This paper describes a geometric model for assessing the effective area of solar panels with regard to their shadowing when the object is illuminated by the solar flow from a given direction. Using energy methods, the flow density, the irradiation created by it, and the exposure in radiant or effective units of measurement were determined. Both physical and mathematical formulation of the problem of assessing the energy efficiency of solar panels using the method of geometric modeling are described. To evaluate energy efficiency, a voxel geometric model was selected that discretizes the computational space. A significant difference in the developed voxel geometric model is that it is multivalued, i.e. uses not a 2-digit, but a 4-digit code. Such ambiguity allows the decisive algorithm to quickly “figure out” the origin of the shadow source when calculating the total effective area of solar panels. The described software implementation of the geometric model, graphical shell, and model verification results can be used in the optimization system for designing spacecraft and other solar energy facilities.

The task of forming the wind-swept surface according to the results of the aircraft’s inner design is described. The approach of the integration of natural and virtual prototyping in the design of equipment compartments is substantiated. Such approaches open up new possibilities for creating intelligent composition algorithms that eliminate the "blind search". For the practical implementation of these approaches, it is necessary to link the appropriate software to standard geometric modeling systems in the form of additional computational modules. Preparing the aircraft for design automation complicates the mathematical description of geometric models of placed objects, increases the complexity of their visualization in modern computer graphics systems and the need to create an additional interface between new geometric models and common CAD systems (SolidWorks, AutoCAD, COMPAS, etc.).

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Aircraft are great and comprehensive technical systems, which are characterised by the great configuration density. This article presents formation of the geometrical conceptual design of the aircraft on the basis of the formal heuristic procedures within the framework of the infrastructural constraints. In addition, this article includes description of influence of the aerodynamic configuration and the volume-weight configuration upon formation of the geometrical conceptual design of the aircraft, as well as description of other mass/inertia characteristics of the aggregates, which are to be installed within the specific aircraft. This article also states that in the case of the "very strict" infrastructural constraints, it is necessary to solve "the inverse" problem of configuration, that is the problem, where initial data for formation of the geometrical conceptual design of the aircraft are determined by the necessary configuration space, which is determined by the infrastructural constraints. The article presents the project problem (in aggregate) of finding rational values for parameters of the geometrical conceptual design of the aircraft as the problem of the multiple criteria discrete optimisation. This article states that it is possible to formulate this problem as the search of the vector of structural parameters (that is, search of the multitude of the admissible alternatives of the drawing and designing solutions).

In the framework of design automation, the capabilities of receptor (voxel) geometric models in the tasks of automated layout are shown. Being one of the methods of discrete geometric descriptions of composable objects, they make it possible not only to easily determine cases of their mutual intersection, but also to form intelligent composition algorithms (for example, traces). However, the receptor models are inherently in-machine themselves, which significantly complicates their use. At the same time, modeling composable objects by means of CAD systems (AutoCAD, SolidWorks, KOMPAS, Autodesk Inventor, etc.) presents no difficulty. The article shows the possibility of converting a solid-state model made in any of the existing CAD systems into a receptor one. This allows you to continue using this receptor model as the source for the subsequent operations of computer-aided design layout, taking into account additional factors. In our case, this is the definition of the possibility of delivering bulky objects, among others previously placed, which act as areas of prohibition in our case. The practical value of this study is to assess the possibility of moving super-large cargo along the construction site, assessing the ergonomic design of mechanical, electromechanical, airconditioning and other auxiliary equipment of civil and industrial buildings for ease of installation and subsequent maintenance. An algorithm implemented in the form of a macro CAD-system is described: the formation of a receptor model of a relocatable or assembly equipment based on its solid-state model.