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Articles 1 - 30 of 45
Full-Text Articles in Engineering
Modified Pid Controller Design For Active Transverse Anti-Rolling System For Ships With Low Roll Motion, Hsing-Cheng Yu, Jhih-Jyun You
Modified Pid Controller Design For Active Transverse Anti-Rolling System For Ships With Low Roll Motion, Hsing-Cheng Yu, Jhih-Jyun You
Journal of Marine Science and Technology
Multi-domain physical modeling software with an intuitive simulation methodology using MapleSim was adopted in this study to create a rigid body structure model of an active transverse anti-rolling system (ATARS) of a container ship. At the same time, a ship stability analysis was also conducted to determine the force model, dynamic equilibrium, and motion behavior of the ATARS of the container ship. Once various external transverse force generated by waves impact varied roll angles of the ATARS on the vessel, a modified proportional-integral-derivative (PID) controller designed to improve the capability of the active stabilizer fins used in the ATARS is …
The Nonlinear Dynamics And Anti-Sway Tracking Control For Offshore Container Crane On A Mobile Harbor, You-Gang Sun, Hai-Yan Qiang, Junqi Xu, Da-Shan Dong
The Nonlinear Dynamics And Anti-Sway Tracking Control For Offshore Container Crane On A Mobile Harbor, You-Gang Sun, Hai-Yan Qiang, Junqi Xu, Da-Shan Dong
Journal of Marine Science and Technology
The offshore container crane (OCC), as a novel maritime container transfer system, can handle container from a large container-ship anchored in open sea to address the congestion and limited water-depth of port. However, for the wave- and wind-induced movements of the ship, the crane's control system should be redesigned to ensure the load transfer on the sea. In this paper, we derive the nonlinear dynamic equations of OCC system subjected to the ship motions based on dynamic analysis. Then a double-layer sliding manifold is constructed to realize the position tracking and sway control simultaneously, irrespective of ship motions and parameters …
Cascaded Uuv Trajectory Tracking Control Based On Model Predictive And Sliding Mode Control, Bing Sun, Wenyang Gan, Man Mei, Daqi Zhu, Simon X Yang
Cascaded Uuv Trajectory Tracking Control Based On Model Predictive And Sliding Mode Control, Bing Sun, Wenyang Gan, Man Mei, Daqi Zhu, Simon X Yang
Journal of Marine Science and Technology
This paper describes a cascaded dynamic trajectory tracking control approach based on model predictive control (MPC) and sliding mode control for unmanned underwater vehicles (UUVs). The proposed method combines kinematic and dynamic controllers to achieve robust control. First, MPC is employed to realize tracking control kinematically. The MPC algorithm is proposed as a solution to the speed jump problem. Considering the computational burden for nonlinear UUV dynamic models, the MPC method is used in conjunction with sliding mode control to achieve dynamic tracking control, which solves problems of modeling uncertainty and external disturbances. Experimental results showed that the proposed method …
Simulation And Motion Analysis Of Deepwater Manifold Lifting, Zhiwei Chen, Tingdi Zhao, Jian Jiao, Dongfeng Mao
Simulation And Motion Analysis Of Deepwater Manifold Lifting, Zhiwei Chen, Tingdi Zhao, Jian Jiao, Dongfeng Mao
Journal of Marine Science and Technology
The development and utilization of oil and gas resources has expanded to deep water. The installation of a subsea manifold is crucial for developing offshore oil-gas fields. In this study, we used the lifting installation method (LIM) to install a subsea manifold. First, the appropriate environmental parameters were selected through the analysis of environmental loads at the Liwan 3-1 Gasfield in the South China Sea. The wind and wave spectra were selected using noise power density and Joint North Sea Wave Project spectra, respectively. The entire lifting and installation system that responds to environmental loads comprised a vessel, cable, and …
Energy Efficient Trajectory Design For The Underwater Vehicle With Bounded Inputs Using The Global Optimal Sliding-Mode Control, Mai The Vu, Hyeung-Sik Choi, Jin-Il Kang, Dae-Hyung Ji, Hyun Joong
