Method for determining inspection period of metal structure defects of helicopter

A metal structure and defect inspection technology, applied in the direction of sampling, measuring devices, instruments, etc., can solve the problems of reducing the service life of the structure, endangering flight safety, initial missed inspection, etc., and achieve the effect of ensuring safety

Inactive Publication Date: 2017-04-26
CHINA HELICOPTER RES & DEV INST
View PDF4 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, a structural part may have initial missed defects and undetectable accidental damages from its raw materials to manufacturing and delivery. These defects and damages may greatly reduce the service life of the structure, thereby endangering flight Safety

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for determining inspection period of metal structure defects of helicopter
  • Method for determining inspection period of metal structure defects of helicopter
  • Method for determining inspection period of metal structure defects of helicopter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below ...

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

No PUM Login to view more

Abstract

The invention provides a method for determining the inspection period of metal structure defects of a helicopter, and belongs to the technical field of fatigue design of a helicopter structure. The method comprises the steps: firstly, according to a structural material, manufacture and use conditions, selecting defect types and parameters, and determining a danger zone of the structure through stress analysis and fatigue tests; followed by prefabricating various defects, and based on actual measured load and breakdown stress analysis, determining dynamic and static loads of metal structure defect tolerance tests; and finally, determining a structure safe defect tolerance S-N curve, calculating the safe life of the structure with the defects, respectively calculating the different defects, and taking the minimum value of the calculation results as the inspection period of the structure with the defects. Based on the danger analysis, the tests of a sample with defects are used for determining the fatigue limit of the structure with the defects, the safe inspection period and the allowable maximum damage of the detected structural defects provided by flight load spectra are combined, the use safety of the helicopter can be ensured, and the airworthiness clause defect tolerance validation requirements are met.

Description

technical field [0001] The invention belongs to the technical field of fatigue design of helicopter structures, and mainly relates to a method for verifying the defect tolerance performance of metal structures of helicopters. Background technique [0002] FAR / CCAR27 / 29.571 Airworthiness Clause "Fatigue Assessment of Flight Structures (Fatigue)" clearly stipulates that unless there are specific structural restrictions, the fatigue assessment of the structure must meet the requirements of defect tolerance or damage safety. [0003] Usually the service life of the key structural parts of the helicopter is given by the safe life method, and the safe life method is based on the ideal situation that the structure is intact. In fact, a structural part may have initial missed defects and undetectable accidental damages from its raw materials to manufacturing and delivery. These defects and damages may greatly reduce the service life of the structure, thereby endangering flight Safe...

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
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N1/28G01N1/32
CPCG01N1/28G01N1/286G01N1/32G01N3/32G01N2203/0073
Inventor 顾文标邹静喻溅鉴潘春蛟
Owner CHINA HELICOPTER RES & DEV INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap