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排序方式: 共有103条查询结果,搜索用时 31 毫秒
31.
国外巡航导弹用材料及工艺 总被引:6,自引:3,他引:6
简要介绍了巡航导弹的结构和技术数据,美国战斧巡航导弹用材料及工艺,以及目前巡航导弹所用材料及工艺的改进。 相似文献
32.
李长江 《西安航空技术高等专科学校学报》2006,24(3):36-38
通过对某城市会议中心用水系统的实际考察,找出了存在的问题,提出了采用“射频式水处理器”对用水系统进行水处理的改造方案,达到既防止系统结垢,又能减少管网腐蚀,达到维持系统安全稳定运行的目的。 相似文献
33.
《中国航空学报》2020,33(12):3469-3478
The utilization of fiber reinforced thermoplastics (FRTP) is expected to fulfill lightweight demand in mass-produced aerospace products. Facing the unavoidable assembly of FRTP parts, fusion bonding methods such as resistance welding are promising compared with mechanical joint and adhesive bonding. In this paper, a procedure has been brought out to understand the relationship between processing conditions and performance of the FRTP welding joints. The adherends were continuous glass fiber reinforced polypropylene (GF/PP) laminates fabricated by hot-pressing method. The influences of time, current and pressure on the bending strength of the resistance welding joints were investigated. A processing window was drawn based on the optical observation of welded surfaces. The quantitative relationship between process parameters and mechanical property of GF/PP welding joint was established by Response Surface Method (RSM) with high accuracy. It was found that bending strength of GF/PP welding joint was improved by 31% compared with hot-pressing benchmark. 相似文献
34.
P.N.A.M. Visser J. van den IJssel T. Van Helleputte H. Bock A. Jäggi G. Beutler D. Švehla U. Hugentobler M. Heinze 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2009
Precise Orbit Determination (POD) for the Gravity field and steady-state Ocean Circulation Explorer (GOCE), the first core explorer mission by the European Space Agency (ESA), forms an integrated part of the so-called High-Level Processing Facility (HPF). Two POD chains have been set up referred to as quick-look Rapid and Precise Science Orbit determination or RSO and PSO, respectively. These chains make use of different software systems and have latencies of 1 day and 2 weeks, respectively, after tracking data availability. The RSO and PSO solutions have to meet a 3-dimensional (3D) position precision requirement of 50 cm and a few cm, respectively. The tracking data will be collected by the new Lagrange GPS receiver and the predicted characteristics of this receiver have been taken into account during the implementation phase of the two chains. 相似文献
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36.
《中国航空学报》2021,34(5):163-182
Hot compressive experiments of the laser solid formed (LSFed) TC4 titanium alloy were conducted at a wide temperature range of 650–950 °C and strain rate of 0.01–10 s−1. The Arrhenius-type constitutive models of the LSFed TC4 alloy were established at the temperature range of 800–950 °C and of 650–800 °C, respectively. The average relative error between the predicted stresses and experimental values in those two temperature ranges are 10.4% and 8.3%, respectively, indicating that the prediction models constructed in this paper are in a good agreement with experimental data. Processing maps were established by the principle of dynamic materials modeling on the basis of the data achieved from the hot compression experiments. The processing parameters corresponding to the stable and unstable regions of material deformation can be determined from the processing maps. The microstructure evolution of the stable and unstable regions of the samples after tests were observed. Finally, the effect of hot compressive parameters on the microstructure were investigated to research the dynamic recrystallization and the texture of the deformed LSFed TC4 alloy. 相似文献
37.
三维磁流体力学(MHD)数值模拟是用来研究日冕和太阳风最常用的方法之一, 其中将计算得到的日冕电子数密度转化为日冕偏振亮度(Polarization Brightness, PB)是与观测对比的重要方法. 由于待转换电子数据网格密度、PB数据网格密度和计算模型的复杂度, 使得日冕偏振亮度的计算比较耗时, 利用单CPU计算无法达到近实时转换日冕偏振亮度的要求, 从而影响了数值模拟的验证效率. 本文在CPU/GPU环境下, 利用CUDA编程技术, 提出了一个日冕偏振亮度并行计算模型. 实验结果表明, 该模型比CPU上的串行模型计算速度提高了31.86倍, 达到了近实时模拟与观测数据比对的计算要求. 相似文献
38.
李洪义 《中国空间科学技术》1987,7(5):58
本文通过典型冲件介绍了锌基合金的成分、机械性能、锌基合金冲模工艺过程,技术经济效益以及提高锌基合金冲模的浇铸质量的几点措施。 相似文献
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40.
多传感器信息融合技术综述 总被引:16,自引:0,他引:16
信息融合是信息领域一个前景广阔的研究方向。通过多传感器组网可以获得比单一传感器质量更高的信息。从信息融合的定义诠释了信息融合的内涵,指出信息融合的实质是推理与决策。给出集中式、分布式和混合式三种模型结构,比较它们的优缺点。融合层次对多传感器信息融合性能有重要影响,给出三种融合层次的性能对比结果。分析四种流行的融合处理算法,比较它们的性能。最后从技术发展和应用需求出发,对信息融合的发展作进一步展望。 相似文献