Barkanov Evgeny

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Verified

Barkanov verified their affiliation via an institutional email.

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• Dr.sc.ing.
• Professor (Full) at Riga Technical University

An identification of material properties in each inverse technique based on vibration tests is performed by minimizing the error functional between the experimental and numerical parameters of structural responses. Unfortunately, the dynamic parameters of test samples are very sensitive to experimental errors and numerical models applied in the ide...

The present work considers two types of functionally graded material with the through-the-thickness distributions in the core of a sandwich beam. A numerical study of free vibrations of a sandwich beam was carried out using the finite element method (using ANSYS) and corresponding modal parameters (natural frequencies and mode shapes) were determin...

New finite element models and algorithms are developed for a solution of coupled electro-magnetic-thermo-chemical problem arising in microwave assisted pultrusion processes. In the first algorithm stage, the microwave set-up is predefined according to the requirements on energy-effectiveness and homogeneity of generated absorption field, in the sec...

Pultrusion is a technological process in which fibers impregnated with resin move through the heated die and solidify into a composite profile with a constant cross section, as in the metallic die. The effectiveness and productivity of conventional pultrusion processes, preserving the quality of pultruded profiles, could be improved by process opti...

An application of thermal analogy for the solution of active control problems is demonstrated for quasi-static beam testing and investigation of the active twist behaviour of smart helicopter rotor blade. To obtain accurate finite element solutions, rigorous convergence study using different finite element types and modelling approaches is carried...

In this work, the research results are presented highlighting the influence of the spar structure on a helicopter SMART rotor blade stress-strain state, taking into account the operational and control loads, geometry features, reinforcement scheme and the composite material structure. To describe the mechanical behavior of a model SMART blade, it w...

As part of the research, a mathematical model was developed and the formulation of coupled boundary-value problems of electroelastic deformation of an inhomogeneous anisotropic body was stated. Using the method of averaging over the volume, the effective piezoelectroelastic constants of Macro Fiber Composite with piezoelectric fibers were calculate...

Two optimisation problems are formulated for an improvement of the effectiveness and productivity of pultrusion processes, preserving the quality of pultruded profiles, and taking into account an ambient industrial shop temperature and requirements of the process technologists. For a solution of these new problems, an optimisation methodology, usin...

The present work is devoted to a numerical study of the deformation of a main rotor blade made of polymer composite materials with active geometry control by embedded piezoelectric actuators. Numerical modeling of mechanical deformation of a controlled helicopter blade was carried out using a coupled piezoelectric model and using a thermo-piezoelec...

For the real time characterization of pultrusion processes with a complex temperature control, two finite-element modeling approaches utilizing a continuous model with lumped material properties for a cured composite have been developed. The first procedure, based on the mixed time integration scheme and the nodal control volumes method, is working...

In the framework of this work, a mathematical model was formulated for calculating the stress-strain state of layered polymer composite materials equipped with control piezoelectric actuators. The research has been carried out to define the influence of covering composite materials, and the piezoelectric actuators location, on the SMART blade torsi...

A mathematical model is formulated for calculating the stress-strain state (SSS) of piezoelectric layered polymer composite materials (PCM) equipped with a control piezoactuator. The model implements the principle of thermo-piezoelectric analogy, which allows to move from the coupled boundary value problem of electroelasticity to the boundary value...

In the framework of this work, we study the effect of an actuator PZT fibers polarization angle on the mechanical behavior of a controlled structure made of polymer composite materials (PCM). A mathematical model was formulated for calculating the stress-strain state (SSS) of piezoelectric layered PCMs equipped with a control piezoelectric actuator...

For in-line characterization of pultruded profiles, two alternative ANSYS based finite element modelling approaches using the same continuous model with lumped material properties for the cured composite are developed, compared and discussed. The first procedure is developed in ANSYS Mechanical environment and based on the mixed time integration sc...

Laminate composite structures are widely used in different sectors of industry due to their remarkable stiffness and damping performance. The present study focuses on the damping identification and prediction for laminated composite plates. The damping model based on the strain energy method was used for damping coefficients identification and for...

Laminated composite structures have considerably higher ability for the vibration damping than structures made of conventional materials. On the other hand the prediction of damping of composite structures is not straightforward due to their anisotropic behaviour. The anisotropic nature of composites brings the need for the accurate measurement of...

