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Articles 1 - 30 of 81
Full-Text Articles in Engineering
A New Calibration Method For Low Cost Mems Inertial Sensor Module, Sheng-Chih Shen, Chia-Jung Chen, Hsin-Jung Huang
A New Calibration Method For Low Cost Mems Inertial Sensor Module, Sheng-Chih Shen, Chia-Jung Chen, Hsin-Jung Huang
Journal of Marine Science and Technology
This paper presents a new calibration method to overcome the challenges of MEMS inertial sensors for underwater navigation. The MEMS inertial sensor module is composed of an accelerometer, a gyroscope and a circuit of signal process. For navigation estimation, it is easy to be influenced by errors which come from MEMS inertial sensors. In general, the sources of error can be categorized into two groups, deterministic type and stochastic type. The former primarily includes bias errors, misalignment and nonlinearity; the latter contains temperature effect and signal drifting. Subsequently, the linearity calibration is used to modify the deterministic error and the …
Determining The Cyclic Strength Of Geomaterials Under Low Frequency Cyclic Loading With Acoustic Emission, Helsin Wang, Ta-Peng Chang, Ju-Jiang Hung
Determining The Cyclic Strength Of Geomaterials Under Low Frequency Cyclic Loading With Acoustic Emission, Helsin Wang, Ta-Peng Chang, Ju-Jiang Hung
Journal of Marine Science and Technology
Acoustic emission is traditionally regarded as an explicit measurable index for microcracking in geomaterials. An accelerative cracking point is first introduced based on the different characteristics of acoustic emission at stable fracture propagation stage. Accelerative cracking point is located between the fracture initiation strength and critical energy release point, a point causing a fatal uncontrolled fracture in materials. Microcracking dominates the real mechanical characteristics in the materials, not reflected on the conventional mechanical experimental results as the stress level beyond the accelerative cracking point at the stable fracture propagation stage. At this stage, non-stress-controlled fracture in materials could arise as …
Fast Block Motion Estimation With Edge Alignment On H.264 Video Coding, Chi-Han Chuang, Chien-Hua Su, Shyi-Chyi Cheng
Fast Block Motion Estimation With Edge Alignment On H.264 Video Coding, Chi-Han Chuang, Chien-Hua Su, Shyi-Chyi Cheng
Journal of Marine Science and Technology
This paper presents a novel block matching scheme with edge alignment strategy on H.264 video coding, which uses multiple references and multiple block sizes for motion estimation in order to improve the rate-distortion performance. In H.264, the computational complexity is linearly dependent on the number of allowed reference frames and block sizes using the full exhaustive search. Many fast block-matching algorithms reduce the computational complexity of motion estimation by carefully designing the search patterns with different shapes or sizes which have significant impact on the search speed and distortion performance. However, the search speed and the distortion performance conflict often …
The Application Of E-Technology For Marine Information Service, Lien-Kwei Chien, Tsung-Shen Feng, Chieh-Cheng Yen, Beng-Chun Lee, Heng-Wen Chang
The Application Of E-Technology For Marine Information Service, Lien-Kwei Chien, Tsung-Shen Feng, Chieh-Cheng Yen, Beng-Chun Lee, Heng-Wen Chang
Journal of Marine Science and Technology
The purpose of this study is to establish the multi-function querying system by applying e-technology in marine data. Subjects tendency technology is new concept in system designing process of this study which originate from simulation language that was replace the structural technology. We also investigate the statistical characteristics of ocean waves and surges over Taiwan waters by cluster and return period analysis. Marine drifter track analysis and search area determination system were also analysis and import to GIS querying system. In order to make the locations of the near shore ships and sailing data could be easily convey through wireless …
The Performance Of Indium Tin Oxide Films Deposited On Plastic Substrate Applied For Solar-Cell Buoy, Chien-Kun Wang, Jyh-Jier Ho, Sung-Jen Nien, Yuang-Tung Cheng, William Lee, Chih-Chiang Lu, Bao-Shun Yau, Hsing-Wang Tsai, Chung-Cheng Chang
The Performance Of Indium Tin Oxide Films Deposited On Plastic Substrate Applied For Solar-Cell Buoy, Chien-Kun Wang, Jyh-Jier Ho, Sung-Jen Nien, Yuang-Tung Cheng, William Lee, Chih-Chiang Lu, Bao-Shun Yau, Hsing-Wang Tsai, Chung-Cheng Chang
Journal of Marine Science and Technology
In this paper, we report the indium tin oxide (ITO) films deposited on the polyethyene terephthalate (PET) substrate, which surface is treated with detergent solution. The ITO films are deposited on room temperature by direct current (DC) magnetron sputtering from a ceramic target of a 90% In-10% Sn alloy. The deposited opto-electric ITO films on PET with detergent treatment are 83.4% average visible transparency, and 5.8 × 10-4 Ω-cm resistivity, respectively. And then, we use the spin coating to form the polymer solar cell. Under optimal conditions of surface treatment and film deposition, the experimental result shows 2.12% of the …
