Auxiliary device for moment of inertia measurement

Abstract

The invention discloses an auxiliary device for measuring rotational inertia. The auxiliary device for measuring the rotational inertia comprises a wobble plate, a locating cone, a gripper, an electromagnet and a rotational base, wherein the locating cone is located below the wobble plate and aligned with the center of the wobble plate, the gripper is used for clamping tightly the wobble plate, the electromagnet drives the gripper through a pulling rope, the locating cone is fixed on the rotational base, and the rotational base is located below the gripper. Due to the facts that the wobble plate is clamped and twisted by the gripper, a rotation angle cushion block and a corresponding rotation angle mechanism are designed, so that the wobble plate is rotated a fixed angle only around a center axis, radial wobble is avoided, and repeatability and reliability of operating each time are guaranteed.

Description

technical field [0001] The invention relates to the technical field of measuring the moment of inertia, in particular to an auxiliary device for measuring the moment of inertia. Background technique [0002] The moment of inertia represents the difficulty of changing the rotational state of a rigid body, and its value depends on the shape, mass distribution and position of the rotating shaft of the object. In engineering practice, for rigid bodies with complex shapes and uneven mass distribution, it is difficult to obtain the moment of inertia through theoretical calculation, and experimental methods are usually used to measure it. The three-wire pendulum method has become a common method for measuring the moment of inertia because of its advantages of simple equipment, convenient operation, and high precision. [0003] like figure 1 As shown, the measurement principle is as follows: the relative rotation axis of the object to be measured coincides with the rotation axis o...

AI Technical Summary

Problems solved by technology

[0010] The premise of using the three-line pendulum method is that the pendulum plate must be placed horizontally, otherwise the relative rotation axis of the measured object will be OO 2 Rotary axis OO with wobble plate 1 do not coincide, such as figure 2 As shown, this will lead to an increase in measurement error

Due to the large error in the measurement cycle of manual counting, in order to improve the measurement accuracy, electronic counting is usually used. The existing sensing methods include infrared detection, magnetic field detection, etc., but no matter what the method is, an additional mark needs to be set on the wobble plate objects such as image 3 As shown, this will result in a difference between the actual moment of inertia and the true value

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