A rapid method to achieve aero-engine blade form detection.

Area of Science:

• Mechanical Engineering
• Metrology
• Aerospace Engineering

Background:

• Accurate measurement of complex aero-engine blade surfaces is critical for performance and safety.
• Traditional methods often struggle with speed, accuracy, and handling free-form geometries.
• Existing techniques may not effectively compensate for measurement errors caused by surface inclination.

Purpose of the Study:

• To develop a rapid and accurate method for detecting the form of aero-engine blades.
• To address the challenges of measuring complex, free-form surfaces in aero-engine components.
• To improve both the accuracy and efficiency of blade metrology.

Main Methods:

• Deduction of an inclination error model for free-form surface measurements using non-contact laser triangulation.
• Independent development of a four-coordinate measuring system with a specialized fixture for blade features.
• Fast measurement path planning for blade features and compensation of tilt-induced errors using the developed model.
• Utilizing a standard gauge block for practical coordinate system conversion.

Main Results:

• Achieved a measurement accuracy of less than 10 micrometers for the Laser Displacement Sensor.
• Demonstrated the method's ability to leverage the speed, precision, and wide measuring range of optical non-contact measurements.
• Validated the simplicity and practicality of coordinate system conversion using a standard gauge block.
• Significantly improved measurement accuracy and efficiency for aero-engine blade surfaces.

Conclusions:

• The proposed method offers a significant advancement in the metrology of complex aero-engine blade surfaces.
• It effectively compensates for inclination errors, enhancing measurement precision and efficiency.
• The technique maximizes the benefits of optical non-contact measurement for high-value component inspection.