Engineering360: "Shake no more: Active vibrational control systems for shock and vibration isolation"

There are two ways to analyse the behaviour and examine if the resonance shape is dangerous or not. Modal Analysis and operational analysis. With modal analysis you can catch the dynamical stiffness and those important frequencies. Of course temperature is moving these peaks but you should recognize the form. Through OVA you get information over whole RPM area (sometimes one have to use cooled sensors like f.i. on exhaust systems in combustion engine), and now comes my RMA (relative movement analysis program) in picture. I can calculate with stripping and reorganising the information bending in 10E-3 mm over structure or relative movement over hanger. If someone could give this information in FE calculation, the stress could be evaluated exactly with real time information. Based on frequency in these resonance situations one can also evaluate if this condition is sever like as durability issues and foremost gives information if using map is available estimation how often one will hit in "life-time" this point. Of course some common sense and experience is needed here, but with these tools one can get very close to reality instead of theoretical CAD pictures. I have used this method in german car industry development as example how much is gearbox bending against engine casing, or which RPM points should be chosen for resonance durability test for exhaust systems or how to adjust engine mounting in for combustion engine using animation of structure , combustion pressure statistics and my RMA program.