Abstract
Ride quality became a very important factor in the performance of railway vehicles according to the expansion of high-speed railways and speedup of velocity of railway vehicles. In this study, the results of applying the MR (magnetorheological) lateral damper on the secondary suspension to reduce the vibration of the car body, directly relating to the ride quality of railway vehicles, were mentioned. In order to verify the control performance of MR dampers, a 1/5 scaled railway vehicle model was constructed, and numerical simulation and experimental tests were conducted. The MR damper for the experimental tests was produced and was attached between the car body and bogie of a full scaled vehicle, and a vibration controlling test was performed to improve ride quality on a roller rig. The skyhook control algorithm was used as the controlling technique, and regarding the test results, the RMS (root mean square) value was found by compensating the frequency of the lateral vibration based on the UIC 513 R Standard about the ride quality of railway vehicles. As a result of the test, it could be confirmed that vibration was reduced by approximately 24% when attaching the MR damper between the bogie and the car body compared to when applying a passive damper.
Highlights
The vibration of railway vehicles reduces ride quality by direct application to passengers, and affects running stability
Along with the speed increase of railway vehicles globally, procurement of running stability and ride quality became an important task; technology development applying semiactive and active suspension is being actively researched in various fields. [1,2,3] Research on semiactive and active suspensions of railway vehicles is not easy due to the difficulty of increased testing time and production cost for applying various technologies or new mechanisms, due to the large sized experiment equipment and vehicles compared to automobiles
Because railway vehicles have the unique characteristics by which the railway wheels make rolling contact on the rail, breaking down of the controller or suspension elements such as semiactive dampers or active actuators used in semiactive and active suspensions applied to railway vehicles can lead to a catastrophic accident
Summary
The vibration of railway vehicles reduces ride quality by direct application to passengers, and affects running stability. Along with the speed increase of railway vehicles globally, procurement of running stability and ride quality became an important task; technology development applying semiactive and active suspension is being actively researched in various fields. Lau and Liao [8] performed performance tests on the unit component by designing and developing MR dampers for railway vehicles They performed a semiactive control simulation by applying the result on the numerical simulation model, and the on-off control technique was used, showing a result of a maximum of 38.9% reduction of the vibration of car body. It was conducted to reduce the lateral vibration of the car body with simple skyhook control by attaching the MR damper laterally, an element of semiactive suspension, which has not been introduced in railway vehicles yet. An MR damper was attached on a full scaled railway vehicle, and the validity of the control performance was sought to be verified through a running test
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