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Effect of Train Carbody's Parameters on vertical bending Stiffness Performance

Chinese Journal of Mechanical Engineering 2016年第6期29卷 1120-1127页

作者： YANG Guangwu WANG Changke XIANG Futeng XIAO Shoune State Key Laboratory of Traction Power Southwest Jiaotong University

Finite element analysis（FEA） and modal test are main methods to give the first-order vertical bending vibration frequency of train carbody at present, but they are inefficiency and waste plenty of time. Based on Timoshenko beam theory, the bending deformation, moment of inertia and shear deformation are considered. Carbody is divided into some parts with the same length, and it＇s stiffness is calculated with series principle, it＇s cross section area, moment of inertia and shear shape coefficient is equivalent by segment length, and the fimal corrected first-order vertical bending vibration frequency analytical formula is deduced. There are 6 simple carbodies and 1 real carbody as examples to test the formula, all analysis frequencies are very close to their FEA frequencies, and especially for the real carbody, the error between analysis and experiment frequency is 0.75%. Based on the analytic formula, sensitivity analysis of the real carbody＇s design parameters is done, and some main parameters are found. The series principle of carbody stiffness is introduced into Timoshenko beam theory to deduce a formula, which can estimate the first-order vertical bending vibration frequency of carbody quickly without traditional FEA method and provide a reference to design engineers.

关键词： train carbody vertical bending vibration frequency analysis formula sensitivity analysis

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考虑不同腐蚀模型的受垂向弯矩作用的FPSO船体梁渐进失效分析

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Journal of Marine Science and Application 2020年第4期19卷 674-692页

作者： Zorareh Nouri Mohammad Reza Khedmati Department of Maritime Engineering Amirkabir University of Technology(Tehran Polytechnic)Tehran 15916-34311Iran

Nowadays,with the increasing operational life of ships,the aging effects on their structural behavior need to be investigated *** the corrosive marine environment taken into consideration,one of the important effects of aging that must be studied is thickness *** this paper,with the use of previously proposed equivalent thickness formulations for corroded plates,the progressive collapse analysis software HULLST is enhanced,and then,the effects of different corrosion models of uniform,random,pitting,and tanker pattern types on the ultimate and residual strengths of a floating production,storage,and offloading vessel hull girder are evaluated for the ages of 0 to 25 *** reveal that the uniform corrosion and random corrosion models have close *** value of relative reduction in the ultimate strength of ship hull girder(compared with the intact condition)ranges roughly from 6%for the age of 5 years to 17%for the age of 25 years in the hogging *** relative reduction in the ultimate strength ranges from 4%to 16%in the sagging *** corrosion and tanker pattern(random)corrosion models lead to higher relative reductions in ultimate *** pitting corrosion model leads to a 16%–32%relative reduction in the ultimate strength for the ages of 5–25 years of the ship in either hogging or *** tanker pattern(random)corrosion model leads to a 6%–37%relative reduction in the ultimate strength in the hogging mode and 3%–31%in the sagging mode at ship ages of 5 to 25 years.

关键词： Uniform corrosion Random corrosion Pitting corrosion Tanker pattern corrosion Progressive collapse analysis vertical bending Ultimate strength Residual strength

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