Stanisław Kachel

Military University of Technology | WAT · Faculty of Mechatronics, Armament and Aerospace

Recently, the so-called fifth generation (5th) aircraft have been introduced into the air forces, including the already implemented American F-22 and F-35, the Russian Su-57 and the Chinese-made J-20. Little is known about the latter, but the first squadron of Su-57 is being formed, which will ultimately replace the fourth generation (4th) Su-35 ai...

The article presents the study of the turbulence model’s influence on aerodynamic characteristics of a cruise missile model obtained during numerical calculations conducted using ANSYS Fluent Release 2023R1 software. Three turbulence models (i.e. Spalart-Allmaras, realizable k-ε and SST k-ω), as well as three computational meshes with a different r...

A model of a cruise missile was tested in symmetrical air flow in a low-speed wind tunnel of the Military University of Technology (Warsaw, Poland). A virtual model of the missile was developed, and the geometry of the computational domain was built in the CAD environment of the ANSYS computational software suite. The domain was discretised in the...

This work is part of a research program aimed at finding new approaches and design solutions for helicopter main rotor modelling using multidisciplinary optimization. It is the fourth stage of an individual research program that includes preliminary tasks such as parametric modelling of a single blade, CFD modelling of a full main rotor for differe...

The aim of this article is to propose methods for obtaining the aerodynamic characteristics of a flying object in a turbulent atmosphere. This article presents static aerodynamic characteristics of an unmanned aerial vehicle (UAV), which have been obtained during experimental examinations and during numerical calculations. The results have been com...

This paper presents an analysis of the causes of damage and fragmentation to the high-pressure turbine (HTP) disc of the RD-33 engine mounted in the MIG-29 aircraft. The authors have carried out an analysis of the changes to the structure of the disc material, both in the areas containing cracks and in the undamaged areas. The impact of structural...

The paper presents selected aspect of the analytical-conceptual research project entitled: Airborne-Rocket Launch System for Delivering Satellite Payloads into Low Earth Orbit – Feasibility Study. The aim of the project is to conduct series of aerodynamic, strength, and aeroelastic simulations of Polish aging combat aircraft (Mig-29 and Su-22) to e...

The traditional and most used method of launching payloads into Earth orbit is to launch a carrier rocket from the surface. An alternative method of space transport is launching payloads into Earth's orbit using air-rocket (air-assisted) systems. The concept of mixed space transport involves launching a space rocket with a payload from an aircraft...

To solve numerically the problem of aeroelastic flutter, two virtual components are required: a structural finite element model (FEM) and an aerodynamic model. MSC Software package containing Nastran with embedded flutter solution enables to perform calculations with the use of an integrated aeroelastic model. For data block including the model and...

This article presents a genetic algorithm modification inspired by events related to great extinctions. The main objective of the modification was to minimize the number of objective function solutions until the minimum for the function was established. It was assumed that, within each step, a population should be smaller than that recommended in t...

Praca podejmuje zagadnienia rozwijane w ramach uczelnianego projektu badawczego realizowanego w Wojskowej Akademii Technicznej w r. 2022 pn. "Metody optymalnego projektowania statków powietrznych w zastosowaniu do poprawy ich własności konstrukcyjnych i aerodynamicznych". Potrzeba prowadzenia badań jest konsekwencją analizy aktualnie eksploatowanyc...

The paper presents the process of designing an unmanned Micro class aircraft, from the analysis of the dynamically developing market and the condition of the Polish Armed Forces to construction of objects and flight test. The possibilities and limitations of using miniature UAVs on the modern battlefield were determined. For the designed UAV the pr...

This paper presents a numerical analysis of the stability of the flow parameters along the intake duct of an aircraft jet turbine engine. This problem has been investigated by many research teams and was included in the literature analysis. The unstable operation of a turbojet intake system can be the consequence of many adverse factors, including...

This work is the preliminary part of a research program which is aimed at finding some new methods and design solutions for helicopter main rotor multidisciplinary optimization. The task was to develop a parametric geometric model of a single-blade main rotor applicable for varied methods of numerical aerodynamic modeling. The general analytical as...

