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    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
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    <language>en-us</language>
    <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>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
      <url>https://trid.trb.org/Images/PageHeader-wTitle.jpg</url>
      <link>https://trid.trb.org/</link>
    </image>
    <item>
      <title>OVERVIEW OF SOME PROBLEMS IN GROUND TRANSPORTATION</title>
      <link>https://trid.trb.org/View/132742</link>
      <description><![CDATA[SOME PROBLEM AREAS IN GROUND TRANSPORTATION SYSTEMS, ALONG WITH AEROSPACE SKILL APPLICATIONS ARE SURVEYED. SOME TECHNOLOGY AREAS ARE DISCUSSED: PERFORMANCE IN THE CONTEXT OF BLOCK SPEED RELATING TO STATION SPACING AND PASSENGER COMFORT, SYSTEM CAPACITY RELATING TO VEHICLE SIZE AND HEADWAY, AND POWER REQUIREMENTS AS IMPACTED BY VEHICLE- GUIDEWAY INTERACTION; SUSPENSION DYNAMICS IN THE CONTEXT OF RIDE QUALITY AND THE TRADE BETWEEN GUIDEWAY ROUGHNESS AND SUSPENSION SOPHISTICATION; PROPULSION AND POWER IN THE CONTEXT OF ELECTRIC SYSTEMS FOR MINIMUM ON-LINE NOISE AND POLLUTION; GUIDEWAYS IN THE CONTEXT OF SYSTEM COST SENSITIVITY TO CONFIGURATION AND STIFFNESS REQUIREMENTS AND INTERACTION WITH OTHER SYSTEM ELEMENTS; AND CONTROL AND COMMUNICATIONS IN THE CONTEXT OF HIGH CAPACITY, FAIL SAFE TRAFFIC CONTROL. IT IS CONCLUDED THAT NEW SYSTEM DEVELOPMENT, SYSTEMS INTEGRATION AND MANY TECHNOLOGY AREAS CAN BENEFIT FROM APPLICATION OF BASIC AEROSPACE SKILLS, BUT THAT OTHER AREAS SUCH AS SOCIOPOLITICAL INSTITUTIONAL CONSTRAINTS REQUIRE CONSIDERABLE AEROSPACE ACCLIMATION. /AUTHOR/]]></description>
      <pubDate>Sun, 31 Aug 2003 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/132742</guid>
    </item>
    <item>
      <title>FILTRATION OPENING SIZE BY SUSPENSION TESTS</title>
      <link>https://trid.trb.org/View/476499</link>
      <description><![CDATA[To design a geotextile filter by a probabilistic theory it is necessary to know the geotextiles pore-size distribution.  The suspension filtration teset procedure presented can be used to obtain this curve.  It could also be used to determine the filtration opening size parameters for needle-punched non woven geotextiles to be used in conventional design methods.]]></description>
      <pubDate>Tue, 03 Mar 1998 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/476499</guid>
    </item>
    <item>
      <title>COMMERCIAL VEHICLES AND HIGHWAY DYNAMICS</title>
      <link>https://trid.trb.org/View/466750</link>
      <description><![CDATA[Tentative partial contents include: Reduction of Dynamic Pavement Loads of Heavy Vehicles Through Optimal Suspension Damping and Axle Vibration Absorber; Development of a Control System Algorithm for a Heavy Vehicle Dynamics Model Using MATLAB/SIMULINK; Dynamic Performance of Articulated Tanker Vehicles with Different Tank Geometry; Heavy Truck Suspension Dynamics; Methods for Evaluating Suspension Road Friendliness and Ride Quality; Truck Tire Wet Traction; Effects of Water Depth, Speed, Tread Depth, Inflation, and Load; Directional Performance and Yaw Stability of Articulated Combination Trucks; A Discovery to the Strength of Truck Frames; Advantages of Structural Composites in Class 8 Truck Suspensions; Development of a Leaf Spring Design Program for Vehicle Suspension Systems.]]></description>
      <pubDate>Mon, 03 Feb 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/466750</guid>
