermal forces upon sea bed pipeline buckling behaviour." Thesis, Sheffield Hallam University, 1985. http://shura.shu.ac.uk/19217/.
Повний текст джерелаWood, Peter Edwin. "An investigation of contact forces, flow, pressure, hysteresis and frictional effects in brush seals." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393118.
Повний текст джерелаРазаві, Сейед Фаршад. "Гідродинамічні особливості потока аномально-в'язких рідин у конічної поверхні ковзання". Doctoral thesis, Київ, 2019. https://ela.kpi.ua/handle/123456789/29180.
Повний текст джерелаChristman, Benjamin M. "Evaluation of frictional forces between brackets of different types at various angulations and an arch wire: With and without pulsating vibration." Thesis, NSUWorks, 2015. https://nsuworks.nova.edu/hpd_cdm_stuetd/61.
Повний текст джерелаLim, keng gein. "P-delta Effects on a Steel Moment Frame Subjected to Sidesway Forces Caused by Unsymmetrical Live Load Patterns." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1622.
Повний текст джерелаKoukal, Milan. "Mechanická analýza vlivu výrobních odchylek na styk hlavice a jamky totální endoprotézy kyčelního kloubu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233902.
Повний текст джерелаPashak, Riley. "Susceptibility to Ankle Sprain Injury between Dominant and Non-Dominant Leg During Jump Landings." UKnowledge, 2019. https://uknowledge.uky.edu/khp_etds/66.
Повний текст джерелаRoy, Adam. "Music in Motion: A Metaphoric Mapping of Forces in Piano Concertos by Mozart and Schumann." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33009.
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 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 джерелаWhite, Joshua Childs. "Development and validity assessment of the Max Power Model for the detection, separation, and quantification of differences in resistive and propulsive forces in swimming." [Bloomington, Ind.] : Indiana University, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219898.
Повний текст джерела"Title from dissertation home page (viewed June 28, 2007)." Source: Dissertation Abstracts International, Volume: 67-06, Section: B, page: 3092. Adviser: Joel M. Stager.
McCarty, Colin Michael. "Behavior of Two-Span Continuous Reinforced Concrete Beams." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1219333577.
Повний текст джерелаBègue, Jérémie. "Étude des modifications du contrôle du moment cinétique chez la personne âgée lors de l'exécution du pas." Thesis, La Réunion, 2020. http://www.theses.fr/2020LARE0038.
Повний текст джерелаIn order to understand the etiology of falls in the elderly, studies in the field of biomechanics have mainly focused on assessing balance abilities, relying on the analysis of linear body movements. However, maintaining balance during our various motor tasks requires both appropriate control of linear movements and angular (rotational) movements of body segments. Thus, this doctoral work aims to identify and understand changes in the control of angular body movements in old adults through the study of whole-body angular momentum, which is recognized as a mechanical parameter highly controlled by the central nervous system to maintain balance. Our studies reveal that during the volitional stepping task, old adults exhibit an alteration in the control of the whole-body angular momentum. Overall, our results show that old adults have a higher range of whole-body angular momentum than their younger counterparts – particularly in the sagittal plane – and this is exacerbated with the increase in progression velocity. Furthermore, our results highlight that this age-related changes in the control of whole-body angular momentum is directly ascribed to changes in segmental angular momenta, with old adults having higher trunk and lower limb angular momenta than young adults. Finally, we observed a relationship between the range of whole-body angular momentum during the stepping task and measurements of muscle strength and balance in young and old adults. These results suggest that age-related changes in the control of whole-body angular momentum, which may impose greater challenge for balance control and potentially a greater risk of fallingduring the volitional stepping task in old adults, can be partially attributed to the decline in lower limb muscle strength and the impairment of other systems involved in balance control with aging. Together, our results contribute to a better understanding of the mechanisms underlying impaired balance control in old adults and provide a basis for future studies to reduce the incidence of falls in this population
Freitas, Ana Carolina Carneiro de. "Forças, momentos e coeficiente de atrito em teste de três pontos e em teste de resistência ao deslizamento com braquetes autoligáveis e fios 0.014\" utilizando um novo dispositivo." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/23/23140/tde-24052016-154250/.
