EDUCATION:

2015 Ph.D. – Engineering Mechanics, University of Wisconsin-Madison
Dissertation: A Full-Field Experimental and Numerical Investigation of Nonlinear Normal Modes in Geometrically Nonlinear Structures

2011 M.S. – Mechanical Engineering, Bradley University
Thesis: Dynamic Response of Curved Beams using 3D Digital Image Correlation: Calibration, Full-Field Measurements, and Analysis

2009 B.S. – Mechanical Engineering, Bradley University

POSITIONS HELD:

2017 – 2021 – Owner, Ehrhardt Engineering LLC, Monticello, IL

2016 – 2017 – Post-Doctoral Researcher, Air Force Research Lab, Wright-Patterson Air Force Base

2015 – 2016 – Post-Doctoral Research Assistant, University of Bristol, Bristol, UK

Journal Publications:

Riley, Z.B., Hagen, B., and Ehrhardt, D.A., “Aero-optical Measurements of the Response of a Thin Panel at Mach 6,” American Institute of Aeronautics and Astronautics Journal (submitted)

Brouwer, K.R., Perez, R.A., Beberniss, T.J., Spottswood, S.M., and Ehrhardt, D.A., “Experiments on a Thin Panel Excited by Turbulent Flow and Shock/Boundary Layer Interactions,” American Institute of Aeronautics and Astronautics Journal 2021. DOI: 10.2514/1.J060114

Brouwer, K.R., Perez, R.A., Beberniss, T.J., Spottswood, S.M, Ehrhardt, D.A., and Wiebe, R., “Investigation of aeroelastic instabilities for a thin panel in turbulent flow,” Nonlinear Dynamics 2021. DOI: 10.1007/s11071-021-06571-4

Riley, Z.B., Perez, R.A., and Ehrhardt, D.A., “Response of a Thin Panel to Aerothermal Loading at Mach 6,” American Institute of Aeronautics and Astronautics Journal 2021. DOI: 10.2514/1.J060404

Beberniss, T.J., and Ehrhardt, D.A., “Visible Light Refraction Effects on High-speed Stereo Digital Image Correlation Measurement of a Thin Panel in Mach 2 Flow,” Experimental Techniques 2021. DOI: 10.1007/s40799-020-00408-2

Ehrhardt, D.A., Virgin, LN., Spottswood, S.M., “Experiments on probing the configuration space of post-buckled panels,” Journal of Applied Mechanics 2020. DOI: 10.1115/1.4048197

Ehrhardt, D.A., Hill, T.L., Neild, S.A., Cooper, J.E., “Experimentally measuring an isolated branch of Nonlinear Normal Modes,” Journal of Sound and Vibration 2020. DOI: 10.1016/j.jsv.2019.6.006

Ehrhardt, D.A., Virgin, L.N., and Spottswood, S.M., “Experiments on the thermal post-buckling of panels, including localized heating,” Journal of Sound and Vibration 2019. DOI: 10.1016/j.jsv.2018.08.043

Renson, L., Hill, T.L., Ehrhardt, D.A., Barton, D.A.W., and Neild, S.A., “Force appropriation of nonlinear structures,” Proceedings. Mathematical, Physical, and Engineering Sciences 2018. DOI: 10.1098/rspa.2017.0880

Ehrhardt, D.A., Hill, T.L., Neild, S.A., Cooper, J.E., “Veering and Nonlinear Interactions of a Clamped Beam in Bending and Torsion,” Journal of Sound and Vibration 2018. DOI: 10.1016/j.jsv.2017.11.045

Szalai, R., Ehrhardt, D.A., and Haller, G., “Nonlinear Model Identification and Spectral Submanifolds for Multi-Degree-of-Freedom Mechanical Vibrations.” Proceedings. Mathematical, Physical, and Engineering Sciences 2017. DOI: 10.1098/rspa.2016.0759.

Ehrhardt, D.A., Allen, M.S., Beberniss, T.J., and Neild, S.A., “Finite Element Model Calibration of a Nonlinear Perforated Plate,” Journal of Sound and Vibration 2017. DOI: 10.1016/j.jsv.2016.12.037

Beberniss, T.J. and Ehrhardt, D.A., ” High-speed 3D digital image correlation vibration measurement: Recent advancements and noted limitations,” Mechanical Systems and Signal Processing 2017. DOI: 10.1016/j.ymssp.2016.04.014

Ehrhardt, D.A., Yang, S., Beberniss, T.J., and Allen, M.S., “Full Field Measurements of beams and plates with Continuous-Scan Laser Doppler Vibrometry and 3D-Digital Image Correlation,” Mechanical Systems and Signal Processing 2017. DOI: 10.1016/j.mssp.2015.12.00

Ehrhardt, D.A., Allen, M.S., and Beberniss, T.J., “Measurement of Nonlinear Normal Modes using Multi-Harmonic Force Appropriation and Free Decay,” Mechanical Systems and Signal Processing 2016. DOI: 10.1016/j.ymssp.2016.02.063