Curve squeal in railway vehicles is an instability mechanism that arises in tight curves under certain running and environmental conditions. In developing a model the most important elements are the characterisation of friction coupled with an accurate representation of the structural dynamics of the wheel. However, the role played by the dynamics of the rail is not fully understood and it is u...

We solve numerically the equations of motion for the collapse of a shell of baryonic matter, made of galaxies and substructure of 10 6 M ⊙ ÷10 9 M ⊙ , taking into account the dynamical friction and the parameters on which it depends: the peaks' height ν c , the number of peaks inside a protocluster N tot multiplied by the correlation function ξ(r) evaluated at r = 0, the filtering radius R f an...

In this paper, a SDOF system with nonlinear viscous friction under harmonic excitation is studied. A nonlinear viscous friction model is built as an exponential expansion of the relative slip velocity. According to the adaptive control theory, an adaptive controller for the friction compensation of the SDOF system with nonlinear viscous friction is put forward by using the model-based parameter...

It has been known for some time that rotating bars in galaxies slow due to dynamical friction against the halo. However, recent attempts to use this process to place constraints on the dark matter density in galaxies and possibly also to drive dark matter out of the center have been challenged. This paper uses simplified numerical experiments to clarify several aspects of the friction mechanism...

The tire-road friction coefficient is critical information for conventional vehicle safety control systems. Most previous studies in tire-road friction estimation have only considered either longitudinal or lateral vehicle dynamics which tends to cause significant underestimation of the actual tire-road friction coefficient. In this paper, the parameters, including the tireroad friction coeffic...

in this paper, a novel technique on friction aided deep drawing using tapered blank holder divided into eight segments is proposed to overcome defect of friction aided deep drawing using four segments tapered blank holder technique. a taper blank holder is designed to be of two parts: stationary part with 5 degree taper angle and moving parts divided into eight tapered segments. the main functi...

The paper presents some recent advances in experimental methods to investigate the phenomenon of high speed friction. In particular, Ž . Ž . two novel experimental methods are employed in the present study: a the plate impact pressure–shear friction experiment, and b the torsional Kolsky bar friction experiment. Using these experimental configurations, dynamic frictional characteristics of Carp...