Journal articles: 'Eccentric mechanism'

1

Wang, Yu. "Kinematic Analysis and Optimization Design of an Eccentric Crank Slide-Block Mechanism Based on ADAMS." Advanced Materials Research 189-193 (February 2011): 997–1000. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.997.

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Operating principle and motion characteristics of an eccentric crank slide-block mechanism are analyzed. A virtual prototype model of the eccentric crank slide-block mechanism is set up based on ADAMS,a simulation software. The kinematics analysis of the eccentric crank slide-block mechanism,it is given.Under the premise of meeting the requirements of slide stroke and travel velocity-ratio coefficient, based on ADAMS, each component size of the eccentric crank slide-block mechanism with best pressure angle (α max ) min can be easily obtained. The equations and the calculations can be used in engineering practice.

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Jin, Han, Jing Zhang, and Yuan Yuan Zhang. "Mechanism and Control of Eccentric Wear of Sucker Rod." Applied Mechanics and Materials 528 (February 2014): 232–36. http://dx.doi.org/10.4028/www.scientific.net/amm.528.232.

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The issue of eccentric wear of sucker rod is not only reduce the strength of the sucker rod that results to sucker rod breaking, but also wear out the pipe leading to leakage of tubing, which impact the regular production of the well. This paper aims at the popular issue in-site, analyze the factors such as wellbore deviation, stroke and fluid viscosity, tested the effect of water content, submergence on the eccentric wear by the laboratory experiment. The mechanism of eccentric wear of sucker rod is studied based on the factors impact the deformation under the stress and displacement constraints. An advanced technique is proposed to prevent eccentric wear based on the theory of hydraulic lubrication theory. It can make wedge form gap formed between sucker rod and tubing with the special tools, so that prolong the life of the well.

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Sun, Yi, and Shugen Ma. "A versatile locomotion mechanism for amphibious robots: eccentric paddle mechanism." Advanced Robotics 27, no. 8 (June 2013): 611–25. http://dx.doi.org/10.1080/01691864.2013.763750.

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Sun, Qiu Yan, Dong Chun Zhang, and Xin Kun Zhang. "Improvement of Feeding Mechanism of Printing Machine." Advanced Materials Research 311-313 (August 2011): 1118–23. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.1118.

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It is found that additional dynamic tension triggered by eccentric shaft affects printing paper is obvious by analyzing the relation between tension and eccentric shaft of feeding mechanism in the paper. Using the dual-tensition control system has the advantages of high examination precision, compensating strip's length, reducing additional dynamic effects to the feeding mechanism, ensuring color printing position precision and improving printing quality.

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KOMURA, Hirotaka, Gen ENDO, and Koichi SUZUMORI. "Development of Novel Crank Wheel Mechanism ”Eccentric Crank Rover”." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2016 (2016): 2A2–08a1. http://dx.doi.org/10.1299/jsmermd.2016.2a2-08a1.

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Polushyna, M. V., T. V. Moskalova, and V. F. Hankevich. "Static force analysis of a single toggle jaw crusher." Geo-Technical mechanics, no. 152 (2020): 254–62. http://dx.doi.org/10.15407/geotm2020.152.254.

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There are various recommendations in domestic and foreign literature regarding the law of distribution of the crushing load along the swing plate of jaw crushers: even, linear or nonlinear. The method of load distribution along the swing jaw affects the resultant crushing force, its application point and, therefore, the forces subjected to the jaw crusher links. A feature of a single toggle jaw crusher is the strong force exerted on the eccentric shaft since the crushing forces are directly transferred to the shaft. Therefore, it is important to determine the worst design case in order to calculate the strength of crusher parts. This article represents the static study of the influence of the application point of the crushing force on the forces acting on the eccentric shaft and the toggle plate of the single toggle jaw crusher. During the study, a kinematic scheme of the mechanism of the single toggle jaw crusher in the form of a four-link crank mechanism was worked out. The dependences of the angles of the rotation of the link on the angle of the eccentric shaft rotation of the crusher were obtained, which allowed determining the trajectories of different points of the swing jaw and the sections of the moving plate which crushed feeding material during the cycle. Static force analysis of the mechanism of a single toggle jaw crusher was carried out which made it possible to understand the mechanism of torque transmission to the links of crusher, determine the forces acting on the toggle plate and the eccentrics shaft bearings, as well as the shifting of application point position of the resultant crushing force along the swing plate during one stroke. The graphs of dependencies of the forces acting on the eccentric shaft and the toggle plate on the position of application point of the crushing load were built, which made it possible to determine the worst case for calculating the strength of crushers’ joints. It is established that maximum forces subjected to the eccentric shaft and the toggle plate occur when the crushing force is applied to the bottom zone of the moving plate. Such an application corresponds to the nonlinear distribution of the crushing load along the swing jaw.

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Sun, Yi, Siyu Huang, Yang Yang, and Shugen Ma. "1A1-R04 Improved Design of a Prototype Module for a Novel Eccentric Paddle Mechanism." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2013 (2013): _1A1—R04_1—_1A1—R04_4. http://dx.doi.org/10.1299/jsmermd.2013._1a1-r04_1.

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Rodriguez, Alexander, Aleksey Generozov, and Ann-Marie Madigan. "Galactic merger implications for eccentric nuclear discs: a mechanism for disc alignment." Monthly Notices of the Royal Astronomical Society 503, no. 2 (March 3, 2021): 2713–25. http://dx.doi.org/10.1093/mnras/stab552.

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ABSTRACT The nucleus of our nearest, large galactic neighbour, M31, contains an eccentric nuclear disc – a disc of stars on eccentric, apsidally aligned orbits around a supermassive black hole (SMBH). Previous studies of eccentric nuclear discs considered only an isolated disc, and did not study their dynamics under galaxy mergers (particularly a perturbing SMBH). Here, we present the first study of how eccentric discs are affected by a galactic merger. We perform N-body simulations to study the disc under a range of different possible SMBH initial conditions. A second SMBH in the disc always disrupts it, but more distant SMBHs can shut off differential precession and stabilize the disc. This results in a more aligned disc, nearly uniform eccentricity profile, and suppression of tidal disruption events compared to the isolated disc. We also discuss implications of our work for the presence of a secondary SMBH in M31.

