Influences of the placement of secondary sources and error sensors on acousto-vibration hybrid active control of the liquid-filled straight pipe with an elastic baffle
For the active noise control of the liquid-filled pipe system,the influences of the placeiment of secondary sources and error sensors on the hybrid active noise and vibration control effect of the liquid-filled straight pipe system with an elastic baffle are studied.Based on the acoustic-solid coupling method,finite element models of the liquid-filled straight pipe systems with an elastic baffle are established.The influence of the placement of secondary sound sources on the active noise control performance of the system is compared under sound excitation.The influences of the placement of secondary force sources,secondary sound sources and error sensors on the hybrid active control of the system are also analyzed under combined excitation.The results show that asymmetrically distributed secondary sound source tends to excite the pipe wall vibration,which in turn drives the vibration of the baffle,leading to poor active noise control effect.Symmetrically distributed secondary sound sources can improve the noise reduction by more than 10 dB in the low frequency band.Hybrid active control can further improve the control effect of the full frequency band.By increasing the number of vibration error sensors,the noise reduction can be improved by anywhere from 1～20 dB at most frequencies.In addition,the control effect is better when the distance between two-loop secondary force sources placed on the pipe wall is less than 1/4 of the vibration wavelength of the pipe wall,and neither of them is located near the vibration node of the pipe wall.
Elastic baffleCombined excitationLiquid-filled straight pipeActive noise controlActive vibra-tion control
万方数据
维普
