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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <title>OPTIMUM DESIGN OF COMMUTATION CIRCUIT IN A THYRISTOR CHOPPER FOR DC MOTOR CONTROL</title>
      <link>https://trid.trb.org/View/59894</link>
      <description><![CDATA[Expressions for the commutating capacitor voltage and current during the commutation period of the main and auxiliary thyristor in a chopper for a dc motor control system are found.  After a successful commutation, a certain amount of energy is "stored" in the circuit components, and for best component utilization this stored energy has to be minimized.  The procedure for minimizing stored energy in the commutation circuit results in the selection of optimum values of commutating capacitors and inductors.]]></description>
      <pubDate>Tue, 27 Dec 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/59894</guid>
    </item>
    <item>
      <title>SPEED CONTROL OF D. C. MOTOR USING THYRISTOR DUAL CONVERTER</title>
      <link>https://trid.trb.org/View/54223</link>
      <description><![CDATA[The paper describes the design, construction and testing of a closed-loop system for the speed control of a separately excited d.c. motor fed from a dual converter.  The dual converter makes possible regenerative braking and reversal of direction of rotation. There is only one firing unit and the firing pulses are diverted to the appropriate converter by a master controller.  There are three control loops: one for the armature current control, one for adjusting the firing angle of the oncoming converter, and one for speed control.  Proportional plus integral type of controllers have been used to achieve good dynamic and steady-state responses. Experimental results are given and compared with theoretical ones.]]></description>
      <pubDate>Tue, 31 May 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/54223</guid>
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    <item>
      <title>DEVICE TO MEASURE FORCE ANGLE OF A LINEAR SYNCHRONOUS MOTOR</title>
      <link>https://trid.trb.org/View/54224</link>
      <description><![CDATA[A force angle measurement device capable of measuring the displacement between the fundamental fields established by the linear synchronous motor (LSM) vehicle magnets and the three phase track is described.  The paper indicates that the force angle is fundamental to the understanding of the LSM steady state and transient behavior and effective operation will necessarily include control of this angle. Tests on a small model facility show the device operating over a 360 degree range.  Results are shown for the vehicle during steady state and transient conditions.]]></description>
      <pubDate>Tue, 31 May 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/54224</guid>
    </item>
    <item>
      <title>CAMS: A MICROPROCESSOR-CONTROLLED CONTAINER MARKING SYSTEM</title>
      <link>https://trid.trb.org/View/65206</link>
      <description><![CDATA[A system is described which uses two microprocessors to receive label data and control a high-power laser/deflector unit to generate permanent labels on the surfaces of shipping containers.  The CAMS unit is capable of generating 19 line labels with as many as 35 characters per line on fiberboard, wood, or suitably coated substrates in less than thirty seconds.]]></description>
      <pubDate>Wed, 16 Feb 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/65206</guid>
    </item>
    <item>
      <title>DIGITAL METHOD FOR DC MOTOR SPEED CONTROL</title>
      <link>https://trid.trb.org/View/65208</link>
      <description><![CDATA[A motor speed controller is presented using digital techniques to measure, compare, and correct motor speed.  In the prototype model, the range of speed control is approximately 200 rpm to 3000 rpm.  The digital approach eliminates measurement nonlinearity and makes the speed setting exactly reproducible.  The prototype's steady-state error is less than 0.2% of maximum speed, and it is shown how a direct extension of this design concept can easily bring steady-state error to well below 0.1% of maximum speed.]]></description>
      <pubDate>Wed, 16 Feb 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/65208</guid>
    </item>
    <item>
      <title>ANALYSIS OF CHOPPER-FED DC SERIES MOTOR</title>
      <link>https://trid.trb.org/View/45959</link>
      <description><![CDATA[The main problem in the analysis of chopper-fed dc series motor is the interdependence of armature induced voltage and the armature current and the fact that the relation between the two is nonlinear.  The different aspects of analysis such as performance equations, methods of their solution, and the representation of nonlinear magnetization characteristics of the dc series motor are described.  The calculated performance has been compared with the measured results.]]></description>
      <pubDate>Thu, 22 Jul 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/45959</guid>
    </item>
    <item>
      <title>MICROCOMPUTER APPLICATION IN GENERATING FORCE FUNCTIONS FOR AIRCRAFT TIRE LOAD TESTING</title>
      <link>https://trid.trb.org/View/34838</link>
      <description><![CDATA[A microcomputer is used to generate force functions for aircraft tire load testing.  Using the technique of multiplexing, one can feed more than four functions signals after D/A conversion to each corresponding hydraulic system. Such a system results in better performance with respect to accuracy improvement, design flexibility, hardware program can produce several different real time functions synchronously or asynchronously for various control applications.  /Author/]]></description>
      <pubDate>Tue, 16 Dec 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/34838</guid>
    </item>
    <item>
      <title>MICROPROCESSOR APPLICATION ON BOARD SHIPS</title>
      <link>https://trid.trb.org/View/34689</link>
      <description><![CDATA[Through their participation in several research projects concerned with the application of computers on board ships, the R & D department in Det Norske Veritas has played a major part in the development of 4 different types of microprocessor units suitable for installation on board ships. These are: Condition monitoring unit for diesel engines; condition monitoring unit for mechanical conditions in steam power plants; condition monitoring unit for thermodynamic conditions in steam power plants; and condition monitoring unit for dynamic loads in the ships' hull. All four units may generally be classified as minicomputer replacements. The applications are presented with a description of history, function, type of sensors, complexity of hardware/software, and experience obtained. Future aspects of microprocessor applications on board ships are also discussed.  (Authors)]]></description>
      <pubDate>Sat, 18 Oct 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/34689</guid>
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    <item>
      <title>MINIMIZING FUEL CONSUMPTION IN OCEAN VESSELS</title>
      <link>https://trid.trb.org/View/13624</link>
      <description><![CDATA[The rate at which a ship consumes fuel is nonlinearly related to both speed and amount of fuel in the ship's tanks.  A model for this phenomenon is developed.  The problem of finding the velocity pattern (as a function of time) necessary to move the ship between two fixed points in a fixed amount of time is then considered.  It is determined that the optimal velocity pattern is a constant. A typical numerical example is presented to illustrate the savings in fuel which might result when compared to other possible velocity patterns.]]></description>
      <pubDate>Fri, 11 Jan 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/13624</guid>
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