Title: Dimensional synthesis of six-bar Stephenson III mechanism for 12 precision points path generation
Authors: Khalid Nafees; Aas Mohammad
Addresses: Department of Mechanical Engineering, Jamia Millia Islamia, New Delhi 110025, India ' Department of Mechanical Engineering, Jamia Millia Islamia, New Delhi 110025, India
Abstract: The technological advancements require sophisticated manufacturing procedures wherein requirement to design mechanisms that can precisely follow a specified path through a given number of precision points are to be fulfilled. With these objectives, a six-bar Stephenson III linkage mechanism, having one degree of freedom has been dimensionally synthesised for 12 precision points. The complex number dyadic and triadic loop closure equations have been used to synthesise the mechanism for path generation. In this approach, loop closure equations are solved simultaneously for 12 displacement positions of coupler tracing point and 12 orientation positions of various links for which the output link oscillates. The prescribed parameters are displacement vector (δj) and coupler link motion and the designer is not constrained to restrict the remaining orientation angles of links. Finally, a code has been developed in MATLAB to solve these loop closure equations for determination of the dimensional length of each link.
Keywords: link length; loop closure equations; mechanism synthesis; path generation; precision points; six-bar mechanisms; Stephenson III mechanisms; mechanism design.
International Journal of Mechanisms and Robotic Systems, 2016 Vol.3 No.1, pp.80 - 90
Received: 09 Sep 2015
Accepted: 17 Mar 2016
Published online: 17 Jun 2016 *