Instrumentation & Measurement Magazine 24-4 - 72

Fig. 12. CPS system visual position measurement results in container loading.
fixed, we can use (1) to calculate the actual position data of vehicles.
For container trucks, an LED screen is installed on site to
notify position data to the truck driver (Fig. 13).
Security Control System: The objective of SCS is to detect the
occurrence of accidents. The accidents in RMG often occur
during the container lifting operation because this operation
involves the connection and movement of heavy equipment
such as containers, container spreaders, and container trucks.
In MCT, security control generally relies on on-site employees
to make decisions based on their observations and experience.
In SACT, employees can supervise operations from the remote
control room. However, this form of supervision is unreliable
as safety cannot be assured when the employee is fatigued. On
the contrary, SCS is an automated system that can monitor the
occurrence of accidents steadily and uninterruptedly, thus,
avoiding safety accidents caused by fatigue and distraction of
employees. SCS is similar to CPS, as it also uses target information
and geometric measurement data to determine whether
an accident has occurred. Next, two typical applications of SCS
are described.
Truck Anti-crush System: In the container loading and unloading
operations, if the truck's parking position deviates
Fig. 14. Recognition effect of the front anti-smashing system: 1) Truck head;
2) Truck frame.
significantly from the operation position, it is easy for the container
to squeeze the truck head. Usually, such accidents are
avoided by relying on the employee's observation, but ACT
could use automated equipment in this task to prevent accidents
in a more effective and stable manner. As illustrated in
Fig. 14, the truck anti-crushing system uses cameras to detect
the position of the truck's head and spreader. It compares these
two positions, and when the system detects that the spreader's
position coincides with the dangerous area (implying that the
spreader is above the truck head), it will send an accident signal
to the ACCS, which will in turn use the PLC to restrict the
drop of the spreader. This prevents the spreader from squeezing
the truck head.
Truck Lifting Prevention System: The geometric measurement
abilities of VBM system enable it to extract the posture of objects.
When the container is being unloaded from the truck, the
container lock pin needs to be opened first, and the truck can
leave only after the spreader unloads the container from the
truck. This is the normal container handling operation (Fig.
Fig. 13. Graphical user interface for container loading and unloading operation: (a) Operation terminal; (b) LED screen on the truck driver's side.
72
IEEE Instrumentation & Measurement Magazine
June 2021

Instrumentation & Measurement Magazine 24-4

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