Showing papers on "Bogie published in 2011"
TL;DR: In this article, a time-domain method for the simulation of general three-dimensional dynamic interaction between a vehicle and a curved railway track, accounting for a prescribed relative wheel-rail displacement excitation in a wide frequency range (up to several hundred Hz), is presented.
Abstract: A time-domain method for the simulation of general three-dimensional dynamic interaction between a vehicle and a curved railway track, accounting for a prescribed relative wheel-rail displacement excitation in a wide frequency range (up to several hundred Hz), is presented. The simulation model is able to capture the low-frequency vehicle dynamics simultaneously due to curving and the high-frequency track dynamics due to the excitation by, for example, the short-pitch corrugation on the low rail. The adopted multibody dynamics formulation considers inertia forces, such as centrifugal and Coriolis forces, as well as the structural flexibility of vehicle and track components. To represent a wheel/rail surface irregularity, isoparametric two-dimensional elements able to describe generally curved surface shapes are used. The computational effort is reduced by including only one bogie in the vehicle model. The influence of the low-frequency vehicle dynamics of the remaining parts of the vehicle is considered by pre-calculated look-up tables of forces and moments acting in the secondary suspension. For a track model taken as rigid, good agreement is observed between the results calculated with the presented model and a commercial software. The features of the model are demonstrated by a number of numerical examples. The influence of the structural flexibility of the wheelset and track on wheel-rail contact forces is investigated. For a discrete rail irregularity excitation, it is shown that the longitudinal creep force is significantly influenced by the wheelset eigenmodes. The introduction of a velocity-dependent friction law is found to induce an oscillation in the tangential contact force on the low rail with a frequency corresponding to the first anti-symmetric torsional mode of the wheelset. Further, under the application of driving moments on the two wheelsets and excitation by a discrete irregularity on the high rail, the frequency content of the tangential contact forces on the low rail is significantly influenced by the P2 resonance as well as by several wheelset eigenmodes.
47 citations
TL;DR: In this article, the authors investigated the nonlinear heuristic creep and flange-rail contact models of a full railway vehicle with a single bogie frame and two wheelsets.
Abstract: Analysis is performed on the hunting stability of a full railway vehicle system composed of a vehicle body, two bogie frames, and two wheelsets for each bogie frame. Incorporated into this analysis are the nonlinear heuristic creep and flange-rail contact models. The results show that the hunting speed is most sensitive to the primary longitudinal and lateral stiffnesses, and the nonlinear heuristic creep model plays a key role in confining the hunting speed within a physically reasonable range. Eigenanalysis is performed to investigate the dynamic behavior of the vehicle in the vicinity of the hunting speed. The results reveal that there exists not only the most dominant pair of complex conjugate roots, but also its shadowed roots. The roles of these two principal pairs of eigensolutions in the hunting motion are thoroughly explored via numerical studies using bifurcation analysis and an orbital representation. It is shown that the nonlinear hunting motions before the modal transition speed mainly refer to the principal mode, and those after the critical speed refer not only to the principal mode, but also to its shadowed mode, which supports the necessity of the dual-bogie railway vehicle model in the hunting analysis.
33 citations
TL;DR: In this paper, a GEP224 glass fiber/epoxy 4-harness satin woven composite was used to construct a GFRP composite bogie frame for urban subway train.
26 citations
TL;DR: In this paper, different configurations of vehicles facing obstacles when climbing along ramps of different longitudinal slope have been modeled and analyzed in order to investigate the influence of the position of the center of gravity and obstacle traversing speed.
25 citations
TL;DR: In this paper, a GFRP composite bogie frame has been designed and manufactured to be applied to the bogie of urban subway trains to evaluate the structural behavior, the compositebogie frame was manufactured using the autoclave curing method and tested under the critical load conditions; vertical loads and twisting load.
24 citations
Patent•
22 Jun 2011
TL;DR: In this article, a static load test table for a bogie of a railway vehicle is presented, which consists of a base, a stand column, a loading oil cylinder, a weighing and measuring table, a lifting guide rail, bottom measuring rail, a matched hydraulic system and a control system.
