scholarly journals Calculus of the Power Spectral Density of Ultra Wide Band Pulse Position Modulation Signals Coded with Totally Flipped Code

2009 ◽  
Vol 9 (1) ◽  
pp. 16-21 ◽  
Author(s):  
T. N. DURNEA ◽  
N. D. ALEXANDRU
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Pulse Position Modulation ◽  
Power Spectral

Life Prediction and Damage Acceleration Based on the Power Spectral Density of Random Vibration

1995 ◽  
Vol 38 (1) ◽  
pp. 34-40
Author(s):  
Jimmy Hu
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Gaussian Processes ◽  
Life Prediction ◽  
Random Vibration ◽  
Wide Band ◽  
Accelerated Testing ◽  
Test Time ◽  
Element Analysis ◽  
Power Spectral

Fatigue life prediction and accelerated verification tests under a random vibration environment are important tasks for evaluating product reliability. This paper reviews the characteristics of random stress processes, discusses the methodology of life prediction and accelerated testing under various random loadings by using the stress power spectral density (PSD) function obtained from finite element analysis (FEA), and develops an engineering method to determine the acceleration level and test time in reliability verification tests. The discussions cover the narrow-band Gaussian processes, the wide-band Gaussian processes, and the nonGaussian processes. To illustrate the practical procedure of life prediction and accelerated testing based on the damage equivalent technique, the application example of an automotive component is presented.

Simple Method for Evaluation of Fatigue Damage of Structures in Wide-Band Random Vibrations

1994 ◽  
Vol 208 (1) ◽  
pp. 65-68 ◽  
Author(s):  
J J Kim ◽  
H Y Kim
Keyword(s):  
Spectral Density ◽  
Frequency Domain ◽  
Power Spectral Density ◽  
Fatigue Damage ◽  
Time Domain ◽  
Wide Band ◽  
Simple Method ◽  
Density Data ◽  
Power Spectral ◽  
The Time Domain

The note describes a simple method for evaluation of fatigue damage of structures in wide-band vibrations from response power spectral density data in the frequency domain. The method is applied to three sample cases and the results are compared with those of the damage calculation in the time domain.

Fuzzy Modeling of Multi-Degree-of-Freedom Power Spectral Density Systems

2009 ◽  
Vol 2 (1) ◽  
pp. 40-47
Author(s):  
Montasser Tahat ◽  
Hussien Al-Wedyan ◽  
Kudret Demirli ◽  
Saad Mutasher
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Fuzzy Modeling ◽  
Degree Of Freedom ◽  
Power Spectral
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