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주행노면에 따른 동력장치의 상대 피로 손상도 평가 기법에 관한 연구
이상호(Sang Ho Lee),이정환(Jeong Hwan Lee),강도경(Do Kyung Kang),구상화(Sang Hwa Goo) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.12
This paper focuses on improvement of the reliability for endurance test to serve military automobiles. The driving loads have been measured by use of the wireless telemetry system for the drive shaft of the 4-wheel drive car. In order to analyze the transmission input torque and engine revolution of loads of the test courses and unpaved road have been made use of the revolution counting and cumulative damage by miner's rule. This paper presents the evaluated result for quantified damage about the test courses and roads.
내구시험의 무인 주행화를 위한 비포장 주행 환경 자동 인식에 관한 연구
이상호,이정환,구상화,Lee, Sang Ho,Lee, Jeong Hwan,Goo, Sang Hwa 한국시스템엔지니어링학회 2005 시스템엔지니어링학술지 Vol.1 No.2
In this paper, an algorithm is presented to recognize road based on unpaved test courses image. The road images obtained by a video camera undergoes a pre-processing that includes filtering, gray level slicing, masking and identification of unpaved test courses. After this pre-processing, a part of image is grouped into 27 sub-windows and fed into a three-layer feed-forward neural network. The neural network is trained to indicate the road direction. The proposed algorithm has been tested with the images different from the training images, and demonstrated its efficacy for recognizing unpaved road. Based on the test results, it can be said that the algorithm successfully combines the traditional image processing and the neural network principles towards a simpler and more efficient driver warning or assistance system.
양진생(Jin Saeng Yang),이상호(Sang Ho Lee),구상화(Sang Hwa Goo),이정환(Jeong Hwan Lee),강도경(Do Kyoung Kang) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.2
The vibration environment essentially companied by vehicle operation on the road is determined by the shape of road surface, which is called profile. In general, the profile and severity of unpaved road is an important issue in the reliability of durability test for vehicles. In order to maintain severity of unpaved road, it is necessary to develop profilometer system. We developed profilometer system which is composed of data processing computer, power unit, air compressor and sensors. This paper focuses on the severity management of unpaved test courses using neural networks. This paper presents the maintenance range for cross-country course in CPG(Chang-won Proving Ground) and the evaluation of similarity degree between unpaved roads.
비포장 시험로의 노면 굴곡 측정 및 가혹도 분석을 위한 노면굴곡측정장비 개발
양진생(Jin Saeng Yang),이상호(Sang Ho Lee),구상화(Sang Hwa Goo),배철훈(Cheol Hoon Bae) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.1
The vibration environment essentially companied by vehicle operation on the ground is determined by the shape of road surface, which is called profile. This paper focuses on development of a profile and severity measurement system for unpaved test courses. In general, the profile and severity of unpaved road is an important issue in the reliability of endurance test. In order to measure unpaved road profile and severity, it is necessary to develop a profilometer system. The developed profilometer system is composed of data processing computer, power unit, air compressor and sensors(encoder, vertical gyro and laser displacement) This paper presents the measuring system configuration, measurement principle of road profile and analysis method of road characteristics used at CPG(Changwon Proving Ground) for this purpose.