Barış DEMİRBAY, Buse KARAKULLUKÇU, Fatma Gülay ACAR

Jelatin Çözeltilerinin Dinamik Viskozitesine Yapay Sinir Ağı (YSA) Yaklaşımı: Esnek Hesaplama Çalışması

Bu araştırmada, bir dizi ölçümden toplanmış deneysel veriyi kullanarak jelatin çözeltilerinin dinamik viskozitesini tahmin etmek üzere geliştirilen çok katmanlı ileri beslemeli bir yapay sinir ağı modeli (YSA) sunuyoruz. YSA yapısında, kayma gerilmesi, kayma oranı, mil torku, mil açısal hızı ile birlikte jelatin çözeltilerinin kütle konsantrasyonu giriş nöronları olarak tanıtılırken, jelatin çözeltilerinin dinamik viskozitesi tahmin edilmek üzere tek bir çıkış nöronu olarak kullanılmıştır. Geliştirilen YSA modeli, Bayesian regülasyonu ile optimize edilmiş geri yayılım algoritması kullanılarak eğitilmiştir. İlk olarak, en doğru performans sonuçlarını veren YSA yapısını bulmak üzere gizli katmanın optimal geometrik yapısı çalışılmıştır. Önerilen ağ modelleri için ortalama karesel hata (MSE), ortalama mutlak hata (MAE), ortalama kare hatalarının karekökü (RMSE), determinasyon katsayısı ($operatorname{?}^2$ ), varyans (VAF) ve regresyon analizleri performans değerlendirme parametreleri olarak kullanılmıştır. Geliştirilen YSA modelinin başarı performansını etkileyen en etkin giriş nöronunu araştırmak amacıyla duyarlılık analizi yapılmıştır. Sonuç olarak, gizli katmanda 8 nöronun kullanılması, önerilen diğer YSA modellerine kıyasla en düşük MSE ve en yüksek $operatorname{?}^2$ değerlerini vererek en yüksek başarı performansını göstermiştir. Duyarlılık analizinin sonucu olarak, kayma oranı oluşturulan sinir ağının başarı performansını etkileyen en etkin giriş nöronu olarak bulunmuştur. Tahmin edilen dinamik viskozite değerlerinin, ölçülen dinamik viskozite değerleriyle büyük bir uyum içinde olması, geliştirilen YSA modelinin doğruluğunu ve güvenilirliğini ispatlamıştır. Bu nedenle geliştirilen YSA modeli, bu araştırmada istatistiksel detayları verilen veri aralığındaki giriş ve çıkış parametrelerini kullanarak, polimer çözeltilerinin dinamik viskozitesini tahmin etmek için efektif bir kullanım sağlamaktadır.

Artificial Neural Network (ANN) Approach for Dynamic Viscosity of Aqueous Gelatin Solutions: A Soft Computing Study

In this research, we present a multi-layered feed-forward neural network (ANN) model developed for prediction of dynamic viscosityof aqueous gelatin solutions using experimental data collected from a number of measurements. In ANN architecture, shear stress, shearstrain, torque of spindle, the angular velocity of spindle together with mass concentrations of gelatin solutions were introduced as inputneurons, whereas dynamic viscosity of aqueous gelatin solutions was assigned as a single output neuron to be predicted. DevelopedANN model was trained using backpropagation algorithm optimized with Bayesian regulation. Optimal geometry of the hidden layerwas first studied to search out the ANN architecture which yields the most accurate performance results. Mean squared error (MSE),mean absolute error (MAE), root-mean-squared error (RMSE), determination of coefficient ($operatorname{?}^2$), the variance accounted for (VAF) andregression analyses were used as performance assessment parameters for suggested network models. Sensitivity analysis was carried out toinvestigate the most effective input neuron strongly influencing the performance of the developed ANN model. As a result, the use of 8 neuronsin the hidden layer has shown excellent performance results yielding the least MSE and the highest $operatorname{?}^2$ values compared to other suggestedANN models. Upon sensitivity analysis, the shear rate was found to be the most effective input neuron significantly affecting networkperformance. ANN-based predicted dynamic viscosity values were found to be in excellent agreement with measured viscosity values,demonstrating the robustness as well as the accuracy of the developed ANN model. Developed ANN model can, therefore, be effectivelyused to predict the dynamic viscosity of aqueous polymer solutions using the same input and output parameters in specific data rangereported in this paper with statistical details.

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