The article is devoted to the preliminary concept of the Future Planetary Defense System (FPDS) emphasizing astroballistics. This paper is intended to support international efforts to improve the planetary security of Earth. The work covers three areas of knowledge: astronautics, astrodynamics, and astroballistics. The most important part of the pr...

The article is devoted to the preliminary concept of the Future Planetary Defense System (FPDS), emphasizing Astroballistics. This paper is intended to support international efforts to improve the planetary security of the Earth. The work covers three areas of knowledge: Astronautics, Astrodynamics, and Astroballistics. The most important part of t...

This work contains the results of a modern helicopter construction analysis. It includes the comparison of almost seventy rotorcraft constructions in terms of size in line with EASA requirements – large and small helicopters. The helicopters are also divided because of a mission purpose. The proposed division for large aircrafts is: transport, mult...

In this paper, a novel method for high temperature fatigue strength assessment of nickel superalloy turbine blades after operation at different times (303 and 473 h) was presented. The studies included destructive testing (fatigue testing at temperature 950 ◦C under cyclic bending load), non-destructive testing (Fluorescent Penetrant Inspection and...

The structural and strength analysis of the materials used to construct an important engine element such as the turbine is of great significance, at both the design stage and during tests and training relating to emergency situations. This paper presents the results of a study on the chemical composition, morphology, and phased structure of the met...

The structural and strength analysis of the material used to construct such an important engine element as the turbine is of great significance, both at the design stage as well as during tests and expertises related to emergency situations. Bearing in mind the conditions above mentioned, the paper presents the results of research on the chemical c...

This paper presents the selected issues regarding the design of a complex object of a turbine jet engine inlet duct model for the purposes of numerical analysis related to the phenomenon of inlet vortex formation. The authors described the process of discretisation in the matter in question and presented certain guidelines for preparing and conduct...

The article describes the proposition for developing the similar dynamically downscaled model of a medium range passenger aircraft and its application for researches in area of aerodynamics and flight dynamics. Computer simulations of aerodynamic flows are commonly used in advanced aircraft designing. Numerous data on the characteristics of an airp...

The article describes the vibration measurement technology used in experimental investigation of light aircraft and some series of exemplary results obtained during the prototyping process. The aim of investigations presented herein was to determine the resonant frequencies and natural modes of an aircraft or its selected structural components. Gro...

Artykuł poświęcony jest budowie modelu łopatki turbiny wysokiego ciśnienia lotniczego silnika turbinowego. Przedstawiono ideę procesu projektowania łopatki turbiny i w tym obszarze parametrów własnych turbiny, które zawarto w analizie charakterystyk turbin. Przedstawiono charakterystyki dotyczące zmian głównych parametrów własnych turbiny, tzn. mas...

Artykuł dotyczy analizy żarowytrzymałych nadstopów przeznaczonych na łopatki lotniczych turbin gazowych. Wieloletni rozwój tych materiałów ma na celu przede wszystkim wzrost odporności termicznej umożliwiającej podnoszenie osiągów silników dzięki wzrostowi temperatury gazów spalinowych przed turbiną. Można zauważyć możliwości materiałowe, aczkolwie...

The article describes the vibration measurement technology used for light aircraft and some results obtained during the prototyping process. The aim of researches was to determine the resonant frequencies and natural modes of an aircraft or its selected structural components. Ground Vibration Testing is an essential dynamic structural test necessar...

In this paper, a fully automated framework dedicated to the high-fidelity multidisciplinary design optimization of aircraft wing is developed. This design framework integrates a set of popular commercial software using their programming/scripting capabilities. It goes through geometric modeling in SIEMENS NX, aerodynamic meshing in ICEM CFD, flow s...

Military University of Technology in Warsaw (MUT) is a military, engineering university operating over 60 years (since 1951). MUT educates students as well as cadets and conducts scientific researches for the needs of the Polish Armed Forces and national economy as well as defence sector. The Institute of Aviation Technology of the Faculty of Mecha...

