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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>THE STATUS OF ADVANCED PROPULSION TECHNOLOGY IN JAPAN</title>
      <link>https://trid.trb.org/View/177427</link>
      <description><![CDATA[This report describes the efforts of the Japanese transit industry, which includes manufacturers and transit operators, in the area of advanced propulsion systems for urban rail vehicles. It presents different chopper system designs, new ac drive developments, various commercial frequency and audio frequency signalling systems, investigation of potential electromagnetic interference problems, and possible countermeasures. Six Japanese transit systems using chopper cars are described in some detail in Appendix A and a widely used commutation circuit of these choppers is described in Appendix B. Other related topics, such as equipment reliability and maintenance, are also discussed.]]></description>
      <pubDate>Fri, 30 Sep 1983 00:00:00 GMT</pubDate>
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      <title>ELECTROMAGNETIC INTERFERENCE CHARACTERISTICS OF ADVANCED PROPULSION SYSTEMS FOR URBAN RAIL VEHICLES</title>
      <link>https://trid.trb.org/View/170478</link>
      <description><![CDATA[Early research and development efforts by the Urban Mass Transportation Administration (UMTA) in the area of urban rail transit were long range programs attempting to apply advanced technology to problems plaguing U.S. transit properties. The programs themselves are known collectively as Subsystem Technology Applications to Rail Systems (STARS). This study of electromagnetic interference (EMI) characteristics of advanced propulsion systems, directed toward resolving total systems problems with EMI, is a part of a larger STARS program. This report describes various track circuit signalling systems and identifies different modes of possible EMI from onboard electrical power subsystems for urban rail vehicles. Chopper controlled ac drives and inverter controlled ac drives are analyzed and characterized as electromagnetic noise sources. Waveforms of currents through various reactors in the drive circuitry are presented. Finally, eleven different chopper circuit configurations are analyzed in detail in Appendix A and the characteristics of multiple-car trains are reviewed in Appendix B.]]></description>
      <pubDate>Thu, 28 Oct 1982 00:00:00 GMT</pubDate>
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      <title>MEASUREMENTS OF ELECTROMAGNETIC NOISE RADIATED FROM AUTOMOTIVE IGNITION SYSTEMS</title>
      <link>https://trid.trb.org/View/168981</link>
      <description><![CDATA[Measurements of the amplitude probability distributions and the average crossing rates of the electromagnetic noise radiated by automotive ignition systems were made at 30 MHz, 47 MHz, 147 MHz, 224 MHz and 445 MHz. The ignition noise from a single car and a 12-car matrix were each measured in a 10 kHz bandwidth, using a field-intensity meter, a DM-4, a desktop calculator, and an X-Y plotter. The DM-4 is an instrument built by NTIA to measure amplitude probability distributions and average crossing rates. Numerical integration of the amplitude probability distributions was used to determine the rms, the average, and the average logarithm of the envelope of the measured noise.]]></description>
      <pubDate>Fri, 12 Jun 1981 00:00:00 GMT</pubDate>
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      <title>VARIABILITY IN MEASUREMENT PROCEDURES FOR IGNITION NOISE</title>
      <link>https://trid.trb.org/View/29732</link>
      <description><![CDATA[Measurements of electromagnetic radiation from automobiles do not always agree when made at different sites or at different times at the same site. A study has been made of SAE Standard J551c on measurement of such radiation from motor vehicles or other internal combustion devices (excluding aircraft) from 20 to 1000 MHz to determine whether portions of the standard are open to misinterpretation or may be imprecise enough to lead to variability in the findings. The report discusses some experiments to find the variability involved with antennas and test site configurations.]]></description>
      <pubDate>Fri, 03 Dec 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/29732</guid>
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      <title>IMPROVED SUPPRESSION OF RADIATION FROM AUTOMOBILES USED BY THE GENERAL PUBLIC</title>
      <link>https://trid.trb.org/View/23986</link>
      <description><![CDATA[The incidental electromagnetic radiation from an automobile that is termed ignition noise is caused by fast-rise-time (impulsive) currents that flow in the vehicle's wiring. The three major sources of these impulses are the breakdown in the distributor of the gap between the rotor and the posts, the breakdown of the spark-plug gap, and the closure of the breaker points. To suppress the ignition noise, each of these sources can be treated individually. Concepts were developed and prototypes were built and tested for incorporating simple low-pass filters directly into the spark plug (by appropriate sizing of the plug's shell and inner electrode) and into the distributor. The intent of this work was to take an individual vehicle with its noise already suppressed by the techniques used in mass production in the United States, a vehicle selected as being the quietest among a group of similarly treated vehicles, and to improve its noise suppression by 10 dB over the frequency range 30 to 500 MHz.]]></description>
      <pubDate>Thu, 26 Jun 1975 00:00:00 GMT</pubDate>
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