Bibliografias temáticas / Contact mechanism

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Literatura científica selecionada sobre o tema "Contact mechanism"

Autor: Grafiati
Publicado: 23 de novembro de 2024

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Artigos de revistas sobre o assunto "Contact mechanism"

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Mankame, Nilesh D., e G. K. Ananthasuresh. "A Novel Compliant Mechanism for Converting Reciprocating Translation Into Enclosing Curved Paths". Journal of Mechanical Design 126, n.º 4 (1 de julho de 2004): 667–72. http://dx.doi.org/10.1115/1.1759360.

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This paper introduces a novel contact-aided compliant mechanism that uses intermittent contacts to convert a single translatory reciprocating input into two output curves, which intersect to enclose a two dimensional region. Contact interactions endow contact-aided compliant mechanisms with enhanced kinematic and kinetostatic capabilities. The mechanism described in this paper is designed to undergo large deformations repeatedly, without yielding by avoiding flexural joints and by using contacts to obtain the desired deformation. A single-material, joint-free and planar design makes the mechanism easy and economical to fabricate at the macro or micro scales. The design is validated experimentally by manufacturing and testing macro scale prototypes. Two potential applications that motivated this mechanism are also noted.
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KO, Young-Joon, Dong Woo LEE e Jonghoon JUNG. "Mechanism of Contact Electrification". Physics and High Technology 30, n.º 1/2 (28 de fevereiro de 2021): 2–6. http://dx.doi.org/10.3938/phit.30.001.

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Contact electrification has been a well-known phenomenon since B.C. 300. However, the origin of triboelectric charge and the charge transfer mechanism are not well understood. To date, the thermionic emission model, Schottky model, flexoelectric model, and intermolecular force model have been proposed for the contact electrification in conductors, semiconductors, and insulators. This article briefly introduces several important research results on the simple-seeming, but baffling, topic of contact electrification.
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Askerov, Shahlar Gachayogli, M. G. Gasanov e L. KAbdullayeva. "The Influence of the Metal Microstructure on the Breakdown Mechanism of Schottky Diodes". Materials Physics and Chemistry 1, n.º 1 (15 de outubro de 2018): 1. http://dx.doi.org/10.18282/mpc.v1i1.565.

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In this paper, the influence of the microstructure of a metal on the breakdown mechanism of diodes with a Schottky barrier is studied. It is shown that in electronic processes occurring in the contact between a metal and a semi-conductor, the metal plays a very active role and is a more important contact partner than a semiconductor. Unlike the known mechanisms of breakdown of diodes (avalanche, tunnel and thermal), another mechanism is proposed in this paper - the geometric mechanism of the reverse current flow of Schottky diodes made using a metal with a poly-crystalline structure. The polycrystallinity of a metal transforms a homogeneous contact into a complex system, which consists of parallel-connected multiple elementary contacts having different properties and parameters.
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Qiu, Hao Dong, e Hong Wang. "Studies on Quasi-Static Au-to-Au Ohmic Contact for MEMS Switches". Advanced Materials Research 254 (maio de 2011): 136–39. http://dx.doi.org/10.4028/www.scientific.net/amr.254.136.

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In this paper, studies on “quasi-static” region of ohmic-contact behavior for MEMS switches under low contact force and low current conditions were carried out. Random telegraph signals (RTS) observed during the transition period were carefully investigated. It is found that RTS in transition region could be consistently identified by multiple characteristic time constants. The RTS behavior with multiple time constants suggests that different contact mechanisms could involve during “quasi-static” contact region. A dominant mechanism with time constant of ~1 ms was observed for the Au-to-Au contacts used in this study.
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Becker, Detlef, e Jurgen Knop. "Mechanism in allergic contact dermatitis". Experimental Dermatology 2, n.º 2 (abril de 1993): 63–69. http://dx.doi.org/10.1111/j.1600-0625.1993.tb00010.x.

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Shimizu, H., Y. Yokota, M. Mizuno e T. Kurokawa. "Wear mechanism in contact tube". Science and Technology of Welding and Joining 11, n.º 1 (fevereiro de 2006): 94–105. http://dx.doi.org/10.1179/174329306x77885.

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Khurramov, Shavkat, Shukhrat Hurramov e Akmal Sultonov. "Contact friction in roller mechanisms". E3S Web of Conferences 548 (2024): 06017. http://dx.doi.org/10.1051/e3sconf/202454806017.

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An analytical dependence was obtained that describes the patterns of friction stress distribution in the contact zone of roller mechanisms. The patterns of distribution of friction stresses from external forces acting on the roll supports, geometric and kinematic parameters of the roller mechanism, and strain properties of the processed material and elastic coatings of the rollers were determined. Mathematical models of friction stress of roller mechanisms were developed, considering the kinematics of the contact zone, the kinematic connection between the working rolls, and the compliance of the material being processed. It was established that the ratio of friction stress to normal stress at the points of the contact zone of the roller mechanism is not constant, but changes at each point of the contact zone.
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Huang, Weiqing, Qunyou Zhong, Dawei An, Chenglong Yang e Yi Zhang. "Mechanism and Experiment Study of Non-Contact Ultrasonic Assisted Grinding". Actuators 10, n.º 9 (14 de setembro de 2021): 238. http://dx.doi.org/10.3390/act10090238.

