05-07-2012, 03:34 PM
AUTOMATED GUIDED VEHICLE SYSTEMS
AUTOMATED GUIDED .pptx (Size: 445.21 KB / Downloads: 71)
Introduction
An automated guided vehicle or automatic guided vehicle (AGV) is a mobile robot that follows markers or wires in the floor, or uses vision or lasers.
They are most often used in industrial applications to move materials around a manufacturing facility or a warehouse.
In short it’s an independently operated, self-propelled vehicles guided along defined pathways.
Some basic facts:
An AGV can also be called a laser guided vehicle (LGV) or self-guided vehicle (SGV).
The first AGV was brought to market in the 1950s, by Barrett Electronics of Northbrook, Illinois, and at the time it was simply a tow truck that followed a wire in the floor instead of a rail
In the late 20th century AGVs took on new roles as ports began turning to this technology to move ISO shipping containers.
Over the years the technology has become more sophisticated and today automated vehicles are mainly Laser navigated e.g. LGV (Laser Guided Vehicle)
WIRED TYPE
The wired sensor is placed on the bottom of the robot and is placed facing the ground.
A slot is cut in the ground and a wire is placed approximately 1 inch below the ground.
The sensor detects the radio frequency being transmitted from the wire and follows it
Natural Features Navigation
Navigation without retrofitting of the workspace is called Natural Features Navigation.
One method uses one or more range-finding sensors, such as a laser range-finder, as well as gyroscopes and/or inertial measurement units with localization techniques to understand where it is as it dynamically plans the shortest permitted path to its goal.
The advantage of such systems is that they are highly flexible for on-demand delivery to any location.
They also are quick to install, with less down-time for the factory
Frequency select mode
Frequency select mode bases its decision on the frequencies being emitted from the floor.
When an AGV approaches a point on the wire which splits the AGV detects the two frequencies and through a table stored in its memory decides on the best path.
The different frequencies are required only at the decision point for the AGV. The frequencies can change back to one set signal after this point