Temat: thermal characteristic

Skocz do pozycji: 1.

Tytuł:: Simulation and experimental study of the thermal characteristics of a high-speed motorized spindle
Autorzy:: Zhang, Wei
Jiang, Huaqiao
Tematy:: high-speed motorized spindle
thermal characteristic
finite element simulation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59111725.pdf Link otwiera się w nowym oknie
Opis:: Based on the finite element simulation software ANSYS Workbench, this study reports the thermal characteristics of a high-speed motorized spindle. The temperature field distribution and axial thermal deformation of the motorized spindle are then detected on an experimental platform. A comparison between the experimental and simulation results revealed the temperature rise of the motorized spindle during the working process. Under steady-state conditions of the working motorized spindle, the temperatures of the front bearing, rear bearing and stator were determined as 20°C, approximately 30°C and 25°C, respectively. The axial thermal elongation of the motorized spindle is approximately 10 μm
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Novel biocompatible transversal pneumatic artificial muscles made of PDMS/PET satin composite
Autorzy:: Szmechtyk, T.
Sienkiewicz, N.
Koter, K.
Kobierska, A.
Strzelec, K.
Tematy:: transversal pneumatic artificial muscles
chemical resistance
thermal characteristic
FT-IR
spectroscopy
static load characteristic; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/779765.pdf Link otwiera się w nowym oknie
Opis:: In this study novel transversal pneumatic artificial muscles (TPAM), made from composite – poly(dimethylsiloxane) (PDMS) matrix membrane and poly(ethylene terephthalate) (PET) satin reinforcement, are presented. Miniature TPAM consists of a flexible internal braid (IB) reinforcing the membrane and the external braid (EB). EB, with fibers arranged transversely to the IB, is placed laterally. Differently prepared TPAMs were tested for their effectiveness as actuators for robot drive and the PDMS/PET composite suitability was evaluated for applications in human gastrointestinal tract (chemical resistance, thermal characteristic). FT-IR spectra of the composite were compared for study PDMS impregnation process of PET satin and effect of immersion in selected solution. The composite shows outstanding biocompatibility and the muscles have competitive static load characteristics in comparison with other pneumatic artificial muscles (PAM). These results lead to believe, that in the near future painless examination of the gastrointestinal tract using a secure robot will be possible.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Thermomodernization – Rescue for the Building
Autorzy:: Orłowska, Magdalena
Tematy:: energy saving
characteristic
thermal modernization; Pokaż więcej
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:: https://bibliotekanauki.pl/articles/27315754.pdf Link otwiera się w nowym oknie
Opis:: The article discusses issues related to modifying existing buildings to improve their condition in terms of lower energy consumption and reducing heat loss. The study takes the form of a review. Current systems and data are described according to relevant standards. The issue of the energy efficiency of the building is explored. A list of the most common ways of thermal modernization has been presented. Financial support programs were discussed. The merits and drawbacks of the solutions are delineated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Implementation and demonstration of characteristic diagram as well as structure model based correction of thermo-elastic tool center point displacements
Autorzy:: Putz, M.
Ihlenfeldt, S.
Kauschinger, B.
Naumann, C.
Thiem, X.
Riedel, M.
Tematy:: hexapod
characteristic diagram
thermal error
simulated
measured
correction algorithm; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/99680.pdf Link otwiera się w nowym oknie
Opis:: In milling machines, waste heat from motors, friction effects on guides and most importantly the milling process itself greatly affect positioning accuracy and thus production quality. Therefore, active cooling and lead time are used to reach thermal stability. A cheaper and more energy-efficient approach is to gather sensor data from the machine tool to predict and correct the resulting tool center point displacement. Two such approaches are the characteristic diagram based and the structure model based correction algorithms which are briefly introduced in this paper. Both principles have never been directly compared on the same demonstration machine, under the equal environmental conditions and with the same measurement setup. The paper accomplishes this comparison ona hexapod kinematics examined in a thermal chamber,where the effectiveness of both approaches is measured and the strengths and weaknesses of both are pointed out.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Concept of Integrating a Hybrid Thermal Error Compensation Into an Existing Machine Tool Control Architecture
Autorzy:: Geist, Alexander
Yaqoob, Muhammad Faisal
Friedrich, Christian
Naumann, Christian
Ihlenfeldt, Steffen
Tematy:: thermal error compensation
machine tool
control integration
characteristic diagram; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/59124045.pdf Link otwiera się w nowym oknie
Opis:: Thermal error compensation via a numeric control (NC) system is a proven option for upgrading the precision of machine tools. The main advantage is the generally cost-effective application, as no changes to the machine design are necessary. Since modern machine tools are equipped with standard numeric controls along with additional functions and integrated temperature sensors in the machine, compensation methods such as a characteristic diagram (CD) based compensation can be implemented. To increase the applicability and reliability of this CD regression method, a hybrid model approach with a virtual thermo-elastic finite element (FE) machine model and a real-time computable structural model of a machine tool was developed. The structural model uses model order reduction to calculate the current load case in real-time using continuously recorded machine data (motor current, axis position, temperatures). It acts as a virtual monitoring application to check, whether the current machine condition still matches the current CD based prediction. If the current load case is not suitable to the active CDs or any other stored CDs, the generation of new CDs is automatically triggered. In this article, the integration of the hybrid compensation method using an FE model and a structural model of a machine tool is methodically demonstrated. The main focus is on the integration of different software and hardware architectures and their interaction.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Optimized grid structures for the characteristic diagram based estimation of thermo-elastic tool center point displacements in machine tools
Autorzy:: Putz, M.
