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	Provedor de dados CIGR Journal (2) Autor Nkakini, Silas Ovua (2) Douglas, I. E. (1) Palavra-chave Loamy (2) Sand (2) Sensitivity measurement (2) Soil (2) Soil moisture. (2) Tillage (2) Tractive force (2) Agricultural Engineering Modelling (1) Disc harrowing (1) Disc ridging (1) Modelling (1) Performance (1) Predictive (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2014 (1) 2013 (1) País China (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Prediction of tractive force model for disc harrowing using sensitivity analysis CIGR Journal Nkakini, Silas Ovua; Douglas, I. E.. In this study, a comparative evaluation of tractive force models for disc harrowing, at different tillage speeds was carried out in order to determine optimal tillage speeds.  The predictive models were developed using dimensional analysis.  The tillage operation in a loamy sand soil, at tillage speeds of 1.94 m s-1, 2.22 m s-1 and 2.5 m s-1 respectively was conducted, using trace tractor techniques.  Parameters such as drawbar pull, rolling resistance, wheel slip, moisture content, cone index, wheel numeric, contact pressure, speed, width of harrow, depth of harrow, and tractive force were measured.  The developed mathematical models describing the tractors tyre-soil interactions parameters were evaluated using sensitivity analysis of the measured... Tipo: Info:eu-repo/semantics/article Palavras-chave: Predictive; Tractive force; Disc harrowing; Tillage; Loamy; Sand; Soil; Modelling; Sensitivity measurement; Soil moisture.. Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2374 Performance evaluation of disc ridging tractive force model in loamy sand soil using sensitivity measured parameters CIGR Journal Nkakini, Silas Ovua. Abstract: Disc ridging operations in a loamy sand soil, at tillage speeds of 1.94 m/s, 2.22 m/s and 2.5 m/s, using trace tractor techniques, were conducted.  The dependent and independent variables involved in the models were measured.  The sensitivity of measured parameters was used for evaluating performance of developed models which described the tractors tyre-soil- interactions parameters.  Results showed performance of the wheel-tractors tractive force models having sensitivity coefficients ranging from -0.00164 to 0.2505, -0.00698 to 0.0979 and -0.00258 to 0.2595 for Disc ridging, with all the independent variables at 1.94 m/s, 2.22 m/s and 2.50 m/s tillage speeds respectively.  The lowest sensitivity coefficient of -0.00698 to 0.0979 was obtained at... Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural Engineering Modelling; Tractive force; Disc ridging; Performance; Tillage; Loamy; Sand; Soil; Sensitivity measurement; Soil moisture.. Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2781 Registros recuperados: 2 Primeira ... 1 ... Última

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