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Wyświetlanie 1-10 z 10
Tytuł:
Breaking the Testing Pyramid with Virtual Testing and Hybrid Simulation
Autorzy:
You, Shawn
Gao, Shawn
Nelson, Arlin
Powiązania:
https://bibliotekanauki.pl/articles/98010.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
virtual testing
hybrid simulation
reduced order model
cross coupling
ANSYS
Opensees
OpenFresco
Opis:
Virtual testing and hybrid simulation have become an important trend in airplane design and validation. The traditional Testing Pyramid (or Building Block) approaches that emphasis on uniaxial coupon test and full structure certification test are being challenged. Researchers are trying to use advanced testing and simulation methods to replace the Testing Pyramid approach. Before physical testing, virtual testing can be conducted to simulate the physical test. Virtual model of the full testing system including controller, actuators, and fixtures can be constructed and validated. In this work, an example has been developed and validated to show the potentials of the virtual testing process. Hybrid simulation is an approach of analyzing an analysis model and physical structure integrated system under realistic loading conditions. Hybrid simulation combines the lab testing with numerical analysis to explore the benefits of both methodologies. In this study, a hybrid simulation for a simplified airplane wing was conducted to demonstrate the process. Virtual testing and hybrid simulation are alternative methods of Testing Pyramid approach. Full scale tests are still required for certification but the more that is known about the test article, the greater chances of success in the full-scale certification testing.
Źródło:
Fatigue of Aircraft Structures; 2019, 11; 1-10
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Suzuki-Miyaura cross-coupling reaction catalyzed by new synthesized palladium complex containing N,N,O-Tridentate ligands
Autorzy:
Jadeja, Juvansinh J.
Gondaliya, Mitesh B.
Mokariya, Devang M.
Shah, Manish
Powiązania:
https://bibliotekanauki.pl/articles/1182763.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
N
O-Tridentate ligand
Palladium complex
Schiff base
Suzuki-Miyaura cross-coupling reaction
Opis:
N,N,O-Tridentate ligands were prepared by the condensation of 1-(Benzothiazole 2-yl) hydrazine with substituted salicyldehydes or different aromatic ketones. New synthesized metal complex are thermally stable and neither air- nor moisture-sensitive. Suzuki–Miyaura cross-coupling reaction is carried out in present of various ligands and palladium salts, Different solvent/water ratio with different Base and studied effects its effect on the performance of the coupling reaction.
Źródło:
World Scientific News; 2017, 66; 238-249
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Design Methodology For Enhancing The Transient Loading Of Low Drop-out Regulators (LDRs)
Autorzy:
Abdel-Monem, Ahmed
El-Mashade, Mohamed B.
Dabbous, T. E.
Powiązania:
https://bibliotekanauki.pl/articles/227180.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
low drop-out regulator
cross coupling
jumps of the load current
undershot
overshot
Opis:
A new simple design methodology which makes LDR output nearly insensitive to jumps of the load current for long times is proposed. This methodology is tested for more than 10⁴ seconds. Our procedure leans on cross coupling of the time second derivative of the LDR power transistor gate and drain voltages along with their currents. This technique keeps low values of these currents in order of nano or hundreds of micro amperes for undershot or overshot cases, respectively. The introduced methodology has been applied to a standard CMOS of 0.18μm technology for NMOS transistors and validated using MATLAB R2014a.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 319-327
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unified model of disturbances acting upon gimbal seeker in anti-tank guided missile
Autorzy:
Nawrocki, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/2141856.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
anti-tank guided missile
gimbal seeker
disturbances
dynamic LuGre friction
imbalance
cross coupling
Opis:
Optimisation of the dynamic response of gimbal seeker plays key role from the point of view of development of anti-tank guided missile’s systems. In this study the set of the most important internal disturbances were integrated in generalized model of two axis gimbal seeker implemented in MathWorks’ Simulink environment. Compared to previous works on the subject, it was enhanced by replacing simple friction model with dynamic LuGre friction. Furthermore, its Coulomb component was linked to the normal force induced by missile’s lateral acceleration. Control system of gimbal seeker proposed in paper was tuned with modelled disturbances turned off and then examined with them being turned one by one. System’s responses were assessed to be significantly deteriorated, proving need of disturbance modelling and its use in control systems’ design.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2021, 15, 3; 54-69
