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Wyświetlanie 1-15 z 217
Tytuł:
A tool orientation smoothing method for five-axis machining to avoid singularity problems
Autorzy:
Cui, Chuanhui
Zhu, Zhengqing
Chen, Shuai
Zheng, Qiang
Chai, Jinfeng
Li, Xiancai
Powiązania:
https://bibliotekanauki.pl/articles/2200873.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
aeroengine blade
smoothness of tool orientation
five-axis machine tool
singular area
Opis:
In numerically controlled grinding of aeroengine blades, a sharp change in a rotating shaft caused by a singular zone greatly reduces grinding precision and quality. This paper proposes an algorithm to optimize the tool-path that combines optimization of the C-axis rotation angle, a modification to the tool orientation and adjustments to the tool position by taking a four-array machine tool with two rotational axes (B-axis and C-axis) as an example. The algorithm was verified using VERICUT software, furthermore, in machining experiments, the rotation amplitudes of the rotary axis in singular areas was effectively reduced, which ensured grinding quality of blades.
Źródło:
Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 89--102
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of a Carbon Fiber Prosthetic Running Blade for Enhanced Reliability
Autorzy:
Siddiqui, Md Irfanul Haque
Alnaser, Ibrahim Abdullah
Alluhydan, Khalid
Powiązania:
https://bibliotekanauki.pl/articles/28328270.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
mechanical properties
durability
prosthetic design
running blade prosthesis
materials for running blade
reliable
Opis:
This study focuses on the development of a reliable prosthetic running blade primarily composed of carbon fiber. The reliable performance of novel prosthetic running blades has been evaluated by mechanical testing and finite element numerical modeling. Theexperimental analysis confirmed that these blades exhibit superior suitability for high-impact activities, demonstrating reliable load-bearing capacity and effective shock absorption properties. The tensile testing exhibited a linear elastic behavior of the composite material up to a strain of 0.075 mm/mm. Further, it was found that stress concentration areas and fracture points within the blade structure. Furthermore, numerical results revealed a maximum deflection of 29.60 mm that the blade can achieve. The kinetic energy loss during impact demonstrated an 8.5% decrease in blade kinetic energy, with the highest loss occurring at Vy = 30 m/s. Ultimately, this research aims to enhance the reliability, durability, and safety of prosthetic running blades, empowering athletes to reach new heights in sports.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 172668
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Challenges in the design of a new centrifugal fan with variable impeller geometry
Autorzy:
Odyjas, Piotr
Więckowski, Jędrzej
Pietrusiak, Damian
Moczko, Przemyslaw
Powiązania:
https://bibliotekanauki.pl/articles/2204663.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
centrifugal fan
adjustable fan blade
efficiency
field tests
Opis:
This article presents a description of design work for newly created centrifugal fans. This was done based on the example of an innovative solution that uses a change in impeller geometry. In the described solution, this is achieved by shortening and lengthening the impeller blades. The development of a technical solution with such properties requires a change of approach in the design process compared with classic solutions. Therefore, the following text describes this process from the concept stage to demonstrator tests. The principle of operation of such a solution is presented and the assumptions made based on analytical calculations are also described. The text also shows a 3D model of the centrifugal fan with variable impeller geometry, made with the help of computer aided design (CAD) tools. In the further part, numerical calculations were made on its basis. The finite element method (FEM) calculation made it possible to verify the structural strength of the project and its modal properties as well as to verify flow parameters, thanks to the use of computational fluid dynamics (CFD) calculations. The next step describes the procedure for testing centrifugal fans with variable rotor geometry, which is different from that of fans without this feature. The next part presents the results of research from the tests carried out.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 1; 16--27
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of propeller fouling on the hydrodynamic performance of a marine propeller
Autorzy:
Zinati, Ali
Ketabdari, Mohammad Javad
Zeraatgar, Hamid
Powiązania:
https://bibliotekanauki.pl/articles/34602878.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
propeller performances
blade roughness
frictional resistance
CFD simulation
fouling
Opis:
Propeller performance is typically considered under clean conditions, despite the fact that fouling is an inevitable phenomenon for propellers. The main objective of this study is to investigate the effects of roughness due to fouling on the performance of a propeller using a CFD simulation in conjunction with the roughness function model. A simulation of a clean propeller is verified for a five-blade propeller model using existing experimental results. A roughness function model is then suggested based on existing measured roughness data. The simulations are extended for the same propeller under varying severities of roughness. Initially, it is concluded that KT and ηo gradually decrease with increasing fouling roughness, while KQ increases, compared to smooth propeller. For instance, at J=1.2 for medium calcareous fouling, KT is reduced by about 26%, KQ increases by about 7.0%, and ηo decreases by 30.9%. In addition, for the rough propeller, the extra power required is defined as the specific sea margin (SSM) to compensate for the power loss. A slight roughness causes a large decrease in ηo. A propeller painted with foul-release paint and an unpainted propeller are found to require 2.7% SSM and 57.8% SSM over four years of service, respectively. Finally, the use of foul-release paints for propeller painting is strongly advised.
