Cargando…

Mechanical characteristics analysis and control algorithm for floating raft system with mass variation

The ship floating raft system adopts the integrated design of large liquid tanks and rafts, which can optimize the arrangement in the cabin and increase the intermediate mass of the system to achieve efficient vibration isolation of equipment. One of the major challenges is that the change of liquid...

Descripción completa

Detalles Bibliográficos
Autores principales: Shi, Liang, Cheng, Guanghui, Bu, Wenjun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10257668/
https://www.ncbi.nlm.nih.gov/pubmed/37301935
http://dx.doi.org/10.1038/s41598-023-36661-9
_version_ 1785057349117935616
author Shi, Liang
Cheng, Guanghui
Bu, Wenjun
author_facet Shi, Liang
Cheng, Guanghui
Bu, Wenjun
author_sort Shi, Liang
collection PubMed
description The ship floating raft system adopts the integrated design of large liquid tanks and rafts, which can optimize the arrangement in the cabin and increase the intermediate mass of the system to achieve efficient vibration isolation of equipment. One of the major challenges is that the change of liquid mass in the tank will cause displacement of the raft, which will change the modal characteristics of the system and affect the stability of the vibration isolation system performance. This paper establishes a mechanical analysis model of a floating raft system under time-varying liquid mass conditions. Taking a ship variable mass floating raft system as the research object, the effect of mass change on the characteristics of raft displacement, isolator load distribution, and modal frequency of the vibration isolation system is analyzed. The analysis shows that when the liquid tank goes from full load to no-load state, its mass change accounts for 40% of the total mass of the raft, which will cause a large displacement of the raft and change the low order modal frequency of the system, bringing the risk of equipment safety and vibration isolation performance degradation. Therefore, an adaptive variable load control method is proposed to realize the raft attitude balance and load equalization optimization under the variable mass condition of the floating raft air spring system. The test results show that the proposed control method can automatically adapt to the large mass gradual change from full load to no load of the liquid tank on the raft, and control the displacement of the raft structure from about 10 mm to 1.5 mm, which effectively ensures the stability of the air spring system performance.
format Online
Article
Text
id pubmed-10257668
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-102576682023-06-12 Mechanical characteristics analysis and control algorithm for floating raft system with mass variation Shi, Liang Cheng, Guanghui Bu, Wenjun Sci Rep Article The ship floating raft system adopts the integrated design of large liquid tanks and rafts, which can optimize the arrangement in the cabin and increase the intermediate mass of the system to achieve efficient vibration isolation of equipment. One of the major challenges is that the change of liquid mass in the tank will cause displacement of the raft, which will change the modal characteristics of the system and affect the stability of the vibration isolation system performance. This paper establishes a mechanical analysis model of a floating raft system under time-varying liquid mass conditions. Taking a ship variable mass floating raft system as the research object, the effect of mass change on the characteristics of raft displacement, isolator load distribution, and modal frequency of the vibration isolation system is analyzed. The analysis shows that when the liquid tank goes from full load to no-load state, its mass change accounts for 40% of the total mass of the raft, which will cause a large displacement of the raft and change the low order modal frequency of the system, bringing the risk of equipment safety and vibration isolation performance degradation. Therefore, an adaptive variable load control method is proposed to realize the raft attitude balance and load equalization optimization under the variable mass condition of the floating raft air spring system. The test results show that the proposed control method can automatically adapt to the large mass gradual change from full load to no load of the liquid tank on the raft, and control the displacement of the raft structure from about 10 mm to 1.5 mm, which effectively ensures the stability of the air spring system performance. Nature Publishing Group UK 2023-06-10 /pmc/articles/PMC10257668/ /pubmed/37301935 http://dx.doi.org/10.1038/s41598-023-36661-9 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Shi, Liang
Cheng, Guanghui
Bu, Wenjun
Mechanical characteristics analysis and control algorithm for floating raft system with mass variation
title Mechanical characteristics analysis and control algorithm for floating raft system with mass variation
title_full Mechanical characteristics analysis and control algorithm for floating raft system with mass variation
title_fullStr Mechanical characteristics analysis and control algorithm for floating raft system with mass variation
title_full_unstemmed Mechanical characteristics analysis and control algorithm for floating raft system with mass variation
title_short Mechanical characteristics analysis and control algorithm for floating raft system with mass variation
title_sort mechanical characteristics analysis and control algorithm for floating raft system with mass variation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10257668/
https://www.ncbi.nlm.nih.gov/pubmed/37301935
http://dx.doi.org/10.1038/s41598-023-36661-9
work_keys_str_mv AT shiliang mechanicalcharacteristicsanalysisandcontrolalgorithmforfloatingraftsystemwithmassvariation
AT chengguanghui mechanicalcharacteristicsanalysisandcontrolalgorithmforfloatingraftsystemwithmassvariation
AT buwenjun mechanicalcharacteristicsanalysisandcontrolalgorithmforfloatingraftsystemwithmassvariation