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9

Yao, Wu-Sung. "Modeling and stabilization of eccentric gravity machinery." Advances in Mechanical Engineering 10, no. 1 (January 2018): 168781401775178. http://dx.doi.org/10.1177/1687814017751782.

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In general, eccentric gravity machinery is a rotation mechanism with eccentric pendulum mechanism, which can be used to convert continuously kinetic energy generated by gravity energy to electric energy. However, a stable rotated velocity of the eccentric gravity machinery is difficult to be achieved only using gravity energy. In this article, a stable velocity control system applied to eccentric gravity machinery is proposed. The dynamic characteristic of eccentric gravity machinery is analyzed and its mathematical model is established, which is used to design the controller. A stable running velocity of the eccentric gravity machinery can be operated by the controlled servomotor. Due to disturbances being periodic, repetitive controller is installed to velocity control loop. The stability performance and control performance of the repetitive control system are discussed. The iterative algorithm of the repetitive control is executed by a digital signal processor TI TMS320C32 floating-point processor. Simulated and experimental results are reported to verify the performance of the proposed eccentric gravity machinery control system.

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Morimitsu, T., H. Sakata, and T. Tsujimura. "Driving Mechanism for Vibrating Bristled Vehicle for Small Pipe." Journal of Engineering for Industry 110, no. 1 (February 1, 1988): 86–91. http://dx.doi.org/10.1115/1.3187848.

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A novel vibrating bristled vehicle for small pipes is proposed. Its drive mechanism with rotating eccentric weight is simulated and analyzed. The investigation shows that the vibrating bristled vehicle can move smoothly through the pipe. The motion experiments and simulations are conducted using a vehicle with 16 bristles in order to clarify the relationship between the vehicle velocity and the angular velocity of the rotating eccentric weight. The calculated vehicle velocity agrees with the experiments.

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Lithwick, Yoram, and Smadar Naoz. "THE ECCENTRIC KOZAI MECHANISM FOR A TEST PARTICLE." Astrophysical Journal 742, no. 2 (November 11, 2011): 94. http://dx.doi.org/10.1088/0004-637x/742/2/94.

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Vladimir Metrikin, S., A. Leonid Igumnov, and V. Irina Nikiforova. "The dynamics of eccentric vibration mechanism (Part 1)." Journal of Vibroengineering 19, no. 7 (November 15, 2017): 4854–65. http://dx.doi.org/10.21595/jve.2017.18346.

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13

Feng, Ding, Jia Wei Wang, Hong Zhang, Peng Wang, and Xu Hui Liu. "Research on Measurement and Control System of Eccentric Mechanism Based on the Well Trajectory Control Tool." Applied Mechanics and Materials 318 (May 2013): 158–61. http://dx.doi.org/10.4028/www.scientific.net/amm.318.158.

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Eccentric mechanism is the core of the high deflecting well trajectory control tools, the control and measurement accuracy of the eccentric mechanism decides the accuracy of the whole tool. In this paper, on the basis of the eccentric mechanism’s principle, developed a set of method and apparatus to measure the space location of the internal and external eccentric ring and control the rotation angle by using Hall sensors and electromagnetic clutch device, so that could measure and control the bending direction and offset size accurately. Additionally, the paper analyzed Underground-Ground interactive communication interface and encoding rules, completing a real-time monitoring closed loop drilling system.

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Du, Xiaoqiang, Kaizhan Chen, Zenghong Ma, Chuanyu Wu, and Guofeng Zhang. "Design, Construction, and Evaluation of a Three-Dimensional Vibratory Harvester for Tree Fruit." Applied Engineering in Agriculture 36, no. 2 (2020): 221–31. http://dx.doi.org/10.13031/aea.13478.

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HighlightsThree-dimensional excitation response of tree can be generated by orthogonal eccentric blocks.The three-dimensional vibratory harvester prototype was built, and the vibration response and harvesting test were carried out.Three-dimensional excitation applied to single main branch of the tree can result in high vibration on the whole tree. Abstract. To solve the problems associated with the mechanical harvesting of fruit, improve the harvesting efficiency, and reduce the damage to trees in the process of harvesting, a three-dimensional shaking mechanism with orthogonal eccentric blocks was designed. Three-dimensional excitation is generated to ensure that the fruit trees are subjected to noncircular excitation forces in different directions and further improve the fruit harvesting percentage. Firstly, the overall structure of the three-dimensional shaking mechanism with orthogonal eccentric blocks was designed, and the steady state response of the vibration system was obtained by establishing the dynamics model of the shaking mechanism-tree system. According to the vibration amplitude of the fruit tree under the action of three-dimensional shaking mechanism, the mass moment of the eccentric blocks, which are the key parts of the harvester, was determined to be 0.56 kg·m, and the size of the eccentric blocks was calculated. The hydraulic motors and cylinders that drive the shaking mechanism of the harvester were specified. Then a vibratory harvester prototype was assembled, and a vibration response test was carried out. The results showed that different branches of the test tree could obtain large acceleration magnitudes with low dispersion degree, which verified the effectiveness of the three-dimensional vibratory harvester. Finally, a harvesting test was conducted on a grapefruit tree. When the speed of the hydraulic motor to drive the shaking mechanism was 470 rev·min-1 and the shaking time was 10 s, the harvesting percentage reached 76.5%. Keywords: Acceleration response, Fruit harvester, Hydraulic system, Orthogonal eccentric blocks, Three-dimensional shaking mechanism.

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15

Cai, Fang, Jian Qing Zhang, and Xiu Feng Ma. "Dynamic Response of Eccentric Swinging Sheet Transfer Mechanism with Kinematic Pair Clearances." Applied Mechanics and Materials 312 (February 2013): 182–85. http://dx.doi.org/10.4028/www.scientific.net/amm.312.182.

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To research the influence of kinematic pair clearances on the dynamic performance of eccentric swinging sheet transfer mechanism used in Sheet-fed offset J2108, a dynamic model was established based on the clearances characteristics and the continuous contact hypothesis. Consequently, the dynamic characteristics of sheet transfer mechanisms output can be researched quantitatively. The results indicate that sheet transfer mechanisms dynamic response appears strong nonlinear characteristics while considering kinematic pair clearances, which seriously affects the sheet transfer mechanisms stability and precision. Therefore, the study on the nonlinear dynamic response of sheet transfer mechanism can provide foundation to improve the stability.

