From http://iopscience.iop.org/0960-1317/14/5/009/pdf/jmm4_5_009.pdf
last figure is effeciency. Table 1. Physical characteristics of power conversion devices. Efficiency η Reference Technology k2 Q fn (kHz) from (9) Goldfarb and Stack 0.581 1.63 39 0.531 Celanovic [16] Ivensky et al Bulk 0.029 1070 100.7 0.941 [20] Funasaka et al Cantilever, 0.08 229 4.75 0.909 [17] LiNbO3 Funasaka et al Cantilever, 0.043 200 2.71 0.818 [17] PZT Baborowski Diaphragm 0.053 135 97.5 0.791 et al [21] Umeda et al Diaphragm 0.125 53 4 0.791 [15] One problem is the high frequency of optimal operation. Are there any devices that can transform my 1 Hz kilonewton mechanical power to 100 kHz vibrations instead? David David Jonsson, Sweden, phone callto:+46703000370
