Full-helicopter anti-crash hierarchical simulation method

A simulation method and helicopter technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as long time required, crashes, large models, etc., to reduce analysis costs and time required for simulation , the effect of meeting the precision requirements

Inactive Publication Date: 2014-07-30
HARBIN
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Problems solved by technology

[0002] The anti-crash system of a helicopter consists of three parts: landing gear, fuselage, and seats. There are two main methods of simulation analysis. The first method is to conduct simulation analysis for each system separately. The design input conditions are independent and cannot be accurate. It reflects the distribution of energy in each system and the mutual support of each system during the helicopter cra

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  • Full-helicopter anti-crash hierarchical simulation method
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Embodiment

[0023] Full helicopter crash simulation with skid landing gear, crash seats and foam sub-floor fuselage

[0024] 1. Anti-crash simulation analysis of the whole aircraft

[0025] ①Using the finite element analysis pre-processing software Patran, establish the simulation model of the flexible skid landing gear, the rigid material model of the helicopter fuselage and the rigid material model of the anti-crash seat, that is, the material of the skid landing gear model is elastic-plastic material, and the fuselage and The seat material is made of rigid body material, and the crash conditions of the helicopter are input at the same time. The falling speed of the helicopter is required to be 8.3m / s, so the initial downward speed of 8.3m / s is applied to all nodes of the model, and the crash plane is specified as a rigid ground. ;

[0026] ②Using the transient dynamics analysis software Dytran to carry out helicopter crash prevention, the moment before the landing gear is damaged and ...

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Abstract

The invention belongs to the technical field of helicopter designs and analysis, and relates to a full-helicopter anti-crash hierarchical simulation method. The full-helicopter anti-crash hierarchical simulation method comprises the following steps: using a finite element analysis pre-processing software Patran, and respectively establishing a flexible landing gear simulation model, a helicopter fuselage rigid material model and an anti-crash seat rigid material model, then using a transient dynamics analysis software Dytran to carry out helicopter crash simulation, and then removing a landing gear model, using the finite element analysis pre-processing software Patran, changing the helicopter fuselage rigid material model to a fuselage flexible model, then removing a fuselage model, using the finite element analysis pre-processing software Patran, changing the seat rigid material model to a flexible model, and finally completing the full-helicopter anti-crash simulation. The full-helicopter anti-crash hierarchical simulation method disclosed by the invention uses a method of combination of the rigid-flexible models and hierarchical processing, thereby being capable of greatly reducing the required simulation time, lowering the analysis cost, meeting the precision requirement and accurately simulating helicopter crash gestures.

Description

technical field [0001] The invention belongs to the technical field of helicopter design and analysis, and relates to a grading simulation method for crash resistance of the whole helicopter. Background technique [0002] The anti-crash system of a helicopter consists of three parts: landing gear, fuselage, and seats. There are two main methods of simulation analysis. The first method is to conduct simulation analysis for each system separately. The design input conditions are independent and cannot be accurate. Reflecting the distribution of energy in each system and the mutual support of each system during the helicopter crash process cannot provide accurate data for the design. The second method is to establish a detailed flexible finite element model of the whole machine and conduct anti-crash simulation analysis. Since the anti-crash simulation analysis belongs to transient nonlinear dynamic analysis, the model is large and takes a long time, and crashes often occur dur...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 温永海宫少波齐德胜云庆文南力强张震韩刘朱洪艳
Owner HARBIN
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