Over the years, different kinds of tillage operations and implements have evolved in order to give the soil the best tilt for crop production. Tillage is an inevitable part of soil management and crop production. A good tillage
operation should provide a suitable soil pulverisation. Ridging is a tillage operation intended for heaping up of tilled soil from two sides to form long stripes of mounds having furrows in between. Mechanised ridging is always done after ploughing and harrowing operations(Nkakini et al.,2008). This tillage operation is accomplished with the aid of tillage implement called disc ridger. Until recently, one of the challenges in design of agricultural field tractor had been to equip it with a tractive device that can develop effective traction with minimum soil damage(Hassan and Broughton, 1975). Over time, the choice of tractive elements used for off-road vehicles to generate tractive force was mainly restricted to pneumatic tyres(Yu,2006).
A tractor pulling a tillage implement through the soil must overcome the draught force which is generated by the traction between the tyres and the soil surface. Tractive force plays a vital role in tillage operations, therefore the need to determined the appropriate tractive force model becomes necessary in order to balance the variables in operations. However, establishing the required tractive force is a complex phenomenon as evident from numerous efforts made to develop appropriate model that characterized the operations. Different modeling tools such as empirical, analytical and numerical analysis have been used over the years to model traction. However, there is still room for improvement. Hence, there is the need to improve on the efficiency of tillage operations to save time, money and increase productivity in mechanized agriculture. Researchers have shown that poor tractive performance in tillage operations is not cost effective. Optimizing the performance of agricultural tractors could, therefore help to minimize energy waste(Sefa and Kazim, 2004). Energy loss by the pneumatic tyre is therefore of concern to search for improved traction efficiency(Wong, 1993). This model determines the appropriate tractive force for tillage operations, which in turn gives the tractor operators proper condition for their fieldwork.
The objective of this study is to develop mathematical model for predicting the tractive force requirements of disc ridging using dimensional analysis and to validate the models by comparison of the computed results from model with field results.
ปี มีพัฒนาชนิด tillage การดำเนินงานและเครื่องมือต่าง ๆ เพื่อให้ดินความลาดเอียงที่ดีที่สุดสำหรับการผลิตพืช Tillage เป็นส่วนหลีกเลี่ยงไม่ได้ของการผลิตพืชและการจัดการดิน Tillage ดี การดำเนินการควรให้ pulverisation ดินที่เหมาะสม Ridging เป็นการดำเนินงาน tillage ไว้สำหรับ heaping ค่าของดิน tilled ขนาบแบบยาวลายของ mounds มี furrows ในระหว่าง Mechanised ridging เสมอแล้วหลังจากมงคล และ harrowing ดำเนินการ (Nkakini et al., 2008) การดำเนินการนี้ tillage สำเร็จ ด้วยความช่วยเหลือของ tillage ใช้เรียก ridger ดิสก์ จนเมื่อเร็ว ๆ นี้ หนึ่งในความท้าทายในการออกแบบของรถแทรกเตอร์เกษตรฟิลด์ได้ให้จัดให้ มีอุปกรณ์ tractive ที่สามารถพัฒนาลากมีผลบังคับใช้กับความเสียหายของดินต่ำ (Hassan และ Broughton, 1975) ช่วงเวลา มาย tractive องค์ประกอบที่ใช้ในการสร้างกองทัพ tractive สำหรับรถ off-road ได้ส่วนใหญ่จำกัด tyres(Yu,2006) นิวเมติกA tractor pulling a tillage implement through the soil must overcome the draught force which is generated by the traction between the tyres and the soil surface. Tractive force plays a vital role in tillage operations, therefore the need to determined the appropriate tractive force model becomes necessary in order to balance the variables in operations. However, establishing the required tractive force is a complex phenomenon as evident from numerous efforts made to develop appropriate model that characterized the operations. Different modeling tools such as empirical, analytical and numerical analysis have been used over the years to model traction. However, there is still room for improvement. Hence, there is the need to improve on the efficiency of tillage operations to save time, money and increase productivity in mechanized agriculture. Researchers have shown that poor tractive performance in tillage operations is not cost effective. Optimizing the performance of agricultural tractors could, therefore help to minimize energy waste(Sefa and Kazim, 2004). Energy loss by the pneumatic tyre is therefore of concern to search for improved traction efficiency(Wong, 1993). This model determines the appropriate tractive force for tillage operations, which in turn gives the tractor operators proper condition for their fieldwork.The objective of this study is to develop mathematical model for predicting the tractive force requirements of disc ridging using dimensional analysis and to validate the models by comparison of the computed results from model with field results.
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