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자동차용 현가장치의 반능동 제어 시스템의 설계파라미터에 대한 연구
박호,한창수,이명호,노병옥 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
In the determination of control laws of semi-active suspension system, optimal control theory is applied, which used in the design of fully active suspension system and in the performance index sense. Optimal semi-active control laws are designed, and the computer program is developed for estimation of performance in the time and frequency domain. It is certified that in the semi-active control system, it is desirable to minimize the spring constant and damping coefficient as possible in the given constraints. The effect of performance improvement which is almost equal to fully active type is obtained.
Development of Application Technique of Aluminum Sandwich Sheets for Automotive Hood
김기주,Meung Ho Rhee,최병익,김철웅,성창원,한창평,강기원,원시태 한국정밀공학회 2009 International Journal of Precision Engineering and Vol. No.
Objective of this study was to develop basic techniques in order to apply aluminum sandwich sheets for an automotive hood part. The aluminum sandwich sheet is the material fabricated by adhering two aluminum skins to one polypropylene core. When it has the same bending stiffness as a steel sheet, it is 65% lighter than the steel sheet and 30% lighter than an aluminum alloy sheet. Therefore, it is notified exclusively as good substitutive materials for a steel body to improve the fuel efficiency. Through aluminum sandwich sheet, however, it has relatively lower formability than that of the steel sheet for automotive application. In this study, we developed application techniques of the aluminum sandwich sheet for automotive hood. The various formability evaluations were carried out in order to secure the fundamental data for the measurement of sheet metal forming and the establishment of optimum application conditions of the sandwich sheet. From these results, it was found that the sandwich sheet could reduce the weight and maintain the flexural rigidity simultaneously comparing to the steel sheet.
Development of Application Technique of Aluminum Sandwich Sheets for Automotive Hood
Kim, Kee-Joo,Rhee, Meung-Ho,Choi, Byung-Ik,Kim, Cheol-Woong,Sung, Chang-Won,Han, Chang-Pyung,Kang, Ki-Weon,Won, Si-Tae 한국정밀공학회 2009 International Journal of Precision Engineering and Vol.10 No.4
Objective of this study was to develop basic techniques in order to apply aluminum sandwich sheets for an automotive hood part. The aluminum sandwich sheet is the material fabricated by adhering two aluminum skins to one polypropylene core. When it has the same bending stiffness as a steel sheet, it is 65% lighter than the steel sheet and 30% lighter than an aluminum alloy sheet. Therefore, it is notified exclusively as good substitutive materials for a steel body to improve the fuel efficiency. Through aluminum sandwich sheet, however, it has relatively lower formability than that of the steel sheet for automotive application. In this study, we developed application techniques of the aluminum sandwich sheet for automotive hood. The various formability evaluations were carried out in order to secure the fundamental data for the measurement of sheet metal forming and the establishment of optimum application conditions of the sandwich sheet. From these results, it was found that the sandwich sheet could reduce the weight and maintain the flexural rigidity simultaneously comparing to the steel sheet.
조향감을 고려한 자동차용 전동조향장치의 퍼지제어기의 개발
한창수,이명호,박호 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.2
The test method using simulator to objectively measure the steering fell from several drivers was proposed. It has also described the ideas to analyse the principal factors affecting the steering feel of the driver using the correlation analysis of the measured data and questionnaire. Proportional Derivative(PD) controller has been used to measure the steering feel, and the control parameters have been selected to obtain the optimal steering feel. Membership functions of Sugeno fuzzy model are constructed from the assist torque values calculated from PD controller at each steering state. Moreover to verify the performance, this fuzzy controller has been compared with the another fuzzy controller of membership functions are derived from the knowledge of drivers. As a result, it can be concluded that the proposed fuzzy controller improves the steering feel at each steering stat move than any other conventional methods.
