计算机辅助工业设计（CAID）技术研究与展望

本文论述了计算机辅助工业设计（ＣＡＩＤ）的基本内涵，技术研究现状及其发展趋势，阐明了ＣＡＩＤ将使工业设计朝着多元化、优化、一体化的方向发展，使人机交互方式更加自然，创新设计的手段更为先进，有效。     

Si含量对Fe-Si合金渗碳处理组织和性能的影响

以Fe-Si二元合金为基体进行表面渗碳处理,研究了Si含量对渗碳层组织、硬度及耐磨性的影响。结果显示基体中的Si原子在渗碳过程中氧化形成SiO2沿奥氏体晶界分布,随Si含量增加,SiO2含量增加并呈连续网状分布。渗碳处理后Fe-Si合金表面硬度在64HRC以上,硅原子对渗碳过程产生阻碍作用,渗碳有效硬化层深度随Si含量增加显著降低。干摩擦条件下Fe-Si合金渗碳层抗平面滑动摩擦磨损性能随Si含量增加逐渐提高,Fe-3%Si合金耐磨性高于高铬铸铁。     

星载FlexRay总线应用层传输方法研究

现代卫星星上综合电子分布式拓扑结构,作为电子系统信息交互媒介的数据总线,其性能直接影响着星上电子系统的信息交流与共享。文章选择了新一代车载FlexRay总线作为星上电子系统数据总线,结合星载应用,阐述了FlexRay总线的数据帧结构,给出了卫星应用FlexRay总线静态段时隙和动态段"微时隙"大小的计算方法,并定义了FlexRay总线动态段、静态段的时隙参数。最后,分析了星上电子系统的工作模式,配置了FlexRay总线星上时隙。此应用层传输方法能够满足卫星应用FlexRay总线的通信实时性和稳定性要求。     

高性能环氧树脂配方研究

研制出一种用于纤维增强复俣材料基体的环氧树脂配方体系。浇注体力学性能良好，其用于φ１５０ｍｍ压力容器缠绕，得到了比较令人满意的结果，容器特性系数ＰＶ／Ｗ平均值为３７．４０ｋｍ，其最大值为３９．１５ｋｍ。     

Mars Global MHD Predictions of Magnetic Connectivity Between the Dayside Ionosphere and the Magnetospheric Flanks

Atmospheric photoelectrons have been observed well above the ionosphere of Mars by the ASPERA-3 ELS instrument on Mars Express. To systematically interpret these observations, field lines from two global MHD simulations were analyzed for connectivity to the dayside ionosphere (allowing photoelectron escape). It is found that there is a hollow cylinder behind the planet from 1–2 R _M away from the Mars-Sun line that has a high probability of containing magnetic field lines with connectivity to the dayside ionosphere. These results are in complete agreement with the ELS statistics. It is concluded that the high-altitude photoelectrons are the result of direct magnetic connectivity to the dayside at the moment of the measurement, and no extra trapping or bouncing mechanisms are needed to explain the data.     

玻璃钢/Nomex蜂窝夹层结构P频段接收天线的成型工艺研究

简述了P频段接收天线的组成,详细介绍了P频段接收天线载体的成型工艺方案,对成型模具设计、材料选择及特性、成型工艺等方面的内容进行了重点介绍,并且对产品成型过程中的技术重点及难点进行了论述分析。经最终检测,产品的各项性能均满足设计指标要求。     

对接机构的涡流阻尼器阻尼力矩的有限元仿真和试验分析

涡流阻尼器可以很好吸收航天器交会对接时产生的碰撞能量,其阻尼力矩直接关系其对碰撞能量的吸收,但没有通用的阻尼力矩计算公式.通过对研发的对接机构用涡流阻尼器样机的有限元仿真和实验,分析其阻尼力矩.介绍了对接机构的涡流阻尼器样机的结构、2D和3D电磁场有限元仿真模型和阻尼力矩测试系统,分析了涡流阻尼器的磁极对数、转子材料导电率、转子长度、转子厚度、转子平均直径对阻尼力矩的影响,给出了阻尼力矩的计算公式.计算结果表明,对铝合金转子涡流阻尼器样机,阻尼力矩的计算值与实测值误差小,对铜合金转子涡流阻尼器样机,阻尼力矩的计算值与实测值误差较大.分析结果有助于对接机构用涡流阻尼器的研制.     

物流作业成本的计算系统及其开发

为了有效控制商业企业的物流成本,采用作业成本计算法分析物流作业及成本动因,计算物流成本。设计物流成本计算的逻辑流程,分析物流作业成本计算系统中的资源、作业与成本动因等相关概念,开发物流作业成本计算的程序,并以X公司为例,说明物流作业成本法的可操作性。作业成本计算法有助于企业准确计算并控制物流成本。     

改善铷原子钟物理部分温度系数的研究

铷原子钟的温度系数是决定其长期频率稳定度的关键因素,物理部分的温度系数又是铷原子钟温度系数的重要组成部分.为了改善物理部分的温度系数,在理论分析的基础上开展了试验研究,结果表明:提出的改善物理部分温度系数的措施是有效的.这对于进一步提高星载铷原子钟频率稳定度具有积极作用.     

Tracking characteristics of tracer particles for PIV measurements in supersonic flows

The tracking characteristics of tracer particles for particle image velocimetry (PIV) mea-surements in supersonic flows were investigated. The experimental tests were conducted at Mach number 4 in Multi-Mach Wind Tunnel (MMWT) of Shanghai Jiao Tong University. The motion of tracer particles carried by the supersonic flow across shockwaves was theoretically modelled, and then their aerodynamic characteristics with compressibility and rarefaction effects were evalu-ated. According to the proposed selection criterion of tracer particles, the PIV measured results clearly identified that the shockwave amplitude is in good agreement with theory and Schlieren visu-alizations. For the tracer particles in nanoscales, their effective aerodynamic sizes in the diagnostic zone can be faithfully estimated to characterize the tracking capability and dispersity performance based on their relaxation motion across oblique shockwaves. On the other hand, the seeding system enabled the tracer particles well-controlled and repeatable dispersity against the storage and humidity.