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Airplane fatigue load designing method

A technology of fatigue load and design method, applied in the direction of calculation, special data processing application, instrument, etc., to achieve the effect of fatigue load design specification

Inactive Publication Date: 2015-06-03
SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no systematic fatigue load calculation method and process at home and abroad. In order to standardize the design of fatigue load, the present invention creates a fatigue load design process, and establishes a fatigue load design method based on this process. Taking a certain type of aircraft as an example Complete fatigue load design

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Embodiment Construction

[0018] The present invention will be described in further detail below by specific embodiments in conjunction with the accompanying drawings.

[0019] The present invention studies with a certain civil airliner as an example.

[0020] 1. Determine the flight mission. According to the actual use of this aircraft, its flight mission is determined as route flight, which is subdivided into short-range, medium-range and long-range. A single route is decomposed into flight mission profiles in detail, that is, multiple mission segments such as takeoff, departure, climb, cruise, descent, and approach, as shown in Table 1.

[0021]

[0022] 2. Determine the loading form. According to the flight mission, the loading form of this aircraft is divided into maneuvering situation and gust situation.

[0023] 3. Determine the load calculation status. Within the range of the flight envelope, the load calculation state is determined by the flight mission profile and the loaded form, as s...

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Abstract

The invention belongs to the field of airplane load designing and relates to an airplane fatigue load designing method. The airplane fatigue load designing method is characterized by including the following steps: firstly, determining a flight mission, namely dividing the flight mission into training flight and an airline flight, and decomposing in a detailed manner to acquire flight mission section; secondly, determining a load-bearing form, namely dividing the load-bearing form into maneuvering condition and gust condition; thirdly, determining a load calculation state, namely determining the load calculation state according to the flight mission section and the load-bearing form within a flight envelope range; fourthly, performing fatigue load calculation, namely building an aerodynamic force calculation model and an aerodynamic / structural coupling model, and using a structural finite element model for fatigue load calculation to acquire fatigue load. The airplane fatigue load designing method has the advantages that a designing process is created, so that standardized designing of the fatigue load is realized.

Description

technical field [0001] The invention belongs to the field of aircraft load design and relates to the proposal of a fatigue load design method. Background technique [0002] Fatigue is failure caused by cycles or changes in load that a single action is not sufficient to cause failure. Fatigue failure may occur when it is much smaller than the original static strength of the material, so it is more dangerous. [0003] The aircraft encounters long-term repeated load changes, which will lead to "fatigue" damage to the structure, so this load history is generally called "fatigue" load. Fatigue load is an important consideration in aircraft design and the basic basis for life determination. [0004] The aircraft generally needs to go through the following processes in each flight: take-off taxi-climb-cruise (and do various maneuvers)-descent-landing impact-taxi. In each process, the aircraft is subjected to fatigue loads, therefore, ground sliding loads, gust loads, maneuvering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 邓立东李荣科宗宁王文倬聂鹏飞赵卓林裴志刚李俊华
Owner SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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