Abstract
Facing the design difficulty and risk of aircraft landing gear, the fluid similarity theory and model experiments are used to predict large prototype’s property, which provide guidance for hydraulic designation and selection to reduce risk. Firstly, the matrix method is used to establish the fluid similarity relationship between the prototype and the model’s luffing mechanism, and the above conclusions are used to design the prototype’s hydraulic system. Secondly, the luffing mechanism’s dynamical model with accumulator was established, the initial motion condition was set, and the pressure’s similarity ratio is obtained by simulation method. Finally, the dynamic model and similarity ratio about time, velocity and pressure are verified by the prototype and model’s experimental data.
Highlights
Aircraft landing gear is an important aircraft load bearing mechanism, and the aircraft landing gear include luffing cylinder and hoisting leg, as shown in Fig.1. [1] In history, there have been many design failures on the aircraft landing gear, and the mechanism can’t bear load
All of the above researches are based on the well-known equations, but the fluid’s similarity research and its application in aircraft landing gear are rare
Our contribution is to establish the fluid similarity theory by computational fluid dynamics method and fluid similarity theory; The theory was verified by simulation and experiments
Summary
Aircraft landing gear is an important aircraft load bearing mechanism, and the aircraft landing gear include luffing cylinder and hoisting leg, as shown in Fig.1. [1] In history, there have been many design failures on the aircraft landing gear, and the mechanism can’t bear load. Aircraft landing gear is an important aircraft load bearing mechanism, and the aircraft landing gear include luffing cylinder and hoisting leg, as shown in Fig.. [1] In history, there have been many design failures on the aircraft landing gear, and the mechanism can’t bear load. In order to reduce the design difficulty and risk, it is urgent and necessary to use the shrunken model to predict the large prototype’s performance. The similarity research has important theoretical and engineering value. All of the above researches are based on the well-known equations, but the fluid’s similarity research and its application in aircraft landing gear are rare. Our contribution is to establish the fluid similarity theory by computational fluid dynamics method and fluid similarity theory; The theory was verified by simulation and experiments
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