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61.
This paper analyzes the advantages and disadvantages of two techni-cal lines for automatic group generalization of contour lines.The author suggeststhat it is possible to get faster and better generalization results if we simulate theintelligence of human experts in program designing,retrieve geomorphologicalstructural information using the input data of 2-D contour lines and derive andoutput the generalied 2-D results directly. 相似文献
62.
Zhu Guangyu Lu Tongsheng Tang Nianci Zai Jinzhang . Senior Engineer Research Institute of the Third Navigation Engineering Bureau Ministry of Communications Shanghai
. Lecturer Dept. of Communications Transportation Engineering Southeast University Nanjing
. Professor Dept. of Communications Transportation Engineering Southeast University Nanjing
. Associate Professor 《中国海洋工程》1991,(4)
Field measurements of driving resistances and heights of soil core during driving were made offshore and onshore of steel pipe piles. Measured data show that the height of soil core varies differently for piles of different diameters with the increase of penetration. Dynamic plugging could be assumed never to occur for steel pipe piles with diameters over 900 mm. Soil resistances at the time of continuous driving (SRD) are back analyzed from blow counts with an empirical distribution of resistances suppported by many early dynamic measurements. A method of predicting SRD is finally suggested. 相似文献
63.
Dai Yishan He Wuzhou Professor Harbin Shipbuilding Engineering Institute Harbin
Associate Professor Harbin Shipbuilding Engineering Institute Harbin 《中国海洋工程》1993,(3)
- Generated by an ideal sinusoidal motion of the vertical plate, the simplest linear solution in time domain for two-dimensional regular waves is derived. The solution describes the propagation process of the plane progressive wave with a front, and will approach the linear steady- state solution as the oscillation time of the plate approaches infinity. The solution presented in this paper can be used to provide an incident wave model with analytical expression for solving the problems of diffraction and response of floating bodies in time domain. 相似文献
64.
Huang Guoliang Liu Tianwei Yan Naichang
Associate Professor Shanghai Jiao Tong University Shanghai
Engineer Shanghai Jiao Tong University Shanghai .
Professor Shanghai Jiao Tong University Shanghai 《中国海洋工程》1997,(4)
In this paper,the maneuvering characteristics of a low speed submersible are investigated.First,the captive model tests are carried out to obtain the hydrodynamic forces acting on the submersibleusing a Planar Motion Mechanism(PMM).For the hydrodynamic forces within a wide range of attack an-gles,the hydrodynamic coefficients which are usually used in the conventional maneuvering motion arequite difficult to be applied.In this case,a Fourier series is adopted to represent the hydrodynamic forcesand it fits the experimental data well.Then,based on the experimental results the simulation calculationsare made to predict some of the maneuvering performance of the low speed submersible. 相似文献
65.
Qian Lingxi Zhong Wanxie Zhang Hongwu Professor Dalian University of Technology Dalian
Associate Professor Dalian University of Technology Dalian 《中国海洋工程》1993,(1)
In this paper, the foundation soil of offshore structure is simulated as a two phase saturated porous medium. The dynamic equations of porous medium and finite element formulation are given. For structural analysis, the technique of multilevel substructure is used, and the saturated soil analysis is set in the highest level substructure model. Based on these theories a dynamic finite element analysis program DIASS for the analysis of interaction between two phase ocean soil foundation and platform structures has been developed. A numerical example is given here to illustrate the influence of the pore water in soil on the structural response of an ocean platform. 相似文献
66.
Wu Guiqiu Ji Zaihua Sun Xuexin Zhang Jiuzi Associate Professor First Institute of Oceanography State Oceanic Administration Qingdao Associate Professor 《中国海洋工程》1993,(1)
- Laboratory tests have been conducted on the basis of theoretical analysis of stability of armour Grate Plates with reference to 20 structures. Some empirical formulas of statility thickness of Grate Plates have been obtained in consideration of the effects of water depth in front of the structures and critical wave period. The test results have been compared with field data. 相似文献
67.
In this paper, the mechanism of the interaction between the breast wall of mound breakwater and waves is expounded, then some new views and the law of variation of horizontal and vertical wave pressure over the breast wall are put forward. The results of this study have been adopted in the Specifications of Fishery Harbour Breakwater by the Ministry of Agricultures. 相似文献
68.
Sun Jingshi Zhu Yiming
Research Professor Tianjin Research Institute of Water Transport Engineering Tianjin
Associate Professor Dalian Aquatic Product Institute Dalian 《中国海洋工程》1995,(1)
Through hydraulic model experiment and site investigation, this paper has derived a calculation formula of dry-laid stone armour layer thickness of rubble mound breakwaters for fishery harbours. The influences of the friction force between stone blocks and the variations of wave length or period and water depth are considered in the formula. The calculated results of several existing structures are in good agreement with field data. This formula is more practical than those ever published both at home and abroad, and has been adoptted by the technical standards of aquatic projects published by the Ministry of Agriculture of China. It is applicable for the calculation of dry-laid stone armour layer of breakwater for small- or medium-size harbours. 相似文献
69.
Zhu Liangsheng Sui Shifeng
Associate Professor South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou Professor South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 《中国海洋工程》1997,(3)
Some researches have been made in this aspect.In the method by Walton Jr.(1992),incidentwaves are supposed to be the overlapping result of M component waves with different frequencies whichmay take different directions,the direction of incident waves should be available in advance,but in fact thedirection of incident waves is not available.In our study,incident waves are supposed to be composed ofM overlapping component waves with different frequencies,and different frequencies have different direc-tions.Based on the irregular wave reflection theory,the calculation formulas of wave direction,complexamplitude of incident waves,and complex amplitude of reflected waves in surface which are composed ofcomponent waves are derived by means of discrete Fourier transform.Then,the frequency spectra of inci-dent waves and reflected waves and the reflection coefficient of waves with corresponding frequencies areobtained.Verification of the method and the calculation results from in-situ measured data indicate thatt 相似文献
70.
Li Chunzhu Cai Yi Wei Shoulin Associate Professor Ocean University of Qingdao. Qingdao Graduate Student Ocean University of Qingdao Qingdao 《中国海洋工程》1991,(4)
The hollow-pipe perforated breakwater is of low reflection. In this paper the functions of reflection coefficients of both regular and random waves are theoretically derived, based on the concept of linear superimposition of reflected and incident waves and with the total flow rate continuity of integral form instead of the non-continuity of the boundary condition, and based on the concept of linear wave spectrum theory. Comparisons between theoretical results presented here and measurements of model tests show reasonable agreement. 相似文献