Nonlinear dynamic analysis of aquaculture platforms in irregular waves based on Hilbert–Huang​ transform

Ma, Chao; Xie, Sida; Bi, Chen; Zhao, Yunpeng

doi:10.1016/j.jfluidstructs.2022.103831

Cited by 12 publications

(1 citation statement)

References 30 publications

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“…In the present study, the nonlinearity of the heave motion induced by the wave-frequency loads is overlooked. This is because the nonlinearity is dominated by the low-frequency excitations [31].…”

Section: Time-domain Analysismentioning

confidence: 99%

Time–Frequency Analysis of Nonlinear Dynamics of an Aquaculture Cage Array in Waves

Zhu,

Cheng,

Wang

et al. 2023

JMSE

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The nonlinear dynamic response of an aquaculture cage array caused by wave-frequency and low-frequency excitations coupled with the nonlinearity of the mooring and the netting system is a complicated problem. So far, this problem still has not been completely understood. To address this issue, we consider the nonlinear interaction of an extreme wave with an aquaculture cage array containing 16 net cages in a 2 × 8 configuration. This paper aims to provide insight into understanding the nonlinear dynamics of an aquaculture cage array via time–frequency analysis. Time-domain analysis shows that the cage array exhibits weak nonlinearity in the surge and heave motions. On the contrary, there is strong nonlinearity in the sway motion under 45° and 90° wave attacks. Aside from this, the frequency-domain analysis indicates that nonlinearities exist in all three of these different responses (surge/sway/heave). Particularly, the low-frequency component has a predominant effect on the nonlinearity of the sway motion under 45° and 90° wave attacks. With this understanding, future aquaculture fish farms that contain multiple cages (i.e., cage array) can be potentially designed to withstand severe conditions in the open ocean.

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Section: Time-domain Analysismentioning

confidence: 99%

Time–Frequency Analysis of Nonlinear Dynamics of an Aquaculture Cage Array in Waves

Zhu,

Cheng,

Wang

et al. 2023

JMSE

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Status Monitoring System of Reciprocating Hydrogen Compressor Based on Hilbert−Huang Transform

Li,

Gao,

Zhao

2024

Applied Research

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A reciprocating hydrogen compressor status monitoring system for predictive maintenance is developed based on HHT (Hilbert−Huang Transform) with multiple functions, strong applicability, and high accuracy to address the problem of difficulty in identifying fault signals and failure to provide advance warning before faults occur in the reciprocating hydrogen compressor state monitoring system. Design framework of monitoring system is confirmed, and function modules are designed based on LabView platform. HHT is applied to monitor the status of reciprocating hydrogen compressor based on LabView platform. A reciprocating hydrogen compressor is selected as research object, status monitoring analysis is carried out. Five working states of reciprocating hydrogen compressor are collected, which conclude normal state, filler malfunction, cross‐head malfunction, air valve malfunction, and piston rod malfunction. HHT is carried out for five signals, and results show that HHT marginal spectrum of five signals has different characteristics. Based on comparison results, precision of HHT ranges from 0.757 to 0.784, recall of HHT ranges from 0.738 to 0.766, F1‐score of HHT ranges from to 0.788 to 0.804, HHT has better performance than other two methods. Proposed monitoring system designed in this study provides a comprehensive and efficient online monitoring and data analysis solution for reciprocating hydrogen compressors, which can achieve fault prediction of reciprocating hydrogen compressor, reduce failure rate, and effectively improve the reliability of the compressor oil injection system.

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A comparative study of two fish farm layouts under pure current conditions

Aydemir,

Cheng,

Ong

2024

Applied Ocean Research

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Nonlinear dynamic analysis of aquaculture platforms in irregular waves based on Hilbert–Huang transform

Cited by 12 publications

References 30 publications

Time–Frequency Analysis of Nonlinear Dynamics of an Aquaculture Cage Array in Waves

Time–Frequency Analysis of Nonlinear Dynamics of an Aquaculture Cage Array in Waves

Status Monitoring System of Reciprocating Hydrogen Compressor Based on Hilbert−Huang Transform

A comparative study of two fish farm layouts under pure current conditions

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Nonlinear dynamic analysis of aquaculture platforms in irregular waves based on Hilbert–Huang​ transform

Cited by 12 publications

References 30 publications

Time–Frequency Analysis of Nonlinear Dynamics of an Aquaculture Cage Array in Waves

Time–Frequency Analysis of Nonlinear Dynamics of an Aquaculture Cage Array in Waves

Status Monitoring System of Reciprocating Hydrogen Compressor Based on Hilbert−Huang Transform

A comparative study of two fish farm layouts under pure current conditions

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Product

Resources

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Nonlinear dynamic analysis of aquaculture platforms in irregular waves based on Hilbert–Huang transform