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Wyświetlanie 1-15 z 108
Tytuł:
A rescue shot – resolving hostage situations in police operations
Autorzy:
Jałoszyński, Kuba
Powiązania:
https://bibliotekanauki.pl/articles/1878678.pdf
Data publikacji:
2013
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Tematy:
rescuing shot
shot on command
law
Opis:
The issue of a rescue shot and a shot on command is a matter that presently needs a more precise legal definition. The author presents the issue, which requires a most urgent solution, while comparing it with relevant regulations in the United Kingdom, the Netherlands, Germany and Spain. Thus he provides a broad picture of possible solutions to the critical problem of a rescue shot and a shot on command.
Źródło:
Security Dimensions; 2013, 10(10); 29-34
2353-7000
Pojawia się w:
Security Dimensions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Współczesne oczyszczarki strumieniowo-ścierne Część III. Analiza pracy turbin śrutowniczych
Contemporary shot-blasting machines. Part III. Analysis of the operation of shot-blasting turbines
Autorzy:
Woźniak, K.
Powiązania:
https://bibliotekanauki.pl/articles/404593.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo AWART
Tematy:
abrasive shot-blasting machine
shot
shot blasting turbine
shot blast
oczyszczarki wirnikowe
obróbka strumieniowo-ścierna
strumień śrutu
Opis:
This paper is the third part of a larger study presented in previous editions of the quarterly. It presents the factors that determine the efficiency of abrasive blast cleaning. The selection of the right shot-blasting machine and the correct selection of the parameters of its work, in addition to the appropriate parameters of the air circulation in the paver, guarantee the achievement of the assumed effects of abrasive shot blasting. The information presented in this part of the study enables the selection of such parameters.
W części II opracowania [10] stwierdzono, że turbina śrutownicza jest „sercem” współczesnych oczyszczarek wirnikowych. Z tego powodu wybór właściwej śrutownicy i dobre dobranie parametrów jej pracy, obok odpowiednich parametrów obiegu powietrza w oczyszczarce, jest gwarantem uzyskania założonych efektów obróbki strumieniowo-ściernej. Analiza, przedstawiona w tej części opracowania, umożliwia taki właśnie wybór.
Źródło:
Obróbka Metalu; 2018, 1; 52-57
2081-7002
Pojawia się w:
Obróbka Metalu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Współczesne oczyszczarki strumieniowo-ścierne Część II. Budowa turbin śrutowniczych
Present-day abrasive jet cleaning machines. Part II. Construction of shot jet turbine
Autorzy:
Woźniak, K.
Powiązania:
https://bibliotekanauki.pl/articles/404487.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo AWART
Tematy:
abrasive
shot
cleaning machine
shot jet turbin
Opis:
Shot jet turbine are the basic component of rotor cleaning machines system. Creating of abrasive jet which machining surface stroke is determined by constructional structure of turbine throwing rotor. Operational features of abrasive jet – directly and indirectly – results of abrasive jet machining depend on rotor constructional structure and machining operational parameters. In the paper principle of turbines operating and their constructional structure. Structure of their main units and elements is described too.
Podstawowym składnikiem instalacji oczyszczarek wirnikowych są turbiny śrutownicze [14]. Za tworzenie strumienia ścierniwa, który uderza w obrabianą powierzchnię, odpowiedzialny jest wirnik rzutowy turbin. Od budowy wirnika i parametrów jego pracy bezpośrednio zależą właściwości roboczego strumienia ścierniwa, a pośrednio – efekty obróbki strumieniowo-ściernej. Poniżej przedstawiono zasadę działania turbin, ich strukturę konstrukcyjną. Opisano także budowę głównych zespołów i elementów turbin.
Źródło:
Obróbka Metalu; 2017, 4; 28-34
2081-7002
Pojawia się w:
Obróbka Metalu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The numerical fem model of the kinematics of the vibratory shot peening process
Autorzy:
Bławucki, S.
Zaleski, K.
Powiązania:
https://bibliotekanauki.pl/articles/102472.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
vibratory shot peening
FEM
vibratory shot peening kinematics
efficiency of vibratory shot peening
Opis:
The paper presents the results of numerical calculations, with the finite element method in the ABAQUS program environment, of the vibratory shot peening process with loose peening elements. The behaviour of shot peening elements was analysed in the kinematic aspect. The impact of the initial deployment of vibratory shot peening elements on their behaviour during processing was investigated, including the displacement, velocity, acceleration and the number of collisions. The way of determining the effectiveness of the processing with the vibratory shot peening was illustrated.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 260-269
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Single-Stage and Duplex Shot Peening on Surface Roughness and Residual Stresses in Al Mg5 Mn1 Sc0,8 Zr0,4 Alloy
Autorzy:
Byczkowska, P.
