A Dynamic Pose-Testing Technique of Landing Gear Combined Stereo Vision and CAD Digital Model

Area of Science:

• Aerospace Engineering
• Mechanical Engineering
• Computer Vision

Background:

• Landing gear is critical for aircraft safety, experiencing high stress during operation.
• Accurate structural testing requires precise measurement of landing gear dynamics.
• Existing methods face challenges with environmental factors like occlusion.

Purpose of the Study:

• To develop a visual measurement method for dynamic landing gear pose.
• To synchronize physical landing gear motion with its CAD digital model.
• To enhance accuracy and environmental adaptability in landing gear testing.

Main Methods:

• Combines stereo vision and CAD digital models for measurement.
• Establishes a measurement reference within the CAD model.
• Utilizes close-range photogrammetry and binocular stereo vision to unify coordinate systems.
• Tracks key points on the physical landing gear for synchronization.

Main Results:

• Achieved Root Mean Square Error (RMSE) for angle error below 0.1°.
• Achieved RMSE for trajectory error under 0.3 mm.
• Demonstrated accuracy suitable for landing gear retraction and extension tests.

Conclusions:

• The proposed method meets accuracy requirements for landing gear pose measurement.
• Offers improved environmental adaptability compared to existing techniques.
• Enables retrieval of pose information for any point on the landing gear.