In the case of a rear-wheel drive vehicle, a propeller shaft is installed to transmit the driving force of the engine. At this time, the propeller shaft is divided into 2 or 3 pipes, and the bearing is mounted on the vehicle body. And the end of the propeller shaft is connected to the rear differential and connected to the body through the chassis. Due to this complex structure, the propeller shaft must be highly balanced and the mounting angle must be well maintained. However, depending on the driving conditions of the car, various noise and vibration problems occur due to the aging of the parts and the propeller shaft. Hyundai Motor Company's maintenance center uses 'Noise Observer' to resolve various noise and vibration customer complaints. This paper describes the mechanism of vibration problems caused by unbalance of the propeller shaft and the diagnosis process using a 'Noise Observer'.

A spiral flow path was applied to solve the problem of the existing straight flow path in the leveling shaft, a key component of the self-levelizer that can maintain the height according to the change in payload in EV, SUV. In this study, flow analysis was performed to check the velocity, pressure drop, and flow direction of oil according to the main operating conditions of the leveling shaft with a spiral flow path. As a result of the study, a leveling shaft with a spiral flow path is likely to improve fluid properties around the orifice and inlet valve under compression conditions, and it is judged to have a development application effect.

연안 해역에서 소형 선박의 프로펠러 고장으로 인한 사고가 지속적으로 발생하고 있다. 특히, 해상부유물(폐그물 및 로프 등)에 의하여 선박 프로펠러가 감기는 사고가 빈번히 일어나고 있다. 선박 프로펠러 감김 사고는 동력 상실로 인한 선박의 운항 지연 및 표류로 인한 1차 사고와 프로펠러에 감긴 로프을 제거하기 위한 잠수 작업등으로 인한 2차 사고의 우려가 있다. 이러한 빈번한 프로펠러 감김 사 고에도 불구하고 문제를 해결할만한 적절한 도구가 없어 선박을 육상으로 인양하여 수리하거나, 잠수부가 직접 선박 아래로 잠수하여 문제를 해결하고 있는 실정이다. 이에 따라, 최근 선박 프로펠러 감김 사고를 예방하기 위해 프로펠러 샤프트에 로프절단장치를 일부 소형 선박에 장착하고 있으나 비교적 높은 설치비용 및 시간이으로 인하여 원활하게 적용되어지지 않는 것으로 판단된다. 본 연구에서는 이러한 문제점을 해결하기 위해 기계톱 원리를 이용한 간단한 구조를 가진 수중절단기 기구 설계 및 제어기 개발을 수행하였다. 수중절단 기의 톱날은 직선왕복동작을 위해 유성기어와 크랭크핀을 사용함으로써 긴 행정을 가질 수 있도록 하였다. 또한 수중절단기는 소형 선박에 비치되어있는 배터리를 이용하여 작동시킬 수 있도록 하였다. 또한, 비전문가인 사용자가 보다 편리하고 안전하게 사용할 수 있도록 역전류 방지 및 속도제어회로를 적용하여 편리성 및 안정성을 확보하였다.

The objective of this numerical study is to investigate the effect of shaft part’s diameter on the load distribution, under-fill, and metal-flow line characteristics in tubular & solid shaft yoke of Al-IMS. The outer diameter of tubular shaft yoke was changed from 30mm to 35mm, and the shaft diameter of solid shaft yoke was varied from 20mm to 25mm. In this results, the required load for production was linearly increased with increasing the tubular shaft yoke outer diameter. In the solid shaft yoke, the loads for the shaft part extending process were almost constant by 10,000kg, however, the loads for generating the yoke process, which were needed a lot of strain, were increased by 4,000kg with increasing the diameter of shaft part. The under-fill regions according to diameter of the shaft part were not observed in both products, and the metal-flow lines were also straight without folding phenomena.

There are many studies to extend the distance traveled by electric vehicles. However, much research has been done to increase the capacity of the battery. In this study, some engines for power generation, in which a battery is charged with energy by mounting a small internal combustion engine in which an engine is mounted in an electric vehicle and the battery is charged with energy, are being studied. Therefore, since such an engine is operated at a high load, the camshaft and the camshaft are emphasized to have high load strength and durability to withstand fatigue.

