摘要：Well-designed airfoil is very important for high-performance *** paper developed an efficient multi-objective and multi-constraint optimization design system for rotor airfoils based on RANS analysis,and verified the performance of the optimized *** CRA09-A as the baseline rotor airfoil,the CRA09-B optimized rotor airfoil was designed *** with the foundation of high-precision rotor airfoil stationary test technology,the CRA09-B and CRA09-A rotor airfoils were tested in the S3 MA high-speed wind tunnel of *** order to correct the aerodynamic data,a single parameter linear wall pressure method is used to consider the tunnel *** results indicate that multi-objective and multi-constraint optimization design method developed in this study is reliable,and that CRA09-B optimized airfoil provides better stationary performance than CRA09-A airfoil in terms of maximum lift coefficient and lift-to-drag ratio.

摘要：Based on FEM theory,a method of dynamic analysis for hingeless rotors considering anisotropic composite materials is established.A parametric modeling method of composite blade with typical profile and high simulation degree for design is *** the finite element method,the profile characteristics of rotor blade can be obtained efficiently and accurately,and the synchronization of parametric design and finite element analysis of structural characteristics can be *** a 23-degrees of freedom non-linear beam element is used to simulate the extended one-dimensional beam,thereby a nonlinear differential equation describing the elastic motion of the rotor is *** obtain the crosssectional target characteristics of the blades,an inverse design method is proposed for cross-section components based on combinatorial optimization *** calculation and validation work show that the proposed model can effectively analyze the aeroelastic characteristics of general composite ***,the influence of cross-sectional parameters on the aeroelastic stability and hub loads of hingeless rotor is analyzed and some remarkable conclusions are obtained.

摘要：The precise calculation of temperature and thermal stress field of steam turbine rotor under off-design conditions is of paramount significance for safe and economic operation, in which an accurate calculation of heat transfer （HT） coefficient plays a decisive role. HT coefficient changes dramatically along with working conditions. First, a finite element analysis of rotor model, applied with ordinary rotor materials, has been conducted to investigate the temperature and thermal stress difference along with the change of HT coefficient from 20 W/（m2. ~C） to 20000 W/（m2. ~C）. Next, the differentia- tion between existing empirical formulas has been analyzed from the aspect of physical significance of non- dimension parameters. Finally, a verifying case of the cold startup of a 1000MW unit has been proceeded. The result shows that the accuracy of coefficient calculation when steam parameters are low has a greater influence on that of rotor temperature and thermal stress, which means a precise empirical HT coefficient formula, like the Sarkar formula is strongly recommended. When steam parameters are high and HT coefficient is larger than 104 W/（m2.℃）, there will be barely any influence on the calculation of thermal stress. This research plays a constructive role in the calculation and analysis of thermal stress.

摘要：The goal of the modern farming systems is to economize energy consumption and to reduce farming *** selection and use of agricultural machines are important factors to achieve this *** tillers are tillage tools that are used for accomplishment of both the primary and secondary tillage *** the widespread application of rotary tillers and wide use of modern tractors in Iran,optimal design of these machines is *** in this study,the optimal working width and optimal diameter of the rotary tiller's rotor proportionate with the power of the MF 399 tractor was delineated based on the energy *** theoretical method is based on the specific works of tractor and rotary *** showed that the optimal working width and optimal diameter of the rotary tiller’s rotor with maximum of forward speed 1 m/s for tractor was 240 cm and 6.27 cm,respectively.

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：Ocean waves can directly drive WECs （wave energy converters） to perform two types of motion--reciprocating motion and unidirectional rotary motion. In general, the efficiency of a reciprocating WEC is strongly wave-frequency dependent, whereas the efficiency of a rotary WEC can be somewhat wave-frequency independent. To date, a huge majority of WEC technologies under development in industry belong to the reciprocating class, and only a few WEC concepts fall in the unidirectional rotary class. In the present work, a wave-driven rotor for unidirectional rotary motion was proposed and characterized. A numerical tool has been developed for characterization of the rotor＇s unidirectional rotary tendency. The tool included a wave model and a drag force model. Simple circular tubes were used as blades in a basic rotor design. This basic design demonstrated strong potential for unidirectional rotary motion at a proper rotor submersion level and under various wave conditions. Two improved designs were yielded from the basic design. In one improved design, the original circular tubes were replaced with cylindrical shells of semicircular cross section as new blades. In another design, the semicircular shells were further modified to become one-way foldable. The two improvements significantly enhanced the rotors＇ unidirectional rotary tendency in waves, which has been verified by numerical simulation. Broad ranges of wave parameters and the submersion level have been numerically explored on the two improved rotor designs in conjunction with dimensional analysis.

摘要：The star-polygon brushless doubly-fed machine (SPBDFM) is a new type of wound-rotor machine and is attractive for variable-speed constant-frequency shaft generation system. The structure of rotor for the machine may be improving the conductor availability of the rotor windings. The kirchhoff laws is employed to illuminate the principle and some combinations of different slots and poles are presented as the examples. Harmonic analysis is also employed to analyze the magnetic motive force (MMF) waveform of rotor winding with the structure of star- polygon. Finally, the results are used to reveal that the SPBDFM is attractive for shaft generation system.

摘要：为了提高高速泵的可靠性,利用专业的转子动力学特性分析软件SAMCEF rotor对高速矿用抢险泵转子系统进行分析,研究转子的动力特性--临界转速及其振型,根据径向轴承参数建模,分别采用一维梁模型,二维傅里叶模型和三维实体模型进行计算比对,得到了各自的坎贝尔图和临界转速及振型。研究表明,三种模型吻合的状态基本一致,设计方案避免了工作转速达到临界转速产生共振现象。根据转子动力学分析软件SAMCEF rotor分析研究,临界转速的计算方法比较完善,分析结果较为精确,且一维及二维模型求解法对计算机配置要求低,求解耗时短。

摘要：作为专业的卡簧卡箍生产企业,rotor Clip始终把创新放在第一位,不断改善产品技术和制造工艺,开发新产品来丰富产品线以满足日益增长的客户需求。另一方面,rotor Clip也向顾客提供专业的汽车及零部件设计信息,保障客户作出明智选择。总部位于美国新泽西州的rotor Clip创建于1957年,是一家专业生产高品质卡簧、卡箍、波形弹簧的家族企业。走过将近60年的发展历史,rotor

摘要：在对各种交错网格离散格式的奇偶不耦合数值误差进行了详细的傅里叶分析和比较后 ,采用一种紧致的交错网格有限体积法将纳维 -斯托克斯方程和k ε湍流模型方程紧密的耦合在一起求解 ,发展了一套三维定常流程序 .通过对NASArotor 67设计和非设计工况内部流场的数值模拟结果与实验的比较、分析 ,初步验证了程序的准确性和可靠性 .