对电子工艺教学的思考

电子工艺课程的培养目标决定课程内容的选择.为了达到培养目标,在电子工艺课程中提出了强化实践教学的几个措施,把培养高综合素质人才的理念渗透到教学环节中,突显职业技术教育的优势.     

Gaussian pigeon-inspired optimization approach to orbital spacecraft formation reconfiguration

With the rapid development of space technology, orbital spacecraft formation has received great attention from international and domestic academics and industry. Compared with a single monolithic, the orbital spacecraft formation system has many advantages. This paper presents an improved pigeon-inspired optimization(PIO) algorithm for solving the optimal formation reconfiguration problems of multiple orbital spacecraft. Considering that the uniform distribution random searching system in PIO has its own weakness, a modified PIO model adopting Gaussian strategy is presented and the detailed process is also given. Comparative experiments with basic PIO and particle swarm optimization(PSO) are conducted, and the results have verified the feasibility and effectiveness of the proposed Gaussian PIO(GPIO) in solving orbital spacecraft formation reconfiguration problems.     

Basic performance of BeiDou-2 navigation satellite system used in LEO satellites precise orbit determination

The visibility for low earth orbit（LEO） satellites provided by the BeiDou-2 system is analyzed and compared with the global positioning system（GPS）. In addition, the spaceborne receivers＇ observations are simulated by the BeiDou satellites broadcast ephemeris and LEO satellites orbits. The precise orbit determination（POD） results show that the along-track component accuracy is much better over the service area than the non-service area, while the accuracy of the other two directions keeps at the same level over different areas. However, the 3-dimensional（3D） accuracy over the two areas shows almost no difference. Only taking into consideration the observation noise and navigation satellite ephemeris errors, the 3D accuracy of the POD is about30 cm. As for the precise relative orbit determination（PROD）, the 3D accuracy is much better over the eastern hemisphere than that of the western hemisphere. The baseline length accuracy is 3.4 mm over the service area, and it is still better than 1 cm over the non-service area. This paper demonstrates that the BeiDou regional constellation could provide global service to LEO satellites for the POD and the PROD. Finally, the benefit of geostationary earth orbit（GEO） satellites is illustrated for POD.     

飞航导弹变结构过载控制方案研究

对飞航导弹的变结构过载控制进行了研究,提出了以过载、角加速度和角速度构造滑模面的工程易实现的方案。同时,应用根轨迹方法,进行了控制参数的优化设计。最后,针对两类典型飞航导弹模型,将"过载 角加速度 角速度"方案与"过载 角加速度"方案进行仿真比较。结果表明"过载 角加速度 角速度"方案适用范围更广、控制效果更好。     

支持并行工程的航发叶盘约束管理系统

为解决航发研制过程由串行到并行的转变而引起的问题,全面表达和维持航发研制过程中各多功能小组及小组成员间应满足的关系,本文分析了航发研制中的约束网络层次结构,建造了一个支持并行设计的约束管理系统,并以整体叶盘为例,创建了叶盘约束网络,应用于整体叶盘的建模系统,模拟多功能小组协同工作,在设计阶段就反映下游活动的需求,保证设计一次成功。这项工作为在航发研制中应用并行工程提供了支持工具。     

DYNAMIC RESPONSE ANALYSIS OF CARRIER-BASED AIRCRAFT DURING LANDING

In view of the complexity of landing on the deck of aircraft carrier, a systematic model, composed of six- degree-of-freedom mathematic model of carrier-based aircraft, four-degree-of-freedom model of landing gears and six-degree-of-freedom mathematic model of carrier, is established in the Matlab-Simulink environment, with damping function of landing gears and dynamic characteristics of tires being considered. The model, where the car- rier movement is introduced, is applicable for any abnormal landing condition. Moreover, the equations of motion and relevant parameter are also derived. The dynamic response of aircraft is calculated via the variable step-size Runge-Kuta algorithm. The effect of attitude angles of aircraft and carrier movement during the process of landing is illustrated in details. The analytical results can provide some reference for carrier-based aircraft design and main- tenance.     

高校体育课教学心得

高校体育课教学应从学生的思想入手,不断提高学生对体育课的认识,同时要认真施教,严格管理,采用灵活多变的教学方法,调动学生的积极性,并帮助学生树立掌握运动技能的信心,从而更好地完成课的任务,达到教书育人的目的。     

关于《电路制作》课程教学的探讨

绝大多数学生迈入校门时,其实践动手能力都很薄弱,学校和教师有责任去引导督促、培养学生的工程实践能力和创新能力。为了落实学校教改计划,从培养学生工程实践能力和创新能力的角度改革实践教学建设,安排教学内容,调整实践环节,我系对03级所有专业的学生新开设了《电路制作》这门实践课程。1课程教学目标该课程要求学生掌握各类实用电子元器件、电工器材的电气符号的识别与应用;掌握分析电路的技能与技巧;了解网络表在PCB图中的作用;理解元件封装的实际意义;掌握手工制作印制电路板的工艺与流程;了解表面贴装技术;理论联系实际、培养学生…     

星相数据的姿态确定

本文给出了利用卫星拍摄的星相数据计算卫星姿态的数学关系式和计算方法。经实际使用证明这种方法是正确的。