Attenuation of Vibrations in Aircraft Landing Gears due to Impact Loads Using Magnetorheological Dampers

飞机在着陆时受到冲击载荷的影响。冲击载荷的强度取决于进近速度、着陆条件、控制面展开、跑道粗糙度等因素。由此产生的振动会影响乘客的舒适度和结构的完整性。提出的研究目标是研究起落架系统通过结合磁流变阻尼器来减少振动的性能。飞机起落架减震器的基本功能是吸收飞机降落时机体框架的冲击动能。目前使用的是油-气减震器系统，本质上是气体和油形成流体弹簧和减震器的减震器。它们有一个通过流体流动孔延伸的计量销，它可以改变孔的面积。通过塑造计量销，在动态载荷下调整支撑载荷为相当恒定。如果阻尼能根据载荷和进近要求（如飞机的不同重量或着陆时的不同下沉速率）而变化，那将是理想的。

Aircrafts are subject to impact loads during landing. The intensity of the impact loads depends on the approach velocity, landing conditions, control surface deployment, runway roughness etc. The resulting vibrations can affect passenger comfort and structural integrity. The objectives of the proposed research are to study the performance of the landing gear system in reducing vibrations by incorporating magnetorheological fluid dampers. The basic function of the shock absorber in aircraft landing gears is to absorb the impact kinetic energy of the aircraft body frame during landing. Oleo-pneumatic shock absorber system, which are essentially shock absorbers with gas and oil forming a fluid spring and damper, are currently used. They have a metering pin extending through the fluid flow orifice, which can vary the orifice area. By shaping the metering pin the strut load is adjusted to be fairly constant under dynamic loading. It would be ideal if the damping could be varied according to the load and approach requirements such as for different weight of the aircraft or different sink rate at the time of touchdown.