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전기이륜차 구동모터 전비 향상 설계를 위한 Driving Cycle 대표점 선정
이찬우(Chanwoo Lee),하원필(Wonpil Ha) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In the optimization design of the traction motor, performance such as torque and power is mainly selected as an objective function. Recently, in the electric drive system, the driving mileage is a very important item due to limited batter capacity, and for this reason, it is necessary to design the traction motor in consideration of energy efficiency. However, in order to calculate the energy efficiency, it is necessary to calculate the motor losses at all operating points of the driving cycle, which requires a lot of calculation time for optimal design. In this study, in order to simplify the calculation of the energy efficiency of the motor, two methods for selecting representative points that can replace the entire driving cycle (WMTC mode) were proposed and the accuracy was verified. As the first method, the representative point selection using frequency weight at each division which was obtained division optimization was proposed, and as the second method, the K-Means clustering machine learning algorithm was proposed. In addition, 2 proposed methods were validated and the accuracy were checked with the values that were calculated by only the selected representative operating points. The research was conducted on the traction motor for EV2Wheeler and carried out through FEA (Finite Element Analysis) electromagnetic field analysis tool, optimization tool and Simulink modeling.
이경훈,김병삼,김형두 한국기계기술학회 2016 한국기계기술학회 학술대회논문집 Vol.2016 No.05
The noise from the exhaust system to the engine is important in terms of the problem of noise pollution, as well as improved marketability, there are many studies being made. Normally, the exhaust noise change is the exhaust manifold of the muffler or four days depending on the structure of the portion of the shape and the Lancer, called look a big difference, and the perforated pipe resonance, expression that contains a study of the structure of the muffler is a general precedent. This muffler is based on four wheel to differentiate between the borrower and the borrower can be broken down into a motorcycle. The details of the stock muffler, the muffler is tuned racing use. Therefore, this study is the last motorcycle noise and exhaust emission for environmental tests have not been established yet 125cc motor cycle noise is used as a reference for the criteria for information about the experiment. There are few types of motorcycle muffler, such as stock muffler, slip on muffler and full system muffler used racing. On this study through to the measurement motorcycle exhaust noise and analysis 1/3 octave band get a target frequency. For the design resonance muffler used Helemholtz’s resonance formular. Also when design the muffler consider mount of frame. This studied expect reduction noise without sound absorption.
김형두,김병삼 한국기계기술학회 2016 한국기계기술학회 학술대회논문집 Vol.2016 No.05
The tyre/road noise becomes aggravated due to the rapid increase of motor vehicles. It has a great effect on the dwelling environment. Therefore we investigate the characteristics and sources of the tyre/road noise through grasping the status of the tyre/road noise. Traffic noise results from the collective contribution of the noise produced by individual motor vehicles. The tyre/road noise varies enormously depending upon its type and mode of operation. In this study, we investigate the noise labelling of EU tire.