The article discusses a hot topic concerning the organization and implementation of a proprietary method of the technical service aimed at solving the problems of technological modernization of manufacturing facilities, machines and equipment and more efficient use of financial means allocated by the government of the Russian Federation for these purposes through increasing a level of competitiveness thanks to growing quality and reliability of equipment. Based on the analysis the paper gives an accent on the factors that are capable to provide a rate of return sufficient for additional, along with the state support, investments of innovative development of the enterprise because of technological modernization of production. Such an approach to technological modernization of mechanical engineering plants allows 3–5 times enhancement of their development rates provided that a careful scheduling of activities is based on the organizational and technological design. The researches have allowed us to formulate the proposals for the project implementation on innovative development of mechanical engineering.

The paper deals with modeling methods of frame structures, used in rocket technology. To estimate their inertia, stiffness and strength properties there is a need to create its calculation model. For this purpose now a finite element method is generally used. These models may use various finite elements and combinations thereof. It is obvious that the calculation has found that parameters of the structure under study depend on the selected calculation model.

The paper discusses some issues concerning the idealization of elements of the hypothetical frame structure. To simulate the element properties of a longitudinal set (stringers and longerons) and struts as well is offered idealization of beam, because their crosswise dimensions are substantially smaller than the longitudinal ones. Elements of a crosswise force set (frames) represent a welded plate structure that has arch-curved shape of variable cross-section with holes. Welded tubes of different diameter reinforce holes in plates. In vertical plates there are cutouts to mount stringers. To take in full into consideration these features in the rod idealization of frames is impossible. Therefore it seems more appropriate to use plate finite elements to simulate frames.

The paper considers two possible frame models the to show their stiffness properties, namely a rod model and a plate one. It shows the advantages and disadvantages of given design schemes of the frame. Based on the test calculations the paper shows which errors in calculating the stiffness properties of the frame under consideration can be obtained using the rod model.  Recommendations for judicious use of possible models of the frame at different designing stages are made.

To create the studied frame models and their test calculations and analyze the results of calculation was used a SADAS software package developed at the SM8 Department of BMSTU.

One of the most important requirements imposed to the modern mechanisms is economic feasibility. Therefore, considered as advanced are mechanical transducers of rotary motion to translational one, where rolling friction is mainly realized. They include planetary roller-screw mechanisms (PRSM).

PRSM has a large variety of features. The design feature of PRSM is multiple starts of screw and nut thread. Rollers, as a rule, are made single-threaded. Number of screw thread starts which equals to a number of nut thread starts, has an effect on almost all performance characteristics of PRSM.

This article covers comprehensively enough the influence of screw thread starts quantity on: kinematical parameters of PRSM, transfer function, mechanism radial dimensions, efficiency, power values, required characteristics of electric motor. As a result of investigations the graphs of dimensionless parameters vs. number of screw thread starts have been plotted, which are demonstrative and common.

Being high enough the PRSM efficiency can vary within 20…25% and more. It depends on a variety of mechanism part parameters; primarily on geometrical ones, as well as on a number of screw thread starts. Previously the methods of PRSM design calculation consisted in determination of the main geometric parameters of mechanism parts, then in determination of mechanism efficiency. At that, it was not always possible to design the economically feasible PRSM structure.

Introduction of a dimensionless value – a relation of PRSM part thread pitch to average screw thread diameter – contributed to successive plotting of the assemblage of curves for relation of efficiency to the indicated ratio and a number of screw thread starts. By taking this assemblage of curves as a basis, the method of economically feasible PRSM structures calculation and design was proposed.  The essence of the developed method lies in that selection or definition of a number of screw thread starts helps to determine the relation of PRSM parts thread pitch to average diameter of screw thread which provides the maximum possible efficiency. Given further are check calculations confirming the operation capability of the selected PRSM design.