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Dissertations / Theses on the topic 'Cam-follower system'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Paradorn, Vasin. "An Impact Model for the Industrial Cam-follower System: Simulation and Experiment." Digital WPI, 2007. https://digitalcommons.wpi.edu/etd-theses/1096.

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"Automatic assembly machines have many cam-driven linkages that provide motion to tooling. Newer machines are typically designed to operate at higher speeds and may need to handle products with small and delicate features that must be assembled precisely every time. In order to design a good tooling mechanism linkage, the dynamic behavior of the components must be considered; this includes both the gross kinematic motion and self-induced vibration motion. Current simulations of cam-follower system dynamics correlate poorly to the actual dynamic behavior because they ignore two events common in these machines: impact and over-travel. A new dynamic model was developed with these events. From this model, an insight into proper design of systems with deliberate impact was developed through computer modeling. To attain more precise representations of these automatic assembly machines, a simplified industrial cam-follower system model was constructed in SolidWorks CAD software. A two-mass, single-degree-of-freedom dynamic model was created in Simulink, a dynamic modeling tool, and validated by comparing to the model results from the cam design program, DYNACAM. After the model was validated, a controlled impact and over-travel mechanism was designed, manufactured, and assembled to a simplified industrial cam-follower system, the Cam Dynamic Test Machine (CDTM). Then, a new three-mass, two-degree-of-freedom dynamic model was created. Once the model was simulated, it was found that the magnitude and the frequency of the vibration, in acceleration comparison, of the dynamic model matched with the experimental results fairly well. The two maximum underestimation errors, which occurred where the two bodies collided, were found to be 119 m/s2 or 45% and 41 m/s2 or 30%. With the exception of these two impacts, the simulated results predicted the output with reasonable accuracy. At the same time, the maximum simulated impact force overestimated the maximum experimental impact force by 2 lbf or 1.3%. By using this three-mass, two-DOF impact model, machine design engineers will be able to simulate and predict the behavior of the assembly machines prior to manufacturing. If the results found through the model are determined to be unsatisfactory, modifications to the design can be made and the simulation rerun until an acceptable design is obtained."
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2

Girardin, Benoit. "Contact stress analysis and fatigue life prediction for a cam-roller follower system." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-09052009-041041/.

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3

Sundar, Sriram. "Impact damping and friction in non-linear mechanical systems with combined rolling-sliding contact." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1386245045.

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4

Belliveau, Kenneth D. "An investigation of incipient jump in industrial cam follower systems." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0819102-183342.

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5

Yamartino, David E. "Modeling, analysis and redesign of cam-follower systems to increase operating speed." Worcester, Mass.: Worcester Polytechnic Institute, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0422104-161532/.

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6

Dawson, Christopher. "Integrated approach to the geometric generation of worm and wheel, and cam and follower systems." Thesis, Brunel University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415034.

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7

Wang, G.-L. "The running-in wear of automotive cam and follower systems used for lubricant testing and development." Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639339.

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The main concern of this thesis was to investigate the running-in wear of automotive cam-follower systems used in the testing of lubricants and to develop wear particle analysis methods using image processing with particular reference to shape determination. Two kinds of cam-follower test rig were used to investigate the behaviour. The initial tests were carried out using a motored Peugeot TU3 cylinder head. The change in surface topography occurring through wear was examined as a basis for establishing an objective method of wear evaluation. The second series of tests was performed using a specially instrumented MIRA cam and tappet test machine. The effects of variations in the initial surface finish and hardness of the cams and followers were evaluated in which the effect of hardness difference between cam and follower and the implications of surface finish variation were highlighted. When compared with previous work, the measurement of the worn surface profiles of followers were similar to those predicted by a specific wear model for the situation where the cam was harder than the follower. Quantitative methods to analyse wear particle shape using image processing were developed. Appropriate image analysis hardware and associated computer software facilities were established to process data and provide quantitative information about particle size and shape, particularly edge detail. Wear particles taken from different sources were analysed. In the MIRA tests, when the cam was harder than the follower, particles generated under two body abrasion conditions exhibited a large aspect ratio and positive skewness, coupled to high kurtosis. This situation was contrasted by the smaller, rounder, rougher edged particles generated in the case where the cam was softer than the follower which exhibited a milder abrasive polishing type wear.
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8

Peng, Huan Ru, and 彭煥儒. "Optimal design of translating roller follower cam system." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/33104179365062402223.

