Relevant bibliographies by topics / Pulley Mechanisms

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Pulley Mechanisms'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Pulley Mechanisms"

1

Thurtell, Matthew J., Mikhail Kunin, and Theodore Raphan. "Role of Muscle Pulleys in Producing Eye Position-Dependence in the Angular Vestibuloocular Reflex: A Model-Based Study." Journal of Neurophysiology 84, no. 2 (August 1, 2000): 639–50. http://dx.doi.org/10.1152/jn.2000.84.2.639.

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It is well established that the head and eye velocity axes do not always align during compensatory vestibular slow phases. It has been shown that the eye velocity axis systematically tilts away from the head velocity axis in a manner that is dependent on eye-in-head position. The mechanisms responsible for producing these axis tilts are unclear. In this model-based study, we aimed to determine whether muscle pulleys could be involved in bringing about these phenomena. The model presented incorporates semicircular canals, central vestibular pathways, and an ocular motor plant with pulleys. The pulleys were modeled so that they brought about a rotation of the torque axes of the extraocular muscles that was a fraction of the angle of eye deviation from primary position. The degree to which the pulleys rotated the torque axes was altered by means of a pulley coefficient. Model input was head velocity and initial eye position data from passive and active yaw head impulses with fixation at 0°, 20° up and 20° down, obtained from a previous experiment. The optimal pulley coefficient required to fit the data was determined by calculating the mean square error between data and model predictions of torsional eye velocity. For active head impulses, the optimal pulley coefficient varied considerably between subjects. The median optimal pulley coefficient was found to be 0.5, the pulley coefficient required for producing saccades that perfectly obey Listing's law when using a two-dimensional saccadic pulse signal. The model predicted the direction of the axis tilts observed in response to passive head impulses from 50 ms after onset. During passive head impulses, the median optimal pulley coefficient was found to be 0.21, when roll gain was fixed at 0.7. The model did not accurately predict the alignment of the eye and head velocity axes that was observed early in the response to passive head impulses. We found that this alignment could be well predicted if the roll gain of the angular vestibuloocular reflex was modified during the initial period of the response, while pulley coefficient was maintained at 0.5. Hence a roll gain modification allows stabilization of the retinal image without requiring a change in the pulley effect. Our results therefore indicate that the eye position–dependent velocity axis tilts could arise due to the effects of the pulleys and that a roll gain modification in the central vestibular structures may be responsible for countering the pulley effect.
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Gerbert, G. "Belt Slip—A Unified Approach." Journal of Mechanical Design 118, no. 3 (September 1, 1996): 432–38. http://dx.doi.org/10.1115/1.2826904.

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Slip measurements on thick flat belts, V-belts and V-ribbed belts running on small pulleys reveal that the slip is much higher than can be predicted with classical creep theory. Shear creep plays an important role and special care must be taken when analyzing the shear deflection of the V-belt and the ribs of the V-ribbed belt. Other mechanisms are present as well. The behavior in the seating and unseating regions changes the direction of the frictional forces in these regions on the driver pulley. A unified slip theory is presented for flat belts, V-belts and V-ribbed belts considering creep, shear, seating/unseating and compliance. Measurements and theory fit very well for practical tension levels. At low tension the measured slip is higher than the predicted one for V-belts and V-ribbed belts, which probably depends on the poor fit between the belt and the grooved pulley.
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Liang, Yunlei, Zhijiang Du, Weidong Wang, and Lining Sun. "A Novel Position Compensation Scheme for Cable-Pulley Mechanisms Used in Laparoscopic Surgical Robots." Sensors 17, no. 10 (September 30, 2017): 2257. http://dx.doi.org/10.3390/s17102257.

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Eyvazova, Z. E., and T. E. Farajov. "Analysis of the performance indicators of oil well sucker-rod pumps." Dependability 18, no. 3 (September 5, 2018): 22–26. http://dx.doi.org/10.21683/1729-2646-2018-18-3-22-26.

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The paper notes that as the depths of operated wells grow, the application of cable and pulley mechanisms becomes preferable as compared to the existing pumpjacks. A generalized theoretical analysis of the kinematics of cable and pulley drives is set forth. The authors present the general theoretical analysis of the kinematics of the above mechanisms, as well as the results of computer calculations based of the developed equations for a number of cases. Further analysis of the results showed that the crank mechanisms of a rope pulley have “smooth” kinematics. The research resulted in a proposed invention of the design of mast-type oil well sucker-rod pump drive with lower steel intensity and power consumption that would allow increasing the performance of sucker-rod pumps.The Purpose of this article consists in finding a utility model of a pump for the well rod in order to ensure the environmental safety of the equipment. That is achieved by lightening the metal structure of the pump with rotary stem and energy consumption is reduced. In the context of this problem, some calculations were performed in order to prove the system’s dependability. Based on the performed calculations it was established that the light structure can be used instead of the old heavy structure being its environmentally safe version. Experimental studies conducted by AzINMASH Research and Design Institute of Petroleum Engineering (Baku, Azerbaijan) indicate the feasibility of normal operation of sucker-rod pumps under the condition that n∙S = 54÷60 m/min. The authors examined the dependence between the peak output Q and the number of strokes n for various standard pumpjack sizes. The analysis of the parameters shown that the value of the product n∙S in the existing pumpjacks is below the recommendations based on experimental data, i.e. there is a tangible opportunity of increasing the productivity by extending the stroke of the rod hanger center, since well pump barrels may be as long as 6 to 7 meters. Estimates show that while studying the kinematics of long-stroke drives the changes in the length of the rope may be practically disregarded due to the displacement of the rope-to-pulley contact point. This simplifies the formulas that describe the kinematics of this type of long-stroke drives. Using the resulting formulas, comparative computer calculations for various cases were performed. It is shown that cable and pulley mechanisms have “softer” kinematics. The calculations confirmed the advisability of modification of the pump’s design that ensured reduced pollution of environment and energy savings. The future world will need renewable sources of energy, more power-efficient oil and gas production, minimal or zero pollution of the environment, thus the proposed solution appears to be of relevance. The authors propose a more productive design of sucker-rod pump that is easy to install and maintain at oil and gas production facilities. That can be achieved based on the calculations mentioned above.
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Chen, Jia Chuan, and Jing Yu Liu. "A Photographing and Shooting Device Delivery System." Advanced Materials Research 510 (April 2012): 507–11. http://dx.doi.org/10.4028/www.scientific.net/amr.510.507.

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Related to the technological field of Photographing and Shooting Support Device, a Photographing and Shooting Device Delivery System includes shooting track and its Device Case. A shooting track covers at least a set of track-flexible track units. Each single unit in the meantime owns two main tracks and at least two horizontal track axes which inset between the two main tracks. The horizontal track axis can meet the needs of the length-adjustment devices in stretching out and drawing back the length of axes. A single Shooting Track Device Case consists of a Roker, Case itself, two Pulley Mechanisms that attached to the bottom of the Case, as well as a position device that has the Rocker fixed. The Rocker can take apart and connect with the Case through Position Device. At least one axis moving mechanism is attached to the Pulley Mechanism Device, which can collapse the length in order to the change of axis. In doing so, it will not only cut down the expense but also save labor. By replacing the tripod spider in positioning through the Rocker, it can boost enormous convenience, make shooting in a low angle into a reality, and occupies relatively a smaller space compared with the tripod spider.
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Chen, Tien Li, Tsing Tshih Tsung, Liang Yu Yang, and Ho Chang. "Driving Force Testing of Lift Mechanism for Green Energy Furniture." Advanced Materials Research 201-203 (February 2011): 2803–6. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2803.

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The purpose of this study is testing the force of green energy lift mechanism and analyzes its result to get the key technology for green energy (saving force and energy). At first, the green energy lift mechanisms on the market are surveyed, then the mechanism are analyzed in this study. The force balance system of the mechanism is used to save force and energy. The position limitation of saving force and energy for the force balance system will be investigated. Universal testing machine is used to test the driving force by the different loads during the lift mechanism moving downward. The tested results of the driving force will be estimated. The study results show that the loads influence significantly the driving force. The angle between pulley and wire is the key factor of the driving force.
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Wang, Hongbo, Jun Kinugawa, and Kazuhiro Kosuge. "Exact Kinematic Modeling and Identification of Reconfigurable Cable-Driven Robots With Dual-Pulley Cable Guiding Mechanisms." IEEE/ASME Transactions on Mechatronics 24, no. 2 (April 2019): 774–84. http://dx.doi.org/10.1109/tmech.2019.2899016.

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Václavík, Jaroslav, and Pavel Polach. "Experimental Verification of the Properties of Fibres for the Mechanisms Based on Parallel Kinematic Structures." Applied Mechanics and Materials 486 (December 2013): 195–200. http://dx.doi.org/10.4028/www.scientific.net/amm.486.195.

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The paper was written in the framework of research in mechanisms of the increased mobility on the basis of parallel kinematic structures, for which a fibre control instead of rigid elements is designed. The experiment is focused on the verification of the fibre properties in simplified mechanical systems such as motion on an inclined plane, vibration of a moving weight hanging on a fibre and fibre interaction with two types of pulley. The arrangement and instrumentation of the experimental stand and of the system for the measurement of position and axial forces in a fibre are described. The results should serve for tuning the computational model, the results of which are also presented in the framework of specific experiments.
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Tawi, Kamarul Baharin, Izhari Izmi Mazali, Bambang Supriyo, Nurulakmar Abu Husain, Mohd Salman Che Kob, and Yusrina Zainal Abidin. "Pulleys' Axial Movement Mechanism for Electro-Mechanical Continuously Variable Transmission." Applied Mechanics and Materials 663 (October 2014): 185–92. http://dx.doi.org/10.4028/www.scientific.net/amm.663.185.

