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Rotational inertia measuring method and device

A technology of moment of inertia and test method, applied in the field of mechanical properties, can solve problems affecting test results, unsuitable aircraft, etc., and achieve the effect of short test time and wide application range

Inactive Publication Date: 2014-03-26
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used to solve the problem that the three-wire pendulum test method is prone to two combined movements of rotation and shaking, which will affect the test results, and the problem that it is not applicable to aircraft, etc.

Method used

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  • Rotational inertia measuring method and device

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Embodiment Construction

[0047] Present embodiment is to utilize the testing method of moment of inertia of the present invention to test model airplane, and model airplane weight is 150kg, and length is 2.5m, because of the needs of flight control, now measure the moment of inertia of model airplane around its central axis. Such as figure 1 As shown, the specific steps are as follows:

[0048] 1) Two bearings are provided as fulcrums, and the first and last ends of the aircraft model are installed on the corresponding bearings. The line connecting the centerlines of the two bearings is the rotation axis of the aircraft model.

[0049] The line connecting the centerlines of the two bearings may not be the central axis of the object to be tested, that is, this method can test asymmetric structures.

[0050] 2) Two elastic fulcrums are provided by the spring to assist in supporting the aircraft model. The position of the spring is at the tip of the wing of the aircraft model, and the positions of the t...

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Abstract

The invention discloses a rotational inertia measuring method including the steps of 1), rotationally mounting an object on two fulcrums 2), providing auxiliary supporting to the object by springs; 3), applying force to the object and then releasing the force to enable the object to do torsional vibration; 4), acquiring the natural frequency of the object; 5), setting additional standard mass blocks in sequence and then repeating the step 3) and the step 4) after each setting so as to acquire data; 6), performing linear regression analysis to the data to acquire the rotational inertia of the object. The invention further discloses a rotational inertial measuring device comprising the additional standard mass blocks, a vibration sensor, a data acquisition system and a supporting mechanism, wherein the data acquisition system is connected with the vibration sensor, and the supporting mechanism is used for supporting the object. As the object is rotationally mounted on the two fulcrums to do torsional vibration, the rotational inertia of the object can be acquired rapidly and accurately by means of existing vibration measurement process and the regression analysis. In addition, the object can be of non-symmetrical structure; the rotational inertia measuring method and the rotational inertia measuring device have wide application range.

Description

technical field [0001] The invention relates to the field of mechanical properties, in particular to a testing method and device for a moment of inertia, which is suitable for testing the moment of inertia of an aircraft system, a satellite system, a ship mooring, and the like. Background technique [0002] The moment of inertia (Moment of Inertia) is the measure of the inertia of a rigid body when it rotates around an axis (the characteristic that a rotating object maintains its uniform circular motion or static). The moment of inertia of a rigid body has important physical significance, and it is also an important parameter in scientific experiments, engineering technology, aerospace, electric power, machinery, instrumentation and other industrial fields. The indication system of the electromagnetic system instrument can be used to measure a small current (galvanometer) or electric quantity (impulse galvanometer) respectively due to the difference in the moment of inertia ...

Claims

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Application Information

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IPC IPC(8): G01M1/10
Inventor 罗银淼陶伟明
Owner ZHEJIANG UNIV
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