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111.
Gao Renliang Huang Chengkui Yang Guoxian Associate Professor Dalian University of Technology Dalian Senior Engineer Dalian University of Technology Dalian Professor Dalian University of Technology Dalian 《中国海洋工程》1993,(2)
This paper introduces the process and result of fatigue test of steel (Z direction steel) welded T tubular joints used in offshore engineering. Detailed measurement of stress concentration factor, stress distribution, fatigue life and crack development has been performed. Through analysis, an empirical formula of stress concentration factor for T tubular joints, fatigue S-N curve and crack propagation rule are obtained. 相似文献
112.
Chu Liangcheng Qu Naisi Guo Yonggang Lu Min Ph.D. Dalian University of Technology Dalian
Associate Professor Dalian University of Technology Dalian
Assistant M.S. Dalian University of Technology Dalian
Engineer Bohai Oil Company Tianjin 《中国海洋工程》1993,(4)
- Theoretically speaking, it is impossible to make the differential equation of motion uncoupled for the natural modes of a system in consideration of the attached water. The hydro-elastic structure is equal to the, non-proportional damping system. In this paper a perturbation analysis method is put forward. The structure motion equation is strictly solved mathematically, and the non-proportional damping problem is transformed into a series of proportional damping ones in the superposition form. The paper also presents the calculation formula of the dyanamic response of the structure being subjected to harmonic and arbitrary load. The convergence of the proposed method is also studied in this paper, and the corresponding convergence conditions are given. Finally, the proposed method is used to analyze the displacement response of a real offshore platform. The calculation results show that this method has the characteristics of high accuracy and fast convergence. 相似文献
113.
大连上震旦统地震灾变事件研究 总被引:20,自引:4,他引:16
笔者在大连工作区的上震旦统南关岭组、甘井子组和营城子组碳酸盐岩地层中,识别出以震动液化脉、震动液化角砾岩、碳酸盐岩注积岩等震积岩为代表的古地震灾变事件层(工作区缺失上震旦统顶部的兴民村组震积岩),这在工作区属首次发现,这一发现进一步提高了辽南震旦系的研究程度,证明了辽南地区晚震旦世存在4个地震活跃期,从而为区域地层对比提供了新的实际材料,新发现的甘井子组白云岩中的地震灾变事件层表现为白云石质的震动液化脉及液化卷曲变形,是对辽南震旦系研究程度的提高和丰富。 相似文献
114.
115.
大连三道沟山体预裂爆破降震效果 总被引:4,自引:0,他引:4
大连东北路工程三道沟路段山体爆破点距净水厂蓄水池很近,为了确保蓄水池安全和施工进度,在微差爆破的基础上,采用预裂爆破降震技术,收到了良好效果。 相似文献
116.
辽宁区域地震短波通信网对电磁波在无线通信中的传播特性及频率选择等问题,没有进行深入的理论研究和探讨。笔者将通信工作的实践经验升至理论的高度,研究探讨辽宁区域地震短波通信传播特性和频率选择办法,达到在短波数据通信中,选择最佳频率,增加沟通率的目的 相似文献
117.
介绍了CTM—DI磁力仪的性能及应用,根据实践经验提出了在使用该仪器过程中应注意的几个问题。 相似文献
118.
混凝土试验中一类特殊问题的拟合方法研究 总被引:1,自引:0,他引:1
混凝土多轴疲劳试验样本因其含有大量的重复数据和试验数据离散性极大,因此许多传统的方程拟合方法都不适于这类特殊问题。对基于最小二乘法的多元线性或可化为线性的非线性拟合问题,对一切可能方程的求法进行了改进,并对各种方法进行了全面比较研究,最后找到了适用于混凝土疲劳这一类特殊问题拟合的R估计方法。利用相对较好的拟合方程查找异常值,然后据此分析异常值产生的原因,从而指导进一步的试验或者对异常值进行有效处理。 相似文献
119.
WANG Yanying QIAN Kun ZHURenchuan Professor School of Naval Architecture Marine Engineering Dalian University of Technology 《中国海洋工程》1998,(4)
In order to determine the extreme sea-state encountered by oceangoing vessels,a method forthe prediction of wave parameters based on the data of long-term distribution sample is developed by useof the fitting approach with the Weibull probability functions and the power functions.As an example aspecial calculation result is given including the analysis of wave parameters for the data of the NorthAtlantic Basin and the computation of motion and load encountered by two container ships CSLR andCSBV in different loading conditions.All computation results are satisfactory compared with corre-sponding design results. 相似文献
120.
In the nearshore,the wave field contains reflected and incident waves in which there iscorrelation between their phases due to the effect of reflection by some obstacles.Based on the extendedeigenvector method(EEV)derived by Guan et al.,a modified method(MEEV)is proposed as a generaland practical approach to estimating directional spectra for the co-existent field of incident and reflectedwaves and a formula is given for direct calculation of the reflection coefficient.The results of numericalsimulations show that MEEV is superior to EEV in resolution power,and the computed reflectioncoefficient agrees well with the real value within a certain range of incident angle. 相似文献