液体运载火箭推进系统固有频率的通用化计算研究

为了能够快速有效地对各种构型的液体运载火箭可能出现的POGO振动问题进行初步分析,对液体运载火箭推进系统固有频率的通用化计算问题进行了研究。采用模块化的部件动力学方程进行通用化建模,并引入粒子群优化算法来解决通用化模型带来的高阶方程的求解问题。最后,针对某发动机液氧系统进行了固有频率计算,并讨论了粒子群优化算法的求解效率,以及蓄压器对固有频率的影响。研究成果可进一步应用于液体运载火箭POGO振动的稳定性分析及其抑制研究。

载人月球探测飞行器综合电子系统技术发展研究

针对载人月球探测飞行器数据种类多、数据量大、数据分布远的特点和高可靠性数据通信要求,通过调研国内外航天器综合电子系统发展趋势和系统分析载人月球探测任务的研制需求和技术特点,秉承网络一体化、计算通用化、执行集成化、软件APP化的设计理念,提出了全新的“统一管理-区域执行”两层分级控制综合电子系统架构,对高性能计算、时间触发网络、高集成采集驱动、分时分区操作系统等关键技术的研究目标和实施途径进行了详细阐述,应用于载人月球探测飞行器综合电子系统设计后,将有效提升自主健康管理和任务规划能力、功能密度、设计可靠性及有人参与的闭环控制能力。

Different Models of English as an International Language and Their Implications for Teaching Non-English Majors

This paper attempts to reveal and solve problems in language teaching after discussing the issues of language change. It first discusses different models of English in the context of globalization. With detailed analysis of their theoretical backgrounds, development and foundations, this paper classifies these models into three groups： dualism （i.e., dualic model）, trinalism （trinalic model） and monism （monic model）. Through comparison, Yoneoka’s English Umbrella Theory is found to be more comprehensive and is improved into a practical Revised English Umbrella （REU） with the notion of English as an International Language （EIL）. Second, the changing models in English education are briefly reviewed. Attention is paid to the Computer and Classroom-Based （CCB） Model of College English education because of new requirements for College English education. Students’ competence in cross-cultural communication is becoming more and more important in the EIL context. Finally, a modified CCB model is promoted with the REU, combining EIL and English Umbrella elements.