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21.
为保证发动机前安装支架的结构强度,对前支架进行了强度仿真分析。使用有限元方法计算前支架的应力及能承受的极限载荷,基于动力总成—悬置系统多体动力学仿真模型计算得到前支架的使用载荷。仿真结果表明,前支架的初始结构存在强度问题,基于仿真分析结果,对前支架初始结构进行了改进设计,道路试验结果表明,前支架的结构改进有效。 相似文献
22.
通过回顾公铁交锋历程,提出公路客运面临的问题,在分析高速铁路客运与公路客运各自的优劣势的基础上,提出公路客运增优降劣策略。 相似文献
23.
从原材料、配合比、养护条件、施工工艺等几个方面简要阐述了影响水泥混凝土强度的因素,可为水泥混凝土结构的设计及试验分析提供思考。 相似文献
24.
车轮是汽车的安全部件,不仅影响汽车的行驶性能,还影响汽车的行驶安全性,应具有足够的刚度和疲劳强度。车轮的强度不仅与轮胎气压、车辆重量、轮胎最大载荷、车辆速度、使用温度和腐蚀等使用环境有关,还受到与之连接零件轮毂的结构影响。文章对不同轮毂结构对车轮强度的影响进行分析和验证,通过优化轮毂结构可以提升车轮的安全率和使用寿命,给解决车轮开裂问题和车轮轻量化设计提供新的思路。 相似文献
25.
Jeom Kee Paik Jae Myung Lee Young II Park Joon Sung Hwang Chang Wook Kim 《Marine Structures》2003,16(8):567-600
Many bulk carrier losses have been reported of late, and one of the possible causes of such casualties is thought to be the structural failure of aging hulls in rough weather. In aging ships, corrosion and fatigue cracks are the two most important factors affecting structural safety and integrity. This paper uses a set of the time-dependent corrosion wastage models for 23 different member locations/categories of bulk carriers previously developed by the authors, based on the available corrosion measurements for existing large bulk carrier structures. Differences due to the location and corrosion severity of every member type are taken into account. The nominal design corrosion values for the primary members are suggested based on the annualized corrosion rates obtained in the present study. The effect of time-variant corrosion wastage on the ultimate hull girder strength as well as the section moduli is studied. The criteria for repair and maintenance of heavily corroded structural members so as to keep the ultimate longitudinal strength at an acceptable level are discussed. Important insights and conclusions developed are summarized. 相似文献
26.
本文通过对37300DWT这一特定船的结构设计方案进行分析,对于如何进行货舱结构布置及货舱结构强度校核,谈一些建议及体会。 相似文献
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Masahiko Fujikubo Taoyun Xiao Kazuhiro Yamamura 《Journal of Marine Science and Technology》2003,7(3):119-127
A structural safety assessment of a pontoon-type very large floating structure (VLFS) surrounded by a gravity-type breakwater
was carried out for extreme wave conditions by considering the damage to the breakwater. Bending and shear collapses are considered
to be a failure mode of the floating structure, while overturning damages the breakwater. The probability of the breakwater
overturning, and the transmitted wave height before and after damage to the breakwater, are evaluated using design formulae
for port and harbor facilities in Japan. The ultimate bending and shear strengths of the floating structure are calculated
by the idealized structural unit method (ISUM) and FEM, respectively. The calculated failure probability for the floating
structure is compared with the specified target safety level. It was found that the floating structure under consideration
is most likely to fail by bending in transverse waves, and that the corresponding failure probability satisfies the target
level.
Received: September 12, 2002 / Accepted: October 4, 2002
Acknowledgment. The authors are grateful to Dr. Shigeo Ohmatsu, National Maritime Research Institute, Japan, for allowing us to use the program
of hydroelastic response analysis.
Address correspondence to: M. Fujikubo (e-mail: fujikubo@naoe.hiroshima-u.ac.jp)
Updated from the Japanese original, which won the 2002 SNAJ prize (J Soc Arthit Jpn 2002;190:337–345) 相似文献
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