“三线摆”测定不规则物体定轴转动惯量的实验研究

Experimental Study on the Moment of Inertia of an Irregular Object Rotating About a Fixed Axis by the Method of Three-Wire Pendulum

"三线摆"的摆动周期与物体的转动惯量、摆线的长度等因素有关。根据《"三线摆"法测取不规则物体的定轴转动惯量》指导做实验时,每次会得到不同的实验数据,最终得到不同的待测物转动惯量,但无法判断数据的准确性。为解决此问题,重新制定了实验操作及数据记录,由"实验数据表3-2"的JM,η2两项数据,能够确定测试所得数据的准确性。实验过程中,三线摆的两个薄圆盘对待测物转动惯量的实验值有影响,必须减去薄圆盘空载时的转动惯量。

The swing period of three wire pendulum is related to the moment of inertia of the object,the length of the cycloid and other factors. Under the experiment guidance of ‘measure the moment of inertia of an irregular object rotating about a fixed axis by the method of three-wire pendulum’,whenever you do the experiment you will get different experimental data,and finally get different data about the moment of inertia of analytes,but will be unable to determine the accuracy of the data. To solve this problem,this paper reestablishes the experimental operation and data records,and the accuracy of the test data can be determined by the two dataandin the ＂experimental data table3-2＂. During the experiment,the two thin disks of three-wire pendulum have impacts on the experimental value of the moment of inertia of analyte,the moment of inertia when the thin disk is unloaded must be subtracted.