Abstract
Virginia Tech’s Goodwin Hall is instrumented with over 200 highly sensitive, seismic accelerometers. These sensors detect motion from vibration sources inside the building (e.g. footsteps, HVAC equipment, and closing doors) and external (seismic motion and wind loading). The later sources produce much weaker excitations for the sensors and result in lower signal-to-noise ratios. Therefore, it is important to estimate the inherent noise present in the accelerometer signals in order to determine and analyze the actual building vibrations from seismic motion and wind loading. Sources of noise include electrical interference and self-noise in the instrumentation system including the accelerometers, cables, and signal conditioning amplifiers. This paper will examine several techniques for using collocated sensors for estimating the power spectral densities of the noise present in accelerometer measurements. First these estimation techniques are applied to simulated signals corrupted by noise. Then these methods are applied to laboratory data from several accelerometers placed on a vibration isolation table.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Brincker, R.: Some elements of operational modal analysis. Shock Vib. 2014, 11 (2014)
Ringler, A.T., Hutt, C.R., Evans, J.R., Sandoval, L.D.: A comparison of seismic instrument noise coherence analysis techniques. Bull. Seismol. Soc. Am. 101, 558–567 (2011)
Piersol, A.G.: Harris’ Shock and Vibration Handbook, 6th edn. McGraw-Hill, New York (2010)
Poston, J.D., Schloemann, J., Buehrer, R.M., Sriram Malladi, V.V.N., Woolard, A.G., Tarazaga, P.A.: Towards indoor localization of pedestrians via smart building vibration sensing. In: 2015 International Conference on Localization and GNSS (ICL-GNSS), pp. 1–6 (2015)
Schloemann, J., Malladi, V.V.N.S., Woolard, A.G., Hamilton, J.M., Buehrer, R.M, Tarazaga, P.A.: Vibration event localization in an instrumented building. In: International Modal Analysis Conference (IMAC) XXXIII, Orlando, 2–5 February (2015)
Evans, J.R., Followill, F., Hutt, C.R., Kromer, R.P., Nigbor, R.L., Ringler, A.T., Steim, J.M., Wielandt, E.: Method for calculating self-noise spectra and operating ranges for seismographic inertial sensors and recorders. Seismol. Res. Lett. 81, 640–646 (2010)
Payne, B.F., Serbyn, M.R.: An application of parameter estimation theory in low frequency accelerometer calibrations. Presented at the fourteenth transducer workshop, Colorado Springs, CO (1987)
Tasic, I., Runovc, F.: Seismometer self-noise estimation using a single reference instrument. J. Seismol. 16(2), 183–194 (2012)
Rainieri, C., Fabbrocino, G.: Operational Modal Analysis of Civil Engineering Structures: An Introduction and Guide for Applications, 1st edn. Springer-Verlag, New York (2014)
Ewins, D.J.: Modal Testing: Theory, Practice, and Application, 2nd edn. Research Studies Press Ltd., Hertfordshire, England (2000)
Wirsching, P.H., Paez, T., Ortiz, K.: Random Vibrations: Theory and Practice. Wiley, New York (1995)
Welch, P.D.: The use of fast Fourier transform for the estimation of power spectra: a method based on time averaging over short, modified periodograms. IEEE Trans. Audio Electroacoust 15(2), 70–73 (1967)
Steinhardt, A., Makhoul, J.: On the autocorrelation of finite-length sequences. IEEE Trans. Acoust. Speech Signal Process 33(6), 1516–1520 (1985)
Holcomb, L.G.: A Direct Method for Calculating Instrument Noise Levels in Side-by-Side Seismometer Evaluations, pp. 89–214. U.S. Geological Survey, Albuquerque, New Mexico (1989)
Holcomb, L.G: A Numerical Study of Some Potential Sources of Error in Side-by-Side Seismometer Evaluations, pp. 90–406. U.S. Geological Survey, Albuquerque, New Mexico (1990)
Brincker, R., Larsen, J.A.: Obtaining and estimating low noise floors in vibration sensors. Presented at the 2007 IMAC-XXV: conference & exposition on structural dynamics (2007)
Sleeman, R., van Wettum, A., Trampert, J.: Three-channel correlation analysis: a new technique to measure instrumental noise of digitizers and seismic sensors. Bull. Seismol. Soc. Am. 96(1), 258–271 (2006)
Acknowledgements
The authors are thankful for the support and collaborative efforts provided by our sponsors VTI Instruments; PCB Piezotronics, Inc.; Dytran Instruments, Inc.; and Oregano Systems. The authors would also like to recognize the support from the College of Engineering at Virginia Tech, collaboration efforts with Gilbane, Inc., and financial support from the Student Engineering Council at Virginia Tech.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2016 The Society for Experimental Mechanics, Inc.
About this paper
Cite this paper
Joyce, B.S., Tarazaga, P.A. (2016). Estimating Noise Spectra for Data from an Instrumented Building. In: Atamturktur, S., Schoenherr, T., Moaveni, B., Papadimitriou, C. (eds) Model Validation and Uncertainty Quantification, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-29754-5_9
Download citation
DOI: https://doi.org/10.1007/978-3-319-29754-5_9
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-29753-8
Online ISBN: 978-3-319-29754-5
eBook Packages: EngineeringEngineering (R0)