• 환경영향평가
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• 제28권6호
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• pp.592-603
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• 2019

본 연구는 하수처리시 가장 많은 에너지가 소비되는 송풍기의 효과적인 제어를 통한 저에너지 하수관리기술 구현에 관한 것으로, 미생물에 필요한 산소의 양을 산정함에 있어 생물반응조내 운전지표나 방류수의 원격수질감시체계(Tele-Monitoring System, TMS) 데이터를 활용하는 기존방식과 달리 하수처리 시설로 유입되는 하수의 CODcr, NH₄⁺-N 농도변화를 유입단에서 미리 감지하여 송풍에너지를 절감하고자 하였다. 사용된 사전감지기술은 기존 상용화된 제품과 비교 시 높은 상관관계를 보였다. 사전감지기술과 연계하여 송풍기를 자동제어한 결과 인력에 의한 수동제어방식에 비해 평균 9.9%의 송풍에너지를 줄일 수 있음이 확인되었다. 이처럼, 유입단에서 유입하수를 사전감지할 경우 실시간으로 유입수질의 변동파악 및 송풍량 제어가 가능해져 인력에 의한 수동운전방식에 의존하고 있는 다수 하수처리시설에 적용시 저에너지 하수처리를 기대할 수 있으며, 이를 통해 온실가스 배출 절감에 기여할 수 있을 것으로 판단된다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.516-519
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• 1997

In this paper, the control of the temperature for the vehicle air conditioner is implemented with the fuzzy controller using a micro controller. The linguistic control rules of the fuzzy controller are separated into two out variables(multi input multi output ; MIMO) : one is those for the blower motor, and the other is those for air mix door. The error in fuzzy controller, the input variable is defined as difference between the reference temperature and the actual temperature in the cabin room. The fuzzy control rules are established from the human operator experience, and based engineering knowledge about the process. The method of the center of gravity is utilized for the defuzzification.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.34-39
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• 2007

Condensing gas boiler units may make a big role for the reduction of energy consumption in heating industries. In order to decrease the energy consumption of a condensing gas boiler unit, the effective operations and controls of the system are necessary. In this study, mathematical models of a condensing gas boiler system were developed and programmed in order to predict dynamic behaviors of the system. These include dynamic models for a blower, a gas valve, a pump, a burner, a boiler heat exchanger, and a hot water heat exchanger. Control algorithms for the control of a gas valve, a blower, and a pump were also assumed. Simulation results showed good predictions of the dynamic phenomena of a boiler system. Therefore, the simulation program developed for this study may be effectively used for the development of control algorithms of the boiler system.

• 한국수소및신에너지학회논문집
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• 제25권5호
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• pp.509-515
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• 2014

At the fuel processing system (FPS) of fuel cell vehicle, hydrogen recirculation blower (HRB) is used for the recirculation of remained hydrogen after reaction. In this paper, noise and vibration improvement of HRB is studied by changing design and control. It is checked the campbell diagram and critical speed for stability of rotor, and housing stiffness is improved using simulation of frequency response function (FRF). A method is suggested that can decrease the unbalance amount of the rotor and impeller which main source of noise and vibration. In order to reduce the noise during deceleration of blower, electrical braking is applied and tested the risk impact of durability. Founded the optimum switching frequency of the motor control, and reduced the idle rpm by increasing of aerodynamic performance. The superiority of paper is proved by measurement of the improved product's noise and vibration.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.98-100
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• 1999

This paper presents very simple driving system for blower of separator. The system be driven by V/F control. The load of the system have hardly variation during steady state, because of fan load. We have studied about the property of the fan load in order to develop driving system for blower of separator. This study can get reduction of energy, high separation rate of a raw of tobacco and high quality.

• Journal of Ship and Ocean Technology
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• 제7권1호
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• pp.19-28
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• 2003

The systematic results of anti-rolling tanks tests obtained by bench tester and roll test in towing tank have been examined. The effects on the oscillating period of fluid transfer through the duct of U-tube tank due to damper plates and the effects on roll damping moment of the tank due to swash plates are alto evaluated from the results. A simple control algorithm for a forced fluid transfer in U-tube tanks if devised to active operation of the tank by air blower. The active performances of the tank are confirmed very effective through the tank tests carried out in the irregular waves.

