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Diagnostics of Bolted Joints in Vibrating Screens Based on a Multi-Body Dynamical Model

The condition-based maintenance of vibrating screens requires new methods of their elements’ diagnostics due to severe disturbances in measured signals from vibrators and falling pieces of material. The bolted joints of the sieving deck, when failed, require a lot of time and workforce for repair. I...

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Autores principales: Krot, Pavlo, Shiri, Hamid, Dąbek, Przemysław, Zimroz, Radosław
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10489172/
https://www.ncbi.nlm.nih.gov/pubmed/37687487
http://dx.doi.org/10.3390/ma16175794
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author Krot, Pavlo
Shiri, Hamid
Dąbek, Przemysław
Zimroz, Radosław
author_facet Krot, Pavlo
Shiri, Hamid
Dąbek, Przemysław
Zimroz, Radosław
author_sort Krot, Pavlo
collection PubMed
description The condition-based maintenance of vibrating screens requires new methods of their elements’ diagnostics due to severe disturbances in measured signals from vibrators and falling pieces of material. The bolted joints of the sieving deck, when failed, require a lot of time and workforce for repair. In this research, the authors proposed the model-based diagnostic method based on modal analysis of the 2-DOF system, which accounts for the interaction of the screen body and the upper deck under conditions of bolted joint degradation. It is shown that the second natural mode with an out-of-phase motion of the upper deck against the main screen housing may coincide with the excitation frequency or its higher harmonics, which appear when vibrators’ bearings are in bad condition. This interaction speeds up bolt loosening and joint opening by the dynamical loading of higher amplitude. The proposed approach can be used to detune the system from resonance and anti-resonance to reduce maintenance costs and energy consumption. To prevent abrupt failures, such parameters as second natural mode frequency, damping factor, and phase space plot (PSP) distortion measures are proposed as bolt health indicators, and these are verified on the laboratory vibrating screen. Also, the robustness is tested by the impulsive non-Gaussian noise addition to the measurement data. A special diagram was proposed for the bolted joints’ strength capacity assessment and maintenance actions planning (tightening, replacement), depending on clearance in the joints.
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spelling pubmed-104891722023-09-09 Diagnostics of Bolted Joints in Vibrating Screens Based on a Multi-Body Dynamical Model Krot, Pavlo Shiri, Hamid Dąbek, Przemysław Zimroz, Radosław Materials (Basel) Article The condition-based maintenance of vibrating screens requires new methods of their elements’ diagnostics due to severe disturbances in measured signals from vibrators and falling pieces of material. The bolted joints of the sieving deck, when failed, require a lot of time and workforce for repair. In this research, the authors proposed the model-based diagnostic method based on modal analysis of the 2-DOF system, which accounts for the interaction of the screen body and the upper deck under conditions of bolted joint degradation. It is shown that the second natural mode with an out-of-phase motion of the upper deck against the main screen housing may coincide with the excitation frequency or its higher harmonics, which appear when vibrators’ bearings are in bad condition. This interaction speeds up bolt loosening and joint opening by the dynamical loading of higher amplitude. The proposed approach can be used to detune the system from resonance and anti-resonance to reduce maintenance costs and energy consumption. To prevent abrupt failures, such parameters as second natural mode frequency, damping factor, and phase space plot (PSP) distortion measures are proposed as bolt health indicators, and these are verified on the laboratory vibrating screen. Also, the robustness is tested by the impulsive non-Gaussian noise addition to the measurement data. A special diagram was proposed for the bolted joints’ strength capacity assessment and maintenance actions planning (tightening, replacement), depending on clearance in the joints. MDPI 2023-08-24 /pmc/articles/PMC10489172/ /pubmed/37687487 http://dx.doi.org/10.3390/ma16175794 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Krot, Pavlo
Shiri, Hamid
Dąbek, Przemysław
Zimroz, Radosław
Diagnostics of Bolted Joints in Vibrating Screens Based on a Multi-Body Dynamical Model
title Diagnostics of Bolted Joints in Vibrating Screens Based on a Multi-Body Dynamical Model
title_full Diagnostics of Bolted Joints in Vibrating Screens Based on a Multi-Body Dynamical Model
title_fullStr Diagnostics of Bolted Joints in Vibrating Screens Based on a Multi-Body Dynamical Model
title_full_unstemmed Diagnostics of Bolted Joints in Vibrating Screens Based on a Multi-Body Dynamical Model
title_short Diagnostics of Bolted Joints in Vibrating Screens Based on a Multi-Body Dynamical Model
title_sort diagnostics of bolted joints in vibrating screens based on a multi-body dynamical model
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10489172/
https://www.ncbi.nlm.nih.gov/pubmed/37687487
http://dx.doi.org/10.3390/ma16175794
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