دانلود مقاله Assessment of Free Spanning Pipelines Frequency and Vortex Induced Stress Ranges در word دارای 9 صفحه می باشد و دارای تنظیمات در microsoft word می باشد و آماده پرینت یا چاپ است
فایل ورد دانلود مقاله Assessment of Free Spanning Pipelines Frequency and Vortex Induced Stress Ranges در word کاملا فرمت بندی و تنظیم شده در استاندارد دانشگاه و مراکز دولتی می باشد.
این پروژه توسط مرکز مرکز پروژه های دانشجویی آماده و تنظیم شده است
توجه : در صورت مشاهده بهم ریختگی احتمالی در متون زیر ،دلیل ان کپی کردن این مطالب از داخل فایل ورد می باشد و در فایل اصلی دانلود مقاله Assessment of Free Spanning Pipelines Frequency and Vortex Induced Stress Ranges در word ،به هیچ وجه بهم ریختگی وجود ندارد
بخشی از متن دانلود مقاله Assessment of Free Spanning Pipelines Frequency and Vortex Induced Stress Ranges در word :
سال انتشار: 1391
محل انتشار: نهمین همایش بین المللی سواحل، بنادر و سازه های دریایی
تعداد صفحات: 9
نویسنده(ها):
Seyedeh Sara Salehyar – Master Degree , Main Author
Mohammad Reza Bahaari – PhD , supervisor
چکیده:
Offshore pipelines in their route pass through uneven sea beds. Free spans may be caused by seabed unevenness and changes of seabed topology such as scouring or sand waves. If dynamicforces be exerted on free spanning pipelines with frequency in the range of the free spanningpipe line frequency, free span will vibrate, and time varying stresses may cause fatigue. Themain source of dynamic stresses for subsea pipelines is the vibrations caused by vortex shedding.Inherently these vortices are shed periodically, therefore, the forces exerted by them on free spanning pipelines are cyclic, which can cause fatigue damage. In recent years, many studies have been done on free spanning pipelines (eg, [1], [2], [3], [4], [5]& [6]).In this paper, pipeline free spanning and its interaction with surrounding soil and fluid have been modeled in ABAQUS; the main difficulty in the modeling process is the interaction of the free span with sea water flow. This interaction has been modeled by a distributed, harmonic,amplitude dependent load, and the influence of different parameters including soil stiffness, hydrotest and operation conditions on the free spanning pipeline frequency and stress ranges in cross-flow direction have been assessed.
- ۹۵/۰۷/۱۷