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《Planning》2018,(1)
本文介绍了一种基于双Pt的特种风速传感器的研究,传感器以超低能耗MSP430单片机为主控处理器,完成对风速信息进行实时不间断的观测和显示,显示范围0-20m/s。利用4个LED显示管显示出观察的风速值,精确度达到0.1m/s。而且对风速超过标准值时能够进行闪光和声音报警,并能够将风速观察信号通过短距离无线发送到上位终端。这种传感器设计具有结构简单、静态特性好、观察精度高的优势,为今后其他功能的风速传感器提供理论指导。 相似文献
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本文对被动式太阳房集热墙风口平均风速的测定进行了研究。通过实验室模拟风口实验,测量分析风口截面上不同风量下风口的平均风速,找出测点风速等于平均风速的分布区域,将一个风速传感器探头放在该区域测出的风速即可代表风口的平均风速。将实验结果在青藏铁路线上被动式太阳房现场进行了校核,从而实现了对被动式太阳房集热墙风口平均风速的自动监测。 相似文献
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《四川建筑科学研究》2016,(5)
为了避免导线舞动对输电线路运行安全带来危害,并了解导线在舞动过程中关键部位受风压大小,根据风速、风压关系以及可能存在的风速范围,对可固定在导线上方便装卸的风压测量装置进行了设计。利用贴在装置上的PVDF传感器进行数据采集,实验数据在频域中存在频率突变,突变值与不同风速下在导线背风区域里产生的涡流频率有关,同时发现实验计算风速与真实风速间存在比例关系。 相似文献
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针对智能建筑室内环境控制系统对室外环境参数的检测要求,开发了一种集照度检测、风速检测和雨量检测功能于一体的集成式气候传感器.并构建基于CAN总线控制器SJA1000,收发器PCA82C250的通信接口.实现集成式气候传感器与上位机的数据传输。 相似文献
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《Planning》2019,(14)
<正>地面自动气象站传感器的维护和保障关系到自动气象站能否正常运转并发挥精准监测作用。本文重点对突泉县地面自动气象站气压传感器、温湿度传感器、雨量传感器和风向风速传感器的维护和保障工作进行总结,并为本地的气象维护工作带来积极的促进作用。自动气象站是指在某一地区根据需要建设的能够自动探测多个要素,无需人工干预,即可自动生成报文,定时向中心站传输探测数据的气象站,它由气象传感器、微电脑 相似文献
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利用超声风速仪和加速度传感器现场实测了中信广场在台风"达维"的作用过程中的风场特性、建筑物表面风压以及加速度响应时程,分析了平均风速、平均风向的变化历程,以及纵向、横向和竖向风速谱特性和加速度响应谱特性。结果表明,中信广场顶部的风速谱与von Karman谱较为接近,通过现场实测的加速度响应谱得到中信广场的固有频率比有限元模型的计算结果大32%,分析认为由于非结构构件参与工作,增加了结构刚度以及结构没有满负荷工作,结构的实际质量小于有限元分析中的计算质量。 相似文献
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《Planning》2015,(23)
介绍一个小型多功能气象监测系统,该气象监测系统通过各类风速、风向、温度、湿度、光照强度传感器、大气压强传感器和粉尘传感器将检测到的数据自动进行汇总分析,并通过无线设备传输到终端平台。该系统采用无线传输,这样在测量气象环境时就不用线缆便可以检测到数据以达到方便快捷的测量。 相似文献
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In order to investigate dynamic characteristic of underfloor air supply terminal unit, an IFV900A hot-wire anemometer was used to measure the corresponding velocity field. Turbulence intensity and power spectrum density exponent of air velocity signal were analyzed. The result showed that the outlet velocity distribution of underfloor air supply terminal unit was uniform. With increment of height, the velocity distribution trends to be uniform. Two velocity attenuation regions appear during airflow development. Turbulence intensity changes obviously with height. It is lower than that of mechanical wind. Turbulence intensity goes up with the increment of jetting distance. Power spectrum density exponent trends to the value of natural wind with increase of jetting distance and decrease of wind velocity. The exponent value approaches to the value of typical natural wind for the air velocity is 0.5 m/s under high supply air rate. With airflow diffusion, the fluctuation characteristic of airflow varies obviously with the jetting direction. The fluctuation characteristic of airflow changes to that of natural wind with the increase of height which can improve comfort of indoor environment. 相似文献
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末端装置特性对置换通风工作区速度场与温度梯度的影响 总被引:5,自引:0,他引:5
阐述了稍低于室温的空气经靠墙散流器低速进入后,下沉于地面及扩放的概念。介绍了贴地冷气流层速度分布的一般特性,分析了风口特性对地面气流速度场及工作区空气温度梯度的影响。 相似文献
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测试了百叶送风口低温贴附射流温度分布,确定了其射流轴心温度轨迹。测量了射流轴心速度,回归分析得出了其速度衰减特性公式。提出选择适当的送风速度,在低温送风空调系统中能获得满意的空调效果的观点。 相似文献
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Fluctuating airflow may strongly influence the real air exchange rate when using natural ventilation, resulting in a larger
“effective” air exchange rate than the “mean” air exchange rate calculated by conventional methods (i.e., the network method).
To study the effective air exchange rate during natural ventilation under conditions of actual use, this study proposes a
simple model that accounts for fluctuating airflow. The model assumes that the airflow near a building opening fluctuates
regularly and velocity is assumed to have either a square or sine wave pattern. Our analysis shows that the effective air
exchange rate is larger when accounting for fluctuating airflow. This suggests that the mean air exchange rate should not
be calculated without consideration of real airflow fluctuations. 相似文献
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Subways are used widely for public transportation in major cities and require efficient ventilation systems to maintain indoor air quality in the subway tunnel. A subway tunnel was investigated numerically and experimentally to reduce the particle concentration in subway tunnels. The subway tunnel is 54-m long, 1.65-m high, and 2.5-m wide. The subway tunnel is one-quarter scale of a real subway tunnel. The tunnel has two U-type mechanical ventilation shafts. The steady three-dimensional airflow in the tunnel was analyzed using ANSYS CFX software to solve the Reynolds-averaged Navier–Stokes equations. The airflow in the tunnel and shafts was observed numerically using the train-wind and air-curtain. The effects of the train-wind, air-curtain, and electric precipitator were examined experimentally. The ventilation performance in the subway tunnel was observed with respect to the particle concentration in the tunnel. The numerical results suggest proper operating conditions for experimental analysis of the particle concentration. The average velocity of the airflow increases in the shaft when the velocity of the air-curtain increases. The particle concentration at the dust monitoring device after ventilation shaft 1 was reduced significantly in the tunnel when the air-curtain and train-wind were operated. 相似文献