WISAN-based Load Testing System allows establishing loading
profiles for various structures.
The Load Testing System employs high-precision wireless strains sensors in
conjunction with user-friendly software for network configuration, and collection and
processing of strain data.
Upon startup the user is presented with
a choice to load data from a hard drive
for review and analysis or to start a new
experiment (Figure 1).
The network setup tab contains an
indicator that displays the status of the
option is whether the strain sensor on
the sensor nodes needs to be powered
The experimental setup screen contains
parameters set for a given experiment
· Title and Description
· Structural geometry and location
of each sensor on the structure
· Calibration coefficients for each
· Sampling frequency and duration
of each data recording
· Selection of excitation voltage
applied to strain sensors
Experimental setup screen also allows
users to save and load experiments
setting, so for given sensor hardware
the calibration coefficients will need to
entered only once and loaded from disk
on subsequent uses.
Figure 1. Startup screen of the Load Testing System
Figure 2. Experimental Setup screen.
sensors and presents users
with a plethora of options
for establishing correctness
of acquired data:
associated with a certain
position on the structure
synchronously from all
wireless sensors allowing
utilization of strain data
in modal analysis
· The time series data display and a
histogram allow for visual control
over the data quality for each
sensor. Data statistics computes
variance, min and max values.
· Collected data can be either
accepted and saved on hard drive
as a data point for current
experiment, rejected or used to
adjust offset of the zero level
(offset drift is common in strain
sensors due to changes in ambient
Data processing screen
allows visualization of
collected data points and
visualization is possible
for a set of certain
sensors, load values, etc.
Report generation option
saves the data in HTML
editors such as Microsoft
Word or viewed in any
Internet browser (Figure
Figure 3. Data collection screen.
Figure 4. Data processing screen.
Figure 5. Beam setup and HTML report for load profile of an 8' aluminum
beam (no data point was taken in the middle location of the beam)