Analysis of rotating machines

a technology of rotating machines and analysis methods, applied in the direction of measuring wheels, distance measurements, instruments, etc., can solve the problems of discontinuities at the boundary of polynomial pieces or segments, difficult to derive meaningful information about order components, and traditional signal analysis methods such as the fourier transform of time domain input signals are not well suited to analyzing order components generated by rotating machines

Inactive Publication Date: 2004-09-23
NATIONAL INSTRUMENTS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The frequency smearing makes it very difficult to derive meaningful information about the order components.
Thus, traditional signal analysis methods such as the Fourier Transform of the time domain input signal are not well suited for analyzing order components generated by rotating machines.
However, this approach may result in discontinuities at boundaries of the polynomial pieces

Method used

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  • Analysis of rotating machines
  • Analysis of rotating machines
  • Analysis of rotating machines

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Embodiment Construction

[0078] FIGS. 6-7D illustrate a detailed embodiment of the above system and method. More specifically, FIGS. 6-7D illustrate hardware and software functionalities involved in the re-sampling process described above.

[0079] FIG. 6 is a process flow diagram for the method described above with reference to FIG. 3. FIGS. 7-7D illustrate various signals and corresponding time sequences used and generated by the process. FIG. 7 presents the illustrations of FIGS. 7A-7D together.

[0080] As FIG. 6 shows, in one embodiment, the analog tachometer signal 602 may be received and digitized by A / D converter 625A, resulting in discrete tachometer signal 603 as shown, and as further illustrated in FIGS. 7A and 7B, respectively. The discrete tachometer signal 603 may be analyzed, e.g., by edge detection software 627, to determine digital tachometer signal 604, shown in FIG. 7C, and resulting in time values for the tachometer signal pulses, i.e., equal angle time sequence 630, also shown in FIG. 7C. In ...

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Abstract

System and method for analyzing an input signal acquired from a physical system with a rotating element. A tachometer signal is received comprising rotation speed information for the rotating element. A time sequence is determined using the tachometer signal, comprising time values for the rotating element at substantially equal angle increments, e.g., by edge detection software or timer/counter. A software-based first digital interpolation filter, e.g., a Cascade-Integrator-Comb filter, is applied to the time sequence, generating a modified time sequence. A digitized data signal is received comprising data for the rotating element at substantially equal time increments. A second software-based digital interpolation filter is applied to the data signal, generating a modified data signal which is re-sampled using the modified time sequence to generate an angle domain data signal, comprising data signal values at substantially equal angle increments, where the angle domain data signal is usable to analyze the physical system.

Description

[0001] The invention relates generally to signal analysis systems or test and measurement systems, and more particularly to a computer-based system and method for analyzing order components of a signal generated by a physical system, e.g., a mechanical system containing one or more rotating elements.DESCRIPTION OF THE RELATED ART[0002] Scientists and engineers often use test and measurement systems and data acquisition systems to perform a variety of functions, including laboratory research, process monitoring and control, data logging, analytical chemistry, test and analysis of physical phenomena and analysis or control of mechanical or electrical machinery, to name a few examples. One example of hardware to implement such measuring systems is a computer-based measurement system or data acquisition (DAQ) system. Another example of a measurement system is a dedicated instrument, such as a dedicated oscilloscope or signal analyzer.[0003] A measurement system typically may include tra...

Claims

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Application Information

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IPC IPC(8): G01P3/489
CPCG01P3/489
Inventor JIN, WEIQIAN, SHIE
Owner NATIONAL INSTRUMENTS
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