High power piezoelectric axial shockwave generation

More Magazines

Recommendations

Info

Experimental studies6on piezo-shock-generatorsThe cooperation between HILTI/Schaan/Liechtensteinand PIEZOMECHANIK/Munich/Germanywas focusing on high power mechanical shockgeneration by using high voltage high load piezostacks.HILTI is the leading manufacturer of highest qualitytools for demolition, chiselling based on the electropneumatichammer principle. The high efficiency ofthese tools is based on the very exact matching ofall involved parts for the shock transfer from thehammer head down to the tip of the chisel.Piezo-shock-generators with their high powerlevels, high repetition rates and reproducible shockparameters are used for R&D activities to shortentest periods on these components significantly.12
056.1 Experimental set upHigh voltage high load piezo-stacks with an activediameter 35 were used as the electro-mechanicalimpulse converter.Emphasis has been put onto a shock proof designof the stack itself and the applied high current electrodes.At the very beginning of this project, standard "lowdielectric, low capacitance" PZT-actuator ceramicshas been ruled out because of its reduced "shockpower" efficiency. Consequently all shock generatorstacks were based on the highly dielectric highpower PZT-material HP from PIEZOMECHANIK.For an optimum acoustical matching, the piezostackswhere combined with steel bars of 18 mmdiameter.The shock pulses propagating within the steel barshave been characterized by Laser-Doppler-Anemometry(LDA) determining the particle velocity atbar's surface, when the shock wave passes by.From this particle velocity, the related strainvariation has been derived. Together with the wellknowelastic properties of steel, the energy andimpulse content of the shock front can beevaluated.13
Page 1 and 2: High power piezoelectric axialshock
Page 3 and 4: Stand der01Piezo-Multilayer-Technik
Page 5 and 6: 2.2 Collision mechanicsIn practice,
Page 7 and 8: 1.1 3.2 Piezostapel Symmetrical mit
Page 9 and 10: Characterizing piezostackbasedshock
Page 11: 5. Electrical pulse excitationSchem
Page 15 and 16: 6.3 Single output shock generationT
Page 17 and 18: Stand der08Piezo-Multilayer-Technik
Page 19 and 20: 9.1 Impact propagation in the ideal
Page 21 and 22: 9.2 Stress impulse generation by a

High power piezoelectric axial shockwave generation

Transform your PDFs into Flipbooks and boost your revenue!

Delete template?

Save as template ?