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Ultrasonic-assisted grinding processing can effectively reduce the surface roughness and enhance the processing efficiency in the processing of hard and brittle materials. However, the most common ultrasonic assisted grinding is a type of contact ultrasonic grinding where the grinding tool directly contacts the workpiece, which means that it is necessary to accurately control the pre-pressure of the grinding tool on the workpiece. The control of pre-pressure will inevitably increase the complexity of the grinding device, and it is easy to wear the workpiece because of improper pre-pressure control. In this paper, a non-contact ultrasonic grinding method is proposed and the machining mechanism of non-contact ultrasonic grinding is revealed. The resonant frequency of the ultrasonic vibration system and vibration amplitude of the grinding tool working face were simulated and experimentally tested, respectively. Then, the experiment of non-contact ultrasonic grinding of a sapphire wafer was carried out. The result showed that non-contact ultrasonic grinding of the sapphire wafer could reduce the surface roughness by 48.6%. Compared with traditional contact grinding of sapphire wafer under certain pre-pressure conditions, the experimental results show that non-contact ultrasonic grinding has better effects in reducing surface roughness, improving processing efficiency, and improving the quality uniformity of the workpiece machining surface.
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Kuchuk, Andrian V., Krystyna Gołaszewska, Vasyl P. Kladko, M. Guziewicz, Marek Wzorek, Eliana Kamińska e Anna Piotrowska. "The Formation Mechanism of Ni-Based Ohmic Contacts to 4H-n-SiC". Materials Science Forum 717-720 (maio de 2012): 833–36. http://dx.doi.org/10.4028/www.scientific.net/msf.717-720.833.

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In this work the electrical properties of Ni and Ni2Si contacts on n-type 4H-SiC were correlated to the strong structural changes at the contact/SiC interface upon annealing. We can conclude that only δ-Ni2Si grains play a main role in determining electrical transport properties of the Ni-based ohmic contacts to n-SiC. It is presumed that a recrystallization and texturization of δ-Ni2Si phase on (0001)SiC-surface during high temperature annealing (> 900°C) contributes to the change of barrier heights, as well as specific contact resistance of contacts.
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MAKABE, Chobin, Tateki YAFUSO, Takeshi SUZUKI e Hideo YARA. "Effect of Contact Conditions on Mechanism of Rolling Contact Fatigue." Journal of the Society of Materials Science, Japan 50, n.º 12 (2001): 1311–16. http://dx.doi.org/10.2472/jsms.50.1311.

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Teses / dissertações sobre o assunto "Contact mechanism"

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Dahlberg, Johan. "On the asperity point load mechanism for rolling contact fatigue". Doctoral thesis, Stockholm : Hållfasthetslära, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4569.

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Cai, Feng. "Evaluation of the mechanism of hypersensitivity to contact lens preseratives". Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61754.

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Alfredsson, Bo. "A study on contact fatigue mechanisms". Doctoral thesis, Stockholm, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3028.

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Gallagher, Christopher T. "Contact force control for continuous scanning coordinate measuring machines". Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/17319.

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Yoshida, Mutsumi. "Mechanism of biomaterial adjuvant effect phenotype of dendritic cells upon biomaterial contact /". Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-07152005-141108/.

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Thesis (Ph. D.)--Biomedical Engineering, Georgia Institute of Technology, 2006.
Babensee, Julia, Committee Chair ; Andres Garcia, Committee Member ; Mary Marovich, Committee Member ; Barbara Boyan, Committee Member ; Elliot Chaikof, Committee Member ; Cheng Zhu, Committee Member.
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Torres, James Ph D. Massachusetts Institute of Technology. "Large gain amplification mechanism for piezoelectric actuators utilizing a rolling contact joint". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74948.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 55-56).
Due to the limited displacement of piezoelectric stack actuators, common practice is to use some form of displacement amplification mechanism. An efficient, heavy-duty displacement amplification mechanism for piezoelectric stack actuators is presented in this thesis. The displacement amplification gain is increased by a factor of more than 100 in a single stage by using a buckling mechanism combined with a novel rolling contact design. Unlike traditional flexure-type monolithic mechanisms, which are accurate but inefficient and fragile, the new mechanism consists of all rolling contact couples, providing high stiffness, durability and energy efficient characteristics. Furthermore, a new design of pre-loading mechanism using shape memory alloy doubles the possible cyclic work output and provides a desirable restoring force for constraining the rolling contact mechanism stably and efficiently. This mechanism is intended to be interfaced with a sinusoidal gear cam that acts as the load. The dynamics of the system are derived and are shown to be fifth order. Due to the significantly nonlinear amplification caused by the buckling phenomenon and the gear, the dynamics are run in simulation to gain insight into the dynamic performance of the actuator. There is shown to be an optimal speed at which to run the actuator to maximize the possible power output. Furthermore, due to the simple binary control significant benefits are achieved by varying the control timing based on the velocity to ensure the force and velocity of the output are in phase. Finally, a prototype was constructed to compare to the static model. The prototype had a peak to peak displacement of 6.8 mm, an amplification of over 150, and produced a peak charged force of 56 Newtons.
by James Torres.
S.M.
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Jon, Sundh. "On wear transitions in the wheel-rail contact". Doctoral thesis, KTH, Maskinkonstruktion (Avd.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11563.

