高性能动中通天线罩设计、制造和应用

"Satellite communication in motion(SCM,动中通)"具有覆盖区域广、不受地形地域限制、传输线路稳定可靠和移动通信的优点,在军民两个领域都具有极为广泛的发展前景。天线罩是保护"动中通"天线的必要设备。本文介绍了高性能动中通天线罩的设计、工艺制造及应用,通过研究高性能天线罩材料的基本性能,对Ku波段天线罩进行铺层设计。利用ANSYS结构分析软件,对Ku波段的高性能动中通天线罩进行了结构优化分析;同时对工艺、电性进行了适合使用的优化设计,并简单介绍了设计制造的天线罩应用前景。     

复合材料闭模成型工艺在天线罩上的应用研究

复合材料闭模成型工艺技术具有成型产品性能优良、质量稳定、生产效率高和环境友善等诸多特点,本文对复合材料天线罩产品采用闭模成型工艺的应用材料、树脂流动、充模过程和适用情况进行了阐述和说明.天线罩产品采用闭模成型工艺,选择满足其性能和工艺双重特性的材料非常重要,通过树脂流动趋势和仿真分析来指导工艺设计,可有效的避免工艺实施...     

Ka频段小型分块式夹层结构天线罩的优化设计

Ka频段雷达天线罩的应用越来越广泛,由于工作频率高、工作频带宽,目前主要采用金属空间桁架式天线罩或整体天线罩。但在船载平台等一些使用空间受限的场所,仍需考虑采用传统的夹层式天线罩的可行性。本文对目前Ka频段天线罩的应用情况进行了介绍,并针对中等规模的分块式夹层结构Ka频段天线罩提出了优化设计方案,在满足天线罩结构力学的基础上,尽可能地提高天线罩的电磁传输性能,以便满足使用要求。     

影响天线罩性能的主要工艺因素

本文主要从工艺方面出发，对地面雷达天线罩在生产过程中所需要控制的指标进行了分析，指出罩壁厚度和均匀性是主要的工艺指标，并分析各项指标是如何对雷达天线罩性能产生影响。     

高超音速导弹天线罩透波材料研究进展

高超音速导弹用天线罩材料须同时具有力学、介电、耐烧蚀及抗冲击等综合性能.本文简述了天线罩材料的发展历程,着重综述了连续纤维增强陶瓷基透波复合材料的研究现状,分析了高超音速导弹天线罩材料的关键技术,包括材料体系和制备工艺选择、材料加工技术,指出了高超音速导弹天线罩材料的发展方向.     

陶瓷天线罩无机涂层的研究进展

通过在天线罩表面制备涂层,可以有效提高天线罩的多方面性能,因此天线罩涂层的研究具有重要的工程价值.本文综述了天线罩无机涂层的制备工艺以及研究进展,指出天线罩涂层研究正朝着提高天线罩基体材料的防潮、抗烧蚀、耐冲刷和耐高温性能以及拓展频带等集多功能于一体的方向发展.     

高温宽频带陶瓷导弹天线罩研究进展

概述了宽频带天线罩透波的基本原理及国内外高温宽频带导弹天线罩的发展状况.重点综述了国外陶瓷夹层材料的制备、性能及电性能设计方面的研究,指出了我国在高温宽频带天线罩研制方面存在的问题,在此基础上对我国高温宽频带透波材料的前景进行了展望.     

天线罩材料研究进展

天线罩材料须同时具有力学、介电和抗雨蚀等综合性能。本文以天线罩的发展过程为线索,简述了从纤维复合材料、陶瓷及陶瓷基复合材料作为天线罩材料的国内外研究现状,指出了天线罩未来的发展方向。     

陶瓷基复合材料天线罩制备工艺进展

天线罩是高超音速寻的制导导弹前端的重要部件,必须具有防热、透波、承载等多种功能。介绍了高超音速导弹天线罩候选材料二氧化硅、氮化硼和氮化硅的基本性能,综述了颗粒增强、纤维增强和叠层结构的陶瓷基复合材料天线罩的制备工艺与力学、介电性能,分析了陶瓷基复合材料天线罩研究存在的问题,指出了发展方向。     

某Ka波段天线罩的设计

设计制作具有尺寸精度高、透波率高的Ka波段天线罩对于保护天线、减少传输损耗具有极其重要的意义。本文介绍了某Ka波段天线罩的研制过程,通过对该天线罩材料的基本性能进行分析研究,得出应用于该天线罩的初步结构。利用ANSYS软件,对设计的Ka波段天线罩进行了结构分析,并简单介绍了研制的工艺流程。按照设计制作的Ka波段天线罩,其性能完全满足用户的技术指标要求。     

大尺寸高性能雷达天线罩的研制

本文主要介绍了大尺寸高性能雷达天线罩选用的材料体系、成型工艺和制造技术。研制的天线罩较好地通过了力学、电学性能测试和无损检测。     

三维中空复合材料天线罩的有限元结构分析

某类型天线罩外形尺寸较大,减重要求高,三维中空复合材料可满足该类型天线罩透波和结构高强的要求。针对上述使用要求和实际工况,选择三维中空织物复合材料为主体结构,玻璃纤维增强环氧树脂复合材料为补强面层,制备三维中空结构天线罩,采用有限元分析软件建立三维中空结构天线罩的有限元模型,对该类型天线罩在使用工况下的刚度、强度和稳定性进行分析,其计算结果满足刚度、强度和稳定性的要求,并通过压力试验验证中空夹层天线罩的变形量与有限元分析结果保持一致,从而指导该天线罩的铺层设计、优化及材料的选用。     