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16

Herzog, W., G. Schappacher, M. DuVall, T. R. Leonard, and J. A. Herzog. "Residual Force Enhancement Following Eccentric Contractions: A New Mechanism Involving Titin." Physiology 31, no. 4 (July 2016): 300–312. http://dx.doi.org/10.1152/physiol.00049.2014.

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Eccentric muscle properties are not well characterized by the current paradigm of the molecular mechanism of contraction: the cross-bridge theory. Findings of force contributions by passive structural elements a decade ago paved the way for a new theory. Here, we present experimental evidence and theoretical support for the idea that the structural protein titin contributes to active force production, thereby explaining many of the unresolved properties of eccentric muscle contraction.

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Vogt, Michael, and Hans H. Hoppeler. "Eccentric exercise: mechanisms and effects when used as training regime or training adjunct." Journal of Applied Physiology 116, no. 11 (June 1, 2014): 1446–54. http://dx.doi.org/10.1152/japplphysiol.00146.2013.

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The aim of the current review is to discuss applications and mechanism of eccentric exercise in training regimes of competitive sports. Eccentric muscle work is important in most sports. Eccentric muscle contractions enhance the performance during the concentric phase of stretch-shortening cycles, which is important in disciplines like sprinting, jumping, throwing, and running. Muscles activated during lengthening movements can also function as shock absorbers, to decelerate during landing tasks or to precisely deal with high external loading in sports like alpine skiing. The few studies available on trained subjects reveal that eccentric training can further enhance maximal muscle strength and power. It can further optimize muscle length for maximal tension development at a greater degree of extension, and has potential to improve muscle coordination during eccentric tasks. In skeletal muscles, these functional adaptations are based on increases in muscle mass, fascicle length, number of sarcomeres, and cross-sectional area of type II fibers. Identified modalities for eccentric loading in athletic populations involve classical isotonic exercises, accentuated jumping exercises, eccentric overloading exercises, and eccentric cycle ergometry. We conclude that eccentric exercise offers a promising training modality to enhance performance and to prevent injuries in athletes. However, further research is necessary to better understand how the neuromuscular system adapts to eccentric loading in athletes.

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Luo, You Xin, Heng Shu Li, Hui Jun Wen, and Yu Zhou. "The Research of Drill Propulsion Mechanism with Eccentric Wheel Handspike Roller Movable Inner Gear Profile Curve Shaped-Connection." Applied Mechanics and Materials 152-154 (January 2012): 1397–400. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.1397.

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This paper deals with the existing propulsion mechanism, analyzes the disadvantages of the flat key and the spline, studies the features of the eccentric wheel handspike roller movable inner gear profile curve shaped-connection. In an existing chain propulsion mechanism, we change the fit of the inner hole of sprocket gear and the outer circle of intermediate shaft to get a eccentric wheel handspike roller movable inner gear profile curve shaped-connection (a keyless joint), then introduce the propulsion mechanism with eccentric wheel handspike roller movable inner gear profile curve shaped-connection. At last, we create the three-dimensional modeling of the propulsion mechanism, which would lay a solid foundation for the further study. This new propulsion mechanism has such advantages as self-centralizing, easy disassembly, low stress concentration, with a simple fit cross-section, transmitting big torque, suitable for the heavy loads of rock drilling.

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SUN, Yi, and Shugen MA. "1P1-B08 Kinematics and Dynamics Modeling of the Planetary Gear Transmission in An Eccentric Paddle Mechanism(Smart Mechanism "sMechanism" and its Control)." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2014 (2014): _1P1—B08_1—_1P1—B08_4. http://dx.doi.org/10.1299/jsmermd.2014._1p1-b08_1.

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Perju, Dan, Erwin Christian Lovasz, Karl Heinz Modler, Cristian Moldovan, and Iosif Carabas. "Kinematic Analysis of a Belt Mechanism with a Circular Eccentric Output Element." Applied Mechanics and Materials 162 (March 2012): 11–18. http://dx.doi.org/10.4028/www.scientific.net/amm.162.11.

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The paper proposes two methods for kinematic analysis of a belt mechanism with circular eccentric output element (link). One of them is based on the mechanisms geometry and the second on its kinematics in order to obtain the transmission functions of different order. Both approaches are based on a imaginary cam mechanism instantaneous isokinetic with the given belt mechanism. The transmission functions obtained by means of proposed procedures are in a numerical form due to the finite incremental method used in solving the problem.

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Zhao, Man, Chao Li, Shu Rong Yu, and Yang Yu. "Effect of Radial Compliance Mechanism on Rotor System and Bearing Load for Scroll Compressor." Advanced Materials Research 614-615 (December 2012): 600–603. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.600.

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The imbalance caused by eccentric sleeve radial compliance mechanism rotor system is a main issue in scroll compressor. In this study, the mechanical model of the structure with the eccentric sleeve behind the orbiting scroll is established, the offset level of the main and second balance weight inertia force action line and inertia force action line of the eccentric weight, as well as the effect of this deviation on the second balance and the main and second bearing loads were investigated in terms of working principle, structure and loading. The results show that the structure has great influence on scroll compressor rotor system balance in reducing orbiting radius regulation. It is suggested that the correlated parameters should be optimized in designing radial compliance mechanism structure.

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Xie, Li Jun. "Kinematics and Dynamics Analysis of Eccentric Circle Cam Mechanism." Advanced Materials Research 821-822 (September 2013): 1466–69. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.1466.

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Geometric methods and mechanical principles were employed to study the kinematic variables and dynamic variables of eccentric circle cam mechanism, and their formulae were also given. The deductions show that the linear velocity and the acceleration of the driven member and the driving moment are all functions of the rotation angleand the rotation angular velocity of the cam, the numerical results of the given example verify the conclusions.

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Su, Li Ya. "Kinematics Analysis of the Eccentric Swing Paper Transfer Mechanism." Advanced Materials Research 734-737 (August 2013): 2717–20. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2717.

