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The Vibration Control and Measurement for the Cabin Supporting Structure of Large Radio Telescope

Author: DongZhiQiang
Tutor: DuanBaoYan
School: Xi'an University of Electronic Science and Technology
Course: Mechanical Manufacturing and Automation
Keywords: MTMD Support structure of the feed cabin Damping Genetic Algorithms Stereo vision Laser Station Wavelet de-noising
CLC: TH751
Type: PhD thesis
Year: 2003
Downloads: 208
Quote: 1
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Abstract


This is a large radio telescope (Large Radio Telescope) an integral part of the the feed tank support structure pre-research work, mainly related to damping of cabin and cabin structure and orientation of measurements of two parts. A. Of cabin vibration is the main work of this paper. Using the finite element method, the the analog feed cabin support structure under the action of wind load dynamic response, on this basis, to discuss the characteristics of multi-tuned mass damper (MTMD) and its application in the inhibition of the feed cabin vibration. The specific contents are as follows: 1. Optimization strategy, iterative solution to fix the cabin static equilibrium position of the supporting structure, six suspension of the force can be as uniform as possible. Davenport wind spectrum simulation using the modified random wind, come to the support structure of the feed cabin in the displacement time under different wind speeds. 2. Analysis of the frequency response characteristics of a single degree of freedom are attached MTMD discussed the the MTMD the quality, quantity, control band width, damping ratio and other factors on the damping effect. 3. Using the vibration the MTMD suppression of cabin, the MTMD the group number, frequency, quality, damping ratio and other factors impact on the the feed cabin displacement of harmonic response. Davenport wind spectrum-based displacement harmonic response root variance as the objective function, the application of genetic algorithm, the the MTMD optimal parameter values ??obtained in the frequency domain. 4. As the feed cabin amplitude minimum objective function tuning method to obtain the MTMD the optimal parameter values ??in the time domain. 5. When the feed cabin in different locations of the observed trajectory analysis of the vibration characteristics of the system under simulated wind load, and discuss the applicability of the MTMD. 6. When the the feed cabin along the astronomical observations trajectory, Fourier analysis to determine the the MTMD control band, the experimental results show that, MTMD can effectively suppress the vibration of the feed cabin in the course of the campaign. 7. When the feed cabin in a different location by impact excitation, the MTMD the damping effect, the experimental results show that using MTMD can effectively suppress the impact excitation caused by vibration. II. In order to achieve high-precision control of cabin, accurate measurement of the feed cabin on three non-collinear coordinates of the target point, the position and attitude of the real-time determination of cabin. In this paper, the following two methods of measurement, and the measurement results of wavelet denoising: 1. Stereo vision measurement method: using three CCD cameras, each camera simultaneously track two target points, each of the two cameras to determine the world coordinates of a target point. Combined with the correlation tracking algorithm, the centroid tracking algorithm, confidence fusion, goals and gate prediction technology to achieve a dynamic multi-target tracking and high-precision measurement of anti-jamming. 2. Laser measurement methods: the use of three laser total station, dynamic tracking and measuring the coordinates of the center of the three prism feed cabin and the position and attitude by the coordinate transformation of cabin. Xi'an University of Electronic Science and Technology doctoral thesis, wavelet de-noising technology to reduce measurement error due to stereo vision and laser total station coordinates are measured error, you can more accurately determine the location and trajectory of the feed cabin. , Xi'an University of Electronic Science and Technology of feed cabin support structure 50 meters outdoor model in the completion of the theoretical work on the basis of the implementation of a large number of experiments, a large number of experimental data, the results show that the vibration the MTMD suppression of cabin, stereo vision and laser total station measuring the coordinates of the target point and wavelet denoising are valid, laid a theoretical foundation for the future of damping applied to the 500-meter radio telescope and measurement.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Astronomical instruments > Telescope
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