Abstract: The utility model provides a static load test table for a bogie of a railway vehicle. The static load test table is a comprehensive bogie testing device which integrates the wheel weighing with the three-dimensional rectangular coordinate size measuring. The device consists of a base, a stand column, a loading oil cylinder, a weighing and measuring table, a lifting guide rail, a bottom measuring rail, a matched hydraulic system and a control system. When the device works, the measuring table is automatically centered with the wheel due to the mutual action between the wheel and a wheel support, and each sensor reads data and compares the data with each set standard to automatically, exactly and efficiently measure the data such as the wheel base of the bogie of the railway vehicle, the parallelism degree of an axle, the size of the diagonal line of the axle, the inner side distance (wheel span) of the wheel, the heights of the four corners of a frame, the heights of the other points of an upper side and a lower side, the weight of the wheel, the loading vertical deformation quantity of a primary spring and the like, and automatically compute the depth of an adjusting washer of the primary spring. In order to improve the quality of the bogie of the railway vehicle and guarantee the safety of the high-speed rail transit, the utility model provides the advanced test device.
21 citations
1 Jan 2011
TL;DR: In this paper, a comparison between the axle box and bogie mounted accelerometers for the track condition monitoring by in-service high-speed trains is presented, where a method based on Kalman, band-pass, compensation filters are introduced to estimate the lateral and vertical track irregularities from the corresponding axle-box or bogie accelerometers.
Abstract: This paper is focused on a comparison between the axle-box and bogie mounted accelerometers for the track condition monitoring by in-service high-speed trains. A method based on Kalman, band-pass, compensation filters are introduced to estimate the lateral and vertical track irregularities from the corresponding axle-box or bogie accelerometers. Also, the rail vehicle dynamics software is used to analyse the estimated result and to verify the developed method. (6 pages)
19 citations
1 Jan 2011
TL;DR: In this paper, the authors describe approaches to the condition monitoring of suspension components in railway bogies developed at Politecnico di Milano, Dipartimento di Meccanica and their application to a high-speed rail vehicle.
Abstract: This paper describes approaches to the condition monitoring of suspension components in railway bogies developed at Politecnico di Milano, Dipartimento di Meccanica and their application to a high-speed rail vehicle. Two classes of FDI techniques are proposed and compared: model-free and model-based FDI. The two proposed FDI approaches were applied to the case of an ETR500 class high speed trailed car, and numerical experiments were carried out to assess their effectiveness. The next step of the research consists in the verification of the applicability of the methods to a real case and to this aim an experimental campaign was set-up on the high speed test train ETR 500-Y1 running on the Italian high speed railway network. The paper presents the results of the numerical analyses performed and provides information about the implementation of the CBM system on-board the experimental train. (6 pages)
19 citations
TL;DR: In this article, the dynamics of a bogie composed of two wheelsets and a frame are analyzed, where the bogie frame is joined to the wheelsets by means of a primary suspension system acting on the three principal directions, i.e., longitudinal, transverse and vertical.
Abstract: The present paper analyzes the dynamics of a bogie composed of two wheelsets and a frame. The bogie frame is joined to the wheelsets by means of a primary suspension system, acting on the three principal directions, i.e., longitudinal, transverse and vertical.
17 citations
1 Mar 2011
TL;DR: In this paper, the authors present some experimental results from a bogie-mounted instrumentation system designed to monitor a typical example of a shoegear assembly operated on the UK railway system.