The article describes the concept of scaled model and its application in the process of real aircraft prototyping. Computer simulations of aerodynamic flows are commonly used in the design of aircraft. Numerous data on the characteristics of an airplane can be obtained using tunnel tests of geometry scaled models. To get complete information in ext...

The design process is no longer a trial-and-error procedure due to the introduction of computer-aided tools and optimization techniques. The product development process is therefore accelerated, allowing to produce more in a relatively lesser time. Moreover, the best possible design, with regard to the performance, can hence be obtained. When appli...

In order to ease modelling procedures, eliminate repetitive effort and save time, modern CAD tools offer the ability to automate tasks via a programming language. Moreover, when the design is an iterative process, the automation permits updating the design variables to generate a new model at each iteration. Based on UG/OPEN GRIP functionalities, t...

This paper describes a wing mass estimation approach based on a bi-level optimization process and an automated CAD-CAE integration framework. The design framework goes through parametric CAD model generation, aerodynamic load calculation, finite element modeling, structural analysis and sizing. In the lower-level task, the wing box is sized to opti...

In order to take advantage of the sophisticated features offered by CAD and CAE packages for modeling and analysis during the design process, it is essential to build a bridge assuring a coherent link between these tools. Furthermore, this integration procedure must be automated so as to get rid of the repetitive costing effort. In this paper, a ne...

Due to the development in computer technology, computational simulations have become indispensable for most engineering system design processes, particularly in aerospace applications. Performing a simulation-driven aerodynamic design optimization is a challenging task due to the computational expensiveness of high fidelity models, the considerable...

Engine mounts are intended to support the engine on the airplane while preventing the engine vibrations from being transmitted to the aircraft structure, and thus have to be designed to follow some structural requirements. In this paper, a structural optimization is implemented for the design of an engine mount planned to be used in a very light ai...

Statistical data clearly points out compressor train outage as one of the main reasons for the breakdown of aircraft power units. Outages are caused by various factors, including material conditions as the main one. Therefore, structural ultimate strength analysis of constructional raw material properties used in the production process of such an i...

In this paper, The Combinatorial-Cyclic method of Optimization (CCOpt) is used to inspect the accuracy of a CMM by analyzing the standard deviation of measurements points on a calibration sphere. A software dedicated to perform sphere fitting and error analysis were developed within the frame of the integrated CAD/CAM/CAE system SIEMENS (GRIP).

Topics below are rather undesired, but important, outcome not yet completed research on the aircraft airfoils, turbine and compressor blades, parametric design of airfoils, establishing the relationships based on the results of experiments in a wind tunnel, developing databases for determining the relationships between airfoil parameters and lift a...

The paper presents a conceptual design for an Unmanned Aerial Vehicle (UAV) of a MINI class, where the aircraft engineering is based on the parametrical approach with use of a master model. In addition, the algorithm for development of a virtual object is outlined as well. It is explained how grids are mapped on the surface of the UAV solid as well...

For the last several years the combinatorial-cyclic method of optimization has been validated and expanded to new areas of applications. Although coordinate measurement analysis still is the main area of applications, the method is becoming a useful and unique tool in design optimization, reverse engineering (parametric design included), and virtua...

The paper presents the methodological approach to development of curves by selection of driving parameters with the application of the method to designing and reproduction of aircraft surfaces on the examples of both newly designed aircrafts and the ones that are already in service. The major assumptions are outlined that are necessary to develop t...

The paper presents the method suitable for optimization of parameters and applied to design aircraft subassemblies on the example of a swept wing. It outlines the assumptions that are necessary to develop a mathematical model and describes constraints that served as the basis to develop an algorithm and describe the corresponding procedures in the...

The paper presents the method suitable for optimization of parameters and applied to design aircraft subassemblies on the example of a swept wing. It outlines the assumptions that are necessary to develop a mathematical model and describes constraints that served as the basis to develop an algorithm and describe the corresponding procedures in the...