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作 者:焦敬品[1] 于兆卿[2] 刘文华[1] 张强[1]
机构地区:[1]北京工业大学机械工程与应用电子技术学院,北京100124 [2]燕山大学机械工程学院,秦皇岛066004
出 处:《仪器仪表学报》2013年第3期588-595,共8页Chinese Journal of Scientific Instrument
基 金:国家自然科学基金(10572017;11272017);北京市自然科学基金(2211005)资助项目
摘 要:机械结构(如齿轮、轴承、密封)中薄液体层对其性能有很大影响。针对传统超声反射回波方法时间分辨率低,难以实现薄层厚度测量以及压电换能器测量结果受界面耦合性能影响问题,提出了基于小波变换奇异点提取的薄液体层厚度电磁超声测量方法。同时,研究了小波变换基函数及分析尺度对薄液体层超声回波信号奇异点提取的影响,优化出适合薄层厚度测量的小波变换基函数和分析尺度范围。检测试验表明,基于小波变换奇异点提取的电磁超声技术可以很好地实现薄液体厚度测量。The durability of mechanical structures such as gears, bearings and seals relies on the integrity of the liquid layer separating the contact surfaces. Traditional ultrasonic pulse-echo method has low time resolution and it is difficult to measure the thickness of the thin layer; and the measurement result of ultrasonic measurement with piezoelectric transducer is easy to be influenced by the contact condition between the piezoelectric transducer and specimen. In this paper, an electromagnetic acoustic thickness measurement method for thin liquid layer based on singularity extraction with wavelet transform is proposed. Meanwhile the influence of different wavelet basis functions and scale extents on singularity extraction for ultrasonic echo signal of thin liquid layer is investigated; and the optimal wavelet basis functions and scale extents suitable for the thickness measurement of thin liquid layer are obtained. Experiment results indicate that the electromagnetic acoustic testing method based on singularity extraction with wavelet transform can achieve the thickness measurement of thin liquid layer nicely.
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