Źródło:
Polish Maritime Research; 2023, 4; 61-73
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of impeller blade rounding and surface roughness on the internal hydraulics and performance of pump as turbine
Autorzy:
Gaji, Rahul
Doshi, Ashish
Bade, Mukund
Singh, Punit
Powiązania:
https://bibliotekanauki.pl/articles/27309885.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
pump as turbine
impeller blade rounding
CFD analysis of PAT
simple modifications in PAT
hydraulic analysis
pompa jako turbina
zaokrąglenie łopatek wirnika
Analiza CFD PAT
proste modyfikacje w PAT
analiza hydrauliczna
Opis:
The Pump As Turbine (PAT) is an important technology for low-cost micro-hydropower and energy recovery, and hence the internal hydraulics of PAT needs to be clearly understood. Additionally, during its operation, the sediments in the water increase the roughness of the internal surfaces and may alter the internal hydraulics and PAT performance similar to a centrifugal pump or Francis turbine. The researchers tried hard to perform simple modifications such as impeller blade rounding to increase the efficiency of PAT. In this paper, the developed test rig is used to analyze the performance of the impeller blade rounding and is validated with a numerical model. This numerical model is further used to study the influence of impeller blade rounding and surface roughness on internal hydraulics and PAT performance. The impeller blade rounding at the most increased the PAT efficiency by 1-1.5 % at the Best efficiency point (Q=16.8 lps), mainly due to the wake reduction on the suction side and increased flow area. With increasing the surface roughness from 0-70 μm, the PAT efficiency is decreased maximum by 4 %. The efficiency was mainly reduced due to increased hydraulic losses at flow zone and disk friction losses at the non-flow zone.
Źródło:
Archive of Mechanical Engineering; 2023, LXX, 2; 219--245
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of the Aerodynamic Characteristics of H-Darrieus Vertical-axis Wind Turbines
Autorzy:
Pavlenkо, Anatoliy
Koshlak, Hanna
Basok, Borys
Novikov, Volodymyr
Powiązania:
https://bibliotekanauki.pl/articles/27315742.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
wind turbine
aerodynamic characteristic
blade profile optimization
Opis:
This article presents a study of the aerodynamic characteristics of a small H-Darrieus wind turbine to optimise its design. The article proposes correlations between the blades' geometric and aerodynamic characteristics, optimising the blades' profile and their dimensions for various values of wind speed, aerodynamic forces, and rotational moments. The data obtained can be helpful in the design and study of low-power wind turbines operating at low wind speeds with variable directions.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 16--24
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The erosion resistance of Cr/CrN multilayer coating deposited using industrial Arc-PVD process for compressor blades application
Odporność erozyjna wielowarstwowych powłok Cr/CrN osadzonych metodą Arc-PVD w warunkach przemysłowych do zastosowania na sprężarki silników lotniczych
Autorzy:
Góral, Marek
Sasiela, Dominik
Płoszaj, Franciszek
Kościelniak, Barbara
Kubaszek, Tadeusz
Przybyło, Adrianna
Powiązania:
https://bibliotekanauki.pl/articles/41156318.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo SIGMA-NOT
Tematy:
PVD coatings
Cr/CrN
Arc-PVD
erosion resistance
compressor blade
powłoki PVD
odporność erozyjna
łopatka sprężarki
Opis:
This study presents the results of a study on the feasibility of using a commercial Cr/CrN multilayer coating to protect the surface of aircraft engine compressor blades made of stainless steel. The research was conducted for coatings composed of 10 and 14 alternating layers of chromium and chromium nitride, respectively. The both variants of coating was manufactured in Ion Galenica Company. Studies of its microstructure showed that their thickness did not exceed 3 μm. Studies of the erosion resistance of both coating variants showed about 50% less weight loss of the samples compared to the material without a protective coating. The highest erosion resistance was found for the 10-layer variant.
