Aeroengine load spectrum filtering method based on rain-flow counting method

A technology of aero-engine and rain flow counting method, applied in computer parts, calculation, electrical and digital data processing, etc., can solve the problem of incomplete retention of fatigue life prediction affecting load spectrum, etc., and achieve the effect of improving accuracy

Active Publication Date: 2017-02-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0010] The purpose of the present invention is to provide a filtering method based on the rainflow counting method for the load spectrum of an aeroengine, so as to solve the problem that the existing filter...

Method used

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  • Aeroengine load spectrum filtering method based on rain-flow counting method
  • Aeroengine load spectrum filtering method based on rain-flow counting method
  • Aeroengine load spectrum filtering method based on rain-flow counting method

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Embodiment

[0049] A certain type of engine speed spectrum filtering process:

[0050] Such as figure 2 Shown is the rotational speed spectrum of a certain type of aero-engine, the rotational speed spectrum has 5577 sampling points in total, and the sampling frequency is 1HZ. (1) Perform rainflow filtering to obtain the rainflow filtering spectrum. The specific steps are as follows: Through programming, the peak and valley values ​​of the load spectrum are screened out in sequence, a total of 3029 effective values, and the peak and valley values ​​of the speed are as follows: image 3 shown. Then judge whether the rise or fall meets the set threshold value (9.6464) based on the relationship between two adjacent peak and valley points to determine whether each point will stay or not, and judge each point until the last point in turn. Finally, it is judged that the value of the last point (4.069) of the rainflow filter spectrum is the same as that of the first point (4.069), which ensur...

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Abstract

The invention provides an aeroengine load spectrum filtering method based on a rain-flow counting method. The aeroengine load spectrum filtering method comprises steps that (1), rain-flow filtering for original spectrum of aeroengine load spectrum is carried out to acquire rain-flow filtering spectrum; and (2), based on the rain-flow filtering spectrum, points of multiple original load spectrum are added, and the filtering spectrum based on the rain-flow method is lastly acquired. Through the method, the load loading/unloading path information can be reflected, namely, on the basis of deleting small circulation, circulation peak/valley values of the filtering spectrum and the original spectrum are guaranteed to be identical, and the path of the original spectrum is reserved to a maximum degree; singular points can be more effectively eliminated, threshold filtering for signals is carried out to eliminate noise of the signals, and signal processing efficiency is improved. The method is advantaged in that research on flight parameter pre-processing and outlier elimination in an aeroengine load spectrum compilation process is realized.

Description

technical field [0001] The invention belongs to the field of aeroengine load spectrum, in particular to a filtering method of aeroengine load spectrum based on rainflow counting method. Background technique [0002] The engine load spectrum is a combination of relevant load elements compiled for the life, reliability and strength analysis and test assessment of the engine and its components, and is the statistical result of the engine's load parameters under specified flight tasks, usage and service conditions . The engine service load spectrum is the load spectrum used by the active engine, also known as the actual measurement spectrum, which is obtained from the actual flight load measurement and flight mission investigation, and can be directly applied to the life determination and extension of the engine. Flight parameters record the working conditions of various systems of the aircraft and various information of the flight status, reflecting the pilot's operation and u...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06F17/50
CPCG06F30/15G06F2218/02Y02T90/00
Inventor 孙志刚邢广鹏宋迎东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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