Virtual Sensing (VS) is considered to be an extension for feedforward Active Noise and Vibration Control (ANVC) systems when, for example, it is desired to minimize the response at one or more spatial locations where it is either physically impossible or undesirable to place an actual error sensor. In this context, VS is an estimation technique for predicting the appropriate system response using available measurements and a dynamic system model. A hybrid adaptive feedforward observer is proposed which has the ability to overcome the limitations of conventional dynamic observer designs. The hybrid observer utilizes a conventional dynamic observer augmented with an adaptive feedforward element for estimating the effect of the persistent disturbance. For simplicity, we restrict this development to a single tonal disturbance for which a coherent reference is assumed available. It will be appreciated that this technique may be extended to handle disturbances that contain multiple tones as well as broadband noise, as long as suitable reference signals are available. Numerical simulations and real-time experiments were performed on a one-dimensional acoustic duct. The results demonstrate that the hybrid adaptive feedforward observer is an effective method for predicting the virtual sensor response in an ANVC system.
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March 2002
Technical Papers
A Virtual Sensing Method for Tonal ANVC Systems
Chau M. Tran,
Chau M. Tran
Mechanical & Aerospace Engineering Department, North Carolina State University, Box 7910/3211 Broughton Hall, Raleigh, NC 27695
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Steve C. Southward
Steve C. Southward
Thomas Lord Research Center, Lord Corporation, Cary, NC 27511
Search for other works by this author on:
Chau M. Tran
Mechanical & Aerospace Engineering Department, North Carolina State University, Box 7910/3211 Broughton Hall, Raleigh, NC 27695
Steve C. Southward
Thomas Lord Research Center, Lord Corporation, Cary, NC 27511
Contributed by the Dynamic Systems and Control Division for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received by the Dynamic Systems and Control Division June 26, 2001. Associate Editor: C. Rahn
J. Dyn. Sys., Meas., Control. Mar 2002, 124(1): 35-40 (6 pages)
Published Online: June 26, 2001
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Received:
June 26, 2001
Citation
Tran, C. M., and Southward, S. C. (June 26, 2001). "A Virtual Sensing Method for Tonal ANVC Systems ." ASME. J. Dyn. Sys., Meas., Control. March 2002; 124(1): 35–40. https://doi.org/10.1115/1.1435642
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