Sawicki, J.
Januszewicz, B.
Stegliński, M.
Powiązania:
https://bibliotekanauki.pl/articles/353741.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
shot peening
double shot peening
residual stresses
roughness
Opis:
Conventional shot peening (SP) is cheap surface treatment widely used to enhance fatigue life of mechanical components [3,4]. Basically, it is shooting small particles (shots) on the surface of the sample. However, the process itself is so complex that a lot of companies are not able to optimally employ it due to the amount of parameters that must be controlled all at the same time. The duplex process consists in two stages of shot-peening treatment. The first one consist of shot-peening with spherical cast steel shots or cut wire shots. During the second stage the samples processed in stage one were subject to shot-peening with glass beads. In this work, RSA-501 aluminium alloy was shot peened using shots of different material and diameter and tested using a measurement of residual stresses and surface roughness. Tests and studies conducted so far on RSA-501 aluminium alloy demonstrate that bombardment by a treatment medium in the form of glass beads or shots of various shapes and diameters induces permanent plastic deformation of the surface layer. The roughness achieved after the shot-peening process was determined for each treatment medium. The largest value of Ra parameter was achieved for cut wire shots and this result is consistent with the above-mentioned theoretical knowledge. This medium is the most aggressive one to the surface being treated primarily due to the sharp edges of shots. The duplex process was successful in obtaining higher values of compressive stresses in surface layer than values achievable in conventional single-stage shot peening process.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 505-511
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the impact of double shot peening on the value of roughness parameter and distribution of stresses in the RSA 501 alloy
Autorzy:
Byczkowska, P.
Sawicki, J.
Januszewicz, B.
Stegliński, M.
Powiązania:
https://bibliotekanauki.pl/articles/957816.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
shot peening
double shot peening
surface treatment
residual stresses
roughness
Opis:
The bead blasting process is widespread in both the automotive and aerospace industry and is performed in order to improve the fatigue strength of various components. Bead blasting is a cold plastic forming process during which the surface of the material processed is hit by small, hard particles consisting of steel pellets, bearing balls or glass beads. It increases the hardness of the outer layer and establishes compression stresses inside it, which is why this processing is often used to improve fatigue strength. Contrary to other peening methods, bead blasting does not result in a reduction in the height of the processed surface’s unevenness in most cases. Shot peening changes the residual tensile stresses into residual compression stresses, thanks to which, the lifetime of the parts processed is extended and their carrying capacity is increased. The double shot peening process proposed by the authors consists in a two-stage bead blasting process. The first stage consists in blasting with round cast steel pellets, pellets cut from wire or cast iron pellets. During the second stage the same samples underwent glass bead blasting. The tests conducted on the RSA-501 aluminum alloy indicate that as a result of the processing medium’s impact in the form of glass beads or pellets of different diameter and shape, a permanent plastic deformation of the material surface occurs. On the basis of the obtained results it is possible to infer that the choice of parameters of both conventional shot peening and the double shot peening determine the impact thereof on the material’s mechanical properties. Thanks to the application of the double shot peening process there is a noticeable decrease in value of the Ra parameter, by about 40% on average. When analyzing the compressive stress results it is possible to state that after the first blasting process the value of stress was increasing when moving deeply into the sample from its surface, while after the glass bead blasting the value of compressive stress was significantly higher already near the surface. Double shot peening results in an increase in the value of compressive stresses by 40-50% when compared to conventional blasting.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 3; 1-9
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materiały ścierne stosowane we współczesnej obróbce strumieniowo-ściernej
Abrasive materials used in contemporary abrasive-jet technologies
Autorzy:
Woźniak, K.
Powiązania:
https://bibliotekanauki.pl/articles/404517.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo AWART
Tematy:
abrasive jet machining
shot
shot's selectio
obróbka strumieniowo-ścierna
ścierniwo
uderzenie strumienia powietrza
Opis:
In this paper the beginnings of abrasive-jet machining were described, diagrams of installation of the first patents for this treatment were also included. Shots as a working media in these methods were classified. Domestic and international standards, describing all media and methods of their research were discussed. Characteristics of currently used shots were given, the rules of their selection for the processing of specific metals was described.
