Modal analysis is practised for machine tool chatter, Automobile & ship NVH (Noise Vibration & Harshness), Civil (Building, Bridges) structural damage & Aircraft flutter. Modal analyses find shapes and frequencies at which structure will amplify the effect of load and is a major tool in the design of safe optimal structures.
The analyses :
The EEMAK (Experimental Modal Analyses Kit)
This kit consists of
The EH Force exciter superposes heavy dynamic forces over static forces over a wide frequency range. EH force exciter is compact and light , a major advantage over electrodynamic exciters. It consists of a Tandem actuator, EH Servo valve , Integral Loadcell & Position Transducer. The control with amplitude modulation, enables the force level to be maintained as the frequency is swept. The exciter functions in Sinusoidal, Swept Sine & Random modes.
The response of the load to the excitation is measured at multiple points on the structure , by accelerometers whose outputs are then analysed by the Modal Analysis software. The software extracts the modal parameters of frequencies and damping factors of the structure under study.
It generates the Geometrical model and displays the animated mode shapes of the structure. This software also provides an "IF/Then" solutions to any structural design change.
Exciter, Controller
Force Frequency Spectrum
Frequency Response Function (FRF)
Frequency Response Function (FRF)
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