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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 Slippage of the Driving Wheels of a Tractor in a Cultivated Soil and Stubble</title>
      <link>https://trid.trb.org/View/908335</link>
      <description><![CDATA[The article analyses the relation between the slippage of driving wheels and the traction characteristics of a tractor. The indicators for estimating wheel slippage are a coefficient of tractor weight force utilization for driving wheel grip and a coefficient of the ratio of trailer and tractor mass. The dependencies of wheel slippage on the weight utilization coefficient of tractors and the ratio of trailer and tractor mass are reviewed. The presented and carried out analysis of the equations of weight utilization coefficient determined its dependencies on rolling resistance coefficients of a means of transport, working speed, and acceleration on the mass ratio of a trailer and tractor mp/mt. The results of experimental research on acceleration and constant speed regimes in a cultivated soil and stubble are presented. The dependencies of slippage on the ratio of trailer and tractor mass and the weight utilization coefficient of a tractor and trailer are viewed.]]></description>
      <pubDate>Mon, 25 Jan 2010 08:07:59 GMT</pubDate>
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      <title>EVALUATING TRUCK SPEEDS ON VERTICAL ALIGNMENTS</title>
      <link>https://trid.trb.org/View/656920</link>
      <description><![CDATA[Studies show that the more a vehicle deviates from the average speed, the greater its chances are of becoming involved in an accident.  To avoid speed differences on freeways (motorways), a traffic engineer always tries to realize gentle slopes on which trucks are able to maintain their speed.  If that is not possible, extra lanes are advisable in most cases.  In order to provide useful information for the design and evaluation of speed behavior of heavy vehicles on vertical alignments, the Dutch Ministry of Transport has developed a simple computer program.  This program calculates velocities that a vehicle is able to reach at any vertical alignment.  In the Dutch road design practice this program is particularly useful in evaluating the deceleration of trucks on gradients adjacent to highway tunnels underneath major waterways and to determine the speed of truck acceleration on freeway entries (especially in the case of ramp metering).  In accordance with the development of the computer program a typical truck for freeway design was determined.  The power to mass ratio of this truck is 6.4 kW/ton, which is somewhat greater than ratios found in most of the current guidelines for road design.]]></description>
      <pubDate>Wed, 28 Jun 2000 00:00:00 GMT</pubDate>
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      <title>INTERRELATIONSHIP OF VEHICLE MASS RATIO WITH ACCIDENTS IN MIXED TRAFFIC</title>
      <link>https://trid.trb.org/View/34376</link>
      <description><![CDATA[In mixed road traffic, vehicles of different masses may collide.  In general, the occupants of the heavier vehicle have a greater chance of survival.  By adopting the front structure characteristics, the chance of survival for the occupants in the lighter vehicle can be improved (compatibility).  But this adaptation can only be provided if the relevant vehicle mass ratios are known, and if it is known as well, which will be the lightest vehicle reasonably to be taken into account of in connection with these considerations.  For this purpose, the mass distribution of the vehicles involved in road traffic is statistically calculated; from these figures, the probability of collision of vehicles of a certain mass ratio can be derived.]]></description>
      <pubDate>Wed, 03 Dec 1975 00:00:00 GMT</pubDate>
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      <title>DYNAMIC BEHAVIOR OF EMBEDDED FOUNDATION-SOIL SYSTEMS</title>
      <link>https://trid.trb.org/View/127539</link>
      <description><![CDATA[DEVELOPMENT OF THEORETICAL SOLUTIONS TO THE PROBLEMS OF DYNAMIC INTERACTION BETWEEN FOUNDATION AND UNDERLYING SOILS IS DISCUSSED WITH A VIEW TO IDEALIZATIONS AND UNCERTAINTIES ASSOCIATED WITH THE THEORIES, WITH A PARTICULAR EMPHASIS ON THE EFFECT OF EMBEDMENT ON THE INTERACTION. AN EXPERIMENTAL INVESTIGATION TO STUDY THE DYNAMIC BEHAVIOR OF EMBEDDED FOUNDATION-SOIL SYSTEMS IS DESCRIBED. BASED ON SMALL-SCALE MODEL TESTS ON FOOTINGS OF VARIOUS SIZES AND SHAPES, EVALUATION IS MADE OF THE EFFECT OF EMBEDMENT DEPTH, MASS RATIO, AND FOUNDATION SHAPE ON THE DYNAMIC RESPONSE OF THE SYSTEM. IT IS FOUND THAT THE AMPLITUDE OF MOTION OF THE EMBEDDED FOUNDATION IS GREATLY REDUCED BY THE ADDITIONAL SHEARING RESISTANCE ALONG SIDES OF THE FOUNDATION AND A SHIFT IN THE CONTACT PRESSURE DISTRIBUTION. EMBEDMENT IS FOUND, HOWEVER, TO HAVE NO APPRECIABLE EFFECT ON THE RESONANT FREQUENCY OF THE SYSTEM. THE SYSTEM WITH A HIGHER MASS RATIO PRODUCES A GREATER AMPLITUDE FOR A GIVEN DEPTH OF EMBEDMENT, BUT THE EFFECT OF MASS RATIO BECOMES SMALLER WITH INCREASING EMBEDMENT DEPTH. THE EFFECTS OF EMBEDMENT DEPTH, MASS RATIO, AND FOUNDATION SIZE ARE EXPRESSED IN TERMS OF TWO NEWLY DEFINED DIMENSIONLESS PARAMETERS, THE AMPLITUDE REDUCTION COEFFICIENT AND THE EMBEDMENT FACTOR, BY MEANS OF WHICH THE DYNAMIC RESPONSE OF EMBEDDED FOUNDATIONS CAN BE ADEQUATELY DETERMINED. /AUTHOR/]]></description>
      <pubDate>Mon, 03 May 1971 00:00:00 GMT</pubDate>
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