Thermal and Wind Effects on the Azimuth Axis Tilt of the ASTE 10-m Antenna

Details Thermal and Wind Effects on the Azimuth Axis Tilt of the ASTE 10-m Antenna Thermal and Wind Effects on the Azimuth Axis Tilt of the ASTE 10-m Antenna

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pnaoj..10...25u&link_type=abstract

Publications of the National Astronomical Observatory of Japan, 10, p.25-33

Computer Science

Performance

1

Radio Telescope: Pointing, Inclinometer, Thermal Load, Wind Load

Scientific paper

The azimuth axis tilt of the ASTE 10-m antenna induced by thermal and wind loadings was investigated with a dual-axis inclinometer on the azimuth axis, along with thermometers on the pedestal and yoke structures and an ultrasonic anemometer on a nearby weather station. The dependences of the inclinometer zero-point offsets against temperature of the device, temperature gradients in the pedestal and yoke structure were obtained for the measurements over 11 months during the antenna being parked at its home position (azimuth angles = ?180 degrees, an elevation angle = 60 degrees) under wind velocities < 8 m s-1. The temperature dependences of the zero-point offsets were found to be 1.24 and -0.46 arcseconds/degree, and were close to those obtained with an independent method. The azimuth axis tilts due to the temperature difference between the two opposite sides of pedestal walls were found to be about 1.1 and 1.7 arcseconds/degree, and consistent with 1.5 arcseconds/degree estimated with a simple model. The residual axis tilt of the whole samples after removal of the temperature dependences shows dependence against overturning moment estimated from the wind data. The stiffness of the antenna structures between the yoke base section and the ground was estimated to be 5.3 and 3.4 GNm/rad using the observed tilts in two directions; and were smaller than 6.0 GNm/rad from a mechanical model prediction. Based on these field experiments, we discuss the improvements and limitations of pointing performance with the inclinometer metrology system.

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