Studying the effect of the beam aerial drive control algorithm on its vibration activity onboard a spacecraft

Аuthors

Ermakov V. Y.

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

e-mail: v_ermakov2003@mail.ru

Abstract

Modern space vehicles (SV), as a rule, include bearing-out structures of slight rigidity. These are solar batteries, antenna-feeder devices, elements of thermal conditioning systems. Actuators and special purpose units, as well as units of technological and support systems are being placed inside the SV hull. SVs are exposed to vibrations from the external and internal perturbance sources both on Earth and in orbit. The feature of the SV loading in orbit is low-force spectrum of perturbances up to tens of Newtons with frequencies from fractions of hertz to hundreds of kilohertz. Vibrations may have deleterious effect upon both orientation and stabilization accuracy, and movement dynamics including various types of orbital maneuvering. These perturbances might be created, for example, by operation of the narrow-beam aerial (NBA) drive, which leads to occurrence of elastic vibrations of the structure and mounting faces of the precise equipment. While the observation session onboard an SV, mechanical disturbances, stipulated by operation of aggregates with non-balanced masses, may occur. This may affect both the orientation accuracy of the SV itself and equipment elements which may degrade the quality of the registered information, and introduce significant error to the SV angular position measurements, obtained by the orientation and stabilization control system. This, in turn, may make the SV mission target task performance impossible. To reduce these perturbances an algorithm for the NBA drive operation for the “Spectr-R” type SV was developed. Dynamic analysis of data obtained for the suggested algorithm and conventional was performed. Positive results of the suggested algorithm, tested on the “Spectr-R” type SV are demonstrated.

Keywords:

space radio-telescope, drive of narrow- beam aerial, foot-pace engine, control system by a drive, frequency tests, moving of “phase center”, vibroactivity, vibrations of resilient body

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