Biodynamic modeling and tests for operator arm&rsquo;s hand-transmitted vibration during using portable pneumatic extinguisher

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (19) : 38-44.

Biodynamic modeling and tests for operator arm’s hand-transmitted vibration during using portable pneumatic extinguisher

MA Wenkai1, LI Wenbin1, WEN Jian1, LI Weilin2

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Abstract

Here,in order to correctly predict effects of portable pneumatic extinguisher vibration on operator arm and reduce operator arm model’s complex level, according to theactual operation condition of portable pneumatic extinguisher, a biodynamic model with 5-DOF for operator arm’s hand-transmitted vibration was built considering his elbow in a posture of a curved arm of 90°. According to biodynamic characteristics of the arm system and its dynamic balance state in operation process, mechanical analysis was conducted to establish the mechanical equivalent model of the arm system, and then the standard vibration test platform was designed to identify parameters of the arm model and compare the model’s predicted vibration data with the actual measured values of portable pneumatic extinguishers.The results showed that under conditions of operator elbow in a posture of 90°, gripping force of 30 N and thrust one of 50 N, vibration response of the model isbetter consistent to the average measured value, the model can correctly fit the response feature curve of arm’s

hand-transmitted vibration; the model can be used to better predict operator’s arm vibration responses brought by operation of portable pneumatic extinguishers, and provide a quantitative theoretical prediction model for vibration risk evaluation.

Key words

portable pneumatic extinguisher / hand-transmitted vibration / biodynamic responses / ergonomics

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MA Wenkai1, LI Wenbin1, WEN Jian1, LI Weilin2. Biodynamic modeling and tests for operator arm’s hand-transmitted vibration during using portable pneumatic extinguisher[J]. Journal of Vibration and Shock, 2019, 38(19): 38-44

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