Tunnel vibration measurement

1.Attended Samples (short-term measurements)

The detailed evaluation of the potential effects of railway vibration are usually assessed by taking sample measurements at a number of locations and examining the results in detail. The VM-56 directly measures the parameters for evaluating human response. Using the VM-56 with the VX-56RT third octave and/or the VX-56WR waveform recording options provides the data necessary to evaluate mitigation requirements and/or potential groundborne noise issues.
The VM-56 is ideally suited to attended measurements. It is easy and intuitive to use.
The bright, backlit display is easy to read in all lighting conditions.
The unit is lightweight and portable with sufficient battery life, from the internal AA cells, for a full day’s monitoring. Practical accessories, such as ground and wall mounting plates are available.
The VM-56 stores the measurement results as a CSV file onto a memory card which can be opened directly into a spreadsheet program making the task of reporting very quick and easy.
The Waveform Recording Program VX-56WR and Waveform Analysis Software can be used if more detailed analysis is required.

2.Unattended Long-Term Measurements

Carrying out continuous long-term measurements is a good way of evaluating the overall vibration environment at a receptor or on a proposed development site.
The VM-56 is ideally suited to this task because it can store up to 200 days’ data as a CSV file onto and SD card. The VM-56 can be externally powered and the instrument and sensor are weather resistant (senor IPX7 and instrument IP54). Practical accessories, such as ground and wall mounting plates are available. The CSV data from the SD card can be opened directly into a spreadsheet program and an Excel macro is supplied free of charge to facilitate report creation.

3.Long-Term Live-to-Web Monitoring

In urban areas, much of the railway infrastructure is underground. As new tunnels are built and existing tunnels upgraded, the schemes are often required to achieve and maintain vibration and groundborne noise levels within stringent limits. Noise and vibration generated by tunnels is a function of wheel and rail roughness and a maintenance regime is required to ensure that levels do not rise to an unacceptable level. Live-to-web monitoring of vibration levels can be used to evaluate whether the required levels are being attained. The results can also be shared with regulatory bodies to provide reassurance that standards are being maintained.
The two-way communications interface and reliability of the VM-56 make it ideally suited to integration into an online system. Using the RION VM-56 also ensures that the quality of the data is excellent.
Please contact us for more details regarding system configuration.