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RESEARCH PAPER
The influence of the friction phenomenon on a forest crane operator’s level of discomfort
 
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Department of Mechanical Engineering Fundamentals University of Bielsko-Biala Willowa 2, 43-309 Bielsko-Biala, Poland
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Department of Transport University of Bielsko-Biala Willowa 2, 43-309 Bielsko-Biala, Poland
Publication date: 2019-06-30
 
Eksploatacja i Niezawodność – Maintenance and Reliability 2019;21(2):197–210
 
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ABSTRACT
A mathematical model of a forest crane that is suitable for dynamics analysis of its operation cycle is presented in this paper. The flexibility of the operator’s seat, drives and supports is taken into account. Joint coordinates are applied to describe the motion of the links together with the homogeneous transformations technique. Lagrange equations of the second order are used when deriving the equations of motions. Joint forces and torques are determined based on recursive Newton-Euler algorithms. These joint forces are then used in the LuGre friction model, which allows to calculate the friction coefficients and friction forces. Numerical analyses performed here show the influence of various friction forces on the vibration level as perceived by the operator of the crane. The level of discomfort is discussed based on standards commonly used in the vehicle and transportation industry for evaluations of vibration comfort
 
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