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Wear transitions in the wheel–rail contact are of increasing interest since the general trend in railway traffic is toward increased velocities and axle loads. Curving increases the risk of flanging, causing the contact to change from an almost pure rolling wheel tread–rail head contact to more of a sliding wheel flange–rail gauge contact on the high rail in curves. Under wheel flange–rail gauge contact conditions, wear transitions to severe or catastrophic wear will occur if the contact is improperly lubricated. Such a transition is the most undesirable transition in the wheel–rail contact, as it represents a very expensive operating condition for railway companies. The contact conditions responsible for this transition are very severe as regards sliding velocity and contact pressure, and thus place high demands on both the lubricant and the wheel and rail materials. The focus of this thesis is on the transitions between different wear regimes in a wheel–rail contact. Wear is discussed both in traditional tribological terms and in terms of the categories used in the railway business, namely mild, severe and catastrophic wear. Most of the work was experimental and was performed at the Royal Institute of Technology (KTH), Department of Machine Design. The effects of contact pressure, sliding velocity, and type of lubricant have been investigated, producing results that resemble those of other studies presented in the literature. The absence of research relating to the wheel flange–rail gauge contact is addressed, and it is concluded that a lubricant film must be present on rails in curves to prevent severe or catastrophic wear. The formulation of this lubricant can further increase its wear- and seizure-preventing properties. To obtain a deeper understanding of wear transitions, methods such as airborne particle measurement and electron microscopy have been used. Paper A presents the test methodology used to detect seizure and discusses the wear-reducing influence of free carbon in highly loaded contacts. Paper B presents the testing of seizure-initiating conditions for a range of environmentally adapted lubricants applied to wheel and rail materials; a transient pin-on-disc test methodology was used for the testing. Paper C presents the use of pin-on-disc methodology to study the wear-reducing effects of a wide range of lubricants. The best performing lubricant was a mineral oil containing EP and AW additives. Paper D relates wear rates and transitions to airborne particles generated by an experimentally simulated wheel–rail contact. The airborne particles generated varied in size distribution and amount with wear rate and mechanism. Paper E relates additional analysis techniques, such as FIB sectioning, ESCA analysis, airborne particle measurements, and SEM imaging of airborne wear particles, to the contact temperature.
QC 20100721
Samba 6
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Amuzuga, Kwassi. "Damage mechanism related to plasticity around heterogeneous inclusions under rolling contact loading in hybrid bearings ceramic/steel". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI154.

