Abstract
Rotary tiller commonly used effectively to process the soil before planting in a terrain area. The design of the blade in rotary tiller was a significant factor in achieving soil breakup and more efficient inversion evenmore soil-fertilizer mixing. The blades design for an unmanned tiller with omnidirectional movement was required intensive research. A prototype unmanned tiller was manufactured, and it has four screw wheel blade that required optimal design and high accuracy movement for soil processing application. In the present research, the design of the screw blade is investigated by mathematical and simulation method. The model was reverse engineering from commercial blades become screw-like blade wheel design. The calculation of the screw wheel design performance uses a mathematical approach identical to that of a screw conveyor and also it is supported by simulations to find the critical point of the structure and maximum defection in the screw wheel structure. Meanwhile, to study the lift-motion and moving of soil particles, simulations were carried out with variations in the depth of the screw blades on the ground surface, namely 20%, 40% and 50%. From the calculation result, the optimal rotational speed and power are found at the intersection point the percentage of soil depth and vortek efficiency, they are 350 rpm at 1.5 kW power.
Highlights
Rotary tiller commonly used effectively to process the soil before planting in a terrain area
The design of the blade in rotary tiller was a significant factor in achieving soil breakup
reverse engineering from commercial blades become screw-like blade wheel design
Summary
Rotavtor atau Minitraktor adalah mesin yang digunakan untuk membajak tanah dengan prinsip kerja memutar serangkaian bilah roda diatas permukaan tanah. Banyak peneliti mempelajari kebutuhan kekuatan dan kerja spesifik pada minitraktor rotary dalam kondisi tanah yang berbeda. Mekanika: Majalah Ilmiah Mekanika/Halaman 48 Volume 19 Nomor 1, Maret 2020 minitraktor rotary akan menghasilkan kebutuhan energi spesifik yang lebih baik. Seperti pada desain roda robotik terdapat unit mechanum atau roda omnidirectional (roda yang mampu bertindak sebagai sistem kemudi untuk berbelok ke segala arah) yang paling mendekati dengan studi kasus. Robot dengan kemampuan omnidirectional dengan mengunakan roda Mecanum secara luas digunakan di berbagai bidang industri karena memiliki fleksibilitas dan struktur yang sederhana dan akurasi gerakan yang baik. Pemilihan konfigurasi roda Mecanum menjadi faktor penting untuk dapat bergerak sebagai robot mobile omnidirectional tanpa sistem kemudi. Akan diteliti pula akurasi lintasan gerakan omnidirectional sehingga tidak dibutuhkan sistem kemudi pada prototipe minitraktor nirawak yang sedang dikembangkan
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