Method for determining fatigue load spectrum of aircraft opening structure
A technology of fatigue load spectrum and opening structure, which is applied in the field of determination of fatigue load spectrum of aircraft large opening structure, can solve the problems of inability to accurately consider the structural details of the corner area and poor analysis accuracy, so as to improve analysis accuracy and analysis efficiency Effect
Pending Publication Date: 2021-11-19
中航西飞民用飞机有限责任公司
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The problem existing in the existing technology is: the stress concentration factor of a typical structure can be obtained by consulting the engineering manual, which cannot accurately consider the structural details of the corner area (for example: the width of the reinforcement plate, especially when the size of the reinforcement plate is irregular), so the analysis poor precision
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0014] Referring to the accompanying drawings, what embodiment provides is that on the aircraft wall 1, a plurality of opening structures 2 are provided, and this opening structure is a porthole located on the cabin wall, and the following determines the opening structure 2 according to the method provided by the present invention. Fatigue load spectrum.
[0015] First, the overall finite element model of the aircraft is established according to the digital model of the aircraft design. In the overall finite element model, the rod element 3 and the shell element 4 are used to simulate the opening structure 2 area of the aircraft, as shown in figure 2 As shown; on the overall finite element model of the aircraft, the design loads under the various service states of the aircraft are applied respectively, and the stresses of all the bar elements 3 in the opening structure 2 area of the aircraft are obtained, and the load spectrum curve 6 of the aircraft opening structure area...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for determining a fatigue load spectrum of an aircraft opening structure. The method comprises the following steps: simulating an aircraft opening structure area in an overall finite element model by adopting a rod unit and a shell unit; respectively loading the design load of the aircraft in each use state, and obtaining the stress of all rod units in the opening structure area of the aircraft in each use state; forming a load spectrum curve of the aircraft opening structure area; reflecting all geometric features of the aircraft opening structure area in the detail finite element model; obtaining the maximum stress position and the maximum stress value of the airplane opening structure area corresponding to the rod unit; and performing linear superposition on the load spectrum curve of the aircraft opening structure region, the position of the maximum stress of the aircraft opening structure region in the detail finite element model and the maximum stress value to obtain the fatigue load spectrum of the aircraft opening structure region.
Description
technical field [0001] The invention belongs to the technology related to aircraft design fatigue analysis, in particular to the determination of fatigue load spectrum of aircraft large opening structure. Background technique [0002] In the structural design of the aircraft, it is necessary to design many opening structures on the aircraft body, such as boarding doors, cargo doors, service doors, openings in the connection area between the fuselage and the wing, opening areas in the cabin porthole, etc. These opening structures have some common structural features: 1) The opening structure is a high structural discontinuity area, and its stress concentration factor is relatively large, so it is necessary to focus on the fatigue strength evaluation; 2) The corner area of the opening structure has a large stress gradient, causing fatigue Evaluation is difficult. Due to the constantly changing load of the opening structure, the fatigue-risk parts of the structure will be da...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/23G06F119/14
CPCG06F30/15G06F30/23G06F2119/14
Inventor 李宝珠何彧王卫伟
Owner 中航西飞民用飞机有限责任公司