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철도차량 하부 부품 이상 감지를 위한 적외선 열화상 분석 방법
강부병 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.6
IR camera has been used widely for the temperature measurement and fault detection of the moving bodies and rotating bodies. The high-speed performance of the IR camera and a reliable thermal analysis method are required for the condition monitoring of the railway vehicle running at high speed. The effective fault detection method using a thermal image analysis could make a real time monitoring of the high speed train possible. Therefore the investigation of the performance of the thermal image analysis method was performed to find the effective thermal image data analysis method. The results suggested that the comparison of the characteristics of the temperatures obtained at different conditions and a continuous temperature subtraction method could be used as a useful analysis method for detecting abnormal temperature condition and histogram equalization could also help to enhance the fault detectability by increasing the contrast of the thermal image.
철도차량 차륜답면 마찰계수 변화가 차량 주행안전성에 미치는 영향 해석
강부병 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.5
The adhesion coefficient of railway wheel, which is also called as friction coefficient between wheel and rail is an important factor for obtaining the sufficient tractive force and the reliable braking performance at high speed operation of train. The adhesion coefficient can be affected by the conditions of the interface and the materials existing between the wheel and the rail such as oil, water and leaves. It could be also changed by a method to reduce the wear of the wheel and surface treatment of the wheel tread for higher adhesion coefficient. The friction coefficient is also well known as one of the factors which should be controlled carefully for securing the running safety of train. Therefore the investigation of the influence of the friction coefficient of wheel tread on the running safety of the vehicle was investigated. The results show that the effect of curve radius on the derailment coefficient is larger than that of the difference of the tread friction coefficient between left wheels and right wheels.
강부병 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.5
One of the important advantages of Thermosonics is that it can be applied to complex structures such as a turbine blade as a convenient and quick screening test method. For a reliable thermosonic test, the vibrational characteristics of the system comprising the tested structure and the clamp at ultrasonic frequency range should be identified. Therefore, this study presented the analysis results offrequency response functions and mode shapes of the turbine blade and clamp system and investigate the possibility of the reliable excitation system for the thermosonic test.