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Digital overflow type charging line active noise control device and noise control method thereof

A technology of liquid-filled pipelines and noise reduction devices, which is applied in the direction of pipe components, pipes/pipe joints/pipe fittings, mechanical equipment, etc., can solve problems such as shortage, and achieve reduction in number, high and low frequency acoustic emission performance, and low power Effect

Pending Publication Date: 2018-11-16
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current liquid-filled pipeline active muffler is still difficult to effectively suppress the very low frequency line spectrum noise below 100 Hz, the main reason is the lack of high-power low-frequency acoustic emission transducers that can withstand high static pressure

Method used

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  • Digital overflow type charging line active noise control device and noise control method thereof
  • Digital overflow type charging line active noise control device and noise control method thereof
  • Digital overflow type charging line active noise control device and noise control method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0041] This embodiment provides a preferred implementation of the main controller 9 .

[0042] see figure 2, the main controller 9 includes: a signal conditioner 91 with signal amplification and low-pass filtering functions, an AD converter 92, a feedback controller 93 for generating an anti-phase noise signal, and a switch for controlling the electronically controlled valve 7 Delta-Sigma modulator 94, the input end of described signal conditioner 91 is connected the output end of described hydrophone 10, described signal conditioner 91, AD converter 92, feedback controller 93 and Delta-Sigma modulator 94 Electrically connected in sequence, each output end of the Delta-Sigma modulator 94 is connected to the electronically controlled valve 7 in one-to-one correspondence.

[0043] The signal conditioner 91 is mainly composed of a charge amplifier and a low-pass filter, and the charge amplifier is a signal amplifying device dedicated to piezoelectric sensors such as acceleromet...

Embodiment 3

[0051] Technical scheme two of the present invention is as follows:

[0052] see image 3 , an active noise reduction method for a digital overflow liquid-filled pipeline, the noise reduction method is based on the active noise reduction device for a digital overflow liquid-filled pipeline, comprising the following steps:

[0053] Step 1, pick up the original noise signal in the pipe by the hydrophone 10, and then input the original noise signal to the main controller 9;

[0054] Step 2, the main controller 9 converts the input original noise signal into a digital signal and performs an inverted output;

[0055] Step 2-1, the main controller 9 amplifies and low-pass filters the input original noise signal;

[0056] Step 2-2, performing A / D conversion on the original noise signal to generate a digital signal;

[0057] Step 2-3, converting the digital signal into an equal-amplitude inversion digital signal;

[0058] Step 2-4, converting the equal-amplitude anti-phase digital...

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Abstract

The invention relates to a digital overflow type charging line active noise control device. The device comprises a main pipeline, an upstream flange, a downstream flange, a shell, a by-pass pipe, a plurality of by-pass branch pipes, a plurality of electric control valves, a drainage pipe, a main controller used for controlling opening and closing of the electric control valves, and a hydrophone, wherein the by-pass pipe, the by-pass branch pipes, the electric control valves, the drainage pipe, the main controller and the hydrophone are located in the shell. The shell is fixed to the outer sidewall of the main pipeline. One end of the by-pass pipe is fixed to the side wall of the main pipeline and communicates with the main pipeline. One ends of the by-pass branch pipes communicate with the by-pass pipe, and the other ends of the by-pass branch pipes are connected to the drainage pipe. A drainage port of the drainage pipe is fixed to the shell. The electric control valves are arrangedon the by-pass branch pipes in a one-to-one correspondence mode. The electric control valves are electrically connected to the main controller. The hydrophone is fixed to the side wall of the main pipeline, a sensing head of the hydrophone is located in the main pipeline, and the output end of the hydrophone is connected with the main controller. According to the device, opposition sound waves areradiated in the pipes in a fluid velocity fluctuation control mode, accordingly, the low-frequency sound emitting performance is higher, the size is smaller, and the static pressure bearing capacityis larger.

Description

technical field [0001] The invention relates to a digital overflow liquid-filled pipeline active noise reduction device and a noise reduction method thereof, belonging to the technical field of noise control. Background technique [0002] Liquid-filled pipeline systems can transmit energy flow, momentum flow or mass flow in a wide range of temperature and pressure, and have been widely used in various industrial fields and play an important role, such as hydraulic pipelines, cooling water pipelines, oil pipelines Wait. Liquid-filled pipeline systems generally drive fluid through mechanisms such as centrifugal pumps and reciprocating pumps. When the flow pulsation generated by the rotating or reciprocating mechanism is transmitted in the pipeline, the fluid in the pipeline will generate pressure due to the influence of the pipeline and load impedance. Pulsation, which manifests itself as dynamic noise in the fluid. The noise energy is mainly distributed in the low frequency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/033
CPCF16L55/033
Inventor 安峰岩刘碧龙
Owner QINGDAO TECHNOLOGICAL UNIVERSITY