Example of improving a scuttle shake (sometimes called cowl shake) of a convertible car by using OMA(Operational Modal Analysis)

　　　Definition of scuttle shake:

　　　・Typical vibration of many convertible cars
　　　・The condition occurs at the speed 40km〜60km/h on citycity (rough) roads.
　　　・The vibration frequency is relatively low（10〜20Hz）

---------------------- Experimental analysis by ModalVIEW -------------------------------
　

　　　Torsional mode　17Hz　　　　　　　

　　 Same mode is 19Hz by EMA because of small amplitude of vibration.

　　

Countermeasure


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