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The paper transfer mechanism is an important component of the offset presses, which weightily affects the paper transfer, handover and the print quality of the offset presses. The paper analyzed motor process of the eccentric swing paper transfer mechanism with J2108; introduced the motion law of cam follower lever with the driving paper transfer mechanism by complex vector Analytical method; Draw the angular displacement and time diagram, the angular velocity and time diagram and the Angular acceleration and time diagram with follower lever.

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24

Naoz, Smadar, Gongjie Li, Macarena Zanardi, Gonzalo Carlos de Elía, and Romina P. Di Sisto. "The Eccentric Kozai–Lidov Mechanism for Outer Test Particle." Astronomical Journal 154, no. 1 (June 20, 2017): 18. http://dx.doi.org/10.3847/1538-3881/aa6fb0.

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Yang, Yuhu, Jianyong Wang, Shicai Zhou, and Tian Huang. "Design of a novel coaxial eccentric indexing cam mechanism." Mechanism and Machine Theory 132 (February 2019): 1–12. http://dx.doi.org/10.1016/j.mechmachtheory.2018.10.012.

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Li, Gongjie, Smadar Naoz, Matt Holman, and Abraham Loeb. "CHAOS IN THE TEST PARTICLE ECCENTRIC KOZAI-LIDOV MECHANISM." Astrophysical Journal 791, no. 2 (July 30, 2014): 86. http://dx.doi.org/10.1088/0004-637x/791/2/86.

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Zhihong, Sun, Tang Tianxin, Zhao Bocheng, and Chen Yanting. "Study on the coiler drive mechanism of the capacity increasing function." Textile Research Journal 88, no. 3 (November 13, 2016): 312–21. http://dx.doi.org/10.1177/0040517516679150.

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In textile factories, the sliver can is used to deposit and transport sliver in the process of carding, combing and drawing. Increasing the capacity of the sliver can will reduce the frequency of changing the sliver can; hence, the working efficiency can be improved. A belt drive mechanism with the driven pulley eccentrically installed was developed in this study. This mechanism was used as the driving mechanism of the coiler, which has the effect of increasing the capacity of the sliver can. In this study, several commonly used methods of increasing the capacity of the sliver can were introduced first. Then, the equation of motion of the eccentric belt drive mechanism was established, and the law of motion of the driven eccentric pulley was calculated. Finally, the relationship between the eccentricity ( e) of the driven eccentric pulley and the capacity increment ( δ) of a sliver can was analyzed by utilizing the evaluation indicators of density of per sliver lap. The result indicates that with the increase in the value of eccentricity ( e), the capacity increment ( δ) of a sliver can also increases.

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Herzog, Walter. "Mechanisms of enhanced force production in lengthening (eccentric) muscle contractions." Journal of Applied Physiology 116, no. 11 (June 1, 2014): 1407–17. http://dx.doi.org/10.1152/japplphysiol.00069.2013.

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In contrast to isometric and shortening contractions, many observations made on actively lengthening muscles cannot be readily explained with the sliding filament and cross-bridge theory. Specifically, residual force enhancement, the persistent increase in force following active muscle lengthening, beyond what one would expect based on muscle length, has not been explained satisfactorily. Here, we summarize the experimental evidence on residual force enhancement, critically evaluate proposed mechanisms for the residual force enhancement, and propose a mechanism for residual force enhancement that explains all currently agreed upon experimental observations. The proposed mechanism is based on the engagement of the structural protein titin upon muscle activation and an increase in titin's resistance to active compared with passive stretching. This change in resistance from the passive to the active state is suggested to be based on 1) calcium binding by titin upon activation, 2) binding of titin to actin upon activation, and 3) as a consequence of titin-actin binding—a shift toward stiffer titin segments that are used in active compared with passive muscle elongation. Although there is some experimental evidence for the proposed mechanism, it must be stressed that much of the details proposed here remain unclear and should provide ample research opportunities for scientists in the future. Nevertheless, the proposed mechanism for residual force enhancement explains all basic findings in this area of research.

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Debenham, James R., William I. Gibson, Mervyn J. Travers, Amity C. Campbell, and Garry T. Allison. "Modulation of Stretch-Shortening-Cycle Behavior With Eccentric Loading of Triceps Surae: A Possible Therapeutic Mechanism." Journal of Sport Rehabilitation 26, no. 2 (March 2017): 151–58. http://dx.doi.org/10.1123/jsr.2015-0129.

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Context:Eccentric exercises are increasingly being used to treat lower-limb musculoskeletal conditions such as Achilles tendinopathy. Despite widespread clinical application and documented efficacy, mechanisms underpinning clinical benefit remain unclear. Positive adaptations in motor performance are a potential mechanism.Objective:To investigate how an eccentric loading intervention influences measures of stretch-shortening-cycle (SSC) behavior during a hopping task.Design:Within-subjects repeated-measures observational study.Setting:University motion-analysis laboratory.Participants:Healthy adults.Interventions:A single intervention of 5 sets of 10 eccentric plantar-flexion contractions at 6 repetitions maximum using a commercial seated calf-raise machine.Main Outcome Measures:Lower-limb stiffness, sagittal-plane ankle kinematics, and temporal muscle activity of the agonist (soleus) and antagonist (tibialis anterior) muscles, measured during submaximal hopping on a custom-built sledge-jump system.Results:Eccentric loading altered ankle kinematics during submaximal hopping; peak angle shifted to a less dorsiflexed position by 2.9° and ankle angle precontact shifted by 4.4° (P < .001). Lower-limb stiffness increased from 5.9 to 6.8 N/m (P < .001), while surface EMG measures of soleus occurred 14–44% earlier (P < .001) after the loading intervention.Conclusions:These findings suggest that eccentric loading alters SSC behavior in a manner reflective of improved motor performance. Decreased ankle excursion, increased lower-limb stiffness, and alterations in motor control may represent a positive adaptive response to eccentric loading. These findings support the theory that mechanisms underpinning eccentric loading for tendinopathy may in part be due to improved “buffering” of the tendon by the neuromuscular system.

