当前工业化养殖胡瓜钝绥螨的产量巨大,导致现有人工品质管控方式无法及时准确地对螨虫养殖品质进行监测.设计研发一款螨虫监控系统,包含螨虫麦麸分离装置、显微视觉装置、改进的YOLOv5 螨虫检测模型.通过对YOLOv5 模型的网络结构进行分析,在原YOLOv5 模型上将嵌入ECANet注意力机制的MobileNetv3-Large网络作为主干特征提取网络,加强网络提取特征能力,进一步通过裁剪模型预测头的冗余部分,提升模型对中小目标检测性能.实验结果表明:改进后的M3ECA-YOLOv5-2H模型对比原YOLOv5 模型,在平均检测精度mAP50 和mAP75上提高了 0.68 和 4.62 个百分点;在模型大小上降低 18.9 MB,占用更低内存;在单张图片推理速度上提升 4 ms.此外对比其他 5 种通用目标检测模型,M3ECA-YOLOv5-2H模型在检测精度和检测速度等指标上整体表现更佳,具有很好的应用价值.

针对目前我国许多建筑施工过程中的骨料罐装仍然是由传统的简单电气控制配合人工进行工作,存在物料流量难把控、效率低、安全性差等问题,在对传统骨料散装机结构采用旋转阀机构改进的基础上,提出基于三菱PLC的骨料散装机精准下料控制系统设计方案,完成了结构设计和PLC控制系统的开发.该控制系统实现了骨料散装机原料下落连续化、自动化,并在市电断电时能够自动关阀.经实际生产验证,该骨料散装机运行良好,改善了工作效率并提高了建筑工地灌装施工的质量效益.

针对胡瓜钝绥螨体积小、与粉螨相似、难以分类计数问题,提出一种基于YOLOv4胡瓜钝绥螨自动检测计数方案.在多时间段、分批次拍摄螨虫照片制作数据集,通过构建YOLOv4深度学习模型对螨虫图像进行特征提取和高精度分类检测.结果表明,基于YOLOv4的螨虫识别模型能在图像存在杂质且螨虫相连情况下准确检测胡瓜钝绥螨,平均检测单幅图片耗时约0.137 s.在测试集中对胡瓜钝绥螨检测精度达到99.45％,粉螨检测精度达到93.94％.对胡瓜钝绥螨和粉螨检测精度均值(mAP)达到96.69％,分别比YOLOv4-Tiny、YOLOv3、Faster-RCNN、EfficientDet模型高14.85、2.12、35.77、27.18百分点.设计螨虫GUI(图形用户界面)品质监控界面,方便检测人员操作.本研究提出的检测方案具有很高的应用价值,能够精准、快速识别胡瓜钝绥螨,可为胡瓜钝绥螨养殖质量检测提供技术支撑.

基于小波分解频带能量特征和BP神经网络的方法识别油浸式变压器短路故障.利用电弧光信号进行油浸式变压器短路故障诊断,对不同工况下的光信号进行多分辨率分析的四层小波分解,选择合适的重构小波系数,提取特征频带.对提取出的特征频带的小波系数作平方和归一化处理,求出每个特征频带的能量,作为特征参数输入到BP神经网络模型中进行训练和故障识别.

中药粉剂配方下药系统是一个精度高、反应大滞后的系统,难以使用传统的方法进行下药控制.为有效实现中药粉剂快速、稳定、高精确度的下药问题,本文提出一种利用三次多项式加减速控制算法来实现在线分析医生处方上的中药粉剂配量,并通过Profibus光纤模块控制远程变频电机以计算所得运动曲线进行下药控制.实验结果验证了此方法的有效性.

Welcome to the WIT Press eLibrary - the home of the Transactions of the Wessex Institute collection, providing on-line access to papers presented at the Institute's prestigious international conferences and from its State-of-the-Art in Science & Engineering publications.

This paper discussed how to apply radio frequency identification and positioning technology to seismic site communication management system.Primary implementation of uniting dispatch,track and managing seismic site resource(including rescuer staff,vehicle and facility) is helpful to realize site resource management and enhance use efficiency.

A type of state virtual detection system based on LabVIEW for electromechanical equipment was developed.Layered module structure of the system was presented.Wavelet analysis was adopted in data processing,which enabled on-line state detection and fault diagnosis.Simulation results demonstrate that the system possesses desirable dynamic and adaptive properties and can meet the demands of different-featured electromechanical equipment and the processing of diversified testing signals.

The communication environment in the earthquake site is extremely complex.When earthquake occurs,it is difficult to use public network to guarantee the communication between earthquake site and emergency headquarters in real time as well as to transfer the video fille.According to destructive situations caused by the earthquakes,in view of different condition of communication network in the earthquake site,as well as the emergency demands,several solutions to guarantee the correspondence in the earthquake site have been proposed in this paper.

Based on features of radio frequency identification(RFID),the paper puts forward a model of the access control system appling radio frequency identification,and introduces the realization of the software and the hardware of the system.The accuracy of identify is high,the anti-interference ability is strong,and the correspondence is reliable.

介绍了利用AT89C51单片机控制的超声波测距系统的原理。给出了系统构成,并在数据处理中采用了温度补偿修正。此系统具有易控制、工作可靠、测量精度高的优点,可实时监控液位。

This article includes a system of temperature control of heating furnace based on PLC and Configuration Software. The system adopts a principal and subordinate control system which was formed with PC and PLC. KingView supervisory combination software is used in the design, and KingView’s dynamic database can connect well with siemens PLC by hotlink to form a temperature controlling system.