CSAIL team’s drones that fly and drive suggest another approach to developing flying cars.
Researchers from MIT’s Computer Science and Artificial Intelligence Laboratory (CSAIL) are aiming to develop robots that can both maneuver around on land and take to the skies. The team presented a system of eight quadcopter drones that can fly and drive through a city-like setting with parking spots, no-fly zones, and landing pads.
Being able to both walk and take flight is typical in nature, and many birds, insects, and other animals can do both. If we could program robots with similar versatility, it would open up many possibilities: Imagine machines that could fly into construction areas or disaster zones that aren’t near roads and then squeeze through tight spaces on the ground to transport objects or rescue people.
The problem: is that robots that are good at one mode of transportation are usually bad at another.
- Airborne drones are fast and agile, but generally have too limited of a battery life to travel for long distances.
- Ground vehicles, on the other hand, are more energy efficient, but slower and less mobile.
The ability to both fly and drive is useful in environments with a lot of barriers, since you can fly over ground obstacles and drive under overhead obstacles. Normal drones can't maneuver on the ground at all. A drone with wheels is much more mobile while having only a slight reduction in flying time.
How it works
The project builds on a previous prototype; developing a “flying monkey” robot that crawls, grasps, and flies and weighs in at less than 1/10th of a pound. While the monkey robot could hop over obstacles and crawl about, there was still no way for it to travel autonomously.
To address this, the team developed various “path-planning” algorithms aimed at ensuring that the drones don’t collide. To make them capable of driving, the team put two small motors with wheels on the bottom of each drone. In simulations, the robots could fly for 295 feet or drive for 826 feet, before their batteries ran out.
Adding the driving component to the drone slightly reduced its battery life, meaning that the maximum distance it could fly decreased 14% to about 300 feet. But since driving is still much more efficient than flying, the gain in efficiency from driving more than offsets the relatively small loss in efficiency in flying due to the extra weight.
- The team also tested the system using everyday materials such as pieces of fabric for roads and cardboard boxes for buildings.
- They tested 8 robots navigating from a starting point to an ending point on a collision-free path, and all were successful.
Building prototypes like these suggest another approach to creating safe and effective flying cars from years of research in adding driving capabilities to drones.
As they begin to develop planning and control algorithms for flying cars, the team is encouraged by the possibility of creating robots with these capabilities at small scale. While there are obviously still big challenges to scaling up to vehicles that could actually transport humans, it's inspiring for the potential of a future in which flying cars could offer us fast, traffic-free transportation.
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