Performance analysis and comparison of FXLMS and NFXLMS algorithms for active vibration control

Considerable attention has been devoted recently to active vibration control using intelligent materials as actuators. This paper present result on active control schemes for vibration suppression of flexible aluminium cantilever beam with bonded piezoelectric actuators. The PZT patches were surface bonded near the fixed end of flexible cantilever beam. The exciter and actuator are collocated to achieve a minimum phase. The aim of this work is to implement real time control to suppress vibration. To achieve this, the cantilever beam is taken as device under test, an anti-vibration signal is generated using Normalized Filtered-x Least Mean Square (NFXLMS) control algorithm for feedforward adaptive control is analyzed and compared with Filtered-x Least Mean Square (FXLMS) feed-forward control algorithm. Then the active vibration control experimental platform is established to verify the effectiveness of NFXLMS control scheme as well as FXLMS control scheme. The experimental results of FXLMS and NFXLMS are compared by implementing in Lab View 12.