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박성민(Seongmin Park),권효준(Hyojun Kwon),임형진(HyoungJin Lim),권상욱(Sangwook Kwon),유영상(Youngsang Yoo),손정민(Jeongmin Son),윤지용(Jiyong Yoon) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
One of the trend that does not changed in automobile industry is improving manufacturability, reducing weight and cost savings. For that purpose, glass fiber reinforced polyamide has replaced metal as the material of choice for intake manifold in many vehicle brands. currently, PA66+GF35 and PA6+GF30 has being applied globally in intake manifold. gasoline engine of Hyundai motor company also, PA6+GF30~35 is being applied. Since Plastic material applied to intake manifold, it brought smoother surfaces, higher design freedom and lower unit cost. Since 2012, Hyundai Motor Company have been developing PP Plastic that could reduce weight and cost, while maintaining PA material property. Especially, this PP Plastic will be applied to Kappa 1.4 MPI intake manifold that is being developed by Kefico since 2015. Because PA Plastic has been used to manufacture the Intake Manifold, there are many guidelines for design and analysis(CAE). but, There are no guidelines for PP plastic because PP plastic does not used as a material of the Intake Manifold. Through this paper, We Suggest Intake Manifold design guidelines for PP plastic.
NVH 시뮬레이터 기반 흡기 소음 시뮬레이션에 관한 연구
한규빈,국형석 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.3
Noise, vibration, and harshness (NVH) simulators enable the subjective evaluation of vehicle interior noise and improvement of the NVH performance. To achieve a powerful and sporty engine sound, several original equipment manufacturers of automobile parts introduce the engine intake noise into the vehicle cabin through pipe systems that reinforce the low-frequency engine noise components. The present study proposes an intake-noise module that simulates an intake-noise reinforcing system and can be integrated with the previously developed NVH simulator. The intake-noise simulation module is based on the intake noise source model, pipe system model, and room impulse response model. The pipe system is modeled by the transfer-matrix method (TMM), and the room impulse response is modeled using the image-source method. The intake noise source is time variant because the noise source depends on the rotational speed of the engine and the crankshaft angle. TMM is also time variant because the noise propagation characteristics in TMM vary with the throttle valve angle. Intake noise source and TMM are designed in the frequency domain. In two cases of intake-noise reinforcing system, the loudness and sharpness (which are known to be correlated with a sporty engine noise) are calculated for the simulated data. The developed NVH simulator can assist the design of intake-noise reinforcing systems that reach the targeted sound quality.
김정석(Jeongseok Kim),지선호(Sunho Ji),박정률(Jungryul Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper presents the modeling of a variable intake manifold (VIM) based on a linear parameter-varying (LPV) model approach which takes into account model parameter variation with the operation point. The rate of change of volume and the actuator dynamics of the VIM are first added, and then reformulated in an LPV form. The selection of scheduling variables and the parameter dependence of the LPV model are also discussed. This approach generates the LPV model critical for air charge estimation design which helps to reduce the calibration effort. The effectiveness of the proposed approach is assessed by numerical simulation results.
가변 흡기매니폴드용 플라스틱 부품의 피로강도에 관한 연구
나찬가람(Chankaram Na),김형욱(Hyungwook Kim),김민기(Minki Kim),박정주(Jeongjoo Park),김민섭(Minseop Kim) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
Even though the era of electric vehicle has come, the needs for more economical and eco- friendly internal combustion engine have been higher. Various kinds of powertrain technologies have been applied to enhance the engine performance. Among the technologies, intake manifold is one of the key parts to influence the engine performance. This study will mainly review the development process and the result of intake manifold part focused on fatigue of the plastic part. CAE simulation and experiments were implemented to evaluate design validity. Fatigue strength of the plastic part, as well as conventional structural strength, should be taken into consideration when it comes to designing a part under repeated loads.
홍순성(Soonseong Hong),이진호(Jinho Lee),민선기(Sunki Min),김숭기(Soongkee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
DFSS (Design for Six Sigma) is a very useful method to optimize product design in various fields of the industry. This paper presents the implementation of the DFSS method to optimize an engine intake manifold with PDA system. The focus of optimization is to maximize the swirl strength and mass flow rate in the cylinder chamber. There are so many factors that affect the swirl strength and mass flow rate in intake manifold system, but only six main control factors such as plenum shape, primary and secondary length, port diameter, primary pipe section shape, etc. are adopted. The L18 orthogonal table is used for calculating CFD simulation to evaluate the swirl number and mass flow rate in the cylinder chamber.
김지선(JiSun Kim),김영진(YoungJin Kim),서창우(ChangWoo Seo),박태욱(TaeWook Park) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
In the development of engines, each manufacturer has research and performance enhancement as a top priority and make continuous efforts to maximize efficiency. For advanced performance and fuel efficiency of the engine, CFD Analysis are done in AFMS developments. As a result of this study, cylinder distribution characteristics according to the shape of various AFMS and experimental-analytical flow distribution characteristics in steady-state flow were compared and evaluated by flow distribution experiments and 3D CFD Flow Analysis of Kefico’s AFMS in production