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Wyszukujesz frazę "quality thermal" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Improved calibration uncertainty assessment technique in coordinate metrology considering thermal influences
Autorzy:
Mussatayev, Meirbek
Huang, Meifa
Nurtas, Marat
Arynov, Azamat
Powiązania:
https://bibliotekanauki.pl/articles/2052177.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coordinate measuring machine
coordinate metrology
uncertainty
quality control
thermal influence
Opis:
Reliable measurement uncertainty is a crucial part of the conformance/nonconformance decision-making process in the field of Quality Control in Manufacturing. The conventional GUM-method cannot be applied to CMM measurements primarily because of lack of an analytical relationship between the input quantities and the measurement. This paper presents calibration uncertainty analysis in commercial CMM-based Coordinate Metrology. For the case study, the hole-plate calibrated by the PTB is used as a workpiece. The paper focuses on thermo-mechanical errors which immediately affect the dimensional accuracy of manufactured parts of high-precision manufacturers. Our findings have highlighted some practical issues related to the importance of maintaining thermal equilibrium before the measurement. The authors have concluded that the thermal influence as an uncertainty contributor of CMM measurement result dominates the overall budgets for this example. The improved calibration uncertainty assessment technique considering thermal influence is described in detail for the use of a wide range of CMM users.
Źródło:
Metrology and Measurement Systems; 2021, 28, 4; 609--626
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and Validation of Database in Computer Aided Design of Jewellery Casting
Autorzy:
Ignaszak, Z.
Wojciechowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/382474.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting of jewelry
Au-Ag-Cu alloy
computer design
thermal analysis
solidification
CAE system
NF&S
quality
odlewanie biżuterii
stop Au-Ag-Cu
projektowanie komputerowe
analiza termiczna
krzepnięcie
system CAE
jakość
Opis:
An overview of the bibliography regarding the connection of knowledge about precious metal alloys and aspects of the use of computer aided technologies to the optimization of the jewelry casting processes is presented. An analysis of the usability of selected CAx systems was made: 1) for spatial design, called Rhinoceros 6 and 2) CAE system: NovaFlow & Solid (NF&S). The authors describe own research including data acquisition and evaluation of temperature variations during solidification of the selected Au-Ag-Cu alloy, with the identification of the phase transformations of this alloy. The intensity of heat exchange was changed (cooling of specimens under ambient temperature conditions – "normal" intensity and with the furnace – very slow cooling). The problem of completing the simulation database was pointed out and analyzed. Examples of simulations of casting selected jewelry (ring and signet) were given and compared with the result of the experiment realized in real conditions. It was confirmed that the optimization by combining experimental and simulation studies allows for the acquisition of new knowledge, and also facilitates the creation of new artistic designs of jewelry as well as performing the feasibility check, and then optimizing the chosen technology.
Źródło:
Archives of Foundry Engineering; 2020, 20, 1; 9-16
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigations of effect of indoor air quality on thermal comfort in residential buildings
Autorzy:
Krzaczek, M.
Tejchman, J
Powiązania:
https://bibliotekanauki.pl/articles/231320.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
budynek mieszkalny
jakość powietrza wewnętrznego
stężenie CO2
komfort cieplny
CFD
strefa oddychania osobista
obciążenie cieplne
wentylacja naturalna
residential building
indoor air quality
CO2 concentration
thermal comfort
personal breathing zone
heat load
natural ventilation
Opis:
The influence of the CO2 concentration in a local air zone in naturally ventilated residential houses on the residents’ behaviour was numerically investigated. A numerical two-dimensional CFD model of the indoor zone based on experiments performed by the authors was used. Different resident locations in the fluid domain and different inlet velocities imposed by wind were considered in simulations. The overall thermal comfort and IAQ indices were also calculated. The investigations results show that in contrast to the overall air quality, the local CO2 was strongly dependent upon the resident location, fresh air inlet velocity and ventilation system type.
Źródło:
Archives of Civil Engineering; 2014, 60, 1; 91-121
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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