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신범식(Bum-Sik Shin),천광욱(Kwang-Wook Chun),최연선(Yeon-Sun Choi) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The source of the vibration of railway vehicles in the cabin is usually bogie, axle, and wheel. The vibration is transmitted through the floor structures of railway vehicle. The floor structure is the combination of bottom plate, plywood, and rubber. In this research the vibration transmission ratio is measured experimentally and analyzed numerically to find the transmission characteristics of the vehicle floor structures. the result shows that the vibration characteristic of a soft rubber is better than a hard rubber or a wood as a connecting material between the bottom plate and the plywood. It can be explained by the characteristics of the materials itself of the rubber and the wood.
신범식(Shin Bum-Sik),천광욱(Chun Kwang-Wook),최연선(Choi Yeon-Son) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Type of the high-speed train under development has been decided to be EMU(electric multiple Units) following the trend of the times, which is weak for vibration and noise due to the distributed traction unit of motors and gears than that of the articulated high-speed train. Also, passengers may feel uncomfortable at high-speed running due to the various vibration of vehicle itself and bogie, especially due to hunting, snake motion of the high-speed train. In this paper, explained was the program to develop the high-speed EMU at every step of basic and detail design and running test, predict and try to reduce the vibration.
간이잔향실을 이용한 철도차량 바닥재의 음향투과손실 측정
신범식(Shin Bum-Sik),천광욱(Chun Kwang-Wook),최연선(Choi Yeon-Sun) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
This study is to examine the sound transmission loss of a railway vehicle floor. To this end, a semi-reverberation room was constructed. The semi-reverberation room was made of a railway vehicle floor between the sound radiating chamber and the sound receiving chamber. To block the sound, the wall was made of acryl, urethane foam, wood, and glass fiber. The test followed the KS F 2808 standard, and a typical reverberation room was used to verify the performance of the semi-reverberation room. As a result, comparison of the measurements showed that the test results of the semi-reverberation room had the same tendency as those of the reverberation room. Consequently it was possible to measure the sound transmission loss of railway vehicle structures using the semi-reverberation room.
신범식(Bum-Sik Shin),천광욱(Kwang-Wook Chun),최연선(Yeon-Sun Choi) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.11
The sources of the vibration of railway vehicles in the cabin are usually bogie, axle, and wheel. The vibrations are transmitted through the floor structures of railway vehicle. The floor structure is the combination of bottom plate, plywood, and rubber. In this research the vibration transmission is measured experimentally and analyzed numerically to find the transmission characteristics of the vehicle floor structures. The result shows that the vibration characteristic of soft rubber is better than hard rubber or wood as the connecting material between the bottom plate and the plywood.