An alternative mathematical model of vane anemometers based on the balance of power

Anemometers based on the exchange of momentum between the flow and rotating measuring element comprise an important class of instruments used in flow metrology, especially in meteorological and ventilation measurements. In these instruments, overvaluation of the measured average velocity, caused by the inertia of their rotors, takes place. To analyse this phenomenon and the dynamics of the measurement process, as well as to estimate and minimize the measurement uncertainty, it is required to be acquainted with the mathematical model of the anemometer. In this study, the model of the vane anemometer based on the equation of motion of its rotor available in the literature is analysed, and a new model based on the power balance is proposed. Model testing and a comparison of both models has also been performed.     

双作用叶片式二次元件的研究

介绍了双作用叶片式二次元件的结构和工作原理，分析了其变量机理和节能特点，并对二次元件的性能特性进行了研究。     

双作用叶片泵的主振动试验

通过对双作用叶片泵振动信号的时域跟踪和频谱分析，探索泵内部零件状况与主振动的关系，使有选择地避开某些频率的振动成为可能。     

起动阶段涡轮导向叶片热应力及冷却作用研究

建立了涡轮导向叶片有限元分析模型,参照相关的试验数据和文献资料确定热边界条件,计算了发动机起动阶段涡轮导向叶片各瞬时的温度及热应力。分析所得高温、高应力区域与相似条件下某型发动机地面试车过程中出现裂纹的区域基本一致,验证了数值模拟过程的正确性。在此基础上,对比分析施加对流冷却与无冷却措施两种条件下的计算结果,发现对流冷却使叶片各点温度下降而应力升高,推断出温度与应力的变化趋势反向,因而在叶片冷却系统的设计中需要权衡温度与应力的关系。其结果与结论对叶片瞬态热应力计算和热疲劳分析有一定的借鉴意义。     

导轮叶片反向设计

本文先用反向设计的方法对变距器导轮的叶片形面进行取点重构，然后再利用正向设计的方法进行导轮的三维造型。讨论了应用快速原型技术（Rapid Prototyping,RP)制造导轮快速模具（Rapid Tooling,RT)的方法。     

Study of the laboratory Vane test on mortars

The Vane method (Vane test) is a simple but efficient method to measure the yield stress among other properties of non-Newtonian fluids. These fluids exhibit big flow effects in flat surfaces which are common in rheometers devices of different types (parallel disk or coaxial cylinder types). The yield stress values obtained with Vane method, in pastes, gels, soils and concentrated suspensions, have presented good agreement with results found elsewhere by most of the rheologic methods shown in the literature. The aim of this work is presenting a discussion on the capabilities of the Vane method, highlighting the theoretical basis, the functioning principle with some operational particularities, and some applications of the method in investigating the properties of fresh rendering mortars.     

Experimental investigation on the turbulence augmentation of a gun-type gas burner by slits and swirl vanes

The purpose of this paper is to investigate the effects of slits and swirl vanes on the turbulence augmentation in the flow fields of a gun-type gas burner using an X-type hot-wire probe. The gun-type gas burner adopted in this study is composed of eight slits and swirl vanes located on the surface of an inclined baffle plate. Experiment was carried out at a flow rate of 450 //min in burner model installed in the test section of subsonic wind tunnel. Swirl vanes play a role diffusing main flow more remarkably toward the radial direction than axial one, but slits show a reverse feature. Consequently, both slits and swirl vanes remarkably increase turbulence intensity in the whole range of a gun-type gas burner with a cone-type baffle plate.     

基于Solidworks的叶片参数化设计系统开发

对利用VB、Micmsoft Access进行基于Solidworks的应用程序二次开发进行了研究，提出了基于Solidworks的叶片参数化设计系统开发的总体框架和实现方法，实现了叶片的参数化建模，缩短了叶片的设计开发周期，提高了设计效率和质量。文中给出了系统的体系结构和部分实现代码。本文提出的方法对开发复杂产品的参数化设计系统具有参考价值。     

并联机床数控系统的研究

在分析并联机床控制特点的基础上，介绍了美国kollmorgen公司的8轴联动运动控制卡，提出以此卡为控制核心、工业控制机为系统支撑单元的主从式7轴联动并联机床数控系统设计方案，并分析了系统硬件结构和软件模块。     

复速级涡轮机叶片强度分析

为检验涡轮机叶片材料及其结构能否适应高温工作环境,分析了叶片根部的应力分布情况,并对复速级涡轮机的二级叶片的强度进行了校核,给出了叶片根部关键点的安全系数,确定了叶根的危险点,探讨了叶片中径对叶片根部的应力的影响规律。