Deutsche Bahn AG


Determining Fatigue Behavior


Rolling stock is the most safest means of transportation. This is ensured by advanced track examination systems and high quality of wearing parts of wagons and power cars. The Minden based research and development center of Deutsche Bahn AG examines bogie frames, wheels, springs, and couplings. Recording data is achieved with the TEAC data recorder RD-200T.


The RD-200T in Operation


Testing sequences are set in a way that in relatively short periods of time a long period of operation can be simulated on the test stands. Within only three months it can be approved if the specimen is able to be run over 30 years permanent operation. To detect the smallest mechanical tensions or deformations the measurement engineers use strain gages. The TEAC data recorder digitizes the preamplified signals of the strain gages and makes it available to the measurement engineer for examination.


Operation in a Rolling Train


DB staff member Hans-Dieter Junggebauer is responsible for specifications, structure of testing programs and data acquisition. He uses the TEAC recorder not only in the Minden test center but also in rolling trains where parallel measurements at different wearing parts are made. Any of the 16 recording channels of the RD-200T are used. Junggebauer especially likes the integrated microphone and the additionally available sound track which allows him to save comments about the course of the test.


Fast Searching


Back in the laboratory the interesting parts of the tape are replayed and the respective values are analyzed. Junggebauer benefits of the numerous search modes which are supported further by ID numbers. During test rides used tapes are searched through according time oriented criteria: "Search 8pm" (sign passing bridge). If the TEAC 200T has found the respective position of the tape it outputs an acoustical signal.


Long Time Recording


The RD-200T offers up to two hours of recording time. Because Junggebauer uses the long play option he has available a recording time of up to twelve hours. The measurement technician is enthusiastic because of the high sample rates of the unit. If all 16 channels are in use 2.5 kHz bandwidth are available. This allows recording six signals or pulses within a millisecond. A perfect solution for the data acquisition in rolling trains or on the test stand of the research and test center of Deutsche Bahn AG.