Abstract
Background: Active lateral suspension (ALS) technologies have been well developed for several decades, but they have not been widely used in service operation due to relatively high costs for implementation and maintenance and concerns about fail-safe. Therefore, this paper suggests a more practical approach for the active suspension system, designed to achieve target performance with easy implementation and maintenance and high fail-safe. Methods: The control performance target and actuator type are determined from the vibration energy that the ALS has to absorb along the weight function for ride quality evaluation. The installation position of actuator and sensor is decided to decrease the time that it takes for field engineers to check the actuator for maintenance. In addition to fail-safe function of ALS system, conventional hydraulic lateral damper is installed in parallel with ALS to reduce the concern about fail-safe of the ALS. Results: Through the roller rig and filed tests, the performance of the proposed ALS was validated. Lateral ride quality was improved 7.1dB and 6.7dB in the roller rig test and field test, respectively. The fail-safe strategy was also verified during the filed test. Conclusion: Test results show that the suggested ALS is designed appropriately and can be used in practical implementation.
Highlights
As railway demands have increased and rail networks have expanded, railway operators face the difficulty of high maintenance costs
Active suspension systems have been developed as an alternative measure, and some semiactive and full-active secondary suspension systems have been implemented in Europe[1,2] and Japan.[3,4]
Even though Active lateral suspension (ALS) technologies have been well studied for several decades and commercialized in certain countries, they have not been widely used in service operation due to relatively high costs for implementation and maintenance and concerns about fail-safe
Summary
As railway demands have increased and rail networks have expanded, railway operators face the difficulty of high maintenance costs. Requirements placed on railway vehicle manufacturers for riding comfort, running safety, and operating speed are continuously increasing, even though track conditions are getting worse. The concept was already introduced in the 1990s;5 it was only recently commercialized for use in tilting systems.[2] Active lateral and vertical suspensions have been developed to reduce the acceleration transferred from track irregularities up to the carbody. Even though ALS technologies have been well studied for several decades and commercialized in certain countries, they have not been widely used in service operation due to relatively high costs for implementation and maintenance and concerns about fail-safe. A more practical approach for ALS system design is required in order to attract railway operators. This paper suggests a practical approach for ALS systems for easy implementation and maintenance with high fail-safe. Test results in the laboratory and on tracks show the suggested ALS system can be applied to conventional bogies with minor changes in their original design
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