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Wang, Qing Ming, and Jia Chen Ju. "Analysis of the Effect of External Factors to the Propulsion by Inertial Centrifugal Force of Rotating Mechanism." Applied Mechanics and Materials 487 (January 2014): 343–47. http://dx.doi.org/10.4028/www.scientific.net/amm.487.343.

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The idea of inertial propulsion using rotating parts is always attractive, but great controversy also exists. Some researchers even completely negate this idea in principle, they think it would never be possible to create directional movement by the inertial force. Theory and experimental results show that, in certain conditions, directional movement can be realized by the internal inertia force of the device. In this paper, the influence of the friction condition between the propulsion devices which using rotating eccentric mass to generate inertia force and the external supporting surface on the effect of propulsion has been analyzed. The results show that, when there is friction between the device and the supporting surface, the rotary of eccentric mass in the device will allow the device to produce motion in a given direction; if the parameters of propulsion device (eccentric mass and eccentricity) and the rotary speed of the eccentric mass are given, the friction condition between the device and the support surface will affect the characteristics of directional motion.

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Zhang, Fan, Xue Yuan, and Jin Chen. "Mechanical Analysis of Scissor Transmission Mechanism Considering Friction." Applied Mechanics and Materials 419 (October 2013): 74–80. http://dx.doi.org/10.4028/www.scientific.net/amm.419.74.

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Mechanical analysis of scissor transmission mechanism has been of concern for researchers. Analysis methods of kinematic pair frictions effect on efficiency and mechanical properties have been a difficult problem. To solve the problem, a mechanical model has been established for the research on the scissor transmission mechanism considering connecting points kinematic pairfriction. Forcesofnodes of multi-unit transmission mechanism, on the basis of principle of virtual work, were expressed in terms of therecursive matrix. The method used to calculate the efficiency of multi-unittransmission mechanism has been obtained. Analysis on friction factors, including the total number of units, situation of hydraulic cylinder and the eccentric coefficient was carried out with real mechanism and their relationships with efficiency have been expressed by curves. The results indicated that the efficiency decreased with the increase of unit number and the eccentric coefficient. The conclusions obtained could serve as theoretical guidance and reference for mechanical analysis and optimal design on scissor transmission mechanism.

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Li, Juan, Hong Zhi Yang, Mei Han, Jin Chao Xu, Xiao Dong Li, and Xiu Ting Han. "Application and Design of Plunger Pump Lifting Viscoelastic Fluid." Advanced Materials Research 291-294 (July 2011): 2507–11. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2507.

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Daqing Oilfield has more than 10,000 million kilograms of oil through tertiary recovery every year. However, eccentric wear of sucker rod and tubing severely impede the implementation effectiveness and large-scale utilization of tertiary oil production when injecting viscoelastic fluids containing polymer. Therefore, a plunger pump lifting viscoelastic fluid is designed based on the analysis of the mechanism of eccentric wear. The principle to reduce eccentric wear is increasing hydraulic and viscoelastic friction, and expanding clearance. Due to make use of the plunger pump lifting viscoelastic, laboratory experiment and field application have demonstrated effective reduction of eccentric wear, extend the life of the sucker rod and tubing, and improve pump efficiency.

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Daş, Ersin, İsmail İlker Delice, and Murat Keleş. "Analysis and robust position control of an electromechanical control actuation system." Transactions of the Institute of Measurement and Control 42, no. 3 (December 19, 2018): 628–40. http://dx.doi.org/10.1177/0142331218813421.

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This study investigates a modified electromechanical actuator for a guided ammunition fin control system. This modification, which is required due to space limitations, is the use of an eccentric type inverted slider crank mechanism instead of a centric type inverted slider crank mechanism. Brushless DC motor-driven mechanism is modeled experimentally. Using the obtained model, the H∞ type robust position controller is synthesized in the simulation environment and applied to the real system in hardware in the loop tests. The effectiveness of the proposed mechanism and the performance of the synthesized robust position controller are verified by comparing the pre-determined performance requirements and the obtained tests results. It has been shown that for a constant volume, the eccentric type mechanism provides about a 7.6% reduction ratio advantage over the centric type mechanism.

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Pu, Huayan, Chang Liu, Yi Sun, Yang Yang, Jun Zou, Na Liu, Shaorong Xie, Yan Peng, and Jun Luo. "Optimized non-reciprocating legged gait for an eccentric paddle mechanism." Robotics and Autonomous Systems 103 (May 2018): 83–92. http://dx.doi.org/10.1016/j.robot.2018.02.009.

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Li, Shujuan, Ngoc Uyen Nhi Nguyen, Feng Xiao, Ivan Menendez-Montes, Yuji Nakada, Wilson Lek Wen Tan, Chukwuemeka George Anene-Nzelu, et al. "Mechanism of Eccentric Cardiomyocyte Hypertrophy Secondary to Severe Mitral Regurgitation." Circulation 141, no. 22 (June 2, 2020): 1787–99. http://dx.doi.org/10.1161/circulationaha.119.043939.

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Background: Primary valvular heart disease is a prevalent cause of morbidity and mortality in both industrialized and developing countries. Although the primary consequence of valvular heart disease is myocardial dysfunction, treatment of valvular heart diseases centers around valve repair or replacement rather than prevention or reversal of myocardial dysfunction. This is particularly evident in primary mitral regurgitation (MR), which invariably results in eccentric hypertrophy and left ventricular (LV) failure in the absence of timely valve repair or replacement. The mechanism of LV dysfunction in primary severe MR is entirely unknown. Methods: Here, we developed the first mouse model of severe MR. Valvular damage was achieved by severing the mitral valve leaflets and chords with iridectomy scissors, and MR was confirmed by echocardiography. Serial echocardiography was performed to follow up LV morphology and systolic function. Analysis of cardiac tissues was subsequently performed to evaluate valve deformation, cardiomyocyte morphology, LV fibrosis, and cell death. Finally, dysregulated pathways were assessed by RNA-sequencing analysis and immunofluorescence. Results: In the ensuing 15 weeks after the induction of MR, gradual LV dilatation and dysfunction occurred, resulting in severe systolic dysfunction. Further analysis revealed that severe MR resulted in a marked increase in cardiac mass and increased cardiomyocyte length but not width, with electron microscopic evidence of sarcomere disarray and the development of sarcomere disruption. From a mechanistic standpoint, severe MR resulted in activation of multiple components of both the mammalian target of rapamycin and calcineurin pathways. Inhibition of mammalian target of rapamycin signaling preserved sarcomeric structure and prevented LV remodeling and systolic dysfunction. Immunohistochemical analysis uncovered a differential pattern of expression of the cell polarity regulator Crb2 (crumbs homolog 2) along the longitudinal axis of cardiomyocytes and close to the intercalated disks in the MR hearts. Electron microscopy images demonstrated a significant increase in polysome localization in close proximity to the intercalated disks and some areas along the longitudinal axis in the MR hearts. Conclusions: These results indicate that LV dysfunction in response to severe MR is a form of maladaptive eccentric cardiomyocyte hypertrophy and outline the link between cell polarity regulation and spatial localization protein synthesis as a pathway for directional cardiomyocyte growth.

