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손성만(Sungman Son),박경석(Kyoungsuk Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The temperature of exhaust gas. was raised by increasing of engine movement on developing engine. Thermal of high temperature and pressure reverse in bellows, because of increasing of engine movement and the thermal performance of converter in combustion. As a result, thermal loss is increased and thermal efficiency is decreased rapidly in bellows, it can occur to damage in mechanical structure. In this study, it was necessary to analyze back pressure performance and thermal characteristic on driving condition in exhaust system. We adapted braid type bellows and straight type exhaust pipe. It was compared with curve type exhaust pipe for lay-out on considering to design of exhaust system It was necessary to improve thermal characteristic and back pressure performance so that exhaust cavity pipe(ECP) was installed between bellows and catalyst convert. Not only decreasing back pressure was solved but also thermal characteristic problems in exhaust pipe because of increasing capacity. We analyzed that exhaust system have an effect on engine combustion performance. According to this study, the basis of data is presented when new exhaust system is designed.
정한별 ( H B Jung ),박길문 ( G M Park ),고현선 ( H S Go ),김노형 ( N H Kim ),이행남 ( H N Lee ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.1
The exhaust noise occurs when the exhaust gas generated from the automobile engine is transmitted to the air through the exhaust system and the tail pipe. This kind of exhaust noise have a great effects on the inside and outside noise of the automobile. Designing a automobile muffler make importance of muffler performance such as transmission loss but it is difficult to develop a muffler considering only a transmission loss. In this study using the GT-Power, the gasoline engine-model noise analysis program, we analyzed the exhaust sound and back pressure followed by the shape condition of inlet pipe of the muffler. Expecting the exhaust noise using this noise analysis program can cut costs and curtail the developing period of the muffler.
문승진(Seungjin Moon),서호철(Hochul Suh),박진용(Jinyong Park),박현영(Hyunyoung Park),박경석(Kyoungsuk Park) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The many varieties in exhaust pipe routing and the flexibility in muffler design make it possible to design an exhaust system to deliver tail pipe noise for customer requirements. Exhaust acoustics simulation is an important part of the exhaust system process. This paper describes an advance of the GT-POWER code to simulate the exhaust system. It simulate Tail pipe noise and back pressure level using 4cylinder gasoline engine. It accomplished the TL simulation of the main resonator included EVV(Exhaust Variable valve) for the verification against the tail pipe noise simulation model. And it was verified experiment result for propriety of the simulation model.
저속 회전 시 배기시스템의 배압이 정숙성에 미치는 영향
강일석(Il-Seok Kang),양성모(Sung-Mo Yang) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.6
In recent years, the driving performance and exhaust sound quality in automobiles have been recognized as important factors, as they maximize the driving fun to fulfil the demands of customers. Therefore, many automobile manufacturers are studying various exhaust pipe shapes to improve sound quality and optimize exhaust pressure. The objective of the exhaust pipe design is to maximize the engine efficiency using optimal exhaust pressure settings. In this study, an exhaust system was fabricated with different junction shapes, and the results were analyzed through various experiments. The exhaust gas pressure acting inside the exhaust pipe was measured using a pressure transducer. Meanwhile, the vibration generated in the vehicle was measured in three axial directions and analyzed. The ground noise generated in the indoor and outdoor of the vehicle was measured, and the noise generated at the maximum output was measured and analyzed.
이효덕(Hyo Deok Lee),최석천(Seuk Cheun Choi),이상철(Sang Chul Lee),이광영(Kwang Young Lee),정효민(Hyo Min Jeong),정한식(Han Shik Chung) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In this study, a experimental method has been introduced for the various exhaust pipe geometry of 4-stroke single cylinder engine. The main experimental parameters are the variation of exhaust pipe diameters and lengths, to measuring the pulsating flow when the intake and exhaust valves are working. As the results of experimental test, the various exhaust geometry were influenced strongly on the exhaust pressure. As the exhaust pipe diameter was decreased, the amplitude and the number of compresson wave in exhaust pressure was increased. According to decreasing pipe diameter the number of compresson wave in exhaust pressure was increase, the second amplitude was incresed.
Effect of Confluence Geometry of Dual Exhaust System on Quietness and Power
강일석,양성모 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.1
Recently, the driving performance that maximizes driving pleasure, exhaust sound quality, and quietness have been recognized as important elements according to the demands of clients. Technology has been dramatically developed while the evaluation and improvement of the exhaust system have been attempted using various methods to meet the requirements of clients, the largest problem in designing the exhaust system is to maximize performance by forming the optimal back pressure and flow velocity and to reduce the generated noise and vibration. The objective of this study is to propose an optimal geometry of an exhaust system for sports sedans with a V6 and above engine. To achieve this, an experiment was conducted as follows. Before a prototype was fabricated, an exhaust system was designed and the fluid flow was analyzed. A pressure transducer was installed in the prototype, and the exhaust pressures on the exhaust system were measured at idle, medium and high engine speeds. Noise and vibration were also measured to analyze the impact of confluence geometry on the silence of vehicle. Finally, wheel horsepower, torque from wheels were analyzed using a chassis dynamometer to identify an output difference according to confluence chamber geometry and propose an optimal geometry.
A Study on the Fluid Dynamic of Catalytic Converter in Exhaust Pipe
Wangwenhai, Wangwenhai,Cho, Haeng Muk The Korean Society for Energy 2014 에너지공학 Vol.23 No.2
The need to maximize the exhaust pipe inside surface and to minimize exhaust resistance And Find the best point between the exhaust and the duration of contact between the two surfaces. Exhaust gas mass flow On the whole cross section of catalytic converters more uniform distribution will contribute to its usability. Based on the flow rate of fluid traces given color, Exhaust fluid resistance in the porous catalyst can be estimated, from the efficiency of the catalytic converter that is very important.
함정 윙브릿지 과소음 현상에 대한 폐기관 연돌 소음의 영향성 연구
김용훈,한형석,전수홍,이가향 국방기술품질원 2023 국방품질연구논집 Vol.5 No.1
The aim of this study was to investigate the influence of diesel engine exhaust pipe system's noise on the wing bridge's loud noise phenomenon. In wing bridge, exhaust noise is considered the major noise source than wall transmitted noise. However, low frequency band noise is considered to be generated by structure's vibration, which is transmitted from diesel engine and exhaust pipe system. To mitigate such noise phenomenon, first, the allowable limit of exhaust noise (or noise limit on wing bridge area) is to be established. In addition, a silencer with enough noise attenuating performance is to be designed according to the allowable limit. Second, funnel walls and structures are to be reinforced robustly to avoid easy-to-vibrate condition. Lastly, proper vibration isolation methods are to be applied to all supporting points of the exhaust system without missing any points.