• 전기학회논문지
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• 제67권11호
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• pp.1477-1485
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• 2018

There are two major issues for activated sludge process in sewage treatment plant. One is how to make sewage be more clean and the other is the energy saving in sewage treatment process. The major monitoring sewage qualities are chemical oxygen demand, phosphorus, nitrogen, suspended solid in effluent. These are transmitted to the national TMS(Telemetry Monitoring System) at every hour. If these exceed the environmental standard, the environmental charges imposed. So, these water qualities are to be controlled below the environmental standard in operation of sewage treatment plant. And recently, the energy saving is also important in process operation. Over 50% energy is consumed in blowers and motors for injection oxygen into aeration tank. So, with the water qualities to be controlled below the environmental standard, the energy saving also is to be accomplished for efficient plant management. Almost researches are aimed to control water quality without considering energy saving. AI techniques have been used for control water quality. AI modeling simulator provided the optimal control inputs(blower speed, waste sludge, return sludge) for control water quality. Blower speed is the main control input for activated sludge process. To make sewage be more clean, the excessive blower speed is supplied, but water quality is not better than the previous. In results, non necessary energy is consumed. In this paper we propose a new method that the energy saving also is to be accomplished with the water qualities to be controlled below the environmental standard for efficient plant management. Water qualities in only aeration tank are used the inputs of fuzzy models. Outputs of these models are chemical oxygen demand, phosphorus, nitrogen, suspended solid in effluent and have the environmental standards. In test, we found this method could save 10% energy than the previous methods.

• 한국산학기술학회논문지
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• 제15권7호
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• pp.4659-4664
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• 2014

산업 현장에서 발생하는 소음은 작업자의 건강과 작업 효율에도 영향을 줄 뿐 아니라, 주변의 주거지역의 소음 민원의 원인이 된다. 본 논문에서는 중소규모 공장에서 많이 사용되는 송풍기에서 발생하는 소음을 3차원 공간에서 능동소음제어기(ANC)를 이용하여 저감하는 기술 개발을 위한 기초 연구를 수행하였다. 이를 위해 ANC의 설정과 결과 데이터를 용이하게 파악할 수 있는 시뮬레이터 프로그램을 Labview를 이용하여 작성하여 음압레벨, 스펙트럼, 등가소음도 등의 데이터를 비교하였다. 소음 데이터는 현재 중소규모 공장에서 운전 중인 터보팬 송풍기에서 발생하는 소음을 기기 주변 17개의 위치에서 녹음하여 사용하였다. 모의실험 결과 17 지점 모두 500Hz 이하 저주파 대역에서 파워 스펙트럼이 최대 40dB 줄었으며 등가소음레벨이 평균 12.6dB 감쇄되는 결과를 보였다.

• 전기전자학회논문지
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• 제26권4호
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• pp.596-601
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• 2022

최근 친환경 선박 전환 추세에 따라 EGR 시스템 적용이 증가되고 있다. EGR 시스템의 주요 부품 중 하나인 EGR 블로워는 공력시스템과 이를 구동하는 e-모터 및 인버터 등으로 구성되며, 에너지밀도가 높고 효율 특성이 우수한 영구자석형 동기전동기가 적용되고 있다. 한편, EGR 블로워용 모터의 경우 국내 중소조선기자재 기업들의 개발이 활발하지만, 선박에 탑재되는 인버터는 까다로운 선급인증을 획득해야 되므로 주로 글로벌 선진기업에서 개발한 범용 인버터가 사용되고 있다. 범용 인버터는 자가 튜닝 등 편리한 구동 기능을 갖고 있지만, 최적 제어 실패 시, 사용자 입장에서 원인을 분석하기 어려운 단점이 있다. 본 연구에서는 EGR 블로워용 SPMSM의 최적제어를 위한 전류 벡터 제어 및 Tracking observer를 설계 및 검증하여 범용 인버터의 최적제어 실패원인을 분석하고자 한다.

• 설비공학논문집
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• 제23권6호
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• pp.441-448
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• 2011

The energy consumption of a condensing gas boiler may be greatly reduced by the effective operation of the unit. In this study, the supply water algorithm for a condensing gas boiler control was developed by using the fuzzy logic. This includes the supply water set temperature algorithm, and the control algorithms of a gas valve, a blower and a pump. For the set temperature algorithm, the outside air temperature and the return water temperature were used as input variables. The supply water temperature difference and its slope were used as input variables of the gas valve and blower control algorithm. And the supply water temperature and the return water temperature were used as input variables of the pump control algorithm. In order to analyse performances of these algorithms, the dynamic model of a condensing gas boiler was used. The initial start-up test, the supply water set temperature change test, the outside air temperature change test, and the return water temperature change test were performed. Simulation results showed that algorithms developed in this study may be practically applied for the effective control of a condensing gas boiler.