Real-Time Estimation of Wind-Induced Pointing Error via Accelerations Measurement for Large Reflector Antenna

Liang, Wei; Huang, Jin; Zhang, Jie

doi:10.1109/access.2020.2984636

Cited by 3 publications

(6 citation statements)

References 20 publications

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“…For the 7.3 m antenna colored dark blue in Figure 1, the wind disturbance mainly excites two-order modes in the elevation and azimuth directions of the reflector (Liang et al, 2019(Liang et al, , 2020(Liang et al, , 2021). An adaptive anti-wind disturbance system that consists of a vibration monitoring and control system is designed for this antenna and is shown in Figure 1.…”

Section: The Structural Framework Of the Cable Actuation Systemmentioning

confidence: 99%

“…When the average wind speed is 10 m/s and the wind is blowing from the side of the 7.3 m antenna, the position of the drivers in Figure 3 can be optimized with the joint optimization method (Liang et al, 2021). The detailed numerical modeling method of the wind field is described in Liang et al (2019) and Liang et al (2020). The sensor layout is given in Liang et al (2020).…”

Section: Application Examplesmentioning

confidence: 99%

“…The detailed numerical modeling method of the wind field is described in Liang et al (2019) and Liang et al (2020). The sensor layout is given in Liang et al (2020). The bandwidth of the cable actuator control system is set to 10 Hz, and the maximum cable tension is limited to 1000 N.

Figure 3.Location of the drives.…”

Section: Application Examplesmentioning

confidence: 99%

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Vibration reduction control by a cable actuation system for reflector antenna

Liang

Geng

Huang

et al. 2022

Journal of Vibration and Control

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Vibration deformation of a reflector antenna under a moving load will reduce pointing performance. Current vibration suppression technology for reflector antennas, such as the application of mesh reflector antennas, the construction of large radomes, the use of antennas with high stiffness, and the improvement of the shaft servo systems, can reduce the impact of vibrations. However, the disadvantages of high-frequency transmission, high cost, increased weight, and servo bandwidth limitations, are unavoidable. A cable actuation system is proposed as a method for reducing the vibration of reflector antennas while having little influence on the original structure. In this method, the acceleration of the reflector is measured, and an unbiased minimum variance estimator of the system state is introduced to observe the vibration state of the reflector. Then using the LQR approach, drivers on the slide rail pull the cables to suppress the vibration of the reflector. Moreover, the position of the drivers on the slide rail can be adjusted depending on the moving load condition. Finally, the experimental results show that the vibration time of the reflector without control was approximately 7 s, while the vibration time of the reflector with control was reduced to approximately 1 s when the pendulum fell from the same height to excite the reflector.

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Section: The Structural Framework Of the Cable Actuation Systemmentioning

confidence: 99%

Section: Application Examplesmentioning

confidence: 99%

See 1 more Smart Citation

Vibration reduction control by a cable actuation system for reflector antenna

Liang

Geng

Huang

et al. 2022

Journal of Vibration and Control

Self Cite

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show abstract

“…For the 7.3 m antenna in Figure 7, the first two modes of the main reflector around the V e -axis and the U e -axis are mainly excited by wind disturbance. [12][13][14] Simply, we can choose the first and the third cable tension to suppress the vibration mode around the V e -axis, and the second and the fourth cable tension to suppress the vibration mode around the U e -axis. As shown in Figure 8, the moment of cable i to the coordinate origin is…”

Section: Key Geometric Parametersmentioning

confidence: 99%

“…The simulation examples of a 7.3-m antenna under the wind disturbance are used to illustrate the locations-optimization algorithm of multiple cable-drivers. The sensor layout is shown in Figure 10, readers can refer to Liang et al 13,14 for the sensor placement method. And the related parameters used for simulation are given in Table 1.…”

Section: Numerical Examplesmentioning

confidence: 99%

Locations optimization of multiple cable-drivers for an anti-wind disturbance system in large antenna

Liang

Huang

Zhang

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Since the structural vibration deformation of a large antenna under wind disturbance leads to the pointing deterioration, an adaptive anti-wind disturbance system was presented by Liang et al. (Int. J. Antennas Propag., Article ID 2015341, 2019). To further improve the vibration suppression performance, this paper presents a locations-optimization algorithm of multiple cable-drivers for the anti-wind disturbance system. First, according to the spatial geometric relationship among the antenna structure, single slide track, four cables and drivers, the feasible domain of the drivers is determined. Next, the separate optimization method, and the joint optimization method for the locations of the four drivers are proposed, respectively. Finally, the simulation implementation of a 7.3 m antenna under various wind conditions is used to compare the joint optimization method and the separate optimization method.

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Estimation of Pointing Errors of Large Radio Telescopes under Solar Radiation Based on Digital Twin

Wei,

Kong,

Wang

et al. 2024

Preprint

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The pointing accuracy of large radio telescopes is affected by antenna structure errors, installation errors, servo errors, gravity, and varying environmental factors. It is hard to estimate the pointing error of radio telescopes under solar radiation via the traditional multi-parameter static pointing models, due to the time-varying characteristics of the dynamic pointing error. There is still no effective way to estimate the dynamic pointing error of large radio telescopes under solar radiation up to now. To estimate the dynamic pointing error of large radio telescopes under solar radiation, a new way based on digital twin(DT) is tried in this paper. The operational framework of the DT system of large radio telescopes is introduced first. Then, the Wuqing 70-m radio telescope(WRT70) is taken as the research object, the digital models of which are created. Finally, the reliability of the WRT70's DT system is verified and the dynamic pointing error of WRT70(staying at the position of the elevation angle of 90° and the azimuth angle of 180°) on two sunny days in different seasons is estimated by the created DT system. The research results show that the pointing error of large radio telescopes under solar radiation fluctuates greatly and the seasonal differences are very striking. The maximum elevation pointing error of WRT70 under solar radiation around the winter solstice is over 40 arcsec, which should never be ignored. The way is feasible to estimate the dynamic pointing error of large radio telescopes staying at a specific position under solar radiation via constructing a DT system in this paper, but it is not yet able to estimate effectively the dynamic pointing error of large radio telescopes being in action. It is expected to establish a dynamic pointing error model and calibrate the dynamic pointing errors of large radio telescopes being in action by DT technology in the future.

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Real-Time Estimation of Wind-Induced Pointing Error via Accelerations Measurement for Large Reflector Antenna

Cited by 3 publications

References 20 publications

Vibration reduction control by a cable actuation system for reflector antenna

Vibration reduction control by a cable actuation system for reflector antenna

Locations optimization of multiple cable-drivers for an anti-wind disturbance system in large antenna

Estimation of Pointing Errors of Large Radio Telescopes under Solar Radiation Based on Digital Twin

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