A three-wire pendulum capable of measuring the moment of inertia of objects not rotating around the center of mass

Abstract

The invention discloses a three-line pendulum capable of measuring the rotational inertia of an object not rotating around the center of mass, and belongs to the technical field of the mechanical experiment instrument. The three-line pendulum comprises a support, an upper disc, a lower disc and three suspension lines. The bottom part of the support is fixedly provided with an internal cylinder. The lower end of the internal cylinder is open, and the upper end is provided with a cylinder cover. The side wall of the internal cylinder is provided with multiple ventilation holes. A gas compressor is connected on the opening of the lower end of the internal cylinder. An external cylinder sleeves outside the internal cylinder. The two ends of the external cylinder are open. The gas compressor pressurizes the gas in the internal cylinder. The gas in the internal cylinder can enter the gap between the internal cylinder and the external cylinder through the ventilation holes and then can be discharged out of the upper open end and the lower open end of the external cylinder. The three-line pendulum is simple in structure and can measure the rotational inertia of the object not rotating around the center of mass and can also measure the rotational inertia of the object rotating around the center of mass, and the three-line pendulum is high in measurement efficiency and great in measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of mechanical experiment instruments, and in particular relates to a three-line pendulum capable of measuring the moment of inertia of an object not revolving around the center of mass. 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 ...

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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, which is not conducive to students' understanding of the moment of inertia

[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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