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Global-Local Finite Element Analysis for Predicting Separation in Cord-Rubber Composites of Radial Truck Tires

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Open Journal of Modelling and Simulation 2019年第4期7卷 190-202页

作者： kyoung moon jeong Kee Woon Kim Jang Hyeon Kim R&D Center Kumho Tire Co. Inc. Yongin-si Gyeonggi-do South Korea

A global-local finite element modeling technique is employed in this paper to predict the separation in steel cord-rubber composite materials of radial truck tires. The local model uses a finite element analysis in conjunction with a glob-al-local technique in ABAQUS. A 3-dimensional finite element local model calculates the maximum cyclic shear strain of an interface between steel cord and rubber materials at the carcass ply shoulder region. It is found that the maximum cyclic shear strain is reliable as a result of the analysis of carcass ply separation in radial truck tires. Using the analysis of the local model, a study of the cyclic shear strain is performed in the shoulder region and used to deter-mine the carcass ply separation. The effect of the change of carcass ply design on the separation in steel cord-rubber composite materials of radial truck tires is discussed.

关键词： Global-Local Finite Element Analysis Separation Composite Material Truck Tire

Finite Element Analysis of Tire Traction Using a Rubber-Ice Friction Model

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Open Journal of Applied Sciences 2018年第11期8卷 495-505页

作者： Hyun Chul Jung Woo Cheol Park kyoung moon jeong R&D Center Kumho Tire Co. Inc. Yongin South Korea

The friction of road surface covered by snow or ice is very low and that results in reducing vehicle traction forces and potential traffic accidents. In general, to establish a master curve on a rubber-ice friction model is difficult because the ice surface, being not far removed from its melting point, reacts itself very sen-sitively to pressure, speed, and temperature changes. In this paper, an accepta-ble frictional interaction model was implemented to finite element method to rationally examine the frictional interaction behavior on ice between the tire and the road surface. The formula of friction characteristic according to tem-perature and sliding velocity on the ice surface was applied for tire traction analysis. Numerical results were verified by comparing the outdoor test data and it was confirmed to indicate similar correlation. It is found that the rub-ber-ice friction model will be useful for the improvement of the ice traction performance of tire.

关键词： Tire Ice Surface Finite Element Method Frictional Model Temperature Slid-ing Velocity

Verification of Tire Hydroplaning Phenomenon Using Coupled FSI Simulation by CFD and FEM

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Open Journal of Applied Sciences 2020年第7期10卷 417-431页

作者： Hyun Chul Jung Mi Dum Jung kyoung moon jeong Kyunghoon Lee Design Automation & Simulation Team R & D Center KUMHO TIRE Co. Inc. Yongin-si Gyeonggi-do South Korea Solution Lab Co. 20 Dunsanjung-ro Seo-gu Daejeon South Korea

Hydroplaning phenomenon is one of the major factors that must be considered to ensure safe driving on wet road surfaces. In this paper, the approach to numerical simulation of the physical hydroplaning characteristics using patterned tire is described. A detailed 3-D patterned tire model is constructed by in-house modeling program and the water flow is considered as incompressible. The complex tire material compositions are effectively modeled using composites, and rubber properties generalize the Mooney-Rivlin model. The finite element method (FEM) and the advanced finite volume method (FVM) are used for structural and for fluid-tire interaction analysis, respectively. Performance prediction of hydroplaning via coupling of computational fluid dynamics (CFD) and FEM has delivered a detailed insight into the local mechanisms and root causes of hydroplaning. Numerical examples were verified by comparing the experimental test results and it is confirmed to indicate similar correlation tendency and high reliability. The effect of driving velocity, pattern groove size, and pattern direction on hydroplaning phenomenon of tire is discussed and logical results were obtained.

关键词： Tire Hydroplaning Finite Element Method Computational Fluid Dynamic Fluid Structure Interaction

Finite Element Analysis for Groove Wander Prediction of Passenger Car Tires with the Longitudinal Tread Grooves

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Engineering（科研） 2016年第1期8卷 11-20页

作者： kyoung moon jeong Sung Ju Kang Hyoung Seok Kim Kee Woon Kim R&D Center KUMHO TIRE Co. Inc. Yongin-si South Korea

A finite element modeling technique is employed in this paper to predict the groove wander of longitudinal tread grooved tires. In generally, groove wander is the lateral force acting on a vehicle’s wheel resulting from the combination of rain grooves. If the lateral force of tire is generated by groove wander, unexpected lateral motion of vehicle will happen and it makes drivers uncomfortable. This paper describes the effect of groove wander according to the shape condition of tire tread groove and highway groove using the finite element analysis based on a static loading or a steady-state rolling assumption. The road groove can be located anywhere relative to the longitudinal tread groove. Therefore, the lateral force of the tire is changing depending on the location of the groove road. The numerical results for groove wander prediction of the longitudinal tread grooved tires are compared with the subjective evaluation. It is found that the waveform for the tire with varying grooved road position has a peak-to-peak lateral force in order to estimate the rating of groove wander. The effect of the road groove width and the pitch length on the peak-to-peak lateral force of tire is discussed. It is found that the prediction of FEA-based groove wander model using finite element analysis will be useful for the reliability design of the tire tread pattern design.

