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炮弹、小型导弹和某些非均质不规则构件,用三线摆测其转动惯量较简便。而目前一般采用测量三线摆微振周期然后计算构件转动惯量的方法。但微振周期测量不够准确、不够方便,本文提出大角摆动测量方法。一、结构原理如图1将三条等长L的金属线(摆线)的一端分别悬在与地面平行平面内的三悬点上,三悬点位于半径为r的同心圆上,该三点与圆心的联线夹角互为120°;金属线的另端分别固定在质量为M的摆盘的三吊点上,该三点位于半径为R的同心圆上,它们与其圆心联线也互为120°,圆心在过摆盘质心的中心线上。摆线质量忽略不计。若线摆盘施加水平力矩,则它绕其中心线偏离平衡位置往复摆动,构成三线摆。一般r=R,按需要可r≠R。
Shells, small missiles and some non-homogeneous irregular components, with three-line pendulum its inertia is more simple. At present, the method of measuring the moment of inertia of a three-wire pendulum and then calculating the moment of inertia of the member is generally adopted. However, the measurement of the period of micro-vibration is not accurate enough and not convenient enough. In this paper, the measurement method of large-angle oscillation is proposed. First, the structural principle As shown in Figure 1 will be one of the three equal length L of the metal wire (cycloid) are suspended in the plane parallel to the surface of the three hanging points, the three hanging point is located on a concentric circle radius r, the three And the center of the line with each other angle of 120 °; the other end of the metal wire are fixed to the quality of M wobble plate three hanging points, the three points on the radius R concentric circles, they are connected with the center of the circle 120 ° to each other, the center of the circle in the center of the mass center of the plate. The cycloid quality is negligible. If the line wobbler exerts a horizontal moment, it moves back and forth around its center line off balance position, forming a three-line pendulum. Generally r = R, r ≠ R as needed.