基于相图几何特征的夹芯梁蒙皮裂纹识别方法  

Identification Method for Skin Cracks of Truss Core Sandwich Beam Based on Geometric Features of Phase Diagram

作　　者：黄雅华 陈建恩[1,2] 葛为民[1,2] 刘军[1,2] HUANG Ya-hua;CHEN Jian-en;GE Wei-min;LIU Jun(Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control,School of Mechanical Engineering,Tianjin University of Technology,Tianjin 300384,China;National Demonstration Center for Experimental Mechanical and Electrical Engineering Education,Tianjin University of Technology,Tianjin 300384,China)

机构地区：[1]天津理工大学天津市先进机电系统设计与智能控制重点实验室,天津300384 [2]天津理工大学机电工程国家级实验教学示范中心,天津300384

出　　处：《计算机仿真》2021年第1期441-445,450,共6页Computer Simulation

基　　金：天津市自然科学基金(17JCYBJC18800,17JCZDJC38500);国家自然科学基金(11872274)。

摘　　要：通过分析主共振发生时,含蒙皮呼吸裂纹与无裂纹的金字塔型点阵夹芯梁的相图几何特征,提出一种基于相图几何特征的裂纹参数识别方法。首先,采用"像素法"计算相图面积,利用定义的"准标准差公式"描述含裂纹夹芯梁相图面积的相对变化量,并定义相图面积参量为含裂纹与无裂纹相图面积之差和准标准差的比值,分析了该相图面积参量随裂纹位置和裂纹深度的变化情况。然后,结合两个相图面积参量的等高线探测裂纹参数。数值算例结果表明,该方法能准确识别出结构的损伤位置和损伤程度。According to the geometric characteristics of the phase diagram of the pyramid lattice sandwich beam with and without skin breathing cracks during the main resonance,this paper puts forward a method of crack parameter identification based on the geometric characteristics of the phase diagram.Firstly,the"pixel method"was utilized to calculate the phase diagram area.Secondly,the defined"quasi-standard deviation formula"was applied to describe the relative variation of the phase diagram area of the sandwich beam with cracks,and the phase diagram area parameter was set as the ratio of the difference between the phase diagram area with cracks and that without cracks and the quasi-standard deviation.Then,the variation of the phase diagram area parameter with the crack location and depth was analyzed in detail.Finally,the detection of crack parameters was completed by combining with the contour lines of the two-phase diagram area parameters.The results show that the method can accurately identify the location and degree of the structure damage.

关 键 词：相图 几何特征 裂纹 夹芯梁 

分 类 号：O322[理学—一般力学与力学基础] O327[理学—力学]