Energy Efficient Trajectory Design For The Underwater Vehicle With Bounded Inputs Using The Global Optimal Sliding-Mode Control, Mai The Vu, Hyeung-Sik Choi, Jin-Il Kang, Dae-Hyung Ji, Hyun Joong
Journal of Marine Science and Technology
In this paper, we propose a novel global sliding mode controller (SMC) for an uncertain linear time-varying second order system. The proposed controller was implemented on the underwater vehicle (UV) with uncertainty of bounded parameters and disturbances within limited control input. By applying the proposed controller to the second-order UV system, the arrival time at the reference position and the maximum allowable acceleration are expressed in a closed-form equation if ranges of parametric uncertainties and reference inputs are specified. The closed-form equation can be utilized in designing the capacity of vehicle systems with the condition of the minimum arrival time …
Survey Of Trajectory Tracking Control Of Autonomous Underwater Vehicles, Wen-Yang Gan, Da-Qi Zhu, Wei-Li Xu, Bing Sun
Survey Of Trajectory Tracking Control Of Autonomous Underwater Vehicles, Wen-Yang Gan, Da-Qi Zhu, Wei-Li Xu, Bing Sun
Journal of Marine Science and Technology
Autonomous underwater vehicles (AUVs) are powerful instruments that enable the exploration of the ocean. In recent years, AUVs have been developed considerably. Trajectory tracking control, which has been a major research focus for many decades due to its variety of applications, is one of the key advancements in the AUV technology. This paper presents six trajectory tracking control methods: PID (proportion integration differentiation) control, fuzzy control, adaptive control, sliding mode control, backstepping control, and neural network control. A few novel methods for trajectory tracking control are also introduced. First, the concept of trajectory tracking control for an AUV and the …
Cost Of Salvage?€“ A Comparative Form Approach, Chung-Sheng Chiu, Chung-Ping Liu, Ki-Yin Chang, Wen-Jui Tseng, Yung-Wei Chen
Cost Of Salvage?€“ A Comparative Form Approach, Chung-Sheng Chiu, Chung-Ping Liu, Ki-Yin Chang, Wen-Jui Tseng, Yung-Wei Chen
Journal of Marine Science and Technology
The most important principle of salvage is the "No Cure-No Pay" basis, if there is no recovery, there is no payment, whatever the expense of the operation. However, this principle has changed in recent years to reflect the public interest in prevention of damage to the environment (Mudric, 2010). The salvor can now contract in such a way that he is shielded from loss when responding to high risk or low value casualties (so called as "No Cure-Some pay"). Salvage is a high-profit business and high-risk as well in the world. The case of the Costa Concordia - by no …
Experimental Study Of Dynamic Stability Of Underwater Vehicle-Manipulator System Using Zero Moment Point, Jin-Il Kang, Hyeung-Sik Choi, Mai The Vu, Nguyen Ngoc Duc, Dae-Hyeong Ji, Joon-Young Kim
Experimental Study Of Dynamic Stability Of Underwater Vehicle-Manipulator System Using Zero Moment Point, Jin-Il Kang, Hyeung-Sik Choi, Mai The Vu, Nguyen Ngoc Duc, Dae-Hyeong Ji, Joon-Young Kim
Journal of Marine Science and Technology
For manipulative underwater operations, an underwater vehiclemanipulator system (UVMS) has more degrees of freedom than those required to conduct a given mission. To follow the desired end-effector position and velocity accurately, UVMS should be able to generate trajectories of manipulators and the underwater vehicle can maintain dynamic stability of the entire system. In this paper, redundancy resolution is performed to find a solution satisfying the given task among many joint-space solutions. Also, to improve the dynamic stability of the UVMS, zero moment point (ZMP) is adopted such that it requires some constraints. For application of UVMS, a joint limitation is …
Dynamic Response Analysis Of Micro-Grid With Ocean Thermal Energy Conversion, Chia-Yu Hsu, Ming-Wang Chen, Pei-Hwa Huang
Dynamic Response Analysis Of Micro-Grid With Ocean Thermal Energy Conversion, Chia-Yu Hsu, Ming-Wang Chen, Pei-Hwa Huang
Journal of Marine Science and Technology
