انجمن هیدرولیک ایران
نشریه هیدرولیک
2345-4237
5
1
2010
08
23
Multi Criteria Calibration of Pipelines under Unsteady Flows
واسنجی چندمعیاره خطوط لوله برای جریان های گذرا
71
80
85419
10.30482/jhyd.2010.85419
FA
علی
حقیقی
استادیار گروه عمران، دانشکده مهندسی، دانشگاه شهید چمران اهواز
Journal Article
2010
03
22
Partial differential equations of continuity and momentum govern the transient flows in pressurized<br />pipes. These equations are numerically analyzed using the method of characteristics that consists of<br />some important uncertainties such as friction loss modeling and wave speed. This work introduces a<br />calibration methodology to estimate precisely the uncertain parameters and, consequently, the<br />numerical modeling results. For this purpose, a transient state is generated by closing the downstream<br />end valve. A numerical model for transient analysis in the pipe is also developed. In that model, four<br />correction coefficients are considered to be calibrated including; pipe roughness, local and convective<br />accelerations in the unsteady friction loss model and wave speed. Afterward, a non linear<br />programming is developed in which the correction coefficients are decision variables. The objective<br />function is defined as the summation of squares of differences of the observed and calculated<br />pressures at the valve location. The problem is then solved using a simple genetic algorithm, and the<br />uncertainties are finally calibrated to the best conditions. The capability of the method is investigated<br />by solving a well-known experimental pipeline. The approach is found easy to use and results are<br />satisfactory.
http://jhyd.iha.ir/article_85419_1c0e53aec43d900111a92e1f0bda5279.pdf