یک مدل اجزای محدود برهم‌کنش کاوشگر تنش-خاک زیر یک چرخ صلب متحرک

ماشین های کشاورزی

مقاله 12، دوره 14، شماره 1 - شماره پیاپی 31، فروردین 1403، صفحه 49-67   

نوع مقاله: مقاله پژوهشی لاتین

شناسه دیجیتال (DOI): 10.22067/jam.2023.84158.1185

نویسندگان

مجتبی نادری بلداجی^{* 1}؛ هادی عظیمی نژادیان²؛ مصطفی بهرامی³

¹بخش مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد، ایران

²بخش مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه جهرم، جهرم، ایران

³دانش‌آموخته دکتری، بخش مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد، ایران

چکیده

تردد ماشین‌های کشاورزی با اعمال تنش بر سطح خاک دلیل اصلی تراکم خاک‌های کشاورزی است. مطالعه انتشار تنش در خاک نیاز به اندازه‌گیری تنش در خاک دارد، در حالی‌که تنش اندازه‌گیری‌شده با نصب هر نوع کاوشگر ممکن است با تنش واقعی خاک، یعنی تنش خاک در غیاب کاوشگر متفاوت باشد. این مطالعه با هدف شبیه‌سازی برهم‌کنش کاوشگر تنش در زیر یک چرخ صلب متحرک با استفاده از روش اجزای محدود به‌منظور بررسی تطابق تنش شبیه‌سازی‌شده با کاوشگر با تنش تجربی اندازه‌گیری‌شده در یک مخزن خاک انجام شد. خاک به‌عنوان یک ماده کشسان- خمیری مدل‌سازی و خواص آن با شبیه‌سازی نفوذ مخروط و نشست چرخ در خاک کالیبره شد. نتایج نشان داد که تنش به‌دست‌آمده از پروب با روش اجزای محدود به‌طور متوسط 28 درصد بیش‌تخمینی در مقایسه با تنش تجربی برای بارهای چرخ 600 و 1200 نیوتن داشته است. میانگین نسبت شبیه‌سازی‌شده تنش با کاوشگر به تنش بدون کاوشگر برای دو آزمون 1.22 به‌دست آمد که به‌طور معنی‌داری کوچک‌تر از همین نسبت تحت بارگذاری نشست صفحه دایره‌ای با مقدار 1.9 بود و همچنین به‌طور قابل‌توجهی بزرگ‌تر از نتیجه به‌به‌دست‌آمده از روش اجزای گسسته است. افزایش سرعت حرکت چرخ افزایشی جزئی در تنش خاک را نشان داد. نسبت بیش تخمینی تنش (همان نسبت تنش با کاوشگر به تنش بدون کاوشگر) به‌طور قابل‌توجهی با عمق افزایش یافت ولی افزایش کمی با سرعت در عمق زیر 0.2 متر داشت.

کلیدواژه‌ها

انباره خاک؛ تردد ماشین؛ تنش خاک؛ شبیه‌سازی اجزای محدود؛ کاوشگر تنش

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