    </item>
    <item>
      <title>MECHANICS OF ROAD VEHICLES</title>
      <link>https://trid.trb.org/View/108931</link>
      <description><![CDATA[THE SUBJECTS FURNISHED FOR THIS DOCUMENT BY HSRI ARE: PASSENGER MOTOR VEHICLES, VEHICLE: BRAKES, VEHICLE PARTS: SUSPENSION, CHASSIS/FRAME: TIRES, WHEELS: ACCELERATION, OPERATING CONDITIONS, PHYSICAL ASPECT: TORQUE, PHENOMENA: VIBRATION: VEHICLE PERFORMANCE: MECHANICAL, ENGINEERING, DISCIPLINES: TEXT BOOK, FORM, STUDY REPORT TYPE: DIAGRAMS, CONTENTS.]]></description>
      <pubDate>Fri, 22 Jul 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/108931</guid>
    </item>
    <item>
      <title>TEST OPERATIONS PROCEDURE (TOP) 2-2-8-- WHEELED VEHICLE CENTER OF GRAVITY</title>
      <link>https://trid.trb.org/View/387410</link>
      <description><![CDATA[Describes procedures for determining the center of gravity (CG) of wheeled vehicles.  The CG provides information relative to roll stability, transportability, and input for mobility model programs.]]></description>
      <pubDate>Tue, 07 Jun 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/387410</guid>
    </item>
    <item>
      <title>TRAVEL TIME MONITORING IN URBAN ARES - SURVEY DESIGN</title>
      <link>https://trid.trb.org/View/213298</link>
      <description><![CDATA[This paper describes the design of a survey to measure variations in travel time and their possible causes and to develop cost effective travel time survey instruments. After describing the background and objectives of the study it reviews in turn the uses to which travel time data can be put and the resulting survey requirements, the factors which might cause variations in travel time, and the available survey methods.  The survey strategy outlined in the final section is based on these reviews.  It concentrates on inbound peak period travel times over five radial routes in Leeds, and uses number plate matching to measure inter-vehicle variation.  Two other methods are also employed.  The survey period is spread over 14 months to identify seasonal effects, but uses a Latin square design to reduce the scale of the data collection task. (Author/TRRL)]]></description>
      <pubDate>Sat, 30 Nov 1985 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/213298</guid>
    </item>
    <item>
      <title>WHEEL TREAD PROFILE AS A RAIL VEHICLE DESIGN PARAMETER</title>
      <link>https://trid.trb.org/View/205748</link>
      <description><![CDATA[Rail vehicle running gear must satisfy conflicting requirements for good response and stability on tangent (straight) track and good guidance in curves.  A frequently overlooked characteristic, the wheel tread profile, can be designed in conjunction with the vehicle suspension to meet those objectives.  The dynamic performance of vehicles with low, moderate and high conicity wheel profiles is reported.  Design charts for stability and curving are utilized to finind optimum primary suspension values to accompany each wheel profile. The results demonstrate that high conicity wheel profiles offer significant overall performance advantages over low conicity wheel profiles.  However, the truck primary suspension must be designed to match the wheel profile in order to realize the potential improvement.]]></description>
      <pubDate>Tue, 30 Oct 1984 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/205748</guid>
    </item>
    <item>
