A probabilistic method based on principle of maximum entropy was employed to analyze the randomness of contact force between geomembrane and granular material.The contact force distribution is exponential according to...A probabilistic method based on principle of maximum entropy was employed to analyze the randomness of contact force between geomembrane and granular material.The contact force distribution is exponential according to the proposed method and the grain size is the most important factor that affects the distribution of contact force.The proposed method is then verified by a series of laboratory experiments using glass beads and cobbles as granular material and a very thin pressure,indicating that film is firstly used in these experiments which give a reliable method to measure the contact force at each contact point.展开更多
针对输电线路巡检中无人机拍摄角度下器械易形变及带臂机械不同工作状态下特征复杂难以捕获的问题,提出一种基于阶梯式特征融合的外力破坏检测方法。该方法首先通过融合可变形大卷积核注意力网络提取无人机拍摄图像的特征信息;其次,利...针对输电线路巡检中无人机拍摄角度下器械易形变及带臂机械不同工作状态下特征复杂难以捕获的问题,提出一种基于阶梯式特征融合的外力破坏检测方法。该方法首先通过融合可变形大卷积核注意力网络提取无人机拍摄图像的特征信息;其次,利用多尺度序列特征融合模块进行阶梯式特征融合;然后,对检测头进行轻量化操作以减少参数量;最后,提出渐变完全交并比抑制(gradual complete intersection over union non-maximum suppression,GCIoU NMS)损失函数优化模型。在自建数据集上的实验表明,该方法的mAP50%和mAP50%-95%分别提高10.5和10.2百分点,达到86.8%和58.4%;在VOC数据集上,mAP50%和mAP50%-95%分别提高7.3和8.1百分点,达到79.5%和58.8%。实验结果表明,该方法有效提升了目标检测性能,对复杂环境下输电线路外部破坏检测具有重要参考价值。展开更多
基金Project(51079047)supported by the National Natural Science Foundation of ChinaProject Funded by the Priority Academic Program of Jiangsu Higher Education Institutions,China
文摘A probabilistic method based on principle of maximum entropy was employed to analyze the randomness of contact force between geomembrane and granular material.The contact force distribution is exponential according to the proposed method and the grain size is the most important factor that affects the distribution of contact force.The proposed method is then verified by a series of laboratory experiments using glass beads and cobbles as granular material and a very thin pressure,indicating that film is firstly used in these experiments which give a reliable method to measure the contact force at each contact point.
文摘针对输电线路巡检中无人机拍摄角度下器械易形变及带臂机械不同工作状态下特征复杂难以捕获的问题,提出一种基于阶梯式特征融合的外力破坏检测方法。该方法首先通过融合可变形大卷积核注意力网络提取无人机拍摄图像的特征信息;其次,利用多尺度序列特征融合模块进行阶梯式特征融合;然后,对检测头进行轻量化操作以减少参数量;最后,提出渐变完全交并比抑制(gradual complete intersection over union non-maximum suppression,GCIoU NMS)损失函数优化模型。在自建数据集上的实验表明,该方法的mAP50%和mAP50%-95%分别提高10.5和10.2百分点,达到86.8%和58.4%;在VOC数据集上,mAP50%和mAP50%-95%分别提高7.3和8.1百分点,达到79.5%和58.8%。实验结果表明,该方法有效提升了目标检测性能,对复杂环境下输电线路外部破坏检测具有重要参考价值。
