Abstract
Vibration characteristic of an extended expansion engine which uses a multiple-linkage system was studied. A four-jointed linkage was attached between the connecting rod and the crank pin of a conventional piston-crank system. The end of the linkage rotates a half speed of the crankshaft, resulting in the piston strokes of unequal length in each revolution. The length of the expansion stroke is greater than that of the compression stroke, thereby providing an extended expansion cycle. While this system increases thermal efficiency, complicated motion of the linkage parts make additional inertia force to the whole engine system. Formulating the dynamics of linkage system and applying them to an air-cooled single-cylinder test engine, it was found that the maximum summation of inertia of test engine was 1.94 times as much as of the conventional engine with the same power. Vibration measurement test was executed under no-load firing operation and considerable correlation was achieved between calculation and measurement. As a result, because the test engine moves longer stroke in shorter time, then the acceleration and inertia force becomes larger than that of the conventional engine.
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