      <title>SUSPENSION SYSTEM SYNTHESIS FOR MASS TRANSPORT VEHICLES WITH PRESCRIBED DYNAMICAL BEHAVIOR</title>
      <link>https://trid.trb.org/View/174529</link>
      <description><![CDATA[A synthesis procedure to produce redesign recommendations for the suspension of mass transport cars is presented. The objective of the study was to improve the performance of the suspension system under dynamic conditions, so as to yield resonant velocities outside the range of most frequent operation. It was found that only one of the two sections of the suspension need to be damped and the corresponding damping value was obtained via a Root Locus analysis.]]></description>
      <pubDate>Wed, 28 Apr 1982 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/174529</guid>
    </item>
    <item>
      <title>A RESEARCH AND DEVELOPMENT PROGRAM FOR THE URBAN GRAVITY- VACUUM-TRANSIT SYSTEM</title>
      <link>https://trid.trb.org/View/132170</link>
      <description><![CDATA[THE PROGRAM IS DIRECTED TOWARD THE SOLUTION OF THE PROBLEMS OF THE GRAVITY-VACUUM-TRANSIT (GVTS) IN FOUR CRITICAL AREAS: CONTROL SYSTEM AND VALVE DEVELOPMENT, WHEEL- RAIL INTERACTION, SUSPENSION DYNAMICS, AND RAIL ALIGNMENT. THE PROGRAM CONSISTS OF TWO PHASES WHICH ARE OUTLINED IN DETAIL. THE TENTATIVE BUDGETARY ESTIMATE INCLUDES THE MAJOR PORTION OF THE PROGRAM DESCRIBED AS PHASE II IN THE REPORT. THE R & D PROGRAM IS LIMITED TO TECHNOLOGICAL REQUIREMENTS OF THE SYSTEM; NO ATTEMPT WAS MADE TO FORMULATE A PROGRAM FOR DETERMINING ITEMS SUCH AS CAPITAL INVESTMENT COSTS AND OPERATING AND MAINTENANCE COSTS. ANALYSES AND TESTING OF THE UNIQUE SUSPENSION SYSTEM ARE RECOMMENDED, INCLUDING DEVELOPMENT TESTS ON COMPONENTS OF THE SUSPENSION SYSTEM AS WELL AS ANALYSES OF THE DYNAMIC RESPONSE CHARACTERISTICS OF BOTH THE MARK 4B GVT SYSTEM AND THE FOUR-CAR PROTOTYPE SYSTEM, AND POTENTIAL DYNAMIC INTERACTION PROBLEMS DUE TO EARTHQUAKE DISTURBANCES. /UMTA/]]></description>
      <pubDate>Sun, 03 Jan 1982 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/132170</guid>
    </item>
    <item>
      <title>EQUIPMENT AND MAINTENANCE OF DEMAND-RESPONSIVE TRANSPORTATION SYSTEMS. SPEAKER 5</title>
      <link>https://trid.trb.org/View/34786</link>
      <description><![CDATA[Comments are made (based on discussions and surveys made in the parcel, light air cargo, and passenger demand-responsive transportation systems) on the need for, and the design and use of a diversified-use vehicle (DUV).  The DUV is a vehicle that can be used for the ground transportation of one or more of the following: able-bodied passengers, handicapped persons, local parcel delivery, and light air-cargo parcels.  The desirable vehicle design was identified as a van type vehicle that had the driver in front, a luggage and cargo carriage in the rear compartment over a rear-mounted power plant and transmission.  To these must be added the safety dicates of the U.S. Department of Transportation.  The vehicle will incorporate the following basic points; unitized construction; 116-in. wheel base; front-wheel power steering; free-float suspension on all 4 wheels of a 4-wheeled vehicle; conventional oil over air suspension; 4-doors; power disc brakes for all 4 wheels and 12-in. rotors; 15-in. steel wheels and medium profile tires; 6-cylinder gasoline engine coupled to a 3-speed automatic transmission; bolt-on panels where possible and none if unitized construction; capacity for a maximum of driver and 6 forward-facing passengers; capacity for at least 500 lb of cargo in addition to passengers; and rear-mounted power plant and transmission.]]></description>
