تعیین کبودی گلابی در اثر بار ضربه‌ای با روش توموگرافی رایانه‌ای و ارتباط آن با مشخصه‌های فیزیکی گلابی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه علوم کشاورزی و منابع طبیعی گرگان

2 گروه مهندسی مکانیک بیو سیستم دانشگاه علوم کشاورزی و منابع طبیعی گرگان

چکیده

در این پژوهش با کمک آزمون غیر مخرب  توموگرافی رایانه‌ای به بررسی ارتباط بین مشخصه های فیزیکی گلابی در اثر نیروی بارگذاری دینامیکی و دوره انبارداری با مقدار کبودی پرداخته‌شده است. قبل از بارگذاری و انبارداری تعداد 45 گلابی با استفاده ازسی تی اسکن بررسی‌شده و تعداد 27 گلابی که درصد کبودی آن‌ها صفر بود انتخاب شدند و ابعاد گلابی‌ها (طول، عرض، ضخامت)  اندازه‌گیری شد و مشخصه‌های فیزیکی مانند قطر معادل، قطر میانگین هندسی ، ضریب کرویت، مساحت سطح رویه و ضریب رعنایی محاسبه گردید، سپس گلابی‌های انتخابی تحت بارگذاری دینامیکی با وزنه‌های به جرم 300 ، 350 و 400 گرم قرار گرفت و انبارداری 5 ،10 و 15 روزه برای بررسی تأثیر ضربه­های وارده بر گلابی‌ها انتخاب شد. سپس بعد از بارگذاری  و انبارداری با استفاده از سی­تی­اسکن در هر دوره از انبارداری میزان کبودی گلابی‌ها محاسبه گردید. نتایج آزمایش­ها نشان داد که بین قطر هندسی، حسابی و قطر معادل و نیز سطح رویه با درصد کبودی یک رابطه معکوس برقرار است. همچنین برای ضریب کرویت و رعنایی با درصد کبودی یک رابطه مستقیم و غیر معنی‌دار برقرار است. همچنین با توجه به نتایج  بدست آمده برای جرم وزنه‌های 300 گرم و کمتر از آن در دوره انبارداری 5 روزه زیاد یا کم بودن میزان قطر هندسی، حسابی و قطر معادل، ضریب کرویت و رعنایی بر روی درصد کبودی تأثیر خاصی نداشته است و تقریباً می‌توان درصد کبودی را صفر در نظر گرفت و با افزایش میزان جرم وزنه‌ها و دوره انبارداری میزان موارد فوق بر روی میزان درصد کبودی تأثیرگذار خواهد بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Determination of Pear Bruises Due to Impact Loading via Computed Tomography Scan Method and Relation Them with Physical Properties Pear

نویسندگان [English]

  • Mohsen Azadbakht 1
  • Mohammad Vahedi Torshizi 2
  • Mohammad Javad Mahmoodi 2
1 Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2 Department of Bio-system Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
چکیده [English]

In this research via CT scan, the relationship between physical properties of pears and storage times with bruise due to loading force was investigated. Before dynamic loading force and storing, 45 pears were examined using Scan CT and 27 pears with zero bruise percentage were selected  and dimensions of pears (length, width, thickness) were measured, then properties such as the equivalent diameter, geometric mean diameter, spherical coefficient, surface area and aspect ratio of calculus were calculated, next selected pears were subjected to dynamic loading with three  mass of weights 300, 350 and 400 g and  5, 10 and 15 days storage was used to investigate the effect of impact on pears. Then, after dynamic loading and storing, using the CT scan in each period of storage, the rate of pear bruise was calculated. The results of the experiments showed that there is an inverse relation between geometric diameter, arithmetic diameter, equivalent diameter and surface area with the bruise percentage. Also a direct and unreasonable relationship between the spherical coefficient and aspect ratio and the percentage of bruising was absorbed. Also, according to the results obtained for mass weighing 300 g or less in 5-day storage period, the amount of geometric diameter, arithmetic and equivalent diameter, spherical and aspect ratio on percentage of bruising were not significantly affected and percentage of bruising can be almost zero and with increasing amount mass weighing and storage, the above parameter's will affect the percentage of bruising.

کلیدواژه‌ها [English]

  • Pear
  • Computed Tomography Scan
  • Dynamic loading force
  • Physical properties
  • Bruise
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