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Tri Dung Dang,Cong Binh Phan,Kyoung Kwan AHN 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
Nowadays, wave energy plays an important role in renewable energy resource. In over 30 years, several researches in wave energy converter system (WEC) have been deployed and carried out. This paper proposes a new mechanism to achieve the resonant behavior of a point absorber floating buoy type of WEC system with mechanical power take-off. The original WEC system uses the bidirectional gearbox to convert up and down motion of the wave in heave mode to one-way rotation. By designing the array of hydraulic springs, the equivalent stiffness of the float can be reduced to close to the relatively low frequency of the wave. Then the buoy is at near resonance with the wave, also increase the power capture bandwidth and the performance of the operating system. In this paper, the specification of the system is proposed and studied. The working principle is analyzed. The mathematical model is then derived to investigate the operation. Experiments are performed to validate the simulation results based on mathematical model. Numerical simulation using Matlab/Simulink has been done to evaluate the effectiveness of the new control stiffness mechanism.
A study on wave energy converter using 5 cylinders system
Dang Tri Dung,Phan Cong Binh,Do Hoang Thinh,Kyoung Kwan Ahn 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Nowadays, wave energy plays an important role in renewable energy resource. In over thirty years, researches in wave energy converter system (WEC) have been deployed and carried out. This paper presents a design of wave energy converter using 5 cylinders combining with hydraulic power take-off system in order to convert the mechanical energy from ocean wave to electricity, or another useful and usable source. The WEC uses ordered 5 cylinders to represent the motion of the floating buoy under the wave elevation. The design and specification of the WEC system are presented. Buoy and wave interaction mathematical model is built and the hydraulic mathematical model is also presented. The system performance test is implemented and the result is shown.
Tri Dung Dang,Cong Binh Phan,Kyoung Kwan AHN 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.4
This paper presents an experimental investigation on the hydrodynamic performance and energy conversion efficiency of an efficient wave energy converter using a simple conceptual design. The system is based on a mechanical device power take-off (PTO) so-called a bidirectional rotary motion converter (BRMC), which can absorb wave energy by converting bidirectional motion of ocean waves into one-way rotation of an electric generator. First, a prototype system is designed, fabricated and assembled in the Research Institute of Small & Medium Shipbuilding (RIMS). The tests are carried out under different conditions, such as wave profiles, the resistive load coefficients and supplementary masses. A wave simulator is controlled to make harmonic waves with different amplitudes and frequencies. Metal plates are added and fixed on the buoy as supplementary masses. Closed-loop torque control has been applied on the Magneto-Rheological (MR) brake to simulate the induced torque of an electric generator. Moreover, the rotary angle compared to vertical direction, is adjusted to investigate the influence of surge mode and heave mode combination on the absorption energy. The output power is calculated and compared with maximum theoretical absorbed power in heave mode to evaluate the efficiency of the prototype under different conditions. Finally, at optimum condition, the efficiency of the PTO system can reach 80.4% including frictional loss, and the capture width ratio is up to 41.6%.
A study on modeling of a hybrid wind wave energy converter system
Tri Dung Dang,Cong Binh Phan,Hoai Vu Anh Truong,Chau Duy Le,Minh Tri Nguyen,Kyoung-Kwan Ahn 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
A model of a hybrid wind wave energy converter (HWWEC) system is proposed in this paper. The HWWEC includes two wave buoys and a vertical axis wind turbine (VAWT) system, which co-works to drive a generator. Wave buoys are arranged in an arc pattern to capture efficiently wave energy from many directions. The hydrodynamic forces are calculated by the Wave Analysis at Massachusetts Institute of Technology WAMIT software. In order to bring the system into resonance with the incident wave frequencies, a variable inertia hydraulic flywheel is employed so that the power output is maximized. Specifications and working principle of the whole system are presented and described. WEC unit model and hybrid mechanism are also presented. Simulations are carried out to evaluate the performance the HWWEC with the given specifications. Then, simulation results under some phase differences are taken to investigate the influence on the overall efficiency.
Dang, Tri Dung,Do, Tri Cuong,Truong, Hoai Vu Anh,Ho, Cong Minh,Dao, Hoang Vu,Xiao, Yu Ying,Jeong, EunJin,Ahn, Kyoung Kwan The Korean Society for Fluid Power and Constructio 2019 드라이브·컨트롤 Vol.16 No.1
The objective of this study was to design and model the PEM fuel cell excavator with supercapacitor/battery hybrid power source to increase efficiency as well as eliminate greenhouse gas emission. With this configuration, the system can get rid of the internal combustion engine, which has a low efficiency and high emission. For the analysis and simulation, the governing equations of the PEM system, the supercapacitor and battery were derived. These simulations were performed in MATLAB/Simulink environment. The hydraulic modeling of the excavator was also presented, and its model implemented in AMESim and studied. The whole system model was built in a co-simulation environment, which is a combination of MATLAB/Simulink and AMESim software. The simulation results were presented to show the performance of the system.
Tri Dung Dang,Minh Tri Nguyen,Cong Binh Phan,Kyoung Kwan AHN 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
To reduce environmental pollution, alternative renewable energy resources have been explored for decades. Wave energy has a high energy density, high utilization time and no fuel costs, so it is considered as the most promising alternative to the fossil fuel resources. The number of studies of wave energy converters (WECs) has rapidly increased. This paper proposes a new method to achieve the resonant behavior of a point absorber floating buoy type of WEC using a mechanical power take-off system. By using the inertia characteristics of a hydraulic flywheel accumulator-based electro-hydraulic actuator to change the corresponding supplementary mass of the floating buoy, the total mass of the buoy was close to a match with the relatively low frequency of the wave, so that the buoy was in resonance with the wave. The specifications of the hydraulic flywheel accumulator system were proposed and studied. The working principle was analyzed, and a mathematical model was then derived to investigate the system operation. An experimental set-up was implemented to validate the mathematical model. Numerical simulation using MATLAB/Simulink was done to evaluate the operation of the system.
Using Machine Learning to Predict Heat Affected Zone in Steel Induction Heating
Dang Tri Dung,Nguyen Truong Thinh 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
The uncertain relationship between the size of a steel plates heat-affected zone and the heating parameters related during the heating process in induction heating means that this causes a different deformation of the steel plate. The electromagnetic induction approach has been used to control plate deformation in the steel manufacturing ship hull process instead of torch heating. This research investigates the heat flux distribution over a steel plate during the induction process numerically first, with the assumption that the process is quasi-stationary around the inductor and that the heat flux is significantly dependent on the temperature of the workpiece. Following the analysis of the heat flux, a commercial FEM program with heating settings is used to perform thermo-mechanical and heat flow studies on the plate. The heataffected zones size and after that, the supplied heating parameters are synthesized using machine learning to develop simplified regression that can quickly reveal the relationship between the heating parameters and the heat-affected zones size. The formula findings are quite similar to the simulation results.
Tri Dung Dang,Tri-Cuong Do,안경관 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.5
The hydraulic power take-off (HPTO) is considered as the most promising method to convert wave power to electrical power. This paper presents an experimental assessment of the power conversion of a wave energy converter using HPTO. Based on the experimental results, a modification of accumulator pre-charged pressure and a control strategy were proposed to improve the system performance. System design, the working principle and mathematical model of all components were described. The proposed method was verified based on both simulation and experimental tests. The results showed that the system always works at an optimal condition under different input wave conditions.