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Wyszukujesz frazę "sliding" wg kryterium: Temat


Tytuł:
Sliding mode control of periodic review perishable inventories with multiple suppliers and transportation losses
Autorzy:
Bartoszewicz, A.
Maciejewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200764.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
discrete time sliding mode control
sliding surface design
inventory control
Opis:
The purpose of this paper is to develop robust and computationally efficient supply chain management strategy ensuring fast reaction to the demand variations for periodic review perishable inventory systems. For that purpose, we apply a sliding mode approach and we propose a new discrete time warehouse management strategy. The strategy employs the sliding hyperplane appropriately designed to ensure a dead-beat performance of the closed loop system. Our strategy not only explicitly takes into account decay of goods stored in the warehouse (perishing inventories) but it also accounts for transportation losses which take place on the way from suppliers to the warehouse. The proposed strategy ensures full customers’ demand satisfaction, minimizes the on-hand inventory volume and prevents from exceeding the warehouse capacity. This reflects the need of simultaneous minimization of the lost sales costs and inventory holding costs. Furthermore, the strategy ensures that the ordered quantities of goods are always non-negative and upper bounded. These favourable properties of the proposed strategy are formally stated as a lemma and three theorems and proved in the paper.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 885-892
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surgical trap of a routine procedure. Scrotal hernia with concomitant sliding of the urinary bladder – case report
Autorzy:
Cybułka, Bartosz
Podgórny, Marek
Rapeła, Jacek
Wach, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1394320.pdf
Data publikacji:
2015
Wydawca:
Index Copernicus International
Tematy:
scrotal hernia
sliding hernia
sliding of the urinary bladder
scrotal cystocele
Opis:
The content of the hernial sac may comprise peritoneal cavity elements, such as small and large bowel loops, visceral adipose tissue, the greater omentum, appendix (amyand hernia), and Meckel's diverticulum. The sliding of part of the urinary bladder wall to the inguinal canal is rare, being observed in 1%-4% (0.5%-3%) of inguinal hernia cases. Complete migration of the urinary bladder to the scrotum is considered a rare anomaly. As of today, 100 such cases have been described.
Źródło:
Polish Journal of Surgery; 2015, 87, 11; 587-591
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ siły docisku zestyku na parametry zestyków ślizgowych stosowanych w elektrycznej trakcji kopalni miedzi
Influence of contact force on the performance of dc sliding contacts in copper mine electric rail transport
Autorzy:
Miedziński, B.
Okraszewski, Z.
Habrych, M.
Wandzio, J.
Powiązania:
https://bibliotekanauki.pl/articles/187016.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG
Tematy:
parametry zestyków slizgowych
zestyk ślizgowy
performance of sliding contacts
sliding contact
Opis:
W artykule przedstawiono wyniki badań wpływu wartości siły docisku zestyku w stykach ślizgowych prądu stałego stosowanych w układach zasilania elektrycznej trakcji kopalnianej w kopalni miedzi na ich podstawowe parametry eksploatacyjne. Badania miały na celu znalezienie rozwiązania umożliwiającego zastąpienie dotychczas stosowanych ślizgów grafitowych, charakteryzujących się dużym zużyciem i uszkodzeniami mechanicznymi materiału, dużymi lokalnymi stratami energii i związanymi z nimi lokalnymi przegrzewaniami. Zaproponowano zastosowanie nowych ślizgów wykonanych z materiału kompozytowego miedź-molibden. Na podstawie przeprowadzonych badań sformułowano wnioski praktyczne odnośnie do efektywności wymiany ślizgów grafitowych na ślizgi wykonane z materiału kompozytowego typu Cu-Mo.
The paper features the test results of the influence of contact force on the basic performance parameters of DC sliding contacts used in the electric drives in copper mine electric rail transport. The tests aimed at finding a solution to replace the sliding contacts made of graphite which demonstrated excessive wear, mechanical damages of the material, significant local energy losses, and related local overheating. The new sliding contacts were proposed, made of a copper-molybdenum composite material. Based on the performed tests results, practical conclusions were drawn with respect to the efficiency of replacing the graphite sliding contacts with the contacts made of the copper-molybdenum composite material.
