Modeling and simulation

About: Modeling and simulation is a research topic. Over the lifetime, 10273 publications have been published within this topic receiving 111550 citations.

Multi-train modeling and simulation integrated with traction power supply solver using simplified Newton–Raphson method

Abstract: Multi-train modeling and simulation plays a vital role in railway electrification during operation and planning phase. Study of peak power demand and energy consumed by each traction substation needs to be determined to verify that electrical energy flowing in its railway power feeding system is appropriate or not. Gauss–Seidel, conventional Newton–Raphson, and current injection methods are well-known and widely accepted as a tool for electrical power network solver in DC railway power supply study. In this paper, a simplified Newton–Raphson method has been proposed. The proposed method employs a set of current-balance equations at each electrical node instead of the conventional power-balance equation used in the conventional Newton–Raphson method. This concept can remarkably reduce execution time and computing complexity for multi-train simulation. To evaluate its use, Sukhumvit line of Bangkok transit system (BTS) of Thailand with 21.6-km line length and 22 passenger stopping stations is set as a test system. The multi-train simulation integrated with the proposed power network solver is developed to simulate 1-h operation service of selected 5-min headway. From the obtained results, the proposed method is more efficient with approximately 18 % faster than the conventional Newton–Raphson method and just over 6 % faster than the current injection method.

Substrate coupling: modeling, simulation and design perspectives

Abstract: The finite impedance of silicon substrates has several consequences for the design and performance of ICs. In this paper, we discuss the state of the art in the areas of modeling and simulation of these effects. An overview of various modeling techniques is presented, with emphasis on integral-equation based boundary-element techniques. Numerical stability issues related to these techniques are discussed from a physical viewpoint. The impact on circuit design is considered by the means of specific examples.