Signal Subspace Transformation For Direction-Of-Arrival Estimation Of Wideband Sources In Near Field, Lena Chang
Signal Subspace Transformation For Direction-Of-Arrival Estimation Of Wideband Sources In Near Field, Lena Chang
Journal of Marine Science and Technology
A novel adaptive signal subspace transformation for direction-of-arrival (DOA) estimation of wideband sources in the near-field is proposed in this paper. The method is composed of two transformations: signal subspace focusing (SSF) and far-field transformation (FFT). SSF aligns the signal subspaces for different frequencies in the bandwidth of the sources based on focusing matrices. FFT transforms the near-field steering vector to be the far-field steering vector with same direction-of-arrival (DOA) allocation. By the way, we simplify the location estimation of wideband sources in the near-field to be narrowband sources in the far field. The proposed method can track the DOAs …
Response Analysis Of Concrete Piles Subjected To Lateral Impact, Helsin Wang, Ta-Peng Chang, Jin-Jun Wang
Response Analysis Of Concrete Piles Subjected To Lateral Impact, Helsin Wang, Ta-Peng Chang, Jin-Jun Wang
Journal of Marine Science and Technology
One-dimensional wave theory is assumed to interpret longitudinal waves impulse response or impact echo testing results in concrete piles. Transient flexural waves tests are alternatively introduced to evaluate piles where the tops are inaccessible for conventional longitudinal wave testing. The resulting interpretation for flexural waves based on one-dimensional wave theory is improper due to various velocities at low frequencies. In this research, treating a pile as a waveguide, three-dimensional wave theory provides the dispersion relation between phase flexural velocity and frequency. Using the resonance solutions and first-mode flexural wave curve is a simple and efficient method to find the resonant …
The Study On The Asymptotic Profile And The Flow Patterns In Front Of A Long Bubble Through A Circular Tube, Cheng-Hsing Hsu, Chia-Chuan Kuo, Ching-Chuan Chang, Kuang-Yuan Kung
The Study On The Asymptotic Profile And The Flow Patterns In Front Of A Long Bubble Through A Circular Tube, Cheng-Hsing Hsu, Chia-Chuan Kuo, Ching-Chuan Chang, Kuang-Yuan Kung
Journal of Marine Science and Technology
Department of Civil Engineering, Army Academy, Chung-Li, Taoyuang, Taiwan, R.O.C
Investigation On Vibration Energy Flow Characteristics In Coupled Plates By Visualizaiton Techniques, Kai Li, Sheng Li, De-You Zhao
Investigation On Vibration Energy Flow Characteristics In Coupled Plates By Visualizaiton Techniques, Kai Li, Sheng Li, De-You Zhao
Journal of Marine Science and Technology
The transmission and distribution of vibration energy flow in coupled plates are studied by the vibration intensity method together with visualization technique. Formulations for vibration intensity calculations and streamline representation, and the equations for energy flow are presented. The intensity vector, streamline map and energy distribution of coupled plates subject to a point force excitation are calculated and visualized to predict vibration energy transmission. The vibrational energy flows are very complex and dependent on the excitation frequencies, junction forms and boundaries. The energy sources, sinks, transmission paths and vortex fields are clearly shown with visualization technique. It is shown that …
Sidescan Sonar Image Processing:Correcting Brightness Variation And Patching Gaps, Yet-Chung Chang, Shu-Kun Hsu, Ching-Hui Tsai
Sidescan Sonar Image Processing:Correcting Brightness Variation And Patching Gaps, Yet-Chung Chang, Shu-Kun Hsu, Ching-Hui Tsai
Journal of Marine Science and Technology
Sidescan sonar data are typically presented as gray level images. However, sidescan images often show striking variations in brightness. These variations, caused by the sonar beam pattern and the constantly changing attitude of the towfish, make the images difficult to read as pictures of the seabed. This reduces the utility of the images for marine geologists. In this paper, the effects of the sonar beam pattern across the swath are corrected using a normalization process based on the average signal intensity for each grazing angle. Noise along the track, which is generally caused by changes in the attitude of the …
The Sensitivity Analysis Of A Mems Microphone With Different Membrane Diameters, Cheng-Ta Yang
The Sensitivity Analysis Of A Mems Microphone With Different Membrane Diameters, Cheng-Ta Yang
Journal of Marine Science and Technology