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La durée de vie des pièces mécaniques en contact est fortement affectée par la présence d'hétérogénéités dans le matériau, comme des renforts (fibres, particules), des précipités, des porosités, ou encore des fissures. Des hétérogénéités dures et de formes complexes peuvent créer des surcontraintes locales, initiatrices de fissures par fatigue à proximité de la surface de contact. Une analyse quantitative des surcontraintes créées par les hétérogénéités est nécessaire à la compréhension des mécanismes d'endommagement. Cette étude s'applique à des roulements de ligne d'arbre qui font partie des éléments critiques de moteurs en aéronautique. Elle vise à déterminer précisément la distribution du champ de pression sur l'aire effective de contact et à prédire le profil et l'évolution des champs de contraintes/déformations à chaque passage de la charge sur un volume élémentaire représentatif prenant en compte le gradient de dureté, la présence de carbures et l'existence des contraintes initiales d'origine thermochimique. Une partie de l’étude est consacrée au développement d’un solveur du problème de contact roulant élasto-plastique avec présence d’hétérogénéité par les méthodes semi analytiques assurant un excellent gain en temps et ressources de calculs. Ensuite, un algorithme homogénéisation a été conçu pour analyser le comportement effectif d’un massif élasto-plastique hétérogène sous indentation. Enfin une partie expérimentale est dédiée à la caractérisation microstructurale des aciers étudiés dans le but de déterminer leurs propriétés. Les analyses des résultats de cette étude concourent à soutenir que bien que les inclusions de particules non métalliques soient responsables de la haute résistance de ces matériaux, certaines d’entre elles (celles de longueur dépassant les dizaines de micromètre ou celles qui forment des chaines dans une direction particulière) deviennent, au cours des cycles de fatigue, les principales sources d’endommagement depuis l’échelle locale jusqu’à la rupture globale de la structure
The lifetime of contacting mechanical parts is strongly affected by the presence of heterogeneities in their materials, such as reinforcements (fibers, particles), precipitates, porosities, or cracks. Hard heterogeneities having complex forms can create local overstress that initiating fatigue cracks near the contact surface. The presence of heterogeneities influences the physical and mechanical properties of the material at microscopic and macroscopic scales. A quantitative analysis of the over-stresses generated by heterogeneities is necessary to the comprehension of the damage mechanisms. The present study is applied to rolling bearings which are the critical elements of the aero-engine's mainshaft. The performance required for these bearings, led SKF Aerospace to introduce a new technology of hybrid bearing with ceramic rolling elements on high-strength steels having experienced a double surface treatment (carburizing followed by nitriding). The study aims to precisely determine the pressure field distribution on the effective contact area and to predict the profile and the evolution of the stress/strain fields at each loading cycle on a representative elementary volume that takes into account the gradient of hardness, the presence of carbides and the existence of an initial compressive stress from thermochemical origin. A major part of this study is devoted to develop a heterogeneous elastic-plastic rolling contact solver, by semi-analytical methods ensuring an excellent saving of calculation time and resources. Thereafter, a homogenization algorithm was built to analyze the effective behavior of a heterogeneous elastic-plastic half-space subjected to an indentation loading. Finally, an experimental part is dedicated to the microstructure characterization of the studied steels with intent to determine their properties. A description of the carbides behavior inside the matrix during micro-tensile tests was carried out under SEM in-situ observation. In the scheme of all analyses conducted in the present work, it can be argued that, although the heterogeneities (such as carbides or nitrides) are responsible for the high resistance of the studied materials, some of them (those whose length exceeds tens of micrometer or those which form stringers in a particular direction) become, over fatigue cycles, the main sources of damage, from their local scale up to the macroscopic failure of the structure
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Lin, Yun Materials Science &amp Engineering Faculty of Science UNSW. "Contact deformation mechanism of complex carbon nitride and metal nitride based bi-layer coatings". Awarded by:University of New South Wales. Materials Science & Engineering, 2009. http://handle.unsw.edu.au/1959.4/44544.

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Hard wear-resistant coatings have been widely applied 10 cutting tools to increase their durability and improve tribological properties. Physical vapour deposited TiAIN-based coatings. used in dry cutting performances. Have shown excellent hot hardness and oxidation resistance. The main handicap of these coatings is their brittleness. Another type of coatings arc amorphous. rather than crystalline. for example those based on fullerene-like carbon nitride (CNx). Such coatings possess high elasticity. but relatively low hardness. In this study. bi-Iayer coatings. designed as 1I CNx-based outer layer and a TiAlN-based inner layer. were deposited on either a silicon substrate or a high speed steel M2 substrate. The CNx outer layer incorporated either Ti/AI or Cr to improve its hardness. Cr was also added to the TiAIN based inner layer in some of the coatings. Detailed microstructural characterization and nanoindentation. to assess contact damage. \\CTC carried out on these coatings. The results showed that the microstructure of these coatings plays a critical part in the contact response. The addition ofCr into the CNx layer improves the toughness of the CNx layer. It acts as an inhibitor to the propagation of shear cracks initiated from the inner TiAIN layer. The incorporation of Cr into the TiAIN-based inner layer results in refinement of grain size and solid solution hardening. subsequently, this hinders inter-columnar sliding. Which results in the plastic deformation occurring lit a higher load. The application of a Cr interlayer was found to enhance the adhesion strength between the coating and the substrate. It was found the thicker. and harder. coatings on the ductile steel substrate generated inclined and lateral cracking. In contrast. thinner coatings initiated inter-columnar sliding and shear cracking followed by substrate plastic now. In turn. significant edge cracking (circumferential cracking) occurred in the CNx outer layer along the periphery of indent. It was also noted that nano-indentation testing using both Berkovich and spherical indenters produced different mechanical response and deformation microstructures in the coatings deposited on silicon substrates.
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Cain, Jason James. "Collision Analysis of the Reversible Crankshaft Mechanism in a Convertible Refrigeration Compressor". Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/33479.

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The purpose of this study is to analyze the behavior of a reversible two-cylinder refrigerant compressor manufactured by Bristol Compressor Incorporated. This compressor contains a specialized linkage that causes the compressor to transition from a two-cylinder compressor to a single-cylinder compressor when the direction of rotation of the crankshaft is reversed. The linkage accomplishes this by reducing the throw of one cylinder to zero. Of interest are the conditions to which this linkage is subjected when the direction of rotation is again reversed, causing the compressor to return to its two-cylinder functioning. When this reversal takes place, a collision occurs within the linkage. These repeated collisions are thought to be the cause of fatigue failure of the linkage in many of these compressors. To verify that this collision is the problem, an understanding of the stress state during the collision is needed. This thesis begins the work necessary to determine the dynamic stress state present within the system. A FORTRAN program was developed that modeled the kinematic behavior of the system under operating conditions. The program predicts the accelerations, velocities, positions, and internal forces present within the system during startup conditions. Also, a method has been developed to model rotary sliding contact between two cylindrical surfaces. This method is developed and investigated in hopes that it will facilitate the modeling of the behavior of the compressor linkage in a dynamic finite element analysis.
Master of Science
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Livros sobre o assunto "Contact mechanism"

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United States. Government Accountability Office. Federal contact centers: Mechanism for sharing metrics and oversight practices along with improved data needed. Washington, DC: GAO, 2006.