Повний текст джерелаThe main objective of the study is to compare the three-bracket bending test with the resistance to sliding test using a new device that performs simultaneous measurement of coefficient of friction, the forces and moments on the anchor brackets and deactivation force in misaligned bracket, exercised by orthodontic wires. Secondary objectives were to develop the device and compare, in the three-bracket bending test: (i) the influence, on the physical quantities and on the kinetic friction coefficient, of the variation of the symmetry in the inter-bracket distance, of the type of anchor bracket (canine or 2nd premolar), of displacement (3 or 5mm) and misalignment (buccal or lingual) of the central bracket, and of the wire and bracket brand; (ii) the three ways to calculate the coefficient of kinetic friction; (iii) the 10 cycles, for buccal or lingual, to see if they are similar or not. Self-ligating brackets were used (teeth 13, 14 and 15) and wires 0.014 \'\' NiTi and CuNiTi of Aditek and Ormco brands. The resistance to sliding test was conducted on the lingual misalignment, on both displacements and on symmetrical configuration. The three-bracket bending test was held at the lingual and vestibular misalignment, at both displacements and at the symmetrical and asymmetrical configuration. Through ANOVA, were compared, between the two types of tests: (A) the quantities and the coefficient of friction and (B) the coefficient of friction generated only in the second premolar bracket. Using the same statistical test were compared, in three-bracket bending test: (A) in symmetrical configuration, the quantities and the coefficient of friction arising from the variation in the wire and bracket brands, displacement, misalignment and the type of bracket; (B) the quantities and the coefficient of friction generated by the symmetric and asymmetric configuration; (C) the values of the three ways of calculating friction coefficient; and (D) the quantities and the coefficient of friction encountered in 10 cycles. Results: (A) most of the values of the quantities and the coefficient of friction generated by the two types of test were statistically different; (B) the 2nd premolar bracket showed different friction coefficient values between the two types of test; (C) in the symmetrical configuration, the variables were statistically significant in the most of cases for quantities and the friction coefficient; (D) was found difference between symmetric and asymmetric configuration; (E) the friction coefficient based on both normal forces and frictional force was closer to the clinical reality and was sensitive to variations in the geometry of the wire-bracket relationship; and (F) the 10 cycles for lingual were similar in 70% of cases and the 10 cycles for buccal desalignment were different in 57% of cases. Conclusions: The three-bracket bending test is different from the resistance to sliding test; the variation of geometric configurations and wire and bracket brands may influence the values of the quantities and the coefficient of kinetic friction; the 10 cycles for lingual were more similar to each other than the 10 cycles for buccal.
Rossitto, Emanuela. "Synthèse chimique et assemblage sous champ électrique de nanocristaux semiconducteurs anisotropes." Phd thesis, Université Joseph Fourier (Grenoble), 2009. http://tel.archives-ouvertes.fr/tel-00485996.
Повний текст джерелаKošík, Ondřej. "Železobetonová prefabrikovaná nosná konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409795.
Повний текст джерелаAurand, Alexander M. "Dynamic Moments on the Cervical Spine Imposed by Head-Mounted Equipment." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1430747355.
Повний текст джерелаSlanina, Bohumil. "Rámová konstrukce atypického půdorysu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240204.
Повний текст джерелаKaspryzk, Marie. "Strategically minded dynamic analysis of strategic flight bat maneuvers." Honors in the Major Thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/864.
Повний текст джерелаB.S.M.E.
Bachelors
Mechanical, Material and Aerospace Engineering
Engineering and Computer Science
Wallin, Harald. "An investigation of friction graphs ranking ability regarding the galling phenomenon in dry SOFS contact : (Adhesive material transfere and friction)." Thesis, Karlstad University, Faculty of Technology and Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-2790.
Повний текст джерелаThe main purpose of this project is to investigate different tool steels in terms of their ability to withstand material transfer buildup, so-called galling, occurring in SMF (sheet metal forming) operations. The ability to withstand galling is vital to optimize cost-effectiveness and increase the work tool’s effective operational time. This investigation studies four different tool steels, including a TiN-coating, with the intention of evaluating the microstructures, chemical composition and hardness effect on galling resistance in dry conditions using a slider-on-flatsurface (SOFS) tribo-tester which measures the coefficient of friction during sliding.
