• The tire
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• s.155
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• pp.9-22
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• 1991

본 자료는 1990년 4월 13일 일본 Posty Corporation의 후원을 받아 ‘일본고무협회’가 개최한 ‘제3회 공개포럼’에서 발표한 ‘고무공업의 기술예측(자동차용 타이어를 중심으로)’ 내용 중의 일부로서 황빈고무(주) 타이어재료연구개발실의 석천 태홍씨, 동지실리콘(주) 브레이크 호스사업부의 주교유일 차장, 동양고무공업(주) 기술개발연구소의 도전 사랑 부부장, (주)Kuraray 이 소프렌연구개발실의 항야 상무씨, 일본합성고무(주) 합성고무사업본부 관리부 기술과 신원 만언씨가 발표한 것을 번역 · 정리한 것으로 앞으로 3회에 걸쳐 소개하고자 한다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.06a
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• pp.53-55
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• 2002

본 연구는 자동차 급발진 사고에 관한 안전장치 개발에 그 목표를 두고 있다. 최근들어서 자동차 급발진 사고는 사회문제화되고 있고, 인명피해뿐만 아니라 자동차회사와 소비자간의 법적 피해 보상문제가지도 대두되고 있으며, 최근 자동차 설계구조의 문제가 있다는 법적 해석이 나오기도 했다. 본 연구는 자동변속기를 장착한 자동차의 급발진 방지용 변속레버 제어장치에 관한 것으로 구체적으로는 브레이크 페달을 밟고 있어야 변속레버조작이 이루어지도록 한 변속레버 제어수단을 솔레노이드 작동에 의한 스토퍼로 제어하되 스토퍼를 걸림 작동부로 간편하고 있도록 한 안전장치이다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.11a
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• pp.1120-1124
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• 2007

Recently in the automotive brake industry brake squeal noise has become one of the top automotive quality warranty issues. The contact pressure is used to predict friction coupling in the brake squeal analysis. The formulation of friction coupling has performed by nonlinear static analysis prior to the complex eigenvalue analysis. This paper proposes a validation methodology of squeal analysis using modal testing and contact analysis and examines the effect of predicted contact pressure that leads to the discrepancy between unstable complex mode and squeal frequency. This studies compose a three step validation process : examining the modal characteristics of component and assembly loaded contact pressure using modal testing and FEM analysis and verifying the contact pressure distribution using nonlinear static analysis and experiment. Finally, the unstable modes from complex eigenvalue analysis and realistic squeal frequency from the noise dynamometer are investigated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.11
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• pp.6406-6411
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• 2014

This paper presents the analytical-FE (finite element) squeal model, which can provide the efficient simulation time and accuracy. The system geometry and the extraction of the vibration modes were constructed using the finite element method. Instead, the friction contact model was derived from theoretical contact kinematics of the rotating disc and the stationary pads. This modeling procedure was incorporated into the perturbed equations of motion based on the finite elements of the system. Throughout the analytical-FE squeal model, the accuracy of linear stability analysis and the simulation time of FE squeal analysis were improved. In addition, the sensitivity of contact stiffness on brake squeal and the mode-coupling mechanism were provided by the system parameter study.

• Tribology and Lubricants
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• v.38 no.2
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• pp.63-69
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• 2022

In this research, the rotordynamic characteristics of the labyrinth seal with and without swirl brake were predicted using the computational fluid dynamic (CFD) model. Based on previous studies, a simple swirl brake consisting of square vanes without stagger angle is designed and placed in front of the seal inlet. The rotating frame of reference is utilized to consider the whirling motion of the rotor in the steady-state analysis since the whirling motion is transient behavior in nature. CFD analysis was performed in the range of -1 to 1 pre-swirl ratio for a given seal and swirl brake design and operating conditions. The CFD analysis result shows that the swirl brake effectively reduces the pre-swirl since the circumferential fluid velocity of labyrinth seal with swirl brake was lower than that without swirl brake. The cross-coupled stiffness coefficient, which is greatly affected by the circumferential fluid velocity, increased with an increasing pre-swirl ratio in a seal without a swirl brake but showed a low value in a seal with a swirl brake. The change in the damping coefficient was relatively small. The effective damping coefficient of the labyrinth seal with swirl brake was generally constant and showed a higher value than the labyrinth seal without swirl brake.

