Reciprocating piston compressors have been used in compressed air production up to 10 bar on rail vehicles because of their advantages concerning sturdiness of construction, high availability, easy maintenance and low Life Cycle Cost compared with rotary compressors. A special advantage of the oil-free compression consists in the reduction of measures for the air treatment and in its environmental benefits. Unfavourable for application in rail vehicles, especially in modern high-speed trains, are the forces and moments of inertia obtained during operation. The compressors vibrational behaviour must be optimised and adapted to suit the vehicle. New developments of an oil-free piston compressor thus require a comprehensive calculation model which would allow to conclude the use of appropriate compressor geometries that involve an optimum vibrational behaviour. The vibration system of the motor compressor unit was modelled. The vector of excitation was determined for arbitrary compressor designs. Thereby allowing a vibration calculation to be modelled in connection with an FE model of the rail car body structure. Calculation results of different two stage piston compressor types were compared. Based on these results, for the first time a gas force optimised two stage piston compressor for railway application was developed. An arrangement of the elastic suspension was developed, adapted to the compressor type, taking into consideration the direction of the excitation. By the application of oil free technology, the optimal horizontal piston arrangement parallel to the vehicle floor was apparent.
Oil-free low-vibration piston compressor in railway applications
Ölfreier, schwingungsarmer Kolbenverdichter zur Anwendung in Schienenfahrzeugen
2001
12 Seiten, 11 Bilder, 5 Quellen
Aufsatz (Konferenz)
Englisch
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