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9

Chen, Li-Shen, and 陳力山. "FOLLOWER MOTION DESIGN IN A VARIABLE-SPEED CAM SYSTEM." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/60437338337246967993.

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10

Yu, Chaio-Ming, and 余兆明. "Servo Controller Design for a variable Speed Cam-Follower System." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/04796189240287232003.

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11

Lin, Wae-Jii, and 林偉智. "Active control on the residual vibration of a cam follower system." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/38922930623097769802.

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碩士
國立臺灣大學
機械工程學系
85
In this thesis, an active control technique by using a solenoid motoris introduced to reduce the residual vibration of a cam follower system,when the speed of cam driver is increasing such that the flexible vibrationof the follower has to be considered. This approach is quite different fromthat of the traditional way of doing cam profile design either by dynamicconsideration or by optimization concept. For this propose, a linear, lumped/distributed-parameter, dynamicmodel is developed to investigate the dynamic response characteristic offollower. This model indicates the vibration of the follower could beexcited by cam profile acceleration and by the axial thrust force. The mainidea of using the solenoid motor as a controller is to produce a counterforce in the follower during the rising period and avoid the residualvibration to occur at the beginning of the dwell period The dynamic response of solenoid motor could be described by twocharacteristic equations. Instead of using finite element method, adifferent method of magnetic field approximation is proposed to predictthe performance of solenoid motor. Finally, by the concept of normalizingcam profile the control signal of solenoid is transformed into a functionof the rotate angle of cam.
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12

Wei, Eing-Jer, and 魏英哲. "The Design and Manufacture of the Spherical Cam-Oscillating Roller-Follower System." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/41728020966853478652.

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博士
國立成功大學
機械工程學系
88
The Spherical Cam-Oscillating Roller-Follower (SCORF) system is a key component widely used in many automated industrial machine systems to convert a continuous rotational motion into a precise intermittent motion. When the component is used in a production system, it performs specific machining operations during intermittent motion period. The indexing mechanism of the SCORF possesses many distinct advantages such as structural simplicity, arbitrary cross transfer angles between input and output axes, high rotation speed, and good indexing accuracy. Since the mechanism was found of high values and great potential in the application to many light industrial automatic equipment, several SCORF-related research programs were conducted in the past in various countries such as United States, Canada and Mexico. By now, some progresses in the development of meshing theory have been made. However, a systematic study on the characterization of transmission errors and the enhancement of system accuracy is still lacking. In view of the aforementioned research needs, this study is geared toward the development of criteria for the production of high precision SCORF systems. A systematic method is presented to study (1) transmission characteristics and error sources including the pattern of linear line contact, curvature interference avoidance, and the relative sliding errors of a cam and a roller; (2) the conditions for dynamic oil film formation and its relation to manufacturability of the SCORF system; (3) kinematic and dynamic error accumulation and flow interaction in a SCORF system; and (4) four basic design criteria that the meshing theory can be used for the design and production of high precision SCORF systems. A basic design method for controlling the error components to reach a given tolerance is also presented.
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13

Pai, Yu-Chung, and 白友中. "The design of periodic speed tracking control for a cam-follower system." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/81836591797325215779.

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14

Phetkong-Steele, Nonglak. "Learning control and repetitive control of a high-speed, non-linear cam follower system /." Diss., 2002. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3048969.

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15

Cheng, Wen-Teng, and 鄭文騰. "Kinematic Synthesis and Analysis of Cam-Follower Systems." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/46240602276214427191.

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