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Journal of KONBiNNumber of Followers: 4
 Open Access journal ISSN (Print) 1895-8281 - ISSN (Online) 2083-4608
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- The Peculiarities of Applying CAD/CAE Systems for the Primary Combustion
Chamber Flame Tube Cycle Life Prolongation of the Tactical Military
Aircraft Afterburning Turbofan Jet Engine
Abstract: In this article, the computational simulation of the workflow in the primary combustion chamber flame tube of the afterburning turbofan jet engine (ATJE) on the tactical military aircraft was carried out. The geometric model of a flame tube was created and adapted to perform the interrelated calculation of the thermal and stress-strain behaviour of the walls of the flame tube influenced by the operational loads during the computational simulation of the workflow. Quantitative and qualitative analysis of the simulation results was conducted, and the connection between the peculiarities of the workflow and the characteristic damage of the flame tubes, detected during the operation, was established. The possibility of using modern CAD/CAE systems to solve the scientific tasks towards maximizing the cycle life potential of the main and primarily important components of the ATJE on the assessment basis of their damage exhaustion degree was determined.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Actions of the aviation on-board fire protection system caused by short
circuits in control blocks
Abstract: The article presents the results of simulation tests of the SSP-FK aviation fire protection system and identification of the main reasons of its false operation on many aeroplanes and helicopters of the Polish Armed Forces using a diagnostic simulator built at ITWL. The results of the performed statistical analyzes pointing to the execution blocks as the key factors in false fire signalling are discussed. Selected test results of the developed simulation model of the actuator block under electrical short-circuit conditions in its control circuits (particularly on printed circuit boards) are presented. The effectiveness of the proposed test method with a simulation model of a fire protection system, which can be used to train the engineering and aviation service and pilots and to support the work of the Aircraft Accident Investigation Commission, was pointed out.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Analysis and Evaluation of the FA-50 Capabilities for the Polish Air Force
Abstract: FA-50 aircraft is a combat version of the KAI T-50 Golden Eagle jet trainer. The development of the FA-50 combat aircraft began in October 1997.The development phase finished in January 2006, during which 6 prototypes were built. It is worth noting that in October 2012, the FA-50 was awarded a military certificate issued by the Korean MAAC (Military Aircraft Airworthiness Committee) as the first military fighter-class aircraft. On 16 September 2022, the approval ceremony for purchasing the FA-50 by the Polish Air Force took place at the 23rd Tactical Air Force Base in Mińsk Mazowiecki.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Statistical Procedures for State Degradation Testing by Vibration Methods
Abstract: This paper presents selected problems of the statistical evaluation of machines with the use of vibration diagnostics methods. The state of knowledge of this issue indicates the need to update the description and improve the issues related to the acquisition and processing of data, the analysis of the effectiveness of diagnosis procedures, optimization of the set and selection of diagnostic parameters, with statistical support. New proposals of statistical software solutions and various aspects of theoretically justified partial procedures indicate important problems for a good diagnosis.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Computer Aided Design Process for Hydraulic Servo
Abstract: This study presents a method of computer support for the design of a hydraulic servo dedicated to the aircraft control system. A 3D geometric model of the servo was developed, which enabled the simulation of its kinematics. The paper presents a simulation model of a hydraulic servo that enables simulation of the dynamics of its mechanisms. The servomechanism model takes into account the dynamics of the movement of the distributor slider and the dynamics of the actuator piston rod movement under the influence of forces occurring in the servo. As a result of the simulation, step characteristics and static characteristics of the servo response were obtained. The presented model makes it possible to visualize the dynamics of operation of the prototype servo in various modes of its operation with different parameters of its control. It allows you to quickly and conveniently test the concept of an hydraulic servo and evaluate its functioning.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Selected aspects of a movable shooting system of the Mi-24 helicopter
Abstract: Controlling a mobile shooting system with a tracking system raises concerns regarding mechanics, automation and electrics. Significant acceleration of the helicopter assembly platform involves continuous oscillations in all directions, which increases the dynamic error. Currently, only the static error is checked during maintenance, which does not consider the conditions during the flight. Furthermore, ageing processes, especially those of mechanical elements, deepen the oscillation of the tracking system of the mobile shooting system. The authors present a proposal deemed for improvement, thanks to low-cost remedial measures and the system’s stability by taking into account dynamic errors.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- The Process of Acquiring, Collecting, Processing and Archiving Data for
the SHM System Designed to Identify Defects in Thin-Walled Structures
Abstract: The article shows the results of the preparatory steps taken to create the artificial intelligence used in the automatic recognition of defects in ship thin-walled structures. The above steps are used to create a university private cloud and a computer system maintaining a dataset of vibration signal samples. In the article, a prototype of the private cloud was designed and developed, a model of the vibration sample was prepared, and a microservice was designed aimed at sharing the obtained data. The article demonstrates the results of the completed development.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Pilots’ Gaze Behavior in Simulation Research
