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فصلنامه علمی کارافن

بررسی احتمال موفقیت انجام حرکت با استفاده از تخمین چگالی کرنل در راه‌رفتن انسان و مقایسه آن با معیار حاشیه پایداری

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان
1 دانش آموخته دکتری، دانشکده مهندسی، دانشگاه شهید چمران اهواز، اهواز، ایران.
2 استادیار، گروه مهندسی مکانیک، دانشگاه فنی و حرفه ای، تهران، ایران.
چکیده
در مطالعات با رویکرد کمّی مربوط به حفظ تعادل انسان و موفقیت انجام یک حرکت، دانستن اینکه مقدار پایداری از نظر عددی در یک وضعیت بدن یا هر لحظه در طول یک مسیر حرکت چقدر است، ضروری می‌باشد. به‌منظور بهبود معیارهای پایداری موجود، با درنظرگرفتن اینکه ممکن است همیشه شخص در معرض ضربه نباشد ولی نوساناتی کوچک در هنگام راه‌رفتن در شخص رخ بدهد، در این پژوهش به معرفی یک معیار جدید پرداخته شده است. این معیار کمّی جدید برای بیان میزان پایداری وضعیت در طول سیکل راه‌رفتن پیشنهاد شده است که احتمال موفقیت اجرای حرکت نامیده شده است. مبنای این معیار کمّی احتمال انجام موفق حرکت در فاز پرواز بدون شروع فرایند زمین‌خوردن بر اساس تخمین چگالی کرنل است. در این پژوهش، مسئله احتمال موفقیت اجرای حرکت برای یک جمعیت نمونه و با استفاده از یک پایگاه داده و یک تکنیک ضبط حرکتی برای ثبت اطلاعات سینماتیکی سیکل راه‌رفتن محاسبه شده است و بر روی یک مدل هفت عضوی مدل‌سازی شده است و نتایج به‌دست‌آمده با معیار پرکاربرد حاشیه پایداری مقایسه گردیده است. نتایج این تحقیق نشان می‌دهند که در مسیرهایی که هر فردی قادر به حفظ پایداری می‌باشد معیار حاشیه پایداری عدد کوچکی را برای پایداری تخمین می‌زند در حالی که عدد به‌دست‌آمده از معیار احتمال موفقیت اجرای حرکت در آنها بالا می‌باشد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Evaluation of the Probability of Motion Realization by Kernel Density Estimation Method in Human Walking and Comparing it with the Criterion of Margin of Stability

نویسندگان English

Mahdie Termeh 1
Abolfazl Zare-Shahabadi 2
1 PhD, Graduated, Faculty of Engineering, Shahid Chamran University, Ahwaz, Iran.
2 Assistant Professor, Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.
چکیده English

In studies with a quantitative approach to human walking stability, it is essential to quantitatively know how good the balance is at a body posture or every moment along a path. To predict and maintain a stable situation, it is necessary to develop a method that can measure stability and indicate the condition of dynamic balance along the path. In this paper, a new measure of postural stability was presented called the probability of motion realization based on the kernel density estimation, which assigns a value to the body motion based on the avoidance of a fall along a path. The issue of balance maintenance was examined for a population sample using a database and a motion capture technique for recording kinematic information of the gait cycle, and the probability of successful balance maintenance was calculated for the population. In addition, the probability of motion realization was calculated through a seven-link body model in all states for three age groups of men and women at different step lengths. The results were compared to the margin of stability, which is a conventional metric. The findings demonstrated that the margin of stability may be very low for a path on which most people can maintain their stability easily, whereas the probability of motion realization is high.

کلیدواژه‌ها English

Kernel Density Estimation Probability of Dynamic Success Human Walking Stability Single
support Phase Gait Cycle
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دوره 21، شماره 3
فنی و مهندسی
پاییز 1403
صفحه 209-229

  • تاریخ دریافت 06 فروردین 1403
  • تاریخ بازنگری 24 خرداد 1403
  • تاریخ پذیرش 24 مرداد 1403