简支梁损伤定位的直接指标法应用  

Application of Direct Index Method of Simply Supported Beam Damage Location

作　　者：包振明[1] 马骏[1] 林哲[1] 赵德有[1] 王任众 

机构地区：[1]大连理工大学船舶工程学院,辽宁大连116024 [2]大连辽南船厂,辽宁大连116041

出　　处：《船舶工程》2013年第5期79-82,108,共5页Ship Engineering

摘　　要：结构损伤诊断要解决的关键问题之一是判断结构损伤的位置。损伤会使结构的模态参数发生改变。应变模态比固有频率和振型对局部损伤更加敏感。基于应变模态差分原理的损伤定位直接指标法ISMSD(Strain Mode Shape Difference)具有不需原始模态数据的优点。本文通过应用该方法对假定两处损伤的钢质非贯穿裂纹简支梁在几种不同损伤程度状况下损伤位置直接损伤指标值计算。由直接指标值的大小正确地判定损伤位置,尤其是损伤量较小时。One of the key problems is to detect the damage location in the structure. Damage generally changes the modal characteristics of the structure. The strain mode is more sensitive to local damage than the natural frequency and displacement mode. The direct index method of damage location detection Ismso （Strain Mode Shape Difference） is based on the strain mode shape difference theory, which has the advantage without the modal characteristics of the original structure. Through this method, the ISMS9 results of the partial two cracks of non-impenetrate simply supported beam with different damage extents are obtained. It can correctly identify the damage location by direct index, especially when the damage is small.

关 键 词：损伤定位 非贯穿裂纹 应变模态 直接指标法 差分 双裂纹 

分 类 号：TB123[理学—工程力学]