Simultaneous vibration suppression and energy harvesting system design via electromagnetic shunt damper for high temperature superconducting pinning maglev

Abstract

During the operation of high-temperature superconducting (HTS) pinning maglev vehicle, vibration is inevitable caused by track irregularities existence. By interacting with the permanent magnet guideway (PMG) below vehicle, EMSD devices own the capability to reduce vehicle vibration and convert vibration energy to the induced current in coil, which can be captured to afford a practical power supply solvent for sensor and MicrocontrollerUnit networks. This paper proposed a simultaneous vibration suppression and energy harvesting system with EMSD and power management circuit for HTS pinning maglev vehicle. The equivalent lumped vibratory model for both HTS pinning maglev and primary suspension system coupled with EMSD are initially established, based on which the optimal arrangement and size of the EMSD coils located above the PMG are determined. The mathematical model derivation and test rig construction for the designed system are completed as well. Then, aiming at data smoothing and feature extraction for raw vibration and energy recovery signals, a novel Analogous Pooling Filtering Algorithm (APFA) utilizes the pooling-like process to extracts original data consisting of multiple points into two pairs of ordered pairs. Meanwhile, to cope with the trade-off relationship between system damping and energy collecting ability with external resistance variation, the entropy weight method containing regularization term in its cost function is introduced to determine the weights of these two indicators and generate a comprehensive evaluation indicator for system performance. The experimental results under different field cooling heights (FCHs) and domain vibration frequencies setting show that this designed system can recover 5.31 mW electricity power in about 9 s from vibration energy while simultaneous maintaining an average damping effect of 42.5% in the kilogram level of maglev module (4.6 kg) compared to the vehicle solely equipped with EMSD system, which mighty validates its feasibility. For a real size engineering prototype vehicle, this harvested energy could be enlarged to substantial 80 kW.