a three-wire pendulum

Abstract

The invention discloses a three-line pendulum and belongs to the technical field of mechanical experiment instruments. The three-line pendulum comprises a support, an upper plate, a lower plate, two suspended lines and an anti-leakage magnetic shell and an anti-leakage magnetic cover plate which can relatively rotate, the anti-leakage magnetic shell and the anti-leakage magnetic cover plate are made of permeability magnetic materials, the anti-leakage magnetic cover plate is fixedly mounted on the bottom of the lower plate, and a first connection column is fixedly mounted on the lower surface of the anti-leakage magnetic cover plate; a circle disk is fixedly mounted at the bottom of the first connection column, and multiple internal magnets which are distributed in the peripheral direction are arranged on the outer surface of the circle disk; a cylinder is fixedly mounted on the portion, outside the circle disk, in the anti-leakage magnetic shell, multiple external magnets which are distributed in the peripheral direction are arranged on the inner surface of the cylinder, the external magnets and the internal magnets are correspondingly arranged, and the polarities of the opposite surfaces of the external magnets and the internal magnets are same. The three-line pendulum is simple in structure, can measure the rotational inertia of an object which does not rotate around the mass center, can also measure the rotational inertia of an object which rotates around the mass center, and is high in measurement efficiency and in measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of mechanical experiment instruments, in particular to a three-wire pendulum. Background technique [0002] The three-wire pendulum is a commonly used experimental instrument for measuring the moment of inertia of objects in university physics experiments. The existing three-wire pendulum includes a bracket, an upper plate, a lower plate, and three suspension wires arranged between the upper plate and the lower plate. The disc is used to place the object to be measured, and the moment of inertia of the object to be measured is measured by using the change of the rotation period and mass of the three-wire pendulum before and after the object to be measured is placed. However, the existing three-wire pendulum has the following disadvantages: [0003] 1. The existing three-wire pendulum can only measure the situation when the object rotates around the center of mass, because when the object does not rotate aro...

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Problems solved by technology

[0003] 1. The existing three-wire pendulum can only measure the situation when the object rotates around the center of mass, because when the object does not rotate around the center of mass, the three-wire pendulum will swing laterally, which destroys the conditions for measuring the moment of inertia of the three-wire pendulum, so now Some three-wire pendulums cannot measure the moment of inertia of objects that do not rotate around the center of mass

[0004] 2. Even for the measurement of the moment of inertia of objects rotating around the center of mass, lateral shaking is prone to occur due to various reasons, so you must be very careful when doing experiments, but it is still difficult to completely avoid lateral shaking, which affects the measurement efficiency. also affects the accuracy of the measurement

[0005] 3. When the three-wire pendulum is working, the rotation angle is required to be below 5 degrees. The existing three-wire pendulum does not have a display device for the rotation angle. The size of the rotation angle can be estimated by the experimenter, which is not conducive to controlling the measurement error.

[0006] 4. In the existing three-wire pendulum, the rotation of the lower plate is driven by the upper plate, which is inconvenient to use

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