• Journal of KSNVE
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• v.6 no.6
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• pp.843-849
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• 1996

Locations and emission characteristics of noise source of motor vehicles are great important factors to control the road traffic noise in effective ways. From results of this study on emission characteristics of engine and exhaust noise, we could find that every noise emission of different kind of vehicles has smilar pattern. The main emission locations of engine noise for the front of vehicle became the space between the road surface and bottom of the body and radiator grill, and for the side of vehicle became the space between the road surface and bottom nearby the front wheel. In case of exhaust noise of passenger-car and light truck, all the highest sound intensity level located near surface of road. But it is hard to conclude the height of noise source of driving vehicles with only results of this study. So further studies are needed to check the emission characteristics of noise.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.383-386
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• 2001

최근 선진 자동차 회사에서는 변속기 개발 단계에서 기어 소음 문제를 해결하고 차량의 소음 품질을 향상시키기 위하여 많은 연구가 수행되고 있다. 그러나, 설계 단계에서 기어 소음을 고려한 기어 제원 결정이 불가능하여, 설계 완료 후 개발 단계에서 기어 소음 문제를 해결하는 것이 매우 어려운 일이었고, 설사 가능하여도 시간적, 성능적인 한계가 있었다. 기어 소음은 크게 Source 와 전달경로의 문제로 나누어지고, 본 연구는 주로 전자에 중점을 둘 것이며, 기어 화인 소음의 주 요인으로 알려져 있는 기어의 전달 오차를 최소화하는 것이다. 그 방법으로 기어 설계의 선진 핵심 기술인 기어 해석을 통한 기어 화인 소음을 최소화하는 최적 기어 설계 제원 결정이다.

• Journal of Auto-vehicle Safety Association
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• v.8 no.4
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• pp.6-11
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• 2016

The objective of this study is to present the inspection standards of motorcycle lamps affecting motorcycle traffic accident in night time. The inspection standards of motorcycle lamps recommended by CITA International Motor Vehicle Inspection Committee are surveyed. Also, the domestic safety standards of motorcycle and inspection standards of passenger car are considered. The inspection standard and method with principal reasons of rejections of head-lamp, number plate lamp, front-rear position lights, stop lamp and direction indicators of motorcycles are suggested.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.277-278
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• 2006

As a development of technology, electric power steering system which uses an electric motor came to use in recent and it can solve the problems with hydraulic power steering system. In this paper, vehicle model and electric power steering system are combined to fulfill full vehicle model. By simulation effect of motor torque assist through electric power steering revealed effective, and full vehicle model are proved reasonable through comparison with real car experimental datum.

• Proceedings of the KIEE Conference
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• 2001.04a
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• pp.413-415
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• 2001

A railroad vehicle(Light weight electric rail car, Urban railroad, High-speed railroad) need to construct propulsion- system capacity experiment equipment to test performance or to estimate confidence. Experiment equipment in interior have been used Flywheel which is equal to the same inertia as railroad straight moment. But mechanical inertia using flywheel don't change inertia and can't embody traveling-struggle which is similar to actual traveling-struggle. We propose the method to embody electric railroad load system with inertia using electric servo motor in order to get the characteristic of real vehicle load, and confirm this algorithm with simulation and experiment.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1442-1444
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• 2000

High speed switching action of PWM inverter is being further advanced for electric motor vehicles. Due to this high speed switching action, extensive high frequency electromagnetic noise emerges. Therefore counterm-easures against electromagnetic interference of electric motor vehicles become increasingly important. This paper describes the theory and countermeasure principle of EMI prevention and EMI test method for Korean Standard EMU.

• Journal of Mechanical Science and Technology
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• v.17 no.8
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• pp.1113-1119
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• 2003

Experimental and numerical analyses were performed to characterize the fatigue behavior of spot welded joints in suspension mounting of a passenger car body. Static and fatigue tests were carried out for the tensile-shear and cross-tension specimens. S-N curve and fatigue strengths were obtained from the fatigue test of various specimens. Nonlinear finite element analysis showed that fatigue behavior of spot welded joints could be well estimated in terms of Von Mises stress at the nugget edge. Fatigue behavior of spot welded joint was represented by Von Mises stress better than the fatigue load.

• Proceedings of the KSR Conference
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• 2000.05a
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• pp.589-597
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• 2000

This paper deals with the basic design of the traction motor(TM) by performing the train performance simulation(TPS). The TPS, considering min condition, provides some important information about selecting the latins of TM such as current, power and frequency, etc. Especially, calculating the current flowing into the TM by the TPS in the situation of normal condition and M-car cut out respectively, we can inspect whether the TM endures thermally under the contingency or not. This paper reviews the tractive effort of the train to meet the demands of consumer and then designs the TM electrically. finally, performing the TPS under emergency condition, it checks the thermal capacity of the TM to insure the justice of the TM under construction.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.239-242
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• 2000

In the present study, the influence of car body structures to the noise and vibration characteristics has been sought. The numerical modal analysis for the body-in-white is employed to predict the vibratory response of structure, and then followed by the experimental modal testing to confirm the validity of the model. Using the results of numerical simulations with the designated modal parameters, the optimal structural configuration has been deduced. Special interests have been paid to the sensitivity of sound quality to the structural integrity. Since the structural integrity has a close relationship to the structure-born noise, the substantially low frequency range, which is far below the frequency range almost barely sensible by human auditory organ but still quite influential to overall impression, is especially examined. The subjective assessment agrees with the objective evaluation by means of traditional sound measures as well as psychoacoustic metrics.

• Transactions of the Korean Society of Automotive Engineers
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• v.15 no.1
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• pp.125-132
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• 2007

Within the framework of brake-by-wire technology, this paper presents five types of novel models of electro-mechanical disk brake calipers with self-servo mechanism which provides self-servo effect of boosting a friction force generated between the brake pad and the rotor disk surface. The models have been developed utilizing patent map analysis results of previous invents of electro-mechanical brake calipers. The feasibility of the developed motor-driven brake caliper models have been validated through the dynamic simulation analysis. Among the developed models, the caliper mechanism with separated pressure plate was designed especially in detail and was made as a pilot. The pilot caliper has been installed on the simple test bed constructed with domestic passenger car brake components, and its function and effectiveness have been validated through several types of experimental tests.