Ihlenfeldt, S.
Naumann, C.
Glänzel, J.
Tematy:: characteristic diagram
adaptive structured grids
thermoelastic deformation
grid optimization
thermal error estimation; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/100061.pdf Link otwiera się w nowym oknie
Opis:: It is a well-known problem of milling machines, that waste heat from motors, friction effects on guides and also the milling process itself greatly affect the positioning accuracy and thus the production quality. An economic and energy-efficient method of correcting this thermo-elastic positioning error is to gather sensor data from the machine tool and the process and to use that information to predict and correct the resulting tool center point displacement using high dimensional characteristic diagrams. The size of these characteristic diagrams depends on the number of input variables (sensors) and the fineness of the discretization of the grid. While the number of sensors can usually not be reduced without affecting the quality of the prediction, it is often possible to minimize the size of characteristic diagrams through the use of adaptive grid refinement. This ensures that the finest grid sections correspond with the load cases that have the largest local gradients. Through such adaptive refinement, it is possible to reduce storage capacity and computation time without significant loss of precision. The aim of this article is to examine, test and compare different methods of adaptive grid refinement. For this, simulation data from a machine tool is used.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Influence of the Detector Characteristic on the Result of Sky Temperature Measurement with the Use of Long-Wave Infrared Camera
Autorzy:: Kruczek, T.
Tematy:: thermovision infrared measurements
sky thermal radiation
sky temperature
characteristic of infrared camera detector; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/114666.pdf Link otwiera się w nowym oknie
Opis:: During the temperature measurements by means of infrared camera the temperature of surrounding elements must be known. In the case of thermovision inspections of the objects exposed to open air space, the surroundings consists of two elements, it is the ground and hypothetical sky surface. The sky temperature measured by long-wave IR camera is of apparent character because it expresses the thermal radiation of the sky within the spectral operational range of this camera i.e. 7.5÷13 μm. The abovementioned spectral range is coincident with so called atmospheric window within which the thermal radiation of the sky is relatively low. The emissivity of atmosphere within this window is low in the central part and high near the limits of the aforementioned range. In relation with the detector characteristic of the IR camera it causes underestimation of the measured sky temperature. This work deals with the analysis of influence of the IR camera detector characteristic on the results of determination of sky temperature and its thermal radiation intensity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Effects of different grain size of expanded perlite aggregate and content of silica aerogel on the characteristics of lightweight cementitious composite
Autorzy:: Vashchuk, Andrii
Ślosarczyk, Agnieszka
Tematy:: lightweight composite
expanded perlite aggregate
silica aerogel
mechanical characteristic
thermal conductivity coefficient
scanning electron microscopy; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/24085741.pdf Link otwiera się w nowym oknie
Opis:: In this research, an attempt was made to investigate effects of expanded perlite aggregate grain size on consistency, density, compressive strength, thermal conductivity and microstructure of 15 different composite mixes with silica aerogel. As for the samples preparation, expanded perlite aggregate of 5 different groups based on grain size, were used for sample preparation, then partially replaced by volume for 20% and 40% of hydrophobic silica aerogel particles. The results showed, that density of the samples varied between 0.35 g/cm3 and 1.5 g/cm3, flexural strength varied between 3.4 MPa and 7.4 MPa, compressive strength was in the range between 12.3 MPa and 55 MPa, thermal conductivity coefficient was in the range between 0.130 W/mK and 0.190 W/mK. Scanning electron microscopy showed that expanded perlite aggregates and silica aerogel particles are capable of being mixed and formed homogenous mixture. Nevertheless, microscope images indicated weaker adhesion of silica aerogel particles at interfacial zone as compared with expanded perlite aggregate particles. Results revealed, that both of the factors: grain size of expanded perlite aggregate particles silica aerogel content influenced the density, compressive strength and thermal conductivity. The study also indicated feasibility of expanded perlite aggregate and silica aerogel for achieving homogeneous mixture of the lightweight cementitious composites. Study demonstrated that using different size fractions of expanded perlite aggregate affects differently physical, mechanical and thermal characteristics of the lightweight cementitious composite with silica aerogel.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Thermolift oil recovery technologies stimulated with a resource-saving energy system
Technologie wydobycia ropy naftowej Thermolift, w których stosowany jest system energetyczny pozwalający na oszczędne wykorzystanie zasobów
Autorzy:: Hasanov, Ramiz
Ramazanov, Fazil
Musavi, Saida
Kazimov, Musa
