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2022, vol. 47, br. 4, str. 58-66
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Praktični model za procenu zapremine Taro Kokoyam na osnovu njegovih aksijalnih dimenzija
Practical model for estimating Taro Cocoyam volume based on its axial dimensions
aUniversity of Uyo, Faculty of Engineering, Department of Agricultural and Food Engineering, Uyo, Akwa Ibom State, Nigeria bMichael Okpara University of Agriculture, Department of Agricultural and Bioresources Engineering, Umudike, Abia State, Nigeria
e-adresa: assian4real@yahoo.com
Sažetak
Taro Cocoyam (Colocassia esculenta) plod je podložan napadima glodara, insekata i elemenata iz životne sredine . Nakon sušenja plod Taro Cocoyam, se čuva kako bi se izbegli gubici. U nastojanju da se efikasno razvije sistem skladištenja, osnovni fizički parametar kao što je zapremina svežeg ploda (zrna) Taro Cocoyam u odnosu na njegove aksijalne dimenzije treba da bude dobro izražena i modelovana zbog lake procene. U ovoj studiji, sveži uzorci zrna Taro Cocoiam su nabavljeni, očišćeni i upakovani. Za određivanje početnog sadržaja vlage (%) korišćeno je deset (10) neoljuštenih uzoraka. Aksijalne dimenzije pedeset (50) neoljuštenih uzoraka su izmerene i korišćene za izračunavanje srednjeg aritmetičkog prečnika (DA). Odgovarajuća stvarna zapremina (VT ) je određena korišćenjem postupka sušenja. Veliki uzorci su grupisani na osnovu pri (DA), u sedam (7) različitih veličina. Izračunate su srednja vrednost i standardna devijacija svakog parametra. Model je uspostavljen, verifikovan i validiran. Statistička analiza pokazuje da je vrednost koeficijenta determinacije (R2 ) skoro jednaka koeficijentu korelacije (r≈1). Vrednosti redukovanog hi-kvadrata testa (chc 2 ), srednje kvadratne greške (RMSE) i srednje greške pristrasnosti (MBE) nisu bile tako visoke. Vrednosti koeficijenta preostale mase (CRM) i efikasnost modeliranja (EF) bile su skoro savršene. Zato je uspostavljeni model praktično dobar za procenu zapremine ploda Taro Cocoiam i može da nađe uspešnu primenu kod projektovanja oblika rezervoara za hranu i sistema za skladištenje.
Abstract
Taro Cocoyam is prone to attack by rodents, insect pests and environmental elements. After drying, it is stored to evade wastage. In an effort to efficiently develop storage system, fundamental physical parameter such as volume of the fresh cocoyam with respect to its axial dimensions should be well expressed and modelled for easy estimation. In this study, fresh Taro Cocoyam samples were sourced, cleaned and packaged. Ten unpeeled samples were used in determining initial moisture content (% w.b). The axial dimensions of fifty unpeeled samples were measured and used to compute arithmetic mean diameter (DA). Corresponding true volume (VT) was found using water displacement approach. The bulk samples were grouped based on DA, into seven (7) size ranges. Mean and standard deviation of each parameter were computed. The model was established, verified and validated. Statistical analysis showed that the value of coefficient of determination (R2 ) was almost equals correlation coefficient (r ≈ 1). The values of reduced Chi-square (chc 2 ), root mean square error (RMSE) and mean bias error (MBE) were not that high. The values of coefficient of residual mass (CRM) and modelling efficiency (EF) were almost perfect. Therefore, the model established is practically good for estimating volume of Taro Cocoyam which could find application in the design of feed hopper and storage system.
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