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声发射检测技术是无损检测中的一种新方法,它可以提供连续的状态信息,适合于设备在线监控及早期破坏预警。通过声发射传感器采集声信号,再利用计算机信号处理系统对采集的声信号进行分析、转换、处理,以此为原理构成检测系统。该检测技术是材料试验、水利水电工程设备在线监测和安全评估的有效手段。 相似文献
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前言 目前为止,声发射技术作为一种全新的无损检测方法,在发达国家已得到广泛应用,我国的声发射技术起步于70年代,通过几十年的发展,已广泛应用于许多领域,如用于压力容器、管道的检测,核工业、航空、航天工业重要部位的检测等,金属材料、复合材料及磁性材料的声发射检测等,也用在金属切削中.在木材加工领域内,AE早已应用在木材及其制品的非破坏检测及干燥应力的监测等方面.在木材切削方面,国内研究虽还是一片空白,但日美等国家已做了一系列研究,并逐步在生产中应用. 相似文献
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浅谈声发射的小波分析与木工刀具磨损检测 总被引:7,自引:2,他引:7
介绍声发射概念、声发射信号处理方法、计测系统及小波分析技术检测声发射信号奇异性的原理,分析奇异性指数和刀具磨损的对应关系,并提出了声发射检测木工刀具磨损的实验模型。 相似文献
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本文介绍了木材切削中的声发射及声发射的表征、测量和处理,回顾总结了国内外AE在木材切削中的应用. 相似文献
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实木家具以其诸多优点越来越受到广大消费者的青睐,但市场却鱼龙混杂,产品质量以次充好、掺杂使假等现象屡见不鲜,质量投诉也高居不下,笔者认为消费者在购买实木家具时首先应该搞清实木家具的分类及概念,另外还要掌握一定的选购技巧,这样才能避免买到以次充好、华而不实的家具而蒙受损失. 相似文献
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松木家具在室内设计中的应用 总被引:1,自引:0,他引:1
本文就目前松本家具在室内设计中的应用所存在的问题进行研究,认为影响松木家具应用问题的关键在于如何处理松木家具与室内空间尺度、造型风格以及嘉池陈设的关系,提出了应与室内空间尺度适应、造型风格级一及其他陈设进行搭配等合理应用松木家具的新方法。 相似文献
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Contact acoustic emission (AE) measurement, together with a puncture test, were used to evaluate the crispness and crunchiness of three apple cultivars. A storage program was used to induce changes in apple crispness and crunchiness. The instrumental measurements were compared with the results of sensory evaluation.
It was found that crispness and crunchiness could be evaluated instrumentally by measuring firmness, AE events, mean AE amplitude or the product of AE events and mean AE amplitude. For one cultivar, however, firmness was not correlated with any sensory attribute. Generally, the best correlation with sensory attributes was found for the exponential value of AE events. Contact AE allows the measurement of sensory crispness or crunchiness for a given apple cultivar or independently for any apple cultivar. Contact AE can be considered as a useful method for the evaluation of sound properties of wet-crisp foods.
Contact acoustic emission method can be used for instrumental evaluation of crispness and crunchiness of apples. The method allows more accurate evaluation of these attributes than firmness measurement. There is a chance to extend the application to other wet-crisp foods and to use the method together with other destructive tests, like texture profile analysis or single edge notched bend. 相似文献
It was found that crispness and crunchiness could be evaluated instrumentally by measuring firmness, AE events, mean AE amplitude or the product of AE events and mean AE amplitude. For one cultivar, however, firmness was not correlated with any sensory attribute. Generally, the best correlation with sensory attributes was found for the exponential value of AE events. Contact AE allows the measurement of sensory crispness or crunchiness for a given apple cultivar or independently for any apple cultivar. Contact AE can be considered as a useful method for the evaluation of sound properties of wet-crisp foods.
PRACTICAL APPLICATIONS
Contact acoustic emission method can be used for instrumental evaluation of crispness and crunchiness of apples. The method allows more accurate evaluation of these attributes than firmness measurement. There is a chance to extend the application to other wet-crisp foods and to use the method together with other destructive tests, like texture profile analysis or single edge notched bend. 相似文献
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三维编织复合材料压缩损伤声发射特性分析 总被引:4,自引:2,他引:2
论述了声发射技术在三维编织复合材料压缩过程中的应用及实验方法,给出了声发射在三维编织复合材料中压缩过程的特征。结果表明,声发射参数可描述复合材料在不同情况下内部变形的损伤机制。表面编织角是影响三维编织复合材料力学性能的主要参数,编织角小于30°,三维编织复合材料具有较好的压缩性能;编织角大于40°,三维编织复合材料压缩力学性能明显降低。为分析复合材料的力学性能,改善材料复合工艺提供理论基础。 相似文献
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P. Niemz R. Emmler E. Pridöhl J. Fröhlich A. Lühmann 《Holz als Roh- und Werkstoff》1994,52(3):162-168
Comparisons between acoustic emissions and piezoelectric properties in wood drying were performed. It was determined that with acoustic emission the signal resolution was better than with piezoelectric effect. Acoustic emissions were affected by drying gradient and wood species. In this case the frequency of acoustic emission was between 30 and 200 kHz. Acoustic signals can be used for the control of wood drying processes. For industrial use of these technology more investigations are to be worked out. 相似文献