A5079069715- Dynamics and Control of Mechanical Systems
- Vibration and Dynamic Analysis
- Mechanical stress and fatigue analysis
- Hydraulic and Pneumatic Systems
- Fluid Dynamics Simulations and Interactions
- Iterative Learning Control Systems
- Robotic Mechanisms and Dynamics
- Robotic Locomotion and Control
- Advanced battery technologies research
- Robotic Path Planning Algorithms
- Control and Dynamics of Mobile Robots
- Wireless Sensor Networks and IoT
- Aeroelasticity and Vibration Control
- Vehicle Dynamics and Control Systems
- Force Microscopy Techniques and Applications
- Adhesion, Friction, and Surface Interactions
- Modeling and Simulation Systems
- Advanced Algorithms and Applications
- Composite Structure Analysis and Optimization
- Lubricants and Their Additives
- Real-time simulation and control systems
- Adaptive Control of Nonlinear Systems
- Advanced Control Systems Optimization
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
Chosun University
2008-2024
Royal Society of Chemistry
2024
Centre National pour la Recherche Scientifique et Technique (CNRST)
2024
Yeungnam University
2001
Herein, we present a novel approach for fabricating porous carbon nanotube–polydimethylsiloxane (CNT–PDMS) sponge electrodes piezoelectric/piezoresistive sensing.
A robustness evaluation of input-shaping techniques to reduce residual vibration two-mode flexible systems is presented. Using a benchmark system, the problem illustrated by first applying input shapers designed for only one mode. These simple are effective wide array because amplitude second mode often small, perhaps near noise level. However, single-mode ineffective when contributes substantial oscillation amplitude. Therefore analysis both single- and reveals an inherent compromise...
In this paper, a four-posture control for nonholonomic mobile robots is proposed. Based upon posture velocity error dynamics, the empirical kinematic motion requirements of robot are proposed, and designed in order to generate robustly required moving trajectory with reduction. The controller four possible directions linear angular velocities. robustness confirmed using Lyapunov stability theory. proposed experimentally demonstrated under high acceleration conditions different parameters. It...
In this study, robust input shapers consisting of only three impulses are proposed for reducing the residual deflection flexible systems with acceleration-limit actuators, while maintaining control performance associated system parameter uncertainties. The unequal acceleration and braking delays such actuators can produce large oscillations owing to distortion shaped commands in undamped during rest-to-rest operations. Thus, two types analytically developed using a phase vector approach...
A new method to generate deflection-limiting commands for flexible systems with actuator velocity limits is presented and evaluated. In addition limiting transient deflection, the command profiles reduce residual vibration rest-to-rest motion of oscillatory one dominant mode. beneficial advantage that they are described by closed-form functions system frequency, ratio, limit, force-to-mass desired move distance. The performance evaluated respect duration, oscillation energy, maximum...
A method is proposed for generating on-off commands rest-to-rest slewing of two-mode systems. When the actuators are thrusterjets, command profiles can be designed to use a specified amount fuel. motors or valves, accommodate velocity limit. benefit procedure that it uses closed-form functions system parameters and desired maneuver. The performance evaluated in terms speed, maximum transient deflection, robustness uncertainty. demonstrated with numerical simulation benchmark spacecraft model...
A new method to generate deflection-limiting commands for systems with velocity limits is presented and evaluated. In addition limiting transient deflection, the command profiles reduce residual vibration rest-to-rest motion of oscillatory one dominant mode. beneficial advantage that they are described by closed-form functions system frequency, ratio, limit, actuator force-to-mass desired move distance. The performance evaluated respect duration, oscillation energy, maximum robustness...
A method is proposed for generating on-off commands rest-to-rest slewing of two-mode systems. When the actuators are thruster jets, command profiles can be designed to use any specified amount fuel. beneficial merit presented procedure that expressed by closed-form functions system parameters and desired maneuver. The performances evaluated with respect speed, maximum transient deflection, robustness uncertainty. performance measures compared those bang-coast-bang commands. illustrated using...
Permissions Request permissions Contents list New J. Chem., 2024, 48, 1881 DOI: 10.1039/D4NJ90015D This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this in other publications without requesting further the RSC, provided that correct acknowledgement given. Read more about how to correctly acknowledge RSC content.
