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야지 차량용 No Spin Differential 개발에 관한 연구
편영식(Youngshik Pyoun),장영도(Youngdo Jang),이영춘(Youngchun Lee),박정현(Jeonghyeon Park),여진욱(Jinwook Yeo) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.6
NSD(No Spin Dfferential) has been developed for a military truck. A benchmarking study for USA and Russian NSD has been carried out. Axiomatic approach has been applied for improving the design. A test code for NSD has been developed and applied to the developed sample. In the test results of comparing the developed sample with the USA imported sample, three major characteristics- the noise, mobility and steerability - are in the range of the intended target. A practical process for the evolution design is proposed.<br/>
야지 차량용 No Spin Differential의 평가방안 개발 및 시험평가에 관한 연구
편영식(Youngshik Pyoun),장영도(Youngdo Jang),박정현(Jeonghyeon Park),조인호(Inho Cho),이영춘(Youngchun Lee) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.4
Two No Spin Differential(NSD) models were benchmarked for a project of Dual-Use Technology. The Axiomatic approach was utilized to evaluate two models and to derive an evolutionary design from the evaluated results. Test methodology is developed and used to evaluate the mobility, steerability, durability and noise of the newly developed sample. The test results of NSD sample on the test methodology are very positive regarding functional performances.
조인식(Insik Cho),이창순(Changsoon Lee),편영식(Youngshik Pyoun),박인규(Ingyu Park),김병훈(Byounghoon Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
An ultrasonic fatigue testing device, capable of fracturing the tested materials at an ultrasonic frequency of 20 ㎑ is demonstrated. Such a testing device, operating at high frequencies, not only reduces the testing time to far less than that of conventional testing machines, but may also better simulate extremely high-frequency loading and the strong influence of strain rate on the fatigue behavior of the tested materials. This makes the development of an ultrasonic fatigue testing device for testing materials is an important endeavor. Very high cycle fatigue of Al 6061-T6 alloy was investigated using accelerated ultrasonic fatigue testing at 20 ㎑ under completely reserved loading conditions (R=-1) on a piezoelectric machine which was developed by DaeJin Science Co., Ltd. In this study, the ultrasonic fatigue tests were conducted in the range of 10?~10? fatigue fracture cycles, while testing maximum amplitude stress (S) was 117.76 ㎫ at gigacycle. Scanning electron microscopy (SEM) analyses were carried out and the results show that three crack fracture modes were observed.