Obróbka strumieniowo-ścierna jest powszechnie stosowaną metodą obróbki powierzchni różnorodnych przedmiotów. Zgodnie z definicja zawartą w PN-EN ISO 8504-2:2002 obróbka strumieniowo-ścierna to „uderzanie strumieniem ścierniwa, charakteryzującego się wysoką energią kinetyczną w powierzchnię, która ma być przygotowana”. Czynnikiem rzucającym ścierniwo na obrabiana powierzchnię jest sprężone powietrze, woda lub siła odśrodkowa koła rzutowego śrutownicy.
Źródło:
Obróbka Metalu; 2017, 1; 34-42
2081-7002
Pojawia się w:
Obróbka Metalu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Reacting of Gun Shot Residues in the Dependence on the Gun Barrel Lenght
Autorzy:
Svachouček, V.
Svachoučková, P.
Velehradský, L.
Ventura, K.
Powiązania:
https://bibliotekanauki.pl/articles/358826.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
gun shot residues
ammunition
analysis
Opis:
Currently, the study of gun shot residues constitutes a wide and a very interesting problem as from the shooter´s view so as from the design enginneers´ view and furthermore possibilities, which infuence the conditions of the products formation process. Currently, one direction of the investigation of gun shot residues proceeds the study of morphology and thereby even possibilities of improvement of frm particles and further physical conditions, which infuence for instance on their stability in the surveyed environment or scatter particles. This problem is investigated by research police institutes above all. The detection of the shot place from the specifc cartridge of a concrete weapon is the objective of their investigation. The lay formation of gaseous gun shot residues and their possible toxicity is interesting from the gunner´s view. We have been dealing with this problem for 5 years. This research paper is intented the problem of the dependence of composition of gaseous gun shot residues on the gun barrel lenght.
Źródło:
Central European Journal of Energetic Materials; 2009, 6, 2; 211-216
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Shot Peening on Abrasion Wear in Real Conditions of Ni-Cu-Ausferritic Ductile Iron
Autorzy:
Wieczorek, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/350866.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ADI
shot peening
wear
abrasion
Opis:
The paper presents results of the wear tests of chain wheels made of austempered ductile iron with various content of residual austenite. The aim of this study was to demonstrate the impact of the dynamic surface treatment (shot peening) on wear properties of surface layers of the chain wheels tested that were subjected to the action of quartz abrasive. Apart from determining the value of the abrasive wear, examinations of the magnetic phase content in the microstructure were carried out and plots of hardness of the surface layer as a function of the distance from the surface and microstructure of the materials were prepared. Based on the results, the following was found: an increase in the abrasive wear and a reduction in the hardness of the surface layer of chain wheels subjected to shot peening, as well as reduction of susceptibility to negative action of the shot for cast irons with the structure of upper ausferrite.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1985-1990
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameters selection of shot peening gears of carburized and hardened steel 21NiCrMo2
Autorzy:
Tchórz, T.
Śnieżek, L.
Grzelak, K.
Mierzyński, J.
Powiązania:
https://bibliotekanauki.pl/articles/245218.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
materials engineering
shot peening
vehicles
gears
Opis:
This article presents the methodology of shot peening gears’ parameters selection used in agricultural tractor transmission. The gears made of steel have been treated with 21NiCrMo2 thermal-chemical consisting of carburization to the depth of 0.8 mm and subsequently hardened. The hardness of the side teeth surface after hardening was 58 HRC. The same process of thermo chemical was used for flat samples with dimensions 120×12×5 mm. Prepared samples were divided into two series. First shot peening was treated with spherical pellet with a varied diameter from 0.4 mm to 2.5 mm. For second series samples additional treatment of shot peening was not carried out. Then micro-hardness, roughness and longitudinal and transverse residual stresses were measured. As a result of the studies, there were selected parameters of shot peening, exerting the greatest influence on favourable residual stresses distribution in the surface layer of material and an increase in microhardness. At the same time, particular attention was paid to the morphology of samples surfaces after shot peening. There were rejected the parameters of shot peening, which caused damage to the surface in the form of visible cracks and craters. Based on the analysis presented in this article there were selected shot peening parameters, which will be applied during the additional dynamic surface processing of gears, used in the tractor’s drive system.
Źródło:
Journal of KONES; 2016, 23, 2; 389-395
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability of complex system with one shot items
Autorzy:
Vališ, D.
Powiązania:
https://bibliotekanauki.pl/articles/2069607.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
complex system
one shot item
Opis:
This article deals with modelling and analysis of the reliability of complex systems that use one-shot items during their operation. It includes an analysis of the impact of the reliability of used one-shot items on the resulting reliability of the system as a whole. Practical application of theoretical knowledge is demonstrated on an example of a model of reliability of an aircraft gun that was used for optimization of the gun’s design during its development and design. The analysed gun uses two types of one-shot items – rounds intended for conducting of fire and special pyrotechnic cartridges designed for re-charging a gun after a possible failure of the round.
