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Vibration damping test device possessing dry damping structure vane

A damping structure and vibration reduction test technology, which is applied in the direction of machine/structural component testing, measuring devices, vibration testing, etc., can solve problems such as difficult to accurately predict the vibration response of the blade with a dry friction damper and the damping effect of the damper

Inactive Publication Date: 2009-10-28
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong nonlinearity of the contact problem, certain assumptions and simplifications must be used when establishing the contact motion model, making it difficult to accurately predict the vibration response of the blade with a dry friction damper and the vibration reduction of the damper with current theoretical and numerical methods The effect needs to be verified experimentally

Method used

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  • Vibration damping test device possessing dry damping structure vane
  • Vibration damping test device possessing dry damping structure vane
  • Vibration damping test device possessing dry damping structure vane

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Experimental program
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Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] A test device for a blade with a dry friction damping structure of the present invention is composed of a positive pressure loading assembly 1, a clamp assembly 4 and a base 3,

[0046] see figure 2 As shown, the base 3 includes a base frame, an L-shaped left support plate 33, and an L-shaped right support plate 34; the base frame is an integral molding, and the base plate 35 of the base frame has a left support plate 31 and a right support plate 32;

[0047] The left support plate 31 is provided with a plurality of A positioning holes 311, and the A positioning holes 311 are used to install the L-shaped left support plate 33 on the B face 312 of the left support plate 31 through the cooperation of the screw and the nut, and the L-shaped left support plate 31 The support plate 33 is placed opposite to the L-shaped right support plate 34;

[0048]The...

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Abstract

The invention discloses a vibration reduction test device for blades with a dry friction damping structure. The vibration reduction test device is composed of a positive pressure loading assembly, a clamp assembly and a base. The component is installed on the left and right support plates of the base, and the crown of the blade with dry friction damping structure is in contact with the friction blocks A and B on the positive pressure loading component. After loading the initial normal pressure and the loading excitation load, the damping test device of the present invention can be used for different excitation forces, different initial positive pressures, different test pieces (that is, blades with dry friction damping structure) contact angles and different test piece installation positions The vibration characteristics of the friction damping structure are tested, and the test results are used to analyze the influence of important parameters such as the normal pressure of the contact surface of the test piece, the contact angle of the test piece, and the installation position of the test piece on the vibration reduction effect of the friction damping structure.

Description

technical field [0001] The invention relates to a vibration test device, in particular to a vibration reduction test device suitable for a blade with a dry friction damping structure. Background technique [0002] Dry friction damping technology is a very effective vibration reduction method between blades. Practice has proved that using damping nodes to increase structural damping is a very economical and effective method. It can not only weaken the vibration stress of blades, but also increase the blade system. Aeroelastic stability. In an aeroengine, the blade's ability to withstand vibrational stresses due to resonance or flutter is almost entirely dependent on the effect of interfacial dry friction damping. According to the data, 90% of the damping in a composite structure comes from its joints, and the damping characteristics of the joints come from the dry friction between the joints. Due to the insensitivity of dry friction damping to temperature changes, simple st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02
Inventor 洪杰马艳红陈璐璐朱彬杨鑫
Owner BEIHANG UNIV
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