Stability analysis of a hybrid levitation pod in a hyperloop transportation system considering aerodynamic forces
Hyperloop transportation technology(HTT)is a new mode of transport.It works based on moving an ultra-high-speed vehicle called a pod into the low-air pressure tubes.This paper investigated the stability analysis of a novel hybrid levitation pod considering aerodynamic forces that has not been studied yet.The proposed pod contains two levitation,electromagnetic suspension(EMS),and air cushion.In this regard,air cushions help the system overcome the overall weight.On the other hand,EMS magnets are responsible for the motion stability of the pod in the presence of aerodynamic forces using two Proportional-Derivative(PD)controllers:one for controlling the vertical displacement and another one for the lateral motion.In this paper,a 5-degrees-of-freedom(DOF)dynamic model for the proposed pod is developed that includes the vertical and lateral displacements of the pod as well as the body's pitching,rolling,and yawing moments.In addition,the dynamic models for air cushions,magnetic suspensions,and aerodynamic forces are presented.After solving the related dynamic equations,the effect of controller parameters and aerodynamic lift and drag forces on the stability of the proposed pod is studied.Fur-thermore,the influence of controller coefficients and some other pod design parameters including the air cushions'stiffness,the total mass of the pod,and the air pressure inside the tube at critical speed is analyzed.
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