Method for analyzing service life of high maneuverability aircraft base on detail fatigue rating

A life analysis and rating technology, applied in the field of aircraft fatigue, can solve the problems of life analysis and different reliability indicators that cannot be directly applied to high-mobility aircraft, and achieve the effects of shortening the development cycle, less calculation workload, and significant economic benefits

Inactive Publication Date: 2015-07-29
SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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Problems solved by technology

The detail fatigue rating (DFR) method is often used in the life analysis of large transport aircraft and passenger aircraft. This method is similar to the static strength analysis method and can be completed simultaneously with the structural static strength analysis. It has the advantages of simplicity and speed. , but this analysis method cannot be directly applied to the life analysis of high maneuvering aircraft due to the difference in reliability index and load spectrum

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  • Method for analyzing service life of high maneuverability aircraft base on detail fatigue rating
  • Method for analyzing service life of high maneuverability aircraft base on detail fatigue rating
  • Method for analyzing service life of high maneuverability aircraft base on detail fatigue rating

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Embodiment Construction

[0053] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0054] The following is an example of the life calculation of the outer wing lower panel of a high maneuvering aircraft.

[0055] First, compile the load spectrum for detailed fatigue rating analysis based on the random spectrum of this type of aircraft

[0056] A basic spectrum block of the random spectrum of this type of aircraft consists of 12 typical subjects, a total of 131 takeoffs and landings, representing 176.333 flight hours. In order to ensure the integrity of the basic spectrum blocks, a spectrum with 12167 flight hours as a complete cycle was constructed, including 69 basic spectrum blocks, and the number of load cycles was 228495 times.

[0057] The complete load cycle is extracted by the rainflow counting method, and m=4 is taken. According to the selection principle and method of the standard constant amplitud...

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Abstract

The invention belongs to the field of an aircraft fatigue theory and relates to a method for analyzing service life of a high maneuverability aircraft base on detail fatigue rating. The analyzing method comprises the following steps: step1, preparing load spectrum analyzed based on the DFR (detail fatigue rating) of the high maneuverability aircraft; step2, analyzing the reference value of the DFR; step3, calculating the DFR0 value; step4, calculating the fatigue rating coefficient RC of the component; step5, confirming the allowable value [DFR] of the structure DFR; step6, calculating the allowable stress [sigma max]; step7, calculating and assessing the fatigue strength margin; step8, calculating the reliable lifetime of the structure; step9, creating a stress level control curve and providing the allowable stress value of the objective service life. The analyzing method has the advantages that the process of performing fatigue design and service life assessment by the DFR method is relatively simple, the calculation workload is relatively low, the operating efficiency of the whole department can be dramatically improved, and thus the analyzing method has the important significance to shorten the research period of a new machine and to save the research cost, and the economic benefit is obvious.

Description

technical field [0001] The invention belongs to the field of aircraft fatigue, and relates to a life analysis method of a high-mobility aircraft based on detailed fatigue ratings. Background technique [0002] Generally, the nominal stress method and the local strain method are mostly used in the fatigue life analysis of high-mobility aircraft, and the application of these two methods must face a large number of material stress-life or strain-life curves, stress spectra, and iso-life curves. Data preparation greatly increases the workload in the aircraft fatigue design phase. The detail fatigue rating (DFR) method is often used in the life analysis of large transport aircraft and passenger aircraft. This method is similar to the static strength analysis method and can be completed simultaneously with the structural static strength analysis. It has the advantages of simplicity and speed. , but this analysis method cannot be directly applied to the life analysis of high maneu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G01N3/00
Inventor 隋福成周丽君陈亮
Owner SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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