转叶式舵机密封件在不同磨粒尺寸下的摩擦学特征研究

船舶转叶式舵机因体积小、功率密度高而逐渐替代传统的柱塞式舵机.然而,磨损过程中产生的磨粒常使叶片密封件产生异常磨损,引起密封失效,导致油压下降,造成转叶式舵机功能丧失.明晰叶片密封件与缸体内壁之间的摩擦磨损机理以及提取关键磨损特征是提高叶片密封件的磨损寿命和实现转叶式舵机智能故障诊断的关键.以常用于制作密封件的聚氨酯高...

Study on Tribological Characteristics of Rotary Vane Steering Gear Seals under Different Abrasive Particle Sizes

The ship rotary vane steering gears gradually replaced traditional plunger steering gears due to the small size and high power density. However， the wear particles generated during the friction processes often caused abnormal wear of the seals of rotary vanes， which caused seal failure and drop hydraulic oil pressure， and resulted in losing of the function of rotary vane steering gears. Clarifying the friction and wear mechanism between the vane seals and the cylinder and extracting their key wear characteristics were the keys to extend the service life and to realize intelligent fault diagnosis of the rotary vane steering gears. The polyurethane materials which commonly used to make seals were chosen as the research object to study the wear behaviors under different wear conditions. The results show that the characteristic values of friction coefficient， wear volume， wear morphology and vibration signals between polyurethane polymer and carbon steel ball gradually increase with the increase of iron particles size under hydraulic oil-lubricated， which indicates that the wear state is gradually worsening. It may provide an effective way for evaluating or predicting the wear state or failure modes of rotary vane steering gear seals by sensing tribological information， including the friction coefficient， abrasive particles size in the hydraulic oil， wear morphology， wear volume， vibration signals and other characteristics. This study may provide a theoretical basis for revealing the friction and wear mechanism of ship rotary vane steering gear seals， and provide a reference for realizing their intelligent monitoring and fault diagnosis.