The main purpose of this paper is to analyze the dynamic responses of micro-grid with Ocean Thermal Energy Conversion (OTEC) system. The power sources of the studied micro-grid system include an OTEC generator and a wind generator. Three different types of OTEC generation systems, i.e., open-cycle, closed-cycle, and hybrid-cycle, are considered, under the conditions with the same temperature of sea water and output of generator. When the system operates in an islanding or gridconnected mode, the responses subject to load variation are quite different. As the system operates in the grid-connected mode, the voltage and frequency are less affected by …
Research On Integration And Sharing Solutions For Big Structured Data For The Marine Environment, Wei Wang, Wenfang Cheng, Jing Chen, Ya-Nan Yu, Jianxun Zhang
Research On Integration And Sharing Solutions For Big Structured Data For The Marine Environment, Wei Wang, Wenfang Cheng, Jing Chen, Ya-Nan Yu, Jianxun Zhang
Journal of Marine Science and Technology
The data-intensive science, a new paradigm in scientific discovery, demands an urgent solution to integrate and share big marine environment data. Through the modeling of marine environmental features (such as Temperature, Salinity, Density et al.), a novel solution is presented in this paper. This solution employs Hadoop and Hbase, based on the Bigtable algorithm first proposed by Google Inc. By using hierarchical technology, scalability of the data integration framework is realized. Additionally, an efficient execution of various queries is realized by using the customized auxiliary index algorithm. In the experimental cluster environment constructed from four ordinary personal computers, experiments involving …
Strength Analysis For The Rudders Of Power-Free Underwater Vehicle In Kuroshio Subjected To Typhoon Waves, Chuan-Tsung Lee, Ray-Yeng Yang, Huang Hsing Pan, Li-An Kuo
Strength Analysis For The Rudders Of Power-Free Underwater Vehicle In Kuroshio Subjected To Typhoon Waves, Chuan-Tsung Lee, Ray-Yeng Yang, Huang Hsing Pan, Li-An Kuo
Journal of Marine Science and Technology
In this study, a 1/25 hydraulic model of a power-free vehicle was developed. Typhoon waves and Kuroshio current flow in a wave-current flume (200 x 2 x 2 m3 ) were applied to the model for determining the net flow velocity and mooring forces. Through hydraulic experiments with a wave period of 16 s, wave height of 10 m, and ocean current speed of 1.0 m/s, a net flow velocity of up to 3.81 m/s was measured. The maximum lift and drag forces acting on each rudder were calculated through computational fluid dynamics as -245.6 and 151.6 kN, respectively, when …
Experimental Assessment Of Suspended Sediment Concentration Changed By Solitary Wave, Jae-Nam Cho, Chang-Geun Song, Kyu-Nam Hwang, Seung-Oh Lee
Experimental Assessment Of Suspended Sediment Concentration Changed By Solitary Wave, Jae-Nam Cho, Chang-Geun Song, Kyu-Nam Hwang, Seung-Oh Lee
Journal of Marine Science and Technology
A large scale solitary wave causes a lot of sediment transportation and coastal beach erosion, for example tsunami is the one type of solitary waves. During passing such solitary wave over coastal region, higher energy on sediment transportation near bottom would bring to massive geomorphological changes and even worse damages in life and economics. The major objective of this study is to analyze the incipient motion of sediment suspended from bottom by a solitary wave through hydraulic experiments and numerical simulations. First, to estimate the process of sediment transport the experimental study was carried out in the prismatic rectangular channel …
Numerical Computation Of The Transient Salinity Distribution In A Macro-Tidal Estuary, Seung Oh Lee, Chang Geun Song
Numerical Computation Of The Transient Salinity Distribution In A Macro-Tidal Estuary, Seung Oh Lee, Chang Geun Song
Journal of Marine Science and Technology
In this study, the flow reversal and salinity distribution associated with tidal effects were investigated at a macro-tidal estuary located in tidal range of the Yellow Sea in South Korea. A 2-D hydrodynamic model (RMA-2) and a 2D advectiondispersion model (RAM4) were employed to simulate flow behavior and salinity distribution, respectively. The results showed that reverse flow occurred five times over 3-day period and the maximum reverse flow extended over 32.9 km upstream. Salinity distribution was obtained by estimating the salinity input with analytical solution of advection-dispersion equation. The total length of the saline wedge calculated from numerical simulation was …