본 연구의 목적은 드라이버 샤프트 길이와 신체적 조건이 헤드스피드와 비거리 및 방향성에 미치는 영향에 대하여 분석하였다. 연구에 참여한 대상은 핸디캡인 0인 남자 프로골퍼 27명을 대상으로 신체적인 조건은 키(170cm≥170-175cm≥175-180cm)로 하였고, 연구에 사용한 드라이버 길이는 44 인치, 45 인치, 46 인치로 하였다. 골프 수행력은 헤드스피드와 비거리 및 방향성을 종속변인으로 설정하여 분석하였다. 연구 결과 일반적인 헤드스피드는 44, 45인치와 46인치 간에는 유의한 차이가 나타났다(p<.01). 비거리에서는 44인치와 46인치 간에 유의한 차이가 나타났다(p<.05). 방향성에서는 44, 45인치와 46인치 간에는 유의한 차이가 나타났다(p<.05). 키에 따른 헤드스피드는 170, 171-175cm에서는 클럽 간에 대동 소이하였고, 176-180cm 44인치와 46인치 간에 유의한 차이가 나타났다(p<.01). 키에 따른 비거리는 170cm에서는 클럽길이 간 대동소이하였고, 171-175cm에서는 44인치와 46인치 간에 유의한 차이가 나타 났으며(p<.01). 176-180cm 45인치와 46인치 간에 유의한 차이가 나타났다(p<.05). 키에 따른 방향성에서는 170cm에서 44인치와 45인치 간에 유의한 차이가 나타났고(p<.05), 45, 46인치에서는 키와 상관없이 클 럽 간 유의한 차이가 없는 것으로 나타났다. 결론적으로 드라이버 샤프트 길이 및 키에 따른 골프 수행력에 영향을 미치는 것으로 나타났다.

The objective of this study is to solve a problem that is occurred during the spline machining of tubular shaft yoke in both side IMS module. In order to simulate the problem, the movement direction of upper die was set as standard case and error case. The material of tubular shaft yoke was set to S20C as refer to the analysis library. The movement directions of upper die were separated with standard case and error case. The error case was set to simulate the problem in the spline machining of tubular shaft yoke. In order to solve the problem, the outer radius of upper die were modelled from 9.40mm to 9.44mm. The simulation results were analyzed and compared in terms of effective stress, metal flow line and folding phenomena characteristics. In case of the outer radius of upper die was 9.42mm, it was observed a relatively uniform effective stress distribution and had a straight metal flow line.

The objective of this study is to investigate the effect of torque variation on stress distributions in A-IMS module with both side tubular shaft yoke by numerically. In order to achieve this, the torque value was increased from 10Nm to 40Nm, and the results of this work were confirmed in terms of Von-mises Stress and the displacement characteristics. As the torque in module assembly was increased, the stress in tubular shaft york and splined shaft york was increased linearly. The indentation due to the steel ball was occurred in over 40N·m torque which is over the yield strength condition. The largest displacement occurred in the tubular shaft yoke 1, however, it does not exceed the yield strength and is supposed to be restored due to the elasticity. Therefore, it was concluded that there is no problem for the manufacturing of A-IMS with both side tubular shaft yoke.

A study has been conducted on the structural analysis to reduce the light weight of the electric vehicle rotor shaft. ANSYS Static Structural was used for structural analysis. For weight reduction, the solid shaft was converted into a hollow shaft. The yield strength of the existing material SCM 440 is 655MPa, but to increase its safety, the yield strength is changed to 1,030MPa with SCM822H. At this time, weight reduction of about 47% was achieved. The resonance frequency of the rotor shaft was determined by vibration analysis and the structural safety was analyzed.

