Robotics in Sub-Zero Temperatures Four-Legged Robot With Polar Bear Paws for an Arctic Mission

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Deep Robotics is sending a modified four-legged robot to the Arctic. Instead of wheels, the system uses bionic paws to move safely across fragile ice floes. The technology is designed to facilitate dangerous research expeditions.

The Chinese manufacturer Deep Roboticshas sent a specially adapted version of its four-legged Lynx S10 robot on an expedition to the Arctic. The goal of the mission, in which the approximately 44 pounds system was deployed onto ice floes from a research vessel, was to test its mobility and reliability under extreme climatic conditions. In its standard configuration, the Lynx S10 is designed as a wheel-leg hybrid. This design typically allows the machine to conserve energy by rolling on flat terrain and to switch to a running mode in rough terrain.

However, the conventional wheel design proved inadequate for the harsh environment of the Arctic Ocean. Wheels find it difficult to gain traction on smooth, wet ice or in deep snow and quickly sink under load. To ensure mobility in the polar region, the engineers therefore fundamentally modified the robot. The most striking and important change concerns the locomotion elements: The developers replaced the conventional wheel modules at the ends of the four legs with large, biomimetic paws. These are modeled after the morphology of polar bear paws. The design distributes the robot’s weight over a significantly larger surface area, effectively preventing the machine from sinking into soft snow or breaking through thin ice crusts.

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Swimming Aids And Higher Protection Rating

To ensure the necessary grip on hard, slippery ice, the designers equipped the robotic legs with a non-slip surface texture and integrated claws that function similarly to crampons. In addition, the team increased the surface area of the leg sections. This allows them to function as paddles when necessary, should the robot need to move through areas of mixed ice and water. To ensure the machine’s buoyancy when wading through deep puddles of meltwater, air-filled buoyancy chambers were additionally attached to the upper limbs.

In addition to the mechanical design, the manufacturer also adapted the hardware’s durability to the extreme environmental conditions. While the standard versions of the robot are protected against dust and water jets to IP54 or IP66, depending on the model, the developers upgraded the sealing of the Arctic prototype to protection class IP67. The housing is thus protected against moisture ingress even if temporarily submerged in icy water. Since the standard operating range of the Lynx S10 typically ends at minus 4 degrees Fahrenheit, the team also integrated special insulation and cold-weather protection components. These protect the electronics and batteries from malfunctioning due to extreme sub-zero temperatures.

Autonomous Navigation in Drift Ice

Navigation across unpredictable and sometimes treacherous terrain is largely autonomous. The robot relies on AI-based motion control. This system was further developed in collaboration with Sun Yat-sen University, Westlake University, and Hangzhou Dianzi University to optimize the paw geometry and control algorithms for ice. A special algorithm continuously analyzes the ground conditions and selects the appropriate gait. The spectrum ranges from cautious probing on brittle ice to powerful wading through slush.

The Lynx S10 uses several systems for navigation in the wilderness:

• four HDR ultra-wide-angle cameras for high-contrast images that enable precise obstacle detection
• Front and rear lidar sensors for real-time 3D mapping of the surroundings
• a tilt function to view the terrain from a higher vantage point when necessary

During tests on Arctic drift ice, the system demonstrated its ability to navigate unstable surfaces and areas of mixed ice and water. The robot’s legs and claws kept it stable on slippery ground. In one instance, the machine glided over seemingly solid terrain that concealed a water hole covered by snow without losing its balance. According to reports, while the robot moved at a significantly reduced speed in particularly challenging sections, it never lost its stability. It should be noted, however, that independent third-party verification of specific performance data is currently limited.

Deep Robotics emphasizes that the modified Lynx S10 is currently still in the alpha stage and is not a finished production model. The insights and data gathered from this expedition will be directly incorporated into the production development process. The stated goal is to create a reliable tool for scientific expeditions or rescue missions that can be used to explore inhospitable, remote, or dangerous areas without exposing people to unnecessary risks. (mc)

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