基于动力学特性的金属点阵夹层板损伤识别方法研究

项目名称： 基于动力学特性的金属点阵夹层板损伤识别方法研究

项目编号： No.11502268

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 路玲玲

作者单位： 中国科学院力学研究所

项目金额： 26万元

中文摘要： 金属点阵夹层板损伤识别研究，对于未来飞行器结构的早期损伤预报、剩余寿命评估、结构维护、事故归零等都具有重要意义。本项目针对金属点阵夹层板开展基于动力学特性的损伤识别方法研究。旨在揭示不同损伤特征（类型、位置、程度）对点阵夹层板动力学特性的影响机制与规律，获得不同几何参数条件下影响规律的变化趋势。开展不同动力学参数的损伤敏感性分析，绘制动力学参数损伤敏感性的趋势图谱。在此基础上，提出损伤敏感标识量，发展针对不同损伤特征的识别方法。同时，本项目还将重点发展基于三维激光测振技术的点阵夹层板复杂动力学特性的精细捕捉试验方法。研究成果有望推进点阵夹层板损伤识别理论与测试技术的发展，促进这类新型轻质结构在航天热防护领域的应用。

中文关键词： 点阵材料；夹层板；损伤识别；动力学特性；振动试验

英文摘要： Damage identification of metallic sandwich panel with truss cores is very important to the early damage discovery, residual life assessment, structural maintenance and accident reset for future high-speed flight. This project aims to develop damage identification method for sandwich panel with truss cores based on their dynamic properties. Through systemic experimental approach and analytical method, the influences of damage features (style, location and extent) to its dynamic properties will be presented, and the trends of the influences for different structural geometries will be revealed. In addition, the sensitivities of dynamic parameters to damage will be obtained, and their trend charts for different structural geometries also will be provided. Based on the above analytical results, damage indexes will be presented, and the damage identification methods for different damage features will be proposed. Meanwhile, experimental method to capture detailed structural complicated modes will be developed relied on 3D laser Doppler velocimeter. The significances of the project is to make some progress in theoretical analysis and experimental technique in damage identification of truss core sandwich, and propel the application of this novel light-weight structure in the thermal protection systems in aerospace technology.

英文关键词： Truss material;Sandwich panel;Damage identification;Dynamic property;Vibration test