W artykule przedstawiono wyniki badań dotyczących możliwości zastosowania komercyjnej wielowarstwowej powłoki Cr/CrN do ochrony powierzchni łopatek sprężarki silnika lotniczego wykonanych ze stali nierdzewnej. Przeprowadzono badania powłok złożonych z 10 i 14 naprzemiennych warstw chromu i azotku chromu, wykonanych w firmie Ion Galenica. Analiza mikrostruktury powłok wykazała, że ich grubość nie przekraczała 3 μm. Badania odporności erozyjnej obu wariantów powłoki wykazały o ok. 50% mniejsze spadki masy próbek w porównaniu z materiałem bez powłoki ochronnej. Największą odporność erozyjną stwierdzono w wypadku wariantu 10-warstwowego.
Źródło:
Ochrona przed Korozją; 2023, 3; 66-70
0473-7733
2449-9501
Pojawia się w:
Ochrona przed Korozją
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultralight and Very Light Helicopter Rotor Data
Autorzy:
Dudnik, Vitaly
Karabut, Victor
Powiązania:
https://bibliotekanauki.pl/articles/36818712.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
ultralight helicopter
main rotor
blade
preliminary design
Opis:
In recent years, a significant number of one- and two-seat lightweight helicopters have come into existence, and this makes it possible to analyse parameters and determine dependencies for this class of helicopters. The knowledge of such dependencies is necessary at the preliminary design stage. The analysis performed in this paper and its comparison with the statistical data of all categories of helicopters made it possible to determine the necessary corrections in the methods of determining the parameters of the helicopter’s rotor systems.
Źródło:
Transactions on Aerospace Research; 2023, 2 (271); 17-24
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new find from the northern border of the Tatra Mountains
Autorzy:
Valde-Nowak, Paweł
Kowal, Magda
Kraszewska, Anna
Skłucki, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/51980780.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Lejowa Valley
quartzite sandstone blade
stray find
Stone Age
Opis:
Despite over a hundred years of various archaeological works, including the latest in Hučiva Cave, considering the presence of Stone age peoples, Tatra Mountains remain an archaeological terra incognita. Therefore it is very important to communicate any new finds. The purpose of this article is to present the discovery from the mouth of the Lejowa valley, found in 2009 in close proximity to the formerly known site no. 1 in Witów, com. Kościelisko. The analyzes of raw material and technological aspect of specimen are presented in this article and can indicate that it was made by Stone Age people.
Źródło:
Acta Archaeologica Carpathica; 2022, LVII; 225-231
0001-5229
2719-4841
Pojawia się w:
Acta Archaeologica Carpathica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aeroacoustic analysis based on FW–H analogy to predict low-frequency in-plane harmonic noise of a helicopter rotor in hover
Autorzy:
Suresh, T.
Szulc, O.
Flaszynski, P.
