Magnetorheological landing gear: 1. A design methodology

Abstract

Aircraft landing gears are subjected to a wide range of excitation conditions, which result in conflicting damping requirements. A novel solution to this problem is to implement semiactive damping using magnetorheological (MR) fluids. This paper presents a design methodology that enables an MR landing gear to be optimised, both in terms of its damping and magnetic circuit performance, whilst adhering to stringent packaging constraints. Such constraints are vital in landing gear, if MR technology is to be considered as feasible in commercial applications.The design approach focuses on the impact or landing phase of an aircraft's flight, where large variations in sink speed, angle of attack and aircraft mass makes an MR device potentially very attractive. In this study, an equivalent MR model of an existing aircraft landing gear is developed. This includes a dynamic model of an MR shock strut, which accounts for the effects of fluid compressibility. This is important in impulsive loading applications such as landing gear, as fluid compression will reduce device controllability. Using the model, numerical impact simulations are performed to illustrate the performance of the optimised MR shock strut, and hence the effectiveness of the proposed design methodology. Part 2 of this contribution focuses on experimental validation.

Dynamic Modeling and Parameter Identification of Magnetorheological Shock Absorber

“…[1][2][3][4][5] . Because of the special characteristic of magnetorheological fluid, it has a good prospect in terms of shock absorption.…”

Aircraft Landing Gear Embedded Buffer Controller Design Based On Magneto-Rheological Fluid

“…Carlson J D [4] has put forward a kind of suspension system of automobile magneto rheological damper that used for land transport; Gordaninejad F[5] has developed a multi-function and controllable and semi-active magneto rheological damper that used for high speeding automotive. Aiming at the application of magneto rheological damper in automobile suspension, the magneto rheological damper was applied to aircraft landing gear and was controlled by the DSP processor, the buffer based on magneto rheological damping in aircraft landing process has a smaller impact load and requires less stroke space [6]. In this paper, the magneto rheological fluid uses in aircraft landing gear and the magneto rheological buffer system is used as the buffer device of aircraft landing gear, this paper design a hardware circuit with the DSP as the core of the control system, the performance and feasibility of designed can meet the requirements [7].…”

Vibration Attenuation of Magnetorheological Landing Gear System with Human Simulated Intelligent Control

“…To attenuate the landing impact transmitted to aircraft, some active or semiactive types of landing gear systems have been suggested in aircrafts. One of the most attractive candidates to formulate an adaptive landing gear is to use magnetorheological (MR) fluid absorber because of its fast response characteristic to magnetic field, compact size, and, hence, wide control bandwidth [1][2][3].…”