Author: J. G. ThomsonPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A Study of Some Factors Influencing Vehicle Mobility in Snow
Author: J. G. ThomsonSTUDY OF SOME PHASES OF THE SNOW/VEHICLE INTERACTION, VOL. 3 - VEHICLE MOBILITY TRAILS, WINTER, 1955-56
Author: CANADA. DEFENCE RESEARCH BOARD. DIRECTORATE OF ENGINEERING RESEARCH.Publisher:
ISBN:
Category :
Languages : en
Pages : 39
Book Description
Wheels and Tracks in Snow
Author: Paul W. RichmondPublisher:
ISBN:
Category : Motor vehicles
Languages : en
Pages : 48
Book Description
Some Factors Affecting the Vehicular Trafficability of Snow
Author: Robert W. GerdelPublisher:
ISBN:
Category : Snow
Languages : en
Pages : 13
Book Description
Mobility and Safety Impacts of Winter Storm Events in a Freeway Environment
Author: Keith K. KnappPublisher:
ISBN:
Category : Automobile driving in winter
Languages : en
Pages : 88
Book Description
Several factors influence a driver's decision to travel, choice of vehicle speed, and the safety of a particular trip. These factors include, among others, the trip purpose, time of day, traffic volumes, weather and roadway conditions, and the range of vehicle speeds on the roadway. The main goal of the research project summarized in this report was the investigation of winter storm event impacts on the volume, safety, and speed characteristics of interstate traffic flow.
Scaled Vehicle Mobility Factors (scale Model Tires in Snow).
Author: CARLO J. ROMAPublisher:
ISBN:
Category :
Languages : en
Pages : 77
Book Description
Tests were conducted in snow with six reducedscale tires. The tires covered a wide range of width-to-diameter ratios. The results are expressed in dimensionless terms and are applicable for a range of vehicle sizes and weights as well as a range of dry snow conditions. Tests described in previous reports have covered the flotation type of performance. Tests described herein cover the performance of two types of tires for the ground-supported (limited snow depth) type of performance and, also, the results of additional flotation tests. The complete flotation data, including that from previous years' tests, are summarized and further analyzed. Present data are limited to 4x4 vehicles with equal weight distribution. The possibility is shown that data for vehicle tests in sand can be interpreted in terms of performance in snow. Results of a preliminary snow survey, which can be used to predict vehicle performance in subarctic, below-thetree-line snow regions, are shown.
Developing a model for predicting snowpack parameters affecting vehicle mobility
Author: Roger H. BergerPublisher:
ISBN:
Category :
Languages : en
Pages : 33
Book Description
The presence of snow on the ground can impose limitations on the mobility of wheeled and tracked vehicles. Snow depth and density are the two most easily measured snow properties that can be related to mobility over snow. Existing models of snowpack accumulation and ablation processes and models of internal snowpack structure were examined to determine if a model of the snowpack can be developed for use in predicting the snow parameters that affect mobility. Simple models, such as temperature index models, do not provide sufficient snowpack details, and the more detailed models require too many measured inputs. Components of the various models were selected from a basis of a snowpack model for predicting snow properties related to mobility over snow. Methods of obtaining the input data from some components are suggested, and areas where more development is needed are described.
Improving the Mobility Performance of Tracked Vehicles in Deep Snow
Author: Anders BodinThe Measurement of Snow Properties for Mobility Applications: The Unfrozen Water Content
Author: W. L. HarrisonPublisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
The free water content of snow has been used in over-snow vehicle mobility studies only in a documentary manner. The free water content of snow is indicated by the terms dry, moist, wet, very wet, or slush. Throughout the range of conditions, the variation of free water obviously has a significant effect of the snow strength parameters used in vehicle performance evaluation. During a testing program this past winter (1983-1984) at the Keweenaw Research Center, which involved vehicles attempting to negotiate snow obstacles, free water content was measured and included as snow characterization data along with density, grain size, and snow temperature. Of particular interest to this paper was the difference in test results of two snow obstacles having the same classification of the two types of snow used to form the obstacles was measured, by calorimetry, to be 16% and 26%.
The Development of Snow Properties and Its Effect on Trafficability
Author: Gerald J. IrwinPublisher:
ISBN:
Category :
Languages : en
Pages : 59
Book Description
The properties of a given snowpack were monitored throughout a winter season in order to identify some of the factors most affecting vehicle mobility over snow. This activity was carried out as an aid to developing an improved snow classification system for purposes of mobility and to assess the use of snow strength testing devices as part of such a system. Snowpit data were collected at the Land Engineering Test Establishment, DND Ottawa, during the winter of 1976-77 in combination with penetrometer tests of snow strength and studies of the tractive performance of an RN25-35 tracked carrier. It was found that temperature and free water content are the snow factors which are highly transient while changes in depth, density, grain size distribution, grain shape, crustal layer and bearing strength are usually perceptible over a period of days to weeks. As the winter season progresses snow strength undergoes a general increase with snow density while snow temperature approaches uniformity and crusts become more numerous. Grain shape and size distribution are indicative of the stages of snow metamorphism. Penetrometer shortcomings are enumerated with a recommendation for greater automation in snow strength testing. Recommendations are also made for the most convenient environmental conditions for purposes of comparing the performance of vehicles. (Author).