کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
874363 910335 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mathematical and empirical proof of principle for an on-body personal lift augmentation device (PLAD)
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی پزشکی
پیش نمایش صفحه اول مقاله
Mathematical and empirical proof of principle for an on-body personal lift augmentation device (PLAD)
چکیده انگلیسی

In our laboratory, we have developed a prototype of a personal lift augmentation device (PLAD) that can be worn by workers during manual handling tasks involving lifting or lowering or static holding in symmetric and asymmetric postures. Our concept was to develop a human-speed on-body assistive device that would reduce the required lumbar moment by 20–30% without negative consequences on other joints or lifting kinematics. This paper provides mathematical proof using simplified free body diagrams and two-dimensional moment balance equations. Empirical proof is also provided based on lifting trials with nine male subjects who executed sagittal plane lifts using three lifting styles (stoop, squat, free) and three different loads (5, 15, and 25 kg) under two conditions (PLAD, No-PLAD). Nine Fastrak sensors and six in-line strap force sensors were used to estimate the reduction of compressive and shear forces on L4/L5 as well as estimate the forces transferred to the shoulders and knees. Depending on lifting technique, the PLAD applied an added 23–36 N m of torque to assist the back muscles during lifting tasks. The peak pelvic girdle contact forces were estimated and their magnitudes ranged from 221.3±11.2 N for stoop lifting, 324.3±17.2 N for freestyle lifts to 468.47±23.2 N for squat lifting. The PLAD was able to reduce the compression and shear forces about 23–29% and 7.9–8.5%, respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Biomechanics - Volume 40, Issue 8, 2007, Pages 1694–1700
نویسندگان
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