Next Article in Journal
Video Smoke Detection Method Based on Change-Cumulative Image and Fusion Deep Network
Next Article in Special Issue
A Weather Forecast Model Accuracy Analysis and ECMWF Enhancement Proposal by Neural Network
Previous Article in Journal
Improved Performance of Fundamental Mode Orthogonal Fluxgate Using a Micro-Patterned Meander-Shaped Ribbon Core
Previous Article in Special Issue
Calibration Method of Orthogonally Splitting Imaging Pose Sensor Based on KDFcmPUM
Open AccessArticle

A Laser-Based On-Machine Measuring System for Profile Accuracy of Double-Headed Screw Rotor

School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(23), 5059; https://doi.org/10.3390/s19235059
Received: 5 November 2019 / Revised: 18 November 2019 / Accepted: 18 November 2019 / Published: 20 November 2019
Great length, large weight and other factors may cause difficulty in measuring the profile accuracy of the double-headed screw rotor. To solve this problem, an on-machine measuring system based on a laser-displacement sensor (LDS) was designed and implemented in this paper by taking an LXK100 four-axis whirlwind milling machine as the carrier. To improve the measurement accuracy of the system, the generalized variable-structural-element morphological method, polynomial interpolation algorithm and ellipse fitting method were first combined to realize the rapid subpixel centroid extraction from a noise-containing spot image, thus improving the data acquisition accuracy of the LDS, and then the hybrid method was experimentally verified. Next, a wavelet threshold function with high-order differentiability and adaptive wavelet coefficient contractility was constructed based on the hyperbolic tangent function, so as to inhibit the disturbance from random errors and preserve real profile information, and this method was simulated and verified. Subsequently, a smoothing algorithm for point cloud data was proposed based on the Lagrange multiplier method to avoid the defect of the piecewise curve-fitting method, that is, function continuity and differentiability could not be satisfied at piecewise points. Finally, the profile accuracy was calculated in real time according to the data reconstruction result and the machining quality was judged. The measurement experiment of the double-headed screw rotor indicates that the proposed on-machine measuring system can complete the profile accuracy measurement for a screw pitch within 39.7 s with measurement accuracy reaching ±8 μm, and the measurement uncertainties of the major axis, minor axis and screw pitch are 0.72 μm, 0.69 μm and 1.24 μm, respectively. Therefore, the measurement accuracy and efficiency are both remarkably improved. View Full-Text
Keywords: screw rotor; laser displacement sensor; optical inspection; data processing screw rotor; laser displacement sensor; optical inspection; data processing
Show Figures

Figure 1

MDPI and ACS Style

Dong, Z.; Xu, F.; Sun, X.; Liu, W. A Laser-Based On-Machine Measuring System for Profile Accuracy of Double-Headed Screw Rotor. Sensors 2019, 19, 5059.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop