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Inhomogeneous undersampled blade end timing vibration signal reconstruction method and device

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: 2016-04-06
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a non-uniform under-sampling blade tip timing vibration signal reconstruction method and its device, which solves the problem in the prior art that there is only a method for signal reconstruction for uniformly sampled blade vibration signals question

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  • Inhomogeneous undersampled blade end timing vibration signal reconstruction method and device
  • Inhomogeneous undersampled blade end timing vibration signal reconstruction method and device
  • Inhomogeneous undersampled blade end timing vibration signal reconstruction method and device

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specific Embodiment

[0083] 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.

[0084] (1) Use the blade tip timing vibration measurement system to obtain non-uniform blade tip displacement sampling data.

[0085] see Figure 4 , 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 monitoring head of the fiber optic leaf end timing sensor is set right against the periphery of the blisk 310 . The rotational speed synchronous sensor 210 is arranged on the blisk 310, and the detection head is arr...

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Abstract

The invention provides an inhomogeneous undersampled blade end timing vibration signal reconstruction method and device, and the method comprises the following steps: 1), obtaining inhomogeneous blade end displacement sampling data through employing a blade end timing vibration measurement system; 2), determining the vibration characteristics and frequency band range of a high-speed blade; 3), achieving the interpolation reconstruction of a blade vibration signal based on a periodic inhomogeneous sampling principle. The method causes no deviation and aliasing during signal reconstruction.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of blade vibration signals, in particular to a non-uniform under-sampling blade tip timing vibration signal reconstruction method and a device thereof. 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 th...

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Application Information

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