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An automatic arc welding machine for saddle joint seams on large diameter cylinders
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作者 张忠厚 陈基勇 石运伟 《China Welding》 EI CAS 1999年第2期70-75,共6页
This paper deals with the structure, components, characteristics and work principle of a newly developed automatic arc welding machine for saddle joint seams on large diameter cylinders. The equations for designing th... This paper deals with the structure, components, characteristics and work principle of a newly developed automatic arc welding machine for saddle joint seams on large diameter cylinders. The equations for designing the geometry and dimensions of the cam controlling the moving locus of the welding torch have been derived. This welding machine has successfully been used in automatic welding saddle joint seams on boiler drums with good results and low cost. 展开更多
关键词 large diameter cylinders automatic arc welding machine saddle joint seam
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Experimental study on stability of sunken large diameter cylindrical structure on sandy seabed during construction period 被引量:1
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作者 秦崇仁 庞红犁 +1 位作者 李世森 张伟 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2002年第4期581-595,共15页
A systematic experimental research work is done for the stability of sunken large diameter cylinder during construction period. It is the first research that gives the method for assessing the stability of the larger ... A systematic experimental research work is done for the stability of sunken large diameter cylinder during construction period. It is the first research that gives the method for assessing the stability of the larger diameter cylindrical structure, a set of values is derived also for the critical stability indices of the large diameter cylinder sunken to the sandy seabed. 展开更多
关键词 Sunken large diameter cylinder sandy seabed stability during construction period assessing method critical stability index
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PREDICTION OF MAXIMUM SCOUR DEPTH AROUND LARGE DIAMETER CYLINDER UNDER THE EFFECTS OF BOTH WAVE AND CURRENT 被引量:2
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作者 LILin-pu CUILi 《Journal of Hydrodynamics》 SCIE EI CSCD 2005年第1期74-79,共6页
Physical model tests were counducted to predict local scour and maximum scour depth around the large diameter cylinders located in the (sand) seabed under the action of both wave and current . According to the result ... Physical model tests were counducted to predict local scour and maximum scour depth around the large diameter cylinders located in the (sand) seabed under the action of both wave and current . According to the result of tests, an analysis was made on all the factors influencing the scour. The results shows that for the seabed with relative fine grains in shallow water (0.07<h/L≤0.28),when the relative diameter D/L of the cylinder is within 0.3 0.7,the main effective scour factors around the cylinder in the seabed are diameter D of the cylinder, the wave height H, the wave length L, the velocity V c of the current and the parameters related to the seabed soil texture. The main parameters influecing the maximum scour depth were analyzed, and the test data were syntherized, to obtain the formula predicting the scour depth around the large diameter cylinder under the of both wave and current. 展开更多
关键词 offshore engineering the effects of both wave and current large diameter cylinder local scour
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