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یک مدل زمانبندی و برنامه ریزی پیشرفته تولید ( APPS ) دو سطحی برای تولید یک پارچه با بهره گیری از تکنولوژی RFID
معرفی
در دهه گذشته، بخش های تولیدی منافع مهمی در دستیابی به برنامه های کاربردی RFID (شناسایی فرکانس رادیویی) داشتند. در این زمینه، برای یکپارچه سازی برنامه ریزی تولید و زمانبندی که دستاوردی از هوش جمعی است انگیزه هایی بوجود آمد، از آن جمله: با استفاده از زمانبندی و برنامه ریزی پیشرفته (APPS) نهایی شده، مبتنی بر محیطی که با بهره گیری از زمان واقعی ( real-time ) برآمده از تکنولوژی RFID یکپارچه شده باشد، عملیات تولیدی موثر تر و سریع تر انجام می شود. در اینجا، APPS در تولید فروشگاهی ( shop floor manufacturing ) یکپارچه شده با زمان واقعی مبتنی بر تکنولوژی RFID، ویژگی های کلیدی دارد که با انواع سایت های تولیدی مورد مقایسه قرار خواهد گرفت.
اولاً، تصمیم گیری یک سلسله روش هایی را استفاده می کند که به 2 سطح تقسیم می شوند: 1. برنامه ریزی و 2. زمانبندی تولید. در سطح برنامه ریزی، سفارشات تولیدی تکرار می شوند تا اختلافات زمان تمام شده و موعد مقرر انجام کار را به حداقل برسانند. در سطح برنامه ریزی، مشاغل در یک توالی بهینه مشخص توصیف می شوند تا یک شغل به نحوی پردازش شود که یک ماشین یا اپراتور تاخیر کل را به حداقل برساند. از برنامه ریزی تا زمانبندی، یک سفارش تولیدی ممکن است به چند دسته تقسیم شود که هرکدام به عنوان یک کار در نظر گرفته شده و هریک حاوی 180 قطعه از اقلام م باشد.
دوماً، زمانبندی تولید از اصل فروشگاه جریان ترکیبی ( HFS ) پیروی می کند. در HFS، تعدادی ایستگاه وجود دارد که در هر یک از آنها تعدادی ماشین با وظایف مشابه قرار می گیرد. درون این ایستگاه ها، کارها بر اساس یک توالی دقیق پردازش می شوند. برخی از این ایستگاه ها ممکن است با توجه به نیازمندی های تکنیکی نا دیده گرفته شوند.
سوماً، مفهوم زمان واقعی استخر کار ( real-time job pool) نقش بسزایی در محیط یکپارچه شده با بهره گیری از تکنولوژی RFID دارد. دو مدل از استخر کار مورد استفاده قرار می گیرد. یکی برای سفارشات تولیدی در سطح برنامه ریزی، که زمان واقعی استخر کار مسولیت ایجاد توالی، مدیریت و انتشار سفارش تولید را بر عهده دارد؛ و دیگری برای هر ایستگاه در سطح زمانبندی، که مسولیت ایجاد توالی و انتشار کارها را بر اساس وقایع RFID ، به عهده دارد. یک واقعه RFID زمانی اتفاق می افتد که یک دستگاه ریدر یک تگ را که قبلا در فروشگاه تولید یکپارچه شده با تکنولوژی RFID ، تعریف شده باشد، تشخیص دهد.
چهارماً، قواعد بازی قابل توجهی در محیط تولید یکپارچه شده با تکنولوژی RFID نقش ایفا می کنند. در سطح برنامه ریزی، سفارشات تولید بر اساس 1. اولویتبندی، 2. اهمیت مشتری، 3. روش EDD ( اولین ورودی از نظر زمانی ) و 4. روش FIFO ( اولین ورودی از اولین خروجی ) در استخر کار توالی داده می شوند. در سطح زمانبندی، کارها بر اساس 1. گروه بندی بر مبنای مواد تشکیل دهنده، 2. SPT ( کوتاه ترین زمان پردازش ) و 3. بر مبنای سفارش در استخر کار توالی داده می شوند. بعلاوه، یک وظیفه زمانی به یک ماشین خاص از استخر کار تخصیص داده می شود که ممکن است بعضی از قواعد مانند ویژگی های مواد تشکیل دهنده و یا سرعت انجام کار توسط ماشین را شامل شود.
در نهایت، منابع تولیدی مانند ماشین آلات، مواد خام و کارگران مجهز به تجهیزات RFID می شوند. یک مرتبه با RFID محدود، آنها تبدیل به ( SMOs ) یا اشیائ تولیدی هوشمند می شوند که قادر به تشخیص، تعامل و رفتار بر اساس جریانات کاری تولیدی درون محیطی می باشند به نحوی که APPS از طریق RFID قطعاً صورت گیرد. تکنولوژی قادر است اطلاعات زمان واقعی را بلافاصله جمع آوری کند. بنابر این، اصل سلسله مراتب تصمیم گیری قدیمی درون یک حلقه بسته امروزی به روز رسانی می شود که اطلاعات زمان واقعی مانند وضعیت اپراتور، وضعیت ماشین آلات، پیشرفت کار و ورود مواد خام در سطح زمانبندی بتواند به سطح برنامه ریزی بازخورد داده شود.

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