Measurements and analysis of track irregularities on high speed maglev lines

Abstract

Abstract:Track irregularities have an obvious effect on the running stability and ride quality of maglev trains traveling at high speeds. We developed a measurement principle and data processing method which were applied to the high speed maglev line operating. The method, which includes partial filtering, integration, resampling of signal, and a low pass Butterworth filter, was used to calculate the irregularities of the maglev line. The spectra of the sample space were evaluated. A 7-parameter power spectrum density (PSD) function of line irregularities was fitted, based on the measured data. Analysis of the results showed that the maglev stator plane irregularities were better than conventional railway vertical rail irregularities when the wavelength was 5-100 m, and worse when the wavelength was 1-5 m. The PSD of maglev guidance plane irregularities was similar to that of cross level GRSHL (German railway spectra of high irregularity) when the wavelength was 10-100 m. The irregularities were clearly worse than cross level rail irregularities in a conventional railway when the wavelength was 1-10 m. This suggests that short-wavelength track irregularities of a maglev line caused by deviation and inclination of the stator plane should be minimized by strictly controlling the machining error of functional components during construction and maintenance.

Track Irregularity Disturbance Rejection for Maglev Train Based on Online Optimization of PnP Control Architecture

“…Track irregularities are usually caused by irregularities of concrete beams and stator packs, e.g., subsidence of foundations, temperature/elastic deformation of concrete beams, errors of cushion thickness, machining errors of stator pack, etc. [22]. From the irregularities forms point of view, they may be in the form of vertical deviation, inclination, and deformation of tracks.…”

Research on the Active Guidance Control System in High Speed Maglev Train

“…The input is specified to be y, and the output is specified to be u = u dcl . The state equation of the generalized guidance system is written as, (9), shown at the bottom of the next page.…”

“…The parameters of robust control system are indicated in the Table. 2, and submitted into the generalized state space equation of the guidance system (9). The robust control toolbox of MATLAB for H ∞ control theory is adopted, and the robust controller is designed.…”

“…However, the guidance system maybe suffers from different guide ways and weather conditions, the working characteristics of the guidance system will be changed [8], [9]. Therefore, the model of the guidance system has greater uncertainty, and the guidance controller is more difficult to design This study is conducted to make the high-speed maglev train obtain a stable guidance ability on different conditions.…”

A New Strategy for Improving the Tracking Performance of Magnetic Levitation System in Maglev Train

“…However, due to topographic fluctuations or other spatial constraints, the profile of a maglev train line will change [6][7][8]. The profile of a line is composed of several gradient lines.…”