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141.
Dynamic Load Identification in Time Domain 总被引:1,自引:0,他引:1
Chu Liangcheng Qu Natsi Wu Ruifeng Lu Min Yang Guojin Assistant M. S. Dalian University of Technology Dalian
Associate Professor Dalian University of Technology Dalian
Professor Dalian University of Technology Dalian
Engineer Bohai Oil Company
Senior Engineer Bohai Oil Company 《中国海洋工程》1991,(3)
- In the time domain method the dynamic load is successfully identified when the accelerations, velocities and displacements or velocities and displacements of the structure are known. But in engineering practice or experiments usually only the acceleration response is recorded. In this paper an improved time domain method is proposed for dynamic load identification. In this method by using of Duhamel integral, only the acceleration response is required for load identification. As an application of the present method, the dynamic ice load on a Bohai offshore platform is identified based on some measured acceleration. The identified values of ice load are in good agreement with the measured ones. 相似文献
142.
Xue Hongchao Guo Da Pan Shaohua Zhong Hushui
Professors Hohai University Nanjing
Associate Professors Hohai University Nanjing 《中国海洋工程》1991,(1)
This paper gives an overall discussion about water level change on slopes under wave action, including wave runup, wave rundown and wave up-down amplitude, and a suggested formula for their calculation. 相似文献
143.
LOUISE HANSEN ACHIM BEYLICH VALENTIN BURKI† RAYMOND S. EILERTSEN‡ OLA FREDIN EILIV LARSEN ASTRID LYSÅ ATLE NESJE† KNUT STALSBERG JAN F. TØNNESEN Associate Editor – Nick Eyles 《Sedimentology》2009,56(6):1751-1773
The sediment fill of a silled bedrock valley in Western Norway has been investigated with respect to stratigraphy and infill history using a combination of mapping, georadar, seismic profiling and drilling. A small outlet glacier occupies the head of the valley that displays a stepwise down-valley profile and terminates in a lake at 29 m above sea-level. The valley is surrounded by high, steep bedrock slopes and is characterized by a series of filled basins each limited by sills of bedrock or moraine accumulations. Till, glacial outwash and/or rockslide deposits fill in the lower half of the two larger basins. (Fan) delta deposits fringed by the deposits of alluvial fans and colluvial cones dominate the upper fill of most basins. (Fan) delta deposits interfinger downstream with lake sediments in the larger basins and fluvial deposits comprise the top fill. The overall infill pattern was controlled by deglaciation as well as basin size and shape. An overall decreasing sediment supply following deglaciation is shown in the fill of a larger basin down-valley, whereas a recently increasing sediment supply during glacier growth is reflected primarily in an upstream basin. Only the lowermost basin was exposed to a sea-level drop from 75 m above sea-level to the present lake level associated with incision and river migration. This observation is in contrast to the basins above marine influence where incision has been limited due to fixed downstream sills resulting in insignificant erosion except for some fan-head entrenchment. It follows that the fills of these small valley basins display progradational and aggradational trends of deposition and paraglacial reworking has been limited. Additionally, the study demonstrates that georadar profiling, combined with other methods, is very useful for comprehensive investigation of valley basins. 相似文献
144.
Wang Deyu Chen Tieyun
Associate Professor Dept. of Naval Architecture Ocean Engineering Shanghai Jiaotong University Shanghai
Professor Dept. of Naval Architecture Ocean Engineering Shanghai Jiaotong University Shanghai 《中国海洋工程》1995,(1)
- The Bodner-Partom constitutive equation is used to study the viscoplastic torsional bucklingof perfect cylindrical shell. By treating the viscoplastic shell as an orthotropic shell at each moment and neglecting the inertia term, the critical torque is determined from a set of homogeneous linear equations. The strain rate sensitivity is mainly discussed in the present paper. 相似文献