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Pulley-based continuously variable transmission (CVT) with Metal Pushing V-belt (V-belt) is a type of automotive transmission that is widely applied currently by many car manufacturers worldwide. Unlike the conventional automotive transmissions, in a pulley-based CVT with V-belt, the transmission ratio (CVT ratio) is changed continuously without the use of discrete gears. Instead, the CVT ratio is varied through the simultaneous axial movement of the primary pulley and the secondary pulley. By axially moving both pulleys simultaneously, the radius of the V-belt on both pulleys will be changed accordingly, resulting in the change of the CVT ratio. The existing pulley-based CVTs in the market use electro-hydro-mechanical (EHM) actuation system to change and to maintain the desired CVT ratio through the hydraulic pressure. However, the application of EHM actuation system leads to some disadvantages, particularly in term of the high power consumption from the engine needed to maintain the desired CVT ratio. This reduces the efficiency of the powertrain system, which eventually increases the fuel consumption of the vehicles. In addition to that, the existing pulley-based CVTs also use single acting pulley mechanism to axially move the pulleys for changing the CVT ratio. Therefore, the issue of V-belt's misalignment, which shortens the lifespan of the V-belt, is inevitable here. In this paper, the pulleys' axial movement mechanism that uses electro-mechanical (EM) actuation system is proposed. Consequently, the working principle of the proposal is described and its potential benefits are discussed.
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Inoue, Motohiro, Miwa Nakajima, Tatsuya Hojo, Megumi Itoi, and Hiroshi Kitakoji. "Acupuncture for the Treatment of Trigger Finger in Adults: A Prospective Case Series." Acupuncture in Medicine 34, no. 5 (October 2016): 392–97. http://dx.doi.org/10.1136/acupmed-2016-011068.

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Objective To determine the effect of acupuncture performed at the synovial and ligamentous tendon sheath (A1 pulley site) on pain during snapping and the severity of the snapping phenomenon in patients with trigger finger. Methods In this observational study, changes in the patients’ condition were compared before and after acupuncture treatment. Acupuncture was performed on 19 fingers of 15 patients. Acupuncture needles were inserted into the radial and ulnar sides of the flexor tendon at the A1 pulley of the affected finger. Treatment was performed daily up to a maximum of five times. Before and after each treatment, pain during snapping and the severity of snapping were evaluated using a visual analogue scale (VAS). Results VAS scores for pain and snapping severity were significantly improved immediately after the first treatment (p<0.001). Pain during snapping, assessed before each treatment, improved over time, reaching statistical significance from the second treatment onwards (p<0.001); similarly, a significant improvement in the severity of snapping was observed, also from the second treatment (p<0.001). Patients with clinically significant improvements (≥50%) in pain and snapping severity had a significantly shorter duration of the disorder than those with <50% improvement (p<0.05). Conclusions Acupuncture at the impaired A1 pulley site may be an effective treatment for trigger finger. We postulate that acupuncture may reduce inflammation/swelling of the synovial membrane of the tendon sheath, which predominates when the disorder is of short duration. Further research is required to confirm the efficacy/effectiveness of acupuncture for trigger finger and its mechanisms of action.
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Dissertations / Theses on the topic "Pulley Mechanisms"

1

Snow, Edward Ramsey. "The load/deflection behavior of pretensioned cable-pulley transmission mechanisms." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/36477.

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Yazicioglu, Faruk. "Design And Implementation Of A Two-axes Linear Positioning System For Rapid Prototyping Applications." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608835/index.pdf.

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In this study, a two axes linear positioning system for testing and applying different rapid prototyping techniques was designed and manufactured. A cable/ pulley mechanism is utilized in the system for transmitting motion from motors into linear motion. Use of a cable/ pulley mechanism overcomes the problems resulting from the utilization of conventional drive systems like ball screws and decreases the overall cost of the system. The carriage elements of both axes were designed and manufactured by using investment casting. The molds used in casting were also designed and manufactured within this study. The designed system is controlled by a servo motion control system composed of a motion controller, DC servo motors and linear encoders. All elements of the motion control system were selected, integrated and programmed within the scope of the study.
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Kong, Lingyuan. "Coupled belt-pulley mechanics in serpentine belt drives." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1069789616.

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Adam, Petr. "Pomocná jeřábová kočka licího jeřábu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241179.

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This master thesis deals with issue design of crab trolley. Concretely is acted about auxiliary crab trolley with required capacity 65 000 kg. This crab is on overhead crane, which is situated at hall of foundry. In particular chapters is processed design of lifting mechanism and travelling mechanism, which is amended to strength control of frame. This whole leads to output solutions, which is drawing documentation.
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Albagli, D. (Douglas). "Fundamental mechanisms of pulsed laser ablation of biological tissue." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/33521.

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Castera, Philippe. "Energy coupling mechanisms in pulsed surface discharges for flow control." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2015. http://www.theses.fr/2015ECAP0041/document.

