The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Kinematic synthesis of planar four bar and geared five bar mechanisms with structural constraints
Author:	Al-Smadi, Yahia Mohammad
View Online:	njit-etd2009-001 (xv, 112 pages ~ 5.9 MB pdf)
Department:	Department of Mechanical Engineering
Degree:	Doctor of Philosophy
Program:	Mechanical Engineering
Document Type:	Dissertation
Advisory Committee:	Sodhi, R. S. (Committee chair) Russell, Kevin (Committee member) Koplik, Bernard (Committee member) Ji, Zhiming (Committee member) Das, Sanchoy K. (Committee member)
Date:	2009-01
Keywords:	Mechanism synthesis Mechanism buckling Structural constraints Mechanism torque Mechanism deflection
Availability:	Unrestricted
Abstract:	In motion generation, the objective is to calculate the mechanism parameters required to achieve or approximate a set of prescribed rigid-body positions. This doctoral dissertation study is aimed to integrate the classical kinematic analysis of a planar four-bar and geared five-bar motion generation with three structural design constraints. These constraints consider driving link static torque, deflection of the crank and buckling of the follower for a given rigid-body load or constant external load. This kineto-elastostatic analysis is based on the following assumptions to be considered during the analysis; the crank and the follower are elastic members and the coupler is rigid member, friction in the joints is neglected, link weights are neglected compared to a given rigid-body load or constant external load, the cross sectional properties of a link do not vary, and finally the mechanism is moving in quasi static condition. By incorporating these constraints into conventional planar four-bar and five-bar motion generation models, mechanisms are synthesized to achieve-not only prescribed rigid-body positions-but also satisfy the above mentioned structural constraints for a given rigid-body load or constant external load.