In this paper, a mathematical model for topology optimization oftruss structures with constraints of displacement and systemreliability under multiple loading cases is constructed. In order toavoid the difficulty of c...In this paper, a mathematical model for topology optimization oftruss structures with constraints of displacement and systemreliability under multiple loading cases is constructed. In order toavoid the difficulty of computing the structure's system reliability,a solving approach is presented in which the failure probability ofsystem is divided into the sum of a all bars' failures probability bymeans of reliability distribution. In addition, by drawing into thereliability safety factor and the fundamen- tal relationship instructural mechanics, all probability constraints of displacement andstress are equiv- alently displayed as conventional form and linearfunction of the design variables.展开更多
The jacket structure and transition piece comprise the supporting structure of a bottom-fixed offshore wind turbine(OWT)connected to the steel tower,which determines the overall structural dynamic performance of the e...The jacket structure and transition piece comprise the supporting structure of a bottom-fixed offshore wind turbine(OWT)connected to the steel tower,which determines the overall structural dynamic performance of the entire OWT.Ideally,optimal performance can be realized by effectively coordinating two components,notwithstanding their separate design processes.In pursuit of this objective,this paper proposes a concurrent design methodology for the jacket structure and transition piece by exploiting topology optimization(TO).The TO for a three-legged jacket foundation is formulated by minimizing static compliance.In contrast to conventional TO,two separated volume fractions are imposed upon the structural design domain of the jacket structure and transition piece to ensure continuity.A 5 MW(megawatt)OWT supported by a four-legged or three-legged jacket substructure is under investigation.The external loads are derived from various design load cases that are acquired using the commercial software platform DNV Bladed(Det Norske Veritas).Through a comparative analysis of the fundamental frequency and maximum nodal deformation,it was found that the optimized solution demonstrates a reduced weight and superior stiffness.The findings demonstrate the present concurrent design approach using TO can yield significant benefits by reducing the overall design cycle and enhancing the feasibility of the final design.展开更多
针对在厢式货车中的弱光环境下,对自动装箱系统的箱体识别精度低的问题,提出一种基于优化的Kindling the Darkness(KinD)网络与You Only Look Once 11(YOLO 11)目标检测的视觉识别方法。对KinD网络进行结构优化,引入双边滤波降噪和Sobe...针对在厢式货车中的弱光环境下,对自动装箱系统的箱体识别精度低的问题,提出一种基于优化的Kindling the Darkness(KinD)网络与You Only Look Once 11(YOLO 11)目标检测的视觉识别方法。对KinD网络进行结构优化,引入双边滤波降噪和Sobel边缘增强模块,实现图像亮度与细节的有效提升;通过YOLO 11算法检测瓦楞纸箱,进行三维定位与姿态估计。结果表明,优化的KinD网络经图像增强后,平均峰值信噪比达到15.04 dB,结构相似性指数为0.72,图像处理时间为0.338 s;YOLO 11算法对增强图像的目标检测匹配度达到完全匹配26.7%、高匹配42.7%,整体平均位置误差归一化值为0.0143。研究为物流行业的自动装卸工作提供技术支撑。展开更多
基金the National Natural Science Foundation of China
文摘In this paper, a mathematical model for topology optimization oftruss structures with constraints of displacement and systemreliability under multiple loading cases is constructed. In order toavoid the difficulty of computing the structure's system reliability,a solving approach is presented in which the failure probability ofsystem is divided into the sum of a all bars' failures probability bymeans of reliability distribution. In addition, by drawing into thereliability safety factor and the fundamen- tal relationship instructural mechanics, all probability constraints of displacement andstress are equiv- alently displayed as conventional form and linearfunction of the design variables.
基金supports were received from the National Key Research and Development Program of China(2024YFE0208600)New Energy Joint Laboratory of China Southern Power Grid Corporation(GDXNY2024KF03)+2 种基金the National Natural Science Foundation of China(Grant No.U24B2090)National Key R&D Program(No.2022YFB4201300)Science and Technology Project of Huaneng Group(HNKJ24-H78).
文摘The jacket structure and transition piece comprise the supporting structure of a bottom-fixed offshore wind turbine(OWT)connected to the steel tower,which determines the overall structural dynamic performance of the entire OWT.Ideally,optimal performance can be realized by effectively coordinating two components,notwithstanding their separate design processes.In pursuit of this objective,this paper proposes a concurrent design methodology for the jacket structure and transition piece by exploiting topology optimization(TO).The TO for a three-legged jacket foundation is formulated by minimizing static compliance.In contrast to conventional TO,two separated volume fractions are imposed upon the structural design domain of the jacket structure and transition piece to ensure continuity.A 5 MW(megawatt)OWT supported by a four-legged or three-legged jacket substructure is under investigation.The external loads are derived from various design load cases that are acquired using the commercial software platform DNV Bladed(Det Norske Veritas).Through a comparative analysis of the fundamental frequency and maximum nodal deformation,it was found that the optimized solution demonstrates a reduced weight and superior stiffness.The findings demonstrate the present concurrent design approach using TO can yield significant benefits by reducing the overall design cycle and enhancing the feasibility of the final design.
文摘针对在厢式货车中的弱光环境下,对自动装箱系统的箱体识别精度低的问题,提出一种基于优化的Kindling the Darkness(KinD)网络与You Only Look Once 11(YOLO 11)目标检测的视觉识别方法。对KinD网络进行结构优化,引入双边滤波降噪和Sobel边缘增强模块,实现图像亮度与细节的有效提升;通过YOLO 11算法检测瓦楞纸箱,进行三维定位与姿态估计。结果表明,优化的KinD网络经图像增强后,平均峰值信噪比达到15.04 dB,结构相似性指数为0.72,图像处理时间为0.338 s;YOLO 11算法对增强图像的目标检测匹配度达到完全匹配26.7%、高匹配42.7%,整体平均位置误差归一化值为0.0143。研究为物流行业的自动装卸工作提供技术支撑。
