کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1726262 1520743 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Drag forces caused by submarine glide block or out-runner block impact on suspended (free-span) pipelines
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
پیش نمایش صفحه اول مقاله
Drag forces caused by submarine glide block or out-runner block impact on suspended (free-span) pipelines
چکیده انگلیسی

The results of a series of physical experiments to quantify the drag force on a submarine pipeline caused by a glide block or an out-runner block impact normal to the pipe axis are presented. The experiments were conducted in a geotechnical centrifuge under submerged conditions at a centrifugal force of 30 times the Earth's gravity (i.e. N=30) and simulated impact situations under steady state conditions and uniform velocities. The soil blocks (approximately 4.5 m high in prototype terms) were made of kaolin clay with undrained shear strengths between 4 and 8 kPa. The model pipes were 6.35 and 9.52 mm in diameter (0.19 and 0.29 m in prototype terms). The impact velocities ranged between 0.04 and 1.3 m/s. The pipe centerline was at mid-height of the block. The shear strain rates, defined as the ratio of impact velocity to pipe diameter. The shear strain rates ranged from about 4 to 137 reciprocal seconds. Hence, the test results are applicable to a wide range of field situations. A method is presented for estimating glide or out-runner block impact drag force on submarine pipelines based on the results of the centrifuge experiments.


► Appendix A—discussing all centrifuge scaling laws relevant to the research.
► This is meant for a wide range of readers while provides necessary details.
► Inclusion of explanatory statements with the scaling consideration section to provide further clarity to the text.
► A thorough editorial review.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean Engineering - Volume 47, June 2012, Pages 50–57
نویسندگان
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