BBOX 2.0 — Monitoring

SHM, Event-Based Monitoring and project-specific configurations

Structural health over time, seismic event response, project-specific multi-sensor integration. Two modes in the base configuration, a third when the project requires it.

Structural Health MonitoringEvent-Based MonitoringProject-specific configurations
01 — Base configuration

Structural Health Monitoring

Observing structural behaviour over time, detecting variations in dynamic characteristics, and identifying early signs of degradation. SHM relies on Operational Modal Analysis (OMA): accelerometer signals are processed to extract the structure's dynamic parameters under ambient excitation, without artificial forcing.

Natural frequencies
The frequencies at which the structure tends to resonate, governed by stiffness and mass distribution. A shift over time indicates a structural change.
Mode shapes
The deformed configuration associated with each natural frequency. It describes how the structure deforms when vibrating at that frequency.
Damping ratios
The structure's capacity to dissipate vibrational energy. Significant variations may indicate changes in material properties or connection conditions.

Longitudinal comparison against the modal baseline enables detection of significant variations over time. The system simultaneously acquires thermal data to separate reversible environmental effects from structurally significant changes.

Operating mode
Time-based
Recording schedule
Remotely configurable
Typical sampling rate
62.5 – 250 Hz
02 — Base configuration

Event-Based Monitoring

Records the structural response during an event and provides the objective basis for post-event assessments. The primary reference is seismic loading, but the same approach applies to impacts, extreme wind, floods, and any extraordinary dynamic action.

PGA / PFA
Peak accelerations
At ground level (PGA) and floor levels (PFA). Directly comparable with the structure's design accelerations.
δ
Displacements
Derived by numerical integration of the accelerometric signal. They describe the actual deformations during the event.
Δ/h
Inter-storey drift
A code-defined damage indicator. Comparison against the design drift limits (per EC8 / NTC) provides a quantitative picture of the post-event condition.
Pre-trigger
Continuous acquisition
The seconds preceding the peak are always included in the recording.
Trigger
Threshold exceeded
Recording starts automatically. Independent threshold per sensor.
Post-trigger
Free decay response
Recording continues after the event, capturing the free vibration decay.
UPS
Uninterrupted operation
The system remains operational even in case of blackout during the event.
MOSI service
On request, MOSI can issue a technical report supporting the post-earthquake structural safety assessment.
Operating mode
Threshold-based
Trigger
Pre and post · independent per sensor · remotely configurable
Sampling rate
Up to 1,000 Hz
03 — System expansion

Project-specific configurations

Through ESA expansion units, the BBOX 2.0 Datalogger integrates sensor types beyond accelerometers. A single Datalogger manages the entire array, keeping data acquisition, transmission, and access fully centralised.

Strain gauges
Local deformations of beams, columns, and slabs.
Crack meters and displacement transducers
Crack opening and relative displacements between parts of the structure.
Advanced inclinometers
High-precision static inclination measurement.
IEPE accelerometers
For specific frequency bands or interfaces.
Temperature and humidity
Environmental correlation essential in SHM.
Hydrometers and environmental
Hydrogeological risk and variable climatic conditions.
Expansion interface
ESA units · 4–20 mA signal
Sensors per ESA unit
Up to 6 (a single Datalogger supports up to 6 ESA units)
Management
Centralised on a single Datalogger

SHM and Event-Based monitoring in the base configuration. Project-specific configurations when the project requires them.

Both operating modes are available with no additional components, with remotely configurable parameters. Expansion with different sensor types is activated when the required information goes beyond accelerometry.

Technical consultation

Which configuration suits your structure?

MOSI supports the definition of the most appropriate technical configuration, based on the structure, the monitoring objectives, and the operational context.

Request a technical consultation