Full-helicopter anti-crash hierarchical simulation method

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...

AI Technical Summary

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 crash process, and cannot provide accurate data for 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 during the analysis process. , the desired result cannot be obtained

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