Feeds

MIT takes battery-powered robot cheetah for a gallop

Biomimetic big cat needs no power cord, just a walker

Secure remote control for conventional and virtual desktops

Video Fast, agile robots for reconnaissance and rescue have been under development for half a decade or more, but they all have needed to be tethered to a power cable. Now MIT thinks it has cut the leash with a battery powered "cheetah" capable of outrunning a human.

The design, showed off at the International Conference on Robotics and Automation this month, borrows heavily in design from the animal kingdom. It's about the same size and weight as a regular cheetah, uses Kevlar tendons on its legs to make them 60 per cent more efficient, and has a spine controlled by the movement of the robot's legs.

Alternative running robot designs, such as the DARPA-funded Boston Dynamics cheetah, use hydraulics to power strides, but MIT decided that these were too heavy, and so developed a "three phase permanent magnet synchronous motor". This is more power-efficient and torquey than commercial electric systems, and uses regenerative motors to reuse power in a way similar to that used by hybrid cars.

The scientists say this design gives MIT's cheetah a cost of transport (COT) ratio (defined as power consumption divided by weight times velocity) of 0.52, which is about the ratio of a flesh-and-blood cat. By comparison Honda's Asimo robot has a COT of 2 and Boston Dynamics's petrol-powered Big Dog robot pack animal has a COT of 15.

This conservation of power means that the new design won't need an electrical cable to operate, and instead will use four 22.2-V lithium polymer batteries to maintain a pace of 5.2 mph (8.3 kph) for 1.23 hours, IEEE Spectrum reports, giving it a range of 6.2 miles (10km).

There's a cost for this design in terms of speed however – Boston Dynamics's machine can run at 28.3 mph (45.5kph) but MIT's effort can only manage 13.7 mph (22 kph). While that's only half as fast, it's still good enough to outpace most humans over its range.

Before you start having nightmares about being hunted down by robots, there's still work to be done. While MIT's robot is power-independent there's still a lot more to be done in terms of balancing itself in three dimensions – in testing, the robot has to be strung up in a walking frame in case it topples over.

There's also going to be extra power issues to sort out before the MIT cheetah becomes viable. A military robot in the field will need some kind of camera and communications system to relay data back to base, and if it's weaponized that will mean more weight.

In El Reg's opinion the designer should just stick a pair of titanium teeth on the robot and let it run – it would be enough to scare most soldiers back into their foxholes if a horde of these cheetahs sprinted towards them. ®

Top 5 reasons to deploy VMware with Tegile

Whitepapers

Driving business with continuous operational intelligence
Introducing an innovative approach offered by ExtraHop for producing continuous operational intelligence.
Why CIOs should rethink endpoint data protection in the age of mobility
Assessing trends in data protection, specifically with respect to mobile devices, BYOD, and remote employees.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Protecting against web application threats using SSL
SSL encryption can protect server‐to‐server communications, client devices, cloud resources, and other endpoints in order to help prevent the risk of data loss and losing customer trust.