Investigation Of Effects Of Wave Directions On Hull Wave Loads By Hydroelastic Experimental Method, Zhanyang Chen, Jialong Jiao
Investigation Of Effects Of Wave Directions On Hull Wave Loads By Hydroelastic Experimental Method, Zhanyang Chen, Jialong Jiao
Journal of Marine Science and Technology
This paper focuses on the hydroelastic responses of ultralarge vessels under different wave directions. Segmented ship model experiments provide an invaluable tool in naval applications. However, most model tests are performed on heading waves. Therefore, a segmented model with variable cross-section steel backbones was designed and the oblique wave tests were performed in a comprehensive test tank. The oblique wave test system was introduced in detail. Time histories of bending moments in oblique waves were given. In order to analyze the influence of structural elastic effect on hydroelastic responses, the number of segments of the model was changed, and the …
Determination Of Vertical Datum Level For Tidal Bench Mark Using Gnss Buoy Observations, Jae Young Roh, Kyung Wan Yoo, Yong Cheol Suh, Moon Seung Shin, Dong Ha Lee
Determination Of Vertical Datum Level For Tidal Bench Mark Using Gnss Buoy Observations, Jae Young Roh, Kyung Wan Yoo, Yong Cheol Suh, Moon Seung Shin, Dong Ha Lee
Journal of Marine Science and Technology
Coastal areas are the most vulnerable areas to sea level fluctuations. Such areas comprise approximately 4% of South Korea's total land; therefore, monitoring these fluctuations is crucial. The present study determined the vertical datum level using a global navigation satellite system (GNSS). Unlike traditional sea level measurements, which are performed using fixed-type gauge observations, a GNSS has an accuracy of a few millimetres and no spatiotemporal constraints. For this purpose, a set of buoys containing GNSS devices was installed in coastal waters, and observations were performed for more than 8 h. The processed GNSS buoy data were compared with tidal …
Real-Time Method For Calculating Retardation Functions, Li-Hao Yuan, Yue-Sheng Ma, Ying-Fei Zan, Zhao-Hui Wu
Real-Time Method For Calculating Retardation Functions, Li-Hao Yuan, Yue-Sheng Ma, Ying-Fei Zan, Zhao-Hui Wu
Journal of Marine Science and Technology
To meet the demand for real-time calculation of time-domain motion equations, a state-space model was established to replace the convolution integral method to improve computational efficiency. On the basis of the HYSY201 vessel, the impulse response curve fitting method and the realization theory method based on the time-domain identification theory were compared to establish the state-space model. The results of roll decay simulation conducted using the state-space model and the convolution integral method were verified against decay test results. The simulation results for retardation function, radiation forces, and motion time histories calculated using the state-space model and the convolution integral …
Modeling Of Dynamic Behavior For Port Structures Using The Performance-Based Seismic Design, Cheng-Yu Ku, Jing-Jong Jang, Jui-Ying Lai, Ming-Jr Hsieh
Modeling Of Dynamic Behavior For Port Structures Using The Performance-Based Seismic Design, Cheng-Yu Ku, Jing-Jong Jang, Jui-Ying Lai, Ming-Jr Hsieh
Journal of Marine Science and Technology
The paper presents a pioneer study on numerical modeling of dynamic behavior for port structures using the performancebased seismic design in Taiwan. Since Taiwan is located in earthquake prone area, there is significant interest in improving prediction of the behavior of port structures subjected to seismic loading. The investigation of port structures using three different analysis methods including the simplified analysis, the simplified dynamic analysis, and the dynamic analysis were adopted for evaluating the performance of the cellular quay wall and sheet pile quay wall. In addition, the effective stress analysis with the consideration of the pore pressure generation and …
