摘要：blades are one of the important components on aircraft *** they break due to vibration failure,the normal operation of the entire engine will be ***,it is necessary to measure their natural frequency before installing them on the engine to avoid *** present,most blade vibration testing systems require manual operation by operators,which has high requirements for operators and the testing process is also very ***,the testing efficiency is low and cannot meet the needs of efficient *** solve the current problems of low testing efficiency and high operational requirements,a high-precision and high-efficiency automatic test system is *** testing accuracy of this system can reach ±1%,and the testing efficiency is improved by 37% compared to manual ***,the influence of compression force and vibration exciter position on natural frequency test is analyzed by amplitude-frequency curve,so as to calibrate servo cylinder and fourdimensional motion ***,the sine wave signal is used as the excitation to sweep the blade linearly,and the natural frequency is determined by the amplitude peak in the frequency ***,the accuracy experiment and efficiency experiment are carried out on the developed test system,whose results verify its high efficiency and high precision.

摘要：The design of a stall-regulated wind turbine to achieve a maximum annual energy output is still a formidable task for engineers. The design could be carried out using an average wind speed together with a standard statistical distribution such as a Weibull with k = 2.0. In this study a more elaborated design will be attempted by also considering the statistical bias as a design criterion. The wind data used in this study were collected from three areas of the Lamtakong weather station in Nakhonratchasima Provice, the Khaokoh weather station in Phetchaboon and the Sirindhorn dam weather station in Ubonratchathani, Thailand. The objective is to design a best aerodynamic configurations for the blade (chord, twist and pitch) using the same airfoil as that of NREL Phase VI wind turbine. Such design is carried out at a design wind speed point. Wind turbine blades were optimized for both maximum annual energy production and minimum cost of energy using a method that take into account aerodynamic and structural considerations. The work will be carried out by the program “SuWiTStat” which was developed by the authors and based on BEM Theory (blade Element Momentum). Another side issue is the credibility of the Weibull statistic in representing the real wind measurement. This study uses a regression analysis to determine this issue.

摘要：日前,IBM在刀片计算存储性能方面取得了重大突破,使中小企业客户和大企业的分支机构能够将多个存储设备整合到一台刀片计算系统中。基于IBM的领先设计,该刀片解决方案可在办公室中使用,客户能在同一系统中的所有刀片服务器上无缝共享信息,不仅提高了刀片系统的利用率和可靠性,并且有效降低了成本。

摘要：为提高潮流能利用效率,基于叶素-动量理论(BEM),给出了Wilson模型在水平轴潮流能水轮机设计上的应用。采用CFD技术计算对设计的水轮机进行水动力特性分析,计算其在不同叶尖速比下的功率特性。在此基础上,对叶片沿展长方向的功率分布和三维绕流特性进行分析,并采用二维计算方法预测对应三维工况下各截面处的流场特性。计算结果表明,水轮机的工作特性满足对功率和效率的要求,说明了设计方法的可靠性;同时绕流特性分析也显示了二维模拟的局限性,尤其在叶根、叶尖部位失真较大,这说明三维效应对水轮机输出功率和流场性能有着显著的影响。

摘要：KEF近期推出新blade旗舰扬声器系统，KEF blade采用共点声源技术设计，新研发的4个两对9英寸低音驱动单元，以背靠背的安装方式实现出色的低频响应。新一代Uni-Q同轴共点单元确保传送清晰透亮、流畅自然的音质。低音和中高音音频由同一声源位置输出，均匀有致，源源不断地放送全频真实音效，KEF blade实现了扬声器声音的全方位时序一致性。

摘要：The structure of multiphase flow helico-axial pump＇s rotor and how to model the rotor, especially the blades of the rotor, based on the Solidworks software. More important, the principle of the blade design is mainly introduced. Under the guide of the principle, the 3D coordinates of the blade data points can be got by matlab programming. In the paper, the design step and the modeling step are particularly described through a concrete example.

摘要：在股骨粗隆间骨折的内固定治疗中，获得头颈部骨块的稳定性有着非常重要的作用。目前临床上打入股骨头内并固定头颈骨块的内置物，以单枚粗大的内固定物使用较广泛，主要为传统的拉力螺钉（lag screw）和新近的螺旋刀片（helical blade）两种。两种内固定物的结构与设计各具特色，是临床应用的基础。本文从两者的发展、结构特点、操作步骤、力学分析等方面进行比较，围绕两种内植物的结构特点和生物力学的研究进展进行了综述，以期为临床研究和应用提供基础。

摘要：论述了民用运输机吊挂设计强度要求,并重点阐述了以下几个方面:吊挂初步设计载荷、FBO载荷计算要求、发动机非包容性转子损坏下的适航符合性思路及离散源损伤容限剩余强度评估要求。在这几部分的阐述中,有具体的设计数据及案例,对设计工作有很好的指导作用。

摘要：为降低叶顶泄漏损失,本文首次将NACA翼型引入向心涡轮,并采用正交试验设计和计算流体动力学(CFD)方法获得了具有最优NACA叶顶型线的向心涡轮叶片,并揭示了该叶片对叶顶泄漏损失的控制机理。结果表明,最优NACA叶顶型线具有较大的前缘内接圆半径、较小的尾缘厚度,以及更靠近前缘的最大厚度位置。其内接圆半径和最大厚度位置对向心涡轮等熵效率的影响度也随叶顶间隙增加而增大。当叶顶间隙为8%出口叶高时,最优NACA叶顶型线可使向心涡轮等熵效率提高1.47%,并使向心涡轮能够在非设计工况下具有较高效率。该型线能够降低尾缘附近的叶顶泄漏速度,减弱泄漏流与主流掺混强度,使流动损失降低。

摘要：京瓷手机让人觉得日本味并不是那么浓厚,形式以及功能上的设计已经超出了他们的思维惯例。就在CTIA大展进行得如火如荼的时候,京瓷带来了CDMA大餐。SE47作为他们的高端型号,拥有64K屏幕的支持能力成了这个机器的最大特色,对BREW、EMS\WAP2.0的支持也如同这个机器的外形一样令人印象深刻。3245强调运动应用,因此外形坚固是这个机器的最大特色,在功能方面也并没有缩水。Phantom/blade/Rave是同一个系列的三款各具个性之作,具有可更换外壳,屏幕也可以从单色到彩色任由自己选择,如果你愿意还能够选择可下载的和弦铃声。S14与5135类似,支持1XRTT数据传输模式,拥有蚌壳式结构。京瓷:CTIA2003大展发布数款新机