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굴삭기 작업 모의 동작에 의한 연비 시험 방법 평가 연구(I)
강주영(J. Y. Kang),최진구(J. G. Choi),이정호(J. H. Lee),이충근(C. G. Lee),이대엽(D. Y. Lee) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.11
This work is to measure and evaluate the fuel consumption of an excavator using a work simulated motion. In order to evaluate the contribution of each actuator on fuel consumption, fuel consumption rate was measured and analyzed while only one actuator is working. Whereas the reported test method, JCMAS, uses empty bucket, several weights are added to bucket, which shows an increase of fuel consumption depending on weight. In this work, engine load and rpm are measured while executing both dig and dump motion and leveling motion. Since as engine RPM increases fuel consumption becomes larger, it is necessary to consider engine operating parameters such as percent load and rpm to make a standard test method in near future.
강주영(J. Y. Kang),오승엽(S. Y. Oh),최진구(J. G. Choi),이정호(J. H. Lee),이충근(C. G. Lee),고상철(S. C. Ko),서지원(J. W. Seo),이대엽(D. Y. Lee) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.6
While the fuel economy of passenger vehicles are measured using a chassis dynamometer, that of construction machinery such as excavators is presumably measured by standard work cycle, which is under examination abroad. In order to measure the fuel consumption under standard work cycle, a measurement methodology, while excavator operates in dynamic(transient) motion, needs to be examined and evaluated. In this work, three methods, such as gravimetry, ECU CAN signal and mass flow meter, are studied and compared. This work reveals that when ECU CAN signal is evaluated compared to gravimetry or mass flowmeter, it could be used to measure the fuel consumption with accuracy and thus evaluate and approve the fuel economy of construction machinery, which will be implemented in near future A further study is scheduled to implement the measurement method at standard work cycle.
이재혁(J. H. Lee),조예찬(Y. C. Jo),장재원(J. W. Jang),고경주(K. J. Ko),박정현(J. H. Park),최병희(B. H. Choi),최성운(S. W. Choi),조상훈(S. H. Cho),이대엽(D. Lee) 유공압건설기계학회 2023 유공압건설기계학회 학술대회논문집 Vol.2023 No.5
The use for driving robots is increasing in tests of electric construction machinery and automotive using chassis dynamometer that require long hours of operation in order for battery SOC tests. Existing driving robots are not very convenient, such as taking a lot of time to install. Therefore, in this study, basic research was conducted for the development of a driving robot that reduced the installation time and improved the followability of the reference speed profile by using deep learning. In order to follow the speed profile of the standard test cycle according to the regulations, a base study that can control the throttle by using the visual information in real time was conducted using a rig device and deep learning. Based on the results of this study, it is planned to conduct follow-up studies using test vehicle and chassis dynamometer in the next stage.
천공유압드릴 장비에서 작업 동작에 따른 연비 측정 및 평가 기술 연구
최진구(J. G. Choi),강주영(J. Y. Kang),김종민(J. M. Kim),배종원(J. W. Bae),이충근(C. G. Lee),이정호(J. H. Lee),김주호(J. H. Kim),이대엽(D. Y. Lee),송윤우(Y. W. Song),김명보(M. B. Kim),조재상(J. S. Cho) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.11
In order to improve the fuel economy of a hydraulic drilling machine, which consumes relatively large amount of fuel compared to other typical construction machinery, a comparison is made between gravimetric fuel consumption using mass flowmeter and CAN signal. And, since the data of CAN signal is close enough to the measured data of a flowmeter, fuel consumption at real work mode is measured and analyzed using CAN signals. A result show that drilling mode occupies about 67.4% of total fuel consumption. It is concluded that this work may contribute to enhance fuel economy of hydraulic drilling machines.
최병희(B. H. Choi),조예찬(Y. C. Jo),박정현(J. H. Park),최성운(S. W. Choi),조상훈(S. H. Cho),김바다(B. D. Kim),박기협(K. H. Park),김주호(J. H. Kim),이대엽(D. Lee) 유공압건설기계학회 2023 유공압건설기계학회 학술대회논문집 Vol.2023 No.5
In many equipment, including construction machinery that operates with hydraulic oil, it is very important to solve the problem of the generation of fine particles in the hydraulic circuit and the inability to use the equipment due to causes such as damage of parts and repair. In this study, as a base study to solve these problems, a study that can detect the color change of hydraulic oil due to particles mixed in hydraulic oil in real time using machine learning was conducted. Using the k-NN classification algorithm, the color change of hydraulic oil is classified into ten classes so that the color can be recognized in real time. It is planned to carry out the development of the sensor system in the following study.
기상 환원제를 사용하는 선택적 환원촉매에서 유동혼합 개선에 관한 연구
고상철(S.C. Ko),이범호(B.H. Lee),조승환(S.H. Cho),이상헌(S.H. Lee),홍성태(S.T. Hong),이대엽(D.Y. Lee) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.1
Since emission regulations for vehicles have become more stringent, SCR technology has drawn a strong attention in order to reduce NOx emissions. Optimal design of a reductant injection nozzle and a multi-hole plate located between the cone and catalyst is critical in that the uniform distribution of reductant is necessary to maximize the NOx conversion efficiency and minimize the slip of reductant in SCR. In this work, an LPG fuel(C3H8 in vapor state) was used as a reductant for LPG vehicles. A Realizable k-ε model is used for turbulence, and SCR body is defined as porous media with inertia and viscous resistances measured in this work. Effect of the number of nozzle holes on the flow mixing index was analyzed, which revealed that a four hole nozzle shows the best performance in terms of uniformity of flow. An installment of a multi-hole plate at the entrance of catalyst was evaluated with flow mixing index, uniformity of flow, and pressure drop. A multi-hole plate with gradual hole diameter change in three steps showed the best uniformity of flow within the conditions suggested in this work.
굴삭기 작업 모의 동작에 의한 연비 시험 방법 평가 연구(II)
최진구(J. G. Choi),강주영(J. Y. Kang),이정호(J. H. Lee),이충근(C. G. Lee),김주호(J. H. Kim),이대엽(D. Y. Lee) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.11
This work to evaluate a test method to measure fuel consumption of excavators using work simulated motion. For this, a mass flowmeter, to measure fuel consumption in real time, is installed on an excavator. In order to measure the rotational angles within the accuracy of approximately about 14 centimeters, respectively, for bucket, arm, boom, swing, potentiometers are installed at the rotational center of each actuator. When the relation between rotational angle and fuel consumption was analyzed, which has revealed the fuel consumption due to swing is largest. Since fuel consumption varies depending on driving skill of a driver, this work may contribute not only to evaluate a standard method to measure fuel economy of excavators but also to enhance the driver"s driving skill to improve fuel economy at work sites of excavators.