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声发射检测与结构完整性评价实验室主讲:刘玉琢化工过程机械前沿技术声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory1利用局部磁滞回线特性的无损检测新方法2提高管道检测缺陷定位的准确率3检测器探头耐磨层改造4储罐底板漏磁检测缺陷整体分布图自动生成方法5漏磁检测器用于海底管道的磁化研究声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory利用局部磁滞回线特性的无损检测新方法吴德会,李雪松,黄一民,杨秀淼,刘志天(厦门大学机电工程系测试控制技术研究所厦门)声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory磁滞是铁磁性材料(如钢板)的磁感应强度B随磁场强度H变化时特有的现象。不妨对MFL技术中,钢板被磁化的动态过程进行分析。首先,设钢板最初处于磁中性状态下,即对应图1(a)中所示的a点。当对该钢板实施直流偏置磁化H时,则钢板的磁化过程沿着磁化曲线1变化,并稳定在b点(Hb,Bb)。若在H的2局部磁滞回线声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory基础上再施加一个峰峰值为△H的变励磁场,则磁化过程可达到最大点c点。但在退磁时,由于磁滞现象的存在,其磁感应强度B将沿着比原来途径稍高的一段曲线到达最小点d点,如曲线2所示,即高磁滞回线。当H再由最小点d往回运动时,又由于磁滞作用,B将沿如曲线3所示低磁滞回线回到最大点c点。由于所施加H为往复均匀变化,因此被测钢板中实际磁化曲线为图1(a)中曲线2和曲线3沿箭头方向而形成的“磁滞环”。由于该磁滞环只是在偏置磁场条件下因励磁往复波动而造成的“小闭合线”。其与常规物理学中“磁滞回线”的对比分布声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory如图1(b)所示。为区别两者,在本文中称该小闭合线为“局部磁滞回线”。图中BS表示饱合磁感应强度。声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegrityAssessmentLaboratory声发射检测与结构完整性评价实验室AcousticEmissionInspectandStructureIntegri
本文标题:化工过程机械前沿技术.
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