基于裂比的非晶合金永磁电机设计技术

非晶合金材料电磁性能优异,应用于电机领域能显著降低电机铁心损耗,提高电机效率。针对非晶合金材料的特点,基于永磁电机基本设计理论,推导了非晶合金电机铜耗与铁心损耗的解析表达式。基于非晶合金永磁电机损耗的解析表达式对非晶合金永磁电机裂比(定子内外径之比)、磁密比值(气隙磁密与铁心磁密之比)的设计进行了研究,得出了非晶合金永磁电机裂比、磁密比值的设计规律。在对非晶合金永磁电机设计规律研究的基础上完成了一台非晶合金永磁电机的设计并进行了试验。所做的研究对非晶合金电机的设计及优化具有一定的参考价值。     

基于石墨板的电子设备大功率器件散热方法研究

针对宇航电子设备大功率器件的散热路径进行了分析.对顶部散热的器件采用高导热石墨板、精确控制导热垫压缩量、增加导热路径等方式进行散热,对腹部散热的器件采用覆铜通孔等方式进行散热,并结合热仿真和温循试验,有效解决了大功率器件散热问题.     

基于矩阵光学的多程激光放大器准直系统模型分析

多程放大技术成为高功率固体激光装置的主要发展方向,对激光光路进行调试和维护,建立光路准直的数学模型和调整方案很有必要,采用矩阵光学方法,建立了多程放大自动准直系统数学模型,得出了远、近场光斑偏移量与调整量的解析表达式,验证了该自动准直系统光路原理及调整方法的可行性。     

密度变化时金属橡胶材料的非线性本构关系

以多孔材料理论为基础,干摩擦非线性理论为依据,并结合小曲梁模型建立金属橡胶材料的非线性本构关系,对空心圆柱形金属橡胶材料的静态试验结果进行拟合,得到非线性本构关系模型中的各项系数与密度的变化关系式,从而实现对该材料在密度发生变化情况下的本构关系的预估。     

PROBA-3 mission and the Shadow Position Sensors: Metrology measurement concept and budget

PROBA-3 is a space mission of the European Space Agency that will test, and validate metrology and control systems for autonomous formation flying of two independent satellites. PROBA-3 will operate in a High Elliptic Orbit and when approaching the apogee at 6·10⁴ Km, the two spacecraft will align to realize a giant externally occulted coronagraph named ASPIICS, with the telescope on one satellite and the external occulter on the other one, at inter-satellite distance of 144.3 m. The formation will be maintained over 6 hrs across the apogee transit and during this time different validation operations will be performed to confirm the effectiveness of the formation flying metrology concept, the metrology control systems and algorithms, and the spacecraft manoeuvring. The observation of the Sun’s Corona in the field of view [1.08;3.0]R_Sun will represent the scientific tool to confirm the formation flying alignment. In this paper, we review the mission concept and we describe the Shadow Position Sensors (SPS), one of the metrological systems designed to provide high accuracy (sub-millimetre level) absolute and relative alignment measurement of the formation flying. The metrology algorithm developed to convert the SPS measurements in lateral and longitudinal movement estimation is also described and the measurement budget summarized.     

Examining the use of the NeQuick bottomside and topside parameterizations at high latitudes

An examination of the high latitude performance of the bottomside and topside F-layer parameterizations of the NeQuick electron density model is presented using measurements from high latitude ionosonde and Incoherent Scatter Radar (ISR) facilities.For the bottomside, we present a comparison between modeled and measured B2Bot thickness parameter. In this comparison, it is seen that the use of the NeQuick parameterization at high latitudes results in significantly underestimated bottomside thicknesses, regularly exceeding 50%. We show that these errors can be attributed to two main issues in the NeQuick parameterization:(1) through the relationship relating foF2 and M3000F2 to the maximum derivative of F2 electron density, which is used to derive the bottomside thickness, and (2) through a fundamental inability of a constant thickness parameter, semi-Epstein shape function to fit the curvature of the high latitude F-region electron density profile.For the topside, a comparison is undertaken between the NeQuick topside thickness parameterization, using measured and CCIR-modeled ionospheric parameters, and that derived from fitting the NeQuick topside function to Incoherent Scatter Radar-measured topside electron density profiles. Through this comparison, we show that using CCIR-derived foF2 and M3000F2, used in both the NeQuick and IRI, results in significantly underestimated topside thickness during summer periods, overestimated thickness during winter periods, and an overall tendency to underestimate diurnal, seasonal, and solar cycle variability. These issues see no improvement through the use of measured foF2 and M(3000)F2 values. Such measured parameters result in a tendency for the parametrization to produce a declining trend in topside thickness with increasing solar activity, to produce damped seasonal variations, and to produce significantly overestimated topside thickness during winter periods.     

