Study on the design of control valve for U-shaped noise reduction cage and its fluid flow features and noise

In response to technical issues such as the ineffective noise reduction impact of balanced cage and single-seat control valves, the U-shaped noise reduction cage control valve is investigated and developed. In addition, its equal percentage flow properties and noise reduction impact are good, allowing it to effectively minimize the noise created by the change of fluid parameters of medium such as vapor, gas, and gas-liquid two-phase flow. The flow coefficient and flow properties were analyzed. The noise features of the medium air flow at small and large openings of 30% and 85% are simulated and analyzed, respectively. The pressure, velocity, and temperature of the inlet and outlet air, as well as the sound intensity maximum and sound power level maximum, are also analyzed with the opening curves. A small opening of 30% was selected, and the noise characteristics of cavitation generated by the medium water flow were simulated and analyzed. Together with the pressure and temperature change curves of the incoming water, the volume maxima and density minima of water are studied. The maximum sound intensity and sound power level of water are analyzed using the pressure and temperature curves of inlet water, as well as the cavitation coefficient and the degree of opening. The results of the trial for the pressure resistance of the valve body and the trial for the valve seat seal indicate that both the valve body strength and the valve seat seal meet the specifications. Comparing the noise trial results and simulation results reveals that the sound intensity and sound power level assessed by the trial and simulation are comparable, and the noise reduction impact of the control valve is positive.     

建筑屋面板综述

针对国内建筑屋面板生产现状,并结合有关研究成果,对建筑屋面板进行了分类,并对其性能、现状进行了综合阐述。     

浅析城市新区规划中引入整体城市设计的目的及意义

以贵阳市金阳新区为例,分析了城市新区规划中引入整体城市设计的目的,说明了新区规划中引入整体城市设计的意义。     

自由式单孔多锚头防腐型预应力锚索的施工质量控制

锦屏一级水电站存在复杂的不良地质现象,设计采用了大量的自由式单孔多锚头预应力锚索,对各级边坡进行加强支护处理。针对锚索施工专业性强、施工工艺复杂、质量控制节点多的特点,从此类型锚索的施工工艺入手,全面介绍了各施工环节的质量控制要点。     

居住区道路铺装设计研究

介绍了居住区道路规划设计应遵循的基本原则,在分析居住区道路的特点及功能的基础上,结合道路铺装的实际情况,探讨了居住区道路铺装的功能特性、设计要素,以期为居民创造宜人的生活环境。     

对城乡一体化居住社区规划设计的思考

结合城乡一体化居住社区的历史背景,对杭州市一体化社区实验区——萧山明怡花苑的设计特点进行了归纳总结,并阐述了设计者在设计该社区过程中的启示和心得,以期指导实践,提高我国城乡一体化社区规划设计水平。     

粉煤灰的物理力学特性试验研究

结合某电厂贮灰场利用粉煤灰建造子坝工程的需要,对粉煤灰的基本物理力学特性进行了试验,得出了粉煤灰的基本物理力学参数指标,从而对粉煤灰的工程应用具有一定的指导意义。     

浅谈水蓄冷技术

结合我国电力能源现状及相关政策,对水蓄冷技术进行了介绍,分别阐述了水蓄冷技术的主要设备,技术特点及优点,并对水蓄冷技术在空调系统中的应用及优势作了具体说明,以期促进空调节能技术的推广应用。     

大跨斜拉桥动力特性有限元建模与分析

以某大跨斜拉桥为例,建立了一个比较完整的斜拉桥动力特性有限元模型,通过计算得到了该桥的动力特性,采用单单元和多单元模型模拟斜拉索,分析了拉索本身振动对斜拉桥的整体动力特性的影响。     

基于大数据集成算法的多终端接入模式自动化识别模型

为提高移动终端设备多终端服务器接入精度与效率,更好地完成应用服务的人机交互,提出了基于大数据集成算法的多终端接入模式自动化识别模型。利用物联网环境采集多终端数据结构信息特征,组建传感器节点空间收敛目标函数,通过最小方差评估定位优化采集节点,收集完整接入数据;计算初步冲突特征信息,运用去一划分方法推算冲突特征数据离群性权...