Current Collection Maintenance Laboratory

Supply, United States

Current Collection Maintenance Laboratory

Supply, United States

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Sugahara A.,Laboratory Head of Current Collection Maintenance Laboratory | Yamashita C.,Current Collection Maintenance Laboratory | Usuki T.,Current Collection Maintenance Laboratory | Mitsumoji T.,Current Collection Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2013

Bending strain, which exerted on contact wire with every pantograph passage, may cause fatigue of contact wire. We designed a cross-section shape of contact wire in an attempt to reduce this bending strain. We confirmed that this cross-section shape did not make worse galloping property (property of vertical vibration caused by a cross wind) through wind tunnel tests. We also confirmed that this cross-section shape could be applied to manufacturing contact wire with high strength copper alloy through trial manufacture. Compatibility with fittings (hanger ears, double ears, termination fittings, etc.) was tested with this trial piece and no problems were found. A meaningful decrease in bending strain was observed in pantograph running tests.


Sugahara A.,Head of Current Collection Maintenance Laboratory | Yamashita C.,Current Collection Maintenance Laboratory | Usuki T.,Current Collection Maintenance Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2010

The rain flow method has been put forward as a method for waveform counting to estimate what the fatigue life span would be under actual waveform stress. The authors carried out experiments to test its applicability to hard drawn copper contact wire. In order to consider the effect of mean tensile stress when applying the rain flow method it is first necessary to define the fatigue life span properties for the various mean tensile stresses. The authors confirmed that these estimations can be found using fatigue test results from hard drawn copper contact wire placed under two types of mean tensile stress condition. The authors then conducted six fatigue tests to investigate the applicability of the rain flow method. The actual measured fatigue life span in tests generally exceeded estimations The rain flow method may therefore conceivably be used to derive a method for safe estimation of fatigue life.

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