• Title/Summary/Keyword: Intermediate shaft

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Bearing and Rotordynamic Performance Analysis of a 250 kW Reduction Gear System (250 kW급 초임계 CO2 발전용 감속기의 유체 윤활 베어링 및 회전체 동역학 특성 해석)

  • Lee, Donghyun;Kim, Byungok
    • Tribology and Lubricants
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    • v.32 no.4
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    • pp.107-112
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    • 2016
  • This paper presents a rotordynamic analysis of the reduction gear system applied to the 250 kW super critical CO2 cycle. The reduction gear system consists of an input shaft, intermediate shaft, and output shaft. Because of the high rotating speed of the input shaft, we install tilting pad bearings, rolloer bearings support the intermediate and output shafts. To predict the tilting pad bearing performance, we calculate the applied loads to the tilting pad bearings by considering the reaction forces from the gear. In the rotordynamic analysis, gear mesh stiffness results in a coupling effect between the lateral and torsional vibrations. The predicted Campbell diagram shows that there is not a critical speed lower than the rated speed of 30,000 rpm of the input shaft. The predicted modes on the critical speeds are the combined bending modes of the intermediate and output shaft, and the lateral vibrations dominate when compared to the torsional vibrations. The damped natural frequency does not strongly depend on the rotating speeds, owing to the relatively low rotating speed of the intermediate and output shaft and constant stiffness of the roller bearing. In addition, the logarithmic decrements of all the modes are positive; therefore all modes are stable.

Numerical Study on Evaluation of Design Parameters of Intermediate Shaft in Steering System (조향장치용 인텀 샤프트 설계변수 평가를 위한 수치적 연구)

  • Kang, Young Su;Doo, Min Soo;Kim, Jeong;Kang, Beom Soo;Song, Woo Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.12
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    • pp.1351-1359
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    • 2012
  • Due to the development of electric and hybrid vehicles, the trend has changed from hydraulic power steering system to electric power steering system (EPS). In this paper, design parameters are deduced through the structural analysis based on the finite element analysis for the intermediate shaft of the EPS on the market. By analyzing the design parameters, the structure design is improved to support the required high torque on the EPS. The numerical analysis is performed to obtain the improved design of the intermediate shaft model and the analysis results are compared with the existing model. It is noted through this numerical approach that the improved design of the intermediate shaft can be acquired the structural safety and high stiffness than existing model.

Reliability life evaluation of gear driving system for the intermediate shaft (중간축을 고려한 기어구동장치의 신뢰수명 평가)

  • 김하수
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.4
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    • pp.147-153
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    • 2000
  • This paper presents a design method using CAE(Computer Aided Engineering ) with the consideration of reliability for optimal gear driving system. This method considered a configuration of the intermediate shaft. There are four mounting types, such as double straddle, double overhung, output gear overhung, and input ger overhung in the intermediate shaft. The reliability and life analysis are based on the two-parameter Weigbull distribution lives of the gears and bearing . The validity and feasibility of the proposed method are verified by the application to transmission of a industry machine.

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Optimization of Process Variables of Shape Drawing for Steering Spline Shaft (조향장치용 스플라인 샤프트 이형인발 공정변수 최적화)

  • Lee, S.K.;Kim, S.M.;Lee, S.B.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.19 no.2
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    • pp.132-137
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    • 2010
  • In the multi-pass shape drawing process, the appropriate process design is very important to produce sound products. The reduction ratio, die angle, and the intermediate die shape are very important process variable of the multi-pass shape drawing. The aim of this study is the determination of the reduction ratio, die angle, and the intermediate die shape of the 2 pass shape drawing process for producing steering spline shaft. In this study, FE analysis, Taguchi method, and ANN(artificial neural network) were applied to determine the appropriate reduction ratio, die angle, and intermediate die shape. After the determination of the process variables, FE analysis and drawing experiment were performed to evaluate the effectiveness of the determined process variables. The dimensional accuracy of the final drawn spline shaft was evaluated by using 3D surface profiler and 3D laser digitizing system.

Design and Analysis of Intermediate Shaft of the Steering System using Vehicle Dynamics Program CADyna (차량동역학 프로그램 CADyna를 이용한 초향장치 중간축 설계 및 해석)

  • 김승오;유완석;김정배
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.3
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    • pp.185-191
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    • 2002
  • A window-based multibody dynamics program CADyna(Computer Aided Dynamics) is developed and applied for kinematic and dynamic analysis ova steering system. The program is composed oft pre-processor, a main processor, and a post-processor. The pre-processor is developed with Visual C7+ and the post-processor is developed with OpenGL and TeeChart. The main processor generates the equations of motion employing velocity transformation technique. The developed program is customized for the design of an intermediate shaft in a steering system.

