PREDICTION OF HEAT-TREATED CEDAR WOOD SWELLING AND SHRINKAGE VALUES WITH ARTIFICIAL NEURAL NETWORKS AND RANDOM FOREST ALGORITHM

Year 2020, , 200 - 205, 29.12.2020

Şemsettin Kılınçarslan , Yasemin Şimşek Türker , Murat İnce

https://doi.org/10.21923/jesd.825442

Cited By: 2

Abstract

Wood material is a natural, sustainable, renewable and environmentally friendly material that can be used in both structural and non-structural applications. However, one of the most important negative features of wood material is that it is a hygroscopic material. Heat treatment application increase dimensional stability of the wood material and becomes more hydrophobic. In this study, firstly, the contact angle values of Cedar wood have been determined in the tangential and radial direction by dropping them on the surface of the wood material. Then the swelling and shrinkage amounts of the same samples were determined. TS 4084 standard was used to determine the swelling and shrinkage amounts. As a result, shrinkage and swelling amounts of the samples were estimated by using artificial neural network (ANN) and Random Forest (RF) algorithm. In the estimation made by RF and ANN methods, contact angle values were used as input. It has been determined that the predictions made with RF Algorithm give the most accurate results (tangential direction, R2= 0.91, radial direction, R2= 0.97). As a result, it has been determined by RF Algorithm that shrinkage and swelling values of a wood material whose con-tact angle values are known can be better predicted.

Keywords

Heat Treatment, Cedar, Prediction, Artificial Neural Networks, Random Forest Algorithm

Thanks

This study was supported YÖK 100/2000 Doktorate Program and with FDK-2019-6950 ID by Suleyman Demirel University Scientific Research Projects. The authors would like to thank SDU-BAP for their support.

ISIL İŞLEM GÖRMÜŞ SEDİR ODUNU DARALMA VE GENİŞLEME DEĞERLERİNİN YAPAY SİNİR AĞLARI VE RASTGELE ORMAN ALGORİTMASI İLE TAHMİNİ

Abstract

Ahşap malzeme, hem yapısal hem de yapısal olmayan uygulamalarda kullanılabilen doğal, sürdürülebilir, yenilenebilir ve çevre dostu bir malzemedir. Ancak ahşap malzemenin en önemli olumsuz özelliklerinden biri higroskopik bir malzeme olmasıdır. Isıl işlem uygulaması ahşap malzemenin boyutsal stabilitesini arttırmakta ve daha hidrofobik hale getirmektedir. Bu çalışmada öncelikle, Sedir odununun temas açısı değerleri, ahşap malzeme yüzeyine damlatma ile teğet ve radyal yönde belirlenmiştir. Daha sonra aynı numunelerin genişleme ve daralma miktarları belirlenmiştir. Genişleme ve daralma miktarlarının belirlenmesinde TS 4084 standardı kullanılmıştır. Deneysel çalışma sonucunda, yapay sinir ağı (ANN) ve rastgele orman algoritması kullanılarak örneklerin daralma ve genişleme miktarları tahmin edilmiştir. Rastgele orman ve ANN yöntemleri ile yapılan tahminlerde temas açısı değerleri girdi olarak kullanılmıştır. Rastgele Orman Algoritması ile yapılan tahminlerin en doğru sonuçları verdiği tespit edilmiştir (teğet yön, R2= 0.91, radyal yön, R2= 0.97). Sonuç olarak, temas açısı değerleri bilinen bir ahşap malzemenin Rastgele Orman Algoritması ile daralma ve genişleme değerlerinin daha iyi tahmin edilebileceği belirlenmiştir.

Keywords

Isıl işlem, Sedir, Tahmin, Yapay Sinir Ağları, Rastgele Orman Algoritması

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