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오정택(Jeongtaek Oh),위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For more precise analysis of vehicle fuel consumption during experimental driving mode, the measurement of energy loss(pumping friction, mechanical friction, alternator friction and etc.) is performed by pre-experiment. On diesel vehicle, mechanical friction is increased according to engine speed and load increasing. Thus the measurement of mechanical friction on diesel engine usually has performed by engine rig test using a dynamometer. However, for diesel vehicle which is going to be performed driving mode experiment, engine dynamometer test spends much time and effort, because it needs a separate operation from vehicle. In this paper, for more convenient way, chassis dynamometer test is attempted for measuring of mechanical friction for diesel engine on vehicle condition and verified with results of engine dynamometer test and NEDC mode test. Via the chassis dynamometer test, less time and effort can be spent than engine dynamometer.
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이명성(Myungsung Lee),강성원(Seongwon Kang),허남건(Nahmkeon Hur),박정택(Jeongtaek Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The flow noise of a cross-flow fan in an air conditioner indoor unit is investigated by a 2-D CFD simulation and acoustic analogy analysis. Transient flow field is obtained by solving the unsteady Reynolds-Averaged Navier-Stokes equation with the arbitrary sliding interface method to slide the grid for the relative motion of the rotating cross-flow fan. To predict the flow noise generated due to the cross-flow fan, an acoustic analogy analysis is performed with Ffowcs-Williams Hawkings model. The results show the details of transient flow field inside the air-conditioner including the typical eccentric vortex, which is appeared in the vicinity of the stabilizer. The strong interaction between the eccentric vortex and stabilizer is also well predicted, which is well known as the primary factor of the flow noise of the cross-flow fan. In order to validate the present analysis, the numerical result is compared with available experimental data such as the overall sound pressure level.