Bom Sok Kim,Woo Yooung Chung,Meung Ho Rhee,이상율 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.6
Recently, laser texturing has received lots of attention for improving the tribological performance of various surfaces, and this laser texturing of surfaces could be applied to improve the tribological performance of PVD coated surfaces. In this work two different patterns of laser surface texturing were performed on H13 substrate, and PVD AlCrSiN coatings with various N2 contents were made by unbalanced magnetron sputtering on the textured H13 specimens. The coating characteristics such as crystalline structure, surface morphology, hardness, and friction coefficient of the coatings as a function of the N2 partial pressure were investigated by X-ray diffraction (XRD), atomic force microscopy (AFM), microhardness tester, and wear test. Synthesis of the AlCrSiN thin films containing various N2 contents was successful using the unbalanced magnetron sputtering process. A dense and compact microstructure, as well as a very smooth surface,were observed from the synthesized thin films, which could be attributed to the addition of Si into the AlCrN films, producing an amorphous phase in the films. Also the hardness of the AlCrSiN films increased with increasing N2 partial pressures and the maximum hardness of approximately 33 GPa was measured from the AlCrSiN film synthesized with N2 partial pressures of 0.16 Pa. From the wear tests against an Al2O3 counterpart ball at room temperature without lubrication, the average friction coefficient of the non-textured AlCrSiN films of 0.42 was decreased to 0.38 and 0.36 for dimple-textured and honeycomb-textured AlCrSiN films, respectively. Laser surface texturing on the AlCrSiN films reduced the friction coefficients by approximately more than 15%, and further improvement on the tribological performance of the textured surfaces could be possible by optimizing the honeycomb-textured surfaces.
경차용 전동조향장치의 성능평가를 위한 시뮬레이터의 개발
한창수,이명호,박호,오재응,Hahn, Chang-Su,Rhee, Meung-Ho,Park, Ho,Oh, Jae-Eung 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.6
Steering system is most important for vehicle in safety and driving feel. However, testing using real car to improve steering feel is often difficult in aspect to repeatability, safety and money. Repeatability in testing steering system is very important because steering feel for driver is variable according to the environment condition. And steering testing of vehicle is so dangerous that driver may not concentrate in testing. In this paper, the steering system simulator using front part of steering and suspension system was developed. We can test the electric power steering system for the light weight vehicle using this simulator cheap, safely and repeatably.
Space Frame 용 알루미늄 압출튜브의 충돌흡수에너지 평가
김동국,이성학,이명호,김승보 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.2
The compressive deformation behavior under dynamic loading was investigated using a high performance servo-hydraulic machine in order to evaluate experimentally impact absorption energies of extruded aluminum tubing for space frame. Dynamic compression tests were conducted for three extruded aluminum tubing whose thicknesses were 1.5 ㎜, 2.0 ㎜, and 3.0 ㎜, and then the test data were compared via observation of deformation mode. The results indicated that the dynamic deformation behavior correlated well with load-displacement curve data, i.e., the number of peaks formed by the compression-resistant force matched with the number of plastic hinges formed during compression. In the tubing with thickness of 3.0 ㎜, the number of plastic hinges decreased, and bending occurred seriously. This leaded to drop in impact absorption energies per unit cross-sectional area since energies could not be absorbed effectively upon bending. These findings suggested that in order to improve impact absorption energies of the extruded aluminum tubing for space frame, their thickness less than 3.0 ㎜ and the design of their cross-section for promoting folding instead of bending were recommended.
용탕단조법으로 제조된 Al-Ni 복합재료 피스톤링의 파괴기구
이성학,추성훈,이명호 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.1
The main objective of this study is to investigate the effect of microstructure on the fracture behavior in two Al-Ni composite piston rings fabricated by squeeze casting method. Microstructural observation and insitu SEM fracture test were conducted on the composites to identify the microfracture processes. Detailed microstructural analyses showed that the reinforcing Ni contained an amount of Ni₃Al and NiAl phases near the Ni/Al interfacial region, which enhance the overall hardness of the composites. It was also found from in-situ observations of crack initiation and propagation that the interfacial debonding occurred at the Ni/Al interface in the early loading stage, providing an easy crack propagation path. In order to improve mechanical properties of the composite piston rings, thus, the improvement of interfacial properties by applying a new coating method is suggested.