Active and passive integrated composite muffler device for liquid-filled pipelines

Abstract

The objective of the invention is to provided an integrated active and passive combined silencing apparatus for a fluid filled pipe. The integrated active and passive combined silencing apparatus comprises a housing, an upstream outer pipe end socket and a downstream outer pipe end socket. The housing is equipped with a through hole. The upstream outer pipe end socket and the downstream outer pipe end socket are fixed to the two ends of the through hole respectively. The upstream outer pipe end socket is connected to a tubular sensing / actuating integration device, and the downstream outer pipe end socket is connected to a hole passing pipe segment. The tubular sensing / actuating integration device is connected to the hole passing pipe segment. The tubular sensing / actuating integration device comprises a base layer, a sensing layer and an actuating layer, wherein the actuating layer is fixed to the outer surface of the base layer, and the sensing layer is fixed to the inner surface of the base layer. The upstream outer pipe end socket is provided with a hydrophone. Signals generated by the hydrophone and the sensing layer pass through a cable and then are sent to an active controller through a signal pick-up and lowpass filtering system. After the active controller calculates control signals, the actuating layer is driven by means of a power amplification system. A complementary effect is exhibited for noise abatement frequency bands, and noise control over full frequency bands can be achieved.

Description

technical field [0001] The invention relates to a muffler, in particular to a muffler for a liquid-filled pipeline. Background technique [0002] Liquid-filled pipelines are widely used in the field of ships, but the noise control of pipeline systems has always been a difficult problem for people. The fluid noise in the pipeline not only affects the living environment of the staff, but also the transmission of the fluid noise will cause stress pulsation and mechanical vibration of the downstream pipeline or other equipment, which will reduce the service life of the equipment; Will reduce the concealment of the ship. At present, installing muffler equipment in liquid-filled pipelines is the most economical and widespread solution. However, the traditional impedance muffler cannot track the change of noise frequency and the low-frequency noise reduction is not obvious, and the active muffler cannot satisfy the middle and high frequency noise reduction. Therefore, the existin...

AI Technical Summary

Problems solved by technology

It mainly uses active noise reduction to offset low-frequency noise, the effect of medium-high frequency noise reduction is not obvious, and the medium-high frequency secondary noise derived from the actuator cannot be processed

Images