Forging Process Analysis of the Multi-forging Die for the Unified Universal Pipe Joint of the Intermediate Shaft (인텀샤프트 일체형 유니버셜 파이프 조인트용 다단조금형의 단조공정해석)

  • Kwon, Hyuk-Hong;Moon, Kwan-Jin;Song, Seung-Eun
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.19 no.1
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    • pp.33-41
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    • 2010
  • This study was aimed at the design of the dies for the unified pipe joint of the intermediate shaft using the computer simulation to shorten the period of production, on the basis of the process planning which was designed by the field experts. In the computer simulation, 'Deform-3d' and 'eesy-DieOpt' have been used, which are the commercial process analysis and die design program. Through the process analysis, we could know the propriety of the forming process, the inner pressure of the die and the suitable fitting pressure between the insert and the sleeve which was not showing any positive tangential stresses in the insert. Through the simulation of die design, we could know the number of the stress ring, the diameter ratios, the stresses of the die, the shrink fitting tolerance and temperature in the condition of the already determined maximum outer die diameter of the multi-stage former. The validity of the die design using the computer simulation was analyzed by the experiments and the results were satisfactory. As the results of this study, the new and easy die design system for multi-forging has been developed.

Applicability Evaluation of IGM시s Theory Using the Results of Load Transfer Tests of Drilled Shafts (현장타설말뚝의 하중전이시험 결과를 이용한 IGM 이론의 적용성 평가)

  • 천병식;김원철;서덕동;윤우현
    • Journal of the Korean Geotechnical Society
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    • v.20 no.6
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    • pp.29-40
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    • 2004
  • The bearing capacity of drilled shaft is affected by several factors, such as shaft length, shape, surface roughness, young's modulus of geomaterials and shaft, soil strength, confining stress and so on. However, there has been no design method of drilled shaft considering all factors mentioned above. Moreover, since geomaterials are simply classified as sand, clay and rock, there was no design criterion for IGM (Intermediate Geomaterials). Therefore, the rigorous design approach of drilled shaft was not possible by classical design method. However, since these characteristics were not considered in classical theories, bearing capacity was generally different ken practical value. In this study, the bearing capacity of drilled shaft with the IGM's theory was compared with those of classical theories. The results showed that classical method showed smaller values of bearing capacity than those of field load transfer data. Moreover, the evaluated value of bearing capacity with IGM theory corresponded fairly well with those of field data.

A case study on the optimal shafting alignment concerning bearing stiffness for 10,100 TEU container carrier (베어링 강성을 고려한 10,100 TEU 컨테이너 운반선의 최적 추진축계 배치에 관한 사례 연구)

  • Lee, Jae-Ung
    • Journal of Advanced Marine Engineering and Technology
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    • v.40 no.3
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    • pp.185-190
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    • 2016
  • Damages of the main engine aftmost bearing and the after stern tube bearing tend to increase due to misalignment. And as the shafting system becomes stiffer due to the large engine power, whereas the hull structure becomes more flexible due to optimization by using high tensile thin steel plates. And this is the reason that more sophisticated shaft alignments are required. In this study, the optimum shafting alignment calculation was carried out, considering the thermal expansion effect, exploiting the sensitivity index, which indicates the reasonable position of forward intermediate shaft bearing for shaft alignment. and as the main subject in this study, the elastic deformation on intermediate shaft and main engine bearings occurred by vertical load of shaft mass were examined thoroughly and analyzed allowable load of bearings, reaction influence numbers of all bearings. As the result, a reliable optimum shafting alignment was derived theoretically. To verify these results, they were referred to the engine maker's technical information of main engine installation and being used shafting alignment programs of both Korean Register of Shipping and Det Norske Veritas, their reliability were reviewed.

Pressure Distribution Analysis for After Bush Bearing of Ship Propulsion Shaft (선박 추진축 선미 베어링 압력 분포 해석)

  • 신상훈;최익흥
    • Journal of the Society of Naval Architects of Korea
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    • v.41 no.3
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    • pp.35-40
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    • 2004
  • Since the scale of vessels is growing up recently, some troubles between the shaft and after bush bearing are frequently reported. Generally, mean pressure on bush bearing is used as a design criterion. However, in some case of the long bearing such as after bush bearing of the propulsion shaft, it might be liable to be locally under high pressure. As for the main engine bearings and the intermediate shaft bearing, it is reasonable to take the mean pressure as a design criterion. But, in case of after bush bearing, it is not sufficient because of the possibility of high pressure caused by local contact. In this study, Hertzian contact condition was applied to evaluation of the local pressure for after bush bearing. To reduce the local maximum pressure, the height of the after bush bearing was controlled. It was found that local maximum pressure could be reduced effectively by taking a partial slope on the white metal of the aft bush bearing.

Improvement of Tubular Shaft Yoke Spline Machining in Both Side IMS Module (양형 IMS 모듈 튜블러 샤프트의 스플라인 가공 개선)

  • Min, Se Hun;Suh, Hyun Kyu
    • Journal of the Korean Society of Mechanical Technology
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    • v.20 no.6
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    • pp.924-928
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    • 2018
  • 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.