• Title/Summary/Keyword: New concept engine

Search Result 112, Processing Time 0.024 seconds

Ubiquitous Architectural Framework for UbiSAS using Context Adaptive Rule Inference Engine

  • Yoo, Yoon-Sik;Huh, Jae-Doo
    • Proceedings of the Korea Society of Information Technology Applications Conference
    • /
    • 2005.11a
    • /
    • pp.243-246
    • /
    • 2005
  • Recent ubiquitous computing environments increasingly impact on our lives using the current technologies of sensor network and ubiquitous services. In this paper, we propose ubiquitous architectural framework for ubiquitous sleep aid service(UbiSAS) in the subset of ubiquitous computing for refreshing of human's sleep. And we examine technical feasibility. Human can recover his health through refreshing sleep from fatigue. Ubiquitous architectural framework for UbiSAS in digital home offers agreeable sleeping environment and improves recovery from fatigue. So we present new concept of ubiquitous architectural framework dissolving stress. Specially, we apply context to context-aware framework module. This context is transferred to context adaptive inference engine which has service invocation function in intelligent agent module. Ubiquitous architectural framework for UbiSAS using context adaptive rule inference engine without user intervention is technical issue. That is to say, we should take sleep comfortably during our sleeping. And sensed information during sleeping is changed to context-aware information. This presents significant information in context adaptive rule inference engine for UbiSAS. This information includes all sleeping state during sleeping in context-aware computing technique. So we propose more effective and most suitable ubiquitous architectural framework using context adaptive rule inference engine for refreshing sleep in this paper.

  • PDF

Preliminary design on the thrust measurement system for vertical firing test stand of the liquid rocket engine combustion chamber (액체로켓엔진 연소기 수직형 연소시험설비의 추력측정시스템 기본설계)

  • Kim, Ji-Hoon;Kim, Seung-Han;Lee, Kwang-Jin;Han, Yeoung-Min;Park, Bong-Kyo;Hu, Sang-Bum
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2012.05a
    • /
    • pp.574-577
    • /
    • 2012
  • Thrust measuring is one of the crucial factor to decide the performance of a liquid rocket engine when the engine development test, especially for the combustion chamber, is implemented. Calculating the thrust from a combustion pressure is used when direct measuring the thrust is impossible, but direct measuring the thrust is necessary and various methods for doing it more precisely should be considered. This paper introduces the preliminary design concept about the new thrust measurement system for the vertical firing test stand, which is introduced domestically for the first time, of a liquid rocket engine combustion chamber.

  • PDF

Experimental Study on the Performance Characteristics of Air Hybrid Engine (Air hybrid 엔진의 구동 특성에 관한 실험적 연구)

  • Lee, Yong-Gyu;Kim, Yong-Rae;Kim, Young-Min;Park, Chul-Woong;Choi, Kyo-Nam;Jeong, Dong-Soo
    • Journal of the Korean Institute of Gas
    • /
    • v.15 no.5
    • /
    • pp.50-56
    • /
    • 2011
  • A preliminary experimental study of new concept air hybrid engine, which stores compressed air in the tank during braking and re-use it to propel vehicle during crusing or acceleration, was carried out in this study. A single cylinder engine was modified to realize the concept of air hybrid engine. Independent variable valve lift system was adopted in one of the exhaust valves to store the compressed air into the air tank during compression period. An air injector module was installed in the place of spark plug, and the stored compressed air was supplied during the expansion period to realize air motoring mode. For air compression mode, the tank with volume of 30 liter could be charged up to more than 13 bar. By utilizing this stored compressed air, motoring work of 0.41 bar of IMEP(Indicated mean effective pressure) at maximum can be generated at the 800rpm conditions, which is higher than the case of normal idle condition by 1.1 bar of IMEP.

