Ho-Yeon Kim

songwon University · railway driving system

A ten-year-old child chest model is developed for safety assessment in human-robot collision. A spring coefficient for lung and chest vessels (k23) in a Hamilton's nine-year-old child chest model was found to be most sensitive in chest compression for different ages. The parameter value of k23 was calibrated using the experimental data from Hybrid...

A magneto-rheological (MR) damper allows damping characteristics to be continuously controlled by electric signal, and is frequently applied to semi-active vehicle suspension. Hardware-in-the-loop simulation (HILS) of a road vehicle with MR dampers is crucial to overcome the limitations of actual road tests of the vehicle under various conditions....

Precision stopping of an urban train at a railway station with platform screen doors is essential to passenger safety and timely revenue service. This paper presents a precision stopping measurement device to automatically detect the position error of an urban train at a railway station with platform screen doors; the device is used primarily for i...

A tilting train is primarily designed to achieve increased speed in a curved section without causing discomfort to passengers. Ensuring the safety of the tilting control system is one of the most important factors in such a train. This paper presents the development of a hydraulic tilting system that can measure the force in real time to find the c...

Precision stopping of an urban train at a station is prerequisite before starting revenue service due to screen doors. Regulation for precision stopping of the urban train requires ±30 cm in general in Korea. Since there is no device to detect stopping error automatically, it takes long time to gather stopping error data at each station due to manu...

A wheel slide protection (WSP) system of a railway train has the role of reducing excessive wheel slide from brake applications in situations where wheel/rail adhesion is temporarily impaired. The mechanism of the WSP is complex and is related to highly nonlinear dynamics of the train. Hardware-in-the-loop simulation (HILS) for the WSP system can t...

A wheel slide protection (WSP) system of a railway train has the role of reducing excessive wheel slide from brake applications in situations where wheel/rail adhesion is temporarily impaired. The mechanism of the WSP is complex and is related to highly nonlinear dynamics of the train. Hardware-in-the-loop simulation (HILS) for the WSP system can t...

In this paper we deal with a hydraulic tilting actuator to make a diagnosis of load characteristic acting on the tilting actuator of the tilting train. Tilting actuator in the tilting train plays a role of making tilt of the train when the train runs a curve section to make the train run without deceleration. However in the process of tilt the tilt...

Hanvit200 is equipped with an electric actuator that is currently undergoing a test drive. However, there are disadvantages to using the current system for load measurements. This paper presents hydraulic actuators with the same performance as electric actuators for the operating system. The actuator can achieve a tilting angle of ±7° with a tiltin...

This paper presents a scheme and logic of a synchronized move generation of two hydraulic cylinders for a tilting train using a Delta RMC controller. A high speed sampling rate of 1 ms is implemented for accurate motion control. For a systematic design and maintenance, the controller is grouped into three modules; a CPU module including control log...

In this paper a configuration of the load evaluation device for the tilting actuator using hydraulic power is presented, which makes it possible to measure the force action on the tilting actuator. It is possible to measure only current using the conventional electro-mechanical actuator when the bogie is in the process of the tilting. This makes im...

A hydraulic actuation system for a tilting train is usually composed of independent actuators to remove position errors due to bulk modulus of the hydraulic system. For the hydraulic control system using two independent cylinders, this paper presents the modeling of the hydraulic system, control logic, and simulation results of the hydraulic contro...

To maintain the safety and efficiency of railroad vehicles, it is important to understand the working of the brake system with anti-skid control unit (ASCU) for rolling stocks. In this paper, a HILS (Hardware In-the Loop Simulations) system with ASCU hardware (for logic) and a DSP board (for dynamics) is developed to analyze skidding of the Hanvit-...

This paper presents a real-time simulation for the brake system including ASCU hardware component of the Korean tilting train. The dynamic model of the rolling stock is implemented using a dSPACE board and Simulink programs. Dump valve signals are fed back to dSPACE board and wheel speeds are generated by the dynamic model using the feedback signal...

The Korean tilting train called Hanvit 200 was launched recently in Korea to improve train speed up to 200 km/h at conventional lines. In this paper, we propose a HILS system for simulations of mechanical braking of the Hanvit 200 train using actual ASCU, actual dump valves, Simulink, dSPACE board, and ControlDesk software. In the proposed HILS sys...

The presence of low adhesion at the wheel-rail contact point can result in skid of train wheels, and the skid, in turn, results in flats appearing on the wheels. Thus, anti-skid control has a crucial role for safe braking and prevention from flats that could cause a disastrous train accident. This paper presents dynamic modeling of a tilting train...

Traction and braking of trains are due to the rolling contact of the wheel on the rail, and the rolling contact is fundamental to an understanding of the behavior of the railroad system. The way in which the forces are transmitted in the rolling contact is complex and highly nonlinear. This paper describes a rolling contact theory, a creepage model...

The way in which the forces are transmitted in the rolling contact between wheels and rails of rolling stocks is complex and highly nonlinear, and understanding of braking mechanism has a crucial role for the safety and efficiency of railroad vehicle operations. This paper proposes a real-time simulation unit, that is, a HILS system, which is able...

Traction of trains is due to the rolling contact of the wheel on the rail, and the rolling contact is fundamental to an understanding of the behavior of the railroad system. The way in which the forces are transmitted in the rolling contact is complex and highly nonlinear. This paper presents rolling contact phenomena of the wheel on the rail, cree...

A percussive massage robot for senior health care is under development at our Intelligent Control and Robotics Laboratory. This paper presents a conceptual design of the massage robot, forward and inverse kinematic analysis, and Jacobian derivation of the robot manipulator that has 4 degree of freedom motion. Furthermore, the shape and magnitude of...

A peculiar arm-wrestling robot recently developed in our laboratory is basically comprised of a mechanical arm and a control computer. The arm-wrestling robot detects the maximum arm-force of the user in the early stage of the match, generates a different game scenario each time, and executes force feedback control to implement the scenario. This p...

An intelligent arm-wrestling system recently developed in our laboratory is comprised of an arm-force generation mechanism and a control system that detects the maximum arm-force of a user in the early stage of the match, generates a different game scenario each time, and executes force feedback control to implement the scenario. This paper present...