도로공사 중 발견된 동굴에 대한 교량적용 사례

부상필(Boo, Sangpil),문경태(Moon, Kyoungtae),박상렬(Park, Sangyeol) 대한토목학회 2020 대한토목학회 학술대회 Vol.2020 No.10

제주도에는 화산활동에 의해 형성된 용암동굴이 지하 곳곳에 분포하고 있다. 본 사례에서는 도로공사 중 발견된 용암동굴의 보존을 위해 문화재청의 진동기준을 만족하도록, 공사중 장비사용에 의한 진동을 측정하였다. 공사완료 후 차량하중에 의한 동굴의 안정성을 평가하기 위하여 토공(성토) 시공시 및 교량 적용시에 대한 동적해석을 실시하여 진동치를 예측하였다. 본 사례를 통하여 향후 동굴이 발견되는 경우에 동굴의 안정성과 경제적인 공법을 적용할 수 있는 기초자료로 제공하고자 한다.

Speed Control Based on Adaptive Neuro-Fuzzy Inference System for Permanent Magnet Direct Current Motor

S. Z. Moussavi,Sh. Javadi,M. Alasvandi,E. Morad 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12

Intelligent control that can be used learning ability and human experiences, is widely used in industrial application such as motors speed control. This paper presents Proportional-Integral-Derivative Controller (PID controller) based on Adaptive Neuro-Fuzzy Inference System (ANFIS) for Permanent Magnet Direct Current (PMDC) motor. ANFIS provides combination of artificial neural network and fuzzy inference systems therefore ANFIS uses advantages of them simultaneously. The proposed PID controller Coefficients are determined by ANFIS. The proposed controller based system is compared with Internal Model Control (IMC) PID controller based system. The Comparison shows that proposed controller improves characteristics in different conditions such as no load, increasing reference speed, applied load and noisy load. Proposed controller based system can improve system performance by smaller fuzzy rule set.

유압장치용 전기모터 회전속도 제어시스템의 특성 비교

정헌술(Heon-Sul Jeong),정승욱(Seung-Wook Jeong) 유공압건설기계학회 2009 유공압건설기계학회 학술대회논문집 Vol.2009 No.11

Hydraulic systems are widely used as a power transfer and/or power control system due to its flexibility, controllability, accuracy and high power density. Valve controlled and/or pump controlled systems are normally was adopted as a control device, but nowadays motor controlled systems are emerging as new energy-efficient hydraulic control systems. In this paper the motor controlled system for the cylinder position control of a counter balance circuit is investigated by using AMESim simulation study. And position control experiments was carried out verifying the possibility and efficiency of the motor controlled system.

고속철도차량 해치시스템 동작 특성을 고려한 제어기 설계

김재문,박재호,공동영,이치영,김철수 대한전기학회 2022 전기학회논문지 Vol.71 No.12

A fore section of a high-speed train best expresses the characteristics of the vehicle and is functional by reducing air resistance. The controller of the existing hatch system is designed as a PLC, so it is possible to modify the control circuit without physically changing wiring or relays. However, it is not standardized as each foreign manufacturer provides software in different languages. Therefore, when a failure of the PLC itself occurs, it is impossible to identify the cause, so there is a disadvantage in that response to system failure is delayed. In this paper, the requirements for the controller were derived through the analysis of the operation characteristics and functions of the existing high-speed train hatch system controller. In addition, the hatch system controller was designed by analyzing the operation sequence of the hatch system. And considering the future improvement of the hatch system, the controller was designed as a PCB type that is easy to expand. The normal operation of the controller was tested by virtually applying the hatch operation input signal and the sensor input signal. As a result of the experiment, it was confirmed that the hatch system status output signal and the pneumatic valve control output signal were controlled according to the hatch system operation sequence.

Design and implementation of a GIS-based accident management system using tracking technique

Niaraki Abolghasem Sadeghi,Kim Kye-Hyun Korea Spatial Information System Society 2006 한국공간정보시스템학회 논문지 Vol.8 No.2

This paper addresses a GIS (Geographic Information System) based system in order to reduce the rate of public transportation accidents occurring in Iranian roads network. Over the years, the road accidents are a major issue throughout the world. Today, particular consideration is given to those technologies which can lead to diminish on the number of critical incidents. One of the main factors resulting in accidents and fatalities rates growth is the speed violation of buses in Iranian road network. The conventional speed controlling approach in Iran based on the Tachograph which records vehicle's speed, time, and stoppage in the mechanical processing has many problems. Hence, this research is intended to design and implement a GIS-based system to manage road accident of Bus transportation system using offline tracking system. This was accomplished using a GIS-based technique that encompasses three steps. The first step is developing a GIS-based accident system. The second step includes designing and applying a tracking system inside 90 buses for recording Bus information for speed controlling. Lastly, by using mentioned system in police center, the illegal drivers' punishment would be considered properly. Overall, this system has been successfully applied in this work. Therefore, the police and transportation office are able to control and make policy to diminish the number of accident. It is anticipated that online tracking system through the Web GIS would be utilized In this system in the near future.