Automatic Algorithm for Extracting the Jet Engine Information from Radar Target Signatures of Aircraft Targets (항공기 표적의 레이더 반사 신호에서 제트엔진 정보를 추출하기 위한 자동화 알고리즘)

  • Yang, Woo-Yong;Park, Ji-Hoon;Bae, Jun-Woo;Kang, Seong-Cheol;Kim, Chan-Hong;Myung, Noh-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.25 no.6
    • /
    • pp.690-699
    • /
    • 2014
  • Jet engine modulation(JEM) is a technique used to identify the jet engine type from the radar target signature modulated by periodic rotation of the jet engine mounted on the aircraft target. As a new approach of JEM, this paper proposes an automatic algorithm for extracting the jet engine information. First, the rotation period of the jet engine is yielded from auto-correlation of the JEM signal preprocessed by complex empirical mode decomposition(CEMD). Then, the final blade number is estimated by introducing the DM(Divisor-Multiplier) rule and the 'Scoring' concept into JEM spectral analysis. Application results of the simulated and measured JEM signals demonstrated that the proposed algorithm is effective in accurate and automatic extraction of the jet engine information.

A Study on the Effect of Compression Ratio and EGR on the Partial Premixed Diesel Compressed Ignition Combustion Engine Applied with the Split Injection Method (2단 분사방식을 적용한 부분 예혼합 디젤압축착화연소엔진의 성능에 미치는 압축비 및 EGR의 영향)

  • Chung, Jae-Woo;Kang, Jung-Ho;Lee, Sung-Man;Kang, Woo;Kim, Byoung-Soo
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.14 no.5
    • /
    • pp.32-38
    • /
    • 2006
  • Currently, due to the serious world-wide air pollution by substances emitted from vehicles, emission control is enforced more firmly and it is expected that the regulation requirements for emission will become more severe. A new concept combustion technology that can reduce the NOx and PM in relation to combustion is urgently required. Due to such social requirement, technologically advanced countries are making efforts to develop an environment-friendly vehicle engine at the nation-wide level in order to respond to the reinforced emission control. As a core combustion technology among new combustion technologies for the next generation engine, the homogenous charge compression ignition(HCCI) is expanding its application range by adopting multiple combustion mode, catalyst, direct fuel injection and partially premixed combustion. This study used a 2-staged injection method in order to apply the HCCI combustion method without significantly altering engine specifications in the aspect of multiple combustion mode and practicality by referring to the results of studies on the HCCI engine. In addition, this study confirmed the possibility of securing optimum fuel economy emission reduction in the IMEP 8bar range(which could not be achieved with existing partially premixed combustion) through forced charging, exhaust gas recirculation(EGR), compression ratio change and application of DOC catalyst.

A Study on Exhaust Gas Recirculation of Homogeneous Charge Compression Ignition Engine (균질혼합압축점화기관의 배기가스재순환 특성에 관한 연구)

  • Han, Sung-Bin;Kim, Sung-Mo
    • Journal of Energy Engineering
    • /
    • v.18 no.3
    • /
    • pp.163-168
    • /
    • 2009
  • This paper describes the homogeneous charge compression ignition (HCCI) engine for a new concept. HCCI engines are being considered as a future alternative for diesel and gasoline engines. HCCI engines have the potential for high indicated thermal efficiency under part load and very low NOx emissions. The objective of this paper is to clear the effects of exhaust gas recirculation (EGR) rate on the HCCI. For this purpose, a 4-cylinder, compression ignition engine was converted into a HCCI engine This work has been run with propane and butane fuels at a constant speed.

Start of Combustion Detection Method for Gasoline Homogeneous Charge Compression Ignition Engine (가솔린 균일 예혼합 압축착화 엔진의 착화시점 검출)

  • Choe, Doo-Won;Lee, Min-Kwang;SunWoo, Myoung-Ho
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.16 no.4
    • /
    • pp.151-158
    • /
    • 2008
  • Gasoline Homogeneous Charge Compression Ignition (HCCI) combustion is a new combustion concept. Unlike the conventional internal combustion engine, the premixed fuel mixture with high residual gas rate is auto-ignited and burned without flame propagation. There are several operating factors which affect HCCI combustion such as start of combustion (SOC), residual gas fraction, engine rpm, etc. Among these factors SOC is a critical factor in the combustion because it affects exhaust gas emissions, engine power, fuel economy and combustion characteristics. Therefore SOC of gasoline HCCI should be controlled precisely, and SOC detection should be preceded SOC control. This paper presents a control oriented SOC detection method using 50 percent normalized difference pressure. Normalized difference pressure is defined as the normalized value of difference pressure and difference pressure is difference between the in-cylinder firing pressure and the motoring pressure. These methods were verified through the HCCI combustion experiments. The SOC detection method using difference pressure provides a fast and precise SOC detection.

