基于实时Linux系统的飞机刹车半实物仿真系统研究

【作者】 王健；

【导师】 谢利理；

【作者基本信息】 西北工业大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 通过目前我国飞机刹车系统的研究现状和实验测试手段的详细分析，考虑到仿真系统的实现条件和经济适应性，本文提出了一种基于实时Linux操作系统的飞机刹车系统半实物仿真设计方案，并给出了整个系统的软硬件实现过程。 论文首先分析了飞机滑跑的动力特性、起落架及载荷的影响、刹车装置的工作特性以及跑道与轮胎摩擦特性，建立了系统半实物仿真的整体数学模型。针对仿真计算机与实物设备的接口，完成了设备硬件接口电路和设备驱动S函数的程序设计，以及仿真系统中实时通讯网络的设计。 其次针对半实物仿真的实时性要求，利用Matlab实时工作间RTW，并结合实时Linux操作系统内核的特性，给出了系统半实物仿真软件的实时代码生成方法；以RTW的外部方式实现了基于TCP＼IP协议的实时网络通讯模块；利用Matlab提供用户自定义模型的S函数完成了Linux环境下多线程实时模块代码的设计。 另外，论文还较深入地研究了实时Linux系统支持SMP(对称多处理器)结构的并行计算的特性，介绍了基于并行消息传递接口MPI的并行程序编程，并以跑道模型中地面结合系数的遗传规划辨识方法为例，给出了地面结合系数模型参数估计的并行处理算法，有效地解决了仿真过程中复杂数学模型的实时解算问题。 最后，针对本文提出的实时Linux系统环境下半实物仿真设计方案，以典型飞机为例，对机刹车系统进行了仿真实验研究。实验结果表明：本文所提出了飞机刹车系统半实物仿真设计方案合理可行，利用地面结合系数的遗传规划并行算法得到的跑道模型能较真实地反映轮胎与跑道的变化特性，所得到的仿真结果也能较真实地反映飞机刹车的动态过程。更多还原

【Abstract】 The actual domestic statues of aircraft braking system study is analysed and the means of test have been compared. Considering the implementary conditions and the constraint of cost, a new aircraft braking hardware in the loop simulation system based on the Real-Time Linux system is designed, and the implementary process of the whole system in hardware and software.On the basis of analyzing dynamic characteristics of airplane slip, this paper sets up the ground adhesion coefficient-slip model, airplane dynamics model, the landing gears model, the brake equipments and the tire model etc. Aimed at the interface between the simulating computer to practicle hardware, the circuit of the hardware and software interface based on S-function is designed. Further more, the real time communication network of simulation system is completed.Secondly, aimed to characteristics of simulation system in real-time process, an scheme is given to generat the code for real-time simulation by Matlab\RTW. At the same time, a real-time network is built by Matlab\RTW on external customer mode. It is designed by S-function tools in Matlab that include the module of mulitithread on Linux OS.Moreover, the characteristics of parallel computation with symmetric multiple processors construction is discussed in details, and the method to build the parallel program with MPI(message passing interface) is introduced. An parallel arithmetic of evolution is applied to the model of frictional characteristics, and solved the real-time computation of complicated mathematical models in system simulation.Finally, according to the scheme of airplane braking simulation system, a experiment of an airplane braking system is given, and the results indicate that the experimental platform of the HIL simulation system of the aircraft brake is feasible, and the runway model improved via the parameters identified by genetic programming based on evolutional computation can describe the real frictional characteristics. The whole performance of the anti-skid braking system is demonstrated satisfyingly by the platform.更多还原