Abstract: Electric railways collect power from the infrastructure via various current collection systems For high-voltage AC- and DC-powered railways, this is usually achieved using overhead electrification equipment and a train-borne pantograph The dynamics of such systems are well understood, and the systems are able to be operated under a range of conditions and speeds Lower-voltage DC-powered railways use a current collecting shoe as part of a shoegear system and track side electrification infrastructure in the form of a conductor rail The dynamics of such systems are equally as complex as those of overhead systems This is due to the interaction between the conductor rail and the track system, coupled with the dynamics of the conductor shoe assembly, which are mechanically linked with the bogie and axle systems The systems also collect high currents, and therefore maintaining an effective electrical contact is essential The interface between the conductor shoe and conductor rail is regulated through standards and guidelines However, there are numerous engineering challenges in the effective management of the whole system that have yet to be addressed The mechanical design of the system must balance the requirements of good fatigue life with appropriate impact strength Other issues such as removal of contaminants from the conductor rail surface and shoe wear also have an impact on the design This article presents some experimental results from a bogie-mounted instrumentation system designed to monitor a typical example of a shoegear assembly operated on the UK railway system The results indicate that the shoegear broadly performs in accordance with the design guidelines Several points of loss of contact were observed, and it is shown that the contact force between the conductor shoe and rail can be estimated The mean force was found to vary with third rail height, but a wide distribution of forces is found at any one height because of hysteresis in the shoegear Large, but short-term, forces and torques occur because of third rail irregularities and ramps
Patent•
28 Dec 2011
TL;DR: In this article, a railway vehicle bogie hanging natural vibration characteristic detection equipment, in particular a semi-vehicle mass simulation state-based test bed, is used to conduct a natural vibration frequency test in transverse, yawing, nodding and side rolling vibration modes.
Abstract: The invention relates to a railway vehicle bogie hanging natural vibration characteristic detection equipment, in particular to a semi-vehicle mass simulation state based bogie hanging natural vibration characteristic test bed The test bed is mainly composed of a test bed positioning and auxiliary supporting device, a test bed excitation loading device and a semi-vehicle mass simulation loading device; wherein the test bed positioning and auxiliary supporting device is fixedly connected onto a test bed concrete foundation, the test bed excitation loading device is fixedly connected with a construction member on the test bed positioning and auxiliary supporting device, the semi-vehicle mass simulation loading device is connected with the swing bolster or air spring of a bogie to be testedand is fixedly connected with the construction member on the test bed positioning and auxiliary supporting device, the test bed can utilize a mass block to load the bogie, so as to achieve the aim ofsimulating semi-vehicle mass; and an electro-hydraulic servo system cooperatively controls actuators in different directions, so as to excite the bogie to be tested, thus meeting the requirement of natural vibration frequency test in bogie frame transverse, yawing, nodding and side rolling vibration modes
TL;DR: In this paper, the authors evaluated the fatigue life and strength of a lightweight railway bogie frame made of glass fiber/epoxy 4-harness satin-woven composites.
Abstract: We describe the evaluation of the fatigue life and strength of a lightweight railway bogie frame made of glass fiber/epoxy 4-harness satin-woven composites. To obtain the S-N curve for the evaluation of the fatigue characteristics of the composite bogie frame, we performed a tension-compression fatigue test for composite specimens with different stacking sequences of the warp direction, fill direction, and 0°/90° direction. We used a stress ratio (R) of -1, a frequency of 5 Hz, and an endurance limit of 10 7 . The fatigue strength of the composite bogie frame was evaluated by a Goodman diagram according to JIS E 4207. The results show that the fatigue life and strength of the lightweight composite bogie satisfy the requirements of JIS E 4207. Given its weight, its performance was better than that of a conventional metal bogie frame based on an SM490A steel material.
Patent•
29 Jun 2011
TL;DR: In this paper, a high-speed subway train was designed to use the utility model to improve the stability of the high-frequency subway train and reduce the stress condition of the train.
Abstract: The utility model relates to a bogie used on a high-speed subway train. The bogie comprises a framework, a central traction device, four groups of primary suspension devices, four axle boxes, two groups of wheel pairs, a braking device and a driving transmission device, wherein the framework comprises two side beams arranged parallelly and a cross beam vertically connected between the two side beams; the cross beam comprises two steel pipes arranged parallelly and two small longitudinal beams arranged between the two steel pipes in a spanning way; and a pair of motor hanging seats, a pair of traction pull rod seats and a pair of gearbox hanging seats are arranged back to back in a centrosymmetric manner on the outer surfaces of the two steel pipes. By adopting the bogie provided by the utility model, the circumstance that cracks are generated during operation is effectively prevented, the stress condition is improved, the operating stability of the high-speed subway train is improved, and the production and assembly manufacturability is optimized.
