Quarter-Wave Pump Attenuator for Broad-Band Noise Reduction
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Solution Overview
Problem
Centrifugal pumps used in noise attenuators for braking dust particle recovery systems generate significant noise pollution across undesirable sound frequencies, causing discomfort for vehicle users.
Innovation Solution
An acoustic attenuation device with a curvilinear channel containing multiple quarter-wave resonators is integrated into the centrifugal pump, allowing for compact installation and effective sound frequency damping across a broad range, utilizing a specific spacing formula to ensure optimal coupling between resonators for continuous frequency band attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a centrifugal pump is used to circulate air through the filtration device, then air circulation and dust filtration are achieved, but significant noise pollution is generated across undesirable sound frequencies
Solution Approach 1:
The noise attenuation device is integrated into the centrifugal pump housing, extracting and isolating the noise problem from the air circulation function. The attenuator elements are positioned to specifically target acoustic waves generated by the pump impeller while allowing unrestricted air flow through the pump chambers.
Solution Approach 2:
The noise attenuation device is nested within the centrifugal pump housing structure. The attenuator elements are arranged in series between pump chambers, utilizing the existing pump geometry to contain acoustic treatment without adding external components or increasing overall device footprint.
2Object-generated harmful factors
If multiple acoustic attenuator elements are arranged in series to achieve broad frequency range attenuation, then effective noise reduction is achieved, but device complexity and space requirements increase
Solution Approach 1:
The noise attenuation device is segmented into multiple discrete attenuator elements arranged in series between different pump chambers. Each element targets specific frequency ranges, and the segmented structure allows independent optimization of each element while maintaining overall compact integration within the pump housing.
Solution Approach 2:
The attenuator elements are arranged in a spatial sequence along the acoustic wave propagation path through the pump chambers. This dimensional arrangement allows multiple frequency targets to be addressed in series without increasing the cross-sectional area or overall footprint of the device.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces noise levels by at least 20 decibels within the desired frequency range, enhancing user experience while maintaining a compact design suitable for integration within existing pump structures.
Implementation Method 1
acoustic attenuator elements tuned to an attenuation resonance frequency, arranged consecutively in series along said channel so as to interact with the gas stream flowing in the channel, the acoustic attenuator elements being formed by cavities of quarter-wave resonators
Data Source
AI summary
Disclosed is an acoustic attenuation device for an electromechanical device through which a gas stream passes which is capable of propagating acoustic waves. The device includes inlet ports and outlet ports for a gas stream, in particular for the purpose of releasing the gas stream into the atmosphere. The device includes a generally annular channel defining a substantially circular flow path for the gas stream about a main axis between the inlet and outlet ports, and a plurality of acoustic attenuator elements which are tuned to an attenuation resonance frequency with an associated attenuation frequency band and are distributed in series circularly along the channel so as to interact with the gas stream flowing in the channel, the acoustic attenuator elements being formed by cavities of quarter-wave resonators.