An interactive computer program for force system structural and dimensional synthesis
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"The general design problem being considered in this project is illustrated in figures 1.1 and 1.2, and can be stated as follows: Given: 1) A mechanism (its link geometry and mass properties), 2) Any known externally applied input-output forces or torques, and 3) The mechanism's desired motion-time response (independent pair variable 02 position, speed and acceleration as a function of time.) Find or synthesize: 1) A system (structural configuration) of externally applied force producing devices (elements) such as linear springs, linear dampers, constant torques, and between which links to attach them, and 2) Numerical values of force device parameters and coordinates of their points of attachment to the mechanism to force the mechanism to have the desired motion-time response and input-output forces. This is the Force System Synthesis Problem labeled with the acronym FORSS by Carson [1]*. This acronym will be used in this paper to refer to the force system synthesis problem as previously described. Carson and Haney [2,3] developed an interactive computer program to investigate potential concepts that could be used for FORSS. They discovered several simple-to-use concepts that involve for example: 1) finding the intersections of lines which are perpendicular to selected points on coupler curves, and 2) visually comparing the desired generalized force curves to those produced by possible force systems. The purpose of the work reported in this thesis was to incorporate the techniques which they discovered into an interactive computer program which a designer with minimal theoretical knowledge of FORSS could use to design force systems. The remaining two sections of this introductory chapter contain a discussion of example FORSS problems to illustrate the breadth of applications, and a summary of prior work done by other authors (excluding that of Carson and Haney) to point out the difficulties encountered with the prior techniques and thus the need for the development of the interactive computer program for FORSS. Chapter 2 contains a detailed summary of Carson and Haney's generalizations and techniques which were incorporated into the development of the computer program. The program is discussed in Chapter 3. The acronym ISD-FORSS, Interactive Structural and Dimensional Force System Synthesis, is hereafter used to refer to the program developed in this work. Chapter 4 contains examples of a designers interaction with ISD-FORSS to illustrate the capabilities of the program and how easily a designer with limited theoretical knowledge of FORSS can design with the program."--Introduction.
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