Research On Techniques Of Improving Measuring Accuracy Of Laser Tracker Orientation In General Assembly Precision Measurement

Spacecraft assembly precision, the measured parts measured workpiece size big or complicated structure, the light of the laser tracker is often blocked, causing tracker need to move position.Laser tracker transfer station is to the stance of the coordinates measurement registration under the unified coordinate system, and laser tracker transfer station will bring obvious accuracy loss.In this paper, based on a certain type of space products assembly precision scientific research project, to improve the accurate measurement of laser tracker transfer station method specific inquiry.Specific research contents include:In order to ensure the accuracy of measurement of coordinate point of transfer station, transfer station precision of the laser tracker, put forward the use of the site can be traced back to stand standard independent common point to replace the traditional method for transfer station, the use of standard geometric constraint relationship between the feature point on the check whether the measured feature points and qualified with standard esteem heart points involved in the method of transfer station.Based on standard rail station is studied the key technologies.M onte carlo simulation for laser tracker, for example, from the theory is verified by setting the constraint values excluding out-of-tolerance measurement point, can rise to reduce the coordinate point of measurement error and ensure accuracy of coordinate transformation point role.Then further through experimental verification standard to improve the effectiveness of the laser tracker transfer station precision, using standard do not use the standard compared to rail station and a measure of the length of the gauge, length deviation average fell about 0.006 mm, the standard deviation by 0.017 mm.In addition, the study of the use of standard number and space layout principles.Transfer station also affects the tracker parameter calculation algorithm of transfer station precision.In large size measuring software sas, for example analysis introduced common commercial transfer station method.Based on singular value decomposition(SVD) of the basic algorithm, put forward the improved transfer station singular value decomposition algorithm, and through the standard measurement experimental comparison and analysis the accuracy of the improved SVD rail station algorithm.Will ensure that the coordinate point of measurement precision of standard application in a type aerospace precision products, from two aspects of hardware and software design of the precision.Components of products division 1 and 4 fine transfer station and the accuracy analysis of the test data, process, and through the detailed software analysis precision of transfer station and transfer station after final component of central Angle measurement results and the coordinates deviation, standard is used to verify the transfer station can ensure accuracy of transfer station.