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

Sun B, Li B - Sensors (Basel) (2015)

Bottom Line: As a result the measurement accuracy of the Laser Displacement Sensor was less than 10 μm.Using a standard gauge block as a measurement reference, the coordinate system conversion data is simple and practical.It not only improves the measurement accuracy of the blade surface, but also its measurement efficiency.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China. sun075634@stu.xjtu.edu.cn.

ABSTRACT
This paper proposes a rapid method to detect aero-engine blade form, according to the characteristics of an aero-engine blade surface. This method first deduces an inclination error model in free-form surface measurements based on the non-contact laser triangulation principle. Then a four-coordinate measuring system was independently developed, a special fixture was designed according to the blade shape features, and a fast measurement of the blade features path was planned. Finally, by using the inclination error model for correction of acquired data, the measurement error that was caused by tilt form is compensated. As a result the measurement accuracy of the Laser Displacement Sensor was less than 10 μm. After the experimental verification, this method makes full use of optical non-contact measurement fast speed, high precision and wide measuring range of features. Using a standard gauge block as a measurement reference, the coordinate system conversion data is simple and practical. It not only improves the measurement accuracy of the blade surface, but also its measurement efficiency. Therefore, this method increases the value of the measurement of complex surfaces.

No MeSH data available.


The schematic diagram of direct laser triangulation.
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sensors-15-12782-f005: The schematic diagram of direct laser triangulation.

Mentions: Figure 5 shows a typical direct laser triangulation schematic; an optical system consists of a laser transmitter, convergent lens, receiving lens, the CCD linear array sensor and subsequent signal processing circuit, etc. Suppose the light spot emitted by the LDS irradiates on the surface of the measured object position A, Point B is a reflective spot on the CCD imaging position. If the position of point A1 changes and movement distance is x, thus the displacement of the spot on the CCD image point is x′.


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

Sun B, Li B - Sensors (Basel) (2015)

The schematic diagram of direct laser triangulation.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507604&req=5

sensors-15-12782-f005: The schematic diagram of direct laser triangulation.
Mentions: Figure 5 shows a typical direct laser triangulation schematic; an optical system consists of a laser transmitter, convergent lens, receiving lens, the CCD linear array sensor and subsequent signal processing circuit, etc. Suppose the light spot emitted by the LDS irradiates on the surface of the measured object position A, Point B is a reflective spot on the CCD imaging position. If the position of point A1 changes and movement distance is x, thus the displacement of the spot on the CCD image point is x′.

Bottom Line: As a result the measurement accuracy of the Laser Displacement Sensor was less than 10 μm.Using a standard gauge block as a measurement reference, the coordinate system conversion data is simple and practical.It not only improves the measurement accuracy of the blade surface, but also its measurement efficiency.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China. sun075634@stu.xjtu.edu.cn.

ABSTRACT
This paper proposes a rapid method to detect aero-engine blade form, according to the characteristics of an aero-engine blade surface. This method first deduces an inclination error model in free-form surface measurements based on the non-contact laser triangulation principle. Then a four-coordinate measuring system was independently developed, a special fixture was designed according to the blade shape features, and a fast measurement of the blade features path was planned. Finally, by using the inclination error model for correction of acquired data, the measurement error that was caused by tilt form is compensated. As a result the measurement accuracy of the Laser Displacement Sensor was less than 10 μm. After the experimental verification, this method makes full use of optical non-contact measurement fast speed, high precision and wide measuring range of features. Using a standard gauge block as a measurement reference, the coordinate system conversion data is simple and practical. It not only improves the measurement accuracy of the blade surface, but also its measurement efficiency. Therefore, this method increases the value of the measurement of complex surfaces.

No MeSH data available.