The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and... more The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and a state-dependent method to model nonlinear contact forces in the wheel-rail interaction. Contact stiffness and contact filters are pre-calculated as functions of the vertical wheel-rail relative displacement (state-dependency) using three-dimensional surface data in quasi-static contact computations. By including the state-dependent functions in time-domain prediction of wheel-rail interaction, a computationally efficient method to include nonlinear effects is obtained. Results from predictions of contact forces as well as rail vibrations are presented for two conditions; first, both wheel and rail have surface roughness of broadband character and secondly, a rail corrugation is simulated by superimposing a sinusoidal component on the broadband rail roughness. For a train speed of 200 kph, the contact forces and the dynamic response of the rail exhibit nonlinear contact conditions for both the broadband roughness case as well as for the case where a rail corrugation is simulated.
An experimental study of the friction coefficient is performed for a tyre tread block in rolling ... more An experimental study of the friction coefficient is performed for a tyre tread block in rolling and sliding contact with two different asphalt substrates, a smooth aluminium and an anti-slip tape ...
The longitudinal and vertical contact force history of an individual truck tyre tread block in ro... more The longitudinal and vertical contact force history of an individual truck tyre tread block in rolling contact with an asphalt surface is experimentally investigated. Different rolling velocities u ...
A model for calculation of generation and radiation of railway noise is presented. Thanks to a Gr... more A model for calculation of generation and radiation of railway noise is presented. Thanks to a Green's function formulation, in the time as well as in the frequency domain, not only roughness excit ...
ABSTRACT The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact ... more ABSTRACT The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and a state-dependent method to model nonlinear contact forces in the wheel-rail interaction. Contact stiffness and con-tact filters are pre-calculated as functions of the vertical wheel-rail relative displacement (state-dependency) using three-dimensional surface data in quasi-static contact computations. By including the state-dependent functions in time-domain prediction of wheel-rail interaction, a computationally efficient method to include nonlinear effects is obtained. Results from predictions of contact forces as well as rail vibrations are pre-sented for two conditions; first, both wheel and rail have surface roughness of broadband character and secondly, a rail corrugation is simulated by superimposing a sinusoidal component on the broadband rail roughness. For a train speed of 200 kph, the contact forces and the dynamic response of the rail exhibit nonlinear contact conditions for both the broadband roughness case as well as for the case where a rail corrugation is simulated.
For a rolling tyre, forces arise within the tyre-road contact patch, leading to the excitation of... more For a rolling tyre, forces arise within the tyre-road contact patch, leading to the excitation of tyre vibrations and in turn to noise radiation. This is the main cause of highway noise and consequ ...
Rolling contacts present in passenger cars such as in bearings and transmission elements are sour... more Rolling contacts present in passenger cars such as in bearings and transmission elements are sources of noise and vibration, principally for interior comfort concerns. Moreover, tyre/road noise is the main source of road traffic noise which in turn leads to sleep disturbance and annoyance. In order to simulate friction losses as well as generated noise and vibrations in any rolling contact, it is crucial to have a correct description of the dynamic excitation caused by the roughness of the surfaces in contact. In this paper, a state-dependent modelling approach previously proposed by the authors is applied to a well-defined steel-steel rolling contact. A parametric study investigating the influence of rolling speed on contact conditions is performed, indicating the limits for the use of linear point force expressions for the rolling contact investigated. The state-dependent method is based on pre-calculation of contact stiffness and contact filtering as functions of vertical relativ...
The longitudinal and vertical contact force history of an individual truck tyre tread block in ro... more The longitudinal and vertical contact force history of an individual truck tyre tread block in rolling contact with an asphalt surface is experimentally investigated. Different rolling velocities u ...
A model for calculation of generation and radiation of railway noise is presented. Thanks to a Gr... more A model for calculation of generation and radiation of railway noise is presented. Thanks to a Green's function formulation, in the time as well as in the frequency domain, not only roughness excit ...
The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and... more The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and a state-dependent method to model nonlinear contact forces in the wheel-rail interaction. Contact s ...
A well-defined rolling contact problem is studied with the intention to cover interesting aspects... more A well-defined rolling contact problem is studied with the intention to cover interesting aspects of tyre-road contact modeling and rolling contact in general. More specifically, the dynamic response in a steel beam caused by a steel ball rolling over it is studied by theoretical modeling of the beam- And ball dynamics as well as the contact forces. Validation of the dynamic response simulations is achieved by comparison with measurements. The contact model is shown to be greatly dependent on an accurate estimate of the real contact stiffness. A method to estimate the contact stiffness which leads to good accuracy in dynamic response simulations is presented. Although the contact stiffness is significantly lower for rubber- Asphalt interaction than for steel-steel contact, the results give useful insight for tyre-road contact modeling.
An experimental study of the friction coefficient is performed for a tyre tread block in rolling ... more An experimental study of the friction coefficient is performed for a tyre tread block in rolling and sliding contact with two different asphalt substrates, a smooth aluminium and an anti-slip tape ...
Road vehicle tyres, railway wheels and ball bearings all generate rolling contact forces which ar... more Road vehicle tyres, railway wheels and ball bearings all generate rolling contact forces which are transferred within a finite area of contact between the rolling element and the substrate. Either ...
