This paper presents the results of laboratory experiment concerned with perception thresholds for whole-body vibration on recumbent subjects. Thresholds of subjects exposed to x-, yand z-axis sinusoidal vibration were determined for supine, prone, lying on the left side and lying on the right side subjects (from 1 to 80 Hz). It was clear that the threshold curves, as a function of frequency, ha...

A procedure for calculating the amplitudes of the normal and tangential components of the displacement vector of three-dimensional vibrations of any point on the surface of mechanical wave system is proposed on the basis of experimental holographic interfrometry data and the theory of vibrations of mechanical systems The problem of determination the amplitude – frequency response characteristic...

The main reason causing general stabilized hall vibration is the main mechanisms functioning, and periodic variation of hydrodynamic pressure force that strains the plating of the ship. This hydrodynamic pressure reaches maximum strain around the propellers zone. General vibration of the hall cause local vibrations of different parts of the ship since general vibrations causes movement of suppo...

Transverse Modal Vibrations of Vertical Tensioned Risers. A simplified Analytical Approach — The paper examines the physics of riser transverse modal vibrations of the type induced by VIV (Vortex Induced Vibrations). It presents a simplified analytical solution for such vibrations of vertical tensioned risers with uniform linear characteristics. The solution leads to simple expressions for the ...

3D reconstruction based on laser light projection is a well-known method that generally provides accurate results. However, when this method is used for inspection in uncontrolled environments, it is greatly affected by vibrations. This paper presents a structured-light sensor based on two laser stripes that provides a 3D reconstruction without vibrations. Using more than one laser stripe provi...

CVETANOVIC, B. and D. ZLATKOVIC, 2013. Evaluation of whole-body vibration risk in agricultural tractor drivers. Bulg. J. Agric. Sci., 19: 1155-1160 During their work, agricultural tractor drivers are exposed to various negative influences, among which vibrations are especially harmful. It is about vibrations generated in engine while the tractor is working, which are then transmitted to the dri...

Vibration tests are commonly used to design or qualify products such as electronics, auto parts, and consumer goods, and ensure they can withstand transportation and normal use or occasional vibration shocks. Many vibration tests specify random, sine, or classic shock vibration profiles. These produce vibrations from mathematically parameterized models and result in very predictive and consiste...

The motorcycle riders are subjected to extreme vibrations due to the vibrations of its engine, improper structural design of the motorcycle and the bad road conditions. The literature review reveals that the vibrations are most hazardous to the health if it exceeds the limit. The experiments were conducted to measure the magnitude of the vibrations acting on the rider during motorcycle riding u...

Mechanical vibrations of different products generate usually noise and additionally tactile information. In most cases, these auditory and tactile information are non-stationary signals. In the present study, a pilot psychophysical experiment was conducted to investigate the influence of non-stationary vibrations on the quality of non-stationary product sounds. In this experiment, non-stationar...

When sliding our fingertip against a textured surface, complex vibrations are produced in the skin. It is increasingly recognised that the neural transduction and processing of these vibrations plays an important role in the dynamic tactile perception of textures. The aim of the present study was to develop a novel means to tag the cortical activity related to the processing of these vibrations...