Despite the importance of the eardrum and the ossicles in the hearing chain, it remains an open question how acoustical energy is transmitted between them. Identifying the transmission path at different frequencies could lead to valuable information for the domain of middle ear surgery. In this work a setup for stroboscopic holography is combined with an algorithm for power flow calculations. With our method we were able to accurately locate the power sources and sinks in a membrane. The setup enabled us to make amplitude maps of the out-of-plane displacement of a vibrating rubber membrane at subsequent instances of time within the vibration period. From these, the amplitude maps of the moments of force and velocities are calculated. The magnitude and phase maps are extracted from this amplitude data, and form the input for the power flow calculations. We present the algorithm used for the measurements and for the power flow calculations. Finite element models of a circular plate with a local energy sourc...
[1]
S. Timoshenko,et al.
THEORY OF PLATES AND SHELLS
,
1959
.
[2]
J. Adin Mann,et al.
Placing small constrained layer damping patches on a plate to attain global or local velocity changes
,
1995
.
[3]
Yong Zhang,et al.
Measuring the structural intensity and force distribution in plates
,
1996
.
[4]
José Roberto de França Arruda,et al.
Localizing Energy Sources and Sinks in Plates Using Power Flow Maps Computed From Laser Vibrometer Measurements
,
1998
.
[5]
Joris J.J. Dirckx,et al.
Single-Shot Digital Holographic Interferometry Using a High Power Pulsed Laser for Full Field Measurement of Traveling Waves
,
2012
.