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Snow, Edward Ramsey. Advances in grasping and vehicle contact identification: Analysis, design and testing of robust methods for underwater robot manipulation. Cambridge, Mass: Massachusetts Institute of Technology, 1999.

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3

Raous, M., M. Jean e J. J. Moreau, eds. Contact Mechanics. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1983-6.

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Martins, João A. C., e Manuel D. P. Monteiro Marques. Contact Mechanics. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-1154-8.

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Barber, J. R. Contact Mechanics. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70939-0.

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Johnson, K. L. Contact mechanics. Cambridge: CUP, 1985.

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L, Johnson K. Contact mechanics. Cambridge [Cambridgeshire]: Cambridge University Press, 1987.

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L, Johnson K. Contact mechanics. Cambridge [Cambridgeshire]: Cambridge University Press, 1985.

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Raous, M. Contact Mechanics. Boston, MA: Springer US, 1995.

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M, Raous, Jean M, Moreau J. J. 1923- e Contact Mechanics International Symposium (2nd : 1994 : Carry-le-Rouet, France), eds. Contact mechanics. New York: Plenum Press, 1995.

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Capítulos de livros sobre o assunto "Contact mechanism"

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Rozas-Muñoz, Eduardo, e Esther Serra-Baldrich. "Wheals and Eczema: Pathogenic Mechanism in Immediate Contact Reactions". In Contact Urticaria Syndrome, 65–73. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89764-6_6.

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Lateş, M. T., C. C. Gavrilă e R. Papuc. "Frictional Contact Study of the Chain Link/Polyamide Contact". In New Advances in Mechanism and Machine Science, 497–506. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-79111-1_49.

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Hejnová, M., e J. Ondrášek. "Life Estimation of the Contact Surfaces". In Advances in Mechanism Design II, 43–49. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44087-3_6.

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Švígler, J. "Kinematic Analysis of Screw Surface Contact". In New Trends in Mechanism Science, 63–72. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9689-0_8.

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Trubachev, Evgenii S. "Synthesis of Contact in Loaded Multi-pair Gears with a Big Contact Ratio". In Advances in Mechanism and Machine Science, 75–83. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-45709-8_8.

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Pleguezuelos, M., J. I. Pedrero e M. B. Sánchez. "Load Sharing and Contact Stress Calculation of High Contact Ratio Internal Spur Gears". In New Trends in Mechanism and Machine Science, 771–78. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09411-3_81.

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Ondrášek, Jiří. "Equivalent Contact Length of Load Disks and Specimen". In Advances in Mechanism Design III, 62–69. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83594-1_7.

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Pugliese, Giovanni, Enrico Ciulli e Francesco Fazzolari. "Experimental aspects of a cam-follower contact". In Advances in Mechanism and Machine Science, 3815–24. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20131-9_378.

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Chen, Yangzhi, e Xiongdun Xie. "Planar Helix Driving Contact Curve Line Gear Mechanism". In Advances in Mechanical Design, 11–22. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6553-8_2.

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Wang, Mingyang, Shuwen Li e Yuehai Sun. "Tooth Flank Modification of Line Contact Spiral Bevel Gears". In Advances in Mechanism and Machine Science, 35–44. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-45709-8_4.

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Trabalhos de conferências sobre o assunto "Contact mechanism"

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Robson, Nina, e Aaron Lee. "Spatial Mechanism-Environment Contact Geometric Models". In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-71380.

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Abstract This work proposes a theoretical foundation for a general spatial geometric mechanism-environment contact model. In the proposed model the curvature of the environment in the vicinity of the contact is approximated by a number of spherical surfaces with known radii of curvature that constrain/define the movement of the body. We show how the modeled body-environment contact and curvature constraints can be transformed into conditions on spatial velocity and acceleration (i.e. first and second order effects) of certain points of the moving body that can be incorporated in the kinematic task for designing spatial mechanisms. Further, we explore the exact synthesis of a spatial six degrees-of-freedom TPS kinematic chain which end-effector maintains contact with objects in the environment and varies orientation in the vicinity of a contact location. It is discussed how the higher order motion constraints allow for the introduction of kinematic task variations in the vicinity of a contact, resulting in different behaviors of the designed spatial mechanism. The theoretical foundation presented in this paper is crucial in gaining understanding of the constraints in describing mechanism-environment interactions in the vicinity of a contact and is a new contribution.
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Jones, Matthew H., e Steven A. Velinsky. "Contact Kinematics in the Roller Screw Mechanism". In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70254.

