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26th Annual International Ocean and Polar engineering Conference, ISOPE 2016

作者： Lin, Chin-Yu Lin, Jia-Hong Chu, Tung-Liang Huang, Chin-Cheng Mechanical and System Engineering Program Institute of Nuclear Energy Research Taoyuan City Taiwan

ISBN: (纸本)9781880653883

This paper is to perform the structural analysis for support structure of offshore wind turbine under Taiwan's local environmental conditions such as earthquake and site specific soil properties. The analyzed support structure including tower, transition piece, jacket substructure, and pile foundation is modeled in SAP2000 for a specific offshore wind demonstration site with water depth of 30 m. The forces and moments are first calculated by the NREL FAST software which is primarily employed to analyze the dynamic responses of the entire offshore wind turbine (OWT) structure designed against severe design load cases. Subsequently, the calculated forces and moments are applied to the tower top and the limiting strengths of structural members are thus evaluated using the API RP 2A-WSD standard. In this paper, the extreme external conditions of wind, wave, sea current and 0.31g of design earthquake based on local seismic design requirement are taken into account. Also, the effects of pile-soil interaction associated with different boundary conditions of fixed end and soil springs are considered in the simulation models. The present results show that the analyzed support structure of offshore wind turbine can be fully in compliance with the requirements of API standard when taking the available local environmental conditions into account. This paper will be helpful for the safe and reliable operation of offshore wind turbine in Taiwan in the near future. © Copyright 2016 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Offshore wind turbines

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Numerical Fatigue Analysis for Jacket-type Substructure of Offshore Wind Turbines under Local Environmental Conditions in Taiwan 28

Numerical Fatigue Analysis for Jacket-type Substructure of O...

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28th International Ocean and Polar engineering Conference, ISOPE 2018

作者： Fan, Ting-Yu Lin, Chin-Yu Huang, Chin-Cheng Chu, Tung-Liang Mechanical and System Engineering Program Institute of Nuclear Energy Research Taoyuan City Taiwan

ISBN: (纸本)9781880653876

This paper is to perform a series of fatigue analyses for reference offshore wind turbine (OWT) under Taiwan local environmental conditions to investigate the potential design load cases (DLCs) which could affect the overall calculation procedure and improve the design calculation efficiency. Based on sequentially coupled approaches, NREL FAST and ANSYS software are employed to analyze the dynamic responses of offshore wind turbine system and jacket-type substructure under various DLCs defined in the international standard IEC 61400-3. The stress distributions around the intersection of tubular joints under the axial, in-plane and out-of-plane loads are computed to determine the stress concentration factors. Using conventional Rainflow counting algorithm, the cumulative fatigue damage (CFD) factors for tubular joints can be thus calculated with S-N curves and Palmgren-Miner's rule. The computed results show fatigue damage caused by power production design scenario is more dominant and accounting for the ratio of total cumulative fatigue damage up to 90%. This work with more efficient load calculation procedure (LCP) in preliminary design will be helpful for cost assessment and selection of adequate types of substructures to be utilized in future offshore wind farms in Taiwan. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Offshore wind turbines

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Fatigue analysis for jacket-type support structure of offshore wind turbine under local environmental conditions in Taiwan 27

Fatigue analysis for jacket-type support structure of offsho...

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27th International Ocean and Polar engineering Conference, ISOPE 2017

作者： Fan, Ting-Yu Huang, Chin-Cheng Chu, Tung-Liang Mechanical and System Engineering Program Institute of Nuclear Energy Research Taoyuan City Taiwan

ISBN: (纸本)9781880653975

This paper is to perform fatigue analysis of the jacket-type support structure for NREL 5MW reference offshore wind turbine (OWT). As a successive work to the preceding support structure design of the NREL 5MW offshore wind turbine subjected to Taiwan local environments, this paper presents a practical and efficient approach for fatigue analysis of the jacket-type support structure under wind, wave loads and their combinations. The effects of wind directions on high cycle fatigue of the jacket-type support structure are also taken into account in this work. Using the separate global and local analyses, the NREL FAST software is first employed to analyze the dynamic response of integrated offshore wind turbine and support structure under various design load cases defined in the GL guidelines. The obtained shear forces, axial forces and bending moments at tower top are then used to perform subsequent local analysis of fatigue in time domain with ANSYS software. Using Rainflow counting algorithm, stress amplitudes and corresponding numbers of cycles can be further obtained. The cumulative fatigue damage factors can be thus calculated with S-N curves and Palmgren-Miner's rule. The computed results show higher fatigue damage factors at some locations near tower top and bottom of the jacket-type support structure, and it is also found that wind load is more dominant. Further, the effects of wave loads and the combination of wave and wind loads are also noted. Accounting for the local environments in Taiwan, the engineering study on fatigue analysis will be helpful to ensure the long term operation safety of offshore wind turbine and support structures in the future. Copyright © 2017 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Offshore wind turbines

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Dynamic load analysis for offshore wind turbine with flexible bottom condition under earthquake loading 26

Dynamic load analysis for offshore wind turbine with flexibl...

