Noise radiation through the blade pump is the focus of noise control in the power systems of ships, while low-frequency line spectral vibration with high energy need to be further suppressed. An Active Vibration Control (AVC) system adapted to blade pump is designed to attenuate low-frequency line spectral vibration. This system is made up of the secondary source, controller, power amplifier, sensor etc. The system uses a frequency tracking algorithm to estimate the frequencies of vibration, and a complex LMS algorithm to design the controller. A pump water circulation system is implemented to validate the control system's performance in vibration reduction through experiments. Active control experiments on vibration of the pump with fixed frequency and multi-frequency are carried out respectively. The results show that the control system can track frequencies automatically, and effectively reduce the vibration transferring from the pump to the foundation in cases of fixed frequency and multi-frequency. The AVC system can achieve vibration attenuation of over 5 dB at multi-frequencies and has good robustness. This provides a possible solution for the control of low-frequency line spectral vibration of the pumps onboard ships.