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This paper investigates the nature of the contact between the load transferring surfaces in the roller screw mechanism, i.e., between the screw and roller threads and between the nut and roller threads. The analysis is applied to both planetary roller screws and recirculating roller screws. Prior work has neglected to take a fundamental approach toward understanding the mechanics of the contact between these components, and as a consequence, detailed analysis of aspects such as contact mechanics, friction, lubrication, and wear are not carried out correctly. Accordingly, in this paper, the principle of conjugate surfaces is used to establish contact at the screw-roller and nut-roller interfaces. The in-plane angles to the contact points are derived and it is shown that for the screw-roller interface, the contact point cannot lie on the bodies’ line of centers as has been the assumption in previous papers. Then, based on the curved profile of the roller thread, the radii of contact on the roller, screw, and nut bodies are also derived. Knowledge of the contact point locations is necessary to understand the interaction forces between the key components of the roller screw mechanism. In addition, accurate estimates of the radii of contact are necessary for minimizing the phenomenon of roller migration, a condition that can cause binding between components and eventually lead to the destruction of the mechanism. Last, the principal radii of curvature at the contact points and the angle between the principal axes are derived. These are essential for further development of the contact mechanics, such as the surface stresses, deformations, and consideration of wear.
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Chen, Y. Z., Z. Chen e Y. Zhang. "Contact Ratio of Spatial Helix Gearing Mechanism". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86232.

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The contact ratio of spatial helix gear is deduced, and impacting factors of the contact ratio are analyzed. Then different design methods of contact ratio are discussed. The contact ratio could be designed flexibly. The theoretical gear ratio could be expanded to 36 with compact structure. The least tooth number of the driving wheel should be only 1. Numerical examples illustrate the design formula of contact ratio and the kinematics performance of the spatial helix gearing mechanism.
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Hyland, Jennifer E., Mary I. Frecker e George A. Lesieutre. "Optimization of Honeycomb Contact-Aided Compliant Cellular Mechanism for Strain Energy Absorption". In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71115.

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This paper presents the optimization of hexagonal honeycomb structures with internal contact mechanisms for energy absorption applications. While extensive work has been reported in the literature on traditional honeycombs of varying geometries under dynamic and static loading, contact-aided compliant cellular mechanisms under quasi-static crushing or impact have not been previously considered. This paper addresses this void through the optimization of a hexagonal honeycomb unit cell containing a contact mechanism. An optimization problem is formulated that maximizes the strain energy per area of a contact-aided compliant cellular mechanism. Two- and three-variable optimization problems are considered, using variables that define the cell geometry and the initial contact gap. It is found that with the addition of a contact mechanism, more strain energy can be absorbed when compared to the same cell without a contact mechanism.
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Jiang, Hongkui, Xianchun Song, Xiangrong Xu, Wencheng Tang, Chunling Zhang e Yuming Han. "Multibody Dynamics Simulation of Balls Impact-Contact Mechanics in Ball Screw Mechanism". In 2010 International Conference on Electrical and Control Engineering (ICECE). IEEE, 2010. http://dx.doi.org/10.1109/icece.2010.328.

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Wada, Shin-ichi, e Koichiro Sawa. "Degradation Phenomena of Electrical Contacts Using Hammering Oscillating Mechanism and Micro-Sliding Mechanism- Contact Resistance and Its Model". In 2011 IEEE 57th Holm Conference on Electrical Contacts (Holm 2011). IEEE, 2011. http://dx.doi.org/10.1109/holm.2011.6034821.

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Lin, M. C., B. Ravani e S. A. Velinsky. "Kinematics of the Ball Screw Mechanism". In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0141.

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Abstract This paper studies the kinematics of the Ball Screw Mechanism (BSM) with the aim of developing a foundation for understanding the motion of the balls and their contact patterns with the contacting elements. It is shown that there is always slip between the balls and the nut or screw, and therefore, the no slip condition assumed in the BSM literature is not attainable. The effect of contact deformation on the motion of the balls is also studied and is used to develop the pattern of the constant sliding lines of contacts between the ball and the screw or the nut. The results have applications in efficiency analysis, design, wear analysis and finite element modeling of the BSM.
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Kang, Young Sup, Ryan D. Evans e Gary L. Doll. "Contact Mechanism of Tribological Coatings With Columnar Microstructure". In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71119.

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Tribological coatings for mechanical components such as bearings and gears can experience failure occurring at the surface for highly localized contact conditions. In the present study, a finite element analysis (FEA) model was developed to study the stress distribution and deformation of tungsten carbide reinforced amorphous hydrocarbon coatings with and without columnar microstructures under nanoindentation. Results show that the microstructure of these tribological coatings significantly influences the stress distribution and deformation under heavily loaded conditions.
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Aguirre, Milton E., e Mary Frecker. "Design of a Multi-Contact-Aided Compliant Mechanism". In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48637.