An OP (optical profilometer) was used to measure the size and geometry of lump growth on the tool and damage on the work sheet. A scanning electron microscope (SEM) was used to identify the interacting tribological mechanisms exhibited at different stages during the slide. The SEM figures confirmed three different types of characteristic patterns exhibited in the tracks after tribo- testing which were categorized as mild adhesive, abrasive and severe adhesive damage.
A SEM figure that illustrates a ragged contact surface and an obvious change in the sheet materials plastic behavior is in this report regarded as a sign of severe adhesive contact, the characteristics could possibly be explained by local high temperature and high pressure followed by a sudden pressure drop and creation of hardened welds or solders between the two surfaces which increase the frictional input needed for further advancement. Friction coefficients observed in the initial 100% mild adhesive stage were, μ=0,22-0,26 succeeded by abrasive SEM characteristics often in association with mild adhesive contact and friction values between μ=0,25-0,4 which where sometimes followed by severe adhesive SEM characteristics in 100% of the contact zone with friction values between μ=0,34- 0,9 respectively. The tool material that performed best according to the friction detection criteria was Sv21 closely followed by Sleipner (TiN coated) and Va40 (HRC 63.3). Unfortunately was the friction criteria, a significant raise in friction for defining a sliding length to galling, not adequate for dry conditions due to immediate material transfer succeeded by cyclic changes between partial or 100% abrasive+mild adhesive and severe adhesive contact. The mechanism that change abrasive wear in association with mild adhesive contact, (moderate friction input), to sever adhesive wear, (higher friction input), is dependent on lump shape (lump geometry) and can appear at comparably low speeds 0,04-0,08 [m/s] and low friction energy input (μ=0,34), the magnitude of the change in friction is therefore not always significant and hardly detectable on the friction graph. This was quite unexpected but could be explained by concentration of friction energy rater than the absolute amount. The problem with using friction graphs for galling evaluation was increased even further when a very small lump size and low corresponding rate of material transfer to the tool surface caused a sustainable high raise in friction (μ≈0,3→0,6) on a TiN-coated tool steel called Sleipner.
A hardly detectable or similar friction raise for Sv21 and Va40 showed much larger corresponding lump size and rate of material transfer. This means that friction graphs demonstrate a clear problem with quantifying lump size [m3] and rate of material transfer [m3/s]. Another phenomenon called stick slip behavior, material transfer and lump growth followed by a sudden decrease in lump size and transfer of material back to the work sheet, is also not possible to detect on a friction graph. Because a drop in friction can easily be a change in contact temperature and lump attack angle due to a growing lump and not a decreasing lump.
The conclusion, a friction graph is not suited for galling evaluation and ranking in dry SOFS conditions. A ranking should primarily be based on dimensional OP measurements of the cross section of formed tracks and scratches or preferably by repeated OP measurements of the tool surface during a single test, the last revel the exact lump growth history and true lump growth even in the sliding direction.
civilingenjörsexamen
Urban, Marek. "Návrh zavěšení kol Formule Student." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417557.
Повний текст джерелаSitta, Martin. "Montovaná železobetonová konstrukce výrobní haly s administrativou." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265275.
Повний текст джерелаWu, Li-Chun, and 吳麗君. "Evaluation on frictional forces between different sets of orthodontic brackets and archwires." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/65124185395127737287.
