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모달중첩법을 이용한 ESC 어셈블리용 브라켓의 피로수명평가
이정환(Jung-Hwan Lee),김승중(Seung-Joong Kim),한민규(Min-Gyu Han),장세인(Sane Chang),정인승(In-Seung Chung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
It is well known that the ESC (electronic stability control) system plays an important role in vehicle safety. In general, the structural integrity of ESC system should be assured over 10 years. This is because the fatigue life evaluation for ESC system under service loading is required. The purpose of this study is to find an appropriate condition of structural damping coefficient for frequency response analysis and to evaluate the fatigue life of a bracket for ESC assembly by using modal superposition method. To verify the results from fatigue analysis, an experiment was conducted under the same condition as numerical simulation, and their results were compared.
ISO26262를 위한 SENT(Single Edge Nibble Transmission) 검증 기술 확보
서지원(Jiwon Seo),박동준(Dongjun Park),이한주(Hanju Lee),장세인(Sane Chang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
SENT is the newest standard for communication within vehicle-electric-system electronics. The technology allows easy and economical replacement analog transmission. It can be considered as a low-cost alternative to the LIN or CAN communication standard. However, in case SENT needs additional failure mode and standard of verification. This paper introduces the test mode to SENT signal validation Method, device setup for the test and showing test results which are applied to Mando EPS Torque Sensor.
이한주(Hanju Lee),이규훈(Kyuhoon Lee),서지원(Jiwon Seo),장세인(Sane Chang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
ACC Stop & Go is a full range adaptive cruise control system, which operates from 0㎞/h to 180㎞/h speed range. ACC Stop & Go system uses 77㎓ radar sensor to detect forward objects. Radar sensor detects the distance and the relative velocity of forward objects, and it decides target acceleration or deceleration values. The goal of this study is to develop hardware-in-loop simulator for applications of ACC Stop & Go system such as control algorithm development, fail management development and system verification and validation. The developed HIL simulator consists of a real time operating system, a sensor emulator, a test bench, and operation software. Especially this simulator needs not only a vehicle model, but a radar sensor model also. The radar sensor model enables the detection of forward objects, so that the distance and the relative velocity from forward object can be calculated in mathematical method. The test bench of simulator uses real vehicle’s driver seat and 3 dimensional graphic animation program, so it makes more realistic environment to testers. To verify this simulator’s performance, simulation results are compared with real field test results.
케이블-풀러 전자식 주차 브레이크의 작동소음 저감에 관한 연구
한민규(Mingyu Han),이재용(Jaeyong Lee),김승중(Seungjoong Kim),장세인(Sane Chang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper addresses a modification for reducing operating noise of an cable-puller EPB(Electronic Parking Brake) system. Recently, as an application of EPB system in the vehicles has been broadened, drivers’ complaint about operating noise of EPB has been larger. The root cause of operating noise of EPB is comprised of 3 main factors, the first is the initial source like motor and reduction gear set, the second is transfer characteristics like rubber bush, bracket and body, and the last is resonance characteristics between the operating frequency and the system’s natural frequency. In this study, many methods like tests and CAE analysis was carried out to reduce the initial source and transfer amount of noise and vibration, and to avoid the superposition of natural frequency. Improved sound characteristics of EPB assembly in laboratory test don’t agree with improved sound result on the vehicle test. This shows interior vehicle sound result is influenced by vibration characteristics as well as sound characteristics.
소현준(Hyunjun Soh),문신(Shin Moon),윤규원(Kyuwon Yoon),박춘기(Choonki Park),박주상(Joosang Park),장세인(Sane Chang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Squeal is generated by system instability, which is caused from friction energy to make a brake system exciting. Squeal could be predicted from instable mode, which is the result of complex eigenvalue analysis. In this study, to confirm the accuracy of the analysis process, the results of instability analysis is compared with that of dynamo test, and then, to improve the squeal noise of the brake system, the structure of carrier is alternated, which is the most affective part of 2.4㎑ system mode.