Method for determining parameters of thin-wall structure ribs under cyclic high temperature action on aircraft
By determining the fatigue life index and temperature spectrum, calculating the maximum allowable thermal stress, and adjusting the rib bar parameters through finite element analysis, the design insufficient or over-design problems caused by neglecting or roughly estimating the cyclic high-temperature thermal stress in the prior art is solved, and a more accurate and safe rib bar parameter design is achieved.
CN119692126APending Publication Date: 2025-03-25XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Patent Information
- Application Number
- CN202411863443.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-03-25
AI Technical Summary
Technical Problem
In the prior art, when designing thin-walled structural ribs affected by cyclic high temperatures on aircraft, the thermal stress generated by cyclic high temperatures is usually ignored or roughly estimated, resulting in insufficient design or over-design problems.
Method used
By determining the fatigue life index, cyclic high-temperature action temperature spectrum and DFRcutoff value of thin-walled structure, the maximum allowable thermal stress is calculated, the rib bar parameters are initially designed, the finite element model is constructed, the temperature field and stress field are solved, and the rib bar parameters are adjusted to meet the design requirements.
Benefits of technology
该方法充分考虑循环高温作用产生的热应力，对筋条参数进行详细设计，避免设计不足或过设计的情形，提供了有效的指导以确保飞机薄壁结构的安全性和可靠性。
✦ Generated by Eureka AI based on patent content.
Abstract
The invention belongs to the technical field of design of thin-wall structure ribs on airplanes, and particularly relates to a method for determining parameters of thin-wall structure ribs under the action of circulating high temperature on an airplane, which comprises the following steps: step 1, determining a fatigue life index, a circulating high temperature action temperature spectrum and a DFRcutoff value of a thin-wall structure; 2, calculating the maximum allowable thermal stress of the thin-wall structure based on the fatigue life index and the DFRcut value of the thin-wall structure; step 3, preliminarily designing rib parameters; 4, constructing a finite element model of the thin-wall structure; 5, solving the temperature field distribution of the thin-wall structure by using the finite element model of the thin-wall structure; 6, solving a stress field of the thin-wall structure by taking the temperature field of the thin-wall structure as a boundary condition; 7, according to the stress field distribution of the thin-wall structure, the maximum allowable thermal stress of the thin-wall structure is compared, rib parameters are modified, and suitable rib parameters are obtained.
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