Tematy:: well
thermal lift
thermal activity
electrochemical generator
metric characteristic
threshold value
compatibility
electrophysical phenomena
material support
odwiert
wypór termiczny
aktywność termiczna
generator elektrochemiczny
cechy wskaźników
wartość progowa
kompatybilność
zjawiska elektrofizyczne
wsparcie materiałowe; Pokaż więcej
Wydawca:: Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/31344031.pdf Link otwiera się w nowym oknie
Opis:: In this article, the creation of a thermal lift technology for oil wells through the use of installations with a solid oxide fuel cell has been discussed. The necessary calculations were carried out to determine the level of thermal activity in wells producing hydrocarbon resources of various compositions. Arrangements necessary to achieve this thermal activity based on solid oxide fuel cells (SOFCs) are proposed. SOFC metric characteristics are proposed that are compatible with their additional phenomena, namely, material support, shape, etc. The threshold value of the operating thermal characteristic of SOFCs is obtained depending on the structural and physical properties of their material support. The most effective ways for determination of the required thermobaric parameters of the fluid in accordance with the formation area and product, development of a resource-saving complex for the production of percussion fluid in accordance with these parameters, determination of processing periodicity to manage the thermobaric condition of the formation area, assessment of impact on the formation area and other factors generalise them. The purpose of the article is to develop a technology for management the thermobaric condition of the area through alternative resource-saving energy systems (development of Thermolift technology), substantiation of operational parameters and creation of surface equipment. The scientific idea of the presented article significantly increases the mobility of their hydrocarbon reserves on the basis of the thermobaric action of working agents, which are the product of a resource-saving surface complex (i.e. by providing Thermolift technology) and, finally increases the operational efficiency of production wells and, as a result, the production capacity of the reservoirs.
W niniejszym artykule omówiono powstanie technologii wyporu termicznego dla odwiertów ropnych przez zastosowanie instalacji z ogniwem paliwowym ze stałym tlenkiem. Przeprowadzono wymagane obliczenia w celu ustalenia poziomu aktywności termicznej w odwiertach eksploatujących zasoby węglowodorów o różnym składzie ropy naftowej. Zaproponowano układy niezbędne do osiągnięcia tej aktywności termicznej oparte na ogniwach paliwowych ze stałym tlenkiem (SOFC). Zaproponowano takie parametry wskaźników SOFC, które są zgodne z ich dodatkowymi cechami, takimi jak rodzaj zastosowanego materiału, kształt itd. Wartość progowa eksploatacyjnej charakterystyki termicznej SOFC uzależniona jest od właściwości strukturalnych i fizycznych zastosowanego do ich konstrukcji materiału. Związane jest to z najbardziej efektywnymi sposobami określenia wymaganych parametrów temperaturowo-ciśnieniowych eksploatowanego płynu w zależności od obszaru występowania formacji i produktu, opracowaniem bezpiecznego dla zasobów systemu produkcji płynu udarowego zgodnego z tymi parametrami, określeniem częstotliwości przetwarzania w celu zarządzania warunkami temperaturowo- ciśnieniowymi w obrębie formacji, czy też oceną oddziaływania w obszarze występowania formacji. Celem artykułu jest przedstawienie opracowanej technologii do zarządzania warunkami temperaturowo-ciśnieniowymi obszaru złoża wykorzystującej alternatywne, pozwalające na oszczędne wykorzystanie zasobów, systemy energetyczne (technologia Thermolift), wraz z uzasadnieniem parametrów eksploatacyjnych i przedstawieniem osprzętu powierzchniowego. Naukową ideą niniejszego artykułu jest znaczące zwiększenie zakresu mobilności dostępnych zasobów węglowodorów dzięki temperaturowo-ciśnieniowemu działaniu czynników roboczych będących produktem systemu powierzchniowego pozwalającego na bardziej ekonomiczne wykorzystanie zasobów (tj. poprzez dostarczenie technologii Thermolift), a finalnie – zwiększenie wydajności operacyjnej odwiertów eksploatacyjnych, prowadzące w efekcie do wzrostu wydajności produkcyjnej złóż ropy naftowej.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Thermal compressor of cascade exchange by pressure
Termiczny kompresor do kaskadowej wymiany ciśnienia
Autorzy:: Krajniuk, A.
Tematy:: kaskadowa wymiana ciśnienia
kompresor termiczny
cykl pracy
temperatura
energooszczędność
wydajność
charakterystyka obciążenia
cascade pressure exchange
thermal compressor
working cycle
temperature
power efficiency
performance
load characteristic; Pokaż więcej
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Powiązania:: https://bibliotekanauki.pl/articles/374103.pdf Link otwiera się w nowym oknie
Opis:: A new method of organization of working cycle of device of direct transformation of heat in the located work of compression of air, based on principle of cascade exchange by pressure, is exposed; the results of pre-selection of basic dimensional and structural parameters of thermal compressor of cascade exchange by pressure are adduced; some special features of its working process are considered; main directions of perfection of working cycle of thermal compressors of cascade exchange of pressure are shown.
Dostawca treści:: Biblioteka Nauki

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