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Ce travail s'intéresse aux effets mécaniques créés par les décharges de surface et à leur efficacité comme actionneur. Une géométrie particulière d'électrodes permet de créer de manière pulsée un filament linéaire de plasma et de le chauffer très rapidement par effet Joule (à raison de plusieurs Joules en moins d'une microseconde). Ce chauffage rapide entraîne la formation d'ondes de choc qui peuvent interagir avec l'écoulement ambiant.Nous étudions le comportement électrique de la décharge de surface afin d'évaluer l'énergie déposée dans le filament de plasma par effet Joule. Pour ce faire, nous réalisons une étude paramétrique sur la configuration du circuit et nous déterminons les principaux paramètres qui pilotent la dynamique de la décharge. Différents modèles de résistance sont utilisés dans un code de simulation du circuit électrique, et leurs prédictions du courant et du dépôt d'énergie sont confrontées aux mesures expérimentales.Des mesures spectroscopiques dans différentes configurations de circuit donnent accès à certaines propriétés de la décharge comme la densité électronique, qui atteint des valeurs de 2x1018 cm-3. Le rayon du canal est également mesuré par imagerie rapide. Les ondes de chocs créées par la décharge de surface sont visualisées en imagerie Schlieren pour plusieurs configurations de circuit. Ces ondes de chocs créent une impulsion proportionnelle à l'énergie déposée dans la décharge. Nos développons un modèle de choc pour décrire la trajectoire du choc et pour calculer l'impulsion communiquée par la décharge de surface. Le modèle est en bon accord avec les mesures expérimentales et la décharge de surface a une efficacité mécanique de 0.12mNs/J pour notre configuration d'étude. Nous terminons cette étude en comparant cet actionneur potentiel avec d'autres actionneurs courants et proposons plusieurs pistes pour de futurs travaux
In this study, we investigate the mechanical effects generated by pulsed surface discharges and their efficiency as an actuator. Using a specific electrode configuration, it is possible to create a short-lived, pulsed, rectilinear plasma channel and to heat it up rapidly (several Joules in less than a microsecond) through Joule heating. This fast energy deposition causes the formation of shock waves that can then interact with the surrounding flow.We study the electrical behavior of the pulsed surface discharge to assess the energy deposited in the plasma channel through Joule heating. To do so, we perform a parametric study on the circuit configuration and identify the main parameters driving the discharge dynamics. Several resistance models are implemented in a numerical description of the electrical circuit and their predictions of the current and deposited energy are compared with experimental measurements.Spectroscopic measurements in different circuit configurations give access to some of the plasma properties such as the electron number density that can reach values up to 2x1018 cm-3. Fast imaging also gives insight into the plasma channel radius. The shock waves generated by the pulsed surface discharge in different circuit configurations are visualized through Schlieren imaging. These shock waves generate an impulse that increases linearly with the energy deposited in the discharge. We develop a shock model to describe the shock trajectory and to compute the impulse imparted by the pulsed surface discharge. The model is in good agreement with our measurements and the pulsed surface discharge is found to have a mechanical efficiency of 0.12 mNs/J for our setup configuration. We conclude this study by comparing the proposed pulsed surface discharge actuator with other common designs and offer some directions for future studies
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Kubánek, Jan. "Lanový drapák." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228815.

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When soluting the contruction of a grab dredger we will deal with suitable solution with reference to its using and capacity, possibilites of its setting in low temperatures and incidental aplication of the exchangeable abrasion - resistant mouldings. There will be made a calculation of forces taking effect on a grab dredger and a check calculation of the chosen structural parts.
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Yalukova, Olga. "Interaction mechanisms of pulsed laser beams at different wavelengths with matter." Licentiate thesis, Luleå, 2004. http://epubl.luth.se/1402-1757/2004/029.

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Scharlemann, Carsten A. "Investigation of thrust mechanisms in a water fed pulsed plasma thruster." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1070354149.

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Ladogana, Santino. "Kinetics and Mechanisms of Metal Carbonyls." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc278709/.

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Pulsed laser flash photolysis with both visible and infrared detection has been applied to the study of the displacement of weakly coordinating ligands (Lw) by strongly "trapping" nucleophiles (Ls) containing either an olefinic functionality (Ls = 1-hexene, 1-decene, 1-tetradecene) or nitrogen (Ls = acetonitrile, hydrocinnamonitrile) from the photogenerated 16 electron pentacarbonylchromium (0) intermediate. 5-Chloropent-l-ene (Cl-ol), a potentially bidentate ligand, has been shown to form (ol-Cl) pentacarbonylchromium (0), in which Cl-ol is bonded to Cr via a lone pair on the chlorine, and isomerize to (Cl-ol) pentacarbonylchromium (0), in which Cl-ol is bonded to the olefinic functionality on the submillisecond time scale. This process has been studied in both the infrared and visible region employing both fluorobenzene or n-heptane as the "inert" diluent. Parallel studies employing 1-chlorobutane and 1-hexene were also evaluated and showed great similiarity with the Cl-ol system. The data supported a largely dissociative process with a possibility of a small interchange process involving the H's on the alkyl chain. Studies were also carried out for various Cr(CO)6/arene/Ls systems (arene = various alkyl or halogenated substituted benzenes). The data indicated that for both C6H5R (R=various alkyl chains) or multi-alkyl substituted arenes (i.e. o-xylene, 1,2,3-trimethylbenzene) containing an "unhindered" ring-edge, bonding to the the Cr(CO)5 moiety occurs "edge on" via a partially delocalized center of unsaturation on the ring. The data indicated that both electronic and steric properties of the arenes influence the kinetics, and that an interchange pathway takes place at least, in part, through the alkyl chains on both the arenes and "trapping" nucleophiles. Moreover, halogenated arenes bond through the lone pair on the halogen for both CI- and Br- derivatives but "edge-on" for the fluorinated arenes. Finally, in the case of arene complexes without and "unhindered" ring-edge (i.e., 1,2,3,4,5-pentamethylbenzene) bonding can occur either "edge-on" or through the ring center of the arene or combination of the two. Carbonyl stretching frequencies for the arenes are also indicative of the type of bonding.
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Books on the topic "Pulley Mechanisms"

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Roseann, Feldmann, ed. Put Pulleys to the Test. Minneapolis: Lerner Publications Co., 2012.