Abstract: Effective processing of information from the sense of sight affects the efficiency and safety of flight operations. Differences in visual behavior between pilots with varying levels of flight experience during basic flight maneuvers were identified as the research problem. Twenty-six pilots participated in the study and were divided in terms of flight experience. The participants’ visual behavior was recorded using a Pupil Invisible eye tracker. The test subjects’ task was to take off from Poznań-Ławica airport, climbing to 2000ft and making two turns. The results of the study suggest that performing basic maneuvers develops strategies for scanning the cockpit space. It is advisable to conduct further research taking into account the division of experts into groups with varying numbers of flying hours.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Identification of Geological and Engineering Conditions for Forging the
Bed of a Large Lowland River, Based on Low-Ceiling Aerial Photographs
Abstract: The article outlines the possibilities for assessing geological conditions related to fording the beds of large lowland rivers, based on low-ceiling ad hoc aerial photos, and the current state of the art on the utilization of remote-sensing methods in geological and engineering studies. The conducted research provided a confirmation that a set of remote-sensing sensors installed onboard an aerial vehicle enables recording images, the analysis of which allows determining the geological and engineering conditions of lowland riverbed zones, to the extent adequate to make decisions on crossing them.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Technology of Making Airfield Pavements in Relation to the Existing
Requirements in Terms of Texture
Abstract: The assessment of the texture of airfield pavements, in addition to assessing their roughness, is a component of the broader concept of anti-skid properties, which significantly affect the safety of air operations. The roughness of the pavement directly affects the adhesion of the aircraft tire to the pavement, and the texture additionally affects the effectiveness of dynamic drainage of water from the pavement. The current standard requirements in terms of roughness and texture of airfield pavements do not distinguish the technology used. In the paper, the authors focused on the analysis of the results in terms of the texture of airfield pavements and presented the resulting conclusions in relation to whether the technology of its implementation has an impact on the texture parameter.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Ground power unit LUZES as an experimental platform for studying defects
for the FAM-C method
Abstract: This article addresses studies of basic mechanical defects conducted with the proprietary FAM-C method on a test bench created on the basis of ground power unit LUZES. The following mechanical defects were modelled in laboratory conditions: skewed connections, eccentricity of connections, increased circumferential clearance, increased intertooth clearance, etc. The thesis was put forward that tests on LUZES equipment enable to transfer experience onto the more complex helicopter power unit. The aim is the early defect detection of these units.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Simulation of Current Distribution Through Elements of the Overhead
Contact Line
Abstract: The compilation of unfavourable weather conditions, such as negative temperature and high humidity, leads to the formation of an ice layer and deposits on the elements of the overhead contact line, which leads to its degradation and prevents the supply of electricity to the traction vehicle. The traction line is located on a very large area and it is extremely difficult to effectively remove the remaining layers of ice. During planning the anti-icing measures it’s very important to know the current distribution in wires. The authors of the article analysed the catenaries operated in Poland and in EU in terms of the current distributions in contact and catenary wires in through spans. The approach presented in this paper allows to take into account the wear of the contact wires during calculations of the current distributions.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- An Application of the Pythagorean Fuzzy Sets in the Fault Diagnosis
Abstract: In this paper, a comprehensive review and critical analyses of methods based on the ordinary fuzzy set, Atanassov’s intuitionistic fuzzy set, and its extensions have been conducted to show their limitations and defects. Then, a novel similarity measure based on the generalized score function has been introduced that incorporates the significance (importance) of information, making it more intuitive to compare them. The proposed method is employed for the fault diagnosis of steam turbine generator unit under Pythagorean fuzzy environment. Ten fault types of rotating machines are established as failure patterns in nine different vibration frequency ranges, expressed in terms of Pythagorean fuzzy numbers. The superiority of the proposed method in dealing with uncertain and vague information is shown by comparing it with some existing measures in numerical examples.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Preliminary Studies on the Purification of Bleaching Earth from Slack Wax
Residues in the Adsorption Refining by Low-Temperature Pyrolysis Process
Abstract: The essence of the low-temperature pyrolysis process presented below is the processing of contaminated bleaching earth, resulting in a purified bleaching earth, high calorific oil with an average level of 45.5 MJ / kg and synthesis gas that can be used to heat the reactor. For research purposes, a proprietary low-pressure reactor with a system of direct cooling of hydrocarbon vapors was used. The main advantages of the presented method are the limitation of technological processes to a minimum and the ease of automation by reducing the entire cycle to one device.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- Influence of the Numerical Modelling Methods on Dispersions and Errors of
Analysis Results of Ship Hull and Deckhouse Vibrations
Abstract: Ships’ (especially containers) vibrations significantly impact navigation safety. The presented analyses aims to identify the main forces exciting the ship’s superstructure and hull vibrations, test their influence on vibration levels, and verify the assumptions of the computational methodology. Two container ships were analysed. The influence of different modeling methods on the obtained calculation results was investigated. The impact of various operating parameters on the vibration level was also analysed. The numerical analyses results are compared with some empirical formulas. As a result, the calculation confidence level was estimated. The calculation results have been verified by comparison with measurement tests carried out on the real ship.
