| 1. |
- Berghuvud, Ansel, et al.
(författare)
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Dynamic behaviour of ore wagons in curves at Malmbanan
- 1998
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Ingår i: Vehicle System Dynamics. - : Informa UK Limited. - 0042-3114 .- 1744-5159. ; 30:3-4, s. 271-284
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Tidskriftsartikel (refereegranskat)abstract
- The transportation of ore can be made more cost efficient by use of bigger and heavier trains. An increase in axle load is thereby wanted. The fleet of ore wagons of today at Malmbanan/Ofotbanan in northern Sweden and Norway has to be updated. It is of interest to find out if it is possible to allow a higher axle load on the track with new wagons. To be able to understand and predict the effects on track wear depending on what type of vehicle that is in use, the contact forces between wheels and rails have to be determined. A computer aided analysis has been made of the dynamic behaviour of three test vehicles equipped with different types of three-piece bogies running at Malmbanan. The vehicles are modelled and their interaction with the track is analyzed using the multibody simulation package GENSYS. The simulations show that, even if the axle load is increased from 25 tons to 30 tons and the velocity is increased from 50 km/h to 60 km/h, it is possible to reduce lateral track forces and wear in curves by using a different bogie than the standard three-piece bogie used today
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| 2. |
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| 3. |
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| 4. |
- Berghuvud, Ansel, et al.
(författare)
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Prediction of lateral wheel-rail contact forces for ore wagons with three-piece bogies
- 1998
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Ingår i: Proceedings of the 6th Mini Conference on Vehicle System Dynamics, Identification and Anomalies. - Budapest : Techn. Univ.. - 9634206352 ; , s. 161-170
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Konferensbidrag (refereegranskat)abstract
- The transportation of ore can be made more cost efficient by use of bigger and heavier trains. An increased load on the track gives higher demands on both vehicle and infrastructure performance in order to limit the maintenance cost. At Malmbanan/Ofotbanen in Sweden and Norway there are many tight curves along the track experiencing high wear. One criterion for allowing a higher axle load is therefore to reduce the lateral track forces compared to the level of today. To evaluate the effect of an increased axle load, instrumented wheelset measurements were performed on different test vehicles of three-piece type. The measurements show essential variations in lateral force levels depending not only on curve radius and coefficient of friction in the wheel-rail contact, but greatly on the actual individual curve. This effect is studied in this work. The curving performance of one of the vehicles when running through curves with different rail profiles have been simulated. Both simulations and experimental results show large lateral forces for the typical situation on the studied track. The importance of matching wheel and rail profiles in order to get low contact forces and, as a consequence, less wear is shown.
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| 5. |
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| 6. |
- Drugge, Lars, et al.
(författare)
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Modelling and simulation of catenary-pantograph interaction
- 1999
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Ingår i: Vehicle System Dynamics. - : Informa UK Limited. - 0042-3114 .- 1744-5159. ; 33:suppl 1, s. 490-501
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Tidskriftsartikel (refereegranskat)abstract
- Modelling and simulation of the dynamic behaviour of catenary-pantograph interaction is an important part when assessing the capability of a current collection system for railway traffic. The large variation in infrastructure characteristics in different countries and railway companies, different types of traffic, designs of pantographs etc. makes it almost impossible to develop a final simulation model of such a system. Instead, it would be favourable to have a tool that has the ability to set up models of such systems, choose relevant detail of the models, run simulations and finally visualize the results. To make the tool useful for engineers, design experts as well as simulation experts, the functionality of the tool must be worked out. Aspects on computer simulation such as developed models, simulation methods and computer tools are presented. The aim is to develop a scenario that considers different designs, models, solution methods and user levels. The scenario focuses on how to structure the use of simulation of dynamics in catenary-pantograph development. A scenario is sketched built on different user levels, a modular structure and a structure for information management
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| 7. |
- Drugge, Lars, et al.
(författare)
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The nonlinear behaviour of a pantograph current collector suspension
- 1999
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Ingår i: Proceedings of the 1999 ASME Design Engineering Technical Conferences.
