Class9 - CEE511 Structural Dynamics: Accelerometers 3...

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1 Accelerometers CEE511 Structural Dynamics: CEE511 Structural Dynamics University of Michigan October 5, 2007 Prof. J. P. Lynch October 6, 2010 Prof. Jerry Lynch University of Michigan Accelerometers • 3 accelerometer types used in civil structures: Force balance accelerometers (FBA) • Greatest market share • Expensive at approximately $1000 per FBA Piezoelectric accelerometers • Popular in dynamic settings • Moderate pricing at approximately $400 per accelerometer Microelectromechanical system (MEMS) p s nts th f t CEE511 Structural Dynamics University of Michigan • Represents the future • Demand driven by car manufacturer • Small and accurate • Inexpensive $5-50 per accelerometer Force Balance Accelerometer 12 cm • Feedback current that balances internal mass is proportional to cceleration Operating Principle Kinemetrics EpiSensor CEE511 Structural Dynamics University of Michigan accelerat on • California Building Code (2001) requires at least 3 accelerometers
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Class9 - CEE511 Structural Dynamics: Accelerometers 3...

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