机载火控系统精度分析

火控系统动态精度试验是指在目标和飞机处于相对运动的状态下,检查系统输出值相对标准值的误差。本文介绍了飞机火控系统动态试验的程序和基于时间序列建模的理论。最后,对导弹与目标相对位置的误差以及火控跟踪雷达对目标的测距、测角误差进行了分析。     

鲁南机床:在国产高端装备发展之路上越走越好

经过后金融危机环境下市场经济的考验,山东鲁南机床有限公司在发展中调整,在调整中谋发展.该公司董事长徐龙泉说,结构决定机体的科学合理性和适应性,即生命力,结构决定成败,结构优则事半功倍.延续十一五发展思路,十二五期间,鲁南机床将努力实现由生产制造型企业向服务制造型企业转型.通过优化产品结构,进一步提高产品结构质量,提升产品档次,推进高档产品的产业化发展,为精准制造和企业整体素质的全面提升夯实基础.     

CFD Study of NO_x Emissions in a Model Commercial Aircraft Engine Combustor

Air worthiness requirements of the aircraft engine emission bring new challenges to the combustor research and design. With the motivation to design high performance and clean combustor, computational fluid dynamics (CFD) is utilized as the powerful design approach. In this paper, Reynolds averaged Navier-Stokes (RANS) equations of reactive two-phase flow in an experimental low emission combustor is performed. The numerical approach uses an implicit compressible gas solver together with a Lagrangian liquid-phase tracking method and the extended coherent flamelet model for turbulence-combustion interaction. The NOx formation is modeled by the concept of post-processing, which resolves the NOx transport equation with the assumption of frozen temperature distribution. Both turbulence-combustion interaction model and NOx formation model are firstly evaluated by the comparison of experimental data published in open literature of a lean direct injection (LDI) combustor. The test rig studied in this paper is called low emission stirred swirl (LESS) combustor, which is a two-stage model combustor, fueled with liquid kerosene (RP-3) and designed by Beihang University (BUAA). The main stage of LESS combustor employs the principle of lean prevaporized and premixed (LPP) concept to reduce pollutant, and the pilot stage depends on a diffusion flame for flame stabili-zation. Detailed numerical results including species distribution, turbulence performance and burning performance are qualita-tively and quantitatively evaluated. Numerical prediction of NOx emission shows a good agreement with test data at both idle condition and full power condition of LESS combustor. Preliminary results of the flame structure are shown in this paper. The flame stabilization mechanism and NOx reduction effort are also discussed with in-depth analysis.     

精诚MES系统在航空航天离散制造业中的应用

MES是对ERP车间现场执行层计划的有力补充和管理延续。从生产制造管理而言,ERP解决了从销售、物料需求到采购等一系列业务流程的管理,而MES则是从物料需求计划开始往下延伸,考虑车间具体情况,制订计划和监控现场执行,强调现场的精细化管理和实时监控,以及依据反馈的实际数据进行各种生产和质量上的统计分析。     

蓝新特LXT-J夹具元件系统

北京蓝新特柔性装备技术有限公司,是一家专业从事现代机床夹具设计、生产的高新技术企业。公司目前的主要产品LXT-J夹具元件系统是公司独立研发并拥有自主知识产权的高技术产品,是对传统工艺装备的一种创新。目前已广泛应用于航空、航天、军工、船舶、汽车、电子、纺织等领域的大型企业与科研院校。     

Newall球栅传感器

球栅传感器是英国Newall公司发明的世界专利产品. 其主要特点是: (1)球栅尺和读数头全密封,防水、防油、防尘、防铁屑、耐振动,高可靠.     

为多处理器计算机重新设计Lantek Expert(专家)系统

Lantek修改了Lantek ExpertⅡ和Lantek ExpertⅢ的结构系统。软件已经优化,能充分发挥装备双核式四核处理器的计算机的能力,处理速度增加了30%～40%。     

Renishaw与超级巨无霸空客A380一起展翅高飞

无论从哪个方面衡量,在欧洲完成最终组装的最新超级巨无霸空客A380都是世界上最大的商用飞机.它的翼展宽达260英尺(79m),能够搭载555名乘客.建造这个双层巨无霸需要采用一些高度创新的装配技术,用于精确定位的RenishawRG4直线光栅系统就是其中之一.     

北京第二机床厂数控磨床亮相CIMT2009

北京第二机床厂有限公司是中国机床工具工业协会常务理事单位,公司通过IS09001:2000质量管理体系认证,拥有"北二"品牌的名牌系列产品.公司主要经营业务包括:研制、生产和销售数控磨床、高精度外圆磨床、普通精度外圆磨床、专用磨床、凸轮轴磨床、超精加工机床、立卧式加工中心、成套设备、机床配件和功能部件,并提供机床维修、维护,机械加工等专业服务.产品广泛应用于航空、航天、军工、汽车、电子、轴承、冶金、机床工具和工程机械等行业.