A Numerical Model For Pipeline Abandonment In Deep Water, Duanfeng Han, Kuo Huang, Yingfei Zan, Zhaohui Wu
A Numerical Model For Pipeline Abandonment In Deep Water, Duanfeng Han, Kuo Huang, Yingfei Zan, Zhaohui Wu
Journal of Marine Science and Technology
In offshore oil and gas engineering, pipeline abandonment is unavoidable and its mechanical analysis is necessary and important. For this problem, a numerical model is developed in this study to evaluate pipeline abandonment for the J-laying method. The whole system considered in this model is divided into two parts: the A&R cable and the pipeline in the water. A catenary model was proposed for the former, and the latter is solved by a numerical iterative method. In addition to the boundary conditions at the two end points, a special set of boundary conditions is required at the junction that connects …
A Time-Domain Numerical Tool For A Wave Energy Attenuator With The Sph Method, Da-Wei Chen, Shuichi Nagata, Shiaw-Yih Tzang, Yasutaka Imai, Chih-Min Hsieh, Jiahn-Horng Chen
A Time-Domain Numerical Tool For A Wave Energy Attenuator With The Sph Method, Da-Wei Chen, Shuichi Nagata, Shiaw-Yih Tzang, Yasutaka Imai, Chih-Min Hsieh, Jiahn-Horng Chen
Journal of Marine Science and Technology
The wave energy attenuator is a floating device which operates perpendicular to the wave fronts and captures wave energy from the relative motions of two hinged floaters as waves passing by them. For establishing the time-domain numerical tools to evaluate the performance of a wave energy attenuator, a Smoothed Particle Hydrodynamic (SPH) model with mesh-free method was adopted to simulate the hydrodynamic behaviors of each floating object. Three different wave heights of 6 cm, 7 cm, and 10.4 cm of the same period of 1.22 s were commonly derived from typical potential oceanic zones offshore Taiwan and Japan. Comparisons of …
Cyclic Shear Behavior Characteristics Of Marine Silty Sand, Su Won Son, Min Jae Ko, Jin Man Kim
Cyclic Shear Behavior Characteristics Of Marine Silty Sand, Su Won Son, Min Jae Ko, Jin Man Kim
Journal of Marine Science and Technology
Owing to the high demand for energy supply, the use of offshore wind turbines as a renewable and environment-friendly energy source has been remarkably increased. After installation in the ocean, the offshore structure foundations and soil that support them are subjected to cyclic loading from wind and waves. In this study, laboratory experiments were conducted to evaluate the shear behavior characteristics of the marine soil subjected to cyclic loading. Utilizing a cyclic direct simple shear (CDSS) test apparatus, the undrained shear failure behavior of marine silty sand was investigated. The results show that the cyclic behavior and permanent shear strain …
A Simplified Analytical Method For Estimating Flow-Induced Vibration Responses Of Hydraulic Structures Caused By Flow Fluctuation, Ya-Chao Wu, Lu Lu, Qin-Man Fan, Yun Dong, Chun-Yuan Zuo
A Simplified Analytical Method For Estimating Flow-Induced Vibration Responses Of Hydraulic Structures Caused By Flow Fluctuation, Ya-Chao Wu, Lu Lu, Qin-Man Fan, Yun Dong, Chun-Yuan Zuo
Journal of Marine Science and Technology
In many hydraulic engineering investigations of flow-induced vibration responses, a model test is necessary but yet expensive. In this article, an equilibrium equation between the operation of fluctuating pressure and the work done by damping is established to provide a simplified analytical method for estimating the flow-induced vibration responses of hydraulic structures caused by water flow fluctuations. This approach is based on the Westergaard solution. The flow-induced vibration of water flowing around a dividing wall, the flood discharge vibration of the Liuxihe arch dam, and the flow-induced vibration of the Ertan hyperbolic arch dam are presented to explain the detailed …
Oblique Wave Scattering By A Submerged Porous Breakwater With A Partially Reflecting Sidewall, Yang Zhao, Hua-Jun Li, Yong Liu
Oblique Wave Scattering By A Submerged Porous Breakwater With A Partially Reflecting Sidewall, Yang Zhao, Hua-Jun Li, Yong Liu
Journal of Marine Science and Technology