基于电容感测高温隔离触控模块的研制

电容式感测是一种低功耗、低成本且高分辨率的非接触式感测技术，适用于接近检测、手势识别和远程液位感测等。采用FDC2214电容式传感技术检测触控按键，有效去除干扰。将检测值通过IIC总线传送给MSP430单片机，使用自适应算法处理数据以确定某个物体是否在目标感应区域内，最远感应距离可达30cm。在工厂应用中可用厚玻璃窗实现对恶劣环境的隔离，人机交互时无需进入高温、灰尘、油渍等恶劣环境就可实现操控，保证了安全性并节省了成本。     

Statistical analysis of the ionospheric ion density recorded by DEMETER in the epicenter areas of earthquakes as well as in their magnetically conjugate point areas

Results of a statistical variation of total ion density observed in the vicinity of epicenters as well as around magnetically conjugated points of earthquakes are presented in this paper. Two data sets are used: the ion density measured by DEMETER during about 6.5?years and the list of strong earthquakes (M_W?≥?4.8) occurring globally during this period (14,764 earthquakes in total). First of all, ionospheric perturbations with 23–120?s observation time corresponding to spatial scales of 160–840?km are automatically detected by a software (64,287 anomalies in total). Second, it is checked if a perturbation could be associated either with the epicenter of an earthquake or with its magnetically conjugated point (distance?<?1500?km and time?<?15?days before the earthquake). The index Kp?<?3 is also considered in order to reduce the effect of the geomagnetic activity on the ionosphere during this period. The results show that it is possible to detect variations of the ionospheric parameters above the epicenter areas as well as above their conjugated points. About one third of the earthquakes are detected with ionospheric influence on both sides of the Earth. There is a trend showing that the perturbation length increases as the magnitude of the detected EQs but it is more obvious for large magnitude. The probability that a perturbation appears is higher on the day of the earthquake and then gradually decreases when the time before the earthquake increases. The spatial distribution of perturbations shows that the probability of perturbations appearing southeast of the epicenter before an earthquake is a little bit higher and that there is an obvious trend because perturbations appear west of the conjugated point of an earthquake.     

树脂基防隔热复合材料高温响应分析方法研究进展

针对树脂基防隔热复合材料高温条件下复杂的热/力/化学的多场耦合问题，从高温性能预报模型、高温响应求解方法和高温试验测试三方面进行了论述。详细介绍了研究树脂基防隔热复合材料高温响应相关的热解动力学模型、材料高温热物性及力学性能演化表征方法、材料高温响应模型的求解方法以及表征材料高温响应的多种高温试验测试手段。对上述研究方法的发展进行了评述，并对未来发展趋势进行了展望。本文有助于相关研究人员认识和发展树脂基复合材料在高温下的热力响应分析方法，也可供工程技术人员对这类材料的防隔热性能和高温承载性能进行研究。     

低密度高亚声速引射风洞设计及性能研究

研究以火星表面大气条件和火星飞行器飞行速度为基础，设计一个低密度高亚声速引射风洞，并运用ANSYS FLUENT 15.0对多喷嘴引射风洞的性能进行了数值计算分析。首先对计算进行了网格无关性验证，在保证计算精度和减少时间与计算资源的基础上，通过研究发现：多喷嘴引射器作为风洞动力系统可满足试验段马赫数达到0.77的高亚声速马赫数要求，并且对试验段上下壁面采用各1°的扩张角可有效降低试验段边界层对压力的影响，从而使试验段静压基本维持不变；提高引射膨胀比是提高试验段雷诺数的一个有效措施，但是会降低引射系数，同时会增加试验段的静压梯度，影响试验段的气流品质。因此低密度引射风洞设计过程中必须综合考虑试验段扩张角，引射膨胀比等因素。