PubDate: Wed, 07 Dec 2022 00:00:00 GMT
- False actions of the aviation fire protection system caused by
disturbances in power circuits
Abstract: The article presents the results of simulation tests of the SSP-FK aviation fire protection system and the identification of the main causes of its false operation on many airplanes and helicopters of the Polish Armed Forces with the use of a diagnostic simulator built at ITWL. The results of the performed statistical analyzes pointing to the execution blocks as the key factors in false fire signaling are discussed. Selected test results of the developed simulation model of the actuator unit under the conditions of disturbances occurring in its supply circuits (in particular instantaneous voltage drops) are presented. The effectiveness of the presented test method with the use of a simulation model of a fire protection system, which can be used to train the engineering and aviation service and pilots, and to support the work of the Aircraft Accident Investigation Commission, was pointed out.
PubDate: Thu, 22 Sep 2022 00:00:00 GMT
- Case Study of the Psychophysical State of Student-Operators During UAVO
Training, Based on Heart Rate Parameter
Abstract: This article focuses on the human factor in UAV operations. In the manuscript, research on the psychophysical state of student-operators under the license of UAVO VLOS <4 kg. For the analysis of the psychophysical state, the pulse parameter was used, which is one of the values that describe the work of the cardiovascular system and is one for the objective methods of assessing the psychophysical state of a human being. The data collected were analyzed using the STATISTICA software. The article focuses on the above aspect and analyzes the psychophysical state of the student-operator during flight training. The obtained results were also related to research on similar topics in the chapter discussion section.
PubDate: Thu, 22 Sep 2022 00:00:00 GMT
- Influence of the Bird Model Shape on the Results of Numerical Analyses of
Bird Models Impact Against a Rigid Plate
Abstract: This paper presents results of numerical analyses of different bird models impacting a rigid plate. The results of the study were compared with findings derived from experimental research. The experimental studies were conducted using a dedicated gas gun kit. A gelatine projectile was used as a bird model, giving it a speed of 116 m/s. For the purpose of the numerical investigations, the authors used the LS-DYNA software package. It is a computational code for the analysis of fast-variable phenomena using different methods, such as Lagrange, Arbitrary Lagrange-Euler (ALE), Smoothed Particle Hydrodynamics (SPH). Three cylindrical bird models with different endings were developed using the SPH method. The shape of the end of the bird model was found to exert a significant effect on the Hugoniot pressure values. However, it does not affect the maximum value of the impact force. The differences only occurred at the initial moment of impact, which was related with the area of contact between the model end and the target.
PubDate: Thu, 22 Sep 2022 00:00:00 GMT
- Quantitative Assessment of the Influence of Plasma Hardfacing Parameters
on the Metallurgical Melting of an Austentic Steel Coating with a
Substrate Material Made of C45 Steel
Abstract: In this paper, based on a quantitative analysis of the parameters of plasma hardfacing of C45 steel with CastoMag 45554S wire, an optimisation of the hardfacing process parameters has been carried out. Experimental researches were carried out on the basis of an orthogonal plan, and the optimum hardfacing parameters, e.g.: intensity, voltage, wire feeding speed, were determined by the multiple regression method and the Taguchi method. It was found that the main current of the plasma arc had the greatest influence on the value of the fusion index. The highest S/N value was obtained for the following parameters: I = 120 A, U = 31 V, vn = 0.75 m/min, vd = 3.9 m/min, z = 12 mm.
PubDate: Thu, 22 Sep 2022 00:00:00 GMT
- Developing Technology for the Welding of Steam Turbine Steering Diaphragms
Using the Submerged Arc Welding Method
Abstract: The production process of steam turbine steering disks requires many welded joints of high quality parameters. The article presents the test results obtained in the welding process of elements made of martensitic steel X11CrMo12-1 with a thickness of 160 mm. During the tested process, a weld was made with a welding wire filling with 1% and 9% chromium in the K geometry, a groove height of 65 mm and without full penetration. The research was carried out on a butt joint in a downward position. The joint was subjected to destructive and non-destructive tests, including macroscopic tests. This work was aimed at determining the optimal welding parameters, influencing the improvement of the properties and quality of the joint..
PubDate: Thu, 22 Sep 2022 00:00:00 GMT
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