|
Influence of Control Parameters on Overall Performance of Geared Open Rotor Engine |
|
Ziyu Zhang, Xiabo Zhang, Zhanxue Wang(Northwestern Polytechnical University, China) |
| The open rotor engine combines the high propulsion efficiency of the turboprop engine and the high flight speed of the turbofan engine, and is one of the ideal power devices for civil aviation in the future. In order to maintain the pitch angle and efficiency of the propfan at a reasonable level throughout the flight envelope, a pitch control mechanism must be used to control the pitch angle of the blades. The research shows that the sudden large-scale change of the control parameters will have an important impact on the performance of the open-rotor engine. |
|
|
Empirical Modeling of Variance in Medium Frequency R-Mode Time-of-Arrival Measurements |
|
Jaewon Yu(Yonsei University, Korea), Pyo-Woong Son(KRISO, Korea) |
| The R-Mode system is designed to address the vulnerabilities
of global navigation satellite systems and explore the potential of a complementary navigation system.
This study aims to enhance the accuracy of performance simulation for the medium frequency R-Mode system by
modeling the variance of time-of-arrival measurements based on actual data. Drawing inspiration from the method
used to calculate the standard deviation of time-of-reception measurements in Loran, we adapted and applied this
approach to the MF R-Mode system. Data were collected from transmitters in Palmi and Chungju, South Korea, and the
parameters for modeling the variance of TOA were estimated. |
|
|
Robust Attitude Stabilization of Quadrotor via Adaptive Control based on Quaternion |
|
Dohyun Eom, Jeonghyun Byun, H. Jin Kim(Seoul National University, Korea) |
| This paper presents an attitude control law for quadrotors, addressing challenges in maintaining stable attitude against unknown external disturbances. The control law compensates for Coriolis torque, ensuring stability via a Lyapunov function. An adaptation law estimates disturbance values, enabling the quadrotor to counter unpredictable forces, thus maintaining desired attitude. Numerical simulations evaluate the proposed controller, considering scenarios with and without disturbances. Compared to an alternative controller, the proposed one, even with unknown disturbances, excels in stability and robustness. It achieves asymptotically stability. |
|
|
Analysis of Power Network Stabilities Considering the Uncertainty of Large Renewable Power Generations |
|
Haesong Cho, Sung-Wook Yi(Seoul National University of Science & Technology, Korea), Dohoon Kwon(SeoulTech, Korea) |
| This paper presents a one of the methods for power network stability analyses considering the uncertainty of large renewable power generations in the Korea Electrotechnology Research Institute (KERI). The proposed method forecasts the renewable power generations with probabilistic ranges instead of a point prediction for next time step. A power network modelling is then conducted automatically several times using forecasted loads and the renewable power generations having probabilistic ranges. Finally, the power network stability analyses are conducted automatically for every forecasted power network models. |
|
|
Development of an Automated Program for the Radioisotope Separation and Purification System |
|
Jinsik Ju(KAERI, Korea), Junyoung Lee, Jeonghoon Park(Korea Atomic Energy Research Institute, Korea), Pilwon Hur(Gwangju Institute of Science and Technology, Korea), MinGoo Hur(Korea Atomic Energy Research Institute, Korea) |
| In this study, a software was developed to remotely control the syringe pump and solenoid valve, aiming to minimize radiation exposure for the worker. Additionally, a feature was added to automatically control the process based on sequences written by the worker. This feature can process sequence data recorded in an Excel file, allowing the worker to modify the sequences by editing the Excel file without the need to modify the program code.The developed program not only minimizes radiation exposure and human errors for the worker but also ensures the production of radioactive isotopes with consistent quality. |
|
|
The Road Estimation of The Vehicle Motion |
|
Jeongku Kim(Hyundai Mobis, Korea), Seul Jung(Chungnam National University, Korea) |
| This paper presents the experimental studies on the estimation of the speed bump on the road by motion sensors embedded in a vehicle. The vehicle motion sensors are used to detect the speed bump because of the limitation of camera and Lidar sensors under certain weather conditions. The shape of the speed bump is estimated by vehicle motion sensors such as a gyro sensor and a height sensor. Experimental studies of the speed bump estimation by a driving vehicle are actually demonstrated. |
|