طراحی کنترلگر صندلی در مدل نیم خودرو برای حالت نشسته بدن انسان در وضعیت‌های مختلف ارتعاشی

نوع مقاله : گرایش دینامیک، ارتعاشات و کنترل

نویسندگان

1 استادیار، گروه مکانیک، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران

2 کارشناسی ارشد، گروه مکانیک، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران.

چکیده

رانندگان وسایل نقلیه در طول رانندگی به‌طور دائم در معرض ارتعاش تمام بدن قرار دارند که این مسئله ممکن است منجر به بروز اختلالات اسکلتی- عضلانی، عصبی، قلبی عروقی، گوارشی و بروز سایر بیماری­های شغلی ناشی از ارتعاش گردد. در این مقاله ابتدا معادلات سیستم دینامیکی غیر‌خطی بدن نشسته انسان بر روی مدل نیم خودرو به‌صورت تحلیلی بررسی می‌شود و معادلات با استفاده از سری تیلور خطی‌سازی می‌گردد. سپس معادلات به‌دست آمده در فضای حالت توسط نرم‌افزار متلب به شکل عددی تحلیل می‌شود و برای طراحی کنترل‌کننده چند‌متغیره از تحقق کانونیکال و تبدیلات همانند استفاده می­گردد. در نهایت با استفاده از الگوریتم ژنتیک، بهینه­سازی عملکرد کنترل‌کننده سیستم دینامیکی با هدف کاهش ارتعاشات وارد بر کل بدن انجام می‌گردد. بررسی نتایج نشان می‌دهد که با درنظر گرفتن برآیند دوجهت، میزان شتاب RMS وزنی در دو راستای افقی و عمودی از بدن انسان، بدون کنترلگر برابر با m/s2 76/2 است، با استفاده از کنترلگر به میزان m/s2 27/0 می‌رسد و با به‌کار بردن کنترل بهینه این میزان به m/s2 06/0 کاهش می‌یابد؛ که نشان می­دهد راهبرد کنترلی عملکرد قابل قبولی داشته و به‌خوبی موجب کاهش ارتعاشات وارد بر بدن شده است.

کلیدواژه‌ها


عنوان مقاله [English]

The Design of a Seat Controller for the Half Car Model in Various Vibrating Conditions Using the Seated Human Body Situation

نویسندگان [English]

  • Saeed Soheili 1
  • Hossein Delarami 2
1 Assistant Professor, Department of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran
2 MSc of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran.
چکیده [English]

A drivers’ body is continuously under various vibrations, resulting in different physical disorders such as muscle-skeletal defects, neurogenic diseases, cardiovascular problems, gastrointestinal disorders, etc. In this paper, firstly the nonlinear dynamic equations of a seated human body in the half car model are investigated analytically and linearized by means of the Taylor series. Then the obtained equations are analyzed numerically by the state-space method and employed for the design of multivariable controllers using the canonical and similar transformations. Finally, the controller performance of the system is optimized to suppress the transferred vibrations to the human body using the Genetic Algorithm (GA). The results show the RMS of human body acceleration in both the horizontal and vertical directions, to be 2.76m/s2 and 0.27m/s2, with and without the controller, respectively. It decreases to 0.06m/s2 with an optimized controller; which indicates that the controller acts satisfactorily and efficiently mitigates the human body vibrations.

کلیدواژه‌ها [English]

  • Seated Human body
  • Half car model
  • Canonical transformation
  • Genetic Algorithm
  • Random Road

Smiley face

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