• Journal of Aerospace System Engineering
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• v.18 no.3
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• pp.65-69
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• 2024

This study aimed to analyze the structural integrity of a sensor control box, a critical component for real-time monitoring of brake chamber pressure in large commercial vehicles and trailers. We utilized the computational analysis program ANSYS Workbench R2021 based on our testing conditions and vibration test specification KS R1034. Through modal analysis, we identified resonance frequencies within the frequency range of 5 Hz to 100 Hz and compared results in the frequency range of 33 Hz to 67 Hz using harmonic analysis.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.425-426
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• 2014

본 논문은 전기자전거용 충전 기능이 내장된 양방향 부스트 컨버터 기반의 DC 모터 구동 회로를 제안한다. 추가 전력 단 구현 없이 배터리 충전 기능을 내장한 양방향 부스트 컨버터 기반의 DC 모터 구동회로로써 회로 부피 및 원가 저감이 가능하고 회생충전모터의 작동을 통해 자가발전을 유도함과 동시에 안정적인 브레이크 기능 유도가 가능하다. 제안한 회로의 이론적 분석을 행하고, 모의실험을 통하여 타당성을 검증하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.11
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• pp.5392-5395
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• 2013

Application of electric wheelchair, sort of wheelchair which is playing important role in transporting patients and old people, has been increasing. In this study, we designed the electric wheelchairs' driving system. Using the multi-step gear, the driving system can get great power, even though the small capacity of motors. First, we designed the multi-step gear, test its bending strength and contact strength, as well as verified its performance. We installed 'B-type electric brake(Multiple plate clutch, Anti-magnetization) in same axle of the driving system, so it is possible to stop under huge torque and small size. Using this driving system of the multi-step gear which we designed, it's possible to improve driving gear efficiency 30% up and create the high-competitive electric wheelchair. And, it is easy to repair and control.

• Journal of the Society of Disaster Information
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• v.17 no.2
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• pp.319-328
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• 2021

Purpose: Recently, a large social disaster has called for the need to diagnose social disaster safety, and the Ministry of Public Administration and Security calculates and publishes regional safety ratings such as regional safety index and national safety diagnosis every year. The existing safety diagnosis system uses equal intervals or normal distribution to grade risk maps in a uniform manner. Method: However, the equidistant technique can objectively analyze risk ratings, but there is a limit to classifying risk ratings when the distribution is skewed to one side, and the z-score technique has a problem of losing credibility if the population does not follow a normal distribution. Because the distribution of statistical data varies from indicator to indicator, the most appropriate rating should be applied for each data distribution. Result: Therefore, in this paper, we analyze the data of disaster indicators and present a comparison and suitable method for traditional equidistant and natural brake techniques to proceed with optimized grading for each indicator. Conclusion: As a result, three of the six new indicators were applied differently from conventional grading techniques

• Journal of Environmental Impact Assessment
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• v.25 no.3
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• pp.175-189
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• 2016

The guideline for railway noise mapping is notificated in the administration law for noise/vibration which is announced by the ministry of environment, Korea. Here input parameters for the railway sound sources are proposed for each prediction models. In case of the application of the vehicle characteristics it is suggested to choose "0(%)" for the disc brake parameter. However new trains have been in revenue service since the announcement of the guideline, an investigation of the effect of the input parameters of the foreign railway prediction models on the prediction results of korean railway systems are needed. In this paper the sound prediction results are analyzed with a focus on the input parameters such as disc brake percentage, rail roughness, rail joints. Schall03 is used for the railway noise prediction which has been using most frequently in Korea. The results are shown and discussed.