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26th Annual International Ocean and Polar engineering Conference, ISOPE 2016

作者： Lai, Wen-Jeng Su, Wei-Nian Huang, Chin-Cheng Mechanical and System Engineering Program Institute of Nuclear Energy Research Taoyuan City Taiwan

ISBN: (纸本)9781880653883

Some offshore wind turbines might be constructed in seismically active regions, the impact of earthquake loading on design and operation of offshore wind turbines has to be taken into consideration. Site-specific environmental conditions such as earthquake and soil are crucial for the performance and structural integrity of offshore wind turbines. This work is to present dynamic load analyses for the NREL 5MW reference offshore wind turbine with monopile support structure subjected to earthquake loadings. The horizontal earthquake loadings are applied to the reference offshore wind turbine at different operation conditions. The FAST code is chosen as the analysis tool and is further recompiled to study the earthquake and soil effects. The computed results show the importance of flexibility of support structure bottom on the optimization of offshore wind turbine and support structure design. The dynamic load analyses performed in this study will provide the insights into the local offshore wind turbine and support structure design. © Copyright 2016 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Dynamic loads

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A comparative study of the API and NORSOK standards apply to design analysis for an offshore wind turbine with jacket support structure 25

A comparative study of the API and NORSOK standards apply to...

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25th International Ocean and Polar engineering Conference, ISOPE 2015

作者： Lin, C.Y. Huang, C.C. Wu, T.Y. Institute of Nuclear Energy Research Mechanical and System Engineering Program Taoyuan City Taiwan

ISBN: (纸本)9781880653890

This paper is to perform the Jacket support structure design analysis for a 5MW reference offshore wind turbine of IEA OC4 project using API RP 2A-WSD and NORSOK N-004 design standards. The analysis is conducted by a global-local structural analysis scheme. In global analysis, the NREL FAST code is employed to analyze the dynamic responses of entire OWT structure under severe design load cases of IEC 61400-3. The tower base forces and moments are thus calculated and then used as the input of SAP2000 to conduct the Jacket support structural analysis, and then the member and joint strength checks are performed using the API and NORSOK standards, respectively. Totally 9 severe design load cases are considered in this work. The results show that the analyzed Jacket structure is fully in compliance with the requirements of API and NORSOK standards. In addition, it reveals that the NORSOK standard provides slightly more safety margin than API. Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Offshore wind turbines

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Lateral force analysis of an acoustic levitated plate using boundary element method 25

Lateral force analysis of an acoustic levitated plate using ...

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25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018

作者： Matsumoto, Kosuke Masuda, Arata Kyoto Institute of Technology Master Program of Mechanical and System Engineering Kyoto Japan Kyoto Institute of Technology Mechanical Engineering Kyoto Japan

ISBN: (纸本)9781510868458

In this study, the lateral force acting on an acoustically levitated plate in a near-field acoustic levitation setup is numerically analyzed to understand the in-plane behavior of the levitated plate. A vibrating surface in a ultrasound frequency can levitate a planer object by the effect of the acoustic pressure radiated from the surface. This is called near-field acoustic levitation. At the same time, the sound pressure distribution in the air gap between the radiation surface and the levitated plate generates an acoustic streaming which yield the acoustic viscous stress on the surface of the levitated plate. The resulting force and torque acting on the levitated plate governs the stability and the in-plane motion of the plate. In this paper, the force acting on the levitated plate is calculated by integrating the acoustic viscous stress which is derived through the Nyborg's formulation of the acoustic streaming and the sound field analysis using the boundary element method (BEM), which can properly take account of the effect of the infinite medium. The validity of the calculation is verified by comparing the calculated force with experimental results reported in the *** dependence of the force on the lateral position of the levitated plate is then discussed in terms of the in-plane stability. © 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. All rights reserved.

关键词： Boundary element method

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Distributed Observer Approach for Scalable Formation Control of Multi-Agent Network

Distributed Observer Approach for Scalable Formation Control...

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2020 International Seminar on Intelligent Technology and Its Application, ISITIA 2020

作者： Djamari, Djati Wibowo Fikri, Muhamad Rausyan Mechanical Engineering Study Program Sampoerna University Jakarta Indonesia Information System Study Program Sampoerna University Jakarta Indonesia

ISBN: (纸本)9781728174136

This work studies formation control of Multi-Agent systems (MASs) where its formation size is scalable via a scaling factor (scalable formation). Previous works on scalable formation are limited to either fixed undirected graph or fixed directed graph with p-rooted graph condition. This work proposes a novel distributed algorithm for scalable formation based on a distributed observer to estimate agents' positions. The novel algorithm results in a new matrix, a Laplacian matrix with additional diagonal terms, where the desired formation pattern is embedded in this diagonal terms. With the proposed algorithm, only spanning tree condition is needed as the necessary and sufficient condition to achieve the scalable formation. Numerical examples are shown to illustrate the proposed method. © 2020 IEEE.