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Nauchnai͡a shkola "Impulʹsnye prot͡sessy v mekhanike sploshnykh sred" (1st 1994 Nikolaev, Ukraine). Impulʹsnye prot͡sessy v mekhanike sploshnykh sred: Tezysy dokladov I nauchnoĭ shkoly, senti͡abrʹ, 1994. Nikolaev: In-t Impulʹsnykh prot͡sessov i tekhnologii, 1994.

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N, Bagayev S., Chirkin Anatoliĭ Stepanovich, Scientific Council for Coherent and Nonlinear Optics (Rossiīskai͡a︡ akademii͡a︡ nauk., and Society of Photo-optical Instrumentation Engineers., eds. ICONO '95: Atomic and quantum optics : high-precision measurements, 27 June-1 July, 1995, St. Petersburg, Russia. Bellingham, Wash: SPIE, 1996.

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V, Shuvalov Vladimir, Zheltikov Alexei M, Scientific Council for Coherent and Nonlinear Optics (Rossiīskai͡a︡ akademii͡a︡ nauk., and Society of Photo-optical Instrumentation Engineers., eds. ICONO '95: Nonlinear spectroscopy and ultrafast phenomena, 27 June-1 July, 1995, St. Petersburg, Russia. Bellingham, Wash: SPIE, 1996.

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ICONO '95 (1995 Saint Petersburg, Russia). ICONO '95: Nonlinear optics of low-dimensional structures and new materials, 27 June-1 July, 1995, St. Petersburg, Russia. Edited by Emelʹi͡a︡nov V. I, Panchenko Vladislav I͡A︡kovlevich, Scientific Council for Coherent and Nonlinear Optics (Rossiīskai͡a︡ akademii͡a︡ nauk), and Society of Photo-optical Instrumentation Engineers. Bellingham, Wash: SPIE, 1996.

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1952-, Jauho Antti-Pekka, ed. Quantum kinetics in transport and optics of semiconductors. Berlin: Springer, 1996.

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Education, Ontario Ministry of, ed. Can you bear it?: Pulleys, gears, forces, structures and mechanisms. [Ontario]: s.n., 2000.

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Ross, John, Igor Schreiber, and Marcel O. Vlad. Determination of Complex Reaction Mechanisms. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195178685.001.0001.

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In a chemical system with many chemical species several questions can be asked: what species react with other species: in what temporal order: and with what results? These questions have been asked for over one hundred years about simple and complex chemical systems, and the answers constitute the macroscopic reaction mechanism. In Determination of Complex Reaction Mechanisms authors John Ross, Igor Schreiber, and Marcel Vlad present several systematic approaches for obtaining information on the causal connectivity of chemical species, on correlations of chemical species, on the reaction pathway, and on the reaction mechanism. Basic pulse theory is demonstrated and tested in an experiment on glycolysis. In a second approach, measurements on time series of concentrations are used to construct correlation functions and a theory is developed which shows that from these functions information may be inferred on the reaction pathway, the reaction mechanism, and the centers of control in that mechanism. A third approach is based on application of genetic algorithm methods to the study of the evolutionary development of a reaction mechanism, to the attainment given goals in a mechanism, and to the determination of a reaction mechanism and rate coefficients by comparison with experiment. Responses of non-linear systems to pulses or other perturbations are analyzed, and mechanisms of oscillatory reactions are presented in detail. The concluding chapters give an introduction to bioinformatics and statistical methods for determining reaction mechanisms.
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How It Works: Pulleys & Gears (How It Works). Heinemann Educational Books - Library Division, 2000.

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Royston, Angela. How It Works: Pulleys & Gears (How It Works). Heinemann Educational Books - Library Division, 2001.

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Book chapters on the topic "Pulley Mechanisms"

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Berto, L. F., A. C. Michelotti, P. P. Pastorelli, and A. L. F. Ferreira. "Modeling and Simulation of Decoupler Pulley Effects on FEAD Torsional Vibration." In Mechanisms and Machine Science, 505–19. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99270-9_37.

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Liu, Huaxin, Marco Ceccarelli, Qiang Huang, Xinran Guo, Haotian She, and Weimin Zhang. "A Cable-Pulley Transmission for Ankle Joint Actuation in Artificial Leg." In Advances in Reconfigurable Mechanisms and Robots II, 559–70. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23327-7_48.

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Jiang, Qingyuan, Shuang Song, and Wenzeng Zhang. "A Novel Parallel and Self-adaptive Robot Hand with Triple-Shaft Pulley-Belt Mechanisms." In Intelligent Robotics and Applications, 752–63. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65292-4_65.

