Kinematic Synthesis of Four Bar Mechanism using …

N2 - The circuit defect arises when a linkage can not be moved between all precision positions without disassembly. The synthesis of linkages by precision position methods is simplified by reducing the design space to include only those linkages that are free of the circuit defect. Solutions for four-bar and Watt six-bar mechanisms are developed here. Multiple circuits in the Watt six-bar chain arise from circuits within a four-bar chaim of the linkage or from the limits of motion that are imposed on the entire linkage by the two four-bar subchains. The circuit defects that are introduced by these conditions are eliminated through the sequential analysis of the Burmester curves for four-position synthesis. The points on the Burmester curves where the circuit attributes change are found. The curve segments yielding mechanisms that exhibit the circuit defect are then eliminated from consideration. The process is numerical and based on the complex number formulation of Burmester theory.

T2 - A FOUR-BAR SYNTHESIS AND ANALYSIS PACKAGE - PROGRAM UPDATES AND ADDITIONS.

N2 - LINCAGES-4, a four-bar synthesis and analysis software package, has been expanded to include balancing of standard in-line mechanisms. For the given basic dimensions of a Grashof crank-rocker linkage, the parameters of an unbalanced standard in-line mechanism are first calculated. This linkage is then force-balanced with circular counterweights. The root-mean square and maximum dimensionless ratios are calculated for the balanced linkage to optimize shaking moment. A design example is included. LINCAGES-4 runs on the DEC Pro-350 and the IBM PC.


Synthesis of Grashof Four-Bar Mechanisms Using …

T1 - Circuit rectification for four precision position synthesis of four-bar and watt six-bar linkages

AB - LINCAGES-4, a four-bar synthesis and analysis software package, has been expanded to include balancing of standard in-line mechanisms. For the given basic dimensions of a Grashof crank-rocker linkage, the parameters of an unbalanced standard in-line mechanism are first calculated. This linkage is then force-balanced with circular counterweights. The root-mean square and maximum dimensionless ratios are calculated for the balanced linkage to optimize shaking moment. A design example is included. LINCAGES-4 runs on the DEC Pro-350 and the IBM PC.