Źródło:
Mechanizacja i Automatyzacja Górnictwa; 2009, R. 47, nr 4, 4; 15-26
0208-7448
Pojawia się w:
Mechanizacja i Automatyzacja Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of a sliding gate controlled by a PLC driver
Autorzy:
Majcher, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/376511.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
PLC
sliding gate
visualisation
Opis:
Due to low costs, PLC controllers are used not only in technological processes but also in everyday life. The article presents the possibility of using a PLC controller to control the operation of a sliding gate. For this purpose, a design was created and a sliding gate model made controlled with a Siemens S7-1200 PLC controller. This model is used to develop various gate control algorithms, especially for appropriate gate protection against crushing or uncontrolled closing. In addition, this model is connected via the Internet to a stand equipped with the SCADA application. The iFix 5.8 PL application was used to visualise the operation of the door, which, by means of a communication driver, allows the elevator operation to be controlled remotely. In addition, elements are shown in a graphic way, whereby it is possible to assess the position of the gate.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 99; 191-199
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of sliding surface on the performances of adaptive sliding mode slip ratio controller for a HEV
Autorzy:
Dash, B. K.
Subudhi, B.
Powiązania:
https://bibliotekanauki.pl/articles/229381.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sliding mode control
slip ratio control
hybrid electric vehicle
sliding surface
ABS
Opis:
Slip ratio control of a ground vehicle is an important concern for the development of antilock braking system (ABS) to avoid skidding when there is a transition of road surfaces. In the past, the slip ratio models of such vehicles were derived to implement ABS. It is found that the dynamics of the hybrid electric vehicle (HEV) is nonlinear, time varying and uncertain as the tire-road dynamics is a nonlinear function of road adhesion coefficient and wheel slip. Sliding mode control (SMC) is a robust control paradigm which has been extensively used successfully in the development of ABS of a HEV. But the SMC performance is influenced by the choice of sliding surface. This is due to the discontinuous switching of control force arising in the vicinity of the sliding surface that produces chattering. This paper presents a detailed study on the effects of different sliding surfaces on the performances of sliding mode based adaptive slip ratio control applied to a HEV.
Źródło:
Archives of Control Sciences; 2013, 23, 2; 187-203
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive fuzzy-sliding mode controller for trajectory tracking control of quad-rotor
Autorzy:
Simoud, Lahcen
Kadri, Boufeldja
Bousserhane, Ismail Khalil
Powiązania:
https://bibliotekanauki.pl/articles/384825.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
quadrotor UAV
sliding mode control
adaptive PD-Slidng mode controller
fuzzy PD-sliding mode
Opis:
This paper deals with the design of an adaptive-fuzzy-PD-Sliding mode controller to achieve stabilization of a quadrotor aircraft in the presence of wind disturbance. Firstly, the dynamic system modeling is carried out using Euler-Lagrange formalism. Then, an adaptive PD-sliding mode control system with an integral-operation switching surface is investigated for quadrotor desired trajectory tracking. Finally, an adaptive fuzzy-PD-sliding mode controller is proposed to achieve control objectives and system stabilization where the fuzzy logic system used to dynamically control parameters settings of the PD-sliding mode equivalent control law. Effectiveness and robustness of the proposed control scheme is verified through simulation results taking into account external disturbances. The simulation results of a quadrotor aircraft control with the proposed controller demonstrate the high performance during flight such as null tracking error and robustness in the presence of external disturbances.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 2; 15-24
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filtered integral sliding mode control in a two-mass drive system
Autorzy:
Dróżdż, P.
Szabat, K.
