Research On Vertical Coupling Characteristics Of Evacuated Tube Vehicles And Evacuate-pillars

Since the vacuum pipeline transportation system is of great significance for the development of high-speed traffic,countries such as Europe and the United States have begun to attach importance to the development of vacuum pipeline transportation systems.China’s research and development of the vacuum pipeline transportation system started late,but it was also put on the agenda of the national strategy.China plans to build the first vacuum pipeline transportation line in 2035,which means that the research on vacuum pipeline transportation system needs more investment.The study of coupled vibration of vehicles,pipelines and support beams in vacuum transportation systems will directly affect the safety,comfort and technical economy of the transportation system.Therefore,research on coupled vibration is imperative.In order to study the vertical coupling dynamics and lateral dynamics between Evacuated Tube Transportation and tube-pillars,this paper first studies the Evacuated suspension vehicle model of Evacuated Tube Transportation,and analyzes that the pneumatic suspension system needs to increase the secondary suspension.Based on this,a 10 degree-of-freedom two-series pneumatic suspension vertical vehicle model is established,and the motion balance equation of the vehicle-to-pipe-pillar coupled vibration model of the complete vehicle is derived.All the degrees of freedom of the vehicle model and the pipe-pillar model are coupled through the air gap,eliminating the independent degrees of freedom,establishing a unified system of motion equations,and solving synchronously.In the solution,the Newmark method with high precision and fast calculation speed is used in the numerical analysis method of calculating the coupled vibration of the axle.Combined with its calculation characteristics,the Matlab calculation program is compiled.The coupled vibration equation is separated and iterated to solve the vehicle and the pipeline.-Dynamic parameters such as vertical acceleration and vertical acceleration of the strut.As a Evacuated Tube vehicle as a new type of high-speed vehicle,there is no commercial operation line yet.However,maglev trains and Evacuated Tube Transportation belong to the same contactless vehicle,and there are many similarities and comparability between them.Therefore,in addition to a single study of the vertical coupling characteristics of Evacuated Tube Transportation,this paper also compares the dynamic effects of the two.In the study of vertical coupling dynamics of Evacuated Tube Transportation and tube-pillars,the dynamic response of maglev vehicles on two span beams is compared and analyzed.In order to meet the needs of numerical simulation,the model has corresponding assumptions and simplifications according to the key issues of the research.This paper considers the pipeline and the pillar as a whole,based on the air suspension suspension with the second suspension and the vehicle and tube-pillars The vibration model studies the vertical vibration characteristics of the Evacuated Tube vehicle and compares its characteristics with the magnetic suspension vehicle.The analysis shows that the vertical dynamic response of the body and the pipe-pillar of the Evacuated Tube train meets the requirements,and the result is less than the comfort of the German ICE high-speed vehicle and the vertical parameter of the tube-pillars,and the super-high speed when the vehicle speed is greater than 500km/h.When operating conditions,the Evacuated Tube has a smaller vertical response and a more stable system than the maglev train.In the separate study of tube and pillars,a standard simply supported beam model was first established by using the finite element software ANSYS.The self-vibration characteristics of the pipeline and the pillar were compared and analyzed.The results show that the natural vibration frequency is concentrated between 4~18Hz.The line irregularity control of the line with an irregularity of0.55~20m corresponding to the speed of 500km/h can basically meet the requirements of vehicle stability.Finally,the hyplerloop and its running line are taken as the object to study the lateral dynamic characteristics of the Evacuated Tube vehicle on the curve.The Evacuated Tube vehicle research in this paper will provide ideas and methods for the subsequent research of Evacuated Tube transportation.The results of the study will provide a reference for optimizing the kinetic parameters of vehicles and tube,reducing line costs,and improving the safety and comfort of Evacuated Tube vehicles.