نتایج جستجو برای: Mechanical Vibrations

تعداد نتایج: 250112  

دکتر فرشید رحیمی بشر, , دکترعلی بیک مرادی, , شراره کاظمی, , غلامحسین فلاحی نیا, ,

Introduction & Objective: passive respiratory exercises are used to prevent from accumulation of secretions, lung collapse and the incidence of ventilator-associated pneumonia in ICUs. This  study is aimed to compare the effects of manual percussion and mechanical vibrations on cardiopulmonary functions of mechanically ventilated patients. Materials &Methods: This randomized crossover clinical...

2014
Ajay K. Bhat Laura C. Fegely Sunil A. Bhave

We report guided-light opto-mechanical sensing of the mechanical vibrations of a toroidal-lipped SiO2 GOBLiT. An optical quality factor of 1.7x10 allowed us to measure mechanical vibrations of the GOBLiT with mechanical quality factor 206 in air for the n=2 degenerate wineglass mode. Light was coupled into the resonator via a tapered optical fiber and used to sense mechanical motion of the GOBL...

2007
El-Sayed Aziz Sven K. Esche

Mechanical vibrations represent an important subject in mechanical engineering. This paper describes a simulation-based online laboratory that was developed to assist students in understanding the concepts of mechanical vibrations in the context of practical engineering applications. This system was designed with a flexible multi-layered graphical user interface, and it can be used to illustrat...

2005
A. Palevičius

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...

1999
Robert Frey

The Department of Mechanical Engineering is one of four departments within the Thomas J. Watson School of Engineering and Applied Science at the State University of New York (SUNY) at Binghamton. The undergraduate educational experience emphasizes the application of a wide spectrum of engineering fundamentals. Care has been taken to ensure a balanced integration of theory, design and laboratory...

2010
Guilherme Sartori

This paper deals with the issue of mechanical vibrations in control of parallel robots. The proposed control strategy consists in a nonlinear adaptive dual mode controller applied to the actuation redundant parallel manipulator Par2. In this context, the experimental testbed is not equipped with velocity sensors. Therefore, a highgain observer has been used to estimate the articular velocities....

Journal: :Journal of Vibration and Acoustics 1985

Journal: :Circulation 1951
A L MESSER T B COUNIHAN M B RAPPAPORT H B SPRAGUE

Phonocardiography is-often more valuable than electrocardiography in timing mechanical events in the cardiac cycle. This study shows that the opening and closing of the mitral valve are related to the length of the previous heart cycle as demonstrated by the variations occuring in aluricular fibrillation. These variations in valve action are controlled by the pressure gradient between left auri...

2001
James B Thompson Barney Drake Johannes H Kindt Jessica Hoskins Paul K Hansma

We present a method for assessing an atomic force microscope’s (AFM’s) ability to reject externally applied vibrations. This method is demonstrated on one commercial and two prototype AFMs. For optimally functioning AFMs, we find that the response to externally applied vibrations obeys a 1/ω2 frequency dependence. This 1/ω2 frequency dependence can be understood by modelling the mechanical syst...

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