Article
Engineering, Civil
Hailong Lu, Murilo Augusto Vaz, Marcelo Caire
Summary: This paper presents a nonlinear finite element model for the flexible riser with bend stiffener, taking into account interlayer friction and riser-bend stiffener contact interaction. A case study is carried out to assess the influence of curvature variation and bend stiffener contact pressure on the riser tensile armours stresses under extreme and fatigue load cases. The results show that the model with bend stiffener interaction predicts larger stresses compared to the uniform curvature FEM and analytical models under extreme loading, and significant differences in cumulative damage are observed between the models under typical fatigue loading conditions.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Marine
Jianxing Yu, Fucheng Wang, Yang Yu, Haoda Li, Xin Liu, Ruoke Sun
Summary: A fatigue spectrum analysis and reliability analysis method for a nine-layer flexible riser structure were proposed in this paper, and a complete fatigue and reliability analysis process for multilayer structures was developed. The stress response of the multilayer flexible riser was analyzed using finite element software, and a stress response spectrum was formed using the method of random number simulation. The fatigue damage degree of each layer was calculated using an appropriate S-N curve, and the fatigue damage nephogram was displayed to analyze the structural fatigue damage.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Chiemela Victor Amaechi, Ahmed Reda, Idris Ahmed Ja'e, Chunguang Wang, Chen An
Summary: The increasing energy demand has led to exploration in the oil and gas industry. Hybrid flexible composite risers, made up of multiple layers of materials, have become more adaptable and are popular in various floating production systems. Innovative monitoring methods, such as Fiber Optics Bragg Gratings, aid in measuring and recording riser data.
Article
Engineering, Marine
Hailong Lu, Murilo Augusto Vaz, Marcelo Caire, Irving David Hernandez
Summary: The interaction between the flexible riser and top connection with floating production units can lead to uncertainties in the integrity assessment of the tensile armor, due to the non-uniform curvature and contact pressure distribution caused by the bend stiffener. This study investigates the mechanical behavior of a full-scale flexible riser and bend stiffener through experimental and numerical methods. Good correlations are found between the experimental and numerical results.
Article
Engineering, Mechanical
Genshen Liu, Huaiju Liu, Caichao Zhu, Tianyu Mao, Gang Hu
Summary: The fatigue failure of gear transmission is a key factor that limits the performance and service life of wind turbines. The disregard of dynamic fatigue reliability in conventional design methods under random loading conditions leads to various issues, such as overweight structure or insufficient fatigue reliability. A novel gear transmission optimization model based on dynamic fatigue reliability sensitivity is developed to predict the optimal structural parameters, reducing volume by 3.58% while ensuring fatigue reliability.
FRONTIERS OF MECHANICAL ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Zhonglai Wang, Dongyu Zhao, Yi Guan
Summary: This paper proposes a novel flexible-constrained time-variant hybrid reliability-based design optimization model to balance resources and reliability during the design stage under lower and upper bounds. The infeasible region pruning-based Kriging method is used for hard constraints, while a combination of Kriging and high-dimensional model representation is used for flexible constraints to improve efficiency.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Engineering, Marine
Qingsheng Liu, Hongxiang Xue, Wenyong Tang
Summary: This paper investigates the behavior of a typical unbonded flexible riser model with composite armor layers under specific loading conditions. The numerical model is validated through experimental results and discusses the bending properties of the riser, as well as the stress distribution at different angles.
Article
Materials Science, Multidisciplinary
Jong-Sung Lee, Young-Joo Lee, Jaegeun Seol, Young-Chang Joo, Byoung-Joon Kim
Summary: This study successfully reduced the mechanical damage of interconnects in highly integrated flexible electronics by introducing an interconnect architecture that bypassed the strain concentration area. It is expected to improve the design guidelines for mechanically reliable interconnects.
ELECTRONIC MATERIALS LETTERS
(2023)
Article
Engineering, Marine
Jixiang Song, Weimin Chen, Shuangxi Guo, Dingbang Yan
Summary: With the development of deep-sea oil and gas resources, the aspect ratio of deep-sea flexible risers has become challenging for achieving an equal scale experimental model, leading to the proposal of a distortion model based on the distortion similarity method. The study indicates that the selection of the aspect ratio for the distortion model should consider factors like natural frequency similarity, pretension non-satisfaction similarity, and error analysis, with the transverse direction satisfying dynamic similarity and the longitudinal direction satisfying static similarity.
