NTP PIA: Zenit-95

Main article: CAD Computer-aided design systems

Zenit-95 is a software product of domestic production. Provides design and research calculations of a wide class of spatial structures, mechanisms, drives using finite elements.

It is used at industrial enterprises in aerospace, aviation, shipbuilding, engineering, construction, nuclear energy for the calculation and analysis of both simple and complex systems.

2022: Capabilities and features of the Zenit-95 program

According to information for January 2022, the Zenit-95 program provides the following tasks:

• Calculation of stresses and strains in the model under the action of static loads;
• Calculation of stresses and deformations in the model taking into account geometric nonlinearity under time-varying static loads and kinematic boundary conditions;
• Calculation of parameters of dynamic transients taking into account geometric nonlinearity (mechanisms) and changes in the structure of the model (contacts, impacts of links);
• Calculation of frequencies and forms of natural oscillations;
• Calculation of parameters of forced oscillations and structure response to seismic impact;
• Calculation of parameters of stationary heat transfer processes;
• Calculation of parameters of transient heat transfer processes;
• Joint solution of problems of mechanics and thermophysics.

In addition to the above, the program has a number of auxiliary algorithms: determining the characteristics of sections of rod elements, matching initial conditions by speeds and movements, calculating the mass and moments of inertia of the model, etc.

It has extensive modeling and analysis capabilities for simple and complex mechanical systems. The program is used by more than 600 enterprises of aerospace, aviation, shipbuilding, engineering, construction industries, as well as nuclear energy.

The program is taught at a number of universities in the country, including St. Petersburg Polytechnic University, Moscow State Technical University named after Bauman, BSTU "Voenmech" named after D.F. Ustinova.

In the program:

• algorithms Parallel computing for multi-core is implemented, processors which allows you to significantly (several times) reduce the calculation time compared to similar programs. So, the time for solving the test problem of linear statics compared to a conventional algorithm on a dual-core processor is reduced by 1.6 times, on a four-core one - by 3.3 times, on a 16-core one - by 13.2 times.
• Video card resource utilization (GPU) for computing is implemented, which reduces the time to solve problems by tens and hundreds of times (depending on the power of the video card and the task).
• The program solver versions for 32 and 64-bit operating systems are implemented (a special solver for 64-bit systems allows you to more efficiently use computer resources, especially for solving large problems and practically removes restrictions on their volume).
• The version of the program solver for supercomputer (CETUS MP calculator (CETUS), Sarov g., etc.) in the OS is implemented. Linux

A distinctive feature of the program is the ability to solve both the tasks traditional for FEA, solved within the framework of the assumption of small movements, and the problems of dynamics of complex nonlinear mechanical systems, the elements of which make large kinematic movements and simultaneously experience elastic deformations. The program provides joint consideration of large kinematic movements and small elastic deformations of finite elements, as well as changes in the structure of the model during the process under consideration.

In addition, in one model, elements of any types implemented in the program can be combined (volumetric, flat, rod, fastening, mechanism elements, hydraulic and pneumatic drives). Nonlinearity of material properties (ductility) up to destruction is taken into account. Isotropic, anisotropic and orthotropic materials are considered, as well as liquid and soil (Coulomb-More and Drucker-Prager models).

It is possible to calculate assemblies taking into account clearances, tension, threaded connections. In the library of elements there are rod, volumetric PE, plates, contact elements (points, bodies, surfaces), flexible threads, non-holding bonds, fastening elements (welds, bolts, nuts, washers, rivets, studs...), solid bodies, elements of mechanisms, drives, hydraulic and pneumatic drives, elements of logic circuits and automatic control systems.

A convenient and efficient graphic editor is available for entering and editing source data. Import of graphics data (DXF, IGES and STEP format files), import of source data from ANSYS, NASTRAN, COSMOS/M.

The results of solving the above described problems can be output in the form of graphs, tables and structural diagrams in initial and shifted states as a result of deformation at various times, as well as in accordance with the forms of oscillations. Output of stresses in the model PE is provided in the form of colored shading of areas of equal stresses with suppression of invisible lines, with application of specific stress values on the image (digitization). It is possible to image the model taking into account lighting, animation for dynamic processes.

The program has constantly replenished databases for typical data elements (materials, sections of rod elements, etc.).

The program has a standard Windows user interface (the ability to exchange information through the clipboard with other Windows programs, such as Word, Paint, etc.,) and good computing capabilities - solving problems of more than 3,000,000 nodes.