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2016 | OriginalPaper | Chapter

35. Robust Occupant Detection Through Step-Induced Floor Vibration by Incorporating Structural Characteristics

Authors : Mike Lam, Mostafa Mirshekari, Shijia Pan, Pei Zhang, Hae Young Noh

Published in: Dynamics of Coupled Structures, Volume 4

Publisher: Springer International Publishing

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Abstract

The objective of this paper is to present an occupant detection method through step-induced structural vibration. Occupant detection enables various smart building applications such as space/energy management. Ambient structural vibration monitoring provides a non-intrusive sensing approach to achieve that. The main challenges for structural vibration based occupant footstep detection include that (1) the ambient structural vibration noise may overwhelm the step-induced vibration and (2) there are various other impulse-like excitations that look similar to footstep excitations in the sensing environment (e.g., door closing, chair dragging, etc.), which increase the false alarm rate for occupant detection. To overcome these challenges, a two-stage step-induced signal detection algorithm is developed to (1) incorporate the structural characteristics by selecting the dominant frequencies of the structure to increase the signal-to-noise ratio in the vibration data and thus improve the detection performance and (2) perform footstep classification on detected events to distinguish step-induced floor vibrations from other impulse excitations. The method is validated experimentally in two different buildings with distinct structural properties and noise characteristics, Carnegie Mellon University (CMU) campus building and Vincentian Nursing Home deployments in Pittsburgh, PA. The occupant footstep detection F1 score shows up to 4X reduction in detection error compared to traditional thresholding method.

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Title: Robust Occupant Detection Through Step-Induced Floor Vibration by Incorporating Structural Characteristics
Authors: Mike Lam
Mostafa Mirshekari
Shijia Pan
Pei Zhang
Hae Young Noh
Publisher: Springer International Publishing
Book: Dynamics of Coupled Structures, Volume 4
Print ISBN: 978-3-319-29762-0

Electronic ISBN: 978-3-319-29763-7

Copyright Year: 2016
DOI: https://doi.org/10.1007/978-3-319-29763-7_35

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