| 基于TDC的L_(CR)波切向应力检测方法的研究 |
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| 引用本文： | 戴仙金,丁杰雄,李凌轩. 基于TDC的L_(CR)波切向应力检测方法的研究[J]. 机械强度, 2010, 32(1) |
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| 作者姓名： | 戴仙金 丁杰雄 李凌轩 |
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| 作者单位： | 电子科技大学,机械电子工程学院,成都,610054 |
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| 摘 要： | 基于固体中声速与应力的关系以及临界折射纵波(critically refracted longitudinal wave,LCR)的产生机理,提出一种利用LCR波从表面检测物体内部切向应力的实施方法,并对测量系统的硬件结构和工作原理进行详细阐述。针对应力改变导致的LCR波传播时间的微量变化,系统采用基于逻辑门绝对传输时间原理工作的"时间—数字转换器"(time to digi-tal converter,TDC)来满足高精度的时间间隔测量要求。在测量过程中采用"单端发射—双端接收"的布局模式进一步降低测量误差,以提高应力检测的精度。
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| 关 键 词： | LCR波 切向应力 时间间隔测量 时间—数字转换器（TDC） |
METHOD WITH TDC FOR EVALUATING SHEAR STRESS BY LCR WAVE |
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| DAI XianJin,DING JieXiong,LI LingXuan. METHOD WITH TDC FOR EVALUATING SHEAR STRESS BY LCR WAVE[J]. Journal of Mechanical Strength, 2010, 32(1) |
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| Authors: | DAI XianJin DING JieXiong LI LingXuan |
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| Affiliation: | School of Mechatronics Engineering/a>;University of Electronic Science and Technology of China/a>;Chengdu 610054/a>;China |
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| Abstract: | Based on the relationship between the sound velocity and stress in solid and the theory of generating critically refracted longitudinal (LCR) wave,the practical way to measure the shear stress inside the workpiece from the surface by LCR wave is presented,and the structure and working principle of the evaluation system is described detailedly. In order to measure the little change in travel time of LCR wave caused by stress variation,the time digital converter (TDC) based on the delay in transmitting time o... |
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| Keywords: | Critically refracted longitudinal wave (L_(CR)) Shear stress Time measurement Time digital converter (TDC) |
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