| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for estimating the strain of trolley wire from the contact force of a pantograph capable of accurately and continuously estimating the stress (strain) exerted on the trolley wire during passing of the pantograph, by using the actually measured contact force between a wire and the pantograph. SOLUTION: The method relates to estimating of the stress (strain) of the trolley wire at a pantograph point. That is, from a characteristic equation (a) obtained from the wave equation of the trolley wire,λ<SP>4</SP>-(T-ρν<SP>2</SP>/EI)λ<SP>2</SP>-i(2ρνω/EI)λ-(ρω<SP>2</SP>/EI)=0 ... (A), where in these four characteristic roots of the formula (A),λ<SB>1</SB>is a complex number whose real part is positive,λ<SB>3</SB>is a complex number whose real part is negative,λ<SB>2</SB>is a positive pure imaginary number, andλ<SB>4</SB>is a negative pure imaginary number, the stress (strain) of the trolley wire at the pantograph point is estimated by multiplying a measured contact force by a conversion factor (b) into the strain of the trolley wire, (γ/EI)×[(λ<SB>1</SB>+λ<SB>2</SB>)/(λ<SB>1</SB>-λ<SB>3</SB>)(λ<SB>1</SB>-λ<SB>4</SB>)] ...(B). COPYRIGHT: (C)2009,JPO&INPIT
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