摘要
使用有限元模型进行仿真分析已在我国船舶行业中得到了广泛的应用,但是对有限元模型可靠性的研究较少。针对水下航行器结构,将振动频率的试验结果是否处于有限元模型计算的预报区间内作为标准,判断有限元模型的可靠性。基于设计参数型的有限元模型修正和确认方法,以水下航行器结构振动频率为响应特征,建立有限元的响应面模型,使用蒙特卡罗模拟和核密度估计预报水下航行器前四阶模态频率的区间估计和概率密度函数,通过比较试验结果和区间估计判断水下航行器有限元模型的可靠性。
Finite element simulation is widely used in the ship industry, but its reliability has yet to be investigated. In this paper, a method is proposed to judge the reliability of the underwater vehicle model according to whether the experiment results are within the predicted ranges obtained from the finite element model or not. Based on the model updating and validation methods, the response surface model that takes vibration frequency of the underwater vehicle as responses is established ; then, the interval estimation and the probability density function of the first four mode frequencies are predicted via Monte Carlo simulation and kernel density estimation. The reliability of the underwater vehicle finite element is validated by comparing experiment results with the interval estimate.
出处
《中国舰船研究》
CSCD
北大核心
2015年第1期103-108,共6页
Chinese Journal of Ship Research
基金
国家自然科学基金资助项目(51379083)
高等学校博士学科点专项科研基金博导类资助课题(20120142110051)
关键词
模型修正和确认
响应面模型
蒙特卡罗模拟
核密度估计
model updating and validation
response surface model
Monte Carlo simulation
kernel den- sity estimation
