Germany Develops Autonomous Drone to Rapidly Detect Cracks in Concrete Bridges

Flying Bridge Inspector

According to НВ — Техно: Researchers in Germany have created a compact autonomous drone designed to identify dangerous cracks within concrete bridges. This innovative device employs artificial intelligence to spot even the smallest fractures inside concrete structures, streamlining inspections by making them faster, safer, and more cost-effective. Developed at Ruhr University Bochum, the drone is capable of navigating confined and dimly lit sections of bridges to carry out detailed examinations.

Equipped with simultaneous localization and mapping (SLAM) technology, the drone efficiently plans its flight paths during inspections. All collected data are stored on an SD card, facilitating thorough post-flight analysis. Currently undergoing laboratory testing at the university’s Center for Intelligent Product and Service Systems (ZESS), the system is slated for real-world trials on an actual bridge. Creators David Müller and Raphael Dirschka emphasize that

"our drone can make inspections safer, quicker, and more accessible."

Addressing Aging Infrastructure Challenges

Many German bridges constructed between the 1960s and 1980s require frequent evaluations due to aging and environmental wear. Exposure to extreme temperatures and weather conditions often damages concrete surfaces. Patrick Gerbers notes that

"inspectors typically work on-site using tablets and cameras, a method that is demanding and prone to human error."

While the drone does not replace human inspectors, it gathers crucial data for experts to analyze.

Meanwhile, innovation in drone technology is also emerging in Denmark. Students at Aalborg University have developed a hybrid drone capable of both flying and swimming, created using 3D printing. It features adjustable-angle propellers allowing it to maneuver in air and water alike. This variety of drone technologies highlights the rapid advancement of automation and infrastructure safety solutions. Marcel Neuhausen states, "we aim to prove that our drone performs effectively not just in labs but in real-world environments."

Advancing drone technology for bridge inspections represents a significant stride toward enhancing infrastructure safety, especially as many structures age. These innovations reduce risks for inspectors and improve the accuracy of detecting structural faults, potentially preventing serious accidents. The projects at Aalborg University demonstrate ongoing progress in automation and safety technologies, underscoring the importance of collaboration between research institutions and industry to implement practical, effective solutions in infrastructure monitoring and maintenance.