Volume displacement sensors for vibrating beams: Numerical approach

2004 ◽  
Vol 115 (5) ◽  
pp. 2526-2526
Author(s):  
Sai Prassad Jangiti ◽  
Marcellin Zahui
Keyword(s):  
Numerical Approach ◽  
Displacement Sensors ◽  
Vibrating Beams

Theoretical Development and Experimental Validation of Local Volume Displacement Sensors for a Vibrating Beam

2000 ◽  
Vol 123 (1) ◽  
pp. 110-118 ◽  
Author(s):  
Marcellin B. Zahui ◽  
James W. Kamman ◽  
Koorosh Naghshineh
Keyword(s):  
Boundary Conditions ◽  
Experimental Validation ◽  
Theoretical Development ◽  
Local Volume ◽  
Control Techniques ◽  
General Methodology ◽  
Displacement Sensors ◽  
Vibrating Beams ◽  
Further Development ◽  
Linear Shape

Further development of local volume displacement sensors is presented. This development supports the implementation of noise control techniques that are based on minimization of local volume displacements, velocities, or accelerations of a vibrating structure. In this paper, we present a general methodology for the development of local volume displacement sensors for vibrating beams using P_olyV_inyliD_ene F_luoride (PVDF). This methodology was verified experimentally for a clamped beam. The local volume displacement measured using a single PVDF sensor matched the local volume displacement found using multiple accelerometer measurements. The resulting sensors span the entire length of the beam. They have a quadratic shape over that portion of the beam whose volume displacement is desired, and they have a linear shape over all other sections. Sensor design issues for different beam boundary conditions are discussed along with a presentation of some sample sensor shapes for various beam segments and boundary conditions.

The Radiation of Sound from Mass-Loaded and Stiffened Beams

1985 ◽  
Vol 107 (1) ◽  
pp. 67-73 ◽  
Author(s):  
A. F. Seybert ◽  
P. J. Bowles
Keyword(s):  
Finite Element ◽  
Sound Radiation ◽  
Sound Field ◽  
Numerical Approach ◽  
Radiation Efficiency ◽  
Uniform Beam ◽  
Vibration Model ◽  
Vibrating Beams ◽  
Radiated Sound ◽  
Sound Radiation Efficiency

This study examines the sound radiation efficiency of uniform, mass-loaded, and stiffened beams. The radiation efficiency of vibrating beams is determined using a finite element vibration model of the beam and a numerical approach to determine the radiated sound field. The radiation efficiency of mass-loaded and stiffened beams deviates from that of the uniform beam for frequencies near and below coincidence. The radiation efficiency of the nonuniform beams depends on the change in natural frequency and the distortion of the mode shape of the vibrating beam. Near coincidence, the radiation efficiency of nonuniform beams approaches that of the uniform beam. Above coincidence, all beams exhibit a radiation efficiency of unity.

THERMAL MODELING OF ICE-PACKS IN COOLING VESTS FOR EXTREME HOT CLIMATIC CONDITION: A NUMERICAL APPROACH

2018 ◽  
Author(s):  
Vedant Bhuyar ◽  
Shiv Ram Suthar ◽  
Mohit Vijay ◽  
Prodyut R. Chakraborty
Keyword(s):  
Climatic Condition ◽  
Thermal Modeling ◽  
Numerical Approach

Thermal Convection in Rotating Spherical Shells: an Experimental and Numerical Approach within GeoFlow

2006 ◽  
Author(s):  
Mrs. Birgit Futterer ◽  
Dr. Marcus Gellert ◽  
Mr. Thomas von Larcher ◽  
Mr. Christoph Egbers
Keyword(s):  
Thermal Convection ◽  
Numerical Approach ◽  
Spherical Shells

A machine for real-time estimation of the tribological characteristics of materials

2020 ◽  
Vol 86 (4) ◽  
pp. 61-65
Author(s):  
M. V. Abramchuk ◽  
R. V. Pechenko ◽  
K. A. Nuzhdin ◽  
V. M. Musalimov
Keyword(s):  
Real Time ◽  
Time Estimation ◽  
Tribological Characteristics ◽  
Continuous Processing ◽  
Friction Machine ◽  
Dynamic Friction Coefficient ◽  
Displacement Sensors ◽  
Frictional Interaction ◽  
Real Time Estimation ◽  
Automated Quality Control

A reciprocating friction machine Tribal-T intended for automated quality control of the rubbing surfaces of tribopairs is described. The distinctive feature of the machine consists in implementation of the forced relative motion due to the frictional interaction of the rubbing surfaces fixed on the drive and conjugate platforms. Continuous processing of the signals from displacement sensors is carried out under conditions of continuous recording of mutual displacements of loaded tribopairs using classical approaches of the theory of automatic control to identify the tribological characteristics. The machine provides consistent visual real time monitoring of the parameters. The MATLAB based computer technologies are actively used in data processing. The calculated tribological characteristics of materials, i.e., the dynamic friction coefficient, damping coefficient and measure of the surface roughness, are presented. The tests revealed that a Tribal-T reciprocating friction machine is effective for real-time study of the aforementioned tribological characteristics of materials and can be used for monitoring of the condition of tribo-nodes of machines and mechanisms.

Sign in / Sign up

Export Citation Format

Share Document