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Underwater Hydrodynamics and Vibration
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Underwater Hydrodynamics and Vibration

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Marine Science and Engineering".

Deadline for manuscript submissions: closed (31 May 2024) | Viewed by 848

Special Issue Editors

Dr. Zhenwei Huang

E-Mail Website
Guest Editor
School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: fluid mechanics; cavitating flow; vibration and noise control
Prof. Dr. Jianhong Ye

E-Mail Website
Guest Editor
Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
Interests: marine engineering geology; marine/offshore geotechnics; coral reef geotechnics; Fluid-Structure-Seabed Interaction (FSSI); computational geomechanics and FEA software development; wave/earthquake dynamic stability of offshore turbines
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Special Issue Information

Dear Colleagues,

Underwater structures and systems face unique challenges due to the complex interplay of hydrodynamics and vibrations in aquatic environments. These challenges are encountered across various domains, including offshore engineering, marine technology, and underwater vehicle design. Understanding the intricate dynamics between underwater structures and the surrounding fluid is essential for the safe and efficient operation of marine systems.

This Special Issue, titled "Underwater Hydrodynamics and Vibration", delves into the dynamic interactions between underwater structures and the surrounding fluid environment. It explores a wide range of topics, including hydrodynamic forces on submerged objects, vibration analysis of underwater systems, and the effects of water flow on marine structures. Researchers and experts contribute their insights into the challenges and advancements in understanding the complex hydrodynamic phenomena that impact offshore engineering, marine technology, and underwater vehicle design. By investigating these complex phenomena, this Special Issue aims to advance our understanding of underwater hydrodynamics and vibration and their applications in various domains.

Dr. Zhenwei Huang
Prof. Dr. Jianhong Ye
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • underwater hydrodynamics
  • vibration analysis
  • marine structures
  • hydrodynamic forces
  • fluid–structure interaction
  • offshore engineering
  • underwater technology
  • marine vehicles

Published Papers (2 papers)

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Research

20 pages, 8675 KiB  
Article
Research on the Dynamic Response Characteristics of the Propulsion Shaft System with an On-Shaft Generator in Ships
by Yukuo Guo, Ruiping Zhou, Zhaozhao Ma, Jianzheng Wang and Longqi Ding
Appl. Sci. 2024, 14(15), 6769; https://doi.org/10.3390/app14156769 - 2 Aug 2024
Viewed by 271
Abstract
The propulsion shaft system, as the core of the ship’s power system, has attracted widespread attention in terms of vibration. This paper is dedicated to the study of the dynamic response characteristics of the ship propulsion shafting system, with a particular focus on [...] Read more.
The propulsion shaft system, as the core of the ship’s power system, has attracted widespread attention in terms of vibration. This paper is dedicated to the study of the dynamic response characteristics of the ship propulsion shafting system, with a particular focus on the impact of the shaft-driven generator supported by bearings on the dynamic torque of the shafting system. A classic lumped-parameter equivalent system model is adopted, and the time domain transient response simulation calculation is conducted based on the Newmark-β method. A comprehensive analysis is made of the vibration torque and vibration stress in the propulsion shaft system under different rotational speeds and working conditions, with or without the shaft-driven generator connected to the load. Dynamic vibration torque measurements are also taken on a 16100TEU ship for the propulsion shaft system to analyze the consistency between simulation results and experimental results. The results show that at the rated speed of the main engine at 80 rpm and adjacent speeds, the error between the simulation calculation results and the actual measured torque results at the pre- and post-motor measurement points is less than 10% and is much less than the continuous allowable torque of 4.01 × 106 N·m and the instantaneous torque. This installation state, including the propulsion shaft system with the shaft-driven generator supported by bearings, can safely navigate during normal operation. This provides theoretical and experimental support for the future installation of the propulsion shaft system with the shaft-driven generator supported by bearings. In addition, the actual ship experiment enhances the universality and reliability of the research. Full article
(This article belongs to the Special Issue Underwater Hydrodynamics and Vibration)
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22 pages, 8706 KiB  
Article
Motion Response of the Submersible Underwater Towed System as Cable Length Changes
by Zhibo Wang and Peiyun Kong
Appl. Sci. 2024, 14(15), 6503; https://doi.org/10.3390/app14156503 - 25 Jul 2024
Viewed by 260
Abstract
Submersible underwater towed systems usually need to transition from steady-state motion to maneuvering motion during operation while dynamically adjusting the length of the towed cable. The lumped mass approach was employed to convert the dragged cable into a model with a concentrated mass. [...] Read more.
Submersible underwater towed systems usually need to transition from steady-state motion to maneuvering motion during operation while dynamically adjusting the length of the towed cable. The lumped mass approach was employed to convert the dragged cable into a model with a concentrated mass. Analyzed utilizing a computational simulation tool, the motion response of the towed system was examined for both simple and composite maneuvering motions. By comparing the changes in tension at the end of the towed cable and the depth of the towed body motion under different motion states and cable retraction and deployment speeds, the motion response law of the system when the length of the towed cable changes during the submarine maneuver motion is obtained. The maximum tension value occurred at 1.0 m/s during the acceleration maneuver when the velocity change of the submersible ended at the same time as the cable length change. After the deployment maneuver in a circular rotating motion, the range of tension fluctuations decreased by 93%, greatly improving the stability of the towed system. An analysis was conducted to examine the impact of various motion and structural parameters on the motion response. The study revealed that the buoyancy-to-gravity ratio of the towed body, the acceleration time of the accelerated motion, and the rotational speed of the circular rotational motion had a notable influence on the outcomes. When the buoyancy-to-gravity ratio of the towed body is 1.0, the maximum tension value of the towed cable is minimized, and the depth change of the towed body is closer to 0 m. Full article
(This article belongs to the Special Issue Underwater Hydrodynamics and Vibration)
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