空调热交换器性能异常检测技术是快速判断民机空调系统运行状态并合理安排维修任务的关键,传统的异常检测方法难以有效处理高维时序数据,无法实现系统早期故障预警。为此,本文提出了一种基于长短期记忆网络(LSTM,long-short term memory...空调热交换器性能异常检测技术是快速判断民机空调系统运行状态并合理安排维修任务的关键,传统的异常检测方法难以有效处理高维时序数据,无法实现系统早期故障预警。为此,本文提出了一种基于长短期记忆网络(LSTM,long-short term memory)与自编码器(AE,autoencoder)模型的无监督异常检测方法,用以识别民机空调系统异常运行状态。首先,基于民机空调系统原始传感器参数构建表征空调热交换器性能的特征监测参数;其次,构建LSTM-AE模型进行数据特征重构并计算重构误差;最后,使用孤立森林(iForest, isolation forest)进行无监督异常监测。将本文构建的无监督异常检测方法与传统方法对比,并建立模型评估指标,验证结果表明,所构建的模型方法可以对民机空调热交换器性能异常状态进行有效检测。展开更多
To address the issues of incomplete information,blurred details,loss of details,and insufficient contrast in infrared and visible image fusion,an image fusion algorithm based on a convolutional autoencoder is proposed...To address the issues of incomplete information,blurred details,loss of details,and insufficient contrast in infrared and visible image fusion,an image fusion algorithm based on a convolutional autoencoder is proposed.The region attention module is meant to extract the background feature map based on the distinct properties of the background feature map and the detail feature map.A multi-scale convolution attention module is suggested to enhance the communication of feature information.At the same time,the feature transformation module is introduced to learn more robust feature representations,aiming to preserve the integrity of image information.This study uses three available datasets from TNO,FLIR,and NIR to perform thorough quantitative and qualitative trials with five additional algorithms.The methods are assessed based on four indicators:information entropy(EN),standard deviation(SD),spatial frequency(SF),and average gradient(AG).Object detection experiments were done on the M3FD dataset to further verify the algorithm’s performance in comparison with five other algorithms.The algorithm’s accuracy was evaluated using the mean average precision at a threshold of 0.5(mAP@0.5)index.Comprehensive experimental findings show that CAEFusion performs well in subjective visual and objective evaluation criteria and has promising potential in downstream object detection tasks.展开更多
分布式显示控制系统(以下简称分布式)被广泛应用于指挥调度、视频会议、信息发布等领域,是高清视频信号传输和调度的核心,也担负着大量音频信号的传输和调度任务。分布式在与音频扩声系统之间相互传输音频信号时,通常需要通过非平衡模...分布式显示控制系统(以下简称分布式)被广泛应用于指挥调度、视频会议、信息发布等领域,是高清视频信号传输和调度的核心,也担负着大量音频信号的传输和调度任务。分布式在与音频扩声系统之间相互传输音频信号时,通常需要通过非平衡模拟信号线缆实现,存在多次数模(Digital to Analog,D/A)和模数(Analog to Digital,A/D)转换,造成音频信号质量显著下降和精度损失。针对该问题,提出将AES67音频网关作为分布式和音频扩声系统之间的桥梁,在2个系统之间通过AES67实现网际互连协议(Internet Protocol,IP)全数字方式转换与传输,保证高质量的音频传输和性能。展开更多
废电解铝阳极碳块经过高温碳化,通过盐酸-硝酸-高氯酸三酸溶解完全后,冷却,完全溶解盐类加入10 mL 1.19 g/mL的盐酸,在优选出最优的仪器工作状态下,创建了ICP-AES法测定废电解铝阳极碳块样品中Fe、Li、K、Ca、Mg的化学分析方法。每个元...废电解铝阳极碳块经过高温碳化,通过盐酸-硝酸-高氯酸三酸溶解完全后,冷却,完全溶解盐类加入10 mL 1.19 g/mL的盐酸,在优选出最优的仪器工作状态下,创建了ICP-AES法测定废电解铝阳极碳块样品中Fe、Li、K、Ca、Mg的化学分析方法。每个元素的校准曲线相关系数均大于0.999,同时对以上多种元素进行检出限、加标回收试验研究,结果表明其相对标准偏差(n=8)为0.60%~2.24%,加标回收率在97.1%~104%。展开更多
文摘空调热交换器性能异常检测技术是快速判断民机空调系统运行状态并合理安排维修任务的关键,传统的异常检测方法难以有效处理高维时序数据,无法实现系统早期故障预警。为此,本文提出了一种基于长短期记忆网络(LSTM,long-short term memory)与自编码器(AE,autoencoder)模型的无监督异常检测方法,用以识别民机空调系统异常运行状态。首先,基于民机空调系统原始传感器参数构建表征空调热交换器性能的特征监测参数;其次,构建LSTM-AE模型进行数据特征重构并计算重构误差;最后,使用孤立森林(iForest, isolation forest)进行无监督异常监测。将本文构建的无监督异常检测方法与传统方法对比,并建立模型评估指标,验证结果表明,所构建的模型方法可以对民机空调热交换器性能异常状态进行有效检测。
文摘To address the issues of incomplete information,blurred details,loss of details,and insufficient contrast in infrared and visible image fusion,an image fusion algorithm based on a convolutional autoencoder is proposed.The region attention module is meant to extract the background feature map based on the distinct properties of the background feature map and the detail feature map.A multi-scale convolution attention module is suggested to enhance the communication of feature information.At the same time,the feature transformation module is introduced to learn more robust feature representations,aiming to preserve the integrity of image information.This study uses three available datasets from TNO,FLIR,and NIR to perform thorough quantitative and qualitative trials with five additional algorithms.The methods are assessed based on four indicators:information entropy(EN),standard deviation(SD),spatial frequency(SF),and average gradient(AG).Object detection experiments were done on the M3FD dataset to further verify the algorithm’s performance in comparison with five other algorithms.The algorithm’s accuracy was evaluated using the mean average precision at a threshold of 0.5(mAP@0.5)index.Comprehensive experimental findings show that CAEFusion performs well in subjective visual and objective evaluation criteria and has promising potential in downstream object detection tasks.
文摘分布式显示控制系统(以下简称分布式)被广泛应用于指挥调度、视频会议、信息发布等领域,是高清视频信号传输和调度的核心,也担负着大量音频信号的传输和调度任务。分布式在与音频扩声系统之间相互传输音频信号时,通常需要通过非平衡模拟信号线缆实现,存在多次数模(Digital to Analog,D/A)和模数(Analog to Digital,A/D)转换,造成音频信号质量显著下降和精度损失。针对该问题,提出将AES67音频网关作为分布式和音频扩声系统之间的桥梁,在2个系统之间通过AES67实现网际互连协议(Internet Protocol,IP)全数字方式转换与传输,保证高质量的音频传输和性能。
文摘废电解铝阳极碳块经过高温碳化,通过盐酸-硝酸-高氯酸三酸溶解完全后,冷却,完全溶解盐类加入10 mL 1.19 g/mL的盐酸,在优选出最优的仪器工作状态下,创建了ICP-AES法测定废电解铝阳极碳块样品中Fe、Li、K、Ca、Mg的化学分析方法。每个元素的校准曲线相关系数均大于0.999,同时对以上多种元素进行检出限、加标回收试验研究,结果表明其相对标准偏差(n=8)为0.60%~2.24%,加标回收率在97.1%~104%。
