• Smart Structures and Systems
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• 제20권6호
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• pp.657-668
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• 2017

In this research, an active vibration suppression of a smart beam having piezoelectric sensor and actuators is investigated by designing separate controllers comprising a linear quadratic regulator and a neural network. Firstly, design of a smart beam which consists of a cantilever aluminum beam with surface bonded piezoelectric patches and a designed mechanism having a micro servomotor with a mass attached arm for obtaining variations in the frequency response function are presented. Secondly, the frequency response functions of the smart beam are investigated experimentally by using different piezoelectric patch combinations and the analytical models of the smart beam around its first resonance frequency region for various servomotor arm angle configurations are obtained. Then, a linear quadratic regulator controller is designed and used to simulate the suppression of free and forced vibrations which are performed both in time and frequency domain. In parallel to simulations, experiments are conducted to observe the closed loop behavior of the smart beam and the results are compared as well. Finally, active vibration suppression of the smart beam is investigated by using a linear controller with a neural network based adaptive element which is designed for the purpose of overcoming the undesired consequences due to variations in the real system.

• 소음진동
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• 제11권1호
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• pp.147-155
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• 2001

This paper is concerned with the real-time automatic tuning of the multi-input multi-output positive position feedback controllers for smart structures by the genetic algorithms. The genetic algorithms have proven its effectiveness in searching optimal design parameters without falling into local minimums thus rendering globally optimal solutions. The previous real-time algorithm that tunes a single control parameter is extended to tune more parameters of the MIMO PPF controller. We employ the MIMO PPF controller since it can enhance the damping value of a target mode without affecting other modes if tuned properly. Hence, the traditional positive position feedback controller can be used in adaptive fashion in real time. The final form of the MIMO PPF controller results in the centralized control, thus it involves many parameters. The bounds of the control Parameters are estimated from the theoretical model to guarantee the stability. As in the previous research, the digital MIMO PPF control law is downloaded to the DSP chip and a main program, which runs genetic algorithms in real time, updates the parameters of the controller in real time. The experimental frequency response results show that the MIMO PPF controller tuned by GA gives better performance than the theoretically designed PPF. The time response also shows that the GA tuned MIMO PPF controller can suppress vibrations very well.

• 한국기계가공학회지
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• 제12권1호
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• pp.70-76
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• 2013

Recently, the performance and function of electrical and electronic system in automotive vehicles is developing at a rapid rate with the advancement of IT technologies. Combined together with micro-controller and sensor technologies, the Vehicle Smart System (VSS) being developed to improve driver's convenience and comfort has been employed to a variety of applications. In addition to the convenience system, the Auto-parking Assistance System (AAS) that is now attracting a new attention has been already applied to some vehicles, but it is currently limited to luxury car models only. In this paper, we present a fuzzy controller that enables autonomous parking assistance without the AAS. The controller can perform the assistance with information provided from moving status, current position and steering angle as one is able to park a car based on his/her experience and knowledge for driving and parking. We have evaluated its performance of the proposed controller by simulation and tested the excellence of the controller by building a model vehicle embedded with the micro-controllers.

• International journal of advanced smart convergence
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• 제12권1호
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• pp.31-40
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• 2023

This asymed drone controller is indispensable for two components: Guidance and Controller. In which the Ministry of Guidance will receive waypoints from which to form an orbit then combine the data with the current location of the vessel, thereby calculating and also supplying the controller to drive the vehicle to follow the outlined trajectory. This article will use the Line Of Sight (LOS) algorithm to design the Guidance and Controller sets. The result as well as the effectiveness of the controller will be shown through matlab/SIMULINK simulation.

• 감성과학
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• 제10권3호
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• pp.331-342
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• 2007