The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and... more The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and a state-dependent method to model nonlinear contact forces in the wheel-rail interaction. Contact stiffness and contact filters are pre-calculated as functions of the vertical wheel-rail relative displacement (state-dependency) using three-dimensional surface data in quasi-static contact computations. By including the state-dependent functions in time-domain prediction of wheel-rail interaction, a computationally efficient method to include nonlinear effects is obtained. Results from predictions of contact forces as well as rail vibrations are presented for two conditions; first, both wheel and rail have surface roughness of broadband character and secondly, a rail corrugation is simulated by superimposing a sinusoidal component on the broadband rail roughness. For a train speed of 200 kph, the contact forces and the dynamic response of the rail exhibit nonlinear contact conditions for both the broadband roughness case as well as for the case where a rail corrugation is simulated.
An experimental study of the friction coefficient is performed for a tyre tread block in rolling ... more An experimental study of the friction coefficient is performed for a tyre tread block in rolling and sliding contact with two different asphalt substrates, a smooth aluminium and an anti-slip tape ...
The longitudinal and vertical contact force history of an individual truck tyre tread block in ro... more The longitudinal and vertical contact force history of an individual truck tyre tread block in rolling contact with an asphalt surface is experimentally investigated. Different rolling velocities u ...
A model for calculation of generation and radiation of railway noise is presented. Thanks to a Gr... more A model for calculation of generation and radiation of railway noise is presented. Thanks to a Green's function formulation, in the time as well as in the frequency domain, not only roughness excit ...
ABSTRACT The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact ... more ABSTRACT The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and a state-dependent method to model nonlinear contact forces in the wheel-rail interaction. Contact stiffness and con-tact filters are pre-calculated as functions of the vertical wheel-rail relative displacement (state-dependency) using three-dimensional surface data in quasi-static contact computations. By including the state-dependent functions in time-domain prediction of wheel-rail interaction, a computationally efficient method to include nonlinear effects is obtained. Results from predictions of contact forces as well as rail vibrations are pre-sented for two conditions; first, both wheel and rail have surface roughness of broadband character and secondly, a rail corrugation is simulated by superimposing a sinusoidal component on the broadband rail roughness. For a train speed of 200 kph, the contact forces and the dynamic response of the rail exhibit nonlinear contact conditions for both the broadband roughness case as well as for the case where a rail corrugation is simulated.
For a rolling tyre, forces arise within the tyre-road contact patch, leading to the excitation of... more For a rolling tyre, forces arise within the tyre-road contact patch, leading to the excitation of tyre vibrations and in turn to noise radiation. This is the main cause of highway noise and consequ ...
Rolling contacts present in passenger cars such as in bearings and transmission elements are sour... more Rolling contacts present in passenger cars such as in bearings and transmission elements are sources of noise and vibration, principally for interior comfort concerns. Moreover, tyre/road noise is the main source of road traffic noise which in turn leads to sleep disturbance and annoyance. In order to simulate friction losses as well as generated noise and vibrations in any rolling contact, it is crucial to have a correct description of the dynamic excitation caused by the roughness of the surfaces in contact. In this paper, a state-dependent modelling approach previously proposed by the authors is applied to a well-defined steel-steel rolling contact. A parametric study investigating the influence of rolling speed on contact conditions is performed, indicating the limits for the use of linear point force expressions for the rolling contact investigated. The state-dependent method is based on pre-calculation of contact stiffness and contact filtering as functions of vertical relativ...
The longitudinal and vertical contact force history of an individual truck tyre tread block in ro... more The longitudinal and vertical contact force history of an individual truck tyre tread block in rolling contact with an asphalt surface is experimentally investigated. Different rolling velocities u ...
A model for calculation of generation and radiation of railway noise is presented. Thanks to a Gr... more A model for calculation of generation and radiation of railway noise is presented. Thanks to a Green's function formulation, in the time as well as in the frequency domain, not only roughness excit ...
The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and... more The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and a state-dependent method to model nonlinear contact forces in the wheel-rail interaction. Contact s ...
A well-defined rolling contact problem is studied with the intention to cover interesting aspects... more A well-defined rolling contact problem is studied with the intention to cover interesting aspects of tyre-road contact modeling and rolling contact in general. More specifically, the dynamic response in a steel beam caused by a steel ball rolling over it is studied by theoretical modeling of the beam- And ball dynamics as well as the contact forces. Validation of the dynamic response simulations is achieved by comparison with measurements. The contact model is shown to be greatly dependent on an accurate estimate of the real contact stiffness. A method to estimate the contact stiffness which leads to good accuracy in dynamic response simulations is presented. Although the contact stiffness is significantly lower for rubber- Asphalt interaction than for steel-steel contact, the results give useful insight for tyre-road contact modeling.
An experimental study of the friction coefficient is performed for a tyre tread block in rolling ... more An experimental study of the friction coefficient is performed for a tyre tread block in rolling and sliding contact with two different asphalt substrates, a smooth aluminium and an anti-slip tape ...
Road vehicle tyres, railway wheels and ball bearings all generate rolling contact forces which ar... more Road vehicle tyres, railway wheels and ball bearings all generate rolling contact forces which are transferred within a finite area of contact between the rolling element and the substrate. Either ...
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