| Project/Area Number |
61550297
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
計測・制御工学
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
FUJIWARA Osamu Faculty of Engineering, Nagoya Institute of Technology, 工学部, 助教授 (60135316)
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| Project Period (FY) |
1986 – 1988
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Sliding current collecting system / Discharge occurrence frequency / Discontact rate / Noise current / Band-pass-filter / Algorithm / Spectrum analyzing equipment / 統計的検定 / パンタグラフ / インパルス応答 / アルゴリズム |
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| Research Abstract |
The purpose of this study is to offer a new method for measuring the discharge occurrence frequency ( discontact rate) using the high frequency currents ( noise currents ) flowing in the sliding current collector. The following results are obtained for the subject of the discontact arcs. The principle is based upon the successive measurement of the time interval between the maximum responses of the band-pass-filter (BPF) at the single frequency in the VHF band to noise currents flowing through the pantograph, since this interval approximately corresponds to the duratio of the arc or the non-arc. In the case where the gaussian BPF is used, the computer computation shows that the above method can estimate the discontact rate. The theoretical equation is derived to roughly estimate the discontact rate. For confirming the theoretical validity and the effectiveness of the method presented here, comparison is made between the computation and the theoretical results. In the case of the non-ga
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ussian BPF commonlyused, the computer computation shows that this method gives the measurement error. For reducing this error, some algorithms are presented by using the data sampled from the envelopes of the filter response. A new estimation method is also presented by using a statistical test, which requires no apriori informations such as the arc voltage and the circuit parameters of the current collecting system. For experimentally confirming the results obtained, the spectrum analyzingequipment is constructed by using a personal computer. The operation is checked by measuring the duty ratios of the recurrent pulses and the pseudo-random pulses. The experiment is performed by using the sliding contact apparatus simulating the current collector. It is found that although in the case where the short arcs do not occur across the sliding contacts the validity of this method is verified, in the case where the short arcs appear the method gives the large estimation error and also that this results from the overlapped responses of the BPF and the noises superimposed on the sampled data. At present, we have been investigating an another estimation method of the discontact rate using the specific current fluctuation during the arc discharge. Less
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