نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار گروه مهندسی مکانیک بیوسیستم، دانشکده مهندسی زراعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، مازندران، ایران
2 استاد گروه مهندسی بیوسیستم دانشکده کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی
چکیده
در این تحقیق، نیروهای مقاوم افقی، عمودی و جانبی وارد بر زیرشکن کجساق در حالتهای تک شاخه و دو شاخه در چهار سرعت پیشروی 8/1، 3/2، 9/2 و 5/3 کیلومتر بر ساعت و در عمق ثابت40 سانتیمتر بررسی شد. آزمایشهای مزرعهای بر پایۀ طرح بلوکهای کاملاً تصادفی با چهار تکرار اجرا گردید. نیروهای افقی، عمودی و جانبی در هر آزمایش اندازهگیری و ثبت شدند. نتایج بررسیها نشان میدهد که با افزایش سرعت پیشروی از 8/1 به 5/3 کیلومتر برساعت، نیروهای مقاوم افقی، عمودی و جانبی به ترتیب در حالت تک شاخه به میزان 14، 5/3 و 1 درصد و در حالت دو شاخه به میزان 13، 2/1 و 5/11 درصد افزایش مییابند. همچنین، با مقایسۀ این نیروها مشخص شد که نیروی مقاوم افقی حالت دو شاخه بیش از دو برابر حالت تک شاخه، نیروی مقاوم عمودی بیشتر از حالت تک شاخه اما نه دو برابر آن و نیروی مقاوم جانبی حالت دو شاخه بسیار کمتر از نیروی مقاوم جانبی حالت تک شاخه است. در حالت کلی، توصیه میشود که با استفاده از دو شاخۀ توأم کجساق به جای انواع
تک شاخۀ آن، میزان نفوذ شاخهها را در خاک افزایش و نیروی جانبی را کاهش دهیم و تعادل جانبی مجموعه تراکتور- زیرشکن را بهبود بخشیم.
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