In MEMS capacitive microphone design, it is very critical to get highest yielding rate and sensitivity as the two major factors dominate structure design of microphone. The centralpost MEMS microphone is introduced in this paper to differentiate from traditional fixed membrane boundary microphone since the construction is simple and only few masks are required in the process so that the yielding can be greatly enhanced. Thus, it is necessary to find the relationship between the sensitivity and dimension of the diameter of the membrane. The main research steps described in this paper include using CoventorWarer to develop one analysis model …
Stability Assessment For The Undersea Gas Pipeline, Wen-Chien Tseng, Lien-Kwei Chien, Sheng-Tse Chuang, Pei-Chi Tsai, Ya-Ting Hsu, Ting-Ting Lu, Chu-Kuan Lin
Stability Assessment For The Undersea Gas Pipeline, Wen-Chien Tseng, Lien-Kwei Chien, Sheng-Tse Chuang, Pei-Chi Tsai, Ya-Ting Hsu, Ting-Ting Lu, Chu-Kuan Lin
Journal of Marine Science and Technology
In general, the activities of harbour district, coastal construction and re-transportation of tide and current are all possible to influence the stability of research area and sediment environment in nearshore area. It indicates that status of deposit property of seabed and variability of sediment environment are important factors to stability and safety for the path of undersea gas pipeline. An assessment procedure and approach for the prediction of the wave-induced and earthquake-induced liquefaction potential and erosion potential are proposed for marine engineering practice. The soil sample of this study is obtained from deposit zone of gas pipeline of seabed in …
An Algorithm For Predicting Attitudes Of Floating Bodies With Arbitrary Configurations In Liquids, Jiann-Lin Chen, Chun-I Chen, Li-Ming Chu
An Algorithm For Predicting Attitudes Of Floating Bodies With Arbitrary Configurations In Liquids, Jiann-Lin Chen, Chun-I Chen, Li-Ming Chu
Journal of Marine Science and Technology
A robust and efficient algorithm is proposed to quasiunsteadily predict attitudes of floating bodies with arbitrary configurations. Numerical techniques for accuracy and computing time saving are addressed. A floating cylinder was modeled as a benchmark, by theoretical and experimental approaches, to validate the developed program. Attitudes of two kinds of floating bodies, which are a body composed of multiple objects and a submarine-like submersible, were simulated to show the feasibility of the present algorithm. Interestingly, the simulated results of a slender body, such as a cylinder or a submersible, show that the attitude variation is very sensitive to the longitudinal …
A Time-Domain Analysis Of Wave Force On Small-Scale Cylinders Of Offshore Structures, Bao-Lei Geng, Bin Teng, De-Zhi Ning
A Time-Domain Analysis Of Wave Force On Small-Scale Cylinders Of Offshore Structures, Bao-Lei Geng, Bin Teng, De-Zhi Ning
Journal of Marine Science and Technology
To get the accurate wave loads on the small-scale cylinders on the platforms, not only the incident wave but also the diffraction and radiation wave should be considered. By taking the wave diffraction from a fixed large-scale cylinder as an example, wave loads on small-diameter cylinders in the diffraction wave field are calculated by Morison formula in this paper. A time-domain numerical model on wave diffraction from large-scale structures is developed with a higher-order boundary element method (HOBEM). Then the velocity and acceleration of any water particle in the fluid domain can be produced from the solved diffraction potential. Results …
Improving The Emulsion Stability Of Sponge Cake By The Addition Of ?-Polyglutamic Acid, Yung-Shin Shyu, Wen-Chieh Sung
Improving The Emulsion Stability Of Sponge Cake By The Addition Of ?-Polyglutamic Acid, Yung-Shin Shyu, Wen-Chieh Sung
Journal of Marine Science and Technology
The batter properties of sponge cake with the addition of γ-polyglutamic acid (PGA) at different levels (0.05, 0.1, 0.5 gkg-1, w/w) was evaluated. The viscosity, emulsion stability and foam stability increased at the addition of 0.5 gkg-1 PGA level. PGA caused significant declines in the differential scanning calorimetry (DSC) enthalpy, onset and peak temperatures of ice-melting transition of sponge cake. Sponge cakes manufactured with 0.5 gkg-1 PGA addition were in general lighter on crumb color and white index than the control. Scanning electron microscopy showed that sponge cake with the addition of 0.1 and 0.5 gkg-1 PGA exhibited microstructures having …
Cooperation-Competition Model Of Transportation Construction Project From The Viewpoint Of Budget Allocation, Maw-Cherng Lin, Edward Ming-Yang Wu, Junn-Yuan Teng, Wen-Chih Huang
Cooperation-Competition Model Of Transportation Construction Project From The Viewpoint Of Budget Allocation, Maw-Cherng Lin, Edward Ming-Yang Wu, Junn-Yuan Teng, Wen-Chih Huang
Journal of Marine Science and Technology
Department of Marine Engineering, National Taiwan Ocean University, Keelung 202, Taiwan.
