“MKCIRCLES”: An Interactive Computer Graphics Design Tool to Solve the Generalized Three-Precision-Position Synthesis Problem

1994 ◽  
Author(s):  
Pi-Ming Cheng ◽  
Raed N. Rizq ◽  
Arthur G. Erdman
Keyword(s):  
Computer Graphics ◽  
Design Tool ◽  
Synthesis Problem ◽  
Path Generation ◽  
Motion Generation ◽  
Interactive Computer Graphics ◽  
Linkage Design ◽  
Planar Regions ◽  
Angular Displacements ◽  
Position Synthesis

Abstract A new interactive computer graphics program (MKCIRCLES) has been developed to solve the following three-precision-position dyad synthesis tasks: (i) motion generation, (ii) path generation with prescribed timing and (iii) a new solution strategy for (a) motion generation for a user-specified range of the prescribed-timing angular displacements, and (b) path generation with prescribed timing for a user-specified range of the rotations of the floating link. The latter two cases address a problem that is encountered in linkage design; namely, the need to specify limits that certain variables may range through as opposed to specifying fixed values that constrain the design unnecessarily, thus increasing the total number of designs from which to choose. As a result of this new approach, two planar regions, representing all permissible dyad ground-pivot locations and all permissible dyad moving-pivot locations, are identified and plotted. The program uses the properties of the circle-point circles (K1-circles) and the center-point circles (M-circles) throughout the synthesis procedure. MKCIRCLES also allows the designer to define a region in which the ground-pivots are constrained to lie and determine the corresponding moving-pivot region (and vice versa). The program is shown to be a useful design tool and provides greater geometric and kinematic insight into the general three-precision-position synthesis problem.

Six and Seven Position Triad Synthesis Using Continuation Methods

1994 ◽  
Vol 116 (2) ◽  
pp. 660-665 ◽  
Author(s):  
T. Subbian ◽  
D. R. Flugrad
Keyword(s):  
Finite Number ◽  
Continuation Method ◽  
Synthesis Problem ◽  
Continuation Methods ◽  
Path Generation ◽  
Motion Generation ◽  
Number Of Solutions ◽  
Position Synthesis

A continuation method is used for the synthesis of triads for motion generation with prescribed timing applications. The procedure is applied to solve both six and seven position synthesis problems. Triad Burmester curves are generated for the six position synthesis problem and an eight-bar mechanism is designed to illustrate the procedure. For the seven position synthesis problem, a finite number of solutions are obtained. A geared five-bar, seven position path generation example is considered.

A Complex Number Approach for Absolute Precision Position Synthesis for Three Precision Positions

1992 ◽  
Author(s):  
John A. Mirth
Keyword(s):  
Closed Form ◽  
Complex Number ◽  
Closed Form Solution ◽  
Form Solution ◽  
Path Generation ◽  
Motion Generation ◽  
The Absolute ◽  
Position Problem ◽  
Position Synthesis

Abstract Dyads can be synthesized by prescribing the precision point coordinates and the absolute planar orientations of one dyad vector at each of three precision positions. This differs from traditional complex number methods wherein the vector orientations are described relative to one another. Absolute precision position synthesis can be performed for both motion generation, and path generation with prescribed timing. The method presented uses vector loop equations and complex number notation to produce a closed form solution for the three absolute precision position problem. Absolute precision position synthesis is applicable to cases that require specific coupler geometries. The synthesis of flat-folding mechanisms is an example of one such application.

Interactive computer graphics

1988 ◽  
Vol 82 (6) ◽  
pp. 1109
Author(s):  
M. B. Constantian ◽  
George S. Pap
Keyword(s):  
Computer Graphics ◽  
Interactive Computer Graphics

Path Generation for Two Cooperative Puma Robots

1992 ◽  
Author(s):  
Jau-Liang Chen ◽  
Joseph Duffy
Keyword(s):  
Computer Graphics ◽  
Free Path ◽  
Path Generation ◽  
Final Destination ◽  
End Effectors

Abstract This paper describes the development of generating collision-free paths for a pair of cooperative PUMA robots as their end effectors grasp a workpiece in an obstacle-strewn environment. After the initial and goal positions of the wrist center are specified, a collision-free path for this pair of manipulators to move the workpiece safely to the final destination is generated. The algorithm is demonstrated via computer graphics animation on a Silicon Graphics IRIS 4D/70GT workstation.

scholarly journals Caricature Generator: The Dynamic Exaggeration of Faces by Computer

Leonardo ◽  
2007 ◽  
Vol 40 (4) ◽  
pp. 392-400 ◽  
Author(s):  
Susan E. Brennan
Keyword(s):  
Computer Graphics ◽  
Facial Features ◽  
Theory Of Computation ◽  
Human Beings ◽  
Computer Screen ◽  
Interactive Computer Graphics ◽  
Visualization Process ◽  
The Face

The author has researched and developed a theory of computation for caricature and has implemented this theory as an interactive computer graphics program. The Caricature Generator program is used to create caricatures by amplifying the differences between the face to be caricatured and a comparison face. This continuous, parallel amplification of facial features on the computer screen simulates the visualization process in the imagination of the caricaturist. The result is a recognizable, animated caricature, generated by computer and mediated by an individual who may or may not have facility for drawing, but who, like most human beings, is expert at visualizing and recognizing faces.

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