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SHEN, Yayi, Shugen MA, Hiroki TOMITA, Guoteng ZHANG, Yang TIAN, and Atsushi KAKOGAWA. "Development of a Multi-terrestrial Robot with Eccentric Paddle Mechanism." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018 (2018): 2A2—L07. http://dx.doi.org/10.1299/jsmermd.2018.2a2-l07.

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Tsai, Y. T., and K. H. Lin. "Dynamic Analysis and Reliability Evaluation for an Eccentric Speed Reducer Based on Fem." Journal of Mechanics 36, no. 3 (January 17, 2020): 395–403. http://dx.doi.org/10.1017/jmech.2019.52.

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ABSTRACTThis paper reported the designed approaches of cycloidal mechanisms, studied its dynamic forces and failure characteristics using finite element methods (FEM). A simplified cycloidal mechanism (CM) is constructed to fulfill dynamic analysis and reliability evaluation. The studied results show that the loads of the mechanism are shared mainly by a half of the outer rollers and the inner pins. The possible failures of the mechanism will occur at the inner pins caused by the bending stress, and at the cycloid disc induced by the contacting stress. The failure of the inner pins will dominate the damage of the mechanism. A method of evaluating stress variation is proposed for fulfilling reliability design. The stress variations are derived according to the data in dynamic analysis by regression analysis. The methods of design modification are reported for improve the reliabilities. The allowable loads of the CM can be decided accordingly based on the analyzed information.

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Yin, Bi Feng, Jiang Guang He, Yi Xu, and Yong Qiang Li. "The Novel Design of Full-Balancing Mechanism for Single-Cylinder Diesel Engine." Applied Mechanics and Materials 37-38 (November 2010): 1520–24. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.1520.

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One new sliding-block balancing mechanism is proposed for the single-cylinder diesel engine. In the new mechanism, the sliding block is installed against the engine piston. The reciprocation trajectory of sliding block is collinear with the piston trajectory, while sliding block and piston move in the opposite direction, just like two opposite crank connecting rods. The new mechanism includes the crankshaft, connecting rod ring, the slider and the guide components. Through the bearing, connecting rod is installed in the eccentric journal of the crankshaft. The circular connecting rod is in the accurate guiding surface of the slider; and the guide pins are in the guide groove. Guide rod connects with supporting shaft through the guide hole of the slide. The optimized parameters for the sliding block show that the ratio of eccentric distance of the eccentric journal to the length of the connecting rod is equal to the ratio of crank radius to connecting rod length. The appropriate results can balance both the centrifugal inertia force and the reciprocating inertia force generated by piston group. Even the complete balance of the first and second-order reciprocating inertia forces can be obtained, which can reduce the vibration and noise of diesel engine.

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Lau, Wing Yin, Anthony J. Blazevich, Michael J. Newton, Sam Shi Xuan Wu, and Kazunori Nosaka. "Reduced muscle lengthening during eccentric contractions as a mechanism underpinning the repeated-bout effect." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 308, no. 10 (May 15, 2015): R879—R886. http://dx.doi.org/10.1152/ajpregu.00338.2014.

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This study investigated biceps brachii distal myotendinous junction (MTJ) displacement during maximal eccentric elbow flexor contractions to test the hypothesis that muscle length change would be smaller (less MTJ displacement) during the second than the first exercise bout. Ten untrained men performed two eccentric exercise bouts (ECC1 and ECC2) with the same arm consisting of 10 sets of six maximal isokinetic (60°/s) eccentric elbow flexor contractions separated by 4 wk. Biceps brachii distal MTJ displacement was assessed using B-mode ultrasonography, and changes in the displacement (muscle length change) from the start to the end of each contraction during each set and over 10 sets were compared between bouts by two-way repeated-measures ANOVA. Several indirect muscle damage markers were also measured and compared between bouts by two-way repeated-measures ANOVA. The magnitude of MTJ displacement (average of six contractions) increased from set 1 (8.2 ± 4.7 mm) to set 10 (16.4 ± 4.7 mm) during ECC1 ( P < 0.05), but no significant changes over sets were evident during ECC2 ( set 1: 8.5 ± 4.0 mm; set 10: 9.3 ± 3.1 mm). Changes in maximal voluntary isometric contraction strength, range of motion, muscle thickness, ultrasound echo intensity, serum creatine kinase activity, and muscle soreness (visual analog scale) were smaller ( P < 0.05) following ECC2 than ECC1, showing less damage in the repeated bout. These results indicate that the magnitude of muscle lengthening was less during the second than the first eccentric exercise bout, which appears to be a mechanism underpinning the repeated-bout effect.

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Ungureanu, Viorel, Maria Kotełko, and Jan Grudziecki. "Plastic Mechanisms for Thin-Walled Cold-Formed Steel Members in Eccentric Compression." Acta Mechanica et Automatica 10, no. 1 (March 1, 2016): 33–37. http://dx.doi.org/10.1515/ama-2016-0006.

