A Method for Measuring Static Unbalance of Flexible Hollow Tube Shaft

A technology of static unbalance and hollow tube, which is applied in the field of measurement, can solve the problems that affect the requirements of model equipment, unclear deviation between the center of mass of the tube blank and the center of rotation, and the low pass rate of the tail shaft, so as to solve the problem of production bottleneck and consistency Good, easy to operate effect

Active Publication Date: 2018-11-20
HARBIN DONGAN ENGINE GRP
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  • Description
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AI Technical Summary

Problems solved by technology

[0002] In the flexible helicopter tail shaft system, the initial static unbalance is a unique and very important technical index. Sometimes the newly developed helicopters do not have the calculation method and measurement technology for the initial static unbalance of the tube blank in the early stage of development. The center of mass and the center of rotation deviate from the state, so that the tail drive shaft cannot take measures such as static unbalance correction and compensation in the process of tube billet manufacturing, machining and assembly balance, resulting in an extremely low pass rate of the tail shaft, which seriously affects the demand for model equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A number 216# flexible stern tube blank used for helicopters has a length of 3075mm, an outer diameter of 57mm, and an inner diameter of 50mm. It is required to measure the unbalanced mass and calculate its unbalanced value. The specific The steps are:

[0031] 1. Design and manufacture a water tank with a length of 3500mm and a depth of 80mm;

[0032] 2. Inject water into the water tank, the water depth is 70mm, stuff two blown-up balloons with a diameter of 140mm into the flexible stern tube blank, and then put the flexible stern tube blank shaft into the water tank;

[0033] 3. After the flexible stern shaft blank is stationary, mark the highest point in the middle of the flexible stern tube blank;

[0034] 4. Rotate the flexible stern shaft blank so that the marked point faces down and then release it. After the flexible stern tube blank is stationary, use a marker to mark the highest point in the middle of the flexible stern tube blank. This process is repeated fo...

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Abstract

The invention relates to a method for measuring the unbalance amount of a flexible hollow shaft. According to the principle of minimum potential energy, balance mass is added to the flexible hollow shaft with static unbalance in the opposite direction of the mass eccentricity of the mass of the flexible hollow shaft, the balance mass is weighted when a tube is in the static balance state, and the original static unbalance amount can be calculated by multiplying the balance mass by the distance between the balance mass and the rotation center. According to the method, the static unbalance amount of the flexible hollow shaft can be accurately measured, the principle is simple, and the operation is convenient. After the method is used in practical production, measurement of the static unbalance amount of the flexible hollow shaft is successfully achieved.

Description

technical field [0001] The invention relates to a measuring method, in particular to a method for measuring the static unbalance of a flexible hollow pipe shaft. Background technique [0002] In the flexible helicopter tail shaft system, the initial static unbalance is a unique and very important technical index. Sometimes the newly developed helicopters do not have the calculation method and measurement technology for the initial static unbalance of the tube blank in the early stage of development. The deviation between the center of mass and the center of rotation caused the tail drive shaft to be unable to take measures such as static unbalance correction and compensation during the process of tube billet manufacturing, machining, and assembly balance, resulting in an extremely low pass rate of the tail shaft, which seriously affected the demand for model equipment. Contents of the invention [0003] The object of the present invention is to provide a method for measuri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M1/26
Inventor 王明河梁传宇张振
Owner HARBIN DONGAN ENGINE GRP
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