This study develops an analytical solution for oblique wave scattering by a submerged porous breakwater with a leeside partially reflecting vertical wall. The matched eigenfunction expansion method is used to develop the analytical solution. The whole fluid domain is divided into three regions according to the geometries of the structures. The series solution of the velocity potential in each region is obtained by the separation of the variables, and the unknown expansion coefficients are determined using the pressure and velocity continuous conditions on interfaces of different regions. The newly developed analytical solution is confirmed by an independently developed multi-domain boundary …
Comparison Of Fatty Acid Compositions And Fuel Characteristics Of Biodiesels Made From Isochrysis Galbana Lipids And From Used Cooking Oil, Cherng-Yuan Lin, Bo-Yu Lin
Comparison Of Fatty Acid Compositions And Fuel Characteristics Of Biodiesels Made From Isochrysis Galbana Lipids And From Used Cooking Oil, Cherng-Yuan Lin, Bo-Yu Lin
Journal of Marine Science and Technology
The fatty acid compositions and typical fuel characteristics of the biodiesels produced from Isochrysis galbana lipids and used cooking oil were analyzed and compared in this study. The experimental results showed that the major fatty acid compositions of the biodiesel made from the extracted Isochrysis galbana lipids were significantly different from those of the biodiesel made from used cooking oil. The biodiesel made from the microalgae lipids primarily comprised 35.34 wt. % myristic acid (C14:0) whereas the major compound of the used cooking-oil biodiesel was 47.51 wt. % oleic acid (C18:1). Docosahexaenoic acid (DHA) at 4.67 wt. % was only …
Mixed H2/Passivity Performances Control Of Discrete-Time Linear Stochastic Systems, Cheung-Chieh Ku, Rui-Wen Chen
Mixed H2/Passivity Performances Control Of Discrete-Time Linear Stochastic Systems, Cheung-Chieh Ku, Rui-Wen Chen
Journal of Marine Science and Technology
A mixed performance control problem of discrete-time linear stochastic systems is discussed and investigated subject to H2 and passivity performances in this paper. Based on Itô modeling approach, stochastic systems can be represented as deterministic difference equation with multiplicative noise term. For the stochastic systems, H2 minimization problem and passivity constraint are simultaneously considered to achieve minimum output energy and attenuation performance. Applying Lyapunov theory, some sufficient conditions are derived into extended Linear Matrix Inequality (LMI) form to apply convex optimization algorithm. Moreover, a mixed H2/Passivity performance controller can be designed such that asymptotical stability and required performances of closed-loop …
An Improved Algorithm Of Trubulence Signal Denoising Based On Lms Adaptive Filtering, Xue Chen, Da-Lei Song, Xin Luan, Hua Yang, Xiu-Yan Liu
An Improved Algorithm Of Trubulence Signal Denoising Based On Lms Adaptive Filtering, Xue Chen, Da-Lei Song, Xin Luan, Hua Yang, Xiu-Yan Liu
Journal of Marine Science and Technology
Restricted by observation instruments and methods, the measured turbulence signals in the open ocean are inevitably affected by noise. To maximum eliminate the noise caused by the vibration of the instruments and improve the accuracy of the measured turbulence signals, an improved turbulence signal denoising algorithm based on least mean square (LMS) adaptive filter is proposed in this paper. The key point of the improved algorithm is to obtain the optimal weight value by the adaptive adjustment and remove the vibration noise from the measured shear signals in frequency domain. Through taking the Nasmyth theoretical spectrum as the desired signal …
Evaluation Of Different Trading Routes On Fatigue Damage For A 216k M3 Lng Carrier, Ozgur Ozguc
Evaluation Of Different Trading Routes On Fatigue Damage For A 216k M3 Lng Carrier, Ozgur Ozguc
Journal of Marine Science and Technology
This paper aims to address long term loads and fatigue damage accumulation for different trading routes relative to North Atlantic operations based on IACS scatter diagram for a 216,000 m3 LNG carrier. The evaluation is based on direct wave load analysis using WASIM and scatter diagrams created in accordance with DNV Code 30.5 for the following trades: 1. North Atlantic 2. World Wide 3. Qatar - Boston 4. Qatar - UK 5. Murmansk - Boston 6. Murmansk - Rotterdam 7. St. Petersburg - Canada 8. Sakhalin - Mexico port close to California USA 9. Sakhalin - Shanghai, China It is …
