This paper describes the active attenuation of fluid borne noise (FBN) with several harmonic components in a simple hydraulic system. A pump with a fixed speed was used as the noise source and a fast-response servo valve was used as to generate the anti-noise signal. Different working conditions were achieved by adjusting the load valve at the end of hydraulic circuit, which affects the system's hydraulic impedance spectrum. Two different adaptive methods using filtered reference least mean square (FXLMS) notch filter with online identification algorithm in time-domain were used. However, the auxiliary white noise applied for system Online identification may increase the residual noise. It was found that FBN reflections from both ends of hydraulic circuit can change the dynamic response of the actuator. In addition to the experiments, Simulation work of active control of fluid borne noise in the simple hydraulic system was performed. The dynamic response of the hydraulic system with active noise control flow was described using, the method of characteristics (MOC). It was found that typically 20 dB attenuation could be achieved to reduce the target harmonic components of the fluid borne noise an insignificant level.
|Publication status||Published - Apr 2009|
|Event||7th International Conference on Fluid Power Transmission and Control (ICFP 2009) - Zhejiang University, Hangzhou, China|
Duration: 7 Apr 2009 → 10 Apr 2009
|Conference||7th International Conference on Fluid Power Transmission and Control (ICFP 2009)|
|City||Zhejiang University, Hangzhou|
|Period||7/04/09 → 10/04/09|
Wang, L., & Johnston, D. N. (2009). Narrow-band fluid borne noise attenuation using time-domain online control algorithms in a simple hydraulic system. Paper presented at 7th International Conference on Fluid Power Transmission and Control (ICFP 2009), Zhejiang University, Hangzhou, China.