Influence of wheel/rail tangential traction force on thermal cracking of railway wheels

Wear ◽  
2012 ◽  
Vol 289 ◽  
pp. 112-118 ◽  
Author(s):  
Kazuyuki Handa ◽  
Fumiko Morimoto
Keyword(s):  
Traction Force ◽  
Thermal Cracking ◽  
Tangential Traction ◽  
Railway Wheels

scholarly journals Theoretical Studies of Forwarder Productivity with Limited Impact on Soils

2021 ◽  
pp. 101-116
Author(s):  
Olga N. Burmistrova ◽  
◽  
Alexey A. Prosuzhih ◽  
Egor G. Khitrov ◽  
Olga A. Kunitskaya ◽  
...  
Keyword(s):  
Practical Interest ◽  
Traction Force ◽  
Theoretical Studies ◽  
Limited Impact ◽  
Wood Harvesting ◽  
Stage Of Development ◽  
Logging Industry ◽  
First Pass ◽  
Tangential Traction ◽  
Machine Systems

Wheeled forest machines currently dominate the logging industry in Russia and in the world. Every year in Russia, the share of machine-made wood harvesting using Scandinavian technology increases, which involves felling trees, delimbing, and bucking them at a swath. Moreover, this technology is used not only for conventional two-machine systems with harvester and forwarder. In some regions of Siberia three-machine systems are gaining popularity. They consist of a feller-buncher, a swath processor, and a forwarder for skidding obtained logs. The issue of increasing the efficiency of forwarders is relevant for the timber industry. Its solving is possible on the basis of a comprehensive assessment of design solutions with the use of modern modeling and process optimization tools at the stage of development design. This approach requires deep theoretical and experimental research and is of great scientific and practical interest. When determining the maximum volume of skidded wood, the following machine limitations are considered: by bearing capacity; by tangential traction force; by the traction of the mover with the soil (tangential traction force should not exceed the traction force of the mover with the driving surface – the soil of the logging site). Besides this, there are recommendations to limit the weight of the skidder with the load, based on the permissible track depth after the first pass of the machine; it is believed that this figure should not exceed 20 cm. This statement is supported by the results of studies of the track development under the cyclic influence of the wheel mover (that is when the forwarder repeatedly passes the same section of the portage). This raises the question of forwarder productivity in the skidding operation with the regard to the track depth limitation. For citation: Burmistrova O.N., Prosuzhih A.A., Khitrov E.G., Kunitskaya O.A., Luneva E.N. Theoretical Studies of Forwarder Productivity with Limited Impact on Soils. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 3, pp. 101–116. DOI: 10.37482/0536-1036-2021-3-101-116

Thermal cracking of railway wheels: Towards experimental validation

2016 ◽  
Vol 94 ◽  
pp. 409-420 ◽  
Author(s):  
Sara Caprioli ◽  
Tore Vernersson ◽  
Kazuyuki Handa ◽  
Katsuyoshi Ikeuchi
Keyword(s):  
Experimental Validation ◽  
Thermal Cracking ◽  
Railway Wheels

scholarly journals Reducing the soil structure destruction along the rut and increasing the traction properties of the tractor by using the rear grouser of the track link

2021 ◽  
Vol 282 ◽  
pp. 07009
Author(s):  
V.N. Kozhanov ◽  
M.A. Rusanov ◽  
M.G. Shtyka ◽  
V.S. Kukhar
Keyword(s):  
Traction Force ◽  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Support Surface ◽  
Horizontal Deformation ◽  
Tangential Traction ◽  
Soil Destruction ◽  
Agricultural Tractors ◽  
Agricultural Tractor ◽  
Traction Power