Powiązania:
https://bibliotekanauki.pl/articles/38695686.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
Lighthill’s analogy
Farassat’s formulation
blade element momentum theory
computational aeroacoustics
computational fluid dynamics
thickness noise
monopole
loading noise
dipole
Opis:
The integral formulation of the Ffowcs-Williams and Hawkings (FW–H) analogy, developed by Farassat (known as Farassat’s formulation 1A), is implemented to study the sound generation and propagation of rotating slender bodies. The general post-processing numerical code utilizes the linear acoustic theory to predict the thickness and loading noise terms for bodies in subsonic motion. The developed numerical code is validated for elementary acoustic sources (rotating monopole and dipole) against analytical solutions. The validated code is then applied for prediction of lowfrequency in-plane harmonic noise (LF-IPH) of a model helicopter rotor of Sargent and Schmitz in a low-thrust hover with full-scale tip Mach number. The required loading distribution of the rotor blade is obtained with CFD (RANS) and Blade Element Momentum Theory (BEMT) methods and also validated against literature data. The developed acoustic code, supplemented by CFD and BEMT loading analyses, allows for a detailed comparison (thickness and loading, near- and far-field, etc.) of the LFIPH noise of a helicopter rotor in both, time and frequency domains. The predicted (FW–H) acoustic signals are compared not only with the reference code solutions, but also with the experimental data. Moreover, the paper quantifies the impact of computational grid density and time-step size (used by CFD and FW–H codes) on the final solution accuracy. Additionally, a simplified analytical code is developed (based on elementary dipole solutions, compact chord assumption and BEMT method) allowing for the initial loading noise analysis with highly reduced computational resources. The acquired results are fully compatible with the classical FW–H analysis in terms of the impact of the in-plane and out-of-plane forces on the generated noise. The FW–H code predictions of the acoustic pressure and its components are in satisfactory agreement with the reference and experimental data of Sargent and Schmitz.
Źródło:
Archives of Mechanics; 2022, 74, 2-3; 201-246
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of geometric errors of throat sizes of last stage blades in a mid-size steam turbine
Autorzy:
Eret, Petr
Hoznedl, Michal
Powiązania:
https://bibliotekanauki.pl/articles/2142353.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
steam turbine
blade throat
3D optical scanning
geometric deviation
Opis:
Steam turbine technology with enhanced flexibility will continue to participate in electric power supply mixes. Last stage blades secure the reliability of a steam turbine and require high precision manufacturing and assembly. This case study presents a statistical analysis of geometric errors of the throat sizes of the last stage blades in a mid-size steam turbine. A 3D optical scanner is employed to capture detailed geometries of rotor blades and a half of assembled nozzle diaphragm. Unrolled cylinder cross-sections are used to evaluate 2D geometrical features such as blade throats and areas at three different diameters, and the results are compared to intended designs. In addition, linear correlations between the throat size and blade pitch, area and trailing edge thickness are established, and blade throat position shifts are quantified. Such a comprehensive study is presented for the first time, and some useful conclusions can be retrieved from this case study.
Źródło:
Journal of Machine Engineering; 2022, 22, 3; 132--147
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
But what doandroids feel about electric sheep? Educating about emotion-related constructs with "Blade Runner"
Autorzy:
Stefanek, Franciszek
Lipka, Justyna
Trynduś, Anna
Powiązania:
https://bibliotekanauki.pl/articles/49355796.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Komisji Edukacji Narodowej w Krakowie
Tematy:
Blade Runner
educational methods
emotions
social psychology
movie pedagogy
metody edukacyjne
emocje
psychologia społeczna
pedagogika
Opis:
The article addresses issues surrounding emotion regulation inthe cult film Blade Runner. The emotional development of the replicants isanalyzed regarding social conditions and the stigma associated with functioning in an ultra- c apitalist dystopia. This article includes aproposal for practical use ofthe film and psychological knowledge toconduct emotional regulation workshops based on the concept ofpsychological work with film.
