نتایج جستجو برای: vibration technique

تعداد نتایج: 658072  

In this work, analytical solutions are provided to the nonlinear equations arising in thermal and flow-induced vibration in fluid-conveying structures using Galerkin-differential transformation method with cosine aftertreatment technique. From the analysis, it was established that increase of the length and aspect ratio of the fluid-conveying structures result in decrease the nonlinear vibratio...

2012
Martin Alfuth Anne Beiring Dieter Klein Dieter Rosenbaum

Background Sensory receptors in the skin of the foot sole show a sitespecific sensitivity to local pressures and vibrations [1] and provide feedback during foot loading activities. Impaired plantar feedback has been shown to affect plantar pressures and kinematics during gait [2-5]. The present study investigated the acute effects of whole body vibration on plantar sensitivity and foot loading ...

Journal: :Physical review letters 2014
Pai Wang Filippo Casadei Sicong Shan James C Weaver Katia Bertoldi

We report a new class of tunable and switchable acoustic metamaterials comprising resonating units dispersed into an elastic matrix. Each resonator consists of a metallic core connected to the elastomeric matrix through elastic beams, whose buckling is intentionally exploited as a novel and effective approach to control the propagation of elastic waves. We first use numerical analysis to show t...

2010
Vinod R Challa M G Prasad Frank T Fisher

Future deployment of wireless sensor networks will ultimately require a self-sustainable local power source for each sensor, and vibration energy harvesting is a promising approach for such applications. A requirement for efficient vibration energy harvesting is to match the device and source frequencies. While techniques to tune the resonance frequency of an energy harvesting device have recen...

2014
Hao Wang Tianyou Tao Tong Guo Jian Li Aiqun Li

The structural health monitoring system (SHMS) provides an effective tool to conduct full-scale measurements on existing bridges for essential research on bridge wind engineering. In July 2008, Typhoon Fung-Wong lashed China and hit Sutong cable-stayed bridge (SCB) in China. During typhoon period, full-scale measurements were conducted to record the wind data and the structural vibration respon...

2013
GEOFFREY GELDHOF Seyed Milad Mousavi

Application of Magneto-Rheological (MR) dampers in semi-active vibration dynamics control of a multi-cart system is studied. The dynamics and vibration behaviour of a two cart system is investigated mathematically and an experimental test-rig is employed to verify the model, experimentally. The Bouc-Wen model is utilized to represent the mathematical behaviour of MR damper. Different types of s...

2010
V. Rouillard

This paper presents a novel technique by which non-Gaussian vibrations are synthesized by generating a sequence of random Gaussian processes of varying root-mean-square (rms) levels and durations. The technique makes use of previous research by the authors which shows that non-Gaussian vibrations from wheeled vehicles comprise of a sequence of Gaussian segments. Synthesis is achieved by creatin...

2005
Jorge Rodrigues

The random decrement (RD) technique is a time domain procedure, where the structural responses to operational loads are transformed into random decrement functions, which are proportional to the correlation functions of the system operational responses or can, equivalently, be considered as free vibration responses. This paper presents a general review on the application of the RD technique in ...

2017
Tobias Wollersheim Kurt Haas Stefan Wolf Knut Mai Claudia Spies Elisabeth Steinhagen-Thiessen Klaus-D Wernecke Joachim Spranger Steffen Weber-Carstens

BACKGROUND Intensive care unit (ICU)-acquired weakness in critically ill patients is a common and significant complication affecting the course of critical illness. Whole-body vibration is known to be effective muscle training and may be an option in diminishing weakness and muscle wasting. Especially, patients who are immobilized and not available for active physiotherapy may benefit. Until no...

Journal: :Critical Care 2007
R Phillip Dellinger Smith Jean Ismail Cinel Christina Tay Susmita Rajanala Yael A Glickman Joseph E Parrillo

INTRODUCTION There are several ventilator modes that are used for maintenance mechanical ventilation but no conclusive evidence that one mode of ventilation is better than another. Vibration response imaging is a novel bedside imaging technique that displays vibration energy of lung sounds generated during the respiratory cycle as a real-time structural and functional image of the respiration p...

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