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Konferensbidrag (refereegranskat)abstract
- The pantograph-catenary system is a critical component for trains required to run at higher speeds. The pantograph often includes nonlinear characteristics and the scope of this work is to investigate if nonlinear dynamic phenomena can occur in an existing design. A model of a pantograph suspension subsystem has been developed according to physical parameter values of the head suspension of the Schunk WBL88/X2 pantograph, providing electric power to the Swedish high-speed train X2. Studies of the system response for different force excitation show both harmonic, subharmonic and chaotic behaviour for the investigated parameter regions.
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| 8. |
- Hardell, Christian, et al.
(författare)
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A relational database for general mechanical systems
- 1995
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Ingår i: Computational Dynamics in Multibody Systems. - Dordrecht : Encyclopedia of Global Archaeology/Springer Verlag. - 792333047 ; , s. 49-59
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Konferensbidrag (refereegranskat)abstract
- This paper provides a specification of a relational data base structure for mechanical systems. Through the example provided, a robot gripping device, it is demonstrated how the initial development of the data-base structure has successfully led to an implementation in a practical software environment. The data base is accessible to multiple engineering application programs and supports a flexible environment for the continuing development of new applications
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| 9. |
- Jerrelind, Jenny, et al.
(författare)
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Braille printer Dynamics
- 1999
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Ingår i: Proceedings of the ASME Design Engineering Technical Conferences.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 10. |
- Karlsson, Lennart, et al.
(författare)
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Designing and controlling complex mechanisms
- 1996
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Ingår i: Complex technical systems. - Stockholm : Forskningsrådsnämnden. ; , s. 149-161
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 11. |
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| 12. |
- Stensson, Annika, et al.
(författare)
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Industry demands on vehicle development - methods and tools
- 1999
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Ingår i: Vehicle System Dynamics. - : Informa UK Limited. - 0042-3114 .- 1744-5159. ; 33:Suppl 1, s. 202-213
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Tidskriftsartikel (refereegranskat)abstract
- A very important goal of mechatronics in system development is the integration of mechanical, electronic and software subsystems in order to increase functionality, minimize weight, and reduce production costs. In this work, industry demands on methods and tools for mechatronic vehicle development are addressed from the current product development in industry. The development of a mechatronic car door concept and dynamic stability control are used as examples to identify strong and weak parts of the current processes. Railway vehicle development aspects are also discussed. It is shown that a very important aspect for a successful mechatronic design is co-operation in an interdisciplinary design team. In terms of design methodology, the systematic identification of mechatronic potential based on function analysis is a main issue. Computer tools and technology for concept simulation, co-simulation, managing of models with different complexity as well as model exchange are identified as important demands for future effective development of mechatronic vehicles.
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| 13. |
- Yagi, T., et al.
(författare)
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Simulation and Visualisation of the Dynamic Behaviour of an Overhead Power System with Contact Breaking
- 1996
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Ingår i: Vehicle System Dynamics. - : Informa UK Limited. - 0042-3114 .- 1744-5159. ; 25:1, s. 31-49
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Tidskriftsartikel (refereegranskat)abstract
- For high speed rail traffic it is necessary to design overhead power systems which minimize the contact loss between pantograph head and contact wire. To predict how different design solutions will behave it is favourable to model and simulate the dynamic behaviour. In this paper a model of an overhead power system is specified and used in simulation. The model is suitable for simulation with contact loss since it includes specifications of impact conditions between pantograph head and contact wire. Two sets of equations of motion are specified, one for the contact case and one for the non-contact case. The model also includes lateral movement of the wire due to the zigzag span and friction between the pantograph head and the contact wire. It is shown how to make animations of the system behaviour using a MCAE-system. The animations are made using a geometrical model of the system together with results from numerical simulations. Through the examples provided, use of the mathematical model and the geometrical model is presented. The response is visualised as time histories and phase plane diagrams of different coordinates and as animations of the total system response. The different types of visualisations make an excellent combination when studying the system behaviour of different design solutions. In one example, simulation using the linearised set of equations gives the same results as simulation using the set of fully nonlinear equations, due to periodic response and the simple alternation of contact conditions. It is shown that the situation when any of the parameters vary suddenly is possible to simulate using the fully nonlinear equations of motion.
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