The joint symposium was held at the IIT Delhi on March 18-20, 1996, and focused on basic research issues and trends in the general area of vibration and noise engineering. Forty-two papers were selected for the three-day meeting on relevant topics including machine dynamics, diagnostics, vibro-acoustic analyses of structures and equipment, computational techniques, modal analysis, dynamic desig...

This work studies the dynamics of a 3D dimer bouncing upon a horizontal plate undergoing a vertical harmonic vibration. Despite complex interactions within the system due to impacts and friction, numerical simulation shows that, under certain conditions prescribed for the dynamics, the center of mass of the dimer, when projected onto a horizontal plane, will follow a circular orbit. The phenome...

PURPOSE We have shown that individuals with recurrent nonspecific low back pain (LBP) and healthy individuals breathing against an inspiratory load decrease their reliance on back proprioceptive signals in upright standing. Because individuals with LBP show greater susceptibility to diaphragm fatigue, it is reasonable to hypothesize that LBP, diaphragm dysfunction, and proprioceptive use may be...

The aim of this study was to investigate the relation between low back pain (LBP) outcomes and measures of daily exposure to whole-body vibration (WBV) in professional drivers. In a study population of 202 male drivers, who were not affected with LBP at the initial survey, LBP in terms of duration, intensity, and disability was investigated over a two-year follow-up period. Vibration measuremen...

In this study, two experiments were conducted to determine the point of subjective intensity equality (PSE) of pure tones and sinusoidal whole-body vibrations (WBV) at various frequencies (50Hz, 100Hz and 200Hz). In these experiments, sounds and vertical vibrations were simultaneously presented to subjects using circumaural headphones and a flat hard seat. In total, 10 participants were subject...

We investigated connections between the physiology of rat barrel cortex neurons and the sensation of vibration in humans. One set of experiments measured neuronal responses in anesthetized rats to trains of whisker deflections, each train characterized either by constant amplitude across all deflections or by variable amplitude ("amplitude noise"). Firing rate and firing synchrony were, on aver...

We performed an international trial with a newly developed multidimensional assessment protocol for substitution voices based on the European Laryngological Society protocol for ‘common dysphonia’. However, as sound production in SV is largely irregular, we needed some adaptations, in particular of the dimensions perception, acoustic analysis and visual evaluation. The protocol consisted of cli...

Vibratory stimulation applied to the chest wall during inspiration reduces the intensity of breathlessness, whereas the same stimulation during expiration has no effect or may increase breathlessness. The purpose of the present study was to determine whether vibration reduced the intensity of breathlessness during progressive hypercapnia with and without the addition of an external resistive lo...

Orthopedic components, such as the acetabular cup in total hip joint replacement, can be fabricated using porous metals, such as titanium, and a number of processes, such as selective laser melting. The issue of how to effectively remove loose powder from the pores (residual powder) of such components has not been addressed in the literature. In this work, we investigated the feasibility of two...