Improvement of curving performance by expansion of gauge widening and additional measures

2011 ◽  
Vol 226 (2) ◽  
pp. 203-215 ◽  
Author(s):  
M Adachi ◽  
A Matsumoto
Keyword(s):  
Numerical Simulation ◽  
Inclination Angle ◽  
Lateral Force ◽  
Rolling Stock ◽  
Running Performance ◽  
Rail Corrugation ◽  
Lateral Forces ◽  
Curving Performance ◽  
Track Irregularity ◽  
Squeal Noise

Lateral forces between wheels and rails must be reduced in order that rolling stock runs safely and smoothly on curved tracks. The excessive lateral force will cause not only derailment of rolling stock but also destruction of tracks, rail corrugation, track irregularity, squeal noise and wear. It is important to reduce lateral force of wheels in curves, so new wheel-tread profiles and steerable bogie structures have been developed up to now, however, they cannot solve various problems in curving perfectly. In this article, the authors propose three methods for improvement of running performance on curves by using existing types of wheels and rails, and analyse the effects of three methods by numerical simulation. According to analytical results, the authors conclude that ‘expansion of gauge widening’, and ‘larger rail inclination angle of inner rail installation’ or ‘asymmetrically inclined grinding of inner rail head’ can get sufficient rolling radius difference, and are effective for improvement of running performance on curved tracks.

Development of a device for application of vertical and lateral forces on rail head for determination of scale of strain measurement circuits for measuring influence of rolling stock on track

2020 ◽  
pp. 50-55
Author(s):  
Darya Vladimirovna Rasshhepkina ◽  
◽  
Mariya Viktorovna Zimakova ◽  
Dmitriy Vladimirovich Beloborodov ◽  
◽  
...  
Keyword(s):  
Strain Measurement ◽  
Structural Strength ◽  
Lateral Force ◽  
Rolling Stock ◽  
Vertical Force ◽  
New Device ◽  
Rail Head ◽  
Lateral Forces ◽  
Axis Of Symmetry

On the basis of analytical method of studying devices for the application of forces on a rail head and numerical method of calculating structural strength the authors have developed a new device for loading the rail head by vertical and lateral forces. The device that simulates force of wheel influence on rail allows applying vertical force on the axis of symmetry and with the offset of ±20 mm simultaneously with lateral force. Due to the lightened collapsible frame and the existence of roller bearings the device is comfortable in use, which contributes to the increase of speed of tests on the influence on track and researches in this sphere.

scholarly journals A proposal to determine the distribution of lateral forces from loaded recycled plastic drainage kerbs

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Fin O’Flaherty ◽  
Fathi Al-Shawi
Keyword(s):  
Laboratory Test ◽  
Detailed Analysis ◽  
Test Data ◽  
Lateral Force ◽  
Measuring Device ◽  
Test Methodology ◽  
Lateral Forces ◽  
Test Conditions ◽  
Fit For Purpose ◽  
Construction Product

AbstractThis study presents a detailed analysis of the lateral forces generated as a result of vertically applied loads to recycled plastic drainage kerbs. These kerbs are a relatively new addition to road infrastructure projects. When concrete is used to form road drainage kerbs, its deformation is minimum when stressed under heavy axle loads. Although recycled plastic kerbs are more environmentally friendly as a construction product, they are less stiff than concrete and tend to deform more under loading leading to a bursting type, lateral force being applied to the haunch materials, the magnitude of which is unknown. A method is proposed for establishing the distribution of these lateral forces resulting from deformation under laboratory test conditions. A load of 400 kN is applied onto a total of six typical kerbs in the laboratory in accordance with the test standard. The drainage kerbs are surrounded with 150 mm of concrete to the front and rear haunch and underneath as is normal during installation. The lateral forces exerted on the concrete surround as a result of deformation of the plastic kerbs are determined via a strain measuring device. Analysis of the test data allows the magnitude of the lateral forces to the surrounding media to be determined and, thereby, ensuring the haunch materials are not over-stressed as a result. The proposed test methodology and subsequent analysis allows for an important laboratory-based assessment of any typical recycled plastic drainage kerbs to be conducted to ensure they are fit-for-purpose in the field.

Numerical Simulation of Heat Transfer Enhanced Tube Inserted Delta-Wing

2014 ◽  
Vol 535 ◽  
pp. 66-70
Author(s):  
Chen Hong Zhao ◽  
Yong Gang Lei
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Pressure Drop ◽  
Inclination Angle ◽  
Delta Wing ◽  
Delta Wings ◽  
Enhanced Tube ◽  
Delta Winglet

Heat transfer and resistance characteristics of a tube inserted delta-winglet (inclination angle is 10 °) are studied by numerical simulation. The results show that the delta-winglet enhance the heat transfer of the enhancement tube inserted delta-winglet and improve the PEC with modest pressure drop penalties. Compared with based tubes, the delta-wings structure enhance the heat transfer 19.52%-31%.

Dynamic Analysis of Steering Bogies

2016 ◽  
pp. 524-579 ◽  
Author(s):  
Arun K. Samantaray ◽  
Smitirupa Pradhan
Keyword(s):  
High Speed ◽  
Ride Comfort ◽  
Lateral Force ◽  
Rolling Stock ◽  
Wheel Wear ◽  
Active Steering ◽  
Load Fluctuation ◽  
Speed Up ◽  
Turning Radius ◽  
Secondary Suspension

Running times of high-speed rolling stock can be reduced by increasing running speed on curved portions of the track. During curving, flange contact causes large lateral force, high frequency noises, flange wears and wheel load fluctuation at transition curves. To avoid derailment and hunting, and to improve ride comfort, i.e., to improve the curving performances at high speed, forced/active steering bogie design is studied in this chapter. The actively steered bogie is able to negotiate cant excess and deficiency. The bogie performance is studied on flexible irregular track with various levels of cant and wheel wear. The bogie and coach assembly models are developed in Adams VI-Rail software. This design can achieve operating speed up to 360 km/h on standard gauge ballasted track with 150mm super-elevation, 4km turning radius and 460m clothoid type entry curve design. The key features of the designed bogie are the graded circular wheel profiles, air-spring secondary suspension, chevron springs in the primary suspension, anti-yaw and lateral dampers, and the steering linkages.

Centrifuge Modeling on Pile Behavior Subjected to Cyclic Lateral Loadings

2015 ◽  
Vol 764-765 ◽  
pp. 1209-1213
Author(s):  
Wen Yi Hung ◽  
Chung Jung Lee ◽  
Yu Ting Lin
Keyword(s):  
Pile Foundation ◽  
Lateral Force ◽  
Centrifuge Modeling ◽  
Strong Wind ◽  
Pile Head ◽  
The Past ◽  
Head Displacement ◽  
Lateral Forces ◽  
Design Guide ◽  
Centrifuge Models

Cyclic loadings would cause the failure of pile foundation which was leading to many studies in the past. In this study, 6 centrifuge models were conducted in the acceleration field of 80 g. In order to simulate the off-shore wind turbine foundation embedded in soft deposit and subjected to lateral forces such as strong wind and waves. The pile was embedded in the dry or saturated soil deposit, and the different elevation of lateral force was applied to the pile foundation. From the tests, it was found 1% of pile head displacement suggested in the design guide is conservative.

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