• 한국소음진동공학회논문집
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• 제21권10호
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• pp.875-882
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• 2011

In this paper, the finite element analysis model of the mult-axial wheel durability test configuration is created using SAMCEF. Mooney-Rivlin 2nd model is applied to the tire model, and the variation of the air pressure inside the tire is considered. Vertical load, lateral load and camber angle are applied to the simulation model. The tire rotates because of the friction contact with a drum, and reaches its maximum speed of 60 km/h. The dynamics stress results of the simulation and experiment are compared, and the reliability of the simulation model is verified.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2010년도 추계학술대회 논문집
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• pp.346-347
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• 2010

• 한국자동차공학회논문집
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• 제2권1호
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• pp.128-141
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• 1994

This roport explain the basic theory of desinging the accelerating durability test road and the role of each factors contributing to test road surface profile. Also this road is designed by considering the charactors of vehicle suspension system and condition of driving. In test road, the factors affecting to the vehicle Structural durability are correlation among surface shape of road profile, frequency of vehicle suspension system, distribution of axletwist angle and vibration profile height Road PSD magnitude and frequency delay is used to control these factors relation.

• 동력기계공학회지
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• 제1권1호
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• pp.98-105
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• 1997

In general, crankshafts which are used in internal combustion reciprocating engines are subjects to high torsional vibration. Therefore, a damper is often used to minimize the torsional vibration in reciprocating engines. In this paper, in order to investigate damping performance of viscous damper, the real effective viscosity and complex damping coefficient of silicone oil, and the effective inertia moment of inertia ring are calculated considering the relative motion between damper casing and inertia ring. Based on these results multi-cylinder shaft is modeled into equivalent 2-degree of freedom system and optimum condition is estimated by calculating the amplification factor of viscous damper. Also the test damper was manufactured according to the result of theoretical investigation, the performance and durability was ascertained through experimental examination.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2011년도 춘계학술대회 논문집
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• pp.375-376
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• 2011

• Corrosion Science and Technology
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• 제18권4호
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• pp.117-120
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• 2019

Considering the tendency of development of electrification vehicles, development and verification of new evaluation technology is needed because of new technology applications. Recently, as the battery package is set outdoors of an electric vehicle, such vehicles are exposed to corrosive environments. Among major components connected to the battery package, rust prevention of high-voltage cables and connectors is considered the most important issue. For example, if corrosion of high voltage cable connectors occurs, the corrosion durability assessment of using an electric vehicle will be different from general environmental corrosion phenomena. The purpose of this study is to investigate the corrosion mechanism of high voltage cable connectors of an electric vehicle under various driving environments (road surface vibration, corrosion environment, current conduction by stray current, etc.) and develop an optimal rust prevention solution. To improve our parts test method, we have proposed a realistic test method to reproduce actual electric vehicle corrosion issues based on the principle test.

• Design & Manufacturing
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• 제12권3호
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• pp.48-54
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• 2018

This paper presents a numerical study for the development of a low-noise low-vibration industrial wheel for non-pneumatic wheel to significantly reduce vibration and noise. For this, design, injection molding and performance testing were performed. Various geometric shapes and materials were taken into account. For numerical analysis, ANSYS, LS-Dyna, and ABAQUS were used to predict the behavior of the wheel under different loadings based on various design changes. Based on this, 4 prototypes were fabricated by changing the design of wheels and molds, and various vibration and noise tests were carried out. A vibration tester was developed and tested to perform the vibration noise test considering durability. A prototype and test of the final wheel was performed. In the case of the vibration test, the vibration levels were 81.16dB and 80.66dB, which were below the target 90dB. Noise levels were 53.20 dB and 52.55 dB below the target 65dB. In the case of the impact resistance test, it was confirmed that there was no change in appearance after impact. The product weight was measured to be 174g compared to the target of 190g.

• 한국자동차공학회논문집
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• 제9권2호
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• pp.143-151
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• 2001

In the recent day, fatigue life prediction techniques play a major role in the design of components in the ground vehicle industry. Full scale durability testing in the laboratory is an essential of any fatigue life evaluation of components or structure of the automotive vehicle. Component testing is particularly important in todey's highly competitive industries where the design to reduce weight and production costs must be balanced with the necessity to avoid expensive service failure. Generally, Multi-axis durability testing device is used to carry out the fatigue test. In this paper, The operation software for simultaneously driving Multi-axis vibration testing device is developed and the input and output data are displayed in windows of PC controller with real time. Moteover the characteristics of the displacement and the load of Multi-axis actuators are calibrated separately.

• 대한기계학회논문집A
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• 제34권10호
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• pp.1339-1344
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• 2010

모달중첩법은 구조물의 진동특성을 고려하여 내구수명을 평가할 수 있는 내구해석 기법이다. 본 논문에서는 모달중첩법과 유사하면서도 다물체 동역학 해석시 모달좌표를 직접 계산하여 전체적인 해석시간을 줄일 수 있는 모달응력 회복법을 이용한 내구해석 기법의 타당성에 대하여 검토하였다. 이를 위해 자동차 부품 중 대표적으로 동특성을 고려해야 하는 토션빔 액슬에 대하여 모달응력 회복법을 이용한 내구해석 및 시험을 실시하였다. 해석결과는 시험결과와 취약위치, 내구수명 등이 양호한 일치 결과를 나타내었다. 따라서 모달응력 회복법을 이용한 내구해석 기법은 다양한 구조물의 동특성을 반영한 내구수명 평가에 적용될 수 있을 것이다.

• 대한기계학회논문집A
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• 제38권1호
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• pp.45-50
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• 2014

인쇄회로기판 위에 9개의 PBGA (Plastic Ball Grid Array) 패키지를 SnPb 솔더로 실장하여 진동시편을 제작하고 랜덤진동시험을 수행하였다. 진동에 대한 각 패키지 솔더의 내구수명을 분석한 결과, 패키지의 인쇄회로기판 배치 위치에 따라 솔더의 내구수명이 결정됨을 보였다. 이 위치에 따른 내구수명 의존성을 규명하기 위하여 유한요소모델을 작성하고, 모델의 모든 요소에 대해서 응력응답함수로부터 정의되는 등가응력을 분석하였다. 분석결과로부터 랜덤진동시험에서 패키지를 연결하는 솔더 중 코너에 위치한 솔더에서 최대 등가응력이 발생함을 보였다. 마지막으로, 각 패키지별 코너 솔더의 최대 등가응력값을 파괴등가응력으로 정의하고 파괴등가응력과 각 패키지의 내구수명간에 직접적인 연관관계가 있음을 제시하였다.