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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.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.

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.


Quadratic Bezier curves intersect.
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sensors-15-12782-f013: Quadratic Bezier curves intersect.

Mentions: Before measuring the vane type blade, the inclination calculation method needs to be known. It is necessary to research the method of calculating the normal vector of the free surfaces measurement points. In this section, an improved cross-curve method [17,21,22] based on five data points is developed to calculate the unit normal vector. As shown in Figure 13, the LDS scans along two crossed curves at equal step size. One curve is longitudinal and the other is latitudinal. They intersect at the measurement point. Four points 、、、、 on the two curves are chosen: Two on the latitudinal curve and the others on the longitudinal curve. and are tangent vectors, and is the normal vector of . In addition, the five points are arranged such that one central point is surrounded by four peripheral points approximately 90 degrees apart.


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

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

Quadratic Bezier curves intersect.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-12782-f013: Quadratic Bezier curves intersect.
Mentions: Before measuring the vane type blade, the inclination calculation method needs to be known. It is necessary to research the method of calculating the normal vector of the free surfaces measurement points. In this section, an improved cross-curve method [17,21,22] based on five data points is developed to calculate the unit normal vector. As shown in Figure 13, the LDS scans along two crossed curves at equal step size. One curve is longitudinal and the other is latitudinal. They intersect at the measurement point. Four points 、、、、 on the two curves are chosen: Two on the latitudinal curve and the others on the longitudinal curve. and are tangent vectors, and is the normal vector of . In addition, the five points are arranged such that one central point is surrounded by four peripheral points approximately 90 degrees apart.

Bottom Line: As a result the measurement accuracy of the Laser Displacement Sensor was less than 10 μm.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.

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.