基于某特种车辆爆炸冲击下驾驶室内声场分析

Cabin Inner Acoustic Analysis under Blast Condition of a Military Vehicle

根据某军用越野车的整车结构建立了结构有限元模型、流场和土壤有限元模型及声腔有限元模型。在对其进行6 kg TNT当量地雷替代物爆炸试验的前提下,在Ls-dyna中利用欧拉-朗格朗日算法和流-固耦合算法对其进行了整车爆炸有限元分析;并进行了对比,验证了有限元模型的准确性。提取Ls-dyna中的爆炸结果作为边界条件,利用LMS Virtual.lab对其在爆炸条件下的驾驶室内声场进行了声学分析;并与试验中测得的乘员耳侧声压级进行了对比,证明了所用方法的有效性。利用一套完整的流程,提出了一种研究车辆防护的新方法。

According to the vehicle structure of a military vehicle body,established body structural,flow field,soil and acoustic cavity finite element model.The finite element analysis of the entire vehicle explosion was carried out in Ls-dyna using ALE and FSI algorithms,and the accuracy of the finite element model was verified based on the 6kgTNT mine surrogate explosion test.The explosion results in Ls-dyna were extracted as the acoustic analysis boundary condition and the sound field in the cab under explosive conditions was analyzed by LMS Virtual lab.Then the effectiveness of the method is verified by comparing the sound pressure level(SPL)on the ear of the driver of FEM result with the result measured in the experiment.A complete set of procedures are used to propose a new method of vehicle protection.