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Fuss, Franz Konstantin. "Synopsis of Climbing — Pulley Mechanics and Taping." In The Engineering of Sport 6, 233–34. New York, NY: Springer New York, 2006. http://dx.doi.org/10.1007/978-0-387-46051-2_41.

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Chevion, Mordechai, Ben-Zhan Zhu, and Eduard Berenshtein. "The “Push-Pull Mechanism”." In Free Radicals, Oxidative Stress, and Antioxidants, 267–83. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-2907-8_24.

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Donley, M. S., J. S. Zabinski, V. J. Dyhouse, P. J. John, P. T. Murray, and N. T. McDevitt. "Pulsed laser deposition of tribological materials." In Laser Ablation Mechanisms and Applications, 271–79. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/bfb0048381.

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Liu, Yifan, and Wenzeng Zhang. "Hybrid Under-Actuated Robotic Finger with Triple Pulley-Belt Mechanism." In Informatics in Control, Automation and Robotics, 447–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25992-0_62.

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Walton, Eric K., and Michael J. Gerry. "Analysis of Dispersive Radar Scattering Mechanisms from Measured Data." In Ultra-Wideband, Short-Pulse Electromagnetics 2, 543–47. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1394-4_57.

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Bokhan, P. A., and E. I. Molodykh. "Output Limiting Mechanisms and the Prospects for Metal Vapour Lasers with Average Output Power Above 1 kW/m." In Pulsed Metal Vapour Lasers, 137–48. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1669-2_13.

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Eidelman, Shmuel, Xiaolong Yang, and Isaac Lottati. "Pulsed Detonation Engine: Key Issues." In Fluid Mechanics and Its Applications, 203–18. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5432-1_17.

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Conference papers on the topic "Pulley Mechanisms"

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Kagotani, Masanori, and Hiroyuki Ueda. "Transmission Error in Synchronous Belt With Resonance Under Installation Tension." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63296.

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Synchronous belt drives are widely employed to transmit rotation accurately. The belt spans between the driving and driven pulleys generate resonance when the transverse natural frequency of the belt, as in string vibration, matches the meshing frequency of the belt tooth and the pulley tooth. The resonance of the belt spans affects the behavior of the transmission error. In the present study, the mechanisms generating the transmission error in synchronous belt drives under installation tension and a pulley speed ratio of 1:1 are investigated theoretically and experimentally for the case in which the belt spans generate first mode vibration due to resonance. The calculated and experimental transmission errors show good agreement, and so the validity of our analysis is confirmed. The transmission error has a period of 1/2 of one pitch of the pulley, and is generated by the difference in displacement between the upper and lower belt spans, the difference in the amount of belt climbing at the beginning and end of meshing, and the generation of torque due to the moment of inertia on the driven side.
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Gerbert, Göran. "Belt Slip: A Unified Approach." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0042.

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Abstract Slip measurements on thick flat belts, V-belts and V-ribbed belts running on small pulleys reveal that the slip is much higher than can be predicted with classical creep theory. Shear creep plays an important role and special care must be taken when analysing the shear deflection of the V-belt and the ribs of the V-ribbed belt. Other mechanisms are present as well. The behaviour in the seating and unseating regions changes the direction of the frictional forces in these regions on the driver pulley. A unified slip theory is presented for flat belts, V-belts and V-ribbed belts considering creep, shear, seating/ unseating and compliance. Measurements and theory fit very well for practical tension levels. At low tension the measured slip is higher than the predicted one for V-belts and V-ribbed belts, which probably depends on the poor fit between the belt and the grooved pulley.
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Williams, Adam, Wael Saab, and Pinhas Ben-Tzvi. "Analysis of Differential Mechanisms for a Robotic Head Stabilization System." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67371.

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This paper presents a robotic system intended to help automate the head and neck stabilization process performed on trauma patients through application of a differential apparatus, a device that distributes an input between multiple output channels. A system to streamline the head stabilization process can save valuable time in a life and death scenario, as well as play a key role in future work on a mobile stretcher robot. This investigation focuses on finding the most suitable device to accommodate multiple possible head positions while maintaining a steady force in order to provide secure motion restriction. After an initial review of current emergency medical services standards, a comparison of potential differential mechanisms is undertaken. Static analysis as well as dynamic modeling is performed in order to determine the most appropriate mechanisms. An initial prototype design incorporating a differential pulley, the most mechanically advantageous mechanism, is then introduced.
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Lv, Hao, Yuanfei Han, Xiangyun Li, and Liuxian Zhu. "A Fourier Descriptor Approach to Integrated Type and Dimensional Synthesis of Coupled Serial Mechanism for Motion Generation." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97599.

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Abstract Coupled serial mechanism is a class of mechanisms that couple the relative rotation of successive links utilizing gears or cable-pulley systems. They can be used to generate complex end-effector trajectories or motions with a single actuator. With the employment of Fourier descriptors, a novel approach to integrate type synthesis and dimensional synthesis of such mechanisms is proposed in this paper. Through the Fourier analysis of two arbitrary trajectories from the given motion, the simplest trajectory that contains the least number of harmonic components is identified. Then, characteristic information of those harmonics such as their numbers, amplitudes and initial phases are used to determine the topology and dimensions of the corresponding coupled serial mechanism, thus effectively solving the motion synthesis problem of this type of mechanisms. Finally, three examples are given to demonstrate the validity of the proposed method.
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Lahr, Derek F., and Dennis W. Hong. "Contact Stress Reduction Mechanisms for the CAM-Based Infinitely Variable Transmission." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34601.