Повний текст джерела中國醫藥大學
臨床醫學研究所碩士班
97
Sliding a tooth along an archwire is a very common orthodontic procedure, especially during closure of spaces in the extraction case. A frictional force generated at bracket/archwire interface tends to resist the desired movement, thus reduce the efficiency of orthodontic treatment. Therefore, understanding the frictional force between brackets and archwires is one of the important issues. The objectives of this in vitro study were to evaluate the frictional mechanism between different sets of the orthodontic brackets and archwires during sliding, and surface characteristics of the archwires including hardness, surface topography and surface roughness. Three types of preadjusted maxillary canine brackets were selected in this study: metal brackets, plastic brackets with metal slot, and self-ligating brackets. Four types of archwires were also used: stainless steel wires, Sentalloy nickel-titanium (Ni-Ti) alloy wires, low-stress hysteresis (LH) wires, and Beta-titanium wires (TMA). The experiment were divided into two parts: (1) frictional force testing: each bracket-archwire combination was subjected to 10 independent evaluations, giving a total of 120 trials in this study. Testing was performed on a material testing machine with a 10-N load cell. The static frictional friction, peak point of friction, was used as the evaluation index. (2) measurement of the surface characteristics of archwires: surface hardness, surface roughness, and surface topography obtained from metallographic microscope and scanning electron microscope (SEM). The results of the study showed that the significant differences were observed in the frictional forces among the different combinations of brackets and archwires. Basically, Self-ligating brackets showed the lowest frictional forces in all type of archwires. Furthermore, except to the stainless steel wires group, no significant difference between metal brackets and plastic brackets. For the three types of brackets, TMA wires showed the highest frictional force and stainless steel wires showed the lowest. In addition, no significant difference between LH wires and Sentally Ni-Ti alloy wires were observed. Compared to the new archwire, from the SEM image at 1000 magnitude, the surface topography of the tested wires were quite different: LH wires and Sentally Ni-Ti alloy wires appeared full continuous lines due to the obvious difference of surface hardness of both wires and stainless steel wires. TMA wires showed irregular rough surface that are attributed to the phenomenon of adhesion and abrasion. Comparing the results from four types of archwires in this study, no correlation was found between the increase surface roughness and frictional force.
Reed, Barbra J. "A comparison of frictional forces of conventional ligation and self-ligation bracket systems." 1998. http://catalog.hathitrust.org/api/volumes/oclc/47978289.html.
Повний текст джерелаCavaleiro, João. "Evaluation of the behavior of different brackets on frictional forces during sliding mechanics." Master's thesis, 2013. http://hdl.handle.net/10316/36695.
Повний текст джерелаObjective: The purpose of this study is to compare, in vitro, the resistance to sliding generated by conventional, active self-ligating and passive self-ligating brackets with stainless steel and nickel-titanium wires and to evaluate the effect of binding upon resistance to sliding In addition to this, the influence of bracket´s slot surface characteristics on measured friction was estimated. Materials and Methods: The following 0,022 inch slot brackets were essayed: Damon® Q™, Prodigy SL™ (Sybron Dental Specialties Ormco™, Orange, California, USA), Smart-Clip™SL3, Victory Series™ (3M Unitek Orthodontic Products, Monrovia, California, USA), Morelli® Roth Standard and Morelli® Roth SLI (Morelli Ortodontia, Sorocaba, São Paulo, Brazil). These brackets were coupled with either 0.016 x 0.022 inch stainless steel (Dentaurum GmbH, Ispringen, Germany) or nickel-titanium (DM Ceosa, Madrid, Spain) archwires. Alicona InfiniteFocus® optical 3-dimensional micro coordinate system (Alicona Imaging GmbH, Grambach/Graz, Austria) and Alicona IFM version 3.5.1.5 software (Alicona Imaging GmbH, Grambach/Graz, Austria) were used for assessing roughness average, root mean square and mean peak to valley height of roughness profile of slot surface. For Damon brackets, a slot profile analysis was executed in order to evaluate the contact areas between bracket and archwire Results: Statistically significant higher resistance to sliding is observed in conventional brackets comparing to passive and active self-ligating brackets. No statistically significant differences were found between passive and active self-ligating brackets and between archwire materials in 0 degrees angulations. For 5 degrees angulations, stainless steel showed statistically significant higher resistance to sliding. No statistically significant differences in resistance to sliding were found between 0 and 5 degrees of bracket tipping. Higher values of roughness average and root mean square were correlated with friction forces lower than 3N while lower roughness values were associated with higher frictional forces. In Damon brackets, the embossed numbers in the slot are not likely to contact with the archwire since they are approximately 5.5μm lower than the lateral boxes. Conclusion: Self-ligating brackets are helpful for obtaining low frictional forces. When coupled with a small rectangular archwire, slight bracket angulations or tooth tipping may not influence resistance to sliding. However, different alloys reveal dissimilar frictional behavior when angulations are present. Surface roughness seems to have an inverse correlation with frictional forces.
Murray, William S. (William Scott). "Vehicle dynamic validation and analysis from suspension forces." Thesis, 2012. http://hdl.handle.net/1957/28477.
Повний текст джерелаGraduation date: 2012
Marquez, Alberto C. "Finite element analysis of welds attaching short doubler plates in steel moment resisting frames." Thesis, 2014. http://hdl.handle.net/2152/28259.
Повний текст джерелаtext