关键词： Directed graphs

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Analysis of the Reduction of Vibration and Chatter Effect in Boring Process Due to the Addition of Spring Radial Vibration Damper (SRVD) on the Workpiece 5th

Analysis of the Reduction of Vibration and Chatter Effect in...

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5th International Conference on mechanical engineering, ICOME 2021

作者： Hendrowati, Wiwiek Iswanda, Mumtaza Rizky Laboratory of Vibration Engineering and Automotive System Department of Mechanical Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia Graduate Program of Mechanical Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia

ISBN: (纸本)9789811908668

Modern machining processes have been rapidly evolving into much more sophisticated forms. However, even with such sophistication in hand, the effect of chatter remains to be a significant problem. To date, engineers keep referring to the traditional chatter stability lobe to address the problem of limiting themselves in creativity to achieve high efficiency. The research aims to observe the vibration reduction along the boring process achieved by adding one type of DVA called Spring Radial Vibration Damper (SRVD) onto the workpiece. The workpiece is a cylindrical rod with the ratio of overhang length to a diameter at 6:1. The experiment conducted in different depths of cut (DoC) varies at 0.25 mm, 0.2 mm, and 0.15 mm. The experiment results show a comparison between the main system and without the SRVD in a graphical representation of the dynamic response, percentage of RMS reduction in each parameter, and surface finish of each parameter. This paper concludes that SRVD can be beneficial for the cutting process within the unstable area of the chatter stability lobe. It will worsen the cutting process if the parameters still lie within the stable area. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Vibration analysis

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Bioinspired magnetic cilia:from materials to applications

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Microsystems & Nanoengineering 2023年第6期9卷 107-128页

作者： Seongjin Park Geonjun Choi Minsu Kang Woochan Kim Jangho Kim Hoon Eui Jeong Department of Mechanical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Department of Convergence Biosystems Engineering Chonnam National UniversityGwangju61186Republic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju61186Republic of Korea

Microscale and nanoscale cilia are ubiquitous in natural systems where they serve diverse biological *** artificial magnetic cilia have emerged as a highly promising technology with vast potential applications,ranging from soft robotics to highly precise *** this review,we comprehensively discuss the roles of cilia in nature and the various types of magnetic particles utilized in magnetic cilia;additionally,we explore the top-down and bottom-up fabrication techniques employed for their ***,we examine the various applications of magnetic cilia,including their use in soft robotics,droplet and particle control systems,fluidics,optical devices,and ***,we present our conclusions and the future outlook for magnetic cilia research and development,including the challenges that need to be overcome and the potential for further integration with emerging technologies.

关键词： magnetic overcome precise

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Analysis of Vibration Characteristics Due to the Effect of Adding Rubber Radial Vibration Damper (RRVD) to the Boring Process 5th

Analysis of Vibration Characteristics Due to the Effect of A...

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5th International Conference on mechanical engineering, ICOME 2021

作者： Hendrowati, Wiwiek Daman, Aida Annisa Amin Guntur, Harus Laksana Darmawan, Fuad Adi Laboratory of Vibration Engineering andAutomotive System Department of Mechanical Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Undergraduate Program of Mechanical Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia

ISBN: (纸本)9789811908668

There will be vibrations caused by friction between the rotating workpiece and the insert on the boring bar during the boring process. Vibrations that occur in the workpiece can be suppressed with a Dynamic Vibration Absorber (DVA). Therefore, the boring process produces a rough surface and damages the components of the lathe. In this research, DVA is placed on a workpiece by utilizing force damping in the radial direction and it is called as Rubber Radial Vibration Damper (RRVD) with rubber as a damping element. An analysis of the effect of RRVD addition on the vibration reduction response of the workpiece was carried out. The variations in this study are mass of RRVD (AISI 4340 and Copper Alloy), cutting parameters, and the ratio of length per diameter (L/D) of the workpiece overhang 7, 8, and 9. The simulation results showed that the main system's highest natural frequency and amplitude occurred at the L/D 7 without RRVD or with RRVD. In addition, the RRVD Copper Alloy mass variation has a lower natural frequency and amplitude than the AISI 4340. Based on this research, it was found that the most stable and well-reduced system was in the main system with L/D 8 and using RRVD Copper Alloy mass. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Vibration analysis

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