抄録
A new technique for an active-adaptive attenuator for wide-band random pressure pulsation in liquid piping systems, which controls feed-forwardly the secondary source by the progressive wave component of fluid-borne vibration detected at the upstream of the pipeline and the capability to change system parameters owing to a programmable digital filter, is presented together with computer simulation and experimental results. The adaptive feed-forward control structure is based on the so-called “Filtered-X LMS algorithm”. It is established by the test on the small-sized experimental pipeline that the pressure pulsation in a down stream pipe of the secondary source can be reduced by at least 20 dB for almost all harmonics of around 10 to 800 Hz, while maintaining the stability, even in the case where uncontrolled system parameters such as acoustic properties, dynamic characteristics of secondary source, etc., change with time. It is also shown that the computer simulation agrees well quantitatively with the experimental results and thus can be applied successfully to system design.
