Abstract
As part of the Fp7 Clean Sky Project, a linear magnetic gear prototype, called Z-transmitter, for aerospace application was designed, built, and tested. It demonstrates a maximum force capacity of 4700 N at 25°C and 4500 N at 90°C. Force ratio between slow and fast stages remains constant and equal to the design value: 7.0. The behavior of the real Z-transmitter as a mechanical impedance matching device when any stiffness is attached to the fast stage including the limit cases of a blocked fast stage or a free to move fast stage is experimentally explored. Although the real Z-transmitter deviates from the ideal, frictionless and massless, device, it still provides an impedance matching effect large enough to potentially become an extremely useful technology for vibration control when combined with other elements such as dampers, springs, or active elements.
Highlights
Open rotor engines present a huge potential for reductions in fuel consumption and pollution relative to turbofan engines of equivalent thrust
Fast Stage Blocked-Maximum Force, Stiffness, and Experimental Force Ratio. Both stator and fast stages were tightly fixed to the structure
A mechanical impedance matching device based on a linear magnetic gear, so called Z-transmitter, has been developed
Summary
Open rotor engines present a huge potential for reductions in fuel consumption and pollution relative to turbofan engines of equivalent thrust. The development and use of these engines mounted on the fuselage are conditioned by the availability of a technology for effectively reducing the transmission of vibrations to the aircraft structure. The frontiers for vibration isolation engineering are currently hard to expand. The biggest challenge is to find a vibration technology capable of providing an optimum performance at both low and high frequency ranges without significantly increasing the cost or weight of the system ([1] and references therein). Well known classical vibration isolation is based on the use of very low stiffness combined with large masses to reduce the resonant frequency of the system [2]. Passive vibration isolation systems are typically used in a great range of applications to provide high performance and stability without the need for external power. Magnetic damping is a passive damping solution based on induction of electrical eddy currents [3]
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