Powiązania:
https://bibliotekanauki.pl/articles/1193310.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
filtered integral sliding mode control
integral sliding mode control
two-mass system
chattering alleviation
Opis:
The paper presents issues related to the application of filtered integral sliding mode control to a two-mass drive system. A classical control structure has been presented and its design procedure is shown in detail. The properties of the classical structure, in which the chattering phenomenon seems to be a big drawback, have been summarized. In order to eliminate this phenomenon, an output low-pass filter has been proposed and the performance of this system has been tested. In order to improve its characteristics, an adaptive low-pass filter has been proposed. The bandwidth of the filter was changed on-line by the fuzzy system according to the current state of the plant. During the steady-states, the bandwidth is low to eliminate chattering effect, and during transients higher in order to ensure the fast dynamics of the plant.
Źródło:
Power Electronics and Drives; 2017, 2, 37/1; 121-134
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gravity- and Turbulence-Dominated Sediment Motion in the Clear-Water Scour Process at a Vertical-Wall Abutment in Pressurized Flow
Autorzy:
Radice, A.
Ballio, F.
Tran, C. K.
Powiązania:
https://bibliotekanauki.pl/articles/241458.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
abutment scour
sediment kinematics
turbulence
sliding
Opis:
Results on the motion of sediment particles on the bottom of the erosion hole are shown for a clear-water scour experiment with a vertical-wall abutment. The paper presents an investigation of particle kinematics starting from the division of the grain instantaneous movements into two populations, namely the "turbulence-dominated" events (those in which the particle motion is triggered by the turbulent flow field) and the "gravity-dominated" events (those in which the particles slide along the slopes of the scour hole due to geotechnical instability). Attention is focused on the well developed stages of the erosion process. For such experimental times, the action of the principal vortex system is particularly evident because the latter is not much stretched along the direction of the mean flow deviation, thanks to the increased flowing area. At the same time, the temporal unsteadiness of the vortices lets a bimodal behaviour of the sediments to emerge. A relevant difference has been found between the dynamics of gravity-dominated and turbulence-dominated events. In addition, it was found that the presence of geotechnical effects in the erosion hole may significantly alter the scour rate. Potential implications of the present results for the modelling of local scour processes are described.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2010, 57, 1; 43-59
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological properties of surface layer with boron
Autorzy:
Lubas, J.
Powiązania:
https://bibliotekanauki.pl/articles/242091.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
wear
sliding friction
surface treatment
boron
Opis:
The aim of the present work is to determine the influence of technologically produced boron surface layers on the friction parameters in the sliding pairs under the conditions of mixed friction. The tribological evaluation included ion nitrided, pack borided, laser borided, quenched and tempered surface layers and TiB2 coating deposited on 38CrAlMo5-10, 46Cr2 and 30MnB4 steels. Modified surface layers of annular samples were matched under test conditions with counter-sample made from AlSn20 bearing alloy. Tested sliding pairs were lubricated 15 W/40 Lotos mineral engine oil. The tribological tests were conducted on a T-05 block on ring tester. The applied steel surface layer modification with boron allow creating surface layers with pre-determined tribological characteristics reąuired for the elements of kinematic pairs operating in the conditions of sliding friction. Pack boronizing reduces the friction coefficient during the start-up of the frictional pair and the maximum start-up resistance level is similar to the levels of pairs with nitrided surface layers. Paper present comparison between surface roughness of annular sample and countersample before and after test, influence of surface treatment annular sample on change of friction coefficient vs. rotation speed and load, influence of surface treatment annular sample on moment of friction in function load of kinematics pair, influence of surface treatment annular sample on friction forces and temperature depending on load, as well as influence of surface treatment annular sample on wear of AlSn20 bearing alloy under various load conditions.
