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

使用磁流变阻尼器衰减由冲击载荷引起的飞机起落架振动

• 批准号: RGPIN-2015-04035
• 负责人: Bhat, Rama
• 金额: $ 1.6万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=708342
• 关键词: Attenuation; Vibrations; Aircraft; Landing; Gears

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. During landing, the aircraft wings still carry the bulk of the aircraft weight with the lift force. The objective is to optimize the progressive reduction in the lift such that the aircraft experiences a constant deceleration in the vertical direction. This in turn reduces the vibratory stresses in the structural components. The scientific approaches for the above studies are (i) Analytical solutions to the equations of motion of the system which is essentially one with time varying mass and damping properties, (ii) numerical simulation of the landing gear dynamics including the magnetorheological fluid dampers, and (iii) experimental studies on the MR damper component following a Hardware-in-the-loop approach. Novelty and expected significance of the work in better vehicle design: Magnetorheological fluid dampers change their damping property very quickly by the application of appropriate current to the MR fluid. Variation in stiffness can be achieved in the MR damper by introducing an accumulator and a valve. The technology has been very successfully applied in vehicle suspensions to control vibrations in a semi-active fashion. It is expected that similar vibration reduction can be achieved in aircraft structures also. HQP training will form a part of this research. MR fluid dampers in vehicle suspensions for semi-active control of ride vibrations have been found to be successful. Three Ph.D. students are working on different aspects of systems equipped with MR dampers. It is proposed to train 2 more Ph.D. students in the course of the proposed project

飞机在着陆期间可能会撞击负载。冲击负荷的强度取决于进速度，着陆条件，控制地面部署，跑道粗糙度等。产生的振动可能会影响乘客的舒适性和结构完整性。拟议的研究的目标是研究起落架系统的性能，以通过融合磁性流体阻尼器来减少振动。飞机起落架上减震器的基本功能是在着陆期间吸收飞机车身框架的影响动能。目前使用的是用气体和机油形成流体弹簧和阻尼器的胶质 - 肺电击吸收器系统，它们基本上是减震器。它们具有通过流体流孔延伸的计量销，可以改变孔口面积。通过塑造计量引脚，在动态载荷下调整了支撑杆负载以相当恒定。如果可以根据负载和进近要求（例如飞机的不同重量）或达阵时的不同水槽速率来改变阻尼，那将是理想的选择。 在着陆期间，飞机机翼仍然用升降力承载大部分飞机重量。目的是优化升降机的逐步减少，以使飞机在垂直方向上持续减速。这反过来降低了结构成分中的振动应力。 上述研究的科学方法是（i）对系统运动方程的分析解决方案，该方程基本上是一种具有变化的质量和阻尼特性，（ii）对起落架齿轮动力学的数值模拟，包括磁性流体抑制剂，以及（iii）对硬件inthe the-the-lope-in​​le-loop方法的MR DAMPERS的实验研究。 工作在更好的车辆设计中的新颖性和预期的意义：通过将适当的电流应用于MR流体，磁性流体阻尼器会很快改变阻尼特性。通过引入蓄能器和阀门，可以在MR阻尼器中实现刚度的变化。该技术已非常成功地应用于车辆悬架中，以半活性的方式控制振动。预计在飞机结构中也可以实现类似的振动。 HQP培训将构成这项研究的一部分。已经发现，在车辆悬架中，MR流体阻尼器对骑行振动的半活性控制已被发现成功。三博士学生正在研究配备阻尼器先生的系统的不同方面。有人建议培训2次博士学位。在拟议项目的过程中的学生