An Investigation on Tribological Properties of Graphene and MoS_2 Nanoparticles as Additives in Aviation Hydraulic Oil

摘要

With the development of large aircraft in the field of civilian and military, electro-hydrostatic-actuator (EHA) plays an importance role in the hydraulic system. There are some parts in the Electro-Hydrostatic-Actuator (EHA), containing linear oscillating motor, reciprocating pump and hydraulic actuator. Recently, some researchers [1-3] have proposed a novel linear oscillating motor, which can not only reduce the mover mass to improve the motor dynamics, but also leave more space for springs and bearings to achieve more compact size and improve the power density. However, due to start-stops condition and high frequency reciprocating motion, the sliding bearings, supporting mover tubes and submerged in the oil, tend to wear in the linear oscillating motor, which will cause the EHA efficiency to reduce. Some studies on hydraulic system have shown that failures are generally avoided or reduced by using suitable and efficient additives [2, 3]. An approach to improve the tribological performance of the friction pairs is the potential use of nanoparticle additives. Because having no influence on the center hydraulic system, the oil just pass through the novel linear oscillating motor which is self-system and relative independence of center hydraulic system, nanoparticle additives can be used as additives to improve the tribological performance of the sliding bearings in the linear oscillating motor.