scholarly journals The results of modeling the physical processes of interaction of a pneumatic tire with a supporting surface to determine the forces acting in the contact patch

2020 ◽  
Vol 832 ◽  
pp. 012012
Author(s):  
A N Sova ◽  
G S Mazlumyan ◽  
O V Egorov ◽  
S S Shadrin ◽  
V A Sova
Keyword(s):  
Physical Processes ◽  
Supporting Surface ◽  
Pneumatic Tire ◽  
Contact Patch

The Three-Dimensional Contact Patch Stress Field of Solid and Pneumatic Tires

1992 ◽  
Vol 20 (1) ◽  
pp. 3-32 ◽  
Author(s):  
M. G. Pottinger
Keyword(s):  
Boundary Condition ◽  
Friction Coefficient ◽  
Stress Field ◽  
Three Dimensional ◽  
Vehicle Control ◽  
Operating Conditions ◽  
Pneumatic Tire ◽  
Contact Patch ◽  
Control Forces ◽  
Pneumatic Tires

Abstract Contact patch (footprint) physics is fundamental to the generation of vehicle control forces, tire and road wear, and tire structural mechanics. Footprint physics depends strongly on tire design, pavement topography, and operating conditions. This paper discusses the three-dimensional contact patch stress field of two generic tire types: solid and pneumatic. The discussion is limited to the comparison of the static and free rolling states of both tire types, examination of the effect of the bead-rim boundary condition in the pneumatic tire, and a brief look at the effect of the friction coefficient and viscoelasticity on the solid tire. The discussion is based on experimental results for a smooth-treaded urethane solid tire and a low-pull-force smooth-treaded radial which are assumed to generally represent solid and pneumatic tires. The results obtained offer significant guidance to those who are attempting to mathematically model tires, understand wear, and comprehend the physics of the tire contact patch.

scholarly journals DEVELOPMENT OF THE FORWARDER ARTICULATION JOINT

2021 ◽  
Vol 10 (4) ◽  
pp. 217-226
Author(s):  
Vladislav Klubnichkin ◽  
Evgeniy Klubnichkin ◽  
Aleksey Gorbunov ◽  
Denis Druchinin
Keyword(s):  
Steering System ◽  
Model Parameters ◽  
Supporting Surface ◽  
Contact Patch ◽  
Solid Models ◽  
The Moment ◽  
Main Components ◽  
Moment Of Resistance ◽  
Semi Empirical

The article presents a structural hydraulic diagram of the steering system of the developed forwarder. The main components that make up the steering of the machine are described. The scheme of the articulated joint was selected and the radius and the corridor of the forwarder's turn were determined. In the work, a kinematic analysis of the articulated joint of the forwarder was carried out, which is the determination of the limiting angles of folding of the articulation unit and the stroke of the hydraulic power cylinders according to the developed electronic solid models. The moment of resistance required to fold the car of full weight in place on a solid supporting surface with a high coefficient of adhesion, taking into account the interaction of tires with the supporting surface, was determined using the semi-empirical model of Packa MF-Tire 6.1. Model parameters for tire 750/55-26.5. A dynamic model of a forwarder has been created with the following features: all links of the dynamic system are absolutely rigid; all wheels are not braked and rotate; there is no friction in the hinges; the load (assortments) is modeled absolutely rigid by a single body; the simulation was done for a fully laden forwarder; axle differentials are not locked (free). The vertical loads in the contact patch of the front and rear axles, as well as lateral reactions in the contact patch of the front and rear axles are presented

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

Sampling and analysis of the air-water interface with SEM and EDS of microlayers

1989 ◽  
Vol 47 ◽  
pp. 1004-1005
Author(s):  
Randall W. Smith ◽  
John Dash
Keyword(s):  
Heavy Metals ◽  
Surface Microlayer ◽  
Surface Films ◽  
Water Interface ◽  
Physical Processes ◽  
Infrared Spectroscopic Analysis ◽  
Eds Analysis ◽  
Air Water Interface ◽  
Significant Area ◽  
Bulk Chemical

The structure of the air-water interface forms a boundary layer that involves biological ,chemical geological and physical processes in its formation. Freshwater and sea surface microlayers form at the air-water interface and include a diverse assemblage of organic matter, detritus, microorganisms, plankton and heavy metals. The sampling of microlayers and the examination of components is presently a significant area of study because of the input of anthropogenic materials and their accumulation at the air-water interface. The neustonic organisms present in this environment may be sensitive to the toxic components of these inputs. Hardy reports that over 20 different methods have been developed for sampling of microlayers, primarily for bulk chemical analysis. We report here the examination of microlayer films for the documentation of structure and composition.Baier and Gucinski reported the use of Langmuir-Blogett films obtained on germanium prisms for infrared spectroscopic analysis (IR-ATR) of components. The sampling of microlayers has been done by collecting fi1ms on glass plates and teflon drums, We found that microlayers could be collected on 11 mm glass cover slips by pulling a Langmuir-Blogett film from a surface microlayer. Comparative collections were made on methylcel1ulose filter pads. The films could be air-dried or preserved in Lugol's Iodine Several slicks or surface films were sampled in September, 1987 in Chesapeake Bay, Maryland and in August, 1988 in Sequim Bay, Washington, For glass coverslips the films were air-dried, mounted on SEM pegs, ringed with colloidal silver, and sputter coated with Au-Pd, The Langmuir-Blogett film technique maintained the structure of the microlayer intact for examination, SEM observation and EDS analysis were then used to determine organisms and relative concentrations of heavy metals, using a Link AN 10000 EDS system with an ISI SS40 SEM unit. Typical heavy microlayer films are shown in Figure 3.

Distributed Modeling Of Building Systems Through Cyber-Physical Integration

2019 ◽  
pp. 12-17
Keyword(s):  
Data Structure ◽  
Operating Conditions ◽  
Physical Models ◽  
Distributed Model ◽  
Physical Processes ◽  
Distributed Modeling ◽  
Distributed Models ◽  
Operating Modes ◽  
Building Systems ◽  
Important Practical Application

This article describes the proposed approaches to creating distributed models that can, with given accuracy under given restrictions, replace classical physical models for construction objects. The ability to implement the proposed approaches is a consequence of the cyber-physical integration of building systems. The principles of forming the data structure of designed objects and distributed models, which make it possible to uniquely identify the elements and increase the level of detail of such a model, are presented. The data structure diagram of distributed modeling includes, among other things, the level of formation and transmission of signals about physical processes inside cyber-physical building systems. An enlarged algorithm for creating the structure of the distributed model which describes the process of developing a data structure, formalizing requirements for the parameters of a design object and its operating modes (including normal operating conditions and extreme conditions, including natural disasters) and selecting objects for a complete group that provides distributed modeling is presented. The article formulates the main approaches to the implementation of an important practical application of the cyber-physical integration of building systems - the possibility of forming distributed physical models of designed construction objects and the directions of further research are outlined.

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