Measuring cam–follower performance

Naskar, Tarun Kanti; Acharyya, S. K.

doi:10.1016/j.mechmachtheory.2009.12.002

Cited by 14 publications

(3 citation statements)

References 7 publications

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“…For the evaluation of cam mechanism operation, a set of quality criteria have been identified and inventoried [16]: the mechanic operation efficiency, the force multiplying coefficient, the coefficient of stiffness for mechanism parts, the coefficient of friction losses in kinematic couplings, the degree of distancing the mechanism from blockage zones, and the overall dimensions of the mechanism. Naskar and Acharyya [17] conducted extended experimental research for measuring the dynamic response of jerk-optimized, stress-optimized, and size-optimized cams. The method adopted to measure the performance of the cam drive considered the elastic deformation of the cam surface due to induced stresses and established the causes behind the deviations of the theoretical cam displacements from the actual displacements.…”

Section: Introductionmentioning

confidence: 99%

Analytical, Numerical and Experimental Analysis of a Positive Displacement Cam Mechanism—A Case Study

Merticaru

Nagîţ

et al. 2023

Machines

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Cam mechanisms, covering a large structural variety, are widely used in machinery, mainly as components of automated systems. Their functioning behavior is affected by negative dynamic phenomena determined by specific high velocities and acceleration rates. Within the various types of research on the dynamic behavior of cam mechanisms, this study addresses the need to clarify the influence of geometrical parameters and technological conditions on some indicators of the jump phenomenon in contact loss for a cam-follower mechanism. This particularly developed case study referred to a mechanism with a profiled grooved disk cam and oscillating follower. To highlight the influence of the cam-follower contact elasticity on the jump phenomenon, two dynamic models were developed: one considering rigid elements in contact and the second considering elastic cam-follower contact. The models were tested within a virtually simulated experiment, and the numerical simulation results evidenced the influence of input factors like the applied load on the mechanism, the clearance in the cam-follower kinematic pair, and the rotational speed of the cam, and the inertia moment was reduced to the follower on some indicators of the jump phenomenon. Validation FEA and experiments were performed, proving the reliable appropriateness of the dynamic model based on elastic cam-follower contact.

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Section: Introductionmentioning

confidence: 99%

Analytical, Numerical and Experimental Analysis of a Positive Displacement Cam Mechanism—A Case Study

Merticaru

Nagîţ

et al. 2023

Machines

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“…Clearance joints also reduce reliability, stability, kinematic accuracy, and life of the mechanism systems. 3,4 In order to reduce the influence of contact force and friction, except special conditions such as space field, joints in most of mechanism systems are designed to work with lubricant fluid. The hydrodynamic forces include squeeze and wedge effects, which make the journal and the bearing apart, so that even the maximum load occurs in lubricated clearance joint, the journal and bearing will not contact.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of planar multibody system with a lubricated revolute clearance joint using an improved transition force model

Zhang

Liu

2017

Advances in Mechanical Engineering

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The article introduces a general solution for dynamic analysis of a planar multibody system with revolute lubricated clearance joint. An improved transition force model is established, which includes dry contact force and hydrodynamic forces, accounts for not only squeeze-film effects but also wedge-film effects, and is applicable to both long and short bearings. Then, the dynamic behaviors are presented based on this transition force model and a planar slider-crank mechanism with a lubricated revolute clearance joint. Different test conditions are considered in order to present a parametric study about the effects of clearance size, crank speed, and lubricant viscosity on the dynamic characteristics of planar multibody system with lubricated revolute clearance joint. As shown by numerical simulation results, it can be included that with larger clearance size and crank speed, as well as smaller lubricant viscosity, the system has higher vibration amplitude and lower minimum film thickness.

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“…Moreover the fatigue life and microscopic edge cracks for two open-celled foamed polymers having different densities is measured in compression impact using a cam-driven compound pendulum system and observed that the material measurements at constant incident energy included the static compression modulus and peak dynamic stress, which progressively degraded as the number of impacts approached one million, [4]. On the other hand the optimum displacement curve is found for which cam-follower velocity curve, acceleration curve, dynamic response of jerk, pressure angle, induced force and stress of experimental outputs to be continuous and their peak values as small as possible on both the rising and the falling motion of the cam-follower with changing the control points of degree three and six which used in B-spline polynomial by using advanced techniques for data acquisition and data processing, [5,6,7]. A synthesis method is described for designing flexible cam profile of marine engine with just one revolving scan of the profile and analyzed the minimum zone criterion of the form deviation error of disc cam by using smoothing cubic spline curves interpolation for specifying maximum and minimum distance between two curves, [8,9].…”

Section: Introductionmentioning

confidence: 99%

Deflection Estimation of Un-Symmetric Isotropic Cam with Three Circular-Arc Contact Profiles

Yousuf¹

2012

ETJ

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In this paper the principal objectives is to design a suitable profile that produces minimum value of jerk and contact stress keeping the acceleration within a limit especially in high-speed machine. Many works in the experimental part are done on the synthesis of cam profile in accuracy and system flexibility on the output follower motion; but there is a lack in the analytical part. The analytical formulation has been done with classical plate theory of un-symmetric cam with three circular-arc contact profiles using the equation of circular plate solution due to the distributed load comes from the perpendicular contact harmonic motion of the follower. The cam used in the paper can be found in cutting and metal forming tools, heavy duty of marine engine, and fast manufacturing equipment. The aim of the present paper is to calculate the maximum deflection on cam boundaries varying with (r and θ) coordinates between beginning and ending of contact follower loadings. The results were classified into mathematical model and finite element using software ANSYS.

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Measuring cam–follower performance

Cited by 14 publications

References 7 publications

Analytical, Numerical and Experimental Analysis of a Positive Displacement Cam Mechanism—A Case Study

Analytical, Numerical and Experimental Analysis of a Positive Displacement Cam Mechanism—A Case Study

Dynamic analysis of planar multibody system with a lubricated revolute clearance joint using an improved transition force model

Deflection Estimation of Un-Symmetric Isotropic Cam with Three Circular-Arc Contact Profiles

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