Finite element analysis of sandwich and laminated composite structures with viscoelastic layers is performed. The present implementation gives the possibility to preserve the frequency dependence for the storage and loss moduli of viscoelastic materials exactly. Moreover, the storage and loss moduli in this case are defined directly in the frequenc...

As opposed to single-parametric ultrasonic pulse velocity measurements, a multi-parametric approach is proposed for assessment of the condition of constructional materials and early stages of its degradation. The method is based on acquisition of ultrasonic signals by stepwise profiling of the material surface at several frequencies in the range fr...

The application of macrofiber composite (MFC) actuators to an active twist control of helicopter rotor blades significantly reduces the vibration and noise without the use of complex mechanisms in the rotating systems. The applicability of two main spar designs and two variants of utilization of MFC actuators for an active twist of advanced helicop...

To provide better understanding of the pultrusion processes without or with temperature control and to support the pultrusion tooling design, an algorithm based on the mixed time integration scheme and nodal control volumes method has been developed. At present study its experimental validation is carried out by the developed cure sensors measuring...

The dissipative characteristics of rubber-cord composites under the action of cyclic load considering the features of their self-heating have been experimentally investigated. Full-scale uniaxial tension experiments are performed on the plane specimens along the reinforcement fibers of the unidirectional rubber-cord composites. In compliance with t...

For experimental and numerical investigation of the repaired pipeline prototype, the small-scale vessel model was produced. At the first stage of the experiment, the deformed state of the vessel with an artificially created surface defect was studied by the tensometry method. At the second stage, a fiberglass wrap was installed on the steel vessel...

Universal non-destructive techniques, adapted or developed for an effective and accurate characterisation of mechanical properties of composite materials, used in the advanced repair systems of pipelines with volumetric surface defects, are presented. There is static approach using three-points-bending tests and two dynamic methods: impulse excitat...

Despite technical advancement and wide industrial application, long-range ultrasonic testing (LRUT) has several bottlenecks, which restrict its abilities and complicate the data interpretation. Particularly, these are related to simultaneous presence along with the main used torsional wave (T-wave) of other wave modes, including longitudinal (L-wav...

Optimisation methodology for composite repair systems of transmission pipelines with volumetric surface defects is presented. Due to large dimension of the numerical tasks to be solved, this methodology is developed employing the method of experimental design and response surface technique. To bring an efficiency of damaged section up to the level...

We propose an analytical algorithm to study harmonic oscillation of a rectangular elastic plate in an incompressible fluid, with varying pressure conditions. Application of the two-dimensional Fourier transform leads to a two-dimensional integral equation with a two-dimensional integral as a kernel. The solution of the basic integral equation is re...

This book describes efficient and safe repair operations for pipelines, and develops new methods for the detection and repair of volumetric surface defects in transmission pipelines. It also addresses the physics, mechanics, and applications of advanced materials used for composite repair of corroded pipelines. Presenting results obtained in the Eu...

This paper presents optimisation methodology for the design of the full scale rotor blade with an active twist to enhance its capability for vibration and noise reduction. This methodology is based on the 3Dfinite element model, planning of experiments and response surface technique to obtain high piezoelectric actuation forces and displacements wi...

An optimization methodology for the design of a full-scale rotor blade with an active twist in order to enhance its ability to reduce vibrations and noise is presented. It is based on a 3D finite-element model, the planning of experiments, and the response surface technique to obtain high piezoelectric actuation forces and displacements with a mini...

Pultrusion is a continuous and cost-effective process for a production of composite structural components with a constant cross-sectional area. To provide better understanding of the pultrusion processes, to support the pultrusion tooling design and process control as well as to increase a reliability of the simulation results, two alternative fini...

Explicit expressions for the complex longitudinal shear moduli of viscoelastic composites with arbitrary symmetric structure are obtained. Specific formulas of dissipative properties are obtained for tetragonal composites with elliptic and rectangular fibre cross-sections, as well as for hexagonal (not necessarily regular) composites with elliptic...

Traditional description of the rate of the thermoset resin reaction by the Arrhenius relationship multiplied by a reaction function has been used in this study. The Kissinger method and ASTM E 698 procedure have been used for a determination of parameters of the Arrhenius relationship. N-th order, Prout-Tompkins and Kamal-Sourour models have been u...

This paper presents investigation results of the materials designed to protect pipelines against corrosion.

