II 华中科技大学硕士学位论文 Abstract The pilot control surfaces through the hydraulic booster, the performance of hydraulic booster strongly influenced the stability of aircraft. Severe booster jitter would cause the airc-raft longitudinal oscillation, seriously affected aircraft control, even leaded to accidents. Minor booster jitter although wasnt easy found, but it affected the stability of high-speed aircraft and the control accuracy of military aircraft, so the research on hydraulic booster was very important to the design of aircraft. But the research on hydraulic booster werent intact in the domestic. This paper mainly analyzed the static characteristics and dynamic performances of the hydraulic booster for aircraft, simulated and studied its main influencing factors on performance. These all provided foundation for design and study of hydraulic booster. This article main included the following aspects. Firstly, based on hydraulic fluid dynamics, control technology and analysis the working principle of hydraulic booster, the numerical analysis on static characteristics and dynamic performances of the hydraulic booster were finished., then the result were compared with actual graph, and the method of improving the performance were given. Secondly, based on a large number of literatures, this paper reasonably simplified the working model of hydraulic booster, built the nonlinear mathematical model, linearised it and analyzed its stability. This article focused on simulation of nonlinear model of hydraulic booster by MATLAB/SIMULINK and analysis on the effect of power ratio valve port, valve overlap form shape, system pressure on dynamic performances. The innovation of this paper were as follows: analyzed and computed the static characteristics and dynamic performances of the hydraulic booster, and then studied the influencing factors were analyzed and discussed. Then studied the stability of hydraulic booster by routh stability criterion, nyquist stability criterion, bode stability criterion; Analyzed the effect of the change of several structural preferences on dynamic performances, and simulated and studied it by SIMULINK. The result of this paper provided basic theory for the structure optimization, products research and development and application of hydraulic booster. Keywords: Flight control system, Hydraulic booster, Power ratio, Valve port, Dynamic simulation III 华中科技大学硕士学位论文 目 录 摘 要 . I ABSTRACT . II 1 绪论 1.1 课题研究背景 . (1) 1.2 飞机操纵系统 与助力器 发展 . (2) 1.3 国内外飞控系 统发展现 状 . (6) 1.4 论文的主要工 作 . (9) 2 液 压助力 器原理与 连接分析 2.1 液压助力器原 理分析 . (10) 2.2 液压助力器连 接方式 . (13) 2.3 本章小结 . (16) 3 助 力器性 能分析 3.1 静态性能分析 . (17) 3.2 动态性能分析 . (21) 3.3 本章小结 . (27) 4 助 力器模 型建立 4.1 SIMULINK 介绍 . (28) 4.2 仿真算法及步 长的选择 . (30) 4.3 数学模型的建 立 . (32) 4.4 线性模型的传 递函数 . (35) 4.5 非线性仿真模 型 . (36) 4.6 本章小结 . (37) 5 模 型的仿 真与分析 IV 华中科技大学硕士学位论文 5.1 线性模型分析 . (38) 5.2 非线性模型的 仿真 . (41) 5.3 参数优化 . (47) 5.4 本章小结 . (48) 6 总 结与展 望 6.1 总结 .