Analysis and Control of a Magnetorheological Landing Gear System for a Helicopter

作者：Choi Young Tai; Robinson Ryan; Hu Wei; Wereley Norman M^*; Birchette Terrence S; Bolukbasi Akif O; Woodhouse Jin

来源：Journal of the American Helicopter Society, 2016, 61(3): 032006.

DOI：10.4050/JAHS.61.032006

This study develops the design analysis and control of adaptive magnetorheological landing gear dampers (MRLGDs) to enable adaptive shock mitigation in a lightweight helicopter. MRLGDs were designed to achieve a desired stroking load of 4000 lb (17.8 kN) over a desired equivalent sink rate range of 6-12 ft/s (1.83-3.65 m/s). The design analysis at low equivalent sink rates, v(s) < 10 ft/s (3.05 m/s), was experimentally validated using ramp displacement inputs on a servo-hydraulic testing machine at low speed. To validate the analysis at high equivalent sink rates, v(s) > 10 ft/s (3.05 m/s), single damper drop tests were performed. Two force feedback control algorithms were developed to achieve the desired constant stroking load over the desired sink rate range, that is, (1) bang-bang current control and (2) continuous current control. The effectiveness of control algorithms was evaluated using both single damper drop tests and an iron-bird test setup with a landing gear system having a pair of forward and aft MRLGDs.

• 出版日期2016-7