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Method for measuring rotational inertia and inertia product of small-sized air vehicle

A technology of moment of inertia and aircraft, applied in the field of measurement, can solve problems such as difficult installation and low precision

Active Publication Date: 2014-01-01
BEIHANG UNIV
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Problems solved by technology

It solves the problem that the conventional method is not easy to install or the accuracy is too low

Method used

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  • Method for measuring rotational inertia and inertia product of small-sized air vehicle
  • Method for measuring rotational inertia and inertia product of small-sized air vehicle
  • Method for measuring rotational inertia and inertia product of small-sized air vehicle

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Embodiment Construction

[0047] The invention provides a method for measuring the moment of inertia and the product of inertia of a small aircraft. In order to verify its measurement accuracy and practicability, the following experiments were carried out.

[0048] (1) Verification of the accuracy of the double-line pendulum method

[0049] figure 1 It is a schematic diagram of a two-line pendulum. In order to verify the measurement accuracy of the two-line pendulum method, the regular square tiles were measured and verified. First, the moment of inertia of a rectangular object can be calculated by the following formula

[0050] I = 1 12 m ( a 2 + b 2 ) - - - ( 5 )

[0051] Where m is the mass, a and b are the length and width of the rectangle respectively.

[0052] Experiment 1: Rectangular tiles: m=0.465kg, width b=0.101m, length a=0.298m, the theoretical moment of inertia I is calculated according to formula (5) 0 =0.003836kg·m 2 . Install as image 3 As sh...

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Abstract

The invention provides a method for measuring a rotational inertia and an inertia product of a small-sized air vehicle. According to the method, based on a double-suspension-wire method, the measurement can be finished without accurately measuring a mass center position of the air vehicle in advance; meanwhile, the method has ideal precision and only needs to use simple materials including a thin rope, an adhesive tape, a stopwatch, a slender rod and the like; the complicated measurement of the rotational inertia of the air vehicle can be finished by simple operation. The method comprises the following steps: step 1, mounting the air vehicle and adjusting the balance; step 2, measuring the rotational inertia of a main axis corresponding to three body axes of the air vehicle; and step 3, changing a swinging posture of the air vehicle and solving the inertia product by a formula.

Description

Technical field [0001] The invention relates to a method for measuring the moment of inertia and the product of inertia of a small aircraft, which belongs to the technical field of measurement. Background technique [0002] At present, the moment of inertia of small aircraft can be measured by professional moment of inertia measurement equipment, which is expensive. Secondly, it is measured by experimental methods. The main measurement methods are three-wire pendulum, twist pendulum, compound pendulum and so on. For the three-wire pendulum and torsion pendulum, the accuracy is high but the device is relatively complicated, and it is not easy to install the aircraft, while the accuracy is relatively low for the compound pendulum. Therefore, it is very meaningful and practical to design a simple, convenient, and sufficient accuracy method to measure the moment of inertia and product of inertia of a small aircraft. Summary of the invention [0003] The purpose of the present invent...

Claims

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Application Information

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IPC IPC(8): G01M1/10
Inventor 全权戴训华魏子博王江蔡开元
Owner BEIHANG UNIV
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