가변속 냉동시스템의 비간섭제어를 위한 실험적 모델

이화(Li Hua),이동우(D. W. Lee),정석권(S. K. Jeong) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-

This paper deals with an empirical model for decoupling control to control the refrigeration system effectively. The conventional control schemes of the system are mainly focused on representative two control methods, superheat control and capacity control. The capacity control is basically conducted to respond partial loading conditions on the purpose of energy saving. The superheat control is mainly carried out to maintain maximum coefficient of performance (COP). In the variable speed refrigeration system, the capacity and the superheat are controlled by inverters and electronic expansion valves respectively for saving energy and improving cost performance. The capacity and superheat can not be controlled independently because of interfering loop when the compressor speed and opening angle electronic expansion valve is varied. Therefore, we suggest decoupling model to eliminate the interfering loop at first. Next, each transfer function in decoupling control model is obtained from number of experiments.

PI Control with the Smith Predictive Controller for a Variable Speed Refrigeration System

Hua, Li,Choi, Jeong-Pil,Jeong, Seok-Kwon,Yang, Joo-Ho,Kim, Dong-Gyu The Society of Air-Conditioning and Refrigerating 2007 International Journal Of Air-Conditioning and Refr Vol.15 No.3

In this paper, we suggest PI control with the Smith predictive controller to improve transient response of a variable speed refrigeration system (VSRS). As the refrigeration system has long dead time inherently, it is difficult to get fast responses of super-heat and reference temperature. We incorporated the Smith predictive controller into PI to compensate the effect of the long dead time of the system. At first, we introduced the decoupling model of the system to control capacity and superheat simultaneously and independently. Next, we designed the predictive controller of the superheat based on PI control law. Finally, the control performance by the proposed method was investigated through some numerical simulations and experiments. The results of the simulations and experiments showed that the proposed PI control with the predictive controller could obtain acceptable transient behaviour for the system.

인버터를 갖는 가변속 냉동ㆍ공조시스템의 Decoupling 제어

LI HUA,이동우(Dong-Woo Lee),정석권(Seok-Kwon Jeong) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6

In this paper, we suggest the decoupling control method based on general PI control law to control the refrigeration system effectively. The conventional control schemes of the system are mainly focused on representative two control methods, superheat control and capacity control. The capacity control is basically conducted to respond partial loading conditions on the purpose of energy saving. The superheat control is mainly carried out to maintain maximum coefficient of performance (COP). In the variable speed refrigeration system, the capacity and the superheat are controlled by inverters and electronic expansion valves respectively for saving energy and improving cost performance. The capacity and superheat can not be controlled independently because of interfering loop when the compressor speed and electronic expansion valve opening angle are varied. Therefore, we suggest decoupling model to eliminate the interfering loop at first. Next, each transfer function in decoupling control model is obtained from number of experiments. At last, we will prove that the suggested decoupling control method can establish not only precise control but also high COP of the variable speed refrigeration system.

가변속 냉동시스템의 PI 제어기 설계

Li Hua,이동우(D. W. Lee),정석권(S. K. Jeong) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-

This paper describes PI controller design to control the variable speed refrigeration system effectively. The conventional control schemes of the system are mainly focused on representative two control methods, superheat control and capacity control. In the variable speed refrigeration system, the capacity and the superheat are controlled by inverters and electronic expansion valves respectively for saving energy and improving cost performance. The capacity and superheat can not be controlled independently because of interfering loop when the compressor speed and opening angle electronic expansion valve is varied. Therefore, we suggest decoupling model to eliminate the interfering loop at first. Next, we designed PI controller and investigated the control performance through some numerical simulations.

적외선 시스템을 이용한 경사 지역에서 열차 운행 속도 제어

아흐마드 수기아나(Ahmad Sugiana),물요 사뇨토(Mulyo Sanyoto),파르위토(Parwito),야나르디안 악리얀토(Yanardian Agrianto),이기서(Key Seo Lee),최익(Ick Choy) 한국전자통신학회 2016 한국전자통신학회 논문지 Vol.11 No.6

열차 속도 제어는 운영 트랙에서 안전 운동을 구축하기 위한 열차 보호의 중요한 일부분이다. 경사진 면적과 같은 열차를 보호하는 데 필요한 트랙의 특수한 조건이 있다. 더욱이 반달리즘 문제를 가진 개도국에서 특수한 조건은 트랙 사이드의 장비를 최소화하기 위한 설치가 요구된다. 더욱이 열대 국가에서 트랙 사이드는 수질에서 트랙 사이드 장비의 성능에 영향을 줄 것으로 보인다. 이러한 문제를 해결하기 위하여 적외선 시스템을 이용하여 경사진 면적에 대하여 열차 속도 제어를 제안한다. 전주 배열의 설치에 의해 이 시스템은 보다 적은 도전, 경제적인 민감성, 트랙 사이드의 장비의 최소 설치와 강우 환경에서 신뢰성을 제공한다. 본 논문은 경사진 면적에서 성능 평가를 측정하고 열차 속도를 제어하는데 중점을 준다. 제안한 열차 속도 제어 시스템은 시간 당 약 20km의 제어속도와 최대 3.6%의 경사진 면적에서 속도 제어와 감시가 가능하다. Train speed control is a vital part of train protection to build safe movement at an operation track. There is a special condition of track that needs more attention to protect the train, for example in slope area. Moreover, in developing country with vandalism problem, it requires to install minimalized equipment on the trackside. In addition, in tropical country, on tracksides it will be potentially pooling water that influences to the performance of trackside equipment. To address these problems, we propose the train speed control for slope area using infrared system. By installing on the pole configuration, the system offers a less challenging, economically sensible, minimalized installation of equipment on the trackside and reliability for heavy rain environment. This paper concentrates on the controlling train speed and measurement performance evaluation in slope area. The proposed train speed control system can monitor and control the speed in sloping area with maximum 3.6% and controlled speed about 20 km per h.