Experimental investigation of structural linear and autoparametric interactions under random excitation

AIAA Journal ◽  
1990 ◽  
Vol 28 (2) ◽  
pp. 338-344 ◽  
Author(s):  
R. A. Ibrahim ◽  
D. G. Sullivan
Keyword(s):  
Experimental Investigation ◽  
Random Excitation

Experimental Investigation of Liquid Sloshing Under Parametric Random Excitation

1988 ◽  
Vol 55 (2) ◽  
pp. 467-473 ◽  
Author(s):  
R. A. Ibrahim ◽  
R. T. Heinrich
Keyword(s):  
Experimental Investigation ◽  
Time History ◽  
Response Characteristic ◽  
Random Excitation ◽  
Density Level ◽  
Closure Scheme ◽  
Sloshing Mode ◽  
Band Limited ◽  
Non Gaussian ◽  
Random Responses

This paper presents an experimental investigation of the random parametric excitation of a dynamic system with nonlinear inertia. The experimental model is a rigid circular tank partially filled with an incompressible inviscid liquid. The random responses of the first antisymmetric and symmetric sloshing modes are considered for band-limited random excitations. These include the means, mean squares, and probability density functions of each sloshing mode. The response of the liquid-free surface is found to be a stationary process for test durations exceeding ten minutes. The time-history response records reveal four response characteristic regimes. Each regime takes place within a certain range of excitation spectral density level. An evidence of the jump phenomenon, which was predicted theoretically by using the non-Gaussian closure scheme, is also reported. Comparisons with analytical results, derived by three different approaches, are given for the first antisymmetric sloshing mode.

scholarly journals Numerical simulation of a wind excited quasi-periodic regime of a stochastic van der Pol-type equation

2020 ◽  
Vol 313 ◽  
pp. 00044
Author(s):  
Cyril Fischer ◽  
Jiří Náprstek
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Type Equation ◽  
Random Excitation ◽  
Periodic Regime ◽  
Van Der Pol ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Configuration Parameter ◽  
Slender Structure

The contribution regards a mathematical single-degree-of-freedom model of a slender structure vibrating in an air flow. Based on an experimental investigation, movement of such structures can be expressed by van der PolDuffing-type equations. Several particular configuration parameter settings for a white and non-white Gaussian random excitation together with deterministic harmonic forcing are considered and numerically analysed. The results support recently published analytic formulas.

Determination of Fluid Damping Using Random Excitation

1985 ◽  
Vol 107 (2) ◽  
pp. 220-225 ◽  
Author(s):  
J. C. S. Yang ◽  
C. H. Marks ◽  
J. Jiang ◽  
D. Chen ◽  
A. Elahi ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Circular Cylinder ◽  
Random Excitation ◽  
Logarithmic Decrement ◽  
Random Decrement Technique ◽  
Damping Coefficients ◽  
Random Decrement ◽  
Fluid Damping ◽  
Random Decrement Method

An experimental investigation has been carried out to verify the validity of the use of the random decrement technique to determine the damping coefficients for a circular cylinder oscillating in water. Data are reported for amplitudes ranging from 0.4 diameters to 0.8 diameters, for water speeds from zero to 0.192 m/s (0.63 ft/sec), and for frequencies ranging from 0.37 Hz to 1.4 Hz. Comparison with other data, which has been reported in the literature or obtained by the authors, shows that the random decrement method yields comparable damping coefficients to those obtained using the logarithmic decrement technique for the range of variables in this experiment.

Experimental investigation of random excitation of nonlinear systems with autoparametric coupling

1989 ◽  
Vol 6 (2-4) ◽  
pp. 161-176 ◽  
Author(s):  
Raouf A. Ibrahim ◽  
Michael Evans ◽  
Yong-Joong Yoon
Keyword(s):  
Experimental Investigation ◽  
Nonlinear Systems ◽  
Random Excitation

Do moods and expectancies have unique or interactive effects?: An experimental investigation

2014 ◽  
Author(s):  
Shane Close ◽  
Victoria Adkins ◽  
Kandice Perry ◽  
Katheryn Eckles ◽  
Jill Brown ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Interactive Effects
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