이 연구의 목적은 골프드라이버 샤프트의 가변성이 타구속도, 헤드스피드 및 비거리에 미치는 영향을 분석하고자 하였다. 이 연구에 참여한 피검자는 핸디캡이 0인 남자 프로골퍼 10명과 핸디캡이 18인 남자 아마추어 골퍼 10명으로 하였다. 클럽의 종류는 1번 드라이버로 한정하였고, 각기 다른 스팩의 24개 드라이버를 가지고 실시하였다. 종속변인으로는 타구속도, 비거리 및 헤드스피드로 하였다. 연구 결과 다음과 같은 결과를 얻었다. 첫째, CPM에 따라 유의한 차이가 나는 것으로 밝혀졌고, 사후검증 후 230< 이상일 때 타구속도, 비거리 및 헤드스피드에서 최적의 수행력을 보였다. 둘째, 샤프트길이에 따른 타구속도 및 비거리는 유의한 차이가 나는 것으로 나타났고, 사후검증 후 타구속도 및 헤드스피드는 46inch에서 비거리는 45inch에서 최적의 수행력을 보였다. 셋째, 샤프트 무게에 따른 변인 간 차이는 나지 않았고, 사후검증 후 샤프트 무게가 65g일 때 타구속도와 비거리에서 최적의 수행력을 보였고, 50g일 때 헤드스피드에서 최적을 보였다. 또한 프로와 아마추어 간에는 변인에서 유의한 차이가 나는 것으로 나타났다. 결론적으로 최적의 드라이버는 CPM이 230<, 샤프트길이 46inch, 샤프트 무게가 65g 샤프트 일 때 최고의 수행력을 발휘하는 것으로 판명되었다.

The objective of this study is to find the optimal size of splined shaft in IMS module. Two methods were used in this study. One is for the investigation of effect of indentation process on the tubular shaft yoke, and another is for the investigation of effect of indentation process on splined shaft. The spline outer size of splined shaft was increased from 0.00mm to 0.20mm. The simulation results were analyzed and compared in terms of under-fill, metal flow, effective strain, Von-mises stress and load characteristics. The indentation load was increased with increasing of spline size. However, in case of 0.15mm outer diameter increasing, the separation load was decreased. The case of 0.10mm diameter increasing was the best spline size based on the low indentation load and high separation load.

The objective of this study is to investigate the effect of tubular shaft hole length on the A-IMS production process in numerically. The hole length of tubular shaft was changed from 69.5mm to 79.5mm for distribution of load and stress. Then, the tubular shaft was modeled by S20C which was referred to program library. At the same time, the results of numerical analysis were compared in terms of under-fill, metal flow, principal stress, Von-mises stress and load characteristics. In the results, the load and stress were increased at 4 stage when the hole length of tubular shaft was increased. Also, folding phenomenon was observed to intensify as increasing the hole length of tubular shaft by confirmation of metal flow.

The objective of this study is to solve the problem that was occurred during the spline processing in A-IMS tubular shaft. The upper dies were modelled conventional case and modified case. The tubular shafts were modelled as standard case and error case. The error case assumed production error of raw material. The material of tubular shaft was set to SCM 420H as refer to the analysis library. The simulation results were analyzed and compared in terms of metal flow, effective stress, and effective strain characteristics. The crushed and buckling problems were observed at the upper side of tubular shaft body when conventional upper die was applied. However, the crushed and buckling problems were solved when modified upper die was applied.

The object of this study is to improve the straightness in tubular shaft production. Die bearings of 1, 2 and 3 were inserted onto the lower die, respectively. In this study, the tubular shafts at the stage 5 were modelled as the standard and error cases. The error case assumes the production error of raw material. The coefficient of friction was set to the Oil_Cold conditions as referring to the analysis library. In the results, the effective stress was observed homogeneously on the distribution at yoke top in standard case. However, the effective stress was observed on the distribution at long section of yoke in case of the raw material with error. The metal flow line was stretched straight in standard case. On the other hand, the metal flow line was bent in all of error cases. The biggest displacement occurred when only one die bearing was applied. The smallest displacement occurred when two die bearings were applied in lower die.

선박엔진에서 회전을 하면서 연료 압축 흡기 배기 밸브를 일정 간격으로 여 닫는 축을 캠샤프트라 한다. 엔진 선행 조립 작업시간을 조사해 보니 켐 샤프트 조립 공정 이 공정별 표준시간 대비 소요시간이 353.4 분 으로 표준시간 156.2 분 보다 높아 시급히 개선이 요구되어 캠 샤프트 조립 시간 항목별 파레토도 분석을 통해 샤프트 조립 시간을 중점항목으로 선정하여 개선하여 개선 후 31.1 분으로 감소하였으며 연간 4800만원 원가절감을 하였다.

This study is on the structural analysis and fatigue evaluation of Re-EV engine cam shaft used to drving range extended electric vehicle. Recently, Electric vehicle is very important for driving extended. Specially this study is upgrade of cam shaft to improve durability and fatigue life.