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Blade inherent frequency automatic testing system

An automatic testing system and natural frequency technology, applied in vibration testing, machine/structural component testing, measuring devices, etc., can solve problems such as restricting technological development and low testing efficiency, and achieve low technical level requirements, improve technical level and The effect of test efficiency and good application prospects

Inactive Publication Date: 2018-09-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

For the whole blisk, there are multiple blades distributed on it, and the static distance of the displacement sensor needs to be repositioned for each blade test; each blisk is composed of multiple blades, and the excitation point needs to be manually moved after each measurement is completed and measurement points, etc., not only the test efficiency is low, but also requires testers to have a more professional operation level and subsequent data processing capabilities, which greatly restricts the technological development of related industries

Method used

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  • Blade inherent frequency automatic testing system
  • Blade inherent frequency automatic testing system
  • Blade inherent frequency automatic testing system

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Embodiment Construction

[0022] see Figure 1-Figure 8 , The main contents of the present invention include: 1) universal blade clamping and automatic rotation drive mechanism; 2) automatic jet excitation, automatic displacement acquisition and control system; 3) natural frequency automatic test and identification system. in:

[0023] The main features of the universal blade clamping and automatic rotation drive mechanism are that blades of different sizes can be installed and automatic rotation control can be realized. Clamping consists of a base and a rotating disk". The rotating disk is the blisk, which is clamped by the clamping disk, and the stepping motor is used to drive the clamping disk to rotate (thereby driving the rotating disk to rotate), and the stepping motor is composed of The master computer is controlled by maintaining communication with the PLC controller.

[0024] The clamping disc is installed on the rotating disc, and the upper and lower clamping discs adopt a three-claw mechan...

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Abstract

The invention relates to a blade inherent frequency automatic testing system which comprises an external control analysis system, a base, a stepping motor, a rotating disc, a clamping assembly, a laser displacement sensor and a jetting assembly. The stepping motor drives the rotating disc to axially rotate so as to drive the to-be-tested blade to rotate; the jetting end interruptedly injects the gas at equal time to enable the to-be-tested blade to vibrate, and meanwhile, the vibration displacement of the to-be-tested blade is measured through the laser displacement sensor, and the obtained vibration displacement information and the vibration frequency information are transmitted to the external control analysis system, so that the inherent frequency of each order of the to-be-tested bladeis obtained. The middle test process does not need manual intervention, the automation degree is high, the requirement for the technical level of an operator is low, and the testing efficiency is high. The technical level and the testing efficiency of related industries can be greatly improved, and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of vibration testing and relates to an automatic testing system for the natural frequency of blades. The invention combines the non-contact excitation and measurement technology and the automatic spectrum acquisition and analysis technology, and is mainly applied to the natural frequency test and analysis of the blades of the aeroengine, and can also be used for the automatic test of the blades of the gas turbine and blower. Background technique [0002] Blade accident is one of the accidents of steam turbine units, which has a high probability of occurrence and great harm. Statistics show that the vast majority of damage to blades is caused by vibration. Taking an aero-engine as an example, the working conditions of its blades are harsh, and the centrifugal force generated by high-speed rotation and the aerodynamic force brought by the impact of strong airflow can easily cause the blades to vibrate. Engine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02
CPCG01M7/02
Inventor 温晶晶刘承骛吴斌徐丰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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