High speed trains are an indispensable part of rapid transportation systems in many countries. As the fastest means of transport on the ground, these trains are extremely sensitive to the terrain and track conditions. Geometrical irregularities and mechanical characteristics of the track, together with inconsistencies in the lane (including bridges that support the track) are considered importa...

This paper introduces a novel system identification and tracking method for PieceWise Smooth (PWS) nonlinear stochastic hybrid systems. We are able to correctly identify and track challenging problems with diverse dynamics and low dimensional transitions. We exploit the composite structure system to learn a simpler model on each component/mode. We use Gaussian Process Regression techniques to l...

Single-track hard disk drive (HDD) seek performance is measured by settle time, ts, defined as the time from the arrival of a seek command until the measured position reaches and stays within an acceptable distance from the target track. Models of HDD dynamics are typically nonminimum phase (NMP), which complicates control design focused on settle time performance improvements. Our previous wor...

In this article, we investigate the use of wavelets for frequency tracking in the presence of high dynamics. In particular, we construct automatic frequency control loops that are based on correlating the incoming sinusoidal signal with Fourierbased functions and with Daubechies-4 wavelet functions. Both loops are compared based on their abilities to track an input frequency with varying degree...

Fastening failures have frequently been found on China high-speed railway curved tracks in recent years. Thus the influence of fastening train-track interaction track needs to be analyzed. A train-curved slab model is built, which real shape rail considered and modeled with reduced beam (RBM) theory, slabs are four-nodes Kirchhoff-Love plate elements. The present validated at first different tr...

Automatic track guiding of vehicles is of increasing interest for Intelligent Vehicle/ Highway Systems 1{3]. Track guided vehicles are used in automated production facilities, ship docks, and for city busses which drive in special narrow lanes. The primary task of such a system is to follow a path as well as possible. Track guiding systems have been designed for various controller structures 4{...

The effect of sequence heterogeneity on the dynamics of molecular motors is reviewed and analysed using a set of recently introduced lattice models. First, we review results for the influence of heterogeneous tracks such as a single strand of DNA or RNA on the dynamics of the motors. We stress how the predicted behaviour might be observed experimentally in anomalous drift and diffusion of motor...

A fast ion can electronically excite a solid producing a track of damage, a process initially used to detect energetic particles but now used to alter materials. From the seminal paper by Fleischer et al. [Phys. Rev. 156, 353 (1967)] to the present, "Coulomb explosion" and thermal spike models have been often treated as competing models for describing ion track effects. Here molecular dynamics ...