Browsing by Author "HOELTZEL, DA"

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4-POSITION SYNTHESIS FOR SPATIAL MECHANISMS WITH 2 INDEPENDENT LOOPS
(1994-02-01)
CHIANG, CH
;
YANG, YN
;
CHIENG, WH
;
HOELTZEL, DA
;
機械工程學系
During the practical implementation of four-position guidance synthesis for the spatial mechanisms, many mathematical models for rigid body guidance design are found to be too complicated to solve especially for up to four positions. Our objectives are to uncover simple and analytical ways to synthesize the single degree-of-freedom, two independent loop spatial mechanisms which are capable of four precision positions. Furthermore, prescribed timing is simultaneously considered for some spatial mechanisms.
SYNTHESIS OF THE RSCR MECHANISM FOR 4 PRECISION POSITIONS WITH RELAXED SPECIFICATIONS
(1992-03-01)
CHIANG, CH
;
CHIENG, WH
;
HOELTZEL, DA
;
機械工程學系
;
Department of Mechanical Engineering
The maximum number of precision positions that can be achieved by the RSCR mechanism is known to be three. However, in many practical applications, for example in pick-and-place tasks on an assembly line, four precision positions are usually preferred. That is, the second and third precision positions are used to control the departure and arrival motion of the first and the fourth precision positions through their first derivatives. This paper presents an efficient technique for synthesizing the RSCR spatial mechanism to satisfy a set of two exact precision positions plus two relaxed precision positions, thereby allowing two degrees-of-freedom of variability in the motion specifications.