关键词： Groove Wander Tire Finite Element Analysis Lateral Force Tread Design

Numerical Estimation of the Uneven Wear of Passenger Car Tires

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World Journal of Engineering and Technology 2018年第4期6卷 780-793页

作者： Sang Wook Lee kyoung moon jeong Kee Woon Kim Jang Hyeon Kim R&D Center Kumho Tire Co. Inc. Yongin South Korea

Tire wear is a very complicated phenomenon that is influenced by various factors such as tire material, structure, vehicle and road conditions. In order to evaluate tire wear, a method for measuring tire wear using the intensity of reflected light was presented?[1]. It comprises applying a single layer of reflected paint to a tread surface by spraying, and then measuring the intensity of light reflected from a matrix of blocks on the unworn tire. In this paper, a numerical technique for predicting the uneven wear of passenger car tire is presented. The uneven tire wear produced in wheel alignment condition with vehicle speed, camber angle, and toe angle is predicted by the frictional dynamic rolling analysis of 3D patterned tire model. The proposed numerical technique is illustrated through the method of paint testing the wear on the tread surface of a tire.

关键词： Tire Uneven Wear Finite Element Analysis Frictional Energy

The Effect of Tire Design Parameters on the Force Transmissibility

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Open Journal of Applied Sciences 2018年第10期8卷 446-458页

作者： Woo Cheol Park Hee Kyu Lim kyoung moon jeong Tan Wan Kim R&D Center KUMHO TIRE Co. Inc. Yongin South Korea

A finite element modeling technique is employed in this paper to predict the force transmissibility of tire-cavity-wheel assembly under a free-fixed condition. The tire and wheel force transmissibility is factor in structure borne road noise performance. In order to improve structure borne noise, it is required to lower the 1st peak frequency of force transmissibility. This paper presents an application of finite element analysis modeling along with experimental verification to predict the force transmissibility of tire and wheel assembly. The results of finite element analysis for force transmissibility are shown to be in good agreement with the results from the indoor test. In order to improve structure borne noise, it is required to lower the 1st peak frequency of force transmissibility. And, the effect of the tire design parameters such as the density and modulus of a rubber and the cord stiffness on the force transmissibility is discussed. It is found that the prediction of the force transmissibility model using finite element analysis will be useful for the improvement of the road noise performance of passenger car tire.

关键词： Force Transmissibility Tire-Cavity-Wheel Assembly Design Parameter Finite Element Analysis Noise

Invasive and non-invasive diagnosis of cirrhosis and portal hypertension

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World Journal of Gastroenterology 2014年第15期20卷 4300-4315页

作者： moon Young Kim Woo kyoung jeong Soon Koo Baik Department of Internal Medicine Yonsei University Wonju College of MedcineWonju Severance Christan HospitalWonju 220-701South Korea Department of Radiology and Center for Imaging Science Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 440-746South Korea

With advances in the management and treatment of advanced liver disease,including the use of antiviral therapy,a simple,one stage description for advanced fibrotic liver disease has become *** refining the diagnosis of cirrhosis to reflect disease heterogeneity is essential,current diagnostic tests have not kept pace with the progression of this new *** biopsy and hepatic venous pressure gradient measurement are the gold standards for the estimation of hepatic fibrosis and portal hypertension(PHT),respectively,and they have diagnostic and prognostic ***,they are invasive and,as such,cannot be used repeatedly in clinical *** ideal noninvasive test should be safe,easy to perform,inexpensive,reproducible as well as to give numerical and accurate results in real *** should be predictive of long term outcomes related with fibrosis and PHT to allow prognostic ***,many types of noninvasive alternative tests have been developed and are under *** particular,imaging and ultrasound based tests,such as transient elastography,have shown promising *** most of these noninvasive tests effectively identify severe fibrosis and PHT,the methods available for diagnosing moderate disease status are still insufficient,and further investigation is essential to predict outcomes and individualize therapy in this field.

关键词： Hepatic fibrosis Portal hypertension Liver biopsy Hepatic venous pressure gradient Non-invasive test Transient elastography

Consistency of intensity ratio between spectral lines with similar self-absorption characteristics during ungated laser induced breakdown spectroscopy measurements

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Plasma Science and Technology 2019年第3期21卷 77-83页

作者： Jung-Hwan IN Youngmin moon Jang-Hee CHOI Sungho jeong Optical Lens Research Center Korea Photonics Technology Institute School of Mechanical Engineering Gwangju Institute of Science and Technology

This work reports that the intensity ratio of spectral lines having similar self-absorption characteristics during laser induced breakdown spectroscopy(LIBS) analysis can become nearly constant over a wide range of irradiation conditions if the intensities are integrated over a sufficiently long time. It is shown that the plasma temperature and intensity ratio of these spectral lines have temporal similarity. The spectral lines with similar self-absorption properties may be selected to improve the accuracy and consistency of LIBS analysis results under an environment with fluctuating measurement conditions.

关键词： laser induced breakdown spectroscopy intensity ratio self-absorption characteristics CIGS solar cell

Endoscopic treatment of efferent loop syndrome with insertion of double pigtail stent

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World Journal of Gastroenterology 2013年第41期19卷 7209-7212页

作者： Woo Yong Lee jeong Seop moon Department of Surgery Seoul Paik HospitalInje University College of MedicineSeoul 100-032South Korea Department of Internal Medicine Seoul Paik HospitalInje University College of MedicineSeoul 100-032South Korea

Efferent loop syndrome is a very rare postgastrectomy syndrome that can occur following Billroth-Ⅱor Rouxen-Y *** most common loop syndrome after gastric surgery is afferent loop syndrome;however,efferent loop syndrome has been reported in rare ***,we report a case of efferent loop obstruction that occurred after postoperative adhesiolysis of a small-bowel *** patient had undergone a partial gastrectomy with BillrothⅡanastomosis and gastric ulcer perforation 30 years *** efferent loop obstruction was successfully resolved by the insertion of a double pigtail *** the best of our knowledge,this is the first case in the literature describing the treatment of efferent loop obstruction.

关键词： Efferent loop syndrome Double pigtail stent Postgastrectomy syndrome