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Marine
Liangbin Xu, Pengji Hu, Yanwei Li, Na Qiu, Guoming Chen, Xiuquan Liu
Summary: The fatigue reliability assessment of deepwater risers is crucial for oil and gas development safety. An improved method using data-driven models and Bayesian inference was proposed for efficient and accurate assessment of riser fatigue reliability. The proposed method can enhance the accuracy and efficiency of fatigue analysis for deepwater risers.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Ning Zhang, Sen Li, Baojiang Sun, Chloe Huang, Kevin Huang, Yuyang Zeng, Chengcheng Liu
Summary: This paper presents a new stress calculation method for flexible structures, focusing on tensile armors, and applies it to flexible riser fatigue analysis. The method is based on a 3-dimensional curved bar theory and includes the description of the armor center line, derivation of tensile and bending stiffness, and the stress calculation formula. Benchmarking and application results show the validity and effectiveness of this method.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Civil
Jun Yan, Qi Su, Rundong Li, Jinjin Xu, Qingzhen Lu, Zhixun Yang
Summary: Umbilical cable is designed with a specific global configuration to compensate for the floating body motion during deep sea oil and gas exploration. Fatigue analysis is necessary to ensure safe operation, but the numerous sea conditions result in a huge amount of calculation. This study proposes a global configuration optimization design method for lazy-wave umbilical cable based on representative fatigue conditions, resulting in an optimal design with anti-fatigue performance and economic cost.
IEEE JOURNAL OF OCEANIC ENGINEERING
(2023)
Article
Chemistry, Analytical
Fuhao Ouyang, Yuanlin Guan, Chunyu Yu, Xixin Yang, Qi Cheng, Jiawei Chen, Juan Zhao, Qinghai Zhang, Yang Guo
Summary: This study proposes an optimization design method for a rigid-flexible soft finger to improve the poor rigidity of soft grippers. The interaction between rigid and soft materials is analyzed using the finite element method, and the influence of parameters on the bending angle is studied. The optimal parameters are obtained and experimentally verified, with a maximum bending angle of 19.66 degrees and a maximum error of 3.84%. The soft gripper with three fingers can grasp various objects, with a maximum grasping quality of 11.21 g.
Article
Computer Science, Interdisciplinary Applications
Shuo Zheng, Chunmei Liu, Ali Abd El-Aty, Shenghan Hu, Xueshan Bai, Jin Sun, Xunzhong Guo, Jie Tao
Summary: This study proposed a new design, analytical algorithms, and control of a novel 6-DOF robot flexible bending (RFB) system for manufacturing bending components with complex spatial structures. The feasibility of the system and the reliability of the analytical algorithms were verified through bending experimentation on a spatial spiral tube. The results showed that the system could effectively form complex-shaped hollow components, although there were some deviations in the test sample.
ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING
(2023)
Review
Chemistry, Analytical
Rafat Saleh, Maximilian Barth, Wolfgang Eberhardt, Andre Zimmermann
Summary: Flexible electronics is a rapidly growing technology with applications in various fields, with a focus on reliability during repeated bending. This paper presents commonly used methods for investigating the bending reliability of flexible electronics, including both static and dynamic bending test methods.
Article
Engineering, Marine
Hezhen Yang, Yun Zhu
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
(2015)
Article
Engineering, Marine
Hezhen Yang, Peiji Xu
Article
Green & Sustainable Science & Technology
Hezhen Yang, Yun Zhu, Qijin Lu, Jun Zhang
Article
Engineering, Ocean
Zhiqian Wang, Hezhen Yang
APPLIED OCEAN RESEARCH
(2016)
Article
Engineering, Marine
Huan Mao, Hezhen Yang
INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING
(2016)
Article
Engineering, Marine
Hezhen Yang, Zhiqian Wang, Fei Xiao
SHIPS AND OFFSHORE STRUCTURES
(2017)
Article
Engineering, Civil
Yang He-zhen, Ding Jin-hong, Li Qing-quan, Li Hua-jun
CHINA OCEAN ENGINEERING
(2014)
Article
Engineering, Civil
Yang He-zhen, Jiang Hao, Yang Qi
CHINA OCEAN ENGINEERING
(2014)
Article
Engineering, Marine
Fei Xiao, He Zhen Yang
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
(2014)
Article
Engineering, Ocean
Hezhen Yang, Qingquan Li, Huajun Li
JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME
(2013)
Article
Engineering, Marine
Hezhen Yang, Fei Xiao
Article
Engineering, Marine
Hezhen Yang, Jinfeng Chen, Qijin Lu, Ning Ma
SHIPS AND OFFSHORE STRUCTURES
(2014)
Article
Oceanography
Liu Hao, Yang Hezhen, Liu Fushun
JOURNAL OF OCEAN UNIVERSITY OF CHINA
(2014)
Proceedings Paper
Energy & Fuels
Xiaodong Zhang, Hezhen Yang, Peter Francis Bernad Adaikalaraj, Ying Min Low, Chan Ghee Koh
PROCEEDINGS OF THE ASME 36TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2017, VOL 3B
(2017)
Article
Engineering, Civil
Zhang Xiao, Yang He-zhen, Xiao Fei, Xu Pei-ji
CHINA OCEAN ENGINEERING
(2017)