A Numerical Identification Of Excitation Force And Nonlinear Restoring Characteristics Of Ship Roll Motion, Jinsoo Park, Hong Gun Sung, Fayyaz Ahmad, Soo Hyun So, Stavros Syngellakis, Kwang Hyo Jung, Taek Soo Jang
A Numerical Identification Of Excitation Force And Nonlinear Restoring Characteristics Of Ship Roll Motion, Jinsoo Park, Hong Gun Sung, Fayyaz Ahmad, Soo Hyun So, Stavros Syngellakis, Kwang Hyo Jung, Taek Soo Jang
Journal of Marine Science and Technology
The present work identifies the nonlinear restoring characteristics and excitation force of ship roll motion in regular beam waves. The steady-state roll response data measured from a numerical simulation is utilized for the experiments of the applied method. Using the approach proposed by Jang (2014), the J-function and its one of zero-crossing times play a crucial role in the identification. The J-function is defined to be the sum of inertia force and nonlinear damping. For the zero-crossing time to be measured, system responses of angular displacement, velocity and acceleration need to be known and so does the numerical interpolation. Numerical …
Feasibility Assessment Of Substituting Stainless Steel With Aluminum Alloy For Hydraulic Gate, Kuo-Ho Chen, Tien-Kuen Huang
Feasibility Assessment Of Substituting Stainless Steel With Aluminum Alloy For Hydraulic Gate, Kuo-Ho Chen, Tien-Kuen Huang
Journal of Marine Science and Technology
In this paper, the feasibility of using aluminum alloy 5083 as a replacement for currently used stainless steel SUS 304L on hydraulic gate is evaluated. Relevant properties of these two materials are compared for use in hydraulic gates. Forty common types of hydraulic gates were analyzed through the finite element program PLAXIS 3D Foundation. It shows the weight for most types of hydraulic gates with aluminum alloy 5083 is in the range of 37.6-45.9% of that of stainless steel SUS 304L. At the same time, the cost of gate manufacturing is reduced 39.6-50.5% and cost of maintanence/operation can be reduced …
Improved Analysis Of Bolted Shear Connection Under Eccentric Loads, Dung-Myau Lue, Cheng-Yen Liao, Chien-Chien Chang, Wei-Ting Hsu
Improved Analysis Of Bolted Shear Connection Under Eccentric Loads, Dung-Myau Lue, Cheng-Yen Liao, Chien-Chien Chang, Wei-Ting Hsu
Journal of Marine Science and Technology
Almost all bolted connections are eccentrically loaded. The American Institute of Steel Construction (AISC) permits the use of elastic and instantaneous center of rotation (IC) methods to analyze eccentric bolted connections. The elastic method normally yields relatively conservative designs and the IC method, which provides more realistic analyses, is rather complex and tedious. The current AISC manual provides tables for determining coefficient C, which is used to obtain the design strength of bolt group patterns. However, the tables provide values for only six angles of inclination (θ = 0°, 15°, 30°, 45°, 60°, and 75°). For other angles, a direct …
Non-Parametric Identification Of Nonlinear Damping And Restoring Forces For Ship Free Roll Decay In Numerical Tank, Yin Jiang, Ren-Chuan Zhu, Guo-Ping Miao, Ju Fan, Chao Ma
Non-Parametric Identification Of Nonlinear Damping And Restoring Forces For Ship Free Roll Decay In Numerical Tank, Yin Jiang, Ren-Chuan Zhu, Guo-Ping Miao, Ju Fan, Chao Ma
Journal of Marine Science and Technology
Numerical simulations of free roll decay are carried out for the DTMB 5512 based on computational fluid dynamics (CFD) theory and adoption of overset mesh technology. The numerical time history of the ship roll shows good quantitative agreement with the experimental time history in the case of Fr = 0.138 with an angle of list of θa0 = 10°. The natural period is well estimated, there is less than 2% error. According to the time history of the roll angle and the corresponding angular velocity, the nonlinear ship roll damping and restoring force of the hull are identified by solving …