Date of Award

Summer 1996

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Sebastian Y. Bawab

Committee Member

Gene. J-W. Hou

Committee Member

Jen-Kuang Huang

Call Number for Print

Special Collections; LD4331.E56 T45

Abstract

Four-bar mechanisms are widely used in the industry to solve a variety of motion problems. Till recently, their design was based on fundamental kinematics and brute force techniques, resulting in impractical designs and spurious linkages that failed to perform their desired functions effectively.

Procedures have been developed and implemented to guide the rigid body of crank driven four-bar linkages, through a set of design positions with techniques to avoid their defects. However, the practical applications of linkages used in the industry are coupler driven, with primitive synthesis procedures based on trial and error. The opening and closing of the hood of a car represents a classic example of the coupler driven linkage. This thesis describes a rectified synthesis approach, developed to design coupler driven four-bar mechanisms for motion generation through two and three precision positions. Direct rectification techniques were impossible, and hence an indirect approach was devised to eliminate pertinent defects with the aid of the Robert's linkage. Rectification was achieved by inverting the coupler driven linkages into their crank driven cognates, and transforming their solution to the coupler driven linkages. The procedure was implemented in an interactive linkage synthesis program RECSYN, in the manual and automatic modes. The results for a set of applications were found to be efficient and reliable.

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DOI

10.25777/2zcf-jz23

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