State of the art of theory and technology of incremental forming

On the basis of the literature review carried out, the article assesses the current state and development trends of the theory and technology of incremental forming a promising technological process for rapid prototyping of parts from sheet blanks. The basics of the process and the equipment for its implementation, the mechanism of deformation during incremental forming are described. The developed solution for exporting the trajectory of the deforming tool from the CAM to the CAE system is described.

Numerical Analysis on Performance of the Middle-Pressure Jet Grouting Method for Ground Improvement

This study focused on the middle-pressure jet grouting method, which has a complicated development mechanism for the columnar soil-improved body, with the aim of establishing a computer-aided engineering (CAE) system that can simulate the performance on a computer. Furthermore, in order to confirm the effect of middle-pressure jet grouting with mechanical agitation and mixing, a comparative analysis was performed with different jet pressures, the development situation was visualized, and the performance of this method was evaluated. The results of MPS-CAE as one of the CAE systems showed that the cement slurry jet ratio in the planned improvement range, including the periphery of the mixing blade, by the middle-pressure jet grouting together with the mechanical agitation and mixing was increased and a high quality columnar soil-improved body was obtained. It is expected that the introduction of CAE will contribute to the visualization of the ground, and that CAE will be an effective tool for the visual management of construction for ground improvement and the maintenance of improved grounds during the life cycle of the ground-improvement method.

3D MODELING, SIMULATION AND ANALYSIS OF ANTI-VIBRATION BORING BAR

This study presents the capabilities of the engineering dynamic analysis according to the Finite Elements Method (FEM), demonstrated on a 3D virtual prototype of a part "Anti-vibration boring bar" for lathe. The analysis is performed with help of CAE system Ansys. The modal frequencies are determined which are necessary for optimizing the constructive parameters of the product during the design stage.

Аэродинамический профиль в трансзвуковом потоке газа

The subject of investigation in this article is transonic flow. This is a condition in which local speeds of sound are appears on the wing surface, even at the subsonic speed of the nonturbulent flow. As a result, at a certain speed of the incoming flow, the flow regime around the aerodynamic surface will change sharply, which in turn changes the aerodynamic characteristics. Aerodynamic surfaces of the most transport category airplane experience transonic airflow during flight. The goal of the investigation is to study aerodynamic characteristics using numerical methods. The use of numerical methods in the design of aircraft structures is used more and more often to determine the optimal parameters for given operating conditions. This contributes to obtaining a more optimal and perfect design. In this article, we carried out a numerical analysis of the aerodynamic characteristics of airfoils in the transonic flow case using the CAE system CFD ANSYS. As a result of the research, the distributions of the pressure coefficients over the profile surface were obtained. The nature of the flow is obtained, which is similar to the picture of the pressure coefficients for transonic flow in the published sources of this topic. In the area of the middle of the profile, a shock-wave is observed. As a result, the flow around the airfoil changes, which contributes to a change in aerodynamic characteristics. The behavior of the aerodynamic drag and lift coefficients depending on the speed of the Mach number is considered. Also, the position of the center of pressure was analyzed at various velocities of the nonturbulent flow. The calculation was carried out at the cruising altitude of a medium-range aircraft of 11 km. For the calculations, we used the characteristics of the air temperature, the pressure of a given height from the table of the standard atmosphere.

Modeling of range-Doppler images of multicopters, formed by radar with continuous frequency-modulated signal.

The paper presents an approach to modeling of a range-Doppler image of a multicopter, formed in a radar with a wide-band continuous signal. A feature of the approach is taking into account the observation angle, spatial orientation and the current angle of rotation of each of the multicopter propellers, based on wide-band all-angle estimates of their complex-valued reflection coefficients on horizontally and vertically polarized signals, formed using the microwave devices CAE system. The results of simulation of the range-Doppler image of the DJI Phantom 4 multicopter propeller system based on the actual recording of its flight parameters loggeded with the onboard autopilot are presented. Using the proposed model it was defined that the feature of range-Doppler images formed with wide-band continuous radar is the components frequency shifting not only on the Doppler frequency coordinate, but the slant detection range coordinate too.

FEM simulation of bending and torsion tests of similar size RHS but of the different production options

The paper implements a method for analyzing the stress-strain state of rectangular hollow sections (RHS) by finite-element modeling (FEM) of tests for three-point bending and torsion. Design schemes, 3-D solid-state and deformable models have been developed using the automated analysis and CAD/CAE system software, made it possible to obtain equivalent stress distributions and displacements in models. A simulation of tests for RHS with a cross section of 40 mm × 50 mm, manufactured in two ways, was carried out: (a) by direct-forming of galvanized steel strips on roll-forming mill in a semi-closed section with a longitudinal gap of 0.5 mm between the edges formed on a 40 mm web (DF-RHS); (b) similar direct-forming to the closed section and next welding the edges to a longitudinal weld along the web middle of 50 mm (DFW-RHS). RHS with various wall thicknesses (t = 1.93 mm, 1.84 mm and 0.7 mm) was investigated, given the design features that depend on the manufacturing processes of structural sections. It was found DFW-RHS is stiffer by at least 50% compared to DF-RHS, which allows to savings the metal by reducing the RHS wall thickness by 62% while maintaining the same stiffness and ensuring high strength of structural section.

JUSTIFICATION OF THE DESIGN SEQUENCE COMBINED SUPPORTS WITH VARIABLE CHARACTERISTICS

The article presents the sequence of calculating a combined support with variable parameters in the form of an algorithm. The application of the graphical editor of the CAE–system APM Win Shaft for modeling a rotor rotating in combined supports with variable characteristics is described. The results of the calculation module are presented. The obtained Kembel diagrams are considered. An analysis is given to the switching diagrams of a combined support with variable characteristics during operation in transient processes according to a certain algorithm. The presented algorithm eliminates the possibility of increasing the amplitude of oscillations when passing through critical frequencies. Conclusions are drawn about the effectiveness of using the specified sequence of calculations Recommendations are given on the use of the proposed calculation sequence for the design of similar combined supports with variable characteristics.

DIGITAL DESIGNING APPLYING GENERATIVE DESIGN

In this paper the two principal design methods applying in industry such as industrial design and computer-aided design and differences between them were studied. Design technology applying a generative design was considered. The most popular soft ware allowing a generative design realization is a Siemens Software – CAD/CAE-system Solid Edge with a wide range of tools for designing and analysis of new products. Procedure of generative design realization was carried out to determine an optimal geometrical shape of product taking into account specified boundary conditions and load using a CAD/CAE-system Solid Edge. The main goal of generative design is a rational using of source material for a final products manufacturing. When realization of generative design the preliminary analysis of loaded console to refine the values of strength and stiffness took place. Also, with the tool "Generative analysis" the generative analysis for geometrical model was made. As a result was two versions of generative analysis meeting a different requirements of customers. The main tendencies of generative analysis application for designing of a new product with less production and release time were presented.