【作者】 赵谦；

【导师】 陈明；

【作者基本信息】 哈尔滨工业大学 ， 机械工程， 2011， 硕士

【摘要】 随着航空事业的迅猛发展,无人驾驶飞机(UAV)的出现引起世界各国高度重视。其中,小型无人机因为在军事应用和民用中具有独特优势,已成为热门研究领域。电动舵机是控制小型无人机的核心部件,其结构小型化、轻型化和输出大扭矩是小型无人机技术发展的重要趋势之一。本课题是要针对电动舵机在小型无人机上的应用特点研制一台小体积、大速比、大扭矩、高精度、高效率和长寿命的配套减速装置。本文通过传动方案设计、结构设计、精度分析、计算机仿真和绘制工程图纸来完成这项设计工作。传动装置的体积重量、减速比、效率、寿命和输出扭矩这几项参数要同时满足前述的高要求往往比较困难。根据电动舵机减速器的要求对几种拟采用的传动型式进行速比和效率的分析,最后确定以第一级直齿锥齿轮传动和第二级3K(II)型行星传动的组合作为减速器的传动方案。对传动方案进行了设计,并通过VB编程对其传动的参数进行计算。因为电动舵机实质上是一个位置伺服系统,减速器的回差会直接影响整个系统的稳定性和灵敏度。本文详细分析了回差的来源,分别通过最大值法和统计概率方法定量的计算回差,了解各种误差对传动精度的影响程度,通过合理的精度分配更加有效地控制回差。减速器的结构设计包括材料的选择、处理工艺和强度、刚度计算等。在结构设计的基础上,用Pro/E建立减速器的虚拟样机,应用机构仿真模块对减速器进行干涉检查和运动仿真。根据干涉检查结果调整减速器的结构,通过运动仿真结果验证结构设计的正确性。用ANSYS软件对减速器主要部件的强度和模态进行有限元分析,对行星传动的各啮合副进行静力学有限元分析。根据仿真结果调整减速器的结构,使设计达到优化。最后基于上述内容,确定减速器结构的所有参数,绘制减速器的全套工程图纸,完成电动舵机减速器的设计。更多还原

【Abstract】 Unmanned aerial vehicle (UAV) has attracted worldwide attention with the rapid development of aviation. And Micro UAV has been a hot field, thanks to its unique advantages and extensive applications in military and civil use. The electric steering engine is a core of components which control Micro UAV. Smaller volume, smaller weight and stronger torque output is the development trend of the electric steering engine.This paper focus on developing a gear decelerator, which has many features such as small size, big transmission ratio, stronger torque, high precision, high efficiency and longevity.To design this type of decelerator which can meet these stringent requirements at the same time is very difficult. Several proposed patterns of transmission were analyzed on transmission ratio and efficiency in order to choose an appropriate type. Because of higher transmission ratio and smaller volume, bevel gear transmission combined with 3K(II) type of planetary transmission is chosen as the final solution. This paper also programmed to calculate parameters of gear transmission with Visual Basic.Because of electric steering engine is essentially a servo system, the backlash of decelerator will directly affect stabilization and sensitivity of the servo system. This paper did a detailed analysis of factors that affecting backlash and calculated the backlash by maximum value method and statistical method respectively. Furthermore, Finding out how various factors affect the precision of transmission according to calculations, and controlling the backlash more effectively by reasonable distribution of precision.The structural design of gear decelerator includes the choice of material, technology for processing, calculation of intensity and rigidity. Based on the structural design, establish a virtual prototype decelerator in Pro/E. And interference checking and kinematics simulation of the virtual prototype decelerator will be completed in Mechanism simulation module of the Pro/E. Adjusting the structure of decelerator according to results of interference checking. Through results of kinematics Simulation, verifying calculation of planetary-gear transmission. Using ANSYS software, the main components of gear decelerator were analyzed on strength and modal. Besides, the meshing of the planetary gear vice was analyzed. The result of finite element analysis will be compared with theory in order to optimize the structure of gear decelerator.Finally, based on all of above, determine all of the parameters of decelerator. Complete the design of decelerator with drawing a full set of drawings.更多还原