The nonlinear dynamical analysis of damaged concrete slab of high speed railway track using the revised Fourier pseudo-spectral method

2020 ◽  
Vol 244 ◽  
pp. 118336
Author(s):  
Xinwen Yang ◽  
Yao Shu ◽  
Dingwei Qian ◽  
Shunhua Zhou ◽  
Honggui Di ◽  
...  
Keyword(s):  
Spectral Method ◽  
High Speed ◽  
Concrete Slab ◽  
Railway Track ◽  
Dynamical Analysis ◽  
High Speed Railway ◽  
Nonlinear Dynamical ◽  
Nonlinear Dynamical Analysis ◽  
Pseudo Spectral Method ◽  
Pseudo Spectral

Modern Nonlinear Dynamical Analysis of Vertical Plane Motion of Planing Hulls

1993 ◽  
Vol 37 (03) ◽  
pp. 189-199 ◽  
Author(s):  
Armin W. Troesch ◽  
Jeffrey M. Falzarano
Keyword(s):  
High Speed ◽  
Vertical Plane ◽  
Nonlinear Effects ◽  
Plane Motion ◽  
Dynamical Analysis ◽  
Regular Waves ◽  
Nonlinear Dynamical ◽  
Dynamical Systems Analysis ◽  
Extreme Behavior ◽  
Nonlinear Dynamical Analysis

When operating in a seaway, high-speed planing hulls exhibit strong nonlinearities. This paper investigates the vertical plane dynamic stability and response associated with such craft. Explicit expressions for the hydrodynamic forces are developed and modern methods of dynamical systems analysis are applied. An illustrative example is given in which the forced and unforced motions are examined. Parameter studies relating to the following topics are made: the onset of porpoising, the magnitude of motions while porpoising, and forced motions due to regular waves. It is found that while nonlinear effects can reduce the response over that predicted by linear theory, these same effects can also be responsible for sudden extreme behavior. The method described here is another tool that designers and operators can use to provide a more comfortable and safer vessel performance.

scholarly journals The Design and Implementation of an Inertial GNSS Odometer Integrated Navigation System Based on a Federated Kalman Filter for High-Speed Railway Track Inspection

2021 ◽  
Vol 11 (11) ◽  
pp. 5244
Author(s):  
Xinchun Zhang ◽  
Ximin Cui ◽  
Bo Huang
Keyword(s):  
Kalman Filter ◽  
Navigation System ◽  
High Speed ◽  
Measurement Accuracy ◽  
Railway Track ◽  
Filter Method ◽  
Integrated Navigation ◽  
High Speed Railway ◽  
Track Geometry ◽  
Integrated Navigation System

The detection of track geometry parameters is essential for the safety of high-speed railway operation. To improve the accuracy and efficiency of the state detector of track geometry parameters, in this study we propose an inertial GNSS odometer integrated navigation system based on the federated Kalman, and a corresponding inertial track measurement system was also developed. This paper systematically introduces the construction process for the Kalman filter and data smoothing algorithm based on forward filtering and reverse smoothing. The engineering results show that the measurement accuracy of the track geometry parameters was better than 0.2 mm, and the detection speed was about 3 km/h. Thus, compared with the traditional Kalman filter method, the proposed design improved the measurement accuracy and met the requirements for the detection of geometric parameters of high-speed railway tracks.

Risk Assessment Method for High-Speed Railway Track Based on Dynamically Weighted Acceleration

2021 ◽  
Vol 27 (4) ◽  
pp. 04021030
Author(s):  
Xiaohui Wang ◽  
Jianwei Yang ◽  
Jinhai Wang ◽  
Yanxue Wang ◽  
Fu Liu
Keyword(s):  
Risk Assessment ◽  
High Speed ◽  
Assessment Method ◽  
Railway Track ◽  
High Speed Railway ◽  
Risk Assessment Method
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