      <pubDate>Thu, 03 Dec 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/34786</guid>
    </item>
    <item>
      <title>TRANSIT TRUCK TEST PROGRAM</title>
      <link>https://trid.trb.org/View/131859</link>
      <description><![CDATA[THE PROGRAM DISCUSSED WAS ORIGINATED TO DETERMINE HOW THE OPERATIONAL CHARACTERISTICS OF A RAILED VEHICLE MIGHT BE IMPROVED. A PRIMARY OBJECTIVE WAS TO DEVISE A MEANS OF PROVIDING A GOOD RIDE FOR PASSENGERS ON WESTINGHOUSE COMPANY'S WABCO RAPID TRANSIT TRUCK THROUGH HYDRAIR SUSPENSION AND TRUCK COMPONENTS. THE REDUCTION OF WHEEL AND RAIL WEAR AND THE REDUCTION OF NOISE LEVEL WERE ALSO OF UTMOST INTEREST. ANOTHER MAJOR CONCERN OF THE PROJECT WAS THE INVESTIGATION OF THE REDUCTION OF NOSING OR OSCILLATION OF THE TRUCK ABOUT THE CENTERPIN THROUGH THE USE OF A TORQUE PROPORTIONING DIFFERENTIAL AND WHEEL TREAD SHAPE. THE COMPANY DETERMINED THAT TRUCK OPERATION COULD BE IMPROVED IN A NUMBER OF WAYS BY ALLOWING THE WHEELS ON AN AXLE TO ROLL AT THEIR DESIRED SPEED, ESPECIALLY WHEN OPERATING IN A CURVE. DIFFERENTIAL TESTS PROVED THAT, IN A RAIL SYSTEM, ONE WHEEL COULD TRANSMIT AT LEAST 3.4 TIMES THE TORQUE TO THE ADJACENT WHEEL WITHOUT ALLOWING THE OTHER WHEEL TO CHANGE ITS RATE OF SPEED. THE ADVANTAGES OF THIS CONCEPT ARE DISCUSSED. HYDRAIR SUSPENSION, BASICALLY A HYDRO-PNEUMATIC SPRING PRODUCING A NON-LINEAR SPRING RATE COMBINED WITH THE DAMPING WHICH OCCURS WHENEVER MOTION OCCURS, WAS APPLIED TO PROVIDE A STIFFENING ACTION WHERE THE LOAD INCREASES, THUS REDUCING THE ROLL TENDENCY OF THE CAR BODY AND PROVIDING A MORE CONSTANT NATURAL FREQUENCY BETWEEN THE EMPTY AND LOADED CONDITIONS. THE VERTICAL RIDE EXPERIENCED IN THE CAR WAS VERY STABLE PROVIDING VERY SMALL ROLL AND YAW AMPLITUDES IN THE LATERAL FORCE TO THE PASSENGER; THERE WAS PRACTICALLY NO PITCHING MOTION IN THE CAR. IN THE AREA DIRECTLY OVER THE CENTERPIN, HOWEVER, THE FLOOR WAS SUBJECT TO A VIBRATION STEMMING FROM THE SHRINKAGE OF A NON-STANDARD SUSPENSION BEARING. THE FAILURE OF THE SUSPENSION BEARING WAS NOT INHERENT IN THE DESIGN OF THE TRUCK OR OF THE HYDRAIR SUSPENSION SYSTEM PRINCIPLE. /UMTA/]]></description>
      <pubDate>Fri, 09 Oct 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/131859</guid>
    </item>
    <item>
      <title>THE RELIABILITY OF "RIPOMETER" MEASUREMENTS</title>
      <link>https://trid.trb.org/View/159543</link>
      <description><![CDATA[Correct adjustment of the wheel suspension geometry in relation to the axles of the vehicle is of great importance and should be checked as part of the routine testing of vehicles in accordance with paragraph 29 of the German highway code.  A differentiated analysis of toe-in and camber is too comprehensive for this.  Therefore the so-called wheel course is determined and evaluated as a summary characteristic value.  However, the reliability of the wheel course testers used by the TUEV has never been subjected to a detailed check.  The following problem areas were examined: the measuring principle on which the instrument is based (power or path measurement); the effect of vehicle parameters (type of tyre, loading of the vehicle) on the result of the measurement; effect of factors specific to the instrument on the result.  A model was built for clarifying the effect of the possible parameters of the result of the measurement.  This was followed by practical tests with vehicles of different design and having different wheel adjustment on a number of test rigs.  The results obtained from the theoretical and practical tests have shown that, other conditions being equal, power and path measurements provide results which are sometimes difficult to compare; since with power measurement on one axle the results are also affected by geometric errors on the other axle, preference should be given to path measurement. (TRRL)]]></description>
