Transcription of Vibration Testing (br0227)
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Vibration Testing (br0227)
~ Bruel & Kj r Introduction See paQe This booklet gives an introduction to the methods used Introduction 1. in Vibration Testing and a description GI tne Vibration Why Vibration lesting? 2. exciters and control equipment used in environmental How does an exclter work? 3. 1estlng and in determlna,tlmll of dynamic proper\Jies of The power amplifier 4. structures. The exciter control 4. Basic exciter Instrumentation 5. ,S ine excitation 5. Random excitation 6. Environmental teating 7. Mounting of the teat object 7. Fixtures 8. Static compensation 9. Vibration ,r eaponae li nveatigation 10. Endura,nce conditioning 11. Swept sine Testing 11. Conditioning at aingle frequencies 12. Random teating 13. Derivation of teat data 14. Structural, rHearch 15. Mecl1anlcal impedance and mobility 16. AddJtion of impedances and moblllties 17. Complex elastic modulus 18. Mode studies 19. Resonance studlea 20. 0'. Use complex plots Excitation methods 21.
heating effect of the current. i.e. the RMS value. whereas the power amplifier rating is influenced by the peak values. To give the same force the amplifier must there-fore be larger when used with random than with sine excitation. The random spectrum is described by its power spec-tral density or acceleration spectral density. ASD «m/s2)2/HZJ.
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