航空发动机教学实验视景仿真系统

【作者】 赵琳；

【导师】 刘振侠；

【作者基本信息】 西北工业大学 ， 人机与环境工程， 2007， 硕士

【摘要】 实践环节在加深学生理解理论知识方面起着重要作用，目前在航空发动机专业存在教学设备陈旧、实验经费高昂的问题已难以满足学生在学习过程中的实践需求和保证教学质量。随着计算机技术的进步，虚拟现实技术(Virtual Reality，简称VR)在教育领域开始广泛的应用，使得多媒体教学从二维平面教学变成三维立体交互的、境界逼真的教学环境，这对调动学生的学习积极性和培养学生的动手能力都将起到积极作用。 论文以航空发动机专业的教学和实验为研究对象，建立了航空发动机教学实验视景仿真系统。从航空发动机的结构和气动特性两方面内容为切入点，对系统进行了详尽的需求分析，建立数字化的三维虚拟航空发动机实验室，从而实现发动机结构的虚拟装配，发动机试车台实验仿真，发动机工作时的运转情况模拟，流场仿真实验等多个实验教学内容。 论文深入探讨了基于MultiGen Creator/Vega的视景仿真核心技术——三维实时动态建模技术和视景仿真驱动，实现了航空发动机实验室视景仿真功能；讨论了基于数据手套的虚拟手技术和碰撞检测技术，完成了通过数据手套实现发动机模型的解剖和组装的人机交互功能，体现了虚拟现实的强交互性特点；讲述了立体成像原理，提出了采用偏振技术的大屏幕立体显示系统，为实现虚拟现实的视觉沉浸感提供了硬件平台；分析了流线的生成原理，提出通过线元的方式来模拟流体质点的运动轨迹的显示方法。本文在对上述虚拟现实关键技术进行详尽论证的基础上，结合航空发动机原理知识与发动机试车实验数据，成功开发了航空发动机教学实验仿真系统。 最终建立的航空发动机教学实验视景仿真系统是一个具有一定沉浸感、交互能力、启发构思的信息环境，使学生能更为直观地了解航空发动机内部结构和工作过程，加深对发动机试车过程的认识，掌握在不同工作状态下发动机特性参数变化情况，加强对发动机原理的理解。本文工作对于航空发动机教学的数字化、现代化建设具有一定的理论意义和重要的应用价值。更多还原

【Abstract】 Practice teaching plays a very important role in comprehending and mastering theory knowledges, however, it can’t satisfy students’ practice requirement and improve teaching qulity because of out-of-date instructional instruments and expensive experiment fund in aircraft major. With the development of computer, Virtual Reality is to be used widely in education region. Virtual reality turns 2-D teaching environment into interactive and realistic 3-D teaching environment, so that it contributes the study activation and hands-on capacity of students.The investigated subject presented herein focuses primarily on teaching and experiment, and scene simulation system of aero-engine teaching experiments are set up. Particular analyses of this system are completed from the structure and aerodynamic characteristic, so that three-dimensional virutal aero-engine laboratory could be built, and many experiments teaching will be performed, such as, the virtual assembly of engine, the experiment simulation of test bay, the simulating of engine working and the experiment simulation of flow field, etc .The ability of scene simulation in the aero-engine experimental laboratory is carried out by the three dimension dynamic model building and scene simulation driver, which is the core technique of scene simulation based on MultiGen Creator/Vega; the interactive function which completing descerption and assemblage of aero-engine model is performed by the virtual hand based on the data gloves and collision detection, showing the strong characteristic on the interaction of Virtual Reality; the principle of the stereo-vision is introduced and the large screen adopting the polarization is put forward, which supply the hardware platform for the visual immersion of the Virtual Reality; the principle of streamline’s generation is analyzed, the visual method for the pathline of the fluid material partical using the line element method is presented. The paper develops successful simulation system for the instructional laboratory system on the aero-engine, based on the demonstration detailed illuminated above and the principles of the aero-engine, as well as the firing test data.更多还原