Research on the panel adjustment method of an active main reflector for a large radio telescope

Sun, Zheng; Wang, Jinqing; Yu, Linfeng; Gou, Weiping; Wang, Guangli

doi:10.1088/1674-4527/21/2/38

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…王从思等人 [18] 根据促动器的初始位置和调整点与目标点的关系, 建立了一种新的直接计算促动器运动的数学模型. 孙正雄等人 [19] 给出了一种通过孔径相位剖面来计算调整量, 继而调节天线反射面的计算方法. 王伟等人 [20] .…”

Section: 促动器调整量计算是主动面技术的关键一环有unclassified

Structural modeling and analysis method of the active main reflector of the Qitai radio telescope based on a simplified actuator

BAN,

GAO,

WANG

et al. 2023

Sci. Sin.-Phys. Mech. Astron.

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Herein, the structural modeling and adjustment analysis of the active main reflector of the Xinjiang 110-m Qitai radio telescope (QTT) are performed. First, a simplified actuator is introduced in the QTT antenna structure model, and the active main reflector structural model, including the simplified actuator, is established. Second, the actuator direction of the deformable antenna under the action of external load is obtained from the structural model. Further, by assuming a rigid actuator, active adjustment is further simplified as the finite element constraint equation where the panel support points adjust to the specified displacements along the actuator direction. Finally, the QTT radio telescope model is simulated based on the proposed method. The difference between the calculation results of the proposed method and the simulation results of ANSYS is about 10 −9 mm, which indicates the effectiveness of the proposed method. This work provides a reference for the accurate analysis of the active adjustment of radio telescope antennas by the proposed method.radio telescope, simplified actuator, structural analysis, active adjustment

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Section: 促动器调整量计算是主动面技术的关键一环有unclassified

Structural modeling and analysis method of the active main reflector of the Qitai radio telescope based on a simplified actuator

BAN,

GAO,

WANG

et al. 2023

Sci. Sin.-Phys. Mech. Astron.

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“…The adjustment of the subreflector can compensate the deformation of the primary reflector on a significant level, and the adjustment accuracy of the active panel with multiple actuators is higher. Chen and Sun (Chen et al 2015;Sun et al 2021) conducted research on the impact of displacing the subreflector on antenna performance, and examined the pointing error resulting from the subreflector's offset. Stochino et al (2017) optimized the finite element model of the Sardinia Radio Telescope (SRT) through photographic surveying, providing more accurate error data for surface compensation.…”

Section: Introductionmentioning

confidence: 99%

The Active Compensation Technique for Large Reflector Antennas Based on Quadratic Curve Fitting

Zheng,

Xiang,

Cui

et al. 2024

Res. Astron. Astrophys.

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Active reflectors are often used to compensate the surface distortion caused by environmental factors that degrade the electromagnetic performance of large high-frequency reflector antennas. This is crucial for maintaining high gain working for antennas. A distortion compensation method for the active reflector of large dual-reflector antenna is proposed. A relationship is established between the surface deformation and the optical path difference for the primary reflector by the geometric optics. Subsequently, employing finite element analysis, a polynomial fitting approach is used to describe the impact of adjusting points on the reflector surface based on the coordinates of each node. By standardizing the positions of various panels on the reflector, the fitting equations can be used to the reflector panels of similar shapes. Then, based on the distribution characteristics of the primary reflector panels, the actuators adjustment equation is derived by the influence matrix method. It can be used to determine the adjustment amount of actuators to reduce the root mean square (RMS) of the optical path difference. And, the least squares method is employed to resolve the matrix equation. The example of a 110m aperture dual-reflector antenna is carried out by the finite element analysis (FEA) and the proposed method. The results show that the optical path difference is reduced significantly at various elevation cases, which indicates that the proposed method is effective.

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“…To address issues with surface accuracy caused by the reflector's large size and weight, Yan et al [12] indirectly improved the radio telescope's working accuracy by simplifying the reflector's structure and reducing its weight. Sun et al [13] employed a new algorithm to fine-tune large radio telescope panels with a main reflector, improving the accuracy of the antenna reflector profile from 0.28 mm to the current 0.19 mm. However, none of these studies have considered the structural vibrations resulting from wind load excitation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response and Optimal Design of Radio Telescope Structure under Wind Load Excitation

Wang,

Zhang,

Yang

et al. 2023

Buildings

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The dynamic response of a radio telescope structure under wind load excitation significantly impacts the accuracy of signal reception. To address this issue, this study established a parametric finite element model of a radio telescope to simulate its dynamic response under wind load excitation. An improved Latin hypercube sampling method was applied in the design of experiments (DOEs) to optimize the structural dimensional parameters of various components of the radio telescope with the aim of reducing the dynamic response to wind load. A response surface model and multi-objective genetic algorithm (MOGA) were employed for multi-objective structural optimization of the radio telescope structure. The findings reveal that the thickness of the stiffening ribs, the length of the side of the square hollow pole, the thickness of the middle pole, and the inner diameter of the thin pole are the most influential structural parameters affecting the first-order frequency (F1), second-order frequency (F2), maximum deformation in the x-direction (DX), and maximum deformation in the z-direction (DZ) of the radio telescope, respectively. Optimizing the radio telescope results in a 40.00% improvement in F1 and a 24.16% enhancement in F2, while reducing DX by 43.94% and DZ by 64.25%. The study outcomes offer a comprehensive scheme for optimizing the structural dimensional parameters of various radio telescope components in regions characterized by multiple wind fields.

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Research on the panel adjustment method of an active main reflector for a large radio telescope

Cited by 9 publications

References 18 publications

Structural modeling and analysis method of the active main reflector of the Qitai radio telescope based on a simplified actuator

Structural modeling and analysis method of the active main reflector of the Qitai radio telescope based on a simplified actuator

The Active Compensation Technique for Large Reflector Antennas Based on Quadratic Curve Fitting

Dynamic Response and Optimal Design of Radio Telescope Structure under Wind Load Excitation

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