Railway noise monitoring acramos®: Continuous monitoring of acoustic emissions

The automatic measuring system acramos® can perform extensive statistical research and analysis in the railway sector. In addition to noise monitoring (during operation, IBE-Nois/TAC-Track Access Chargee), manufacturers of sound protection measures can be supported in the development and optimization of new products. With acramos® it is possible to automatically determine the category of train and assign the level of passing cars exactly to the axis. The ÖBB already operate two of such noise monitoring systems, which are installed close to Deutsch-Wagram and in Breitenstein am Semmering.

Further information about the measuring system acramos® can be found at www.acramos.at

acramos® features:

The acramos® system provides for each train passing the following data, which is stored in a MS-Access database and available for further analysis:

• Direction and speed profile of the train
• Axle pattern of the train (=distances between the individual axles)
• Automatic categorization of trains using the axis pattern
• A-weighted pass-by level Lp, A, eq, T of the train
• Meteorological data at train passing
• Values are stored in a database: Statistical analysis, A-weighted level of passing cars per train category
• Third octave level spectrum of the train (airborne sound)
• Optional: A-level statistics Lp, A, 01, Lp, A, 10, Lp, A, 90, Lp, A, 95 of the train
• Optional: A-weighted pass-by level Lp, A, eq, WG of each car on the train
• Optional: A-weighted pass-by level Lp, A, eq, AX each axle on the train
• Recording of the time signal of the passing train. With this "original situation", it is possible to further analyze at a later point of time.

Access to the measuring system acramos® is possible via remote connection. Therefore, results can be viewed just seconds after the test drive or even sent via e-mail. Furthermore, this feature allows to check the current operating state of the measurement system around the clock.

→ Selected references of the automatic railway noise monitoring system acramos®

→ More information about acramos®

• Our experiences:

Using the monitoring system acramos® we have already carried out a number of studies:

• Measurement of high-speed rides on the NBS Tullnerfeld during the innovation test drives
• Investigation of the acoustical effects of rail web absorbers
• Investigation of the acoustical effects of railhead conditioners

• Our services:

Based on the results obtained by acramos the acoustic effect can be checked and optimized noise protection measures. Due to the high number of measured traits (statistical significance) the acoustic effect of the respective system can be detected with sufficient accuracy.