The 25th International Baltic Conference of Engineering Materials & Tribology BALTMATTRIB 2016: Abstracts Book, Latvia, Riga, 3-4 November, 2016. pp.54-54 Pultrusion process could be made more effective applying instead of conventional heaters a high frequency electromagnetic energy source. An effective set up of advanced pultrusion process is not...

Hybrid nanostructured products based on silicate matrix were produced using sol-gel technology from alkali-silicate solutions of polyvalent metal salts with organic oligomer–Epoxy resin ED-20. The possibility of the use of hybrid products as modifiers for the preparation of coatings based on epoxy resin was demonstrated. The effect of the structure...

Damping performance of lightweight composite structures, like fibre reinforced plastics (FRPs) is more efficient than the conventional materials. This phenomena was found valuable in the aerospace and transport industries. For this reason accurate material properties of FRPs are required for precise prediction of dynamic response. However, the give...

The paper deals with exploration of the probabilistic characteristics of the deformed state and stress concentration of a pipeline section with corrosion damage considering its random spatial shape. The investigation was done based on 3D FE models. A special algorithm is developed for the direct solid modeling of the corroded area in the upper surf...

The present book considers the reasons of decreasing maintainability of the oil and gas pipelines. The mechanisms of generation and the features of local corrosive and mechanical damages of the pipes are analyzed. A variety of known in the art methods of internal and surface diagnostics are reviewed. Application of highly promising techniques of th...

The present investigation is devoted to a development of new optimal design concepts of aircraft lateral wing upper covers made of advanced composite materials. In the second part a stiffened composite panel with the best weight/design performance obtained from the linear buckling analysis (Part I) is verified by the nonlinear buckling analysis and...

The present investigation is devoted to the development of a new optimal design of lateral wing upper covers made of advanced composite materials, with special emphasis on closer conformity of the developed finite element analysis and operational requirements for aircraft wing panels. In the first stage, 24 weight optimization problems based on lin...

Pultrusion is a continuous and cost-effective process for a production of composite structur-al components with a constant cross-sectional area. This technological process could be made more effective applying instead of conventional heaters a high frequency electromag-netic energy source characterized by the fast, instantaneous, non-contact and vo...

Pultrusion is one of many composite manufacturing techniques and one of the most efficient methods for producing fiber reinforced polymer composite parts with a constant cross-section. Numerical simulation is helpful for understanding the manufacturing process and developing scientific means for the pultrusion tooling design. Numerical technique ba...

10th International Conference on Composite Science and Technology: Book of Abstracts, Portugal, Lisbon, 2-4 September, 2015. Lisbon: 2015, pp.120-120. Pultrusion is a continuous and cost-effective process for a production of composite structural components with a constant cross-sectional area. In most cases the numerical models of pultrusion proces...

A new procedure has been developed to minimise the influence of the sample imperfections on the identified material parameters by eliminating from the objective function those modes that are mostly affected by the model errors so that eventually no modifications of the numerical model are required. The model errors in the present study are defined...

A mathematical model for the contact interaction of a cylindrical pipe with a composite band during its repair is constructed. A system of governing equations of the contact problem is formulated by using the Timoshenko theory of shells. An analysis of possible solutions is carried out for various combinations of geometric and elastic properties of...

The present investigation is devoted to a development of new optimal design concepts of aircraft lateral wing upper covers made of advanced composite materials. In the first part three rib bays laminated composite panels with T, I and HAT-stiffeners were modeled with ANSYS and NASTRAN finite element codes to investigate their buckling behavior as a...

Inverse techniques based on vibration tests and numerical calculations are sensitive to model errors, which bring discrepancies in the results of the estimated parameters. In the present study model errors related to geometrical simplifications of a laminated plate were investigated experimentally. The investigation focused on the effect that the m...

An inverse technique, based on the planning of experiments and response surface methodology have been applied to determine elastic properties of unidirectional carbon fiber composite plate and carbon nanotubes reinforced aluminium plate. The nuances of application of investigated technique for orthotropic material properties determination are consi...

The present investigation is devoted to the development of new optimal design concepts that exploit the full potential of advanced composite materials in the upper covers of aircraft lateral wings. A finite-element simulation of three-rib-bay laminated composite panels with T-stiffeners and a stiffener pitch of 200 mm is carried out using ANSYS to...

New non-destructive technique, namely an inverse technique based on vibration tests, to characterize nonlinear mechanical properties of adhesive layers in sandwich composites has been developed. An adhesive layer is described as a viscoelastic isotropic material with storage and loss moduli which are both frequency dependent values in a wide freque...

