Walking Electrification on Floor of High-Rise Building and Reduction Method of Human-Body Potential

高层建筑楼层行走带电及人体电位降低方法

• 批准号: 13650408
• 负责人: FUJIWARA Osamu
• 金额: $ 2.05万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650408/
• 关键词: electrostatic discharge; walking electrification; human-body potential; remaining charge; footstep surface potential

It is almost impossible to predict when the electromagnetic interferences (EMIs) of high-tech information equipment due to an event of electrostatic discharge (ESD) may happen. Particularly in the high-rise intelligence buildings, the wide use of high-polymers and air-conditioning facilities promotes such the EMI occurrence, which has brought about serious situations. We received grant-in-aids from 2001 to 2002 for scientific research to cope with the above-mentioned problem. As a result, we elucidated the mechanism of walking electrification on the floor of high-rise buildings, and grasped quantitatively the attenuation characteristics of human-body (HB) potential, which leads to providing effectively preventive means against EMIs caused by ESD events. The outline of the findings obtained in this study is as follows.In 2001, we proposed a new equivalent circuit model in order to predict the floor surface potential due to the induced charges on the floor, and verified its validity. For … More the footstep surface potentials that have never been measured so far, we tried to measure them with a newly developed measurement meter of two-dimensional footstep surface potentials, which consists of placement in line of commercially available potential meters. Comparing the measured waveforms of the footstep surface potential with those calculated using the equations derived from the equivalent circuit model, we found that the time change of the measured surface potential after the floor kick has the same trend as the calculated one. This finding implies that the equivalent circuit model can predict not only charge leak to the floor surface from the shoe sole landing on the floor but also leak process fo floor charges induced on the footstep for the shoe kicking the floor. Due to working failure of the footstep surface potential meter developed here, however, we could not obtain accurately the surface potentials, which did not enable us to confirm the quantitative verification of the proposed equivalent circuit model.In 2002, we improved the footstep surface potential meter and investigated the validity of the equivalent circuit for the charge leak process on the floor in comparison with the measurement of the floor surface potential. We first derived an equation in the Laplace domain for the footstep surface potential when the charged HB kicks the floor, and calculated the potential from the numerical inverse Laplace transformation. Also we measured simultaneously the HB and footstep surface potentials, changing the HB charge voltage. Comparing the measured potential waveforms with those calculated form the equivalent circuit model, we found that there is good agreement between the measured and calculated attenuation characteristics of the HB potential nomalized to the HB charge voltage. On the other hand, the measured attenuation characteristics of the footstep surface potential normalized to its initial potential approximately agreed with the calculated results regardless of the HB charge voltages, while we observed that there are some discrepancies between the measured and calculated initial footstep surface potentials and also that the measured potentials are not always proportional to the HB charge voltages. This may be because when kicking the floor, the charge occurs between the shoe sole and floor and it charges the floor capacitance, which results in changing the floor potential.The future subject is to grasp quantitatively the charge appearing due to walking on the floor and its dynamic time behavior. Less

高技术信息设备由于静电放电(ESD)事件而产生电磁干扰(EMIS)的时间几乎是无法预测的。特别是在高层智能建筑中，高分子材料和空调设施的广泛使用促进了这种EMI的发生，并带来了严重的情况。我们在2001至2002年间获得了科学研究补助金，以应对上述问题。因此，我们阐明了高层建筑地面行走带电的机理，定量地掌握了人体(HB)电位的衰减特征，从而为ESD事件引起的EMIS提供了有效的预防手段。2001年，我们提出了一种新的等效电路模型来预测地板感应电荷引起的地板表面电势，并验证了该模型的有效性。对于…更多的是迄今为止从未被测量过的足迹表面电位，我们试图用一种新开发的二维足迹表面电位测量仪来测量它们，该测量仪由商业上可用的电位计的放置方式组成。将测得的足面电势波形与由等效电路模型导出的方程计算的结果进行比较，发现踢地后测得的表面电势随时间的变化趋势与计算值一致。这一发现表明，等效电路模型不仅可以预测鞋底落在地板上对地板表面的电荷泄漏，而且可以预测鞋子踢地板时脚步上感应的地板电荷的泄漏过程。然而，由于我们研制的脚踏式表面电位计工作失败，我们无法准确地获得表面电位值，这使得我们无法确认所提出的等效电路模型的定量验证。我们首先在拉普拉斯域导出了带电HB踢地时脚步表面势的方程，并通过数值反拉普拉斯变换计算了该势能。我们还同时测量了Hb和足迹表面的电位，改变了Hb的充电电压。将测量的电势波形与由等效电路模型计算的电势波形进行比较，发现测量和计算的Hb电势衰减特性与Hb充电电压的衰减特性有很好的一致性。另一方面，无论HB充电电压如何，归一化为初始电位的足迹表面电位的测量衰减特性与计算结果基本一致，但我们观察到测量的初始足迹表面电位与计算的初始足迹表面电位之间存在一些差异，而且测量的电位并不总是与HB充电电压成正比。这可能是因为踢地板时，鞋底和地板之间的电荷对地板电容充电，从而导致地板电位的变化。未来的课题是定量地掌握由于在地板上行走而出现的电荷及其动态时间行为。较少

项目成果

森 育子: "ESDガンの放電で生ずる近傍磁界の特性測定"電子情報通信学会環境電磁工学技術研究報告. EMCJ2002-12. 61-66 (2002)

森育子：“ESD枪放电产生的近场磁场特性的测量”IEICE环境电磁工程研究报告。 61-66（2002）。

Hideyuki Tanaka: "A Circuit Approach to Simulate Discharge Current Injected in Contact with an ESD-gun"Proc. of 2002 International Symposium & Technical Exhibition on EMC, Beijing, China. 486-489 (2002)

Hideyuki Tanaka：“模拟与 ESD 枪接触时注入的放电电流的电路方法”Proc。

Osamu Fujiwara: "FDTD Modeling for the Computation of Electromagnetic Fields Radiated by Electrostatic Discharges"Proc. of 2001 Asia-Pacific Radio Science Conference, Tokyo, Japan. 83-83 (2001)

Osamu Fujiwara：“静电放电辐射电磁场计算的 FDTD 建模”Proc。

張 小江: "ESDガンによる放電電流波形のFDTDシミュレーションとその検証"電子情報通信学会信学技報. EMCJ2002-42. 1-5 (2002)

张晓江：“ESD枪放电电流波形的FDTD模拟及其验证”IEICE技术报告1-5（2002）。

張 小江: "ESDガンによる放電電流波形のFDTDシミュレーションとその検証"電子情報通信学会環境電磁工学技術研究報告. EMCJ2002-42. 1-5 (2002)

张晓江：“ESD枪放电电流波形的FDTD模拟及其验证”IEICE环境电磁工程研究报告，EMCJ2002-42（2002）。