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TRIZ Application in Development of Limited Slip Differential
Y. S. Pyoun,J. H. Park,A. Gafurov,H. Kim,H. T. Kim,Y. C. Lee 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Differential is one of the heart system of a vehicle with a complicated job to perform. It passed a long way of improvement to be perfect solutions to increase the vehicle performance. In spite of all these achieved success it still remains actual to build up a better design to make it simpler yet reliable, efficient and powerful. In this point of view a new cone type Limited slip differential (LSD) is developed for Sport Utility Vehicles (SUV) and Recreational vehicles (RV) by TIC Jinheung with the support of Korean Ministry for Commerce, Industry and Energy. The evolutionary design process is carried out by utilizing Axiomatic Design (AD). In this paper the LSD development process is explained by integration of another powerful design tool such as TRIZ. The technical contradictions are defined by utilizing the TRIZ pattern of problem solving, 39 engineering parameters and 40 inventive principles are used to find a solution to the problem.
편영식,H. T. KIM,A. GAFUROV,H. KIM,D. H. JUNG,Y. C. LEE 한국자동차공학회 2008 International journal of automotive technology Vol.9 No.1
Surface topology, cone angle and the forces acting on the cone of the clutch type limited slip differential (LSD) are major design parameters for the bias ratio and the noise condition. Therefore much research has been dedicated to these developments but the results have been used to submit patents. A new cone type limited slip differential for sport utility vehicles and recreational vehicles, which has a very simple structure and easy compliance with the vehicle performance, has been developed by the axiomatic approach and the ultrasonic nano crystal surface modification (UNSM) technology. The design criteria and optimal value of the design parameters are determined by the axiomatic approach utilizing CAE tools. Test methodologies in a test rig and in a vehicle were also developed. Test results showed good performance of bias ratio and noise level but durability is still under testing. This study is an extension of F2006P266, FISITA 2006.
Economical Remanufacturing Parameter Optimization for Drive Shaft
D. H. Jung,A. Gafurov,Y. K. Seo 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Quality assessment process is based on a standard procedure. These standards are developed as a combined effort. It requires deep knowledge about structural material in addition to component`s behavior under external loads. Remanufactured components pose another difficulty to assess their quality in the form of unknown usage rate. This paper represents optimization of quality assessment criteria for remanufactured CVjoints. Working surface hardness of the CV-joint elements is measured at certain depth interval. A minimum acceptable surface hardness value for the BJ-outer joint elements is suggested based on existing research. Remanufactured CV-joint Housing, Inner race and Cage surface machining steps are studied and machining parameter optimization is performed through laboratory based durability test results. The test results of optimized machining parameters are compared with the test results of unmachined test samples. Mean-timeto-failure is calculated along with Weibull distribution parameters. Also, Birfield joint inner race bending and rotating torque are measured and standard parameters for remanufactured CV-joint are determined. Those quality assessment criteria for remanufactured CV-joints are developed.
CV-JOINT REMANUFACTURING PARAMETER OPTIMIZATION
Y. K. SEO,유상석,A. GAFUROV 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.4
Quality assessment process is based on a standard procedure. These standards are developed as a combinedeffort. It requires deep knowledge about structural material in addition to component`s behavior under external loads. Remanufactured components pose another difficulty to assess their quality in the form of unknown usage rate. This paperrepresents optimization of quality assessment criteria for remanufactured CV-joints. Working surface hardness of the CV-jointelements is measured at certain depth interval. A minimum acceptable surface hardness value for the BJ-outer joint elementsis suggested based on existing research. Remanufactured CV-joint Housing, Inner race and Cage surface machining steps arestudied and machining parameter optimization is performed through laboratory based durability test results. The test resultsof optimized machining parameters are compared with the test results of unmachined test samples. Mean-time-to-failure iscalculated along with Weibull distribution parameters. Also, Birfield joint inner race bending and rotating torque are measuredand standard parameters for remanufactured CV-joint are determined. Those quality assessment criteria for remanufacturedCV-joints are developed.
Accelerated Test Design for Crankshaft Reliability Estimation
Jung, D.H.,Pyun, Y.S.,Gafurov, A.,Chung, W.S. The Korean Reliability Society 2009 International Journal of Reliability and Applicati Vol.10 No.2
Crankshaft, the core element of the engine of a vehicle, transforms the translational motion generated by combustion to rotational motion. Its failure will cause serious damage to the engine so its reliability verification must be performed. In this study, the S-N data of the bending and torsion fatigue limits of a crankshaft are derived. To evaluate the reliability of the crankshaft, reliability verification and analysis are performed. For the purpose of further evaluation, the bending and torsion tests of the original crankshaft are carried out, and failure mode analysis is made. The appropriate number of samples, the applied load, and the test time are computed. On the basis of the test results, Weibull analysis for the shape and scale parameters of the crankshaft is estimated. Likewise, the $B_{10}$ life under 50% of the confidence level and the MTTF are exactly calculated, and the groundwork for improving the reliability of the crankshaft is laid.
Accelerated Test Design for Crankshaft Reliability Estimation
D. H. Jung,Y. S. Pyun,A. Gafurov,W. S. Chung 한국신뢰성학회 2009 International Journal of Reliability and Applicati Vol.10 No.2
Crankshaft, the core element of the engine of a vehicle, transforms the translational motion generated by combustion to rotational motion. Its failure will cause serious damage to the engine so its reliability verification must be performed. In this study, the S-N data of the bending and torsion fatigue limits of a crankshaft are derived. To evaluate the reliability of the crankshaft, reliability verification and analysis are performed. For the purpose of further evaluation, the bending and torsion tests of the original crankshaft are carried out, and failure mode analysis is made. The appropriate number of samples, the applied load, and the test time are computed. On the basis of the test results, Weibull analysis for the shape and scale parameters of the crankshaft is estimated. Likewise, the B10 life under 50% of the confidence level and the MTTF are exactly calculated, and the groundwork for improving the reliability of the crankshaft is laid.