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A three-dimensional vibration mode adjustable blade vibrator and its design method

A technology of three-dimensional vibration and vibration exciter, which is applied in vibration testing, testing of machine/structural components, measuring devices, etc., can solve problems such as low vibration frequency and single vibration mode, and achieve the effect of avoiding single excitation mode

Active Publication Date: 2019-11-26
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because mechanical excitation often leads to a single vibration mode and a low vibration frequency, it has its limitations.

Method used

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  • A three-dimensional vibration mode adjustable blade vibrator and its design method
  • A three-dimensional vibration mode adjustable blade vibrator and its design method
  • A three-dimensional vibration mode adjustable blade vibrator and its design method

Examples

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Embodiment Construction

[0036] In order to make the purpose of the present invention, technical solutions and advantages clearer, the present invention will be further described in detail below in conjunction with examples. It should be noted that the following examples are only explanations of the present invention and the present invention is not limited to the following examples .

[0037] Such as figure 1 , 2, 3, and 4, the blade vibrator with adjustable three-dimensional vibration mode of the present invention includes a vibrator main body 10, a transmission column 20 and a blade 30, the end of the transmission column 20 is connected with the vibrator main body 10, and the transmission The top of the column 20 is fixedly connected with the blade root of the blade 30 . The exciter main body 10 includes a disc-shaped housing 11, a vibrating disc 12, a power eccentric wheel 13, a rail pin 14, and a ball joint base 15. The top of the disc-shaped housing 11 is provided with a strip-shaped cavity 16...

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PUM

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Abstract

The invention discloses a blade vibration exciter with an adjustable three dimensional vibration mode, and a design method for the blade vibration exciter, and belongs to the technical field of aeroelasticity testing of turbine machines. The key of the invention lies in employing a vibration disc which can adjust the vibration in many directions, and achieving the axial, peripheral and torsional vibration and multi-mode coupling vibration of a connected blade through changing the eccentric position and phase inclined angle of a driving eccentric wheel. The blade vibration exciter can be directly used for the aeroelasticity testing of turbine machines. The reasonable selection of the eccentric distance and phase inclined angle and the change of the vibration amplitude and mode enable a blade to carry out the axial bending, peripheral bending, torsion and coupling modes, so as to restore the vibration state of the blade during low-order vibration.

Description

technical field [0001] The present invention relates to a vibration exciter, in particular to a blade aeroelasticity experiment vibration exciter with adjustable three-dimensional vibration mode. Bending and torsional vibration, through mechanical contact excitation, restores the vibration state of the blade in the low-order mode, especially suitable for the field of aeroelasticity experiments of aviation gas turbine engines. Background technique [0002] The aeroelastic problem is the dynamic coupling between the unsteady aerodynamic force, elastic force and inertial force between the blade and the flow around it, which usually leads to high-frequency vibration of the blade, and the consequence is high-cycle fatigue of the blade. High cycle fatigue caused by aeroelastic problems is an important factor affecting engine safety, operability and readiness. In order to improve engine efficiency and reduce engine size, high-load custom airfoils have been widely used. Small size...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02
CPCG01M7/022
Inventor 董旭张燕峰卢新根韩戈
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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