The traditionally used mixed grouser of the metal track link causes a decrease in the traction qualities of the agricultural tractor. The use of a rear grouser on the track link, in our opinion, will significantly improve the traction properties of an agricultural tractor with a metal track and reduce the soil destruction. When the rear grouser is immersed in the soil, an additional horizontal deformation of the soil occurs, which changes the law of horizontal deformation distribution along the support surface of the trackdrive, which ensures the alignment of the link shares in the implementation of the tangential traction force. This leads not only to a reduction in the trackdrive skidding, but also to a reduction in tractor rolling losses. Comparative tests of the T-4A tractor with a serial track, and a track on which links the front grousers were removed showed that the maximum traction power increases from 59 to 65 kW, the skidding with a hook load of 40 kN decreases from 14.6 to 9.4%, the rolling resistance coefficient decreases from 0.093 to 0.072, eliminates the “scissors” effect, which will reduce the number of erosive-dangerous particles in the track trace to 30...40%, which is 5.6...4.25 times less than in agricultural tractors with a mixed grouser, which confirms the effectiveness of their use.

Effects of Residual Stress and Traction Force on the Contact Fatigue Life of Railway Wheels

2006 ◽  
Vol 326-328 ◽  
pp. 1067-1070
Author(s):  
Jung Won Seo ◽  
Hyun Mu Hur ◽  
Sung Tae Kwon ◽  
Jae Boong Choi ◽  
Young Jin Kim
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Contact Fatigue ◽  
Traction Force ◽  
Railway Wheel ◽  
Traction Coefficient ◽  
Contact Fatigue Life ◽  
Railway Wheels ◽  
Effect Of Surface ◽  
Surface Removal

Damage often occurs on the surface of railway wheels due to wheel-rail contact fatigue. Since the wheel failure can cause derailment causing the loss of life and property, it should be removed prior to the wheel failure. The effect of surface removal on contact fatigue life has been investigated by many researchers, however, the effects of residual stress and traction force have not been reported yet. The railway wheel reserves the initial residual stress due to the manufacturing process, and this residual stress is changed by the thermal stress induced by braking. Also, the traction force is usually applied along with residual stress on wheels of locomotive and electric motor vehicle. In this study, the effect of surface removal on the contact fatigue life for a railway wheel has been evaluated by applying the rolling contact fatigue test. Also, the effect of traction force and change of residual stress on the contact fatigue life has been estimated by applying finite element analysis. It is found that the residual stress is a dominant factor determining the surface removal depth as far as the traction coefficient is less than 0.15. If the traction coefficient is greater than 0.2, however, the surface removal depth is observed to be independent on the residual stress.

Soil/Tire Interaction Analysis Using FEM and FVM

2005 ◽  
Vol 33 (1) ◽  
pp. 38-62 ◽  
Author(s):  
S. Oida ◽  
E. Seta ◽  
H. Heguri ◽  
K. Kato
Keyword(s):  
Large Scale ◽  
Interaction Analysis ◽  
Yield Criterion ◽  
Surrounding Medium ◽  
Flow Analysis ◽  
Measurement Data ◽  
Traction Force ◽  
Elastoplastic Material ◽  
The Road ◽  
Soil Flow

Abstract Vehicles, such as an agricultural tractor, construction vehicle, mobile machinery, and 4-wheel drive vehicle, are often operated on unpaved ground. In many cases, the ground is deformable; therefore, the deformation should be taken into consideration in order to assess the off-the-road performance of a tire. Recent progress in computational mechanics enabled us to simulate the large scale coupling problem, in which the deformation of tire structure and of surrounding medium can be interactively considered. Using this technology, hydroplaning phenomena and tire traction on snow have been predicted. In this paper, the simulation methodology of tire/soil coupling problems is developed for pneumatic tires of arbitrary tread patterns. The Finite Element Method (FEM) and the Finite Volume Method (FVM) are used for structural and for soil-flow analysis, respectively. The soil is modeled as an elastoplastic material with a specified yield criterion and a nonlinear elasticity. The material constants are referred to measurement data, so that the cone penetration resistance and the shear resistance are represented. Finally, the traction force of the tire in a cultivated field is predicted, and a good correlation with experiments is obtained.

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