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Small impeller mode testing method based on exciting point optimization and vibration measurement with laser

A laser vibration measurement and excitation point technology, used in vibration testing, machine/structural component testing, measuring devices, etc., can solve problems such as low test accuracy, achieve a wide modal measurement range, and display the mode shape results clearly and intuitively. The effect of high natural frequency accuracy

Inactive Publication Date: 2017-04-26
中国船舶重工集团公司第七0五研究所
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Problems solved by technology

[0008] In order to overcome the shortcomings of low test accuracy of existing small impeller modal test methods

Method used

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  • Small impeller mode testing method based on exciting point optimization and vibration measurement with laser
  • Small impeller mode testing method based on exciting point optimization and vibration measurement with laser
  • Small impeller mode testing method based on exciting point optimization and vibration measurement with laser

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Embodiment Construction

[0019] refer to Figure 1-3 . The specific steps of the small impeller modal test method based on excitation point optimization and laser vibration measurement in the present invention are as follows:

[0020] Establish the three-dimensional geometric model of the impeller in the UG modeling software, import it into the ANSYS software for mesh division, material properties, boundary conditions and load settings, establish a finite element model, and calculate the first 5 natural frequencies and mode shapes of the model . Import the mesh division and modal calculation results of the impeller disk model into the vibration and noise correlation analysis module in LMS Virtual. Possibly multiple modal frequencies.

[0021] The impeller modal laser vibration measurement test was carried out under the guidance of the excitation point optimization results. In order to enhance the reflected light intensity of the laser test, reflective paper was pasted on the impeller disk, and a c...

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Abstract

The invention discloses a small impeller mode testing method based on exciting point optimization and vibration measurement with laser. With the method, a technical problem of low testing precision of the existing small impeller mode testing method can be solved. The method is characterized in that an inherent frequency and a vibration mode of an impeller are obtained by finite element stimulation calculation; a mesh division model and a mode calculation result of the impeller are introduced into LMS Virtual.lab software to carry out a preliminary test analysis; and an impeller mode exciting position is selected preferably by using a driving point residue (DPR) method. An impeller is fixed at a support elastically; morphological data of a plate and blades are obtained by using a morphological scanning unit of a laser vibration measurement instrument; and a scanning region is defined at an image directly and point distribution is carried out. With a single-point hammering method, a vibration response signal on the free boundary condition is obtained; the inherent frequency of the impeller is measured; and point-to-point scanning is carried out by using an exciter on the condition of single-frequency shock excitation so as to obtain all-order vibration. Therefore, the testing precision can be improved.

Description

technical field [0001] The invention relates to a small impeller modal test method, in particular to a small impeller modal test method based on excitation point optimization and laser vibration measurement. Background technique [0002] Turbine is one of the important thermal power engines. Since turbine has many unique advantages, the most important of which are simple and reliable structure, high economy, high power of a single machine, and small size and weight. Therefore, no matter in Turbines are widely used on land, in ships and in aviation. [0003] The impeller is a key part of the turbine, which has a great influence on the vibration and noise of the turbine. The mass balance of the turbine disk components, the uneven airflow pulsation of the turbine blades and the aerodynamic noise generated by the high-speed airflow passing through the turbine blades are the main sources of turbine vibration and noise. In order to prevent the turbine impeller from resonating un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02
CPCG01M7/00
Inventor 孙涛刘景云严海赵卫兵
Owner 中国船舶重工集团公司第七0五研究所
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