نوع مقاله : مقاله پژوهشی لاتین

نویسندگان

گروه مهندسی مواد و طراحی صنایع غذایی دانشگاه علوم کشاورزی و منابع طبیعی گرگان.

چکیده

در این پژوهش، پخت مرحله‌ای و کنترل‌کننده فازی دما طی پرتودهی مادون قرمز سیب با روش حرارت‌دهی متناوب طراحی شد. بدین منظور، فرآیند بلانچینگ خشک و آب‎زدایی هم‎‌زمان برش‌های سیب در سه دمای 70، 75 و 80 درجه سانتی‌گراد براساس سرعت آنزیم‌بری و حفظ ویتامین C مطالعه شد. کنترل‌کننده فازی دما با حلقه پسخور با مقایسه دو تابع انتقال مرتبه یک و مرتبه دو در نرم افزار MATLAB طراحی، شبیه‌سازی و اجرا گردید. کارایی شبیه‌سازی با استفاده از شاخص‌های انتگرال مربع خطا (ISE)، انتگرال قدر مطلق خطا (IAE) و انتگرال قدرمطلق خطا در زمان (ITAE) و خطای شرایط پایا (ess) بررسی شد. نتایج نشان داد که دمای 80 درجه سانتی‌گراد به‌مدت 15 دقیقه برای عملیات بلانچینگ و دمای 70 درجه سانتی‌گراد برای عملیات آب‌زدایی مناسب بود. نتایج شبیه‌سازی تأیید کرد که مرتبه بالاتر تابع انتقال موجب پاسخ سریع‌تر شد، اما افزایش نوسانات و کاهش پایداری مطلوب نبود. برای تابع انتقال مرتبه یک، شاخص‌های کارایی شامل (ISE)، (IAE) و (ITAE) به ترتیب 760/0، 821/0 و 589/0 برابر تابع انتقال مرتبه دو محاسبه شد. شبیه‌سازی نشان‌دهنده اعتبار مدل کنترل فازی بود و کارایی محاسباتی قابل‎قبولی نشان داد؛ زیرا آزمون قوانین فازی طی شبیه‌سازی حساسیت بالایی به حفظ خطای پایای (ess) نزدیک به صفر نشان داد.    

کلیدواژه‌ها

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