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Undersampled leaf apex timing vibration signal reconstruction method and device thereof

A technology of vibration signals and timing signals, which is applied in measuring devices, instruments, and measuring ultrasonic/sonic/infrasonic waves, etc.

Active Publication Date: 2016-04-20
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and device for reconstructing under-sampled blade tip timing vibration signals. This invention solves the technical problem in the prior art that there is only a method for signal reconstruction for uniformly sampled blade vibration signals.

Method used

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  • Undersampled leaf apex timing vibration signal reconstruction method and device thereof
  • Undersampled leaf apex timing vibration signal reconstruction method and device thereof
  • Undersampled leaf apex timing vibration signal reconstruction method and device thereof

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specific Embodiment

[0066] A method for reconstructing the undersampled blade end timing signal of a high-speed blade according to the present invention will be described below in combination with specific embodiments. take B 0 = f r At this time, at least two sensors are needed to reconstruct the non-uniform sampling signal, and I=2 is taken here. I represents the number of tip timing sensors, other values ​​are used if multiple tip timing sensors are used for sampling. The present invention only protects the situation where 2 tip timing sensors are used.

[0067] (1) Use the blade tip timing vibration measurement system to obtain non-uniform blade tip displacement sampling data.

[0068] see image 3 , is the leaf end timing signal acquisition device in this embodiment. The device is arranged on the casing (not shown in the figure) of the blisk 310 . The leaf disk 310 is centered on the center of the leaf disk 310 and divided into 16 equal parts, and 16 blade numbers 1-16 are set. The mo...

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Abstract

The invention provides an undersampled leaf apex timing vibration signal reconstruction method and a device thereof. The method comprises the steps of (1) acquiring the displacement sampling data of a non-uniform blade end based on a blade end timing vibration measurement system; (2) determining the vibration characteristics of a high-speed blade and the frequency band range of the high-speed blade; (3) based on the periodic non-uniform sampling theory, completing the interpolation reconstruction for the vibration signal of the blade. The vibration displacement is acquired by a first blade end timing sensor and a second blade end timing sensor, wherein the first blade end timing sensor and the second blade end timing sensor are arranged in a casing. Based on the method, reconstructed signals are agonic and non-biased. Meanwhile, only by means of two blade end timing sensors, corresponding data can be acquired. In this way, not only data can be acquired completely and accurately, but also the cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of blade vibration signals, in particular to a method and device for reconstructing under-sampled blade tip timing vibration signals. Background technique [0002] High-cycle fatigue is a common failure of high-speed blades of rotating machines such as gas turbines and aero-engines. It often occurs during the operation of the equipment and causes cracks and breakage of the blades, and even catastrophic accidents. Blade vibration is the direct cause of high cycle fatigue. Especially when the vibration frequency reaches the synchronous vibration which is an integer multiple of the rotation speed period, the synchronous resonance caused by it can continuously increase the vibration amplitude and the stress of the blade, causing huge irreversible damage to the blade. For this reason, on-line monitoring of the vibration generated by rotating blades can effectively avoid the stress distribut...

Claims

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Application Information

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IPC IPC(8): G01H17/00G01H9/00
CPCG01H9/00G01H9/004G01H17/00
Inventor 杨拥民陈仲生胡政林军徐海龙胡海峰官凤娇
Owner NAT UNIV OF DEFENSE TECH
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