Russian Researchers Build a Six-Legged Robot for Tough Terrain
Penza State University (PSU) has unveiled a prototype autonomous hexapod robot designed to find people in hard-to-reach locations and inspect oil and gas pipelines.
Six legs arranged radially around the robot's body help it stay upright on uneven ground. While some legs maintain contact with the surface, others step over rocks, holes, and debris that could trap wheeled or tracked vehicles. The prototype weighs 5.5 kilograms (about 12.1 pounds), and its main components are made using 3D printing. It can operate for around six hours on a single charge.
Sensors in Its Feet, a Navigator in Its Brain
The most interesting part of the new robot isn't its legs – it's the “brain” behind them. The hexapod can make decisions on its own, right where it is, without an internet connection or communication with a remote operator. Its control system has three levels that work together like a coordinated team. The first, the “strategist,” chooses a route. The second, the “navigator,” surveys the surroundings and assesses conditions. The third, the “motor” level, controls the legs and keeps the body from tipping over.
To “see” its surroundings, the robot combines data from cameras, GPS, inertial sensors, ultrasonic rangefinders, and a 3D lidar system that uses laser pulses to measure distances of up to 30 meters. Sensors in the legs themselves detect when a foot touches the ground and whether it starts to slip. All this information flows to the onboard computer, which determines the robot's next move. No cloud services are involved: all processing takes place onboard. That matters in places where communications can fail, such as basements, pipelines, and accident sites. In the future, robots like this could go where it is too dangerous for people – searching for survivors in earthquake-damaged buildings, exploring otherwise inaccessible locations, or inspecting pipes for corrosion.
Robots on the Job
Russia's robotics market is growing. Last year, it was worth 30 billion rubles (about $360 million). By 2030, its value is expected to exceed 210 billion rubles (about $2.5 billion). The number of robots in operation is projected to rise from 27,000 to 98,000. These robotic “workers” are being developed for some of industry's most dangerous jobs, including pipeline inspections and rescue operations.
For example, researchers at Peter the Great St. Petersburg Polytechnic University recently unveiled a system for inspecting main gas pipelines. It can travel up to 60 kilometers inside pipes with a diameter of 1,400 millimeters (about 55 inches) and operate at temperatures as low as -40°C (-40°F). The first unit is already undergoing pilot industrial operation, with deployment planned for 2027.
Tomsk Polytechnic University has also presented a robot designed to inspect utility systems at nuclear facilities. It can examine internal radioactive contamination and wear in pipelines ranging from 450 to 1,500 millimeters (about 18 to 59 inches) in diameter. Its adaptive mobility system, built around a universal chassis, allows it to travel through cylindrical pipes as well as flat ducts and ventilation systems. It can also carry a dosimeter, a gamma spectrometer, and other modules.
The Rusnano Group has developed TUBOT inspection robots for year-round diagnostics of pipes measuring 190 to 530 millimeters (about 7.5 to 21 inches) in diameter. They can carry loads of up to one metric ton (about 2,205 pounds) and operate in explosive atmospheres. They can navigate vertical sections, bends of up to 180 degrees, T-junctions, and branch lines. Their potential applications span the oil and gas, nuclear, and chemical industries, as well as power generation and housing and utilities. The lineup includes wheeled and tracked versions, with four size configurations.
The Penza researchers' design stands out by combining a six-legged configuration, autonomous navigation, and a platform that can be adapted to different operating scenarios.
A Small Hexapod With Big Potential
Russia's robotics market is gaining autonomous machines capable of navigating complex environments on their own.
For PSU's prototype to move from the lab to an industrial-ready machine, however, several challenges remain. These include increasing the height of obstacles it can overcome – currently no more than 10 centimeters (about 4 inches) – and improving its stability on difficult surfaces. The team will also need to demonstrate that its autonomous navigation works without satellite signals, equip the platform with reliable wireless communications, and test the electronics against moisture, dust, impacts, and temperature fluctuations. Other priorities include establishing the maximum payload and how long the robot can operate while carrying diagnostic equipment, as well as ensuring safe use in oil and gas environments in compliance with explosion-protection requirements.
In the future, robots like this could help emergency crews survey areas after natural disasters, locate survivors, and gather information about hazardous conditions before the rescue team arrives. They could also make municipal utility and energy infrastructure more reliable.
