Mass Synthesis for Multiple Balancing Criteria of Complex, Planar Mechanisms
Mass Synthesis for Multiple Balancing Criteria of Complex, Planar Mechanisms
Elliott, John Lane
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5. Adjust the mass parameters of link 23 until this ratio is satisfied. Substitute these mass parameters into Eq. (4.2.5). This procedure was used with great success for four-bars in Ref. [19]. However, in the eight-bar mechanism being considered, the required mass parameters to satisfy this method, when used on the link pairs 12-23, 45-5o and 78-89, caused a ten-fold increase in the kinetic energy of the mechanism and yielded an increased driving torque. It is hypothesized by the writer that t...his mechanism is of such a nature that it is impossible to balance by mass redistribution to significantly reduce the fluctua- tions of kinetic energy and their required torque. The possible explanation is that the input crank is quite small so that all of the system masses appear to be moving simultaneously with the same sinusoidal motion. In light of the above negative results, attempts were made to balance the mechanism for specified values of kinetic energy which were not con- stant but which, if achieved, would reduce the inertia driving torque.
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