      <pubDate>Wed, 15 Apr 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/159543</guid>
    </item>
    <item>
      <title>TRANSIT VEHICLE TRUCK CONCEPTS - REPORT NO 5</title>
      <link>https://trid.trb.org/View/132192</link>
      <description><![CDATA[WIDE-GAUGE TRUCKS WERE MANUFACTURED AND TESTED UNDER SERVICE CONDITIONS IN THE BAY AREA RAPID TRANSIT (BART) SYSTEM TO APPRAISE THEIR SAFETY, RIDE QUALITY, AND MAINTENANCE AND TO GATHER DATA PARTINENT TO CONSTRUCTION OF THE TRUCK AND SPRING SUSPENSION FOR BART. DESIGNS SUBMITTED BY FIVE PRIVATE CONTRACTORS WERE TESTED. EACH TRUCK PROTOTYPE CARRIED THE SENSING EQUIPMENT NECESSARY FOR THE OPERATION OF AUTOMATIC TRAIN CONTROL, THE FIVE DESIGNS EMPLOYED VARYING CONCEPTS FOR PROPULSION AND BRAKING; UNIFORM POWER COLLECTORS WERE PROVIDED FOR EITHER 1000-VDC OR -VAC POWER SOURCES. AS A RESULT OF THE TESTS, A LIST OF SPECIFICATIONS WAS COMPILED AS REQUIREMENTS STANDARDS TO BE MET BY BART SYSTEM TRUCKS. /UMTA/]]></description>
      <pubDate>Mon, 23 Feb 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/132192</guid>
    </item>
    <item>
      <title>ROCKWELL TRUCK DEVELOPMENT FOR BAY AREA RAPID TRANSIT DISTRICT</title>
      <link>https://trid.trb.org/View/131856</link>
      <description><![CDATA[THIS REPORT DESCRIBES THE DESIGNING, MANUFACTURING, AND DEMONSTRATION OF A CARSET OF 5'6" GAUGE EXPERIMENT TRUCKS FOR POSSIBLE USE IN THE BART SYSTEM. OBJECTIVES OF TRUCK DESIGN INCLUDED THE FOLLOWING: (A) RELIABLE RIDE PERFORMANCE SUPERIOR TO THAT OF CONTEMPARY RAIL TRANSIT TRUCKS FOR SPEEDS UP TO 80 MPH SERVICE; (B) CONTROL OF SOUND AND VIBRATION TO ACCEPTABLE LEVELS; (C) ACCOMMODATION OF A WIDE RANGE OF AUXILLIARY TRUCK EQUIPMENT; AND (D) FEATURES WHICH EXTEND THE STATE OF THE ART OF RAILCAR SUSPENSION SYSTEMS. MANY TESTS, TESTING STRAIN GAUGE, TRUCK SIDE FRAME STRESS, LATERAL FORCE DISPLACEMENT, AND STRUCTURAL COMPONENTS, RESULTED IN THE DESIGN OBJECTIVES BEING MET WITH A HIGH DEGREE OF SATISFACTION. THE TESTS ARE DESCRIBED IN DETAIL IN THE REPORT; MANY ARE ILLUSTRATED AND GRAPHED. /UMTA/]]></description>
      <pubDate>Tue, 03 Feb 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/131856</guid>
    </item>
    <item>
      <title>DESIGN AND VALIDATION OF VARIABLE RATE PNEUMATIC SPRINGS</title>
      <link>https://trid.trb.org/View/160538</link>
      <description><![CDATA[This paper provides information on theory and design methods used to tailor pneumatic spring rate and natural frequency. Equations utilized in the design procedure are presented, and the interaction of the important variables is discussed. The vital role of laboratory testing and validation is emphasized.  Although the paper is restricted to pneumatic spring design, peripheral equipment such as leveling valves and auxiliary reservoirs are addressed.]]></description>
      <pubDate>Tue, 30 Dec 1980 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/160538</guid>
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