Inverse techniques based on vibration tests and numerical calculations are sensitive to model errors, which bring discrepancies in the results of the estimated parameters. In the present study, model errors related to geometrical simplifications of a laminated plate were considered. The investigation focused on the they have on dynamic characterist...

PO-100, pp.190.

Different nondestructive techniques for the material properties characterisation have been developed and adapted for the testing of nanocomposite samples with small dimensions. There are static approach using three-point-bending test and two dynamic methods, namely, impulse excitation method and inverse technique based on the planning of experiment...

A numerical method combining finite element analysis and a hybrid genetic algorithm is proposed to inversely determine the elastic constants from the vibration testing data. As verified from composite material specimens, the repeatability and accuracy of the proposed inverse determination method are confirmed, and it also proves that the concept of...

pp. 144-145.

paper ID 1540, 2 pages.

The present investigations are focused on the development of an inverse technique based on vibration tests to characterise elastic, hysteretic and viscoelastic composite material properties.

The present investigation is devoted to development of new optimal design concepts that exploit the full potential of advanced composite materials in aircraft lateral wing upper covers. Three rib bays laminated composite panels with T,I and HAT-stiffeners are modelled with ANSYS and NASTRAN finite element codes to investigate their buckling behavio...

A new inverse technique to characterise the nonlinear mechanical properties of viscoelastic core layers in sandwich panels has been developed based on simple vibration tests. The present methodology allows one to preserve the frequency and temperature dependences of the storage and loss moduli of viscoelastic materials for a wide range of frequenci...

Due to development of modern excitation and sensing devices, and new numerical tools for a vibration analysis, significant progress has been achieved recently in the characterisation of dynamic properties of advanced composite structures. To make the results of such analyses more reliable, the influence of errors of experimental and numerical model...

Dynamic and static methods for a non-destructive characterization of the elastic properties of advanced composites are examined in the present paper. A comparative study is done to find out a preferable approach for the characterization of laminated composites depending on laboratory facilities.

The aim of the present work is to investigate the use of Macro Fiber Composite (MFC) actuator for modal analysis of composite plate. Efficiency of application of MFC as an actuator in comparison with the impact hammer, PZT actuator and modal shaker has been investigated. POLYTEC laser Vibrometer operating on the Doppler principle and measuring back...

The solution of the problem of hydrostatic compression of an elastomeric tube is based on the nonlinear theory of elasticity for incompressible materials employing the method of Ritz variations and the ANSYS finite-element solutions. The main purpose of the investigations is to obtain the loading diagrams in the total range of elastomeric tube thic...

New nondestructive technique, namely an inverse technique based on vibration tests, to characterize nonlinear mechanical properties of adhesive layers in sandwich composites is developed. An adhesive layer is described as a viscoelastic isotropic material with storage and loss moduli which are both frequency dependent values in wide frequency range...

Finite element modelling and dynamic analysis of viscoelastic composite structures with high damping properties is performed. The present implementation gives the possibility to preserve the frequency and temperature dependences for the storage and loss moduli of viscoelastic materials and to use the same hypothesis - complex modulus model in the f...

Finite element modelling and analysis of viscoelastic composite structures are performed. The present implementation gives the possibility to preserve the frequency dependence for the storage and loss moduli of viscoelastic materials and to use the same hypothesis - complex modulus model in the free vibration, frequency and transient response analy...

The active twist control of helicopter rotor blades by an application of macro-fiber composite (MFC) actuators leads to significant vibration and noise reduction without the need for complex mechanisms in the rotating systems. For environmental improvement an optimal design methodology based on planning experiments and response surface technique ha...

The present investigations are devoted to the development of new optimal design concepts that exploit the full potential of advanced composite materials in aircraft lateral wing upper covers. The non-linear buckling analysis of three rib bays laminated composite panels with HAT-stiffeners is carried out using ANSYS to investigate an effect of shear...

For reducing the vibration and noise of helicopter rotor blades, the method of their controlled twisting by using built-in deformation actuators is employed. In this paper, the influence of various design parameters of the blades, including the location of actuators made of a piezomacrofiber material, on the twist angle is evaluated. The results of...

This paper presents the use of macro-fiber composites (MFC) for vibration reduces of structures. The MFC consist of polyimid films with IDE-electrodes that are glued on the top and the bottom of rectangular piezoceramic fibers. The interdigitated electrodes deliver the electric field required to activate the piezoelectric effect in the fibers and a...

