有限元仿真模型V&V技术研究

仿真模型建模过程存在多种误差输入，将引起仿真预测结果的不精确性。采用仿真模型V&V（Verification and Validation,验证与确认）技术，进行仿真模型的建模误差分析与控制。利用物理试验数据进行仿真模型的精度评估，基于模型修正算法进行仿真建模参数的自动修正，提升仿真和试验结果的一致性，帮助设计师基于精确的仿真模型进行产品的虚拟性能预示，提升仿真技术在产品研制流程中的地位和作用。阐述了模型V&V的概念和流程，对模型V&V的关键技术和原理进行了详细论述,以NASA Rotor37转子验模为例进行了V&V案例说明。

The Finite Element Analysis Model V&V Method Research

In this paper, the mid-high frequency noise response inside the oversized fairing of a heavy rocket has been analyzed based on the statistical energy analysis (SEA) method to provide a basis for the noise reduction design of the fairing. The influence of the geometric parameters of the satellite envelope structure and noise reduction material parameters on the noise response inside the fairing is considered in the analysis process. The SEA model of the rocket fairing considering the satellite structure is firstly established. Then, different satellite envelope models are proposed for the complex structural forms of the satellite, and the sensitivity analysis of the envelope model parameters on the noise response in the fairing is carried out. The results show that the satellite envelope structure form and geometric parameters have obvious influence on the noise response inside the fairing, which is a non-negligible influencing factor. Finally, the noise reduction effects of laying various noise reduction materials on the inner wall of the fairing under different parameters are analyzed, and the optimization scheme for laying noise reduction materials is given. The design method proposed in this paper can provide some theoretical support for the noise reduction design of heavy rocket fairing.