Computational Technology Resources - CCP

Keywords: tilting train, pneumatic control, ride comfort, motion sickness.

Summary

In Japan, pneumatic actuators are very popular for the tilt actuators of tilting trains. However, the tilting system has a certain problem area causing a possible motion sickness arising from the delay in tilting on transition curve sections and unstable rolling motion on straight tracks. In recent years, we have developed a new tilting system with an electro-hydraulic actuator [1]. However, the system has the following two problem areas: One is that the electro-hydraulic actuator (EHA) is expensive, about triple the cost compared with the pneumatic actuator. Another problem area is that the high stiffness of the EHA increases the lateral vibration frequency to exceed 1 Hz. To avoid these problems, we studied how to improve the performance of the conventional tilting system with a pneumatic actuator.

Initially, we worked on improving the response to the target angle and ensuring the control stability. Some bench tests were carried out with a full-scale experimental apparatus which simulates the tilting motion.

Secondly, we analysed the ride comfort of a single vehicle model by multi-body dynamic simulation. We calculated the motion sickness dose value for lateral motion (MSDVy) [2] and the ride comfort index from the acceleration observed on the floor of the vehicle body.

The following conclusions were made:

In order to improve the response of the pneumatic actuator, it is effective to use a flow control valve instead of a pressure control valve and to remove a tilt damper for resistance reduction.
In order to ensure the control stability, it is effective to apply an acceleration feedback loop of the piston, which works with the position feedback of the piston.
We developed a pneumatic damper circuit with one orifice and two pressure relief valves. Furthermore, the circuit was integrated into the actuator.
From the simulation results, it was found out that the new actuator decreased the motion sickness (MSDVy value) by 45% when compared with the value in the case of passive tilting without control, by 25% when compared with the value in the case of the conventional actuator.
From the experimental results, it was found out that the new actuator did not increase the lateral vibration of the car body. Furthermore, it was clarified from the simulation results, that the new actuator did not worsen the ride comfort index.

References

1: M. Enomoto, S. Kamoshita, M. Kamiyama, K. Sasaki, T. Hamada, A. Kazato, "Development of Tilt Control System Using Electro-Hydraulic Actuators", Quarterly Report of RTRI, 46(4), 219-224, 2005. doi:10.2219/rtriqr.46.219
2: H. Suzuki, H. Shiroto, K. Tezuka, "Effects of Low Frequency Vibration on Train Motion Sickness", Quarterly Report of RTRI, 46(1), 35-39, 2005. doi:10.2219/rtriqr.46.35

purchase the full-text of this paper (price £20)

go to the previous paper
go to the next paper
return to the table of contents
return to the book description
purchase this book (price £110 +P&P)

	Computational & Technology Resources an online resource for computational, engineering & technology publications
	not logged in - login
Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 98 PROCEEDINGS OF THE FIRST INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 182 Suppression of Low-Frequency Lateral Vibration by Improving the Response of Pneumatic Actuators for Tilt Control A. Kazato¹, S. Kamoshita² and Y. Yamanaga¹ ¹Running Gear Laboratory, ²Vehicle Noise and Vibration Laboratory, Railway Technical Research Institute, Tokyo, Japan doi:10.4203/ccp.98.182 purchase the full-text of this paper Full Bibliographic Reference for this paper A. Kazato, S. Kamoshita, Y. Yamanaga, "Suppression of Low-Frequency Lateral Vibration by Improving the Response of Pneumatic Actuators for Tilt Control", in J. Pombo, (Editor), "Proceedings of the First International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 182, 2012. doi:10.4203/ccp.98.182 Keywords: tilting train, pneumatic control, ride comfort, motion sickness. Summary In Japan, pneumatic actuators are very popular for the tilt actuators of tilting trains. However, the tilting system has a certain problem area causing a possible motion sickness arising from the delay in tilting on transition curve sections and unstable rolling motion on straight tracks. In recent years, we have developed a new tilting system with an electro-hydraulic actuator [1]. However, the system has the following two problem areas: One is that the electro-hydraulic actuator (EHA) is expensive, about triple the cost compared with the pneumatic actuator. Another problem area is that the high stiffness of the EHA increases the lateral vibration frequency to exceed 1 Hz. To avoid these problems, we studied how to improve the performance of the conventional tilting system with a pneumatic actuator. Initially, we worked on improving the response to the target angle and ensuring the control stability. Some bench tests were carried out with a full-scale experimental apparatus which simulates the tilting motion. Secondly, we analysed the ride comfort of a single vehicle model by multi-body dynamic simulation. We calculated the motion sickness dose value for lateral motion (MSDVy) [2] and the ride comfort index from the acceleration observed on the floor of the vehicle body. The following conclusions were made: In order to improve the response of the pneumatic actuator, it is effective to use a flow control valve instead of a pressure control valve and to remove a tilt damper for resistance reduction. In order to ensure the control stability, it is effective to apply an acceleration feedback loop of the piston, which works with the position feedback of the piston. We developed a pneumatic damper circuit with one orifice and two pressure relief valves. Furthermore, the circuit was integrated into the actuator. From the simulation results, it was found out that the new actuator decreased the motion sickness (MSDVy value) by 45% when compared with the value in the case of passive tilting without control, by 25% when compared with the value in the case of the conventional actuator. From the experimental results, it was found out that the new actuator did not increase the lateral vibration of the car body. Furthermore, it was clarified from the simulation results, that the new actuator did not worsen the ride comfort index. References 1 M. Enomoto, S. Kamoshita, M. Kamiyama, K. Sasaki, T. Hamada, A. Kazato, "Development of Tilt Control System Using Electro-Hydraulic Actuators", Quarterly Report of RTRI, 46(4), 219-224, 2005. doi:10.2219/rtriqr.46.219 2 H. Suzuki, H. Shiroto, K. Tezuka, "Effects of Low Frequency Vibration on Train Motion Sickness", Quarterly Report of RTRI, 46(1), 35-39, 2005. doi:10.2219/rtriqr.46.35 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £110 +P&P)
Back to top	©Civil-Comp Limited 2023 - terms & conditions