Translated Abstract
With the rapid development of manufacturing and assembly industry, the traditional large-scale methods can not meet the measurement requirements for the measurement accuracy, measurement scope and measurement efficiency in large-scale measurement occasions such as aircraft manufacturing, shipbuilding, large power station construction and heavy equipment manufacturing.
This thesis proposes a new large-scale measurement system—Rotary-laser Theodolite Positioning System(RLTPS). This system has such features as high accuracy, good system scalability, supporting multi-user parallel measurement and automated measurement, and hence possesses extensive applied prospect in large-scale coordinate measurement.
The main work in this thesis is as follows:
1. Aiming at the need for large-scale measurement, the common large measuring instruments at home or abroad are reviewed. On this basis, we propose the RLTPS system which is composed of laser transmitter network, photo-electronic sensors and computer system. Then, the measurement principle and mathematical model of RLTPS are introduced and its operation process is described. In addition, two kinds of reference datum of the system are raised.
2. The system uses silicon photocell as the measurement sensor. According to the photoelectric characteristics of silicon photocell, the signal processing circuit of the system is designed and fabricated. The photoelectric signal can be suitable for the data acquisition card through the preamplifier, ambient light compensation, band-stop filter and low-pass filter.
3. This thesis presents the calibration algorithm and measurement model of a combination-type probe. Two kinds of the combination-type probe—the hand-held probe and the array probe are designed by using the redundancy rules. In the Matlab environment, both probes are simulated and studied on the relationship between structural parameters and measurement errors.
4. The positioning system is verified by experiments. In the measurement experiments, the measuring accuracy of the system can reach 0.1mm in the range of 5 meters. The effect of the probe stylus length on the accuracy of combination-type probe is analyzed by using Leica T-Probe. In measurement application, an automobile hood was measured successfully by this measurement system. Finally, the pose of aircraft side panel was tracked by using this system and good measurement results were obtained.
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