Electrostatics Safety Analysis and Controlling by Design of Experiment and System Thinking for a Railway Vehicle Carriage

應用實驗設計與系統思考安全分析高速列車靜電與控制

鄭永長(Yung-Chang Cheng) ； 朱長志(Chang-Chih Chu)

《中國機械工程學刊》 42卷5期 (2021/10) Pp. 489-500

摘要

The human body is susceptible to static electricity shock due to movement or friction in dry environment. Static electricity affects the efficiency of train services and public safety in high-speed trains. This study determines the reasons for the accumulation of static electricity in newly purchased trains and the optimal design that prevents accumulation of static electricity. A cause and effect diagram is used to determine the principal factors for the accumulation of static electricity. The Taguchi method and an analysis of variance are used to determine the factors that most significantly affect the accumulation of static electricity and the optimal combination of parameters is derived. The results of the optimization experiment show that the electrostatic potential that accumulates on service personnel can be maintained at less than 1,000 volts, which represents an improvement of 37.7%, so the risk of shock due to static electricity is reduced. Because the humidity measured in carriages has a significant effect on the accumulation of static electricity, T-test is used to compare the humidity in new and old trains. System thinking and causal loop diagram analysis are used to devise strategies to decrease the risk of shock due to an accumulation of static electricity in railway vehicles of the future.

關鍵字

Static electricity ； Cause and effect diagram ； Taguchi method ； System thinking ； Causal loop diagram analysis

並列摘要

人體在乾燥環境中容易因運動或摩擦而受到靜電衝擊。靜電會影響高速列車的列車服務效率和公共安全。本研究發現新購列車產生靜電積聚的原因以及防止靜電積聚的最佳化設計。因果關係圖用於瞭解靜電積累的主要原因。使用田口實驗法和ANOVA分析來確定影響靜電積累最顯著的因子，並推導出參數的最佳組合。最佳化實驗結果顯示，能將人員身上積聚的靜電維持在1000（v）以下；改善37.7%之靜電觸電風險。由於車廂內測量的相對濕度對靜電的積累有顯著影響，因此採用T-test來檢定新舊列車間的濕度差異性，發現新購列車車廂較為乾燥。系統思維和因果循環圖分析可幫助列車的改善設計，以降低未來鐵路車輛中由於靜電積累而引起的電擊風險。