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Abstract The Eurocode 3 concerning thin-walled steel members divides members subjected to compression into four classes, considering their ductility. The representatives of the class C4 are short bars, for which the load-capacity corresponds to the maximum compression stresses less than the yield stress. There are bars prone to local buckling in the elastic range and they do not have a real post-elastic capacity. The failure at ultimate stage of such members, either in compression or bending, always occurs by forming a local plastic mechanism. This fact suggests the possibility to use the local plastic mechanism to characterise the ultimate strength of such members. The present paper is based on previous studies and some latest investigations of the authors, as well as the literature collected data. It represents an attempt to study the plastic mechanisms for members in eccentric compression about minor axis and the evolution of plastic mechanisms, considering several types of lipped channel sections.

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Kalinin, A. V. "Analysis of the Conditions for the Contactless Movement of Eccentric Freewheel Mechanisms." Proceedings of Higher Educational Institutions. Маchine Building, no. 7 (736) (July 2021): 3–9. http://dx.doi.org/10.18698/0536-1044-2021-7-3-9.

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Freewheel mechanisms are used in kinematic chains of technical systems of a various functionality. When such mechanisms freewheeling, it is necessary to ensure that there is no contact of their working elements to reduce friction losses and wear. At the same time, it is necessary to ensure the minimum value of the idling angle affecting the accuracy and response time of the kinematic chain in which the mechanism is installed. The task of analyzing and determining the geometric conditions allowing ensuring a radial gap between the working elements of the eccentric freewheel mechanisms with free-running engagement has been set. To solve this problem, a design scheme is proposed and a mathematical model describing the relationship between the geometrical parameters of the mechanism is obtained. The nature of the influence of the basic geometric parameters (eccentricity, radial clearance, modulus, etc.) on the value of the idling angle is established. It is shown that when designing, the values of the module and the gap should be chosen as the minimum permissible, taking into account the load capacity and the assembly conditions. The eccentricity can be assigned based on the requirements of the manufacturing technology.

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Blaauw, Bert, Lisa Agatea, Luana Toniolo, Marta Canato, Marco Quarta, Kenneth A. Dyar, Daniela Danieli-Betto, Romeo Betto, Stefano Schiaffino, and Carlo Reggiani. "Eccentric contractions lead to myofibrillar dysfunction in muscular dystrophy." Journal of Applied Physiology 108, no. 1 (January 2010): 105–11. http://dx.doi.org/10.1152/japplphysiol.00803.2009.

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It is commonly accepted that skeletal muscles from dystrophin-deficient mdx mice are more susceptible than those from wild-type mice to damage from eccentric contractions. However, the downstream mechanisms involved in this enhanced force drop remain controversial. We studied the reduction of contractile force induced by eccentric contractions elicited in vivo in the gastrocnemius muscle of wild-type mice and three distinct models of muscle dystrophy: mdx, α-sarcoglycan ( Sgca)-null, and collagen 6A1 ( Col6a1)-null mice. In mdx and Sgca-null mice, force decreased 35% compared with 14% in wild-type mice. Drop of force in Col6a1-null mice was comparable to that in wild-type mice. To identify the determinants of the force drop, we measured force generation in permeabilized fibers dissected from gastrocnemius muscle that had been exposed in vivo to eccentric contractions and from the contralateral unstimulated muscle. A force loss in skinned fibers after in vivo eccentric contractions was detectable in fibers from mdx and Sgca-null, but not wild-type and Col6a1-null, mice. The enhanced force reduction in mdx and Sgca-null mice was observed only when eccentric contractions were elicited in vivo, since eccentric contractions elicited in vitro had identical effects in wild-type and dystrophic skinned fibers. These results suggest that 1) the enhanced force loss is due to a myofibrillar impairment that is present in all fibers, and not to individual fiber degeneration, and 2) the mechanism causing the enhanced force reduction is active in vivo and is lost after fiber permeabilization.

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Qu, Bao Zhang, Hong Bo Zhang, Bi Hong Lu, and Zhen Ming Liu. "Research on Brake Shoe Eccentric Wear Mechanism by Analytical Method and Virtual Experiment." Key Engineering Materials 620 (August 2014): 318–23. http://dx.doi.org/10.4028/www.scientific.net/kem.620.318.

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In this paper, a theoretical mechanical model for the brake shoe is set up according to the foundation brake unit of railway freight cars, and it indicates that the friction moment is the origin resulting in brake shoe eccentric wear. On this basis, the pressure distribution formula on the brake shoe is derived when the train brakes in forward and backward direction respectively. The analysis results show that if the wheel and the brake shoe are concentric, the ratio of the revolving-in end pressure to the revolving-out end pressure in wheel forward revolving is larger than that in wheel backward revolving. It is consistent with the phenomena that upper eccentric wear often appears on the brake shoe in practice. Further research reveals that the degree of the eccentric wear is determined by the braking force action style, which is the theoretical basis for the design revision. In addition, the RecurDyn Multi-body Dynamics software is used to build the rigid-flexible coupling dynamics model for the foundation brake unit. The simulation experiment verified the analysis result. The research outcome provides the theoretical basis and technical support for further design improvement of the foundation brake unit in railway freight cars.

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MacIntyre, D. L., W. D. Reid, D. M. Lyster, I. J. Szasz, and D. C. McKenzie. "Presence of WBC, decreased strength, and delayed soreness in muscle after eccentric exercise." Journal of Applied Physiology 80, no. 3 (March 1, 1996): 1006–13. http://dx.doi.org/10.1152/jappl.1996.80.3.1006.

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The purposes of this study were to assess the presence of 99mTc-labeled white blood cells (WBC) in exercised muscle compared with nonexercised muscle over time and to determine the time course of delayed onset muscle soreness (DOMS) and eccentric torque in 10 female subjects. A pretest was followed by 300 eccentric repetitions of the right quadriceps. DOMS and eccentric torque were measured at 2, 4, 20, 24, 48, and 72 h postexercise. Eccentric torque was also tested at 0 h. Radionuclide images of both quadriceps were taken at 2, 4, 20, and 24 h postexercise. The presence of 99mTc-WBC in the exercised muscle was significantly greater (P < 0.001) than in the nonexercised muscle. Eccentric torque declined at 0 and 24 h postexercise. DOMS peaked at 24 h postexercise. The presence of 99mTc-WBC in the exercised muscle in the first 24 h suggests that acute inflammation occurs as a result of exercise-induced muscle injury. The bimodal pattern of eccentric torque supports the hypothesis that more than one mechanism is involved.

