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Letteratura scientifica selezionata sul tema "Static pull characteristic"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 3 febbraio 2022

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Articoli di riviste sul tema "Static pull characteristic"

Jalali, A., and S. E. Khadem. "Pull-In Analysis of a Nonlinear Viscoelastic Nanocomposite Microplate Under an Electrostatic Actuation." Journal of Mechanics 28, no. 1 (2012): 179–89. http://dx.doi.org/10.1017/jmech.2012.19.

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ABSTRACTIn this paper, the deflection, natural frequency and damping quality factor of a viscoelastic microplate under an electrostatic actuation are investigated. The microplate is assumed as a CNT-reinforced nanocomposite microplate, and an electrostatic actuation is applied on it. The nonlinear equations of motion are derived using the Von-Karman plate theory, and the Kelvin-Voigt viscoelastic model. In order to obtain the material properties of the nanocomposite microplate, the Eshelby–Mori–Tanaka method is implemented. The static pull-in instability of the microplate is obtained. It is sh

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Jafarsadeghi-Pournaki, Ilgar, Ghader Rezazadeh, and Rasool Shabani. "Nonlinear Instability Modeling of a Nonlocal Strain Gradient Functionally Graded Capacitive Nano-Bridge in Thermal Environment." International Journal of Applied Mechanics 10, no. 08 (2018): 1850083. http://dx.doi.org/10.1142/s1758825118500837.

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This paper develops a theoretical model directed towards investigation of the static pull-in instability of a functionally graded (FG) electrostatically actuated nano-bridge via nonlocal strain gradient theory (NLSGT) of elasticity and Euler–Bernoulli beam theory in thermal environment. The nano-beam is under the influence of electrostatic and van der Waals (vdW) forces. In addition to the nonlinear nature of the electrostatic force, the other type of nonlinearity namely geometric nonlinearity resulting from the mid-plane stretching is considered. Material properties of FG nano-beam are assume

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He, Yu-Ling, Wei-Qi Deng, Bo Peng, et al. "Stator Vibration Characteristic Identification of Turbogenerator among Single and Composite Faults Composed of Static Air-Gap Eccentricity and Rotor Interturn Short Circuit." Shock and Vibration 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/5971081.

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This paper investigates the radial stator vibration characteristics of turbogenerator under the static air-gap eccentricity (SAGE) fault, the rotor interturn short circuit (RISC) fault, and the composite faults (CFs) composed of SAGE and RISC, respectively. Firstly, the impact of the faulty types on the magnetic flux density (MFD) is analyzed, based on which the detailed expressions of the magnetic pull per unit area (MPPUA) on the stator under different performing conditions are deduced. Then, numerical FEM simulations based on Ansoft and an experimental study are carried out, taking the SDF-

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Sagi, Padma, Tim Newson, Craig Miller, and Stephen Mitchell. "Stem and root system response of a Norway spruce tree (Picea abies L.) under static loading." Forestry: An International Journal of Forest Research 92, no. 4 (2019): 460–72. http://dx.doi.org/10.1093/forestry/cpz042.

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Abstract The mechanical response of a well-instrumented Norway spruce (Picea abies L.) tree under controlled winch loading was monitored. The main aims of this study were to understand the tree-root-soil response to lateral pull loads, to examine the applicability of simple engineering principles to the tree-root-soil response and to introduce a soil component into the tree stability analysis. The stem response was recorded with tilt sensors at three different heights; two sensors at each height tracked the response in transverse directions. These data were used to derive deflection and bendin

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Han, Bangcheng, Shiqiang Zheng, and Xiquan Liu. "Unbalanced Magnetic Pull Effect on Stiffness Models of Active Magnetic Bearing due to Rotor Eccentricity in Brushless DC Motor Using Finite Element Method." Mathematical Problems in Engineering 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/745912.

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We firstly report on an investigation into the unbalanced magnetic pull (UMP) effect on the static stiffness models of radial active magnetic bearing (RAMB) in brushless DC motor (BDCM) in no-loaded and loaded conditions using the finite element method (FEM). The influences of the UMP on the force-control current, force-position, current stiffness, and position stiffness of RAMB are clarified in BDCM with 100 kW rated power. We found the position stiffness to be more susceptible to UMP. The primary source of UMP is the permanent magnets of BDCM. In addition, the performance of RAMB is affected

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Komatsu, Kohei, Qicheng Teng, Zherui Li, Xiaolan Zhang, and Zeli Que. "Experimental and analytical investigation on the nonlinear behaviors of glulam moment-resisting joints composed of inclined self-tapping screws with steel side plates." Advances in Structural Engineering 22, no. 15 (2019): 3190–206. http://dx.doi.org/10.1177/1369433219858722.

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Glulam moment-resisting joint composed of inclined self-tapping screws with steel side plates were designed and its nonlinear moment-rotational skeleton curve was predicted by taking nonlinear load ( P)–deformation ( u) relationships of all moment-resisting components into considerations within step-wise linear calculation process. P-u relationships of all moment-resisting components were estimated by the fundamental shear joint tests or appropriate empirical relationships, and they were approximated by the tetra polygonal line curves or bi-linear curves. The extended Normalized Characteristic

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Maier, Johanna, Christian Vogel, Tobias Lebelt, et al. "Adhesion Studies during Generative Hybridization of Textile-Reinforced Thermoplastic Composites via Additive Manufacturing." Materials 14, no. 14 (2021): 3888. http://dx.doi.org/10.3390/ma14143888.

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Generative hybridization enables the efficient production of lightweight structures by combining classic manufacturing processes with additive manufacturing technologies. This type of functionalization process allows components with high geometric complexity and high mechanical properties to be produced efficiently in small series without the need for additional molds. In this study, hybrid specimens were generated by additively depositing PA6 (polyamide 6) via fused layer modeling (FLM) onto continuous woven fiber GF/PA6 (glass fiber/polyamide 6) flat preforms. Specifically, the effects of su

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Wan, Shuting, and Yuling He. "INVESTIGATION ON STATOR AND ROTOR VIBRATION CHARACTERISTICS OF TURBO-GENERATOR UNDER AIR GAP ECCENTRICITY FAULT." Transactions of the Canadian Society for Mechanical Engineering 35, no. 2 (2011): 161–76. http://