Journal Article•
TL;DR: In this paper, an aerodynamic model of train was built based on 3D steady compressible N-S equation and turbulent model of k-e two equations, and the aerodynamic properties of high-speed train running at 400 km·h-1 were numerically simulated by using finite volume method.
Abstract: To study the aerodynamic drag properties of high-speed train bogies,an aerodynamics model of train was built.Based on 3D steady compressible N-S equation and turbulent model of k-e two equations,the aerodynamics properties of high-speed train running at 400 km·h-1 were numerically simulated by using finite volume method.The influence of train bottom shapes on bogie's aerodynamic drag was analyzed.Analysis result shows that the flow field structure of bogie region is very complex.Vortices emerge on both the forward and backward bogies.The aerodynamic drags of bogies are different.Under crosswind-free condition,the aerodynamic drag of the first bogie is more than 4 times of the fourth bogie.The aerodynamic drag of bogie takes up more than 20% of whole train aerodynamic drag,and it is more than 40% under crosswind.The maximum differences of bogie aerodynamic drags are more than 30% due to the different shapes of train bottom.The aerodynamic drags of bogies and whole train reduce due to changing train bottom shape appropriately.2 tabs,10 figs,16 refs.
TL;DR: In this paper, the influences of car body stiffness and coupled vibration between the metro vehicle flexible car body and the bogie bounce mode were investigated with a vertical metro vehicle model including the car body.
Patent•
23 Feb 2011
TL;DR: In this paper, a power bogie with independent wheels for 100 percent low-floor light rail vehicles is presented, which consists of a framework, an axle mechanism, primary and secondary springs, secondary vertical dampers, a double-pull rod traction mechanism, the longitudinal driving mechanism of an elastically frame-suspended motor and a hydraulic brake unit, wherein the side beams of the framework are cantilevers which protrude outward.
Abstract: The invention discloses a power bogie with independent wheels for 100 percent low-floor light rail vehicles. The power bogie with the independent wheels comprises a framework, an axle mechanism, primary springs, secondary springs, secondary vertical and transverse dampers, a double-pull rod traction mechanism, the longitudinal driving mechanism of an elastically frame-suspended motor and a hydraulic brake unit, wherein the side beams of the framework are cantilevers which protrude outward; two short shafts are supported by bearing units and connected with elastic wheels respectively; an axle consists of the two short shafts; two wheels on the same side of the bogie are fixed on a motor-driven shaft; a motor is coupled with two gear boxes; a brake system is integrated with a traction motor; the four secondary vertical dampers are arranged at the four corners of the framework; the secondary transverse dampers are arranged at the two ends of the framework; and a parallel double-pull rod traction system is arranged on the inner side of the framework. The requirement of 100 percent low floor on vehicle bodies is really realized by the high-strength welded framework, the independent wheel axle mechanism, the primary springs and the secondary springs which are rationally structured, the optimal secondary vertical and transverse dampers, the parallel double-pull rod traction device with internal traction, the longitudinal drive of the elastically frame-suspended motor, and the hydraulic brake unit which is integrated with the traction motor.
Patent•
30 Nov 2011TL;DR: In this paper, the authors proposed a traction control assembly for connection between a monorail bogie frame and a car, consisting of a first traction link pivotally connected to a first bell crank mechanism and a second traction link pivoting to a second wheel crank mechanism.
Abstract: A traction control assembly for connection between a monorail bogie frame and a monorail car. The traction control assembly comprising a first traction link pivotally connected to a first bell crank mechanism and a second traction link pivotally connected to a second bell crank mechanism. The first traction link and the second traction link are capable of absorbing traction forces applied to the monorail bogie. The traction control assembly further comprises a cross link interconnecting the first bell crank mechanism and the second bell crank mechanism and a passive steering assist device interconnecting the first bell crank mechanism and the second bell crank mechanism. The steering assist device causes the traction control assembly to insert shear forces on the monorail bogie during travel of the monorail bogie over a curved section of monorail track for facilitating rotational motion between the monorail bogie and the monorail car.
