Method for evaluating large-gradient extremely-high-temperature thermal intensity of complex curved surface structure of aerospace plane

Abstract

The invention discloses a large-gradient extremely-high-temperature thermal intensity evaluation method for a complex curved surface structure of an aerospace aircraft, and relates to the technical field of aircraft design, and the method comprises the following steps: S1, intercepting actual feature data; s2, carrying out a heat intensity experiment; s3, constructing a heat intensity calculation model; s4, performing data comparison; s5, carrying out a secondary experiment on the heat intensity; s6, secondary construction of a heat intensity calculation model; s7, performing secondary data comparison; s8, carrying out weighted calculation on a final strain value; and S9, carrying out weighted calculation on a final displacement value. According to the large-gradient extremely-high-temperature thermal intensity evaluation method for the complex curved surface structure of the aerospace aircraft, the accurate and comprehensive thermal intensity evaluation method is provided for the complex curved surface structure of the aircraft in a large-gradient fast time-varying extremely-high-temperature environment, and theoretical support is provided for development of the aerospace aircraft.

Description

technical field [0001] The invention relates to the technical field of aircraft design, in particular to a method for evaluating the large-gradient extremely high-temperature thermal strength of an aerospace aircraft complex curved surface structure. Background technique [0002] In the field of aerospace, with the strong military demand and advanced technology, hypersonic aerospace aircraft has become a cutting-edge weapon and equipment that countries around the world are competing to develop in the 21st century. In the field of aircraft design technology, accurate thermal strength assessment for key structural components of aerospace aircraft is an indispensable link in the development process of aerospace aircraft. [0003] The nose cone is a key structural component of an aerospace aircraft, and usually has a complex curved surface shape, which is called "complex curved surface structure" in the present invention. During the flight of aerospace aircraft, the complex cur...

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Problems solved by technology

The main problems of the thermal strength evaluation based on numerical calculation are: the thermal strength calculation model of complex curved surface structures under the environment of large gradient and fast time-varying extreme high temperature cannot fully reflect the real structural state, resulting in inaccurate thermal strength evaluation; The main problem in the evaluation of thermal strength is that it is difficult to obtain strain data at places with large curvature of complex curved surface structures (such as corners / edges) and high temperature places above 1000°C during the experiment, which makes the thermal strength characteristics of complex curved surface structures unable to be comprehensive. Mastery, resulting in an incomplete assessment of the corresponding heat intensity

[0005] In view of the fact that the main problems of the above two evaluation methods cannot be solved for a long time, how to realize accurate and comprehensive thermal intensity evaluation for the complex surface structure in the extreme high temperature environment with large gradient and fast time-varying has become the key point in the development process of aerospace aircraft. One of the problems, there is an urgent need for corresponding technical inventions

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