با همکاری انجمن مهندسان مکانیک ایران

نوع مقاله : مقاله پژوهشی لاتین

نویسندگان

1 دانشگاه صنعتی اصفهان

2 دانشگاه شیراز

3 مؤسسه تحقیقات فنی و مهندسی کشاورزی

چکیده

در سراسر دنیا، کشاورزان وسایل مختلفی را برای خاک­ورزی انتخاب می­کنند که این به نوع محصول­، نوع خاک­، میزان باقی مانده گیاه از محصول قبلی و غیره بستگی دارد. انتخاب ابزار خاک­ورزی نیز تحت تأثیر در دسترس بودن ابزارآلات­، توان مصرفی، هزینه­های کارگری و سرمایه­­های موجود است. در این تحقیق، نیروی کششی، سطح مقطع به هم خوردگی خاک، شاخص مخروط خاک و مصرف سوخت در نظر گرفته شد. اثرات زاویه حمله، سرعت پیشروی و رطوبت خاک بر پارامترهای فوق الذکر بررسی شد. در این تحقیق، مقایسه‌ای بین عملکرد تیغه کامپوزیت پلیمر تقویت شده با الیاف (FRP) و تیغه فولادی معمولی انجام شد. آزمایش­ها بر اساس آزمایش کرت­های دو بار خرد شده بر پایه­ی طرح کاملاً تصادفی، انجام شد. عوامل رطوبت خاک، زاویه حمله و سرعت پیشروی در سه سطح گنجانده شد. سه سطح برای رطوبت خاک (3/9، 13، 7/16%)، زاویه حمله (20، 30، 40 درجه) و سرعت پیشروی (3، 5، 7 کیلومتر در ساعت) در نظر گرفته شد. تیغه کامپوزیت FRP (به طور متوسط در محدوده مورد نظر برای متغیرها) باعث کاهش نیروی کششی، مصرف سوخت و شاخص مخروط خاک به ترتیب 97/14%، 63/16% و 08/35% نسبت به تیغه فولادی شده است. همچنین، منطقه آشفتگی خاک ایجاد شده توسط تیغه کامپوزیت FRP، 93/4% بیشتر از تیغه فولادی بود. با توجه به نتایج این مطالعه، مشخص است که تیغه کامپوزیت FRP عملکرد بهتری نسبت به تیغه فولادی معمولی برای متغیرهای آزمون فوق دارد. با توجه به اینکه کامپوزیت FRP از فولاد ارزان­تر است، این امر منجر به صرفه جویی قابل توجهی در تولید تیغه کامپوزیت FRP مورد استفاده در گاوآهن چیزل و ابزارهای خاک‌ورزی مرکب می­شود که از نظر اقتصادی برای کشاورز و تولید کننده مقرون به صرفه است.

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