A Study on the Mixture Formation Process and Combustion Characteristics According to Injection Timing in Premixed Charge Compression Ignition (예혼합 압축착화 디젤엔진의 분사시기 변화에 따른 혼합기 형성 과정 및 연소 특성에 관한 연구)

  • Cho, Byung-Ho;Han, Yong-Tak;Lee, Ki-Hyung;Lee, Chang-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.26 no.12
    • /
    • pp.1692-1698
    • /
    • 2002
  • A diesel engine has various merits such as high thermal-efficiency, superior fuel consumption and durability. Therefore the number of diesel engine in the world is increasing. As the seriousness of environmental pollution increases in the world, the method to reduce the noxious materials of $CO_2$, NOx and P.M. is very important subject to correspond to exhaust gas regulations. A new concept, so called premixed charge diesel combustion(PCCI), is focused among the various corresponding manners. In this study, we investigated the mixture formation within the cylinder with injection timing using GTT simulation code and also compared combustion characteristics of PCCI engine with that of commercial diesel engine. From this experiments, it could be found that homogeneous mixture formation was observed according to advance of injection timing and simultaneous reduction of NOx and Soot in injection timing of BTDC 60$^{\circ}$.

Localization of Jet Engine Position from HRRP-JEM Images of Aircraft Targets Using Eccentricity of Complex-Valued Signals (항공기 표적의 HRRP-JEM 영상에서 복소 신호의 이심률을 이용한 제트 엔진 위치 추정)

  • Park, Ji-Hoon;Yang, Woo-Yong;Bae, Jun-Woo;Kang, Seong-Cheol;Myung, Noh-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.24 no.12
    • /
    • pp.1173-1180
    • /
    • 2013
  • High Resolution Range Profile-Jet Engine Modulation imagery first introduced in 2005 carries out radar target recognition by localizing the position of the jet engine installed on the aircraft target. This paper presents a new approach for estimating the jet engine position in the HRRP-JEM image based on the eccentricity of a complex signal. It can effectively evaluate the contribution of the JEM component to the radar received signal in a range bin of the HRRP-JEM image. Therefore, the localization is expected to be performed more quantitatively and reliably by pinpointing the range bin corresponding to the jet engine position where the JEM contribution is maximized. The simulation results of realistic aircraft models validated the effectiveness of the proposed concept.

Implementation of Active Sound Enrichment Control for Improving Engine Sound Quality Inside the Cabin of a Passenger Car (차량 실내공간의 가속 시 엔진음 음질 향상을 위한 실시간 능동음향증강 제어 구현)

  • Lee, Young-Sup;Kim, Jeakwan;Ryu, Seokhoon;Kim, Seonghyeon;Park, Dong Chul
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.26 no.2
    • /
    • pp.195-202
    • /
    • 2016
  • In this study, a concept of active sound enrichment (ASE) control system was implemented and demonstrated for improving engine sound quality inside the cabin of a passenger car during acceleration. Unlike the active noise control cancels the noise for disturbance rejection, the ASE adds additional sound to the noise for tracking control. This approach requires a new algorithm to provide additional artificial sound to the original engine sound using active control strategy to achieve a target sound profile, which is predefined to satisfy required interior sound quality. The ASE algorithm was implemented in a digital controller dSPACE DS1401 and real-time control experiment was accomplished in an actual car. The ASE control results show that the actively enriched sound of each engine order against RPM tracks the target profiles precisely and quickly and improves the discontinuity, the level ratios and the sound pressure level of each engine order. Thus it is anticipated the ASE system can be applied for the improvement of the engine sound quality inside the cabin during acceleration.