Extraction of feature spectra by instantaneous power spectrum and automatic generation of symptom parameters by GP for diagnosis of machinery in unsteady operating condition

2002 ◽  
Author(s):  
M. Taniguchi ◽  
Peng Chen ◽  
T. Toyota
Keyword(s):  
Power Spectrum ◽  
Automatic Generation ◽  
Operating Condition ◽  
Instantaneous Power

Instantaneous Power Spectrum*

2005 ◽  
Author(s):  
R.D. Hippenstiel ◽  
P.M. Oliveira
Keyword(s):  
Power Spectrum ◽  
Instantaneous Power

scholarly journals Gear Tooth Failure Detection by the Resonance Demodulation Technique and the Instantaneous Power Spectrum Method – A Comparative Study

2011 ◽  
Vol 18 (3) ◽  
pp. 503-523 ◽  
Author(s):  
Ahmad Ghasemloonia ◽  
Siamak Esmaeel Zadeh Khadem
Keyword(s):  
Power Spectrum ◽  
Gear Tooth ◽  
Angular Position ◽  
Failure Detection ◽  
Diagnostic Methods ◽  
Time Averaging ◽  
Instantaneous Power ◽  
Gearbox Vibration ◽  
Power Spectrum Method

The role of gears in industry for speed and torque variation purposes is obvious. The gearbox diagnostic methods have been improved quickly in recent years. In this paper, two of the newest methods, the resonance demodulation technique (R.D), and the instantaneous power spectrum technique (IPS) are applied to gearbox vibration signals and their capabilities in fault detection are compared. Yet, the important role of time averaging should not be dispensed with, as it is the primary step for both techniques. In the present study, the mathematical method of these techniques, according to the mathematical vibration model of gears, is introduced, these techniques are applied to the test rig data, and finally the results of both methods are compared. The results indicate that in each method, the location of fault can be estimated and it is located in the same angular position in both methods. The IPS method is applicable to severe faults, whereas the resonance demodulation technique is a simple tool to recognize the fault at each severity and at the early stages of fault generation.

The Formation of Simultaneous Radio Astronomical Images and Spectra by Electro-Optic Methods

1967 ◽  
Vol 1 (1) ◽  
pp. 33-34 ◽  
Author(s):  
D. J. McLean
Keyword(s):  
Power Spectrum ◽  
Radio Astronomy ◽  
Broad Band ◽  
Brightness Distribution ◽  
Electrical Signal ◽  
Optical Methods ◽  
Electrical Signals ◽  
Instantaneous Power ◽  
Electro Optic ◽  
Astronomical Images

This communication describes techniques, new to radio astronomy, which permit the analysis of electrical signals at radio-frequencies by optical methods.Two applications will be described: the first is to a spectrograph which gives the instantaneous power spectrum of a single broad-band electrical signal; the second is to the analysis of the signals from a number of aerials of an array in order to form a simultaneous image of the brightness distribution of the region of the sky under observation.

Sign in / Sign up

Export Citation Format

Share Document