Recent research has focused on vanadium redox flow batteries (VRFBs) to address the short lifetimes and fire risks associated with lithium battery systems. While VRFBs offer advantages in safety, they suffer from low energy density efficiency compared batteries. To improve VRFB performance, studies are exploring improvements materials such as anodes, cathodes, separators optimizing operations by controlling electrolyte rates. However, impact of current magnitude been less studied, few...
A negative input shaped command is presented for flexible systems to reduce the residual oscillation under unequal acceleration and braking delays of actuators that are common issues in industrial applications. Against this nonlinearity, a compensated unit magnitude zero vibration (UMZV) shaper analytically developed with phasor vector diagram ramp-step function approximate dynamic response actuators. closed-form solution benchmark system without sacrificing generality simplicity The...
This paper presents robust input shaping commands with first-order actuators utilizing a classical shaper for practical applications in technology. An ideal command can deviate due to actuator dynamics so that the modified has detrimental effect on performance of oscillation reduction feedforward control applications. A zero-vibration-derivative (ZVDF) is analytically proposed using phasor–vector approach, an exponential function approximation dynamic response and usage ZVD shaper. In...
A tribotester with an integrated load sensor based on a strain gauge is typically used to measure the friction coefficient generated by contact-related sliding motion of two objects. Since obtained dividing measured force applied normal force, and forces must be for accurate analysis. In this study, was displacement cantilever tip using fiberoptic in non-contact method. The measurement proven valid calibrating due normal/friction after designing basic structural experiments simulation...
In this paper, deflection-limiting commands are presented with 1st-order actuators to reduce the transient and residual deflection for flexible systems during rest-to-rest operations. The effects of nonlinear resulting from electrical driver, mechanical inertia, friction, or etc. command profiles developed a vector diagram approach by adjusting final magnitude start motion deflection. They described closed-form functions system frequency, ratios, actuator maximum velocity time constants....
본 논문은 비선형 구동기를 포함한 유연시스템의 잔류변위저감을 위한 학습입력성형제어기를 제시한다. 제시되는 제어기는 구동기에 대한 입력성형제어기, 반복최소자승법 및 설계변수 updating rule 을 통합하여 개발된다. 대응한 입력성형제어기 설계변수의 mechanism 개선하기 잔류변위 측정함수가 제시된다. 제시된 제어방법을 pendulum system 에 적용하여 변수추정의 수렴성과 변위저감제어성능의 평가를 통해 수치해석적으로 실용성이 검증된다.
In this paper, two approaches for generating deflection reduction shaping commands are proposed to reduce the transient and residual deflections of flexible systems subject asymmetric first-order actuators. The limited-state in that they consist positive actuations different magnitudes one negative actuation, similar on-off-on commands. Standard on–off commonly used robots, cranes, spacecrafts can degrade control performance conventional input-shaped cause detrimental damage resulting from...
In this paper, an on-off shaping command is presented for reducing the residual oscillation of flexible systems with acceleration limits actuators. The might be operated actuators such as in spacecrafts, cranes and manufacturing machines. Because limited actuators, commands would distorted. non-ideal result to which degrading control accuracy performance. Therefore, analytical solution generation developed by using a vector diagram approach ramp-step function represent actuator response due...
본 논문은 유연시스템에서 발생하는 잔류 변위 저감과 작업자들의 작업속도, 정확도 및 안정성을 제고하기 위한 터치형 원격 입력성형장치를 제시한다. 기존의 pendant와 joystick 인터페이스는 복잡한 작업 현장과 장애물로 인해 생산성이 낮고 인명사고의 위험이 있었다. 이에 대하여 영상센서를 통해 실시간 영상을 출력, TCP connection을 이용하여 Siemens PLC와 데이터를 송/수신, 잔류변위에 입력성형기를 적용하여 장애물 시야 확보와 간편한 버튼 구조 그리고 잔류변위를 저감하는 개발한다. 제시한 신속성과 직관성을 평가 검증한다. 입력성형장치는 mini-bridge crane을 이용한 경로 실험을 잔류변위, 작업속도 생산성 등에서 입력장치대비 성능이 개선되었다.