Źródło:
Journal of Polish Safety and Reliability Association; 2007, 2; 347--354
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the conditions of shot peening the Inconel 718 nickel alloy on the geometrical structure of the surface
Autorzy:
Zaleski, K.
Skoczylas, A.
Brzozowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/102751.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
surface roughness
shot peening
Inconel 718
Opis:
This article presents the research results of roughness and topography of the surface of Inconel 718 nickel alloy after shot peening. The evaluation of stereometric properties of the surface layer of the examined material was performed based on the amplitude, height and Abbott-Firestone curve parameters. The shot peening was carried out on the impulse shot peening stand. The impact energy Ez, distance between the traces xs and the ball diameter dk were changed in the range: Ez = 60 ÷ 240 mJ, xs = 0,15 ÷ 0,5 mm, dk = 3,95 ÷ 12,45 mm. The T8000 RC 120-140 device of the Hommel-Etamic company, along with the software, was used for measuring the surface roughness and for determining the material bearing curve. As a result of the machining, the surface roughness was reduced and the selected functional parameters were improved.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 2; 205-211
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shot Peening of a Mg-Al-Zn-Mn Alloy Surface
Autorzy:
Kottfer, D.
Mrva, P.
Powiązania:
https://bibliotekanauki.pl/articles/403372.pdf
Data publikacji:
2010
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
materials technology
shot peening
functional surface
roughness
Opis:
The paper describes the influence of shot peening on Mg-Al-Zn-Mn alloy surface. There are estimates focusing on the roughness of the shot peened surfaces and size of the selected shot peened material - corund. Based on the results of measurements, the evaluation was oriented on the curve of roughness, functionality of surface roughness Ra and the necessary quantity of shot peening material qnR of estimated material depending on the grain size dz.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2010, 1, 1 (1); 21-29
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacja sił mięśniowych kończyn dolnych podczas pchnięcia kulą
Simulation of muscle forces in lower extremities while shot putting
Autorzy:
Łysoń, B.
Kwacz, M.
Błażkiewicz, M.
Wit, A.
Powiązania:
https://bibliotekanauki.pl/articles/99362.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
OpenSim
pchnięcie
kula
symulacja
push
shot
simulation
Opis:
W pracy wyznaczono czasowe przebiegi sił mięśniowych kończyn dolnych za pomocą modelu matematycznego u sportowca wykonującego pchnięcie kulą. Szczegółowo przedstawiono proces generowania symulacji w programie OpenSim na podstawie danych pochodzących z systemu Vicon Nexus. Zdefiniowany model ukazał, które mięśnie generują największą siłę w trakcie wykonywania ruchu pchnięcia kulą oraz które mięśnie pracują w warunkach ekscentrycznych. Istnieje możliwość wykorzystania wygenerowanego modelu do dalszych symulacji mających na celu szczegółową analizę techniki wykonywania pchnięcia kulą.
Time trajectories of muscle forces for an athlete performing the shot put were modeled in the following article. The process of generating simulation in OpeSim software based on Vicon Nexus system data was presented in detail. The generated model showed which muscles generate the highest force while performing the movement of the shot put. It was also presented which muscles are working in eccentric conditions, which may cause injury. There is a possibility to use the generated model for further simulations, in order to conduct detailed analysis of shot put technique.
Źródło:
Aktualne Problemy Biomechaniki; 2015, 9; 73-78
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of vibration shot peening parameters upon shapes of bearing curves of alloy steel surface
Autorzy:
Zaleski, K.
Skoczylas, A.
Powiązania:
https://bibliotekanauki.pl/articles/102198.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
vibration shot peening
bearing curve
surface roughness
Opis:
The article presents the results of studies on the effect of technological parameters of vibration shot peening upon the shape of bearing curves and the parameters of that curve. The topography of surface formed in result of vibration shot peening and pre-machining, which was grinding, were analyzed. The material used in the studies was alloy steel 30HGSA. The shot peening process was performed on an appliance equipped with a kinematic vibrator. Shot peening time t, vibrator oscillations (vibrations) frequency ν, as well as vibrator oscillations amplitude A were changed within: t = 1–15 min, ν = 17,5–35 Hz, A = 10,3–17,3 mm. For measuring surface roughness and determining the bearing curve the appliance T8000 RC120-400 by Hommel- Etamic was used together with the software. In result of the machining performed surface roughness decreased, and the parameters of bearing curve improved.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 25; 20-26
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 108

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