首先，基于裂缝扩展规律，采用扩展有限元方法，利用模拟退火技术，建立裂缝扩展反演模拟模型；
This method established the fracture propagation inversion model firstly, based on law of fracture propagation and extended finite element method, by using annealing simulation method.
应用BP -神经网络法对数学模型进行修正，建立有限元数值模拟方法补充剔除数据并对数学模型适用范围进行扩展。
The mathematical models are amended by BP neural network algorithm, and method of finite element numerical simulation is used to compensate the removal data and extend the applied range.
在此方法基础上建立了扩展厢式车厢体展开状态下有限元模型，并对其进行了强度分析。
On the basis of the method, the FEA (finite element analysis) model of the van body in extendable work condition is established and the structure strength analysis of the van body is proceeded.
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