Estimation of electric charge distribution in thundercloud by using the inverse approaches

利用反演方法估计雷雨云中的电荷分布

• 批准号: 09680442
• 负责人: MURAI Tadakuni
• 金额: $ 2.24万
• 依托单位: Toyama Univ.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09680442/
• 关键词: thundercloud; electric field; boundary element; charge distribution; lightning forecast; estimation algorithm; 雷雲電荷; 逆問題; 数値落雷予測

The information of the electric field intensity on the ground is useful for forecasting the lightning. To investigate the capability of the proposed approaches for estimating the electric charge distribution in thundercloud from the electric field information, the following studies were carried out.First, a new boundary element technique named semi-infinit boundary element was proposed to calculate the electric field caused by the electric charge in cloud. It is found that the electric field distribution considering the effect of the topography can easily be evaluated by using the technique.Second, to estimate the electric charge distribution from the electric field measured on the ground surface, some algorithms such as Newton scheme, Least square's method, Sampled pattern matching method, Neural network and Kalman filter were investigated. In the electric charge estimation problem, the number of the measuring points may be so small that a special device must be introduced to increase the "virtual measuring point". It is found from the numerical simulation that Newton scheme would be most suitable for accurate estimation, and also the electric field intensity data must be measured with three significant digit figures for the estimation.As another study, a weather-proof type equipment using potentiometer was developed to measure the electric field on the ground. However, the quality of the measurement accuracy must be improved for practical use.

地面电场强度信息对闪电预报有一定的参考价值。首先，提出了一种新的计算雷电云中电荷电场的边界元技术--半无限元边界元。其次，研究了牛顿法、最小二乘法、采样模式匹配法、神经网络和卡尔曼滤波等算法对地表电场分布的估计。在电荷量估算问题中，测点的数量可能很少，必须引入特殊的装置来增加“虚拟测点”。数值模拟结果表明，牛顿法最适合用于精确估计，而且电场强度数据必须用三位有效位数来测量才能进行估计。然而，为了实际使用，必须提高测量精度的质量。

项目成果

本田,堀田,村井,池田: "地形を考慮した雷雲による電界のシミュレーション" 日本シミュレーション学会,第18回計算電気・電子工学シンポジウム論文集. 149-152 (1997)

Honda、Hotta、Murai、Ikeda：“考虑地形的雷云电场模拟”，日本模拟学会，第 18 届计算电气和电子工程研讨会论文集 149-152 (1997)。

本田,堀田,村井,若井: "カルマンフィルタを用いた雷雲電荷分布の推定"日本シミュレーション学会第20回計算電気電子工学シンポジウム論文集. 89-92 (1999)

Honda、Hotta、Murai、Wakai：“使用卡尔曼滤波器估计雷云电荷分布”日本模拟协会第 20 届计算电气和电子工程研讨会论文集 89-92（1999 年）。

K. Honda, Y. Horita, T. Murai and N. Ikeda: "Simulation of Thunder-cloud's Electric Field on the Topographic Ground Surface"Proc. of 18-th JSST Sym. on Computational Electrical and Electronic Eng.. 149-152 (1997)

K. Honda、Y. Horita、T. Murai 和 N. Ikeda：“地形地表雷云电场的模拟”Proc。

K. Honda, Y. Horita, T. Murai, N. Ikeda and T. Wakai: "Boundary Element Caluculation of Thunder-cloud's Electric Field Considering Topography"IEE Japan. vol. 119-B, No. 4. 483-490 (1999)

K. Honda、Y. Horita、T. Murai、N. Ikeda 和 T. Wakai：“考虑地形的雷云电场的边界元计算”IEE 日本。