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Determination method of fan blade crack position

A technology for fan blades and determination methods, which is applied to the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, special data processing applications, instruments, etc., which can solve the difficulty of increasing equipment maintenance, cannot specifically detect cracks, and cannot effectively avoid blades. Crack economic loss and other problems, to achieve the effect of reducing unplanned production stoppage, fast diagnosis and reliable results

Inactive Publication Date: 2015-01-07
BEIJING UNIV OF TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

The existing blade crack diagnosis methods, whether based on acoustic emission technology or relying on spectrum analysis of the acquired vibration signals, can only diagnose whether there is a crack in the blade, but cannot specifically detect the location of the crack, and cannot effectively avoid blade cracks. The economic losses caused by cracks also increase the difficulty of equipment maintenance

Method used

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  • Determination method of fan blade crack position
  • Determination method of fan blade crack position
  • Determination method of fan blade crack position

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0027] figure 1 It is a flow chart of a method for determining the position of a fan blade crack of the present invention; the method for buying that in this method comprises the following steps:

[0028] S1. Simulate the occurrence of crack faults at different positions of the blade, and calculate the first three natural frequencies;

[0029] S2. Taking the natural frequency of each order, the relative depth of the crack, and the relative radial position of the crack as coordinate axes, draw a natural frequency solution surface diagram, and construct a fault sample library;

[0030] S3. During blade fault diagnosis, obtain the first three natural frequencies of the blade through calculation, and reversely ...

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Abstract

The invention discloses a determination method of a fan blade crack position. The determination method comprises the following steps: S1. simulating crack faults at different positions of a blade and calculating front three-order inherent frequency; S2. drawing an inherent frequency resolving surface diagram by taking the inherent frequency of each order, the relative depth of a crack and the relative radial position of the crack as coordinate axes, and constructing a fault sample library; S3. calculating the front three-order inherent frequency of the blade when the blade is subjected to fault diagnosis, and reversely inputting into the fault sample library; and S4. solving by a contouring method to obtain the depth and the radial position of the crack. According to the method, the position of the crack of the blade can be solved by the contouring method, the fan blade crack can be timely diagnosed, the position of the fan blade crack can be quantitatively analyzed, the diagnosis speed is high and the result is reliable, and therefore, a powerful guarantee is provided for equipment maintenance.

Description

technical field [0001] The invention relates to the technical field of equipment fault diagnosis, and more particularly relates to a method for determining the crack position of a fan blade. Background technique [0002] Fans are widely used in ventilation, dust removal and cooling in factories, mines, tunnels, cooling towers, ships and buildings because of their characteristics of stable wind pressure, large air volume, high efficiency and low noise, providing a basic guarantee for safe production. The fan impeller system is the core component of the fan, and it is responsible for the important task of converting electrical energy into mechanical energy. During the working process, the impeller bears the comprehensive effects of centrifugal force, fluid power, vibration, temperature difference, working medium, etc., and the stress condition is relatively complicated. Especially in actual work, the working environment of the blade is even worse. Not only do they have to go ...

Claims

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Application Information

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IPC IPC(8): G01N29/04G06F19/00
Inventor 付胜高银波
Owner BEIJING UNIV OF TECH
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