A Study Of Identifying Success Variables For Construction Partnering Via Sem Framework, Tung-Tsan Chen, Chih-Han Kao
A Study Of Identifying Success Variables For Construction Partnering Via Sem Framework, Tung-Tsan Chen, Chih-Han Kao
Journal of Marine Science and Technology
Owners and contractors in construction partnerships cooperate to quickly achieve results with reduced start-up costs, achieve a win-win result for both parties, increase efficiency, and reduce the possibility of conflict in construction projects. This study explored success variables (SVs) in construction partnerships via a novel framework. A questionnaire survey was distributed to experienced practitioners in the Taiwan construction industry. Factor analysis was applied to extract SVs based on the questionnaire results. Structural equation modeling (SEM) was then used to verify the relationships between the SVs identified in construction partnership. The analytical results showed that four success factors (SFs) in construction …
Design Of A Novel Hand-Held Pneumatic Vacuum Pad Using Cfd, Jyh-Chyang Renn, Chin-Yi Cheng, Yong-Chao Yang
Design Of A Novel Hand-Held Pneumatic Vacuum Pad Using Cfd, Jyh-Chyang Renn, Chin-Yi Cheng, Yong-Chao Yang
Journal of Marine Science and Technology
In this paper, a novel hand-held pneumatic vacuum pad is developed using CFD-simulation. CFD is the abbreviation of Computational Fluid Dynamics, which is a powerful and reliable tool to provide an effective insight into the flow field numerically. Nowadays, application of pneumatic vacuum pads may be found in many different real industries, especially in the field of automatic conveyer system, automatic or manual assembly line, semiconductor industry as well as wafer factory, etc. Traditional vacuum pads are generally mounted on robots or other machines to form automated manufacturing systems. In this paper, however, a novel cylindrical vacuum pad specially designed …
On State-Feedback Controller Synthesis For A Class Of Second-Order Nonlinear Systems With Uncertainties, Jenq-Lang Wu, Chee-Fei Yung
On State-Feedback Controller Synthesis For A Class Of Second-Order Nonlinear Systems With Uncertainties, Jenq-Lang Wu, Chee-Fei Yung
Journal of Marine Science and Technology
This paper presents a constructive method to design stabilizing controllers for a class of second-order uncertain nonlinear systems whose input parts may vanish at the origin. A sufficient condition for the existence of stabilizing state feedback controllers is provided. Under the small control property, a formula is proposed for constructing continuous stabilizing feedback laws. In the case that the small control property does not hold, another formula for constructing continuous state feedback controllers, with small control magnitude near the origin, to achieve robust practical stability is presented.