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A double-iterative learning and cross-coupling control design for high-precision motion control
Autorzy:
Xu, Wan
Hou, Jie
Yang, Wei
Wang, Cong
Powiązania:
https://bibliotekanauki.pl/articles/140531.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
iterative learning control
cross-coupled control
contour tracking performance
double-iterative learning and cross coupling
Opis:
In multi-axis motion control systems, the tracking errors of single axis load and the contour errors caused by the mismatch of dynamic characteristics between the moving axes will affect the accuracy of the motion control system. To solve this issue, a biaxial motion control strategy based on double-iterative learning and cross-coupling control is proposed. The proposed control method improves the accuracy of the motion control system by improving individual axis tracking performance and contour tracking performance. On this basis, a rapid control prototype (RCP) is designed, and the experiment is verified by the hardware and software platforms, LabVIEW and Compact RIO. The whole design shows enhancement in the precision of the motion control of the multi- axis system. The performance in individual axis tracking and contour tracking is greatly improved.
Źródło:
Archives of Electrical Engineering; 2019, 68, 2; 427-442
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraordinary optical transmission and vortex excitation by periodic arrays of Fresnel zone plates
Autorzy:
Roszkiewicz, A.
Nasalski, W.
Powiązania:
https://bibliotekanauki.pl/articles/202304.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Fresnel zone plates
focusing
cross-polarisation coupling
optical vortices
Opis:
Extraordinary optical transmission and good focusing properties of a two-dimensional scattering structure is presented. The structure is made of Fresnel zone plates periodically arranged along two orthogonal directions. Each plate consists of two ring-shaped waveguides supporting modes that match the symmetry of a circularly polarized incident plane wave. High field concentration at the focal plane is obtained with the short transverse and long longitudinal foci diameters. Optical vortex excitation in a paraxial region of the transmitted field is also observed and analysed in terms of cross-polarisation coupling. The structure presented may appear useful in visualization, trapping and precise manipulations of nanoparticles.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 855-861
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of fractional calculus in iterative sliding mode synchronization control
Autorzy:
Zhang, Xin
Wen-Ru, Lu
Zhang, Liang
Xu, Wen-Bo
Powiązania:
https://bibliotekanauki.pl/articles/141629.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cross-coupling control
fractional calculus
iterative learning control
PD control
robot arm
sliding mode control
Opis:
In order to control joints of manipulators with high precision, a position tracking control strategy combining fractional calculus with iterative learning control and sliding mode control is proposed for the control of a single joint of manipulators. Considering the coupling between joints of manipulators, a fractional-order iterative sliding mode crosscoupling control strategy is proposed and the theoretical proof of its progressive stability is given. The paper takes a two-joint manipulator as the research object to verify the control strategy of a single-joint manipulator. The results show that the control strategy proposed in this paper makes the two-joint mechanical arm chatter less and the tracking more accurate. The synchronous control of the manipulator is verified by a three-joint manipulator. The results show that the angular displacement adjustment times of the threejoint manipulator are 0.11 s, 0.31 s and 0.24 s, respectively. 3.25 s > 5 s, 3.15 s of a PD cross-coupling control strategy; 2.85 s, 2.32 s, 4.22 s of a PD iterative cross-coupling control strategy; 0.14 s, 0.33 s, 0.28 s of a fractional-order sliding mode cross-coupling control strategy. The root mean square error of the position error of the designed control strategy is 6.47 × 10−6 rad, 3.69 × 10−4 rad, 6.91 × 10−3 rad, respectively. The root mean square error of the synchronization error is 3.96×10−4 rad, 1.36×10−3 rad, 7.81×10−3 rad, superior to the other three control strategies. The results illustrate the effectiveness of the proposed control method.
