scholarly journals Identification of source velocities on 3D structures in non-anechoic environments: Theoretical background and experimental validation of the inverse patch transfer functions method

2010 ◽  
Vol 329 (18) ◽  
pp. 3691-3708 ◽  
Author(s):  
M. Aucejo ◽  
N. Totaro ◽  
J.-L. Guyader
Keyword(s):  
Experimental Validation ◽  
Transfer Functions ◽  
Theoretical Background ◽  
3D Structures

scholarly journals Inverse Patch Transfer Functions Method as a Tool for Source Field Identification

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Dorian Vigoureux ◽  
Nicolas Totaro ◽  
Jonathan Lagneaux ◽  
Jean-Louis Guyader
Keyword(s):  
Background Noise ◽  
Experimental Validation ◽  
Transfer Functions ◽  
Near Field ◽  
Theoretical Background ◽  
Wall Pressure ◽  
Additional Measurement ◽  
Field Identification ◽  
Open Issue ◽  
Source Velocity

Many methods to detect, quantify, or reconstruct acoustic sources exist in the literature and are widely used in industry (near-field acoustic holography, inverse boundary element method, etc.). However, the source identification in a reverberant or nonanechoic environment on an irregularly shaped structure is still an open issue. In this context, the inverse patch transfer functions (iPTF) method first introduced by Aucejo et al. (2010, “Identification of Source Velocities on 3D Structures in Non-Anechoic Environments: Theoretical Background and Experimental Validation of the Inverse Patch Transfer Functions Method,” J. Sound Vib., 329(18), pp. 3691–3708) can be a suitable method. Indeed, the iPTF method has been developed to identify source velocity on complex geometries and in a nonanechoic environment. However, to obtain good results, the application of the method must follow rigorous criteria that were not fully investigated yet. In addition, as it was first defined, the iPTF method only provides source velocity while wall pressure or intensity should also give useful information to engineers. In the present article, a procedure to identify wall pressure and intensity of the source without any additional measurement is proposed. This procedure only needs simple numerical postprocessing. Using this new intensity identification, the influence of background noise, evanescent waves, and mesh discretization are illustrated on numerical examples. Finally, an experiment on a vibrating plate is shown to illustrate the iPTF procedure.

Theoretical background of defocus image modulation processing (DIMP) based on three dimensional optical transfer functions (3D-OTFs)

Optik ◽  
2001 ◽  
Vol 112 (2) ◽  
pp. 67-75 ◽  
Author(s):  
Hidetoshi Utsuro ◽  
Toshiyuki Ando ◽  
Yoshizo Takai ◽  
Ryuichi Shimizu ◽  
Takashi Ikuta
Keyword(s):  
Transfer Functions ◽  
Three Dimensional ◽  
Theoretical Background ◽  
Optical Transfer

A new automatic phase mask filter for high-resolution brain venography at 3 T: theoretical background and experimental validation

2010 ◽  
Vol 28 (4) ◽  
pp. 511-519 ◽  
Author(s):  
Sergio Casciaro ◽  
Roberto Bianco ◽  
Roberto Franchini ◽  
Ernesto Casciaro ◽  
Francesco Conversano
Keyword(s):  
High Resolution ◽  
Experimental Validation ◽  
Theoretical Background ◽  
Phase Mask ◽  
Automatic Phase

scholarly journals Effects of Tyre Pressure on Vehicle Suspension Performance

2015 ◽  
Vol 55 ◽  
pp. 102-111 ◽  
Author(s):  
M. Hamed ◽  
B. Tesfa ◽  
F. Gu ◽  
A.D. Ball
Keyword(s):  
Simulation Study ◽  
Experimental Validation ◽  
Transfer Functions ◽  
Ride Comfort ◽  
Fuel Efficiency ◽  
Vehicle Suspension ◽  
Vehicle Handling ◽  
Parameter Variations ◽  
Standard Pressure ◽  
Suspension Performance

Incorrect inflation pressures in tyres affects the vehicle handling, passenger comfort and braking conditions in addition to causing a reduction in fuel efficiency and tyre life. To address this problem, mathematical models have been produced and an experimental validation has been carried out. The models were developed with 7-DOF, for a full car system, using MATLAB programs. In the simulation study, the suspension faults have been considered by running the models with a range of inflation pressures at four conditions i.e. at standard pressure (2.3bar) and 1.5bar on the passenger wheel, driver wheel and front wheels. In each case, an analysis was carried out on the performances of the suspension in terms of ride comfort, road handling and stability of the vehicle followed by the presentation of the results obtained. In addition, the influence of parameter variations on transfer functions as a fault detection of suspension has been introduced. This approach has been used when detecting faults of vehicle tyres being under-inflated 35% and also to detect other suspension faults in the future.

scholarly journals Boundary control of a Rijke Tube using irrational transfer functions with experimental validation

2017 ◽  
Vol 50 (1) ◽  
pp. 4528-4533 ◽  
Author(s):  
Gustavo A. de Andrade ◽  
Rafael Vazquez ◽  
Daniel J. Pagano
Keyword(s):  
Boundary Control ◽  
Experimental Validation ◽  
Transfer Functions ◽  
Rijke Tube

scholarly journals Spontaneous buckling of thin-walled injection-molded parts

Mechanik ◽  
2019 ◽  
Vol 92 (1) ◽  
pp. 7-9
Author(s):  
Przemysław Poszwa ◽  
Paweł Brzęk ◽  
Wiktor Hoffmann
Keyword(s):  
Numerical Simulation ◽  
Experimental Validation ◽  
Industrial Applications ◽  
Theoretical Background ◽  
Wide Range ◽  
Molded Parts ◽  
Injection Molded ◽  
Thin Walled ◽  
Plastic Parts ◽  
Injection Molded Plastic

Injection molding technology has a wide range of industrial applications, especially in packaging and casing production. In this paper the spontaneous buckling of thin-walled injection molded plastic parts was described. Theoretical background along with numerical simulation and experimental validation of this phenomenon were presented.

Vibration Forces Produced by Waviness of the Rolling Surfaces of Thrust Loaded Ball Bearings Part 2: Experimental Validation

1988 ◽  
Vol 202 (5) ◽  
pp. 313-319 ◽  
Author(s):  
F P Wardle
Keyword(s):  
Experimental Validation ◽  
Ball Bearing ◽  
Transfer Functions ◽  
Ball Bearings ◽  
Vibration Measurements ◽  
Theoretical Predictions ◽  
Theory And Experiment

Experimental vibration measurements of a system containing a single ball bearing are compared with theoretical predictions based upon the model described in Part 1 and measurements of system transfer functions. Agreement between theory and experiment is reasonable.

Sign in / Sign up

Export Citation Format

Share Document