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一种基桩承载力试验中的位移测试方法 被引量:6
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作者 朱世峰 吕曹炯 +1 位作者 汪正兴 周志祥 《桥梁建设》 EI CSCD 北大核心 2017年第4期24-29,共6页
为改善目前基桩承载力试验中位移测试方法的经济性和便捷性,以既有连通管原理为基础,提出差压连通管式位移测试方法,建立测点位移与差压连通管内压差的变化量的关系,从而通过测量半封闭式连通管两端液体表面处的气压差变化实现对基桩试... 为改善目前基桩承载力试验中位移测试方法的经济性和便捷性,以既有连通管原理为基础,提出差压连通管式位移测试方法,建立测点位移与差压连通管内压差的变化量的关系,从而通过测量半封闭式连通管两端液体表面处的气压差变化实现对基桩试验时竖向位移的测量。结合实际工作要求,研发该方法的位移测量设备,并通过与步进电机控制式移动平台及百分表对应的测试试验验证了该方法的准确性。将该方法应用于某大桥自平衡法试桩工程中,结果表明:(1)测试期间无需基准梁,无安装垂直度要求,可降低试验成本;(2)与电子位移传感器测量结果一致,最大差值0.24mm,说明应用该方法进行基桩承载力试验中的位移测量具有较好的经济性和可行性。 展开更多
关键词 桩基础 承载力试验 竖向位移 测试方法 差压连通管 位移测量设备 对比试验
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Cylindrical spiral triboelectric nanogenerator 被引量:4
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作者 Xiao Hui Li Chang Bao Han +1 位作者 Li Min Zhang Zhong Lin Wang 《Nano Research》 SCIE EI CAS CSCD 2015年第10期3197-3204,共8页
In recent years, triboelectric nanogenerators have attracted much attention because of their unique potential in self-powered nanosensors and nanosystems. In this paper, we report a cylindrical spiral tdboelectric nan... In recent years, triboelectric nanogenerators have attracted much attention because of their unique potential in self-powered nanosensors and nanosystems. In this paper, we report a cylindrical spiral tdboelectric nanogenerator (S-TENG), which not only can produce high electric output to power display devices, but also can be used as a self-powered displacement sensor integrated on a measurement ruler. At a sliding speed of 2.5 m/s, S-TENG can generate a short-circuit current (Isc) of 30 μA and an open-circuit voltage (Voc) of 40 V. As the power source, we fabricate a transparent and flexible hand-driven S-TENG. Furthermore, we demonstrate a self-powered S-TENG-based measuring tapeline that can accurately measure and display the pulled-out distance without the need for an extra battery. The results obtained indicate that TENG-based devices have good potential for application in self-powered measurement systems. 展开更多
关键词 triboelectricnanogenerator self-powering displacement sensor
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