Practical techniques for the vibration method with additional mass: effect of specimen moisture content
Practical techniques for the vibration method with additional mass: effect of specimen moisture content
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附加质量振动法的实用技术：试样含水量的影响
DOI：
10.1007/s10086-017-1653-0
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发表时间：
2017
影响因子：
2.9
通讯作者：
Hideo Kato
中科院分区：
文献类型：
--
作者：
Yoshitaka Kubojima;Satomi Sonoda;Hideo Kato
这项工作探讨了含水量的准确性，无损和简单地估计重量，密度和杨氏模量的振动测试，而不测量试样重量的影响。通过纵向振动和弯曲振动试验测量了有无集中质量时的共振频率。将初始水分含量为93-134%的湿试样在20 °C和65%相对湿度下干燥，并估计它们的重量、密度和杨氏模量。在振动测试过程中，由于干燥过程引起的共振频率的增加影响了估计的准确性。因此，应在获得具有集中质量的谐振频率之后测量没有集中质量的谐振频率。在弯曲振动试验中的估计精度高于纵向振动试验。这一趋势可以用有和没有集中质量时谐振频率测量的误差来解释。
This work examines the effect of moisture content on the accuracy of nondestructively and simply estimating weight, density, and Young’s modulus by a vibration test without measuring specimen weight. The resonance frequencies with and without concentrated mass were measured by longitudinal vibration and bending vibration tests. The wet specimens whose initial moisture contents were 93–134% were dried at 20 °C and 65% relative humidity, and their weight, density, and Young’s modulus were estimated. The accuracy of the estimation was affected by the increase in the resonance frequency, caused by the drying process, during the vibration tests. The resonance frequency without the concentrated mass should, therefore, be measured after obtaining the resonance frequency with the concentrated mass. The accuracy of the estimation in the bending vibration test was higher than that in the longitudinal vibration test. This tendency can be explained by the error in the measurement of resonance frequencies with and without the concentrated mass.