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Wang, Ying, Jianneng Chen, Honglian Tao, Dehua Tao, Jian Li, and Jiangjun Yan. "Modeling and analysis of traverse mechanism with eccentric gear and conjugated two-lobed non-circular gear." Textile Research Journal 87, no. 17 (August 26, 2016): 2106–16. http://dx.doi.org/10.1177/0040517516663161.

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The most important performance requirement of a traverse mechanism is that the thickness of the silk package formed by the traverse mechanism is uniform or has little variation in the centre. To realize this requirement and overcome the structural shortcomings of traditional traverse mechanisms, a new kind of traverse mechanism is proposed in this paper. The proposed mechanism is characterized by a non-circular gear drive formed by an eccentric gear and a conjugated two-lobed non-circular gear. Its kinematic model is deduced, together with a calculation model for the formed shape of the silk package cross-section. Both of these models contain the influence caused by the shift motion. Based on these two models, a computer-aided analysis program for the traverse mechanism, using MATLAB, is developed and the influences of the mechanical parameters on the formed shape of the silk package are analyzed. Furthermore, the mechanical parameters based on the new traverse mechanism give a better performance when compared with the traditional mechanism.

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MORGAN, DAVID L., and JASON A. TALBOT. "THE ADDITION OF SARCOMERES IN SERIES IS THE MAIN PROTECTIVE MECHANISM FOLLOWING ECCENTRIC EXERCISE." Journal of Mechanics in Medicine and Biology 02, no. 03n04 (September 2002): 421–31. http://dx.doi.org/10.1142/s0219519402000423.

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Sore muscles following unaccustomed eccentric exercise is a common experience. One remarkable aspect of this is the rapid training. A single bout of exercise can provide significant protection against muscle damage and soreness from subsequent bouts. Several studies have shown that such training also increases the optimum muscle length and/or the number of sarcomeres. The present study aimed to test whether this accounts for all the protection. Rats were trained for up to 30 minutes per day on a treadmill, either inclined to 16° (concentrically biased exercise) or declined to 16° (eccentrically biased exercise) for one week. The decline rats were found to have smaller optimum knee angles, or longer muscle lengths, for torque generation by vastus intermedius muscles than the incline rats. When test eccentric contractions were given over the same range of knee angles for each training group, the decline rats showed less damage. When the differences in the optimum length were accounted for and the eccentric contractions were given over the same portion of the torque angle curve, there was no difference between the two groups in the amount of damage that they suffered, suggesting that the shift in optimum was responsible for all of the protection.

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Webber, Sandra, and Dean Kriellaars. "Neuromuscular factors contributing to in vivo eccentric moment generation." Journal of Applied Physiology 83, no. 1 (July 1, 1997): 40–45. http://dx.doi.org/10.1152/jappl.1997.83.1.40.

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Webber, Sandra, and Dean Kriellaars. Neuromuscular factors contributing to in vivo eccentric moment generation. J. Appl. Physiol. 83(1): 40–45, 1997.—Muscle series elasticity and its contribution to eccentric moment generation was examined in humans. While subjects [male, n = 30; age 26.3 ± 4.8 (SD) yr; body mass 78.8 ± 13.1 kg] performed an isometric contraction of the knee extensors at 60° of knee flexion, a quick stretch was imposed with a 12°-step displacement at 100°/s. The test was performed at 10 isometric activation levels ranging from 1.7 to 95.2% of maximal voluntary contraction (MVC). A strong linear relationship was observed between the peak imposed eccentric moment derived from quick stretch and the isometric activation level ( y = 1.44 x + 7.08; r = 0.99). This increase in the eccentric moment is consistent with an actomyosin-dependent elasticity located in series with the contractile element of muscle. By extrapolating the linear relationship to 100% MVC, the predicted maximum eccentric moment was found to be 151% MVC, consistent with in vitro data. A maximal voluntary, knee extensor strength test was also performed (5–95°, 3 repetitions, ±50, 100, 150, 200, and 250°/s). The predicted maximum eccentric moment was 206% of the angle- and velocity-matched, maximal voluntary eccentric moments. This was attributed to a potent neural regulatory mechanism that limits the recruitment and/or discharge of motor units during maximal voluntary eccentric contractions.

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Xia, Z., J. M. Cholewa, D. Dardevet, T. Huang, Y. Zhao, H. Shang, Y. Yang, et al. "Effects of oat protein supplementation on skeletal muscle damage, inflammation and performance recovery following downhill running in untrained collegiate men." Food & Function 9, no. 9 (2018): 4720–29. http://dx.doi.org/10.1039/c8fo00786a.

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Jacobs, Cale, and Carl Mattacola. "Sex Differences in Eccentric Hip-Abductor Strength and Knee-Joint Kinematics When Landing from a Jump." Journal of Sport Rehabilitation 14, no. 4 (November 2005): 346–55. http://dx.doi.org/10.1123/jsr.14.4.346.

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Context:Decelerating movements such as landing from a jump have been proposed to be a common mechanism of injury to the anterior cruciate ligament (ACL).Objective:To compare eccentric hip-abductor strength and kinematics of landing between men and women when performing a hopping task.Setting:Research laboratory.Patients:18 healthy subjects (10 women, 8 men).Main Outcome Measures:Eccentric peak torque of the hip abductors and peak knee-joint angles during a 350-millisecond interval after impact.Results:No significant sex differences were present, but there was a significant inverse relationship between women's eccentric peak torque and peak knee-valgus angle (r= –.61,P= .03).Conclusions:Women with larger eccentric peak torque demonstrated lower peak knee-valgus angles. By not reaching as large of a valgus angle, there is potentially less stress on the ACL. Increasing eccentric hip-abductor strength might improve knee-joint kinematics during landing from a jump.

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Green, K., A. R. Champneys, and N. J. Lieven. "Bifurcation analysis of an automatic dynamic balancing mechanism for eccentric rotors." Journal of Sound and Vibration 291, no. 3-5 (April 2006): 861–81. http://dx.doi.org/10.1016/j.jsv.2005.06.042.

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Journal articles on the topic 'Eccentric mechanism'

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