This paper describes the active cancellation of fluid borne noise for several harmonic orders caused by a pump in a simple hydraulic system. A servo valve is applied as an actuator, which generates an anti-noise signal in real time. The filtered reference least mean square (FXLMS) adaptive control method with a notch adaptive filter is used. It was found that ripple reflection from both ends of the hydraulic circuit affected the performance and stability of the cancellation method. In order to execute the cancellation without any prior information about the dynamics of the hydraulic system, the online secondary path identification method was used. For efficiency and robustness, a fast block LMS (FBLMS) online secondary path identification algorithm was applied to give fast adaptive performance. However, an auxiliary white-noise signal applied to the system for this on-line method may increase residual noise. In addition to the experiments, simulations of the active cancellation system were performed. The dynamic behaviour of the system was modelled using the method of characteristics (MOC). It was found experimentally that selected harmonics of fluid-borne noise could be attenuated by about 20dB under normal working conditions.
|Number of pages||12|
|Publication status||Published - Sept 2008|
|Event||Bath/ASME Symposium on Fluid Power and Motion Control 2008 - Bath|
Duration: 10 Sept 2008 → …
|Conference||Bath/ASME Symposium on Fluid Power and Motion Control 2008|
|Period||10/09/08 → …|