Piezoelectric shakers have been developed and used at NIST for decades for high-frequency calibration of accelerometers. Recently, NIST researchers built new piezoelectric shakers in the hopes of enabling more accurate calibrations of accelerometers while extending the calibration frequency range beyond 20 kHz. The ability to build and measure piezoelectric shakers invites modeling of these systems in order to improve their design for increased accuracy in the calibration of accelerometers, which requires a sinusoidal motion with lower distortion, lower cross-axial motion, and an increased frequency range. In this paper, we present a model of piezoelectric shakers and match it to experimental data. The nist-equations of motion for all masses are solved along with the coupled state nist-equations for the piezoelectric actuator. Finally, additional electrical elements like inductors, capacitors, and resistors are added to the piezoelectric actuator for matching of experimental and theoretical frequency responses.
9th International Conference on Vibration Measurements by Laser and Noncontact Techniques
June 22-25, 2010
calibration, accelerometers, vibration, piezoelectric actuation, shakers