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This work is part of a multidisciplinary project developing design and manufacturing methods for narrow-gauge surgical instruments intended for advanced minimally invasive surgery. The instruments are designed specifically for Penn State’s lost mold rapid infiltration forming process, which is capable of fabricating hundreds of freestanding meso-scale parts. In previous work, a 1 mm diameter forceps case study demonstrated the design and fabrication process. The forceps is a monolithic compliant mechanism (CM) that relies on contact to re-distribute maximum stresses to generate larger elastic tip deflections; a phenomenon defined here as contact stress-relief. Prototypes were developed and evaluated in an end user surgical simulator. Feedback from 11 clinicians identified the total jaw opening of the forceps must be increased in the next generation of prototypes. This paper focuses on exploiting the benefits of contact-aided compliant mechanism (CCM) design to obtain larger elastic tip deflections and thus jaw openings. Using the commercially available finite element software package ANSYS to model large deformation and contact, an optimization problem is developed to determine the effects of incorporating additional contact elements in a CCM design on maximizing elastic tip deflection. Results show that designs with multiple contact elements generate larger elastic tip deflections due to a multi-stage contact stress-relief profile.
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Font, G., J. Soldi, C. Pere e D. Hastings. "Arcing mechanism of wrap-through-contact solar cells". In 33rd Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-597.

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Relatórios de organizações sobre o assunto "Contact mechanism"

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Lever, James, Emily Asenath-Smith, Susan Taylor e Austin Lines. Assessing the mechanisms thought to govern ice and snow friction and their interplay with substrate brittle behavior. Engineer Research and Development Center (U.S.), dezembro de 2021. http://dx.doi.org/10.21079/1168142742.

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Sliding friction on ice and snow is characteristically low at temperatures common on Earth’s surface. This slipperiness underlies efficient sleds, winter sports, and the need for specialized tires. Friction can also play micro-mechanical role affecting ice compressive and crushing strengths. Researchers have proposed several mechanisms thought to govern ice and snow friction, but directly validating the underlying mechanics has been difficult. This may be changing, as instruments capable of micro-scale measurements and imaging are now being brought to bear on friction studies. Nevertheless, given the broad regimes of practical interest (interaction length, temperature, speed, pressure, slider properties, etc.), it may be unrealistic to expect that a single mechanism accounts for why ice and snow are slippery. Because bulk ice, and the ice grains that constitute snow, are solids near their melting point at terrestrial temperatures, most research has focused on whether a lubricating water film forms at the interface with a slider. However, ice is extremely brittle, and dry-contact abrasion and wear at the front of sliders could prevent or delay a transition to lubricated contact. Also, water is a poor lubricant, and lubricating films thick enough to separate surface asperities may not form for many systems of interest. This article aims to assess our knowledge of the mechanics underlying ice and snow friction.
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Lever, James, Susan Taylor, Arnold Song, Zoe Courville, Ross Lieblappen e Jason Weale. The mechanics of snow friction as revealed by micro-scale interface observations. Engineer Research and Development Center (U.S.), dezembro de 2021. http://dx.doi.org/10.21079/11681/42761.

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The mechanics of snow friction are central to competitive skiing, safe winter driving and efficient polar sleds. For nearly 80 years, prevailing theory has postulated that self-lubrication accounts for low kinetic friction on snow: dry-contact sliding warms snow grains to the melting point, and further sliding produces meltwater layers that lubricate the interface. We sought to verify that self-lubrication occurs at the grain scale and to quantify the evolution of real contact area to aid modeling. We used high-resolution (15 μm) infrared thermography to observe the warming of stationary snow under a rotating polyethylene slider. Surprisingly, we did not observe melting at contacting snow grains despite low friction values. In some cases, slider shear failed inter-granular bonds and produced widespread snow movement with no persistent contacts to melt (μ < 0.03). When the snow grains did not move and persistent contacts evolved, the slider abraded rather than melted the grains at low resistance (μ < 0.05). Optical microscopy revealed that the abraded particles deposited in air pockets between grains and thereby carried heat away from the interface, a process not included in current models. Overall, our results challenge whether self-lubrication is indeed the dominant mechanism underlying low snow kinetic friction.
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Muñoz Fernandez, Cristina, e Patricia Henriquez. IDB Environmental and Social Grievance Protocol: 2023 Annual Report. Inter-American Development Bank, setembro de 2024. http://dx.doi.org/10.18235/0013137.

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Since November 2021, when the Environmental and Social Policy Framework entered into effect, the IDB has a direct channel, at the management level, for stakeholders to contact the institution directly when they wish to file a complaint about the environmental or social performance of IDB-financed projects. The IDB Grievance Protocol is part of the IDB Group's complaint system, through which the first line of attention to users is the project-level complaint and grievance mechanism. Users can also access IDB management grievance mechanisms, and as a last resort, the Independent Consultation and Investigation Mechanism (MICI). This annual IDB Grievance Protocol report provides an overview of grievances received and handled related to environmental and/or social issues in 2023. It includes key issues, comparative data from the two years of the Grievance Protocol implementation, lessons learned, and information regarding outreach efforts and next steps.
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Parkins. L51743 Stress Corrosion Cracking of Pipelines in Contact with Near-Neutral pH Solutions. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), julho de 1995. http://dx.doi.org/10.55274/r0010322.

