基于YOLOv5的航空图像目标检测方法研究

作者： 文青.   来源： 东莞理工学院 年份： 2023 文献类型 ： 学位论文 关键词： Circular   损失函数   注意力机制   Transformer   YOLOv5   Smooth   Label   Swin  

描述： 基于YOLOv5的航空图像目标检测方法研究

EGMT-CD: Edge-Guided Multimodal Transformers Change Detection from Satellite and Aerial Images

作者： Yunfan   Xiang     Xiangyu   Tian     Yue   Xu     Xiaokun   Guan     Zhengchao   Chen   来源： Remote Sensing 年份： 2023 文献类型 ： 期刊 关键词： sensing   detection   images   edge   Transformer   feature   change   remote   alignment   heterogeneous  

描述： Change detection from heterogeneous satellite and aerial images plays a progressively important role in many fields, including disaster assessment, urban construction, and land use monitoring. Currently, researchers have mainly devoted their attention to change detection using homologous image pairs and achieved many remarkable results. It is sometimes necessary to use heterogeneous images for change detection in practical scenarios due to missing images, emergency situations, and cloud and fog occlusion. However, heterogeneous change detection still faces great challenges, especially using satellite and aerial images. The main challenges in satellite and aerial image change detection are related to the resolution gap and blurred edge. Previous studies used interpolation or shallow feature alignment before traditional homologous change detection methods, which ignored the high-level feature interaction and edge information. Therefore, we propose a new heterogeneous change detection model based on multimodal transformers combined with edge guidance. In order to alleviate the resolution gap between satellite and aerial images, we design an improved spatially aligned transformer (SP-T) with a sub-pixel module to align the satellite features to the same size of the aerial ones supervised by a token loss. Moreover, we introduce an edge detection branch to guide change features using the object edge with an auxiliary edge-change loss. Finally, we conduct considerable experiments to verify the effectiveness and superiority of our proposed model (EGMT-CD) on a new satellite–aerial heterogeneous change dataset, named SACD. The experiments show that our method (EGMT-CD) outperforms many previously superior change detection methods and fully demonstrates its potential in heterogeneous change detection from satellite–aerial images.

基于YOLOv5的航空图像目标检测方法研究

作者： 文青.   来源： 东莞理工学院 年份： 2023 文献类型 ： 学位论文 关键词： Circular   损失函数   注意力机制   Transformer   YOLOv5   Smooth   Label   Swin  

描述： 基于YOLOv5的航空图像目标检测方法研究

基于YOLOv5的航空图像目标检测方法研究

作者： 文青.   来源： 东莞理工学院 年份： 2023 文献类型 ： 学位论文 关键词： Circular   损失函数   注意力机制   Transformer   YOLOv5   Smooth   Label   Swin  

描述： 基于YOLOv5的航空图像目标检测方法研究

基于YOLOv5的航空图像目标检测方法研究

作者： 文青.   来源： 东莞理工学院 年份： 2023 文献类型 ： 学位论文 关键词： Circular   损失函数   注意力机制   Transformer   YOLOv5   Smooth   Label   Swin  

描述： 基于YOLOv5的航空图像目标检测方法研究

基于YOLOv5的航空图像目标检测方法研究

作者： 文青.   来源： 东莞理工学院 年份： 2023 文献类型 ： 学位论文 关键词： Circular   损失函数   注意力机制   Transformer   YOLOv5   Smooth   Label   Swin  

描述： 基于YOLOv5的航空图像目标检测方法研究

EGMT-CD: Edge-Guided Multimodal Transformers Change Detection from Satellite and Aerial Images

作者： Yunfan   Xiang     Xiangyu   Tian     Yue   Xu     Xiaokun   Guan     Zhengchao   Chen   来源： Remote Sensing 年份： 2023 文献类型 ： 期刊 关键词： sensing   detection   images   edge   Transformer   feature   change   remote   alignment   heterogeneous  

描述： Change detection from heterogeneous satellite and aerial images plays a progressively important role in many fields, including disaster assessment, urban construction, and land use monitoring. Currently, researchers have mainly devoted their attention to change detection using homologous image pairs and achieved many remarkable results. It is sometimes necessary to use heterogeneous images for change detection in practical scenarios due to missing images, emergency situations, and cloud and fog occlusion. However, heterogeneous change detection still faces great challenges, especially using satellite and aerial images. The main challenges in satellite and aerial image change detection are related to the resolution gap and blurred edge. Previous studies used interpolation or shallow feature alignment before traditional homologous change detection methods, which ignored the high-level feature interaction and edge information. Therefore, we propose a new heterogeneous change detection model based on multimodal transformers combined with edge guidance. In order to alleviate the resolution gap between satellite and aerial images, we design an improved spatially aligned transformer (SP-T) with a sub-pixel module to align the satellite features to the same size of the aerial ones supervised by a token loss. Moreover, we introduce an edge detection branch to guide change features using the object edge with an auxiliary edge-change loss. Finally, we conduct considerable experiments to verify the effectiveness and superiority of our proposed model (EGMT-CD) on a new satellite–aerial heterogeneous change dataset, named SACD. The experiments show that our method (EGMT-CD) outperforms many previously superior change detection methods and fully demonstrates its potential in heterogeneous change detection from satellite–aerial images.

航空发动机磨损故障多目标融合诊断

作者： 马佳丽     陈果     康玉祥     王雨薇     苗慧慧     曹桂松   来源： 航空动力学报 年份： 2024 文献类型 ： 期刊 关键词： 滚动轴承   一维卷积残差网络   融合诊断   D   S证据理论   磨损故障  

描述： ，实现了航空发动机磨损部位的智能识别；最后，在定性分析部分，利用定性结果和定位结果，根据领域专家的经验，建立了基于if-then的知识规则，找出发动机磨损故障原因；利用实际油液监测数据对所提方法的有效性和可靠性进行验证，诊断精度最高可达到100%，结果充分表明了该方法的正确性、有效性。

航空发动机高速滚动轴承力学特性研究

作者： 唐云冰   来源： 南京航空航天大学 年份： 2016 文献类型 ： 学位论文 关键词： 打滑   滚动轴承   载荷分布   变刚度振动   等效刚度   表面波纹度   疲劳寿命  

描述： 研制的需要,进行航空发动机高速滚动轴承的研究十分必要。本文围绕航空发动机高速滚动轴承的力学特性,开展了以下工作:(1)分别采用拟动力学法和有限元法,建立了滚动轴承力学分析模型,研究了滚动轴承的载荷分布

外圈旋转航空轴承试验机机械结构设计

作者： 闫众   闫国斌   孔令骏   来源： 轴承 年份： 2017 文献类型 ： 期刊 关键词： 外圈旋转   滚动轴承   航空轴承   试验机   静刚度   ANSYS  

描述： 针对航空轴承外圈旋转、内圈静止的工况,通过使用ANSYS分析软件、轴承静刚度计算公式及Flo Xpress流体分析软件等工具,设计了一种特殊的航空轴承试验机机械结构,以验证航空轴承的性能、寿命及极限能力等特性。