Uneven Load Distribution Between Mating Windings of Roll and Screw with Nut of Planetary Roller Drive

Dmitri Blinov; Mikhail Morozov

doi:10.7463/0914.0727121

A Modular Race Tire Model Concerning Thermal and Transient Behavior using a Simple Contact Patch Description

Tire Science and Technology ◽

10.2346/tire.13.410402 ◽

2013 ◽

Vol 41 (4) ◽

pp. 232-246

Author(s):

Timo Völkl ◽

Robert Lukesch ◽

Martin Mühlmeier ◽

Michael Graf ◽

Hermann Winner

Keyword(s):

Load Distribution ◽

Thermal Condition ◽

Transient Behavior ◽

Wheel Load ◽

Contact Patch ◽

Fundamental Parameters ◽

Dry Conditions ◽

Simple Contact ◽

Tire Forces ◽

Descriptive Set

ABSTRACT The potential of a race tire strongly depends on its thermal condition, the load distribution in its contact patch, and the variation of wheel load. The approach described in this paper uses a modular structure consisting of elementary blocks for thermodynamics, transient excitation, and load distribution in the contact patch. The model provides conclusive tire characteristics by adopting the fundamental parameters of a simple mathematical force description. This then allows an isolated parameterization and examination of each block in order to subsequently analyze particular influences on the full model. For the characterization of the load distribution in the contact patch depending on inflation pressure, camber, and the present force state, a mathematical description of measured pressure distribution is used. This affects the tire's grip as well as the heat input to its surface and its casing. In order to determine the thermal condition, one-dimensional partial differential equations at discrete rings over the tire width solve the balance of energy. The resulting surface and rubber temperatures are used to determine the friction coefficient and stiffness of the rubber. The tire's transient behavior is modeled by a state selective filtering, which distinguishes between the dynamics of wheel load and slip. Simulation results for the range of occurring states at dry conditions show a sufficient correlation between the tire model's output and measured tire forces while requiring only a simplified and descriptive set of parameters.

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Dynamic Service Placement and Load Distribution in Edge Computing

2020 16th International Conference on Network and Service Management (CNSM) ◽

10.23919/cnsm50824.2020.9269059 ◽

2020 ◽

Author(s):

Adyson Magalhaes Maia ◽

Yacine Ghamri-Doudane ◽

Dario Vieira ◽

Miguel Franklin de Castro

Keyword(s):

Load Distribution ◽

Edge Computing ◽

Service Placement

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Control System for Interconnected Electric Drives with an Electromechanical Torsion and Load Distribution

Vestnik MEI ◽

10.24160/1993-6982-2019-3-70-79 ◽

2019 ◽

Vol 3 (3) ◽

pp. 70-79

Author(s):

Igor S. Polyushchenkov ◽

Keyword(s):

Control System ◽

Load Distribution ◽

Electric Drives

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Comparative assessment of rubber steel cables for vertical mine hoists

MINING INFORMATIONAL AND ANALYTICAL BULLETIN ◽

10.25018/0236-1493-2020-7-0-85-93 ◽

2020 ◽

pp. 85-93

Author(s):

V. E. Perekutnev ◽

V. V. Zotov

Keyword(s):

Feasibility Study ◽

Carrying Capacity ◽

Load Distribution ◽

Comparative Assessment ◽

Life Extension ◽

Steel Cable ◽

Motion Stability ◽

Cable Length ◽

Steel Cables ◽

Mine Hoist

Operation of inhaul rubber steel cables in vertical mine hoisting is discussed. The research in the field of mine hoisting is reviewed, and the further R&D directions are identified. Some studies concern life extension of hoisting ropes. One of the promising trends seems to be application of belt pullers as inhaul cables, which can essentially enhance mine hoist efficiency. In the meanwhile, capabilities of rubber steel cables suffer from deficient attention. The performance capabilities of rubber steel cables of top manufacturers (Promkanat and SAG) are compared, and application ranges in vertical mine hoisting are determined for such cables. It is found that the Polish manufacturer’s rubber steel cables offer a wider range of application. The analysis shows that rubber steel cables can be used as inhaul cables of vertical mine hoisters. Rubber steel cables possess suitable characteristics and are capable to elevate considerable loads to various hoisting heights. In particular, the existing rubber steel cables ensure carrying capacity of hoists up to 20-25 t at the hoisting heights to 400-500 m and sometimes can elevate skips with tonnage of 10 t to a height up to 1000 m and more. The further feasibility study of operation of inhaul steel rubber cables in hoisting units should address motion stability of a puller on a driving drum, load distribution in ropes of base of rubber steel cables, validation of hoister design, adjustability of rubber steel cable length during its operation, etc.

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