Single action control for oleo-pneumatic shock absorbers in CS-23 aircraft

IF 5 1区工程技术 Q1 ENGINEERING, AEROSPACE

Aerospace Science and Technology Pub Date : 2025-02-20 DOI:10.1016/j.ast.2025.110078

Felix Willich , Jadran Vrabec , Florian Holzapfel

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引用次数: 0

Abstract

A novel open-loop semi-passive control concept for oleo-pneumatic shock absorbers of CS-23 aircraft is presented. This concept enables the control of the damping characteristics in diverse impact scenarios with a single configuration before touchdown. This approach maintains low energy consumption and allows for the application of slower actuators. The damping properties are optimized to achieve the best possible uniform deceleration during compression in various impact scenarios. Integration of this concept is focused on a trailing arm suspension, where the controller takes the interaction between the wheel and the ground at the point of impact as well as the orientation change of the shock absorber during deflection into account. This approach shows minimal maximum load in systems with uniform deceleration curves. For uncontrolled systems, the guaranteed overshoot causes the restoring forces to amplify the tendency for a bounced landing, if the recoil is not effectively damped, especially when ground forces or lift are present. Therefore, the shock absorber is augmented with a coned metering pin to provide increased damping at low deflections. To ensure a comparable analysis of the system regarding rebound tendency, a decompression efficiency criterion is introduced, which can be determined via drop tests. The influence of the metering pin and the single configuration control (separate and combined) on the system's performance (minimal load and rebounce tendency) is examined under varying load conditions. It is shown that the semi-passive concepts improve overall performance across various load scenarios.

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.