Venus-Centered Heliosynchronous Orbits with Smart Dusts

Abstract

This paper deals with the problem of determining an analytical control law capable of maintaining highly-elliptical heliosynchronous polar orbits around Venus. The problem is addressed using the Smart Dust concept, a propellantless propulsion system that extracts momentum from the solar rays using a reflective coating. The modulation of the thrust magnitude is performed by exploiting the property of electrochromic materials of changing their optical characteristics through the application of an electrical voltage. The propulsive acceleration can therefore be switched from a minimum to a maximum value (o vice versa) so as to obtain a simple on-off control law. The required Smart Dust performance are described in closed form as a function of the semimajor axis and eccentricity of the working orbit. The soundness of the analytical control law is validated through a numerical integration of the equations of motion, in which the orbital perturbations due to the oblateness of Venus and to the gravitational attraction of the Sun are also included.

Teaching Practice and Reflection on the Course Instance Based on the BOPPPS Model

“…The model has been introduced by more than 33 countries around the world, and has been promoted in more than 100 universities and industry around the world, and its application practices suggest that the model is an effective way to promote students' active participation in classroom learning [3][4][5][6]. In the introduction of extensive application and practice teaching, the BOPPPS model is applied to various courses teaching design [7][8][9], such as "basis of computer engineering "," computer network principle", "signal analysis and processing", etc., which has achieved a certain effect and results.…”