Patent•
3 Aug 2011
TL;DR: In this article, an improved variable-gauge bogie with rotating axles is described, which consists of a bearing platform of a railway wagon, at least one rotating axle and a track gauge change device.
Abstract: The invention relates to an improved variable gauge bogie with rotating axles which comprises: a bearing platform of a railway wagon; at least one rotating axle (2) including in its outer areas bearing parts (10) of the suspension springs (11) of said platform on which two wheels (1) are assembled by means of a coupling device which allows their lateral movement and has connected thereto fixing guides (18) by means of which said lateral movement is controlled so as to be located in the positions corresponding to the two track gauges; and a track gauge change device borne on a tubular element (29) connected to the platform and assembled in said rotating axle (2) in a more central position in the longitudinal direction of said axle (2) than that of the corresponding wheel (1), based on the cooperation of said fixing guides (18) and a lock (22) which is vertically movable when actuated by locking/unlocking guides (24) provided in a changing installation.
Patent•
13 Oct 2011
TL;DR: In this paper, the authors proposed a vibration damping device for rolling stock, capable of improving ride comfort of a rolling stock in a curved section as well as driving speeds in the section.
Abstract: PROBLEM TO BE SOLVED: To provide a vibration damping device for rolling stock, capable of improving ride comfort of a rolling stock in a curved section as well as driving speeds in the section.SOLUTION: The vibration damping device 1 for rolling stock is capable of suppressing the vibration of a vehicle body B by installing actuators A, A provided as a pair between a bogie W of the rolling stock and a vehicle body B. While the rolling stock is running in a curved section, the one actuator A is active-controlled and the other actuator A is functioned as an uneven-effective damper exhibiting only a damping force in such a direction as to push the other actuator A toward inward of the curved section.
TL;DR: In this paper, the authors presented a new active steering bogie design, actuated yaw force steering (AY-FS), that is able to steer under high traction loads in tight curves.
Abstract: Active steering control in the form of secondary yaw control (SYC) and actuated wheelset yaw (AWY) have been in prototype development. This paper presents a new active steering bogie design, actuated yaw force steering (AY-FS), that is able to steer under high traction loads in tight curves. The AY-FS bogie design is compared with the AWY design. The steering performance AWY under high traction loads has not been previously reported. This paper examines five control methods, three for AWY and two for AY-FS bogies and assesses the traction curving and stability control performance of the alternative designs and control methods compared with each other and to passive steering bogie designs. The curving performance results showed considerable advantage in the proposed AY-FS bogies over the AWY. It was shown that control must be applied to both the yaw angle and the steering angle of the bogie to achieve the best traction steering performance which was not possible with the AWY bogies. The proposed new bogie designs of AY-FS overall give better traction curving and stability performance than the AWY designs.
Patent•
23 Nov 2011
TL;DR: In this article, a device for measuring secondary suspension parameters of a railway vehicle bogie based on a simulated frame is presented, which can be used for dynamic and static measurement of secondary comprehensive parameters of various railway vehicle bogs.
Abstract: The invention relates to a device for measuring secondary suspension parameters of a railway vehicle bogie based on a simulated frame. The device comprises a plurality of weights (h), the simulated frame (i) for test, a set of moving flame (j) for supporting the simulated frame for test, two secondary three-dimensional force platforms (k), a longitudinal actuator (1) of the simulated frame, two transverse actuators (m) of the simulated frame, two vertical actuators (n) of the simulated frame and four sets of vertical pull-down pin sensors and connecting rods (o), wherein the weights (h) are mounted on the simulated frame (i); the secondary three-dimensional force platforms (k) are respectively connected with the simulated frame (i) and a railway vehicle bogie to be measured (II); a spindle (7) for supporting the simulated frame is supported by the moving flame (j) for supporting the simulated frame; and one ends of the transverse actuators of the simulated frame are respectively hinged with framework locating supports and the other ends thereof are connected with the simulated frame. The device can be used for dynamic and static measurement of secondary comprehensive parameters ofvarious railway vehicle bogies.
Patent•
21 Mar 2011
TL;DR: In this paper, the aerodynamic performance of a rail vehicle is improved by incorporating discrete streamlined elements (4, 21, 22, 23) mounted under the floor of the vehicle.
