Relationship between pneumatic conveying flow regimes and acoustic signals based on DWT and HHT analysis

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2025-02-10 DOI:10.1016/j.powtec.2025.120773

Jiawei Zhou , Tang Gan , Xiangyu Yan , Yaojie Xu , Hongxiang Jiang

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Abstract

To clarify the relationship between flow regimes and acoustic signals in pneumatic conveying, the acoustic signal of pneumatic conveying process was non-intrusively collected. Frequency and energy characteristics of acoustic signals were analyzed by using the discrete wavelet transform (DWT) and the Hilbert-Huang transform (HHT) to reveal the flow regime transformation during pneumatic conveying. Results show that the effective acoustic signal of pneumatic conveying is mainly concentrated in the region of 0 to 37.5 Hz, and the amplitude of the acoustic signal is positively correlated with the discharge pressure. The flow regime changes from plug flow to dune flow and suspended flow with the increase in acoustic signal amplitude in. The summarized Hilbert spectrum energy of the acoustic signal during the steady conveying stage is mainly concentrated in the range of 0 to 20 Hz. The energy of the Intrinsic Mode Function (IMF) components shows a trend of first decreasing and then increasing with the discharge pressure, which corresponds to plug flow, dune flow, and suspended flow regimes, respectively.

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基于DWT和HHT分析的气力输送流型与声信号的关系

为了明确气力输送过程中气流流态与声信号之间的关系，对气力输送过程中的声信号进行了非侵入式采集。利用离散小波变换（DWT）和Hilbert-Huang变换（HHT）分析了声信号的频率和能量特征，揭示了气力输送过程中的流态变化。结果表明：气力输送的有效声信号主要集中在0 ~ 37.5 Hz区域，声信号幅值与排气压力呈正相关；随着声信号幅值的增大，流型由塞流转变为沙丘流和悬浮流。稳定输送阶段声信号的希尔伯特谱能量主要集中在0 ~ 20 Hz范围内。本征模态函数（IMF）分量的能量随流量压力的增大呈现先减小后增大的趋势，分别对应于堵塞流、沙丘流和悬浮流三种流型。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.

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