Artykuł poświęcony jest omówieniu zagadnień związanych z regulacją emocji w kultowym filmie Blade Runner. Rozwój emocjonalny replikantów został poddany analizie z uwzględnieniem uwarunkowań społecznych ipiętna związanego z funkcjonowaniem w ultrakapitalistycznej dystopii. Niniejszy artykuł zawiera propozycję praktycznego wykorzystania filmu iwiedzy psychologicznej do przeprowadzenia warsztatów z zakresu regulacji emocjonalnej, przygotowanych w oparciu o ideę psychologicznej pracy z filmem.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia de Cultura; 2022, 14, 4; 30-44
2083-7275
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia de Cultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational investigation of vibration characteristics analysis for industrial rotor
Autorzy:
Aimeur, Noureddine
Menasri, Noureddine
Powiązania:
https://bibliotekanauki.pl/articles/2204679.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
rotor dynamic
finite element method
reverse design
CMM
unbalanced
blade wear
simulation
ANSYS
Opis:
During the operation of a rotor, various types of vibrations appear in this mechanical system and often limit the performance and endanger the safety of the operation. Therefore, dynamic analysis is essential because precise knowledge of the vibration behaviour is essential to ensure proper operation. This article presents a set of scientific techniques for the modelling and simulation of rotor vibrations. To work out the equations of the vibratory movement of the rotor, we used the energy approach of Lagrange. To achieve this, a model with one blading wheel carried by a shaft supported by two hydrodynamic bearings is chosen basedon the characteristics of the rotor studied (Fan 280 cement draft fan). It is an arduous task to manually ascertain the analytical resolution of the differential equations that characterise the vibratory behaviour of the rotor. The numerical approach employing the finite element method, programmed on the ANSYS software, made it possible to perform the vibration analysis of the rotor. First, the FAN 280 cement draft fan rotor is modelled using SolidWorks 3D software and reverse design using the coordinate measuring machine (CMM) for the design of the fins. Then, the modal characteristics of the fan rotor model were analysed using the finite element analysis (FEA) software ANSYS Workbench. Also, to study the effect of blade wear on critical speeds, the Campbell diagram was obtained. Finally, harmonic analysis was performed to determine the amplitude of the rotor vortex at critical speeds obtained with and without blade wear.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 4; 373--381
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the Geometric Properties of a Jet Engine Fan Blades Based on Modal Vibration Testing
Autorzy:
Osiewicz, Maciej
Cieślak, Sławomir
Bielecki, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/36778970.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
blade vibration
modal analysis
finite elements
design
aviation
Opis:
The article presents an experimental method of determining the geometric properties of jet engine rotor airfoils based on modal vibration testing. The procedure is based on adjusting the results of analytical calculations to the laboratory outcomes. Experimental tests were carried out on a set of 20 jet engine fan blades made of AL7022-T6 aluminium alloy. Each blade differed in weight and geometric dimensions within the accepted design tolerance. Numerical analysis of five airfoils that differed in thickness was performed. Modal vibration test results were summarised and compared with the results obtained by the numerical method. The comparison revealed a high similarity of the frequency and form of vibrations acquired by numerical simulation for each of the blades in relation to the executed vibration testing. Based on the verification of the theoretical model with the results obtained through experimental testing, conclusions were drawn about the object’s dynamic behaviour and its technological quality and geometric properties, whereby each of airfoil was probably thinned.
Źródło:
Transactions on Aerospace Research; 2022, 3 (268); 56-74
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of last stage blade of 13K215 turbine intermediate pressure module
Autorzy:
Bondyra, Radosław
Przytulski, Jan
Dominiczak, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2091352.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
efficiency
strength calculation
steam turbine
last stage blade
fluid flow
calculation
Opis:
Paper is considering the purpose and the process of development of last stage blade for intermediate pressure module of 13K215 steam turbine. In the last 20–30 years most of the steam turbine manufacturers were focused on improving such a turbine mainly by upgrading low pressure module. In a result of such a modernization technology were changed from impulse to reaction. The best results of upgrading were given by developing low pressure last stage blade. With some uncertainty and based on state of art knowledge, it can be stand that improving of this part of steam turbine is close to the end. These above indicators show an element on which future research should be focused on – in the next step it should be intermediate pressure module. In the primary design the height of intermediate pressure last stage blade was 500 mm but because of change of technology this value was decreased to 400 mm. When to focus on reaction technology, the height of the last stage blade is related to output power and efficiency. Considered here is the checking the possibility of implementing blades, in a reaction technology, higher than 400 mm and potentially highest. Article shows a whole chosen methodology of topic described above. It leads through the reasons of research, limitations of 13K215 steam turbine, creation of three-dimensional models, fluid flow calculations, mechanical integrity calculations and proposed solutions of design.
Źródło:
Archives of Thermodynamics; 2022, 43, 1; 45--62
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
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