Abstract: A rail vehicle (1) comprising a floor (10) under which is mounted at least one vehicle support bogie (2) intended to run on a track, the vehicle being characterized in that it comprises discrete streamlined elements (4, 21, 22, 23) mounted under the floor (10) and designed to improve the aerodynamic performance of said bogie (2) during longitudinal travel of the vehicle (1).
TL;DR: In this paper, a mathematical model of a railway carriage running on curved tracks is constructed by deriving the equations of motion concerning the model in which single-point and two-point wheel-rail contact is considered.
Abstract: A mathematical model of a railway carriage running on curved tracks is constructed by deriving the equations of motion concerning the model in which single-point and two-point wheel-rail contact is considered. The presented railway carriage model comprises of front and rear simple conventional bogies with two leading and trailing wheelets attached to each bogie. The railway carriage is modeled by 31 degrees of freedom which govern vertical displacement, lateral displacement, roll angle and yaw angle dynamic response of wheelset whereas vertical displacement, lateral displacement, roll angle, pitch angle and yaw angle dynamic response of carbody and each of the two bogies. Linear stiffness and damping parameters of longitudinal, lateral and vertical primary and secondary suspensions are provided to the railway carriage model. Combination of linear Kalker's theory and nonlinear Heuristic model is adopted to calculate the creep forces in which introduced at wheel and rail contact patch area. Computer aided-simulation is constructed to solve the governing differential equations of the mathematical model using Runge-Kutta fourth order method. Principle of limit cycle and phase plane approach is applied to realize the stability and evaluate the concerning critical hunting velocity at which railway carriage starts to hunt. The numerical simulation model is used to study the influence of vertical secondary suspension spring stiffness on the ride passenger comfort of railway carbody running with speeds under and at critical hunting velocity. High magnitudes of vertical secondary spring stiffness suspension introduce undesirable roll and yaw dynamic response in which affect ride passenger comfort at critical hunting velocity. Low critical hunting velocity with railway carriage running on curved tracks can be represented.
Patent•
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26 Oct 2011
TL;DR: A wheel disc braking meter gauge bogie as discussed by the authors enables high speed braking, reduces noise, prevents heat influence to the wheel tread in the tread brake effectively, and increases life and running safety; the vehicle presents better dynamic performance, security and amenity.
Abstract: A wheel disc braking meter gauge bogie includes an axle box (1) of wheel set, a frame (2), a shaft (17), a swinging jib rubber joint (26), a drive device, a foundation brake device, a primary suspension system, a secondary suspension system, an anti-rolling torsion bar device and a traction device. The drive device comprises a motor (16), a shaft coupling (15), a gearbox (14), and a suspender (18) of the gearbox (14). The foundation brake device is wheel disc braking device and is equipped with a brake plate (24) at the front end of the frame' side beam. The wheel disc braking meter gauge bogie enables high speed braking, reduces noise, prevents heat influence to the wheel tread in the tread brake effectively, and increases life and running safety; the vehicle presents better dynamic performance, security and amenity.
1 Jan 2011
TL;DR: In this paper, a qualitative comparison of the key characteristics and subsequent impact performance for articulated and non-articulated train types is presented, where the authors identify and compare the areas referred to as impact worthiness design.
Abstract: This article presents a qualitative comparison of the key characteristics and subsequent impact performance for articulated and non-articulated train types. The fundamental aim of the article is, by a review of articulated and non-articulated trains in terms of impact stability, to identify and compare the areas referred to as ‘impact worthiness’ design. The major differences between articulated and non-articulated trains are highlighted first. Then, the mechanical reasons leading to the differences and their consequences to impact performance are analyzed from 3 viewpoints: coupling stiffness and freedom, support and coupling patterns, and carbody structural features. The analysis shows that differences in bogie support positions on the carbody and the effects on coupling devices lead to differences in several structural and compositional characteristics, including height of gravity of the carbody, length of the vehicle, composition of the end panel, stiffness of coupling device, number of support points to vehicle, and support height of the secondary suspension. These characteristics result in different impact responses for the 2 types of train and are directly related to subsequent behavior. Articulated trains show stiff connection and integral performance in collisions but with less capability for absorbing impact energy between vehicles, whereas non-articulated trains show flexible connection with more random behavior in collisions but with greater options for energy absorber installation between vehicles.
