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Water entry impact load modeling method for cross-medium aircraft

A modeling method, water impact technology, applied in special data processing applications, geometric CAD, design optimization/simulation, etc., can solve problems such as rapid prediction of unfavorable application loads, limited calculation state quantity, and large time-consuming, etc., to achieve calculation speed Fast, fast modeling, and less modeling workload

Pending Publication Date: 2022-03-04
中国空气动力研究与发展中心空天技术研究所
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Problems solved by technology

[0009] At present, the method in the prior art has a limited number of calculation states, and the modeling process takes a long time, and the calculation process takes a long time and costs a lot. It often requires a supercomputer to be implemented, which is not conducive to engineering applications and other states. fast load prediction

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  • Water entry impact load modeling method for cross-medium aircraft
  • Water entry impact load modeling method for cross-medium aircraft
  • Water entry impact load modeling method for cross-medium aircraft

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Embodiment

[0055] The present invention is proposed as a technical solution of an aircraft into the water across the medium impact load modeling method includes the following steps:

[0056] S1, three-dimensional model using CATIA software geometry model aircraft structure or component across the medium;

[0057] S2, the geometry and ABAQUS software, and wherein establishing fluid model;

[0058] S3, is set into the water velocity, attitude and angle of attack, with coupled Eulerian - Lagrangian approach (the CEL) method, in solving the ABAQUS Solver;

[0059] Using a state of the water using Mie-Grüneisen modeling equation of state:

[0060] p-p H = Γρ (E m -E H ),

[0061] Where P H For the Hugoniot pressure, E m Hugoniot of specific energy, which is related to the density, Γ = Γ 0 ρ 0 / Ρ, Γ 0 It is material parameters, ρ 0 Reference density, η = 1-ρ 0 / Ρ is the nominal volume of compressive strain;

[0062] General Materials Hugoniot curve fitting relationship:

[0063]

[0064] Mie-...

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Abstract

The invention discloses a water entry impact load modeling method for a cross-medium aircraft, and relates to the technical field of cross-medium aircrafts, and the method comprises the following steps: S1, employing CATIA three-dimensional model software to establish a geometric model of a cross-medium aircraft structure or assembly; s2, importing the geometric model into ABAQUS software, and establishing a liquid model in the ABAQUS software; s3, setting a water entry speed, an attack angle and an attitude, and solving in ABAQUS Solver by adopting a coupled Euler-Lagrangian method; s4, obtaining water entry impact load training data, and generating a training data file; s5, establishing a GRNN grid, and importing training data; and S6, obtaining the GRNN network model of the water impact load according to the S5, and rapidly estimating the load conditions in other states through the GRNN network model of the water impact load. Compared with a method in the prior art, the method has the advantages of being easy to implement, high in universality, small in modeling workload and high in calculation speed, and is suitable for rapid load evaluation calculation in the scheme design and engineering development process.

Description

Technical field [0001] The present invention relates to the technical field across the medium of the aircraft, and more particularly, it relates to an aircraft into the water across the medium impact load modeling method. Background technique [0002] In recent years, with the development of national aviation industry technology, the world's leading aviation power requirements of the existing aviation aircraft have become more sophisticated, traditional single medium aircraft can not meet the actual demand, so the research can adapt to the environment across a variety of media medium aircraft has become one of the important directions of development of the aviation industry powerhouse. Cross-media vehicle for multiple spanning across different media, combining the advantages of the airborne vehicle and underwater vehicle, resulting in a load of criticism across the media, the structure of the mechanical environment experienced slightly evil. Medium load current studies across the...

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Application Information

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IPC IPC(8): G06F30/15G06F30/27G06F30/28
CPCG06F30/15G06F30/27G06F30/28Y02T90/00
Inventor 郝东余婧杨伟王琪武龙苏杰
Owner 中国空气动力研究与发展中心空天技术研究所
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