This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Post-Processing Analysis of Large Channel Count Order Track Tests and Estimation of Linearly Independent Operating Shapes
Technical Paper
1999-01-1827
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Large channel count data acquisition systems have seen increasing use in the acquisition and analysis of rotating machinery, these systems have the ability to generate very large amounts of data for analysis. The most common operating measurement made on powertrains or automobiles on the road or on dynamometers has become the order track measurement. Order tracking analysis can generate a very large amount of information that must be analyzed, both due to the number of channels and orders tracked. Analysis methods to efficiently analyze large numbers of Frequency Response Function (FRF) measurements have been developed and used over the last 20 years in many troubleshooting applications. This paper develops applications for several FRF based analysis methods as applied for efficient analysis of large amounts of order track data. Post-processing analysis methods are developed to generate order track autopowers, track order track based operating shapes, and generate virtual measurements and operating shapes.
A virtual measurement is formulated that enhances and identifies where in a speed sweep a particular virtual operating shape is excited, this virtual measurement is referred to as a Mode Enhanced Order Track. An analysis technique is also developed which has the ability to estimate linearly independent operating shapes from a set of operating shapes excited by different orders, this technique is based on the CMIF parameter estimation used in modal analysis. The estimated linearly independent operating shapes are especially useful in trouble shooting applications where there are several components rotating at nearly the same speeds, as in the wheels of an automobile.
Examples of the use of these techniques are presented based on both analytical and experimentally acquired automotive data.
Recommended Content
Authors
Citation
Blough, J. and Gwaltney, G., "Post-Processing Analysis of Large Channel Count Order Track Tests and Estimation of Linearly Independent Operating Shapes," SAE Technical Paper 1999-01-1827, 1999, https://doi.org/10.4271/1999-01-1827.Also In
References
- Dossing, O. “Structural Stroboscopy-Measurement of Operational Deflection Shapes” Sound and Vibration Magazine 22 8 18 26 1988
- Otte, D. Van de Ponseele, P Leuridan, J. “Operational Deflection Shapes in Multisource Environments” Proceedings of Eighth International Modal Analysis Conference 1990 413 412
- Martin, M.W. “Modal Decomposition of Operating Data in a Multi-Source Environment” Master of Science Thesis, Michigan Technological University 1995
- Blough, J.R. Brown, D.L. Vold, H. “The Time Variant Discrete Fourier Transform as an Order Tracking Method” Proceedings of Society of Automotive Engineers 1997 Noise and Vibration Conference, SAE paper number 972006
- Blough, J.R. Brown, D.L. Vold, H. “Order Tracking with the Time Variant Discrete Fourier Transform” Proceedings of the International Seminar of Modal Analysis - 21 Leuven, Belgium 1996
- Vold, H. Mains, M. Blough, J.R. “Theoretical Foundations for High Performance Order Tracking with the Vold-Kalman Filter” Proceedings of Society of Automotive Engineers 1997 Noise and Vibration Conference, SAE paper number 972007
- Vold, H. Deel, J. “Vold-Kalman Order Tracking: New Methods for Vehicle Sound Quality and Drive-Train NVH Applications” Proceedings of Society of Automotive Engineers 1997 Noise and Vibration Conference, SAE paper number 972033
- Fladung, W.A “The Development and Implementation of Multiple Reference Impact Testing” Master of Science Thesis, University of Cincinnati 1994
- Blough, J.R. Brown, D.L. VanKarsen, C. “Independent Operating Shape Determination on Rotating Machinery, Based on Order Track Measurements” Proceedings of Sixteenth International Modal Analysis Conference 1998