Patent•
31 Oct 2011
TL;DR: In this paper, a self-steering railway bogie with a leading and a trailing wheelset is described, with a number of fluid cylinders attached between the wheelset ends and the frame, and fluid flow means allowing wheelsets to yaw inversely relative to each other and restricting other relative movement of the wheelsets.
Abstract: The invention relates to railway bogies, and more particularly, but not exclusively to a self - steering bogie for a locomotive. In accordance with the invention there is provided a self - steering railway bogie (1) comprising leading and trailing wheelset (2.4) having two ends (3,5) and a frame for limiting the movement of the wheelset ends. The bogie is provided with a number of fluid cylinders (7) attached between the wheelset ends and the frame, and fluid flow means (8) between the cylinders allowing wheelsets to yaw inversely relative to each other and restricting other relative movement of the wheelsets.
25 May 2011
TL;DR: In this article, the relative motion between wheel-set and rails is investigated through the search of an equilibrium configuration, the positions of contact points between rails and wheels are first located and the detection methods allow also the definition of the normal unit vectors to rail and wheel at contact points.
Abstract: This article describes an investigation on the relative motion between wheel-set and rails. Through the search of an equilibrium configuration, the positions of contact points between rails and wheels are first located. The detection methods allow also the definition of the normal unit vectors to rail and wheel at contact points. To reduce computing time, the results are stored in a lookup table accessed during the dynamic analyses of wheel-sets, bogies, or trains. The use of lookup table considerably speeds up contact detection when numerically integrating with respect to time.
Patent•
20 Jul 2011
TL;DR: In this paper, a locomotive bogie frame for broad-gauge and high-speed operation is presented, which comprises a box frame structure which takes the shape of the Chinese character mu meaning eye and is formed by welding two end beams.
Abstract: The utility model discloses a locomotive bogie frame suitable for broad-gauge and high-speed operation, which comprises a box frame structure which takes the shape of the Chinese character mu meaning eye and is formed by welding two end beams, a draw beam, a cross beam, a right side beam and a right side beam; various accessory mounting seats are welded on the end beams, the draw beam, the cross beam, the left side beam and the right side beam respectively; the draw beam, the cross beam, the left side beam and the right side beam all adopt structures provided with box sections and formed by welding steel plates; the accessory mounting seats are also formed by welding steel plates; and the draw beam, the cross beam and the end beams all adopt U-shaped structures with concave middle parts. The locomotive bogie frame is simple in manufacturing process and lower in cost, effectively solves the problem of potential safety hazard in driving due to casting defects; and the locomotive bogie frame has good load-carrying properties and can meet the design requirements of axle weight 21 t and axle weight 23 t.
Patent•
14 Dec 2011
TL;DR: A transformer station track type intelligent inspection robot can realize the control of accurate walking and locating, and the like on a planned track, and can also realize the continuous fixed point observation of multiple targets as discussed by the authors.
Abstract: The utility model belongs to the field of special robot, and specifically relates to a transformer station track type intelligent inspection robot. The robot includes bogies, a chassis, a current collector, stroke switches, a holder, a control system, a skid wire, and locating pieces. The two bogies are independent from each other, and have the same structure. The two bogies are operated by riding on a track. One side of the track is provided with the skid wire, and the other side is provided with a plurality of locating pieces. The chassis is connected with the two bodies respectively. The holder and the control system are arranged on an upper surface of the chassis. One side of the bogie is provided with the current collector which gives the power supply to the robot and slides on the skid wire, the other side of the two bogies are provided with the stroke switches respectively, and the motion tracks of the stroke switches correspond with the mounted positions of the locating pieces. The current collector and the stroke switches are connected with the control system respectively. The transformer station track type intelligent inspection robot can realize the control of accurate walking and locating, and the like on a planned track, and can also realize the continuous fixed point observation of multiple targets.