ابداع و بهینه سازی یک مکانیزم جدید محرک سوزن در ماشین های دوخت با استفاده از الگوریتم ژنتیک

نویسندگان

دانشگاه یزد

چکیده

مسأله طراحی ماشین دوخت به دلیل وجود مکانیزم های پیچیده و جواب های طراحی متعدد، جزء مسائل مشکل به شمار می رود. بدون شک کیفیت دوخت در این ماشین ها تا حد زیادی متأثر از پارامترهای مکانیزم محرک سوزن است. با توجه به تأثیر سرعت سوزن در محدوده نفوذ در پارچه بر نیروی تماس و حرارت ایجاد شده در سوزن، استفاده از یک مکانیزم محرک بهینه از اهمیت ویژه ای برخوردار است. متأسفانه علی رغم اهمیت این موضوع از دید عملی، تحقیقات زیادی در این راستا صورت نگرفته است. لذا در این مقاله، ابتدا به معرفی یک مکانیزم جدید محرک سوزن پرداخته شده است. سپس، مراحل بهینه سازی آن برای دستیابی به سرعت بهینه سوزن با استفاده از روش تکاملی الگوریتم ژنتیک به تفصیل بیان گردیده است. در ادامه، با اصلاح تابع هدف، تغییرات شتاب سوزن (جرک سوزن) به منظور کاهش لرزش های نامطلوب و حرکت یکنواخت سوزن کمینه شده است. نتایج حاصل از این تحقیق در مقایسه با تحقیقات دیگر، مؤید دستیابی به سرعت و جرک بهینه سوزن با استفاده از این مکانیزم جدید می باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Optimization of a New-developed Needle Drive Mechanism in Sewing Machines using the Genetic Algorithm

چکیده [English]

The problem of designing sewing machines is known as a difficult task due to the existence of complex mechanisms and various solutions. The stitch quality in these machines is certainly most influenced by the effect of parameters of the needle drive mechanism. The needle heat generated during sewing process as well as the needle contact force are directly related to needle velocity in penetration zone which in turn depends on the needle driver mechanism of sewing machine. Unfortunately, despite the importance of this issue from practical point, very little publications have focused especially on the optimization of needle lever mechanism. Therefore, we first introduce a new needle derive mechanism for which an optimization procedure based on the genetic algorithm is followed to achieve minimum needle velocity during penetration. In addition, further modification of the objective function with respect to the variation of needle acceleration is applied to assure smooth movement of the needle during sewing process.

کلیدواژه‌ها [English]

  • needle velocity
  • sewing machine
  • Optimization
  • Genetic algorithm
  • slider-crank mechanism
 
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