A Comparison of Automated Material Transport
From automated to autonomous: What’s the difference?
The words automated and autonomous are easily confused and often interchanged, but their meaning is inherently different.
Computer-controlled machines that can perform a set of defined tasks by following specific instructions with minimal or no human intervention.
Machines that have the intelligence to make decisions when faced with new or unexpected situations. These machines may have the ability to learn as they encounter new situations.
AGV vs SDV
Automated Guided Vehicles (AGVs) and Self-Driving Vehicles (SDVs) are also often confused. Each system operates with fundamentally different technology, from perception and navigation software to onboard sensors. Therefore, they have different capabilities and potential applications.
Automated Guided Vehicle (AGV):
An AGV is an unmanned electric vehicle that is controlled by pre-programmed software to move materials around a facility. AGVs1 rely on guidance devices such as magnetic tape, beacons, barcodes or predefined laser paths that allow the AGV to travel on fixed paths in a controlled space. Lasers and sensors detect obstacles in its path and trigger the vehicle to stop automatically2.
Self-Driving Vehicle (SDV):
An SDV is a vehicle in which operation occurs without direct driver input or pre-configured scripts to control the steering, acceleration, and braking.3 Within an industrial environment, an SDV utilizes laser-based perception and navigation algorithms to dynamically move through facilities, infrastructure-free. Machine learning capabilities enable the vehicle to become more efficient and accurate as it encounters new situations.
The SDV: An evolution of the AGV
Automated material transport has experienced an evolution due to rapid advancement in sensors and big data capability. Autonomous next-generation solutions are disrupting conventional AGV technologies with 5 core advantages:
1. FLEXIBLE AND VERSATILE
AGVs are fixed. They follow predefined paths using lasers, beacons, barcodes or magnetic tape.
- Multiple AGV units are required for different applications.
- Ongoing infrastructure maintenance is required.
- Minor debris in the laser’s field of view prevents the vehicle from moving until the obstacle is manually removed by human personnel.
SDVs do not require external infrastructure for navigation, making implementation hassle-free and highly scalable.
- One SDV unit can be used in multiple applications
- Encourages 5S standards for clean aisleways throughout the entire facility.
- SDVs detect, avoid, and dynamically move around obstacles to continue to the destination, reducing downtime. Human interaction is not required.
- Parameters can be customized to navigate through aisleways, personnel zones, and narrow corridors.
2. EASILY SCALABLE
AGVs can be added to the facility if the layout adheres to AGV infrastructure requirements.
- Resources are required for facility planning, infrastructure innovations, maintenance, and line training.
- The facility layout must be designed to accommodate equipment.
Additional SDVs can be operational in <1 day as they operate from a centrally controlled map, shared among the fleet.
- Infrastructure renovations, facility planning, or additional training are not required.
- SDV customers do not need to outsource work to 3rd party vendors for changes or additional implementation.
Moving an AGV is equivalent to installing an AGV system for the first time – significant resources are required.
- The infrastructure is fixed. Changes are rigid and costly.
- Multiple systems are required in total, despite low/high seasonal periods.
SDV can be redeployed from one plant to another, or to a different zone within the same plant. With a centrally controlled fleet manager, setup time is minimal and can be completed by the customer.
- Units can be shared among multiple facilities to alleviate seasonal demands.
- Throughput is increased in facilities or zones, that would otherwise be
underutilized assets from other facilities or zones that experience a downturn.
- SDVs can become a shared resource; therefore, fewer units are required for purchase.
AGVs are not intelligent machines and do not facilitate the industry’s vision of the ‘smart factory’4. Due to infrastructure, intelligence is not required.
- Due to the lack of data collection, plant operators do not have insight into real-time KPIs or vehicle performance.
- Standard stack lights and sounds are unchanging, despite changes in the environment.
- AGVs are unable to back up or take alternate routes.
- AGVs cannot easily integrate with other solutions.
Onboard intelligence enables SDVs to adapt to changing environments and easily integrate with other solutions (including ERPs). Machine learning collects data and updates the fleet’s shared map with learned parameters.
- SDVs learn which routes are the fastest and take optimal paths, even within unpredictable environments.
- Plant personnel can safely and collaboratively interact with SDVs.
- SDVs offer integrated lights and sounds that resemble outdoor automobiles to intuitively indicate behaviors to plant personnel.
AGVs are designed to do simple tasks, yet setup and operation are cumbersome, complex, and costly.
- AGVs require trained expertise by certified personnel or engineers
- Changes to the system require facility infrastructure updates and additional staff training.
Implementation includes mapping facility once with a vehicle then setting up zones and points of interest on the map in the fleet manager.
- The system is set up by the customer and is done so with a point and click interface
- Updates to vehicle or access zones can be made by plant personnel
- Changes in production lines or distribution layouts are easily implemented.
1 Modern Materials Handling, “Automation: What is an AGV,” June 2011. http://www.mmh.com/article/aut…
2Modern Materials Handling, “Casters, Carts, and Tuggers: Reinventing the Wheel,” June 2016. http://www.mmh.com/article/cas…
3Wall Street Journal, “Tesla CEO Musk Sees Fully Autonomous Car Ready in Five or Six Years,” http://www.wsj.com/articles/te…
4Industry Week. “The Dawn of the Smart Factory” http://www.industryweek.com/tech…