Nonlinear dynamic response and global stability of an air compressor vibration system

Abstract

This study proposes a strategy for the vibration isolation mounting of an air compressor to attenuate the vibration near the primary resonance region by using a system with dynamic negative stiffness. The vibration system is modelled as a parametric pendulum system. The nonlinear dynamic responses, including the global stability of the air compressor vibration system, are investigated analytically. The efficiency of the proposed vibration isolation strategy is numerically demonstrated over the original device. To analyse the bifurcation of the nonlinear response of the pendulum system, the phase portrait, bifurcation diagram and maximum Lyapunov exponent of the pendulum system are obtained numerically. Furthermore, the Floquet multiplier level is obtained by solving the perturbation equation numerically and can be used to determine the global stability of the air compressor vibration system.

Electromagnetic Torque Components Analysis of Ultra-High-Speed Permanent-Magnet Synchronous Motor for Fuel Cell Air Compressor

“…With the development of high-power fuel cell systems in fuel cell vehicles [1][2][3][4], ultrahigh-speed electric air compressors (UHSEAC) with high pressure ratio and flow rate have been widely studied [5,6]. However, UHSEAC need to be modulated in seconds, which excites the speed to produce intense fluctuations [7,8]. The speed fluctuation of the UHSEAC is generated by the influence of the ultra-high-speed permanent magnet synchronous motor (UHSPMSM) electromagnetic torque components [9,10].…”