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While much has been learned about low pH stress corrosion cracking in the decade since it was recognized, a review of the published papers and reports since the last overview of the subject in 1992 indicates that there is still much to be understood about this matter. Most of the laboratory studies have involved dilute solutions based upon those found in the vicinity of cracks in operating lines, but the possible role of bacteria, for which there is supporting field evidence, has not received systematic study. The trans-granular service cracking has been reproduced in the laboratory, most readily when relatively high stresses and/or strains are applied to specimens, but there is still difficulty in reproducing cracking in the laboratory with stressing conditions similar to those on an operating pipeline. If meaningful modeling of low pH cracking is to be achieved, there is need for more data on crack initiation and the early stages of growth with stressing conditions no overly excessive by comparison with service conditions. There is also a need, related to modeling, of an understanding of the mechanistic aspects of cracking, since while it is known, not least from visible evidence of corrosion on the sides of cracks, that dissolution occurs within the crack enclave, there is indirect evidence that the ingress of hydrogen into the steel may be involved also in the overall crack growth process. If hydrogen is involved then existing models based upon high pH cracking, and involving a quantifiable dissolution mechanism, will not be directly applicable to the low pH problem.
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Ibáñez, Ana María, Sandra Rozo e Maria J. Urbina. Forced Migration and the Spread of Infectious Diseases. Inter-American Development Bank, novembro de 2020. http://dx.doi.org/10.18235/0002894.

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We examine the role of Venezuelan forced migration on the propagation of 15 infectious dis-eases in Colombia. For this purpose, we use rich municipal-monthly panel data. We exploit the fact that municipalities closer to the main migration entry points have a disproportionate ex-posure to infected migrants when the cumulative migration flows increase. We find that higher refugee inflows are associated with increments in the incidence of vaccine-preventable dis-eases, such as chickenpox and tuberculosis, as well as sexually transmitted diseases, including AIDS and syphilis. However, we find no significant effects of migration on the propagation of vector-borne diseases. Contact with infected migrants upon arrival seems to be the main driving mechanism.
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Guduru, Pradeep R. Biologically Inspired Nano-Contact Mechanics. Fort Belvoir, VA: Defense Technical Information Center, julho de 2009. http://dx.doi.org/10.21236/ada503356.

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Taylor, Karen, Emily Moynihan e Information Technology Laboratory (U S. ). Information Science and Knowledge Management Branch. The Forefront : A Review of ERDC Publications, Spring 2021. Engineer Research and Development Center (U.S.), junho de 2020. http://dx.doi.org/10.21079/11681/40902.

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The Engineer Research and Development Center (ERDC) is the premier civil works engineering and environmental sciences research and development arm of the U.S. Army Corps of Engineers (USACE). As such, it partners with the Army, Department of Defense (DoD), federal agencies, and civilian organizations to help solve our Nation’s most challenging problems in civil and military engineering, geospatial sciences, water resources, and environmental sciences. A special government knowledge center, ERDC Information Technology Laboratory’s Information Science and Knowledge Management (ISKM) Branch is critical to ERDC’s mission, fulfilling research requirements by offering a variety of editing and library services to advance the creation, dissemination, and curation of ERDC and USACE research knowledge. Serving as the publishing authority for the ERDC, ISKM publishes all ERDC technical publications to the Digital Repository Knowledge Core, sends a copy to the Defense Technical Information Center (DTIC) and creates a press release about each publication on the ERDC website. The Forefront seeks to provide an additional mechanism for highlighting some of our technical publications to the ERDC, USACE, Army, and DoD communities. This publication also encourages those outside ERDC to contact us about using ERDC editing services. For more information regarding the reports highlighted in this publications or others that ERDC researchers’ have created, please contact the ISKM virtual reference desk at erdclibrary@ask-a-librarian.info or visit the ISKM’s online repository, Knowledge Core, at https://erdc-library.erdc.dren.mil/ .
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Tupek, Michael, e Brandon Talamini. Optimization-based algorithms for nonlinear mechanics and frictional contact. Office of Scientific and Technical Information (OSTI), setembro de 2021. http://dx.doi.org/10.2172/1820695.

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Barbir, A., B. Cain, R. Nair e O. Spatscheck. Known Content Network (CN) Request-Routing Mechanisms. RFC Editor, julho de 2003. http://dx.doi.org/10.17487/rfc3568.

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Burger, E., ed. A Mechanism for Content Indirection in Session Initiation Protocol (SIP) Messages. RFC Editor, maio de 2006. http://dx.doi.org/10.17487/rfc4483.

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