Bundled hybrid offset riser (BHOR) global strength analysis, which is more complex than single line offset riser global strength analysis, was carried out in this paper. At first, the equivalent theory is used to deal...Bundled hybrid offset riser (BHOR) global strength analysis, which is more complex than single line offset riser global strength analysis, was carried out in this paper. At first, the equivalent theory is used to deal with BHOR, and then its global strength in manifold cases was analyzed, along with the use of a three-dimensional nonlinear time domain finite element program. So the max bending stress, max circumferential stress, and max axial stress in the BHOR bundle main section (BMS) were obtained, and the values of these three stresses in each riser were obtained through the "stress distribution method". Finally, the Max Von Mises stress in each riser was given and a check was made whether or not they met the demand. This paper provides a reference for strength analysis of the bundled hybrid offset riser and some other bundled pipelines.展开更多
目的 利用高分辨3.0 T MRI技术,探讨后足肌腱韧带解剖及损伤的影像学表现,为后足损伤的诊断与治疗提供解剖学和影像学依据。方法 回顾性分析2015年6月至2021年9月65例外伤疼痛经手术或随访证实的后足肌腱韧带损伤患者和15名健康志愿者(3...目的 利用高分辨3.0 T MRI技术,探讨后足肌腱韧带解剖及损伤的影像学表现,为后足损伤的诊断与治疗提供解剖学和影像学依据。方法 回顾性分析2015年6月至2021年9月65例外伤疼痛经手术或随访证实的后足肌腱韧带损伤患者和15名健康志愿者(30足)的临床资料和影像学表现。所有志愿者及后足外伤患者均行中后足冠状位、矢状位和轴位的MRI T_1WI和质子密度加权脂肪抑脂(PD-FS)序列检查。分析后足肌腱韧带正常解剖及损伤后的MRI表现。结果 15名健康志愿者(30足)的后足肌腱韧带表现为均匀条状或线样低信号,其中腓骨长肌肌腱、腓骨短肌腱和跟腱表现为条带状均匀低信号,而跟骰韧带、足底筋膜表现为线样低信号。65例后足肌腱韧带损伤患者中,腓骨长肌肌腱损伤10例,腓骨短肌肌腱损伤17例,跟骰韧带损伤10例,足底筋膜炎12例,跟腱损伤16例。损伤的肌腱韧带T_1WI序列表现为纤维不连续、增粗、模糊,PDFS序列表现为肌腱韧带走行区内不均匀高信号,腱鞘积液,部分撕裂表现为纤维不连续、增粗。完全撕裂表现为纤维中断、回缩,断端纤维结构消失,被液体充填,其周围软组织水肿。结论 高分辨3.0 T MRI可清晰显示后足肌腱韧带的精细解剖结构和损伤的影像学表现,对后足肌腱韧带损伤的早期诊断和治疗具有重要的临床应用价值。展开更多
基金Supported by the National Natural Science Foundation of China (Grant No.51009033)
文摘Bundled hybrid offset riser (BHOR) global strength analysis, which is more complex than single line offset riser global strength analysis, was carried out in this paper. At first, the equivalent theory is used to deal with BHOR, and then its global strength in manifold cases was analyzed, along with the use of a three-dimensional nonlinear time domain finite element program. So the max bending stress, max circumferential stress, and max axial stress in the BHOR bundle main section (BMS) were obtained, and the values of these three stresses in each riser were obtained through the "stress distribution method". Finally, the Max Von Mises stress in each riser was given and a check was made whether or not they met the demand. This paper provides a reference for strength analysis of the bundled hybrid offset riser and some other bundled pipelines.
文摘目的 利用高分辨3.0 T MRI技术,探讨后足肌腱韧带解剖及损伤的影像学表现,为后足损伤的诊断与治疗提供解剖学和影像学依据。方法 回顾性分析2015年6月至2021年9月65例外伤疼痛经手术或随访证实的后足肌腱韧带损伤患者和15名健康志愿者(30足)的临床资料和影像学表现。所有志愿者及后足外伤患者均行中后足冠状位、矢状位和轴位的MRI T_1WI和质子密度加权脂肪抑脂(PD-FS)序列检查。分析后足肌腱韧带正常解剖及损伤后的MRI表现。结果 15名健康志愿者(30足)的后足肌腱韧带表现为均匀条状或线样低信号,其中腓骨长肌肌腱、腓骨短肌腱和跟腱表现为条带状均匀低信号,而跟骰韧带、足底筋膜表现为线样低信号。65例后足肌腱韧带损伤患者中,腓骨长肌肌腱损伤10例,腓骨短肌肌腱损伤17例,跟骰韧带损伤10例,足底筋膜炎12例,跟腱损伤16例。损伤的肌腱韧带T_1WI序列表现为纤维不连续、增粗、模糊,PDFS序列表现为肌腱韧带走行区内不均匀高信号,腱鞘积液,部分撕裂表现为纤维不连续、增粗。完全撕裂表现为纤维中断、回缩,断端纤维结构消失,被液体充填,其周围软组织水肿。结论 高分辨3.0 T MRI可清晰显示后足肌腱韧带的精细解剖结构和损伤的影像学表现,对后足肌腱韧带损伤的早期诊断和治疗具有重要的临床应用价值。
