Mechanical Analysis Of Overall Urban Magn Etic Track Beam Under Temperature Variation

Urban maglev transit system is an up-to-date non-contact rail transit.Theoretically,maglevs can be divided into two categories,i.e.,electromagnetic suspension(EMS)and electrodynamics suspension(EDS).Its main working mode is to support vehicles via attractive force and repelling force of magnet and drive them forward with linear motor.Maglev transportation system has obvious advantages of low noise level,low energy consumption,non-derailment,small radius of turning circle and high climbing ability,etc.,which make it a new type of competitive ground vehicles.However,there are extremely high requirements on deflection of maglev track beam.Coupled with current situation that different countries have different principles on the selection of mode of temperature gradient and content of related documents varies even within one country.These added huge complexity and difficulties to the research of maglev system.Even though researches on rail bridge and road bridge have reached a mature stage,further exploration and development in temperature field and deformation of maglev track beam are still urgently needed,due to their differences in structures and functions.Such exploration is definitely of vital significance to the development and evolution of the society.This project is conducted based on the current situation of Shanghai maglev system.Two main steps of investigation are carried out,which provide theoretical basis and application reference for structure design and optimization of maglev guideway.1.On the basis of the Shanghai maglev guideway model,a couple of maglev guideway models with different cross-section as well as different span are established.Applied with basic parameters,stress and deformation of track structure of these maglev models under static load effect are calculated.Then,validate whether these models meet safety requirements when compared with current regulations and design standards.2.Maglev guideway model of Shanghai maglev system is established and transient state analysis is conducted using finite element analysis software ANSYS.Applied with extreme temperature variation from-40° to 40°,temperature field variation graph and displacement variation in middle beam are obtained.Compared this experimental result with current standards,it reveals that the guideway can satisfy the current requirements.