نتایج جستجو برای: gmdh مقاوم
تعداد نتایج: 12328 فیلتر نتایج به سال:
In this study, silk fibroin was extracted from cocoons of silkworms and fabricated into nonwoven mats by electrospinning method. A new model based on the group method of data handling (GMDH) and artificial neural network (ANN) was developed for estimation of the average diameter of electrospun silk fibroin nanofibers. In this regard, concentration, flow rate, voltage, distance, and speed of col...
0957-4174/$ see front matter 2013 Elsevier Ltd. A http://dx.doi.org/10.1016/j.eswa.2013.01.060 ⇑ Tel.: +385 1 4561191. E-mail address: [email protected] The main disadvantage of self-organizing polynomial neural networks (SOPNN) automatically structured and trained by the group method of data handling (GMDH) algorithm is a partial optimization of model weights as the GMDH algorithm optimizes on...
This paper proposes a new passive robust fault detection scheme using non-linear models that include parameter uncertainty. The nonlinear model considered here is described by a group method of data handling (GMDH) neural network. The problem of passive robust fault detection using models including parameter uncertainty has been mainly addressed by checking if the measured behaviour is inside t...
This study concerns numerical simulation, modeling and optimization of aerodynamic stall control using a synthetic jet actuator. The numerical simulation was carried out by a large-eddy simulation that employs a RNG-based model as the subgrid-scale model. The flow around a NACA0015 airfoil, including a synthetic jet located at 10 % of the chord, is studied under Reynolds number Re = 12.7 × 10 a...
In this study, it was aimed to develop an accurate forecasting model for the monthly electricity demand of Turkey in medium-term. For purpose, Group Method Data Handling (GMDH)-type Neural Network (NN) approach used structure a nonlinear time-series based model. A large dataset containing considered period 2003-2018. The developed tested 2019/01-2019/11 order determine generalization ability te...
رابطه دبی- اشل در رودخانه یک پدیده بسیار پیچیده در علم هیدرولوژی می باشد که شناخت آن در مدیریت و برنامه ریزی منابع آب از اهمیت بسیار زیادی برخوردار است. مدل سازی این فرآیند می تواند ضریب اطمینان بالایی در طراحی سازه های هیدرولیکی، ساماندهی رودخانه ها و برنامه ریزی برای سیستم های هشدار سیل را ممکن نماید. جهت مدل سازی این فرآیند روش های مختلفی مانند روش های تجربی(منحنی دبی_ اشل)، روش های ریاضی و ...
Spur dikes are one of the common methods to protect rivers against erosion. Scouring around the spur dike is an important factor that can disorder the structural performance. Using protective spur dike is proper technique reduce the scour amount. In this research, the GMDH and GEP model used in order to evaluate and estimate the effect of various parameters of protective spur dike o...
انباشت موانع شناور جریان رودخانهها، نظیر تنه و شاخ و برگ درختان منجر به افزایش عمق آبشستگی موضعی در اطراف پایههای پل میشود. تاکنون جهت درک سازوکار پدیده آبشستگی تحت اثر موانع شناور، مطالعات آزمایشگاهی و میدانی بسیاری انجامشده است. در دو دههی اخیر از انواع روشهای هوش مصنوعی جهت تخمین بیشترین عمق آبشستگی در اطراف پایه پل استفادهشده است. در این مطالعه از مدل فازی-عصبی مبتنی بر روش دستهب...
Forecasting of oil prices has always been a matter of great importance due to its influence in driving a country’s economy. As a matter of fact, the petroleum industry is considered to be the biggest contributor in the industrial sector in terms of providing raw materials to the other industries and generating revenues. Due to the non-linear and unpredictable nature of the oil prices, a lot of ...
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