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The Cam-based Infinitely Variable Transmission (IVT) is a new type of ratcheting IVT based on a three dimensional cam and follower system which provides unique characteristics such as generating specific functional speed ratio outputs including dwells, for a constant velocity input. This paper presents several mechanisms and design approaches used to improve the torque and speed capacity of this unique transmission. A compact, lightweight, and capable differential mechanism based on a cord and pulley system is developed to double the number of followers in contact with the cam at any time, thereby reducing the contact stress between the followers and the cam surface considerably. A kinematic model governing the motion of this differential is developed and a few experimental results from the prototype are presented, showing an overall increase in performance including a smooth output, a wide gear range, and the ability to shift under load. Plans for future improvements to the design, including an inverted external cam mechanism, is also presented along with the expected performance gains.
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Krovi, Venkat, Vijay Kumar, G. K. Ananthasuresh, and Jean-Marc Vezien. "Design and Virtual Prototyping of Rehabilitation Aids." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/dfm-4361.

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Abstract This paper presents a paradigm for virtual prototyping of a class of one-of-a-kind assistive devices that can be customized to the human user. This class consists of passive, articulated mechanical aids for manipulation that are physically coupled to the user. We address the mechanism synthesis, design and optimization and its evaluation in a virtual prototyping environment that consists of a CAD model of the product and a customized model of the human user. In addition, we develop the theory and methodology for designing planar serial chain mechanisms with revolute joints coupled by cable-pulley transmissions. As an illustrative example, we consider the design and prototyping of a customized feeding aid for quadriplegics.
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Krovi, Venkat, G. K. Ananthasuresh, and Vijay Kumar. "Kinetostatic Synthesis of Coupled Serial Chains." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/mech-5977.

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Abstract Single Degree-of-freedom Coupled Serial Chain (SDCSC) mechanisms are a novel class of modular and compact mechanisms with single degree-of-freedom actuation and control. In this paper, the kinetostatic synthesis of SDCSC mechanisms is addressed. Using the principle of virtual work, the static force equilibrium equations are developed for two-link SDCSCs. These are combined with the previously developed kinematic loop-closure equations to solve the kinetostatic precision point synthesis problem. Since the ratios of the angular velocities at the joints are constants by virtue of cable-pulley coupling in SDCSCs, it possible to render the kinetostatic equations linear in terms of the mechanism parameters. As a result, the solution of the precision point synthesis problem of SDCSCs becomes simpler compared to that of the four-bar mechanism. In order to meet additional criteria such as minimizing the maximum torque required over the entire range of motion of the mechanism, an optimization problem is formulated. The free choices in the precision point synthesis are used as variables in the optimal synthesis problem. The paper also addresses how torsional springs at the joints can be utilized to reduce the required input torque in supporting a specified load at the end-effector. Numerical examples are presented to illustrate the precision point and the optimal synthesis of two-link SDCSC mechanism with and without torsional springs at the joints.
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Karadoğan, Ernur, and Brian P. DeJong. "Design of a Spherical Robot With Cable-Actuated Driving Mechanism." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-68540.

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This paper presents the kinematics and dynamics of a spherical robot with a mechanical driving system that consists of four cable-actuated moving masses. Four cable-pulley systems control four tetrahedrally-located movable masses and the robot functions by shifting its center of mass to create rolling torque. The cable actuation decreases overall mass and, therefore, allow for less energy expenditure, as compared to other moving mass mechanisms that translate the masses by powered-screws. Additionally, the design allows the center of mass for the static (spherical shell, electronics, motors etc.) and dynamic mass (moving masses) to be at the geometric center at any given time, therefore has potential for tumbleweeding when needed. The derived equations of motion are verified by means of simulations.
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Challa, Ravi, V. G. Idichandy, C. P. Vendhan, and Solomon Yim. "An Experimental Study on Rigid-Object Water-Entry Impact and Contact Dynamics." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20658.

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The dynamics of a generic rigid water-landing object (WLO) during water impact is presented in this paper. Tests from a range of drop heights were performed in a wave basin using a 1/6th-Froude scale model of a practical prototype using different drop mechanisms to determine the water impact and contact effects. The first experimental case involved dropping the WLO by using a rope and pulley arrangement, while the second case employed an electromagnetic release to drop the object. Hydrodynamic parameters including peak acceleration, touchdown pressure and maximum impact/contact force were measured using the two different drop mechanisms. The WLO was assumed as rigid, so the experimental results could be correlated with von Karman and Wagner closed form solutions and the maximum accelerations predicted are bounded by these classical analytical solutions. The major purpose of this study are to use the experiments to determine trends that occur when the object is dropped from successive heights using different drop mechanisms by varying the entry speed, angle of impact and the weight of the object. The predictions from the experimental results were used for subsequent numerical studies. Results from the drop tests show that the impact acceleration and touchdown pressure increases practically linearly with the increase in the height of the drop and the data provides conditions of drop mechanism that keep impact accelerations under specified limits for the WLO prototype.
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Chen, T. F., and C. K. Sung. "Evaluation of Power Loss of the Rubber V-Belt CVT." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/mech-5815.

