Abstract
The landing gear system has the task of bearing the weight of the aircraft, bearing the impact load, and providing the braking function in the process of the aircraft taxiing, take-off, and landing. There are many parameters in the aviation brake pressure servo valve-controlled cylinder system (ABPSVCS) which will have a significant influence on the dynamic behavior of the system. Sensitivity analysis is an effective method to analyze the influence of system parameters on system characteristics, especially for nonlinear systems. The trajectory sensitivity method based on the description of system state space is used for the parameter sensitivity analysis of the ABPSVCS. By grouping various parameters for sensitivity analysis, the law of parameter sensitivity of each group is obtained, and the results are verified by experiments. The results can lay a theoretical and experimental foundation for the related research work of the aviation brake pressure servo valve.
Highlights
In order to conduct the sensitivity analysis of the aviation brake pressure servo valve-controlled cylinder system (ABPSVCS), the system dynamic model in this paper must be written in the general form of state space as shown in Equation (1)
Since the dynamic model of the ABPSVCS is derived in the form of an incremental equation, it can be considered that all state variables at the initial moment are in zero state: x0 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] T
If the ratio of sensitivity indexa 2parameter between psensitivity s and Vh is analysis c2, according using system state space to= describe sensitivity was proposed; this paper studied simulation
Summary
Landing gear is an important part of the aircraft. It is mainly used to realize the functions of take-off, landing, ground taxiing, and parking, and to absorb and dissipate all kinds of energy generated by the aircraft in the process of landing and ground motion, such as vertical kinetic energy generated by the aircraft ground subsidence velocity, structural pendulum vibration during taxiing and energy generated by the uneven ground, and the horizontal kinetic energy of the aircraft to absorb and dissipate when the aircraft brakes. The landing gear needs to have good damping performance, good maneuverability, stability, and good braking performance when moving on the ground [1]. It must connect with the body reasonably and reliably, have good retractable reliability, and meet the protection requirements.
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