| 王志春,孙雪冬,袁伟.连铸坯尾端电磁超声横波换能机制分析[J].声学技术,2019,38(5):532~536 |
| 连铸坯尾端电磁超声横波换能机制分析 |
| Analysis of transverse wave energy conversion mechanism of electromagnetic ultrasound at the end of continuous casting slab |
| 投稿时间：2018-09-08 修订日期：2018-11-20 |
| DOI：10.16300/j.cnki.1000-3630.2019.05.009 |
| 中文关键词: 电磁超声换能器 洛伦兹力 磁致伸缩 激励频率 高温铁磁材料 |
| 英文关键词: electromagnetic ultrasonic transducer lorenz force magnetostriction excitation frequency high temperature ferromagnetic material |
| 基金项目:国家自然科学基金（61463041）、内蒙古自治区自然科学基金（2018MS06011）资助。 |
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| 中文摘要: |
| 为了研究电磁超声横波检测表面温度为500℃连铸尾端的坯壳厚度的问题，分析此温度下电磁超声换能器的换能机制。本文以坯壳厚度为30 mm的Q235小钢坯为被测对象，利用有限元软件COMSOL建立圆柱形永磁体和螺旋线圈的电磁超声换能器模型。分析在钢坯表面温度为500℃时的换能机制的主导因素，在相同偏置磁场强度和激发电流下，通过对比仅考虑洛伦兹力作用下的位移振幅和洛伦兹力与磁致伸缩应力的叠加作用下的位移振幅大小来分析主导因素，并利用现有的实验条件进行实验验证，同时分析了激励频率对换能机制的影响。研究结果表明，当坯壳表面温度为500℃时，随着频率增大，横波激发换能机制由两种机制转变成洛伦兹力占主导因素，且铁磁材料降低了电磁超声换能器的激发难度，为设计电磁超声换能器系统提供理论基础。 |
| 英文摘要: |
| In order to study the problem of measuring the thickness of billet shell at the tail end of continuous casting with a surface temperature of 500℃ by electromagnetic ultrasonic shear wave, the energy transfer mechanism of the electromagnetic ultrasonic transducer for this measurement is analyzed. The Q235 billet with 30 mm shell thickness is taken as the research object and the electromagnetic ultrasonic transducer model composed of cylindrical permanent magnet and spiral coil is established by using finite element software COMSOL in this paper. Under the same magnetic field intensity and excitation current, the dominant factors of the energy transfer mechanism at 500℃ slab surface temperature are analyzed by comparing the displacement amplitude under the action of Lorentz force with the displacement amplitude under the superposition of Lorentz force and magnetostrictive stress. The experimental verification is carried out by using the existing experimental conditions. Meantime, the influence of excitation frequency on energy transfer mechanism is analyzed, and the results show that at 500℃, with frequency increasing, the shear wave excitation mechanism of the electromagnetic ultrasonic transducer is changed from the superposition of Lorentz force and magnetostrictive stress to Lorenz force, and the ferromagnetic material reduces the excitation difficulty of electromagnetic ultrasonic transducer. This study provides a theoretical basis for the design of electromagnetic ultrasonic transducer system. |
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