高精度便携式温湿度露点测量仪的研制

为解决农业、气象研究领域对温度、湿度、露点同时高精度测量与仓储、医疗、食品等行业对高精度温湿度的需求，以及传统湿度测量精度低、稳定性差和校准难度大等缺点，设计了便携式温湿度露点测量仪。采用基于CMOSens^TM技术的单片全校准温湿度传感器SHT75，以超低功耗单片机MSP430F1132为核心进行数据处理，实现了对温度、湿度、露点进行高速、高精度的测量。仪器具有自校准、自恢复、测量工作时间长、稳定性高等优点，目前已经成功应用于农业温室和仓储中。     

多功能温湿度现场校验装置的设计

本文的主要内容是主要利用虚拟仪器技术设计一套多功能温湿度现场校验装置,该装置可连接铂电阻和热电偶测量温度、连接湿度传感器测量湿度、同时还可以测量电压和电流,具有便携、高效、功能多等特点,可用于工作现场的温湿度的校准及测试。     

基于EPA的温湿度测量仪的研究与设计

文中介绍了一种利用EPA技术的在工业以太网上实现数据交换和总线供电的温湿度测量仪的设计方法。该温湿度测量仪的硬件设计方案包含微处理器、存储器、传感器模块、电源模块、网络通信接口等重要组成部分,详细介绍了EPA协议栈实现原理,并由上层组态监控软件完成对其测量数据的在线监测。该设计将数据传输和供电集中在一根网线上实现,降低了用户成本,有较好的市场潜力。     

蔬菜大棚温湿度监控系统的设计与研究

为了实现蔬菜大棚的温湿度环境参数的采集和远程监控,该文设计了基于Arduino控制器和手机远程控制终端的温湿度监控系统。该系统主要由数据采集终端、控制终端和数据融合处理几部分组成。数据采集终端由温湿度传感器、Arduino控制器以及无线传输模块组成,控制终端主要通过智能手机实现远程监控。同时,设计实现了基于PFCM算法以实现对温湿度数据进行融合处理,提高了系统决策和分析的准确度。测试结果表明,系统运行稳定,对数据的处理相比FCM算法更加准确。     

基于SPCE061A的语音湿度测量仪的设计

文章以凌阳16位单片机SPCE061A为控制中心,配合凌阳LCD501液晶模组及电容式湿度传感器HS1101实现了湿度的测量。该湿度测量仪具有实时测量、液晶动态显示和语音播报湿度值功能,可以存储50组湿度值,且当湿度值过高或过低时有提示功能,利用按键控制湿度值的播放及存储。该设计主要创新是利用单片机实施控制,具有存储和语音播报功能。     

基于单片机的温湿度控制系统设计

为提高温湿度控制精度和稳定性,结合 ATmega１６ 单片机和 DHT１１ 温湿度传感器设计了一种温湿度控制系统.该系统可实时采集温度和湿度,并根据计算结果实现降温、升温、加湿和除湿等操作.给出了系统硬件结构和软件设计方法.为进一步提高系统控制精度,基于深度学习网络设计了一种温湿度控制器,可以判断和预测温湿度变化趋势.最后,进行了实验研究.实验结果表明,采用所述温湿度控制方法可提高温度和湿度控制精度,提高系统响应速度,降低系统达到稳态所需时间.     

基于嵌入式的自感应系统设计

设计了一套具有光线感应、温湿度感应及距离感应功能的自感应系统,系统采用的控制设备是树莓派并基于光照强度传感器、温湿度传感器、HC-SR04传感器等核心组件。另外搭配继电器、L298N驱动板、步进电机等辅助组件形成了一个具有探测环境及土壤、环境温湿度、光线强弱、障碍物距离等多种功能的智能小车。该小车具备环境监测功能、自动避障功能以及根据光线强弱调节灯光的功能。     

光纤光栅温湿度检测系统研究

为了实现对室内环境的温度和湿度的实时监测,设计了一种光纤光栅温湿度检测系统。该系统以光纤光栅传感器为温度和湿度检测的敏感元件,利用波分复用技术对光纤光栅传感器进行传感网络的组建,利用F-P腔解调原理对光纤光栅传感器进行波长的解调,采用LabVIEW编写光纤光栅温湿度系统的上位机软件。光纤光栅温湿度检测系统解决了传统电力系统的组网困难,电缆质量重,测量误差大,易受电磁干扰等问题,实现实时监测环境的温湿度和数据的保存,适合各种室内环境的温湿度监测的场合。     

基于STM32的温湿度检测系统设计及实现

温湿度的检测对农业大棚、粮仓存储及呼吸睡眠等都有重要的作用。针对以51单片机为核心的温湿度检测系统处理速度慢、内存限制及外接传感器有限等问题,设计并实现了一款基于STM 32的温湿度监测系统。系统由STM 32芯片作为核心处理器,DHT11温湿度传感器模块作为检测传感器,并由OLED显示屏进行显示。实验结果表明,系统实现了对温度、湿度实时监测,并且具有设计简单、可靠性高、监控数据准确、易于安装、经济实用等特点,在生活、生产、工业等领域中具有一定应用价值。     

基于无线传感器网络的工业环境温湿度监测系统北大核心CSCD

为了满足现代工业生产需求,设计了一种基于无线传感器网络的温湿度监测系统。该系统以MSP430为开发平台,设计了传感器数据采集电路、数据处理传输电路、单片机最小系统电路以及上位机监测平台。基于ZigBee协议的传感器网络负责采集温度、湿度数据,以MSP430微处理器为核心的网关负责数据的接收处理与转发,上位机监测平台则用于实时监测采集到的温度、湿度数据。本系统解决了传统温湿度测量时存在布线困难、不易维护的缺点,适用于工业化生产等复杂环境对温湿度的测量。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.