The vibration of a helicopter has several different sources, such as the rotor, engine and transmission system. This creates a number of problems with performance, for example poor manoeuvrability, discomfort of the pilot, low fatigue life of the structural components, and, consequently, high operating costs. First published online: 14 Oct 2010

An inverse technique based on vibration tests to characterise isotropic, orthotropic and viscoelastic material properties of advanced composites is developed. An optimisation using the planning of experiments and response surface technique to minimise the error functional is applied to decrease considerably computational expenses. The inverse techn...

The design methodology based on the planning of experiments and response surface technique has been developed for an optimum placement of Macro Fiber Composite (MFC) actuators in the helicopter rotor blades. The baseline helicopter rotor blade consists of D‐spar made of UD GFRP, skin made of +450/‐450 GFRP, foam core, MFC actuators placement on the...

The design methodology based on the planning of experiments and response surface technique has been developed for an optimum placement of Macro Fiber Composite (MFC) actuators in the helicopter rotor blades. The baseline helicopter rotor blade consists of D-spar made of UD GFRP, skin made of +45o/–45o GFRP, foam core, MFC actuators placement on the...

The vibration of a helicopter has several different sources, such as the rotor, engine and transmission system. This creates a number of problems with performance, for example poor manoeuvrability, discomfort of the pilot, low fatigue life of the structural components, and, consequently, high operating costs.

In time of helicopter flight, rotor blades produce significant vibration and noise as a result of variations in rotor blade aerodynamic loads with blade azimuth angle. Significant vibration and noise reduction can be achieved without the need for complex mechanisms in the rotating system using active twist control of helicopter rotor blades by an a...

An optimal design methodology based on the planning of experiments and response surface technique has been developed for an active twist of helicopter rotor blades. The active twist control by an application of the macro-fibre composite (MFC) actuators leads to the significant vibration and noise reduction without the need for complex mechanisms in...

Modelling of frequency and temperature dependent VEM layer, sandwich and laminated composites with VEM layers and non-linear vibration of damped sandwich and laminated composites as well as numerical validations of all developed concepts were investigated in this work package.

The purpose of present investigations is a methodology development for the optimal design of large vehicle decks and staircase modules widely applied in ship building industry. Due to large dimension of the numerical problems to be solved, an optimisation methodology is developed employing the method of experimental design and response surface tech...

This paper presents preliminary results about the design and optimization of a model-scale active twist blade actuated by means of Macro Fiber Composites (MFC), as part of the EU-sponsored Friendcopter project for an environmentally friendly helicopter. The capability to numerically characterize induced strain composite beam sections is used in an...

This paper presents preliminary results about the design and optimization of a model-scale active twist blade actuated by means of Macro Fiber Composites (MFC), as part of the EU-sponsored Friendcopter project for an environmentally friendly helicopter. The capability to numerically characterize induced strain composite beam sections is used in an...

Finite element and experimental vibration analyses of viscoelastic composite structures are performed. The present implementation gives the possibility to preserve the frequency dependence for the storage and loss moduli of viscoelastic materials and to use the same hypothesis - complex modulus model in the free vibration, frequency and transient r...

A response of systems with different damping models to transient excitations is studied using the finite element method. For this purpose an efficient method using fast Fourier transform has been developed. This method is based on the trigonometrical representation of the input signals and matrix of the transfer functions. As an example, systems wi...

The methodology based on experimental design and response surface technique is developed for the optimal design of large wheel loaded vehicle decks using the finite element method. The weight optimisation and parametric study are carried out for a sandwich-grillage construction representing the wheel loaded vehicle deck.

A response of systems with different damping models to transient excitations is studied using the finite element method. For this purpose an efficient method using fast Fourier transform has been developed. This method is based on the trigonometrical representation of the input signals and matrix of the transfer functions. As an example, systems wi...

Dynamically loaded structures for high-technology applications generally require high material damping combined with low construction weight and adequate stiffness. Advanced lightweight structures will have to meet not only these dynamic demands but also improved acoustic (low noise) standards. High-performance materials like magnesium, aluminum, o...

The transient response of sandwich beams, plates, and shells with viscoelastic layers under impulse loading is studied using The transient response of sandwich beams, plates, and shells with viscoelastic layers under impulse loading is studied using the finite element method. The viscoelastic material behavior is represented by a complex modulus mo...