基于模型确认的高温环境复杂结构动力学建模方法研究

项目名称： 基于模型确认的高温环境复杂结构动力学建模方法研究

项目编号： No.11472132

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 何欢

作者单位： 南京航空航天大学

项目金额： 72万元

中文摘要： 建立能够准确预示机械结构系统在高温环境下的力学行为特征的结构动力学模型一直是理论界和工程界关注的重点。本项目研究基于模型确认的高温环境下的复杂结构动力学建模问题，提出一套适用于高温环境下的复杂结构动力学计算的高精度、高效分析方法。通过项目研究，提出一种变温系统模型的热物性参数识别方法，为准确的模拟结构在高温环境下的温度分布状态提供基础；然后，建立各级结构动力学模型，提出一种考虑温度效应的局部非线性系统模型缩聚方法对模型自由度进行缩聚，提高计算效率；提出一种考虑温度效应的结构动力学模型修正方法，并通过该方法对各级模型进行模型修正，提高各级模型计算精度；针对连接件的非线性特点，提出一种考虑温变效应的连接件建模方法；建立系统级模型，提出一种考虑温度和频率效应的阻尼模型来描述整个系统的能量耗散特征；最后，通过系统级模型确认试验对所建立的高温环境下的结构动力学模型的预报精度进行评估。

中文关键词： 结构振动；动力学建模；模态；模型确认；高温环境

英文摘要： How to build the dynamic model to predict the dynamic behavior of a structure precisely is very important to the researchers. This program focuses on the dynamic modeling methods based on model validation for structure under high temperature environment. The main purpose of this program is to present a series of methods suitable for modeling the dynamic characteristics of the structures under high temperature environment with high computational accuracy and efficiency. In order to obtain the accurate temperature distribution on the structures, thermal parameters identification methods for the structure systems considering the temperature effects will be presented. Then, the model reduction method will be presented to reduce degree of freedom of the localized nonlinear system, the temperature effect is also considered in the model reduction method. The computation cost for solving the equations of the structure under variable temperature will be greatly reduced by using the model reduction method. The new model updating methods for the dynamic system under high temperature will be developed. These new model updating methods will take the temperature effect into account. With the model updating method developed in this program, the computational accuracy for each component will greatly improved. The modeling method for the joints in the structures will be developed in this program. The modeling method will consider the influence of the localized nonlinearities and the temperature effect. In this program will develop a new damping model suitable to predict the energy dissipation of the structure under high temperature. The damping model presented here considers influence of the temperature effects, the variable frequency will also be taken into account. The corresponding damping parameters identification method will be presented too. Finally, validity of these methods presented in the program will be evaluated by test.

英文关键词： Structural vibration;Dynamic modeling;Mode;Modal validation;High temperature environment