vibration analysis of a hybrid levitation pod with compressor unbalanced force in hyperloop system

Hyperloop transportation technology (htt) is a worldwide invention proposed by elon musk in the last decade. this system works based on moving an ultra-high-speed capsule-shaped vehicle called a “pod” into low-air pressure tubes. in this paper, we conceptually designed a largesized industrial pod equipped with an axial compressor. also, we considered an unbalanced centrifugal force on the compressor blades. the novel-designed pod has two suspensions simultaneously, including magnetic levitation (ems kind) and air cushion technology. we applied the air cushions to overcome the overall weight of the pod. also, we used magnets for the motion stability of the pod. the present study proposes a 5-dof dynamic model for the system containing the pod’s vertical and lateral displacements and the body pitching, rolling, and yawing angles. in this regard, the natural frequencies are verified using simulating the system in adams software. afterward, we analytically calculated the natural frequencies and system responses by applying the impedance matrix method. in the numerical results, we analyzed the pod responses, when the resonance phenomenon occurs for undamped and damping cases. results showed oscillations increased by increasing the unbalancing parameter. we finally investigated the effect of two main design parameters containing the pod’s total mass and stiffness of the air cushions on the natural frequencies. increasing the air cushion’s stiffness and decreasing the total mass generally increase the natural frequencies.