Predicting the effects of the inter-row sweep wide and speed on the draft force and soil throw by using discrete element modeling

Yıl 2018, Cilt: 7 Sayı: 1, 34 - 41, 01.03.2018

Songul Gürsoy

Öz

Soil throws and draft force are important performance indicators of inter-row cultivators. These parameters of an inter-row cultivator were significantly affected by wide and speed of sweep. In this study, the Discrete Element Model DEM developed by using the parallel bond contact model PBCM of PFC3D was used to evaluate if the model could simulate the draft force and the soil throw distance of the inter-row sweeps at different width 150, 280, 330 mm and working speeds 0.75, 1.53, 2.22 m s-1 . The stiffness of soil particles used in DEM was calibrated as 3.0 x 103 N m-1 by comparing the simulated draft force of medium inter-row sweep at 1.53 m s-1 working speed with the experiment results in an indoor soil bin with a sandy loam soil. The calibrated model was then used to compare the simulated draft force and the soil throw distance of inter-row sweeps at different width and working speeds with experiment results under same condition. Results showed that the relative errors of the simulated draft force of sweeps at different working widths and speeds were less than 8%, which proved that DEM was an effective way to predict the draft force of sweeps. However, this developed model resulted in significantly lower soil throw distance than the measured value

Anahtar Kelimeler

Discrete element method, PFC3D, Soil-tool interaction, Inter-row sweep

Çapa kültivatöründe farklı uç demiri genişliği ve çalışma hızının çeki kuvveti gereksinimi ve toprağı atma mesafesine etkisinin ayrık elamanlar yöntemiyle tahmini

Öz

Toprağı atma mesafesi ve çeki kuvveti gereksinimi, sıra arası çapa makinalarının önemli performans göstergeleri arasında yer almaktadır. Kültivatör uç demiri genişliği ve çalışma hızı bu parametreleri önemli derecede etkilemektedir. Bu çalışmada, ayrık elemanlar yöntemiyle üç boyutlu modelleme yapan PFC3D Particle Flow Code in 3 Dimensions ’nin paralel bağlı kontak modelleme yöntemi kullanılarak geliştirilen modelin, farklı uç demiri genişliği 150, 280, 330 mm ve çalışma hızlarındaki sıra arası kültivatörlerinin toprağı atma mesafesi ve çeki kuvveti gereksinimlerini tahmin etmede kullanılabilirliği araştırılmıştır. Geliştirilen modelde kullanılan parçacıkların katılığı, 280 mm genişliğindeki üç demirinin 1.53 m s-1 çalışma hızında tahmin edilen çeki kuvveti değerlerinin, kumlu-tınlı bünyeli toprak kanalındaki deneme sonuçlarıyla karşılaştırılmasıyla 3.0 x 103 N m-1 olarak ayarlanmıştır. Ayarlanan model kullanılarak tahmin edilen farklı uç demiri genişliği ve çalışma hızlarındaki sıra arası çapa kültivatörlerinin çeki kuvveti gereksinimleri ve toprağı atma mesafeleri, toprak kanalındaki deneme sonuçlarıyla karşılaştırılarak modelin geçerliliği test edilmiştir. Karşılaştırmalar sonucunda, farklı uç demiri genişlikleri ve çalışma hızlarındaki çeki kuvveti gereksinimlerine ait tahmin ve deneme sonuçları arasındaki hata oranının %8’den daha az olduğu ve ayrık elemanlar modelleme yönteminin kültivatör uç demirlerinin çeki kuvveti gereksinimini tahmin etmede etkili bir şekilde kullanılabileceği görülmüştür. Fakat geliştirilen modelle tahmin edilen toprak atma mesafeleri, denemelerde ölçülen toprak atma mesafelerinden önemli derecede daha düşük olduğu gözlemlenmiştir

Anahtar Kelimeler

Ayrık elemanlar yöntemi, PFC3D, Toprak-alet etkileşimi, Çapa kültivatörü

Kaynakça

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