We evaluated the influence of proprioceptive information about arm position on the perceptual localization of auditory and visual targets attached to the hand. Our approach was to distort the perceived position of the restrained arm by means of mechanical vibration of the biceps brachii muscle; such vibration elicits compelling apparent extension of the stationary forearm (Goodwin, G. M., D. I....

Abstract Objective To estimate the prevalence of hand-arm vibration (HAV) in Australian workplaces. Methods The Workplace Exposure Survey (AWES)—Hearing was a cross-sectional telephone survey workers conducted 2016–2017. Respondents were asked about time spent using tools or performing tasks known to be associated with HAV during their most recent working day. We created library magnitude level...

Several cases of exposure to hand-transmitted shocks in two different factories were studied with an intention to improve our knowledge about the influence of the impulsive components of vibration on human being. Two types of shocks affecting the workers could be distinguished, i.e., shocks having small amount of energy at frequencies higher than 100 Hz and shocks having relatively high frequen...

In this study, we consider a point-to-point motion of a flexible arm mounted on a flexible base, composed of a slide rail and helical extension springs, and then propose a trajectory planning method for reducing residual vibrations. The Lagrangian approach, in conjunction with the assumed mode method, is applied to derive the equations of motion of the system. In order to accurately construct t...

The transitory effects of hand vibration (ah, w = 3.16 m/s2 during three minutes) on postural vasomotor functions of skin capillary blood flow rate in the finger were studied by the local 133xenon washout technique in ten men with vibration induced white finger (VWF), nine men professionally exposed to hand-arm vibration but without finger symptoms (HAV), and eight male controls (MC). The follo...

OBJECTIVES To compare the noise and vibration levels associated with three hand-held rock drills (pneumatic, hydraulic and electric) currently used in South African mines, and a prototype acoustically shielded self-propelled rock drill. METHODS Equivalent A-weighted sound pressure levels were recorded on a geometrical grid, using Rion NL-11 and NL-14 sound level meters. Vibration measurements...