Artemenko

pp. 682-704

pp. 357-370

This is the fourth paper in the series of four works dedicated to design of parallel mechanisms for orientation of the space observatory “Millimetron”. In this work the authors consider problems of providing high-precision geometry of the space observatory “Millimetron” released on the orbit along with its very precise pointing at the observable object. These problems are caused by very high sensitivity of the observatory and its operation under conditions of deep vacuum and extra-low temperatures. The concept of intelligence system of active vibration protection and very precise pointing of the space observatory “Millimetron”  was introduced. This is a unique system; it allows to increase efficiency of vibration protection and precise pointing of the observatory significantly.

This is the third paper in the series of four works dedicated to design of parallel mechanisms for orientation of the space observatory “Millimetron”». In this work, a method of synthesis of plain six-link mechanisms with three degrees of freedom was proposed. This method takes into account restrictions imposed by requirements to orientation of the space observatory’s antenna. A distinctive feature of the proposed method is decomposition of the synthesized mechanism into two more simple mechanisms – a double pendulum mechanism and a two-beam mechanism. The first mechanism has two degrees of freedom and is designed for maintaining a point in a constant position; the second mechanism’s output link rotates around the first one by a specific angle. All unknown sizes of the mechanism’s links and turning angles were determined in this work. The authors defined a dependence of the turning angle of the output link on the turning angle of the input link of the two-beam mechanism that is a transfer function. Besides, the problem of maintaining an invariable position of the center of mass of the space observatory’s antenna was considered when changing its orientation.

This is the second paper in the series of four works dedicated to design of parallel mechanisms for orientation of the space observatory “Millimetron”. In this article the authors stated a problem of “Millimetron” observatory's antenna orientation with the use of a parallel hexapod-based multi-sectional manipulator. The manipulator was designed in Solid Works software package. The Manipulator's 3D-model created in NX5 with the use of “Kinematic Simulation of Mechanisms” software package is introduced in this work. Software for solving direct and inverse kinematic problems was designed. A model of the guided five-section manipulator developed in MatLab Simulink software package is also described.

This paper is an introductory start of a series of four papers dedicated to design of parallel mechanisms for orientation of the space observatory «Millimetron». General description of the «Millimetron» project is provided in this paper. Variations of the space observatory design concepts are considered. The whole series of papers is briefly described. The «Millimetron» project is aimed at creation of a space observatory with a 10-meter cryogenic radar telescope which is capable of working within the waveband from 20 mm to 20 um. The «Millimetron» observatory is designed for conducting investigations of various types of highly sensitive objects (single telescope mode) and record high angular resolution (ground-space interferometer mode) within the infrared and millimeter ranges of wave length. Very high sensitivity of a space telescope is achieved by means of cryogenic cooling of an antenna reflector, thermal shields and receiving equipment with liquid helium.