본 연구에서는 MP3스마트웨어 상용화를 위한 디자인 프로토타입을 개발하였다. 본 연구에서 개발한 MP3 스마트웨어는 MP3 플레이어, 리모컨 모듈, 이어폰이 하나의 키트(One-kit) 형태로 되어 있으며 조립과 분리가 용이하다. 개발된 의류는 재킷타입의 MP3-YSJ(Yonsei Smart Jacket)와 사파리타입의 MP3-YSS(Yonsei Smart Safari)의 2종류의 MP3스마트웨어 였다. 2종류의 스마트웨어를 대상으로 한 두 차례의 사용성 평가가 각각 모듈별 평가와 항목별 평가로 진행되었다. 모듈별 평가는 외관, 소재, 음악컨트롤러, 이어폰/스피커, 커넥터였고 항목별 평가는 사회적 수용성,착용감,유용성,관리용이성,안전성을 평가하였다. MP3-YSJ 1.0과 MP3-YSS 1.0을 대상으로 한 1차 사용성 평가에서는 모듈별 평가는 전체적으로 긍정적인 결과를 보여주었다. 또한 항목별 평가에서는 MP3-YSJ 1.0와 MP3-YSS 1.0모두 다른 항목에 비해 사회적 수용성이 약간 낮게 평가되었고, 커넥터의 관리 용이성과 음악컨트롤러의 사회적 수용성이 낮게 나타났다. 2차 사용성 평가는 1차 사용성 평가 결과를 반영하여 개발된 제품을 대상으로 실시하였다. MP3-YSS 2.0은 음악 컨트롤러의 사회적 수용성과 관리용이성, 커넥터의 관리용이성이 개선이 필요한 항목으로 밝혀졌고, MP3-YSS 2.0의 경우에는 음악컨트롤러로의 사회적 수용성, 커넥터의 사회적 수용성, 소재의 관리용이성이 개선이 필요한 항목으로 나타났다. 특히 사용자는 키패드의 배치 때문에 사회적 수용성 측면에서 불편을 느꼈다. 음악컨트롤러의 사회적 수용성 문제를 보완하기 위해서는 음악컨트롤러의 키패드 인터페이스에 대해 보다 구체적인 연구가 필요하다.

• International Journal of Computer Science & Network Security
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• 제22권4호
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• pp.1-12
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• 2022

In order to overcome the power fluctuation issues in photovoltaic (PV) smart grid-connected systems and the inverter nonlinearity model problem, an adaptive backstepping command-filter and a double second order generalized Integrators (DSOGI) controller are designed in order to tune the AC current and the DC-link voltage from the DC side. Firstly, we propose to present the filter mathematical model throughout the PV system, at that juncture the backstepping control law is applied in order to control it, Moreover the command filter is bounded to the controller aiming to exclude the backstepping controller differential increase. Additionally, The adaptive law uses Lyapunov stability criterion. Its task is to estimate the uncertain parameters in the smart grid-connected inverter. A DSOGI is added to stabilize the grid currents and eliminate undesirable harmonics meanwhile feeding maximum power generated from PV to the point of common coupling (PCC). Then, guaranteeing a dynamic effective response even under very unbalanced loads and/or intermittent climate changes. Finally, the simulation results will be established using MATLAB/SIMULINK proving that the presented approach can control surely the smart grid-connected system.

• 조명전기설비학회논문지
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• 제24권9호
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• pp.56-61
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• 2010

Scanning head has used to detect the error signal in register controller. However the resolution of the system is not enough for E-printing(Electronic-paper printing). In this paper, the register mark shapes and process techniques are studied using a smart camera which can detect the register mark and calculate the printing error. With these, a register controller within 10[um] of error range is developed for e-printing system and confirmed with experiments.

• 전력전자학회논문지
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• 제24권4호
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• pp.229-236
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• 2019

This study proposes a DC-DC converter topology of solid-state transformer for low-voltage DC distribution. The proposed topology consists of a voltage balancer and bipolar DC-DC converter. The voltage and current equations are obtained on the basis of switching states to design the controller. The open-loop gain of the controller is achieved using the derived voltage and current equations. The controller gain is selected through the frequency analysis of the loop gain. The inductance and capacitance are calculated considering the voltage and current ripples. The prototype is fabricated in accordance with the designed system parameters. The proposed topology and designed controller are verified through simulation and experiment.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2014년도 추계학술대회 논문집
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• pp.117-118
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• 2014

This paper presents a new smart power module for 100[kVA] inverter. In the inverter, the three smart modules are used and those are installed at the each pole of the inverter. Each module receives the switching functions from the inverter main controller, and generates duty ratio for IGBTs' switching of the pole. For the reliable operation of the inverter, CAN communication is used for transferring the switching functions form the main controller to the modules. Experiments verify the performance of the smart power module installed in 100[KVA] inverter.

• Smart Structures and Systems
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• 제1권3호
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• pp.283-308
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• 2005

This paper features about the modeling and design of a fast output sampling feedback controller for a smart Timoshenko beam system for a SISO case by considering the first 3 vibratory modes. The beam structure is modeled in state space form using FEM technique and the Timoshenko beam theory by dividing the beam into 4 finite elements and placing the piezoelectric sensor/actuator at one location as a collocated pair, i.e., as surface mounted sensor/actuator, say, at FE position 2. State space models are developed for various aspect ratios by considering the shear effects and the axial displacements. The effects of changing the aspect ratio on the master structure is observed and the performance of the designed FOS controller on the beam system is evaluated for vibration control.