Źródło:
Archives of Electrical Engineering; 2020, 69, 3; 499-519
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza liganda Sym-Phos {dicykloheksylo[3-(2,4,6-trimetoksyfenylo)-4-metoksynaft-2-yl]fosfina} i jego zastosowanie w reakcji Suzuki-Miyaura
Synthesis of Sym-Phos {dicyclohexyl-[3-(2,4,6-trimethoxyphenyl)-4-methoxynaphth-2-yl]phosphine} ligand and its application in Suzuki-Miyaura reaction
Autorzy:
Kielar, K.
Demchuk, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1217096.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
sprzęganie krzyżowe
C,P-kompleksowanie
ligandy fosfinowe
reakcja Suzuki-Miyaura
kataliza homogeniczna
kompleksy palladowe
cross-coupling
C,P-complexation
phosphorus ligand
Suzuki-Miyaura reaction
homogeneous catalysis
palladium complexes
Opis:
Przedstawiono tanią, szybką oraz wydajną trzyetapową syntezę odpornego na działanie powietrza ligandu Sym-Phos o C,P-typie kompleksowania. Sym-Phos tworzy skuteczne palladowe katalizatory, mające wykorzystanie w trudnych przypadkach reakcji sprzęgania krzyżowego, prowadzonych w przyjaznych środowisku warunkach (woda, otwarta kolba, umiarkowana temperatura).
We present cheap, quick and efficient three-phase synthesis of air-resistant Sym-Phos ligand {dicyclohexyl[3-(2,4,6-trimethoxyphenyl)-4-methoxynaphth-2-yl]phosphine} of C,P-type complexes. Sym-Phos creates effective palladium catalysts to be used in difficult cases of cross-coupling reactions carried out under favourable conditions for the environment (water, unplugged flask, moderate temperature).
Źródło:
Chemik; 2012, 66, 6; 585-594
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sex propheromone of the pine tree lappet moth Dendrolimus pini and its use in attractant-based monitoring system
Autorzy:
Grodner, J.
Zander, R.
Powiązania:
https://bibliotekanauki.pl/articles/55011.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
cross-coupling reaction
stereoselective reduction
acetal
aldehyde
attractant
Lepidoptera
Lasiocampidae
Pinus sylvestris
field experiment
Scotch pine
sex pheromone
pine tree
lappet moth
Dendrolimus pini
attractant-based monitoring system
needle
forest
Polska
monitoring
insecticide
plant protection
Opis:
The study presents a new strategy of synthesis of the pine-tree lappet moth sex pheromone via hydrolysis of the (5Z,7E)-1,1-diethoxy-5,7-dodecadiene (propheromone) and their using in biological tests with pheromone traps. The field trials showed that a sticky delta traps with propheromone at dose of 2.4 mg was the most suitable for monitoring of the population of the pine tree lappet moth.
Źródło:
Pestycydy; 2010, 1-4
0208-8703
Pojawia się w:
Pestycydy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and simulation analysis of an integrated xyz micro-actuator for controlling displacement of a scanning probe
Autorzy:
Dang, Van Hieu
Le, Van Tam
Hane, Kazuhiro
Chu, Manh Hoang
Powiązania:
https://bibliotekanauki.pl/articles/1839698.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
integrated xyz micro-actuator
mode cross-talk
mechanical coupling bridge
electrical isolation trench
Opis:
We report an integrated micro-actuator for independent control of the displacement in three orthogonal directions. Electrostatic comb drives are employed for controlling the displace- ment in the x and y directions while a parallel plate-type actuation is used for driving the displacement in the z direction. The three actuators are mechanically coupled, but are elec- trically isolated. The calculation models are established for investigating the operation char- acteristics of the micro-actuator. The calculated results are in good agreement with those obtained by the finite element method in Comsol Multiphysics 4.3. The results of modal analysis show that the displacement in the three orthogonal directions can be independently controlled with low mode cross-talk.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 1; 143-156
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
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