In industrial production and special operations, complex environments often present multiple challenges, including high temperature, high pressure, vibration, and electromagnetic interference, making it difficult for traditional sensing devices to reliably capture environmental information. Six-dimensional force sensors, with their high-precision measurement capabilities of three-dimensional forces (Fx, Fy, Fz) and three-dimensional torques (Mx, My, Mz), have become "reliable sensing nodes" in complex environments. They play an irreplaceable role in extreme condition monitoring, unstructured environment operations, and multi-device collaboration, providing crucial data support for equipment safety and operational accuracy.
I. Equipment Condition Monitoring under Extreme Operating Conditions
In extreme environments such as high temperature, high pressure, and strong radiation, subtle changes in the force value of equipment are often important early warning signals of faults. The six-dimensional force sensor can maintain stable performance under harsh conditions and capture the mechanical characteristics of equipment operation in real time.
In the monitoring of reactor cooling pump operation in nuclear power plants, sensors must withstand temperatures up to 150°C and strong gamma-ray radiation. Installed at the connection between the pump body and the base, it monitors fluctuations in radial force (Fx, Fy) and axial force (Fz) in real time. When impeller wear occurs inside the pump, the radial force deviation can exceed 50N. The sensor transmits the data to the control system, issuing a fault warning 1-2 weeks in advance to avoid nuclear safety risks caused by sudden pump shutdown. After introducing this technology, one nuclear power plant reduced the number of unplanned shutdowns of the cooling pump from 2-3 times per year to zero, and maintenance costs decreased by 40%.
Monitoring deep-sea oil and gas extraction equipment further highlights the pressure resistance of sensors. On the robotic arm of a drilling platform at a depth of 1000 meters in the ocean, sensors must withstand water pressure of 10 MPa while simultaneously sensing the torque (Mz) and axial force (Fz) of the drilling string. When the string gets stuck, the torque can instantly increase to over 1000 N·m. The sensor provides data feedback within 50 ms, driving the robotic arm to adjust the direction of force to prevent the string from breaking. This real-time force control reduces the accident rate in deep-sea drilling by 60% and increases the extraction efficiency of a single well by 25%.
In the metallurgical industry, continuous casting machine roller conveyor monitoring relies on the dust and high-temperature resistance of sensors. Sensors are installed at the roller conveyor bearing housings to monitor the radial force (Fx) and rotational torque (Mz) of the rollers. When surface nodules on the roller conveyor cause force fluctuations exceeding 30%, the system automatically alarms and adjusts the roller pressure to prevent scratches on the cast billet surface. Application data from a steel company shows that this technology increased the billet qualification rate from 95% to 99.2%, reducing scrap losses by over 8 million yuan annually.
II. Job Guidance in Unstructured Environments
In unstructured environments such as building ruins, jungles, and deserts, equipment cannot operate based on preset programs. The six-dimensional force sensor provides real-time operation guidance for the robot by sensing the reaction force of the environment.
In earthquake rubble rescue operations, the robotic arms of search and rescue robots are equipped with six-dimensional force sensors. These sensors detect the hardness of objects under the rubble through pressure along the Fz direction—the force spikes when contacting concrete (>50N), while the force level decreases (<10N) when encountering soft tissue. The robot adjusts its digging force accordingly to avoid secondary injuries to survivors. Simultaneously, changes in the Mx and My torques reflect the contact angle between the robotic arm and obstacles, aiding in obstacle avoidance path planning and improving search and rescue efficiency by 30%.
When agricultural harvesting robots operate in orchards, sensors play a more flexible role. When the robotic arm grasps a fruit, the lateral forces in the Fx and Fy directions can sense the connection strength between the fruit and the branch. If the force value is less than 2N, it means the fruit is ripe and can be picked directly; if the force value is greater than 5N, the fruit stem must be cut first. This force-sensing judgment reduces the fruit breakage rate from 15% to 3% during harvesting, while also avoiding the accidental picking of unripe fruit.
In post-blasting debris removal operations at mines, sensors help robotic arms adapt to complex terrain. By monitoring the three-dimensional force distribution in the bucket, the looseness of the debris is determined—a uniform force value (Fz) indicates loose debris that can be loaded quickly; a sudden increase in local force value (>1000N) indicates the presence of large rocks, requiring prior crushing before further work. This dynamic adjustment improves debris removal efficiency by 20% and reduces bucket wear by 15%.
III. Force Balance Control for Multi-Equipment Collaborative Operation
In collaborative operation scenarios of large-scale engineering equipment, the force balance of each piece of equipment directly affects the safety and accuracy of the operation. The six-dimensional force sensor realizes the coordinated force exertion of multiple pieces of equipment through distributed force value monitoring.
In bridge hoisting construction, multiple cranes work together to lift beams weighing up to 100 tons. Each crane's hook is equipped with a six-dimensional force sensor. The system compares the Fz axial force values of each sensor in real time. When the force deviation of a crane exceeds 5%, its lifting speed is automatically adjusted to ensure the horizontal force balance of the beam and avoid beam deformation or crane overturning caused by uneven force distribution. After applying this technology to a bridge project, the hoisting accuracy was controlled within ±5mm, a 5-fold improvement over traditional methods, and the construction period was shortened by 10 days.
During the installation of wind turbine blades, the ground-based pushing equipment and the aerial hoisting equipment coordinate their forces through sensors. The sensors monitor the Mx and My torques at the blade root to ensure that the blade maintains a horizontal attitude during hoisting (torque deviation <10 N·m). At the same time, the ground equipment adjusts the pushing speed and hoisting rhythm based on the thrust feedback in the Fx direction, so that the docking error between the blade and the hub is controlled within 0.5 mm, achieving a 100% installation qualification rate.
IV. Technological Breakthroughs and Future Directions
The application of the six-dimensional force sensor in complex environments benefits from breakthroughs in three key technologies: First, the material process for extreme environments, using 316L stainless steel encapsulation and high-temperature strain gauges, enables the sensor to operate stably under conditions ranging from -50℃ to 200℃ and 100MPa water pressure; second, the anti-interference algorithm, which uses adaptive filtering technology to filter electromagnetic, vibration and other interference signals, improving the signal-to-noise ratio to 90dB; and third, the low-power design, which uses energy harvesting technology, allowing it to operate continuously for more than 6 months without an external power supply.
In the future, with the convergence of the Internet of Things and edge computing, six-dimensional force sensors will become core nodes in complex environment perception networks. By fusing data with sensors such as temperature, humidity, and vibration sensors, they will build more comprehensive environmental perception models. Meanwhile, the development of flexible sensors will enable them to adapt to more irregular device surfaces, further expanding application scenarios.
From nuclear power plants to deep-sea oil fields, from earthquake ruins to bridge construction sites, six-dimensional force sensors are providing robust guarantees for operational safety and efficiency in complex environments with their precise force sensing capabilities. They are not merely simple measuring tools, but also crucial links connecting the physical world and digital systems, driving the development of intelligent and unmanned operations in extreme environments.