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Abstract This paper proposes a systematic method for the evaluation of power loss of rubber V-belt continuously variable transmissions (CVT). By observing the interaction between belt and sheaves, the entire belt may be divided into four regions. They are free span, wedging-in, adhesion, and wedging-out regions. Therefore, each region possesses a distinct motion characteristic. Herein, power loss is categorized into speed and torque losses. Since speed loss contributes less than 4% of the total power loss in most operating conditions, only torque loss is considered. The mechanisms causing torque loss may be attributed to the hysteresis of belt bending, compression and shear, and friction due to radial motion of the belt. These loss mechanisms are studied on the basis of motion characteristics in each region. Parameters for loss mechanisms are then analyzed to identify their contributions to the system efficiency. These parameters include external load, rotating speed and wedge angle of the pulley, speed ratio, pre-tension, and thickness and tooth profile of the belt. In addition, an experimental study is performed for verification of the proposed analytical approach.
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Reports on the topic "Pulley Mechanisms"

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Fujimoto, James G. Mechanisms and Diagnostics of Ultrashort Pulse Laser Ocular Effects. Fort Belvoir, VA: Defense Technical Information Center, September 1994. http://dx.doi.org/10.21236/ada285610.

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Ragalwar, Ketan, William Heard, Brett Williams, Dhanendra Kumar, and Ravi Ranade. On enhancing the mechanical behavior of ultra-high performance concrete through multi-scale fiber reinforcement. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/41940.

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Steel fibers are typically used in ultra-high performance concretes (UHPC) to impart flexural ductility and increase fracture toughness. However, the mechanical properties of the steel fibers are underutilized in UHPC, as evidenced by the fact that most of the steel fibers pull out of a UHPC matrix largely undamaged during tensile or flexural tests. This research aims to improve the bond between steel fibers and a UHPC matrix by using steel wool. The underlying mechanism for fiber-matrix bond improvement is the reinforcement of the matrix tunnel, surrounding the steel fibers, by steel wool. Single fiber pullout tests were performed to quantify the effect of steel wool content in UHPC on the fiber-matrix bond. Microscopic observations of pulled-out fibers were used to investigate the fiber-matrix interface. Compared to the control UHPC mixture with no steel wool, significant improvement in the flexural behavior was observed in the UHPC mixtures with steel wool. Thus, the addition of steel wool in steel fiber-reinforced UHPC provides multi-scale reinforcement that leads to significant improvement in fiber-matrix bond and mechanical properties of UHPC.
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Bude, J., N. Shen, P. Miller, T. Laurence, S. Baxamusa, W. Steele, L. Wong, T. Suratwala, and M. Feit. High Fluence, Multi-pulse Laser Surface Damage: absorbers, mechanisms and mitigation. Office of Scientific and Technical Information (OSTI), November 2014. http://dx.doi.org/10.2172/1179106.

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Ling, Douglas S., Lie Yang, Ronald G. Riechers, and Edward Moshang. Toxic Effects of Lead and Electromagnetic Pulse Energy on Memory Mechanisms. Fort Belvoir, VA: Defense Technical Information Center, August 2012. http://dx.doi.org/10.21236/ada564121.

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Lin, Charles P. Mechanism of Ultrashort Pulse Laser Injury to the RPE (Retinal Pigment Epithelium). Fort Belvoir, VA: Defense Technical Information Center, February 2003. http://dx.doi.org/10.21236/ada417926.

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Leonov, Sergey B. Study of Mechanisms of Filamentary Pulse Electric Discharge Interaction with Gaseous Flow of Nonuniform Composition. Fort Belvoir, VA: Defense Technical Information Center, June 2013. http://dx.doi.org/10.21236/ada581992.

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Lin, Charles P. Study of Short-Pulsed Laser Retinal Injury Mechanisms By Time-Resolved Imaging of Photomechanical Transients in RPE. Fort Belvoir, VA: Defense Technical Information Center, May 2000. http://dx.doi.org/10.21236/ada379774.

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Zinn, B. T., J. I. Jagoda, B. R. Daniel, and T. Bai. Investigation of the mechanism in Rijke pulse combustors with tangential air and fuel injection. Final report. Office of Scientific and Technical Information (OSTI), March 1993. http://dx.doi.org/10.2172/541804.

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Jitpraphai, Thanat, Bradley Burchett, and Mark Costello. A Comparison of Different Guidance Schemes for a Direct Fire Rocket with a Pulse Jet Control Mechanism. Fort Belvoir, VA: Defense Technical Information Center, April 2002. http://dx.doi.org/10.21236/ada401519.

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Zinn, B. T., J. I. Jagoda, B. R. Daniel, and T. Bai. Investigation of the mechanism in RIJKE pulse combustors with tangential air and fuel injection. Progress report, August 1, 1992--January 31, 1993. Office of Scientific and Technical Information (OSTI), February 1993. http://dx.doi.org/10.2172/369697.

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