大型地面雷达天线罩的研制

介绍大型地面雷达天线阵列防护罩所用的材料及其制造工艺。首次采用低压共固化工艺成功地制造了大尺寸的Ａ型夹层结构雷达罩。结果表明，所选用的材料和工艺可行，雷达罩的整体性能和尺寸精度均满足性能指标要求。     

High temperature ceramic radomes (HTCR) – A review

An electromagnetically transparent, structurally robust and environmentally resistant enclosure of radar antenna for ground based systems to modern avionics in military aircraft and missiles is called as radome. Radome materials are classified based on: (i) type of function - surface-based or flight-mode and (ii) speed of operation - subsonic, supersonic to hypersonic. The desired properties of these materials are low dielectric constant and low loss factor in addition to its capacity to withstand the high temperature of operation. Composite laminates of glass or aramid fibre reinforced polymeric resins are radome material candidates for applications in subsonic range. However, ceramics are the only viable option for military aerospace applications such as a fighter jet travelling at Mach 3 or an advanced hypersonic missile speeding up to Mach 5. This review outlines the hand-full of ceramic materials already in application as radome materials like high-purity-alumina, pyroceram, slip-cast-fused-silica, their processing technology, electromagnetic and mechanical properties, advantages and disadvantages with respect to advanced military vehicles. Use of silicon nitride based radome materials, that has exceptional mechanical strength and thermal stability up to 1400 °C is illustrated with respect to reaction bonded silicon nitride, hot pressed silicon nitride, silicon oxynitride, sialon and their composites. Design of new generation radome materials was conceptualized and discussed as applicable to silicon nitride and related ceramics, wherein incorporation of varied degree of porosity improves electromagnetic properties, simultaneously, maintaining the required mechanical strength. Multilayer and graded porosity and its influence on electromagnetic properties were briefly discussed. Si₃N₄ ceramics having controlled porosity leading to optimum electromagnetic and mechanical properties produced through systematic processing is proposed as the futuristic high temperature radome material for supersonic applications.     

陶瓷天线罩材料的研究进展

综述了陶瓷天线罩材料的研究概况,分析了天线罩材料设计的基本原则,对增强结构和材料体系等技术问题进行了探讨,最后展望了陶瓷天线罩材料的发展趋势.     

Dielectric and mechanical properties of hypersonic radome materials and metamaterial design: A review

This review paper examines ten current ceramic radome materials under research and development and provides a comprehensive overview of available high temperature and high frequency data from literature. An examination of metamaterials for radio-frequency transparent radomes is given and our preliminary experimental results of a high-temperature metamaterial design are presented. The next-generation hypersonic vehicles’ radome temperatures will exceed 1000℃ and speeds will exceed Mach 5. An ideal radome material will have a high flexural strength, low dielectric constant and loss tangent, and high resistance to thermal shock and corrosion. The microstructural effect on the dielectric and mechanical properties and the effects of environmental factors such as rain are discussed. The impact of metamaterial structure on key radome factors such as boresight error, gain, and polarization is examined. After examining the associated benefits with the use of metamaterials, our preliminary results for a potential high-temperature metamaterial design are presented.     

高性能机载雷达罩VARTM工艺用树脂/纤维浸润性研究

研究了采用真空辅助树脂传递模塑(VARTM)工艺制造高性能机载雷达罩的TDE-85环氧树脂、间苯二甲酸二烯丙酯(DAIP)和E-51环氧树脂三种材料体系的浸润性能。结果表明,三种材料体系中,DAIP体系具有较好的浸润性能,粘度较低,最适合采用VARTM工艺制备雷达罩。     

Applying Spray Drying to Customized Powder Manufacture

Spray drying is an important continuous industrial process for drying pumpable liquid formulations irrespective of their heat sensitivity, rheology, solids content and processing rate. Furthermore spray drying has the capability through drying chamber design, plant layout and mode of operation to produce dried products of specific particulate size and morphology. These are important aspects when spray drying technology is applied to the needs of customized powder manufacture. There are many examples in industry where spray dried powders have to meet stringent specifications set by such factors as end-product powder quality standards dictated by global competition, dry raw material characteristics required for optimum downstream processing, and dry materials handling to comply with environmental, health and safety issues. Spray drying is no longer regarded just as a convective industrial drying concept, but also as an integral part of modern manufacturing practices applying powder technology. This paper r     

聚苯硫醚在天线罩上的应用研究

采用注射成型的方法制备出某弹载聚苯硫醚(PPS)天线罩。介绍了弹载天线罩对材料性能的要求、PPS的特性,以及PPS天线罩的注射成型过程、后处理过程,并比较了PPS天线罩与聚四氟乙烯(PTFE)天线罩的性能。结果表明,PPS天线罩的可制造性、尺寸稳定性等综合性能优于PTFE天线罩。     

用喷雾干燥方法制造具有指定特性的颗粒

Spray drying is an important continuous industrial process for drying pumpable liquid formulations irrespective of their heat sensitivity, rheology, solids content and processing rate. Furthermore spray drying has the capability through drying chamber design, plant layout and mode of operation to produce dried products of specific particulate size and morphology. These are important aspects when spray drying technology is applied to the needs of customized powder manufacture. There are many examples in industry where spray dried powders have to meet stringent specifications set by such factors as end-product powder quality standards dictated by global competition,dry raw material characteristics required for optimum downstream processing, and dry materials handling to comply with environmental, health and safety issues. Spray drying is no longer regarded just as a convective industrial drying concept, but also as an integral part of modern manufacturing practices applying powder technology. This paper reviews the aspects of spray dryer design and operation for consideration when customized powder manufacture is involved.