Optimal Estimation For Key Parameters Of The Marine Quality Model Using Data-Driven Neural Network, Ming-Chang Li, Shu-Xiu Liang, Zhao-Chen Sun, Guang-Yu Zhang
Optimal Estimation For Key Parameters Of The Marine Quality Model Using Data-Driven Neural Network, Ming-Chang Li, Shu-Xiu Liang, Zhao-Chen Sun, Guang-Yu Zhang
Journal of Marine Science and Technology
Marine water quality models are complicated because of their multi-parameter and multi-response characteristics. One major difficulty with water quality models is the accurate estimation of model parameters. In this paper, a new method based on a data-driven model (DDM) is developed to retrieve the value of model parameters. All training data are calculated by numerical water quality models from results of multiparameter matching design cases so the physical properties are not disturbed. The concept is to find the relationship between model parameters and the pollution concentration values of interior stations. Field data are imported into the relationship for inversing optimal …
Determination Of Interfaces In Soil Layers By Sound Wave Analysis With Cone Penetration Tests, Huei-Wen Chang, Tseng-Hung Chang, Viet-Tuong Nguyen, Chih-Wei Wang
Determination Of Interfaces In Soil Layers By Sound Wave Analysis With Cone Penetration Tests, Huei-Wen Chang, Tseng-Hung Chang, Viet-Tuong Nguyen, Chih-Wei Wang
Journal of Marine Science and Technology
This experimental study precisely identifies the soil layer interface using sound signals collected during cone penetration tests (CPTs). Using the high sensitivity of the sound sensor at the cone tip, this study effectively increases the accuracy in identifying the soil interface location. Shiluo sand and Jhongda Lateritic soil were used to construct large-scale soil layers. An acoustic CPT was applied to determine sound pressure and its root mean square (RMS). The Fourier spectrum and Hilbert-Huang transform (HHT) method were utilized and compared in their ability to analyze sound signals. The HHT method with a local energy-instantaneous frequencytime distribution performed well. …
Unsteady Multiphase Modeling Of Cavitation Around Naca 0015, Abolfazl Asnaghi, Ebrahim Jahanbakhsh, Mohammad Saeed Seif
Unsteady Multiphase Modeling Of Cavitation Around Naca 0015, Abolfazl Asnaghi, Ebrahim Jahanbakhsh, Mohammad Saeed Seif
Journal of Marine Science and Technology
The present study focuses on the numerical simulation of cavitation around the NACA 0015. The unsteady behaviors of cavitation which have worthwhile applications are investigated. The cavitation patterns, velocity fields and frequency of the cavitating flow around hydrofoil is obtained. For multi phase simulation, single-fluid Navier–Stokes equations, along with a volume fraction transport equation, are employed. The bubble dynamics model is utilized to simulate phase change. SIMPLE algorithm is used for velocity and pressure computations. For discretization of equations the finite-volume approach written in body fitted curvilinear coordinates, on collocated grid, is used. In this study, unsteady simulation of cavitation …
Corrosion Behaviour Of Brass In The Vembanad Estuary, India, Andy Mathiazhagan, Rani Joseph, Kanjiramparayil Puthilon Narayanan, Palaniandy Seralathan
Corrosion Behaviour Of Brass In The Vembanad Estuary, India, Andy Mathiazhagan, Rani Joseph, Kanjiramparayil Puthilon Narayanan, Palaniandy Seralathan
Journal of Marine Science and Technology
Corrosion characteristics of brass panels were investigated in the Vembanad estuarine water (Cochin Harbor), India over a period of one year. The corrosion rate of brass samples during exposure was determined by gravimetric method and fouling on panels was assessed, exposure-wise, in terms of biomass. Corrosion products were identified by X-Ray diffraction. The results of the study were discussed in the light of the seawater characteristics.
A Wide Speed Range Sensorless Control Technique Of Brushless Dc Motors For Electric Propulsors, Min-Fu Hsieh, Hung-Ju Liao
A Wide Speed Range Sensorless Control Technique Of Brushless Dc Motors For Electric Propulsors, Min-Fu Hsieh, Hung-Ju Liao
Journal of Marine Science and Technology
This paper presents a sensorless drive technique for permanent-magnet brushless DC motors applied to electric propulsors of small ships or underwater vehicles. Propulsors enveloping electric motors (e.g., POD or subsea thrusters) have been increasingly applied due to their advantages of excellent maneuverability, high efficiency and low maintenance costs. To secure reliable operation under water, sensorless control is considered as an appropriate technique. However, conventional sensorless techniques often suffer problems of narrow speed range and low efficiency, particularly when the propulsors sustain heavy load at high speed operation. Hence, a sensorless technique with a wide speed range is developed in this …
The Study Of Ship Collision Avoidance Route Planning By Ant Colony Algorithm, Ming-Cheng Tsou, Chao-Kuang Hsueh
The Study Of Ship Collision Avoidance Route Planning By Ant Colony Algorithm, Ming-Cheng Tsou, Chao-Kuang Hsueh
