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高精度机载SAR波束机相复合稳定技术应用研究
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作者 袁汉钦 胡松涛 《现代信息科技》 2020年第20期78-80,84,共4页
机载平台多方向运动误差是影响机载SAR/MTI雷达目标探测精度的重要因素之一,在伺服转台实现方位向360度大视角情况下,仅依靠伺服转台机械机构难以实现天线波束多维稳定。为满足机载SAR/MTI雷达波束稳定和目标高精度探测需要,研究提出高... 机载平台多方向运动误差是影响机载SAR/MTI雷达目标探测精度的重要因素之一,在伺服转台实现方位向360度大视角情况下,仅依靠伺服转台机械机构难以实现天线波束多维稳定。为满足机载SAR/MTI雷达波束稳定和目标高精度探测需要,研究提出高精度机载SAR波束机相复合稳定技术,解决了机相复合控制、精度和实时性等技术难点,经过试验实测,雷达波束机相复合稳定精度达到0.15度,验证了方法有效性。 展开更多
关键词 高精度 机相复合 SAR/MTI雷达
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Analysis of the Mechanical Properties of the Sintered Composite FeCuC in Two Different Atmospheres
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作者 Clayton Andre de Oliveira Motta Jose de Souza +5 位作者 Marcelo Salvador Coser Alex Fabiano Bueno Lirio Schaeffer Bernardo Poras Reis Hamudy Munir Abou Arabi Lucas Soares de Almeida 《Journal of Mechanics Engineering and Automation》 2015年第1期33-38,共6页
This study aimed to analyze the mechanical properties of the compound FeCuC when compacted at varying pressures and sintered in two different types of furnaces. Besides the different models of furnace, the working atm... This study aimed to analyze the mechanical properties of the compound FeCuC when compacted at varying pressures and sintered in two different types of furnaces. Besides the different models of furnace, the working atmospheres were varied: one is being composed with argon gas and another constituted with a balancing nitrogen and hydrogen. Atmospheres vary with the amount of production and the type of equipment used. The compound generated is used in the manufacture of rings for mechanical seals and is currently manufactured by the sintering process in passing furnace. The sintering was performed in a static furnace with argon atmosphere and compared with the same compound sintered in passage furnace with hydrogen and nitrogen atmosphere. The analysis of the properties of the tested material was performed with the aid of metallography using a scanning electron microscope, which verified the particle size distribution, chemical elements and pores present. Brinell hardness and Vickers micro hardness tests were also used to analyze the properties of this material after completion of the two processes. Thus, the research carried out has shown that variations may occur in the mechanical properties when processed in different furnace types and different sintering atmospheres. 展开更多
关键词 Sintering furnaces FeCuC work atmosphere
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