The possibility of estimating the fatigue life of aircraft structure at early stages of its design is considered. The assessment is performed based on a series of numerical experiments as well as the kinematic analysis and algorithms to search for rational parameters. The analysis is performed based on the finite element and superelement methods.

On the possibility of structural fatigue properties estimation at the early stages of design analysis

Selection and justification of polymer composite wing load-bearing elements design parameters with material anisotropy and airload

In this paper, a number of test problems for deforming three-dimensional bodies, made of solid and porous materials, are solved on the basis of the method for solving nonlinear problems of the mechanics of a deformable solid body based on defining relations connecting the increments of true stresses and strains within the framework of the finite-element discretization of the computational domain. A good agreement between the calculation results and the known solutions was noted, and some detected patterns of deformation of bodies made of porous material were noted.

Investigation of nonlinear deformation of solid and porous elements of three-dimensional structures

In modern passenger aircraft, polymeric composite materials (PCM) are used to ensure the mass excellence of both lightly loaded elements and aggregates, including wings and feathers caissons. The use of such materials instead of metal alloys makes it possible to reduce the weight of structures, increase the service life, and reduce the complexity of manufacturing and material consumption. Based on the finite element method, a caisson model was created using shell finite elements (FE), considering the anisotropic properties of PCM. To solve the problems of buckling of the elements of the caisson from the PCM, a method of analytical optimization of the stringers pitch and web plates has been developed. Analytical calculation of the local model based on the loads obtained from the global shell finite element model (FEM). The developed methodology allows obtaining a design of a caisson with a minimum mass while maintaining the necessary stiffness and strength characteristics.

Parametric Optimization of the PCM Caisson Structural Strength Elements

Introduction Nowadays there is sufficient number of the working bodies’ parameters, which allow performing technological operations in different conditions with minimal labor and energy resources It is necessary to produce significant excavation during roads’ construction Therefore, to perform such technological procedure excavation and road machinery are used The motor grader is an earth-moving machine and is necessary for surface profiling, moving and construction materials’ level The motor grader efficiency is determined by the performance criterion World producers of earthmoving and road machinery associate the growth of quality and speed of work with the improvement of the executive working bodies Moreover, new design variants of dumps are being developed, including design variants for motor graders Such solution would allow to reduce the necessary number of passages along the construction site and to shorten the time for mounting the working body The article presents the variant of the motor grader working equipment improving by installing the side working dump Materials and methods  The calculated dependences of the main parameters of the motor grader are obtained, such as the coupling weight, the nominal traction force, the resistances arising in the operating mode when cutting and moving the ground, and the total engine power for the operating mode at 4 km per hour speed Strength characteristics of the side working equipment of the motor grader are investigated The analysis is carried out by using the Solid Software Results  The results of the theoretical studies are presented graphically and reflected the stresses, displacements and deformations in proposed lateral working equipment of the motor grader Using the Solid Works software product it is possible to determine the safety margin of the proposed design The conducted research allows confirming the working capacity of the proposed technical solution Discussion and conclusion  The proposed technical solution allows increasing the productivity of the machine while performing the planning works, while maintaining the specified accuracy of their implementation In addition, such design allows profiling not only the horizontal surface, but also the embankment construction when the side blade is located at an angle of up to 20 degrees

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Результаты исследования работоспособности бокового рабочего оборудования автогрейдера

Method of determination of rational design parameters using the finite-element method

Numerical simulation of mechanical systems with an automatic control system at early stages of helicopter design

Methods of computation of the helicopter deformations for the specified flight regime

http://www.dl.begellhouse.com/download/article/5ec92f563ddf3fba/TsAGI4104 (481-504).pdf

Evgueniy Vladimirivich Kasumov

Papers

Method of determination of rational design parameters using the finite-element method

Numerical simulation of mechanical systems with an automatic control system at early stages of helicopter design

Methods of computation of the helicopter deformations for the specified flight regime

Technique of numerical experiments in design calculations of helicopter mechanical systems