Journal of Marine Science and Technology
Maritime traffic is becoming more complex every day. At present, due to technological advances and to new maritime regulations, there is increasing demand for new nautical marine instruments to be installed into the bridge, and the breadth of navigational information complicates on-duty officers’ decisions. Therefore, if decision support tools can be used to help deal with navigational decision-making, human errors arising from subjective judgments can be reduced, and sea transport safety improved. This research uses the concept of e-navigation as a framework, positioning collision avoidance path planning as the main theme, and applies an Ant Colony Algorithm (ACA) in the …
Maintenance Algorithm And Management System Of Sidewalk Facility, Lee-Kuo Lin, Chen-You Jian
Maintenance Algorithm And Management System Of Sidewalk Facility, Lee-Kuo Lin, Chen-You Jian
Journal of Marine Science and Technology
Sidewalk is one kind of infrastructure systems in each city, because every sidewalk facility is used by pedestrians, so the maintenance algorithm should be evaluated and worked with users’ role. To echo this reasonable concept, this research investigates several using influence factors, which were collected and evaluated from pedestrians. For statistical analysis, scientific tools including Delphi method, analytic hierarchy process (AHP), and fuzzy theory were used to analyze and establish a preliminary evaluation model of sidewalk maintenance system. In order to use this model pragmatically, this research also establishes a portable prototype system at PDA hardware. With this portable system, …
Experimental Study Of Silver Nanofluid On Flat Heat Pipe Thermal Performance, Yu-Tang Chen
Experimental Study Of Silver Nanofluid On Flat Heat Pipe Thermal Performance, Yu-Tang Chen
Journal of Marine Science and Technology
This study utilizes silver nano-fluid filled flat heat pipe. It is aimed at effect of various concentrations on flat heat pipe thermal performance by air-cooling testing equipment. The particles used in these experiments were silver particles 35 nm in size. The base working fluid was pure-water. Nano-fluids were prepared using a two-step method. In the experiment, the thickness and length of the heat pipe are 3 mm and 200 cm, respectively. An experimental system was set up to measure the temperature distribution of heat pipes and calculate the thermal resistance by equation R = ∆T/Q. At a same charge volume, …
Hamilton Decomposition Of Complete Bipartite 3-Uniform Hypergraphs, Jirimutu Jirimutu, Jul Wang
Hamilton Decomposition Of Complete Bipartite 3-Uniform Hypergraphs, Jirimutu Jirimutu, Jul Wang
Journal of Marine Science and Technology
The problem of finding a Hamilton decomposition of the complete 3-uniform hypergraph 3 Kn has been solved for n ≡ 2(mod 3), n ≡ 4(mod 6) [2], n ≡ 1(mod 6), n ≡ 0(mod 3) (for 3 , K I n − the complete 3-uniform hypergraph minus a 1- factor) [5]. In this paper, we give the concept of the bipartite hypergraphs and find a Hamilton decomposition of the complete bipartite hypergraph 3 Km,m for m be prime.
Steady-State Characteristics Analysis Of Deep-Sea Running Mechanism With Planetary Gear Wheel Based On Articulated Steering Radius, Ya-Li Feng, Yi-Ting Kang, Wen-Ming Zhang, Jie Zhang
Steady-State Characteristics Analysis Of Deep-Sea Running Mechanism With Planetary Gear Wheel Based On Articulated Steering Radius, Ya-Li Feng, Yi-Ting Kang, Wen-Ming Zhang, Jie Zhang
Journal of Marine Science and Technology
Steady-state characteristics analysis for the deep-sea running mechanism with planetary gear train which is designed to adapt to complex terrain in the deep-sea hydrothermal sulfide and rich-cobalt incrustation survey area is based on articulated steering radius. The articulated steering radius formula of the deep-sea running mechanism is derived from the geometric relationship, considering the wheel side slip angle. Based on the formula, three types of steering steady-state characteristic analysis, understeer, neutral steer and oversteer, are made for the mechanism. Steering simulation analysis of the running mechanism with planetary gear is conducted in ADAMS software with different speed. In the process …
Risk Evaluation Of Ship Dynamic Stability In Regular Waves, Zhan-Jun Long, Seung-Keon Lee, Han-Suk Choi
Risk Evaluation Of Ship Dynamic Stability In Regular Waves, Zhan-Jun Long, Seung-Keon Lee, Han-Suk Choi
Journal of Marine Science and Technology
In this paper, a method combined with the existing approaches is proposed for evaluating and predicting the safety of ship rolling in regular waves. Based on the uncoupled equation of a single degree of freedom, the nonlinear ship rolling in waves is presented and the differential equation is integrated in the time domain by the fourth order Runge-Kutta algorithm. The erosion of the safe basins of a ship roll equation is simulated and the survival probability of a typical ship is studied according to the statistical and simulation results. The numerical results show that the survival probabilities of ship excited …