Źródło:
Journal of KONES; 2009, 16, 3; 213-221
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strategie sterowania ślizgowego z ruchomą hiperpowierzchnią przełączeń - krótki przegląd
Sliding Mode Control Strategies with a Time-Varying Switching Hypersurface - a Brief Survey
Autorzy:
Latosiński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/275701.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
teoria sterowania
sterowanie ślizgowe
ruchome hiperpowierzchnie przełączeń
control theory
sliding mode control
time-varying sliding hypersurface
Opis:
Strategie sterowania ślizgowego są cenione za swoją całkowitą niewrażliwość na klasę zakłóceń i niepewności modelu. Uzyskanie tej właściwości jest możliwe przez sprowadzenie punktu opisującego dynamikę układu na pewną hiperpowierzchnię przełączeń zdefiniowaną w przestrzeni stanów. W początkowym etapie sterowania, w którym punkt opisujący zbliża się do tej hiperpowierzchni, układ pozostaje wrażliwy na zakłócenia, co utrudnia projektowanie skutecznych strategii sterowania ślizgowego. Aby zapewnić odporność układu na zakłócenia i niepewności modelu na wszystkich etapach procesu sterowania liczni autorzy zaproponowali zastosowanie ruchomych hiperpowierzchni przełączeń. Celem niniejszego artykułu przeglądowego jest przedstawienie najważniejszych osiągnięć z zakresu sterowania ślizgowego z wykorzystaniem takich hiperpowierzchni. Omówione są pionierskie prace proponujące zastosowanie ruchomych hiperpowierzchni przełączeń oraz przedstawione są metody ich projektowania. Następnie podkreślone są najważniejsze osiągnięcia z zakresu sterowania ślizgowego wykorzystującego ruchome hiperpowierzchnie przełączań zarówno dla układów ciągłych jak i dyskretnych.
Sliding mode control strategies are valued for their total insensitivity to the class of disturbances and uncertainty of the model. Obtaining this property is possible by bringing a point describing the dynamics of the system to a certain switching hypersurface defined in the state space. At the initial stage of control, where the description point approaches this hypersurface, the system remains sensitive to interferences, which hinders the design of effective sliding mode control strategies. To ensure the system’s resistance to interference and model uncertainty at all stages of the control process, many authors proposed the use of mobile switching hypersurfaces. The purpose of this review article is to present the most important achievements in the area of sliding mode control using such hypersurfaces. Discussed are pioneering works proposing the use of mobile switching hypersurfaces and methods of their design are presented. Next, the most important achievements in the area of sliding mode control using movable switching hypersurfaces for both continuous and discrete systems are highlighted.
Źródło:
Pomiary Automatyka Robotyka; 2020, 24, 1; 41-47
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratoryjna ocena wpływu nacisku i prędkości ślizgania na intensywność zużycia stali obręczowej gatunku B6T przy suchym tarciu ślizgowym
Laboratory assessment of the influence of contact pressure and sliding speed on wear rate of a tyre steel grade B6T in dry sliding conditions
Autorzy:
Witaszek, M.
Witaszek, K.
Powiązania:
https://bibliotekanauki.pl/articles/198289.pdf
Data publikacji:
2008
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
prędkość ślizgania
stal obręczowa
B6T
suche tarcie ślizgowe
sliding speed
tyre steel
dry sliding conditions
Opis:
Koła kolejowe są odpowiedzialnymi elementami o dużym wpływie na bezpieczeństwo i niezawodność przewozów. Ich zużywanie, będące skutkiem tarcia pomiędzy kołami a szynami, jest ważną przyczyną utraty właściwości użytkowych. Zużywanie to zależy między innymi od takich czynników, jak nacisk i prędkość ślizgania. W pracy przedstawiono wyniki badań wpływu tych czynników na zużycie stali gatunku B6T stosowanej na obręcze kół lokomotyw.
Rail wheels are responsible elements with significant influence on the transport safety and reliability. Their wear, caused by a wheel - rail friction, is an important cause of wheels deterioration. This wear is strongly influenced by such factors as contact pressure and sliding velocity In the present work the influence of tat factors on dry, sliding wear of a tyre steel grade B6T is studied. This steel is used for locomotive tyres manufacturing.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2008, 64; 267-274
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust impedance control of a piezoelectric stage under thermal and external load disturbances
Autorzy:
Zareinejad, M.
Rezaei, S. M.
Ghidary, S. S.
Abdullah, A.
Motamedi, M.
Powiązania:
https://bibliotekanauki.pl/articles/969687.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
piezoelectric actuator
sliding mode
impedance control
hysteresis
Opis:
Piezoelectric actuators are widely used in micromanipulation tasks such as atomic force microscopy and cell manipulation. However, the hysteresis nonlinearity and the creep reduce their fidelity and cause difficulties in the micromanipulation control procedure. Besides, variation of temperature and external loads could change the model parameters identified for the piezo actuator. In this paper, a novel feedforward-feedback controller is proposed. The modified Prandtl-Ishlinskii model is utilized to linearize the actuator hysteresis in feedforward scheme and a sliding mode based impedance control with perturbation estimation is used to cancel out the thermal and external load disturbances in feedback scheme. The efficiency of the proposed controller is verified by experiments.
Źródło:
Control and Cybernetics; 2009, 38, 3; 635-648
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of CrN and TiN coatings in slide bearing kinematic coupling pin surface layer modification processes
Autorzy:
Lubas, J.
Powiązania:
https://bibliotekanauki.pl/articles/244165.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
TiN
CrN
wear
sliding friction
surface treatment
Opis:
This work presents the results of tribological stand tests of slide bearings with pins modified with CrN and TiN coatings and pins with a TiN-steel 46Cr2 and CrN-steel 46Cr2 ,,ring" structure. The ,,rin" structure samples features materials with different tribological properties in the form of rings on the pin slide surface. Such a structure is obtained when covering the 46Cr2 steel pin base with a discrete layer of TiN or CrN, using the PVD method. The stand tests of frictional couplings have been performed for the frictional kinematic coupling pin with modified surface layer and CuPb30 and AlSn20 alloy bearing liner slice. During the tests the tribological couplings were lubricated with Castrol magnatec engine oil (5W/40). The tests were performed on a T-05 tribological tester. The test results demonstrated the tribological advantageous using the "ring" structure samples in the frictional couplings. The tests demonstrated that the friction forces and the bearing material quantity wear were the least for couplings with CrN steel, 46Cr2 and nitrogen hardening, and the largest for TiN pin couplings. Modification of the CrN pin surface layer has a beneficial impact on reducing frictional resistance, and temperature reduction in the friction area as well as reduction in bearing alloy wear.
Źródło:
Journal of KONES; 2008, 15, 2; 263-267
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of an Induction Motor Using Sliding Mode Linearization
Autorzy:
Etien, E.
Cauet, E.
Rambault, L.
Champenois, G.
Powiązania:
https://bibliotekanauki.pl/articles/908504.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
automatyka
induction motor
sliding mode control
linearization
Opis:
Nonlinear control of the squirrel induction motor is designed using sliding mode theory. The developed approach leads to the design of a sliding mode controller in order to linearize the behaviour of an induction motor. The second problem described in the paper is decoupling between two physical outputs: the rotor speed and the rotor flux modulus. The sliding mode tools allow us to separate the control from these two outputs. To take account of parametric variations, a model-based approach is used to improve the robustness of the control law despite these perturbations. Experimental results obtained with a laboratory setup illustrate the good performance of this technique.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 4; 523-531
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does water lubrication affect friction differently for rocks and soils? Evidence and open questions
Autorzy:
Cafaro, F.
Hamad, A.
Monterisi, L.
Powiązania:
https://bibliotekanauki.pl/articles/2172879.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
water lubrication
friction scale
fracture
sliding
roughness
Opis:
The present paper focuses on the shear strength exhibited by rocks and soils when sliding along dry and wet surfaces, with this mechanism of failure being strongly related to the water lubrication phenomenon. It is well known that the frictional behaviour of geomaterials requires multiscale investigation. Under this perspective, experimental evidence of both friction at the grain scale (i.e. interparticle friction) and friction along sliding surfaces of rock and granular soil samples (i.e. surface friction) are analysed by using data from the literature. The review is addressed at linking different scales, stating the differences between rocks and soils in terms of frictional response to sliding and trying to point out still open problems for the research.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 3; 211--223
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł

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