The elasticity of the follower train and return spring dynamics are incorporated in a general nondimensional analysis for follower jump in force-closed cam mechanisms. The follower train is represented by a lumped single degree-of-freedom model, and the return spring is considered as a continuous element. Knowing the harmonic content of the forcing function, utilization of four-pole parameters enables a straighforward computational procedure to be developed for the determination of jump speed. For a typical case of simple harmonic motion cam, an analytical expression is derived for the minimum preset of return spring to prevent cam-follower separation in terms of four dimensionless parameters; namely, the speed, damping, elasticity and mass factors. The analytical procedure developed is used to study the relative importance of follower train and return spring parameters on the jump phenomenon. Jump characteristics of simple harmonic and cycloidal motions are compared for varying dwell-angles of a dwell-rise-return (D-R-R) cam.


Discretization and Parallel Iterative Schemes for Advection-Diffusion-Reaction Problems
Sivas, Abdullah Ali; Manguoğlu, Murat; Boonkkamp, J. H. M. ten Thije; Anthonissen, M. J. H. (2015-09-18)
Conservation laws of advection-diffusion-reaction (ADR) type are ubiquitous in continuum physics. In this paper we outline discretization of these problems and iterative schemes for the resulting linear system. For discretization we use the finite volume method in combination with the complete flux scheme. The numerical flux is the superposition of a homogeneous flux, corresponding to the advection-diffusion operator, and the inhomogeneous flux, taking into account the effect of the source term (ten Thije B...
design and implementation of a two-axes linear positioning system for rapid prototyping applications
Yazıcıoğlu, Faruk; Söylemez, Erses; Department of Mechanical Engineering (2007)
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 in...
Performance evaluation of piezoelectric sensor/actuator on active vibration control of a smart beam
Şahin, Melin (SAGE Publications, 2011-01-01)
In this paper the performance of a piezoelectric sensor/actuator pair and self-sensing piezoelectric actuator on the investigation of vibration characteristics and active vibration control of a smart beam are presented. The performance of piezoelectric patches on actuation and sensing is evaluated by investigating the vibration characteristics of the smart beam via various excitation mechanisms and transduction systems. For active vibration suppression of the smart beam, robust controllers are designed and ...
Optimal initialization of manipulation dynamics by vorticity model of robot hand preshaping. Part II: Analyses of grasp initialization and its vorticity based optimization
Erkmen, Aydan Müşerref; Tekkaya, E (Wiley, 2000-04-01)
Our work focuses on developing methods of determining the optimal preshape of a robot hand closing onto an object in order to achieve at contact a certain stability and manipulability degree based on kinematic considerations. This purposive closing of a preshaped hand should then be kinematically modelled in such a way that impact force patterns on the object can naturally be deduced from the model and be optimized such that upon contacting the object the desired optimum initial conditions of manipulation a...
New approaches for performance evaluation using data envelopment analysis
Özpeynirci, Nail Özgür; Köksalan, Murat; Department of Industrial Engineering (2004)
Data Envelopment Analysis (DEA) assigns efficiency values to decision making units (DMU) in a given period by comparing the outputs with the inputs. In many applications, inputs and outputs of DMUs are monitored over time. There might be a time lag between the consumption of inputs and production of outputs. We develop approaches that aim to capture the time lag between the outputs and the inputs in assigning the efficiency values to DMUs. We present computational results on randomly generated problems as w...
Citation Formats
S. T. Tümer and Y. S. Ünlüsoy, “NONDIMENSIONAL ANALYSIS OF JUMP PHENOMENON IN FORCE-CLOSED CAM MECHANISMS,” MECHANISM AND MACHINE THEORY, pp. 421–432, 1991, Accessed: 00, 2020. [Online]. Available: