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原文传递 N AN EXPERIMENTAL AND ANALYTICAL INVESTIGATION F OF MOWER-THROWN-OBJECT PHENOMENA

题名：	N AN EXPERIMENTAL AND ANALYTICAL INVESTIGATION F OF MOWER-THROWN-OBJECT PHENOMENA
作者：	Rowan E. DaSilva, Kurt M. Marshek, and Srlkanth M. Kannapan
关键词：	mower-thrown objects, discharge velocities, straight blade, pivoted blade, coefficient f of restitution, blade rpm, blade mass
摘要：	This report presents the results of n an analytical and experimental investigation of mower-thrown-object phenomena. A mower-thrown-object analysis was conducted by developing a simple mathematical model to simulate the rotary action of the mower. A computer program that will compute the object velocities when provided with input for the mower and mowing conditions was also used to aid in the analysis of the mower-thrown-object phenomena. The experimental analysis was conducted to test the theoretical model by using a scale size mower model. High speed photography was used to determine the discharge characteristics of the mower-thrown object. The results show that (1) a higher value of the coefficient of restitution increased the velocity of the thrown object, (2) an increase in the blad rpm caused the object velocity to increase proportionally, (3) an increase in the inertia of the blade significantly Increased the object velocities, (4) n an increase in the distance of the point of contact of the object with the blade, from the center of rotation. Increased the object velocities, and (5) the location of the pivot point played a major role inthe object velocity after impact. The comparison of a straight bar blade and a pivoted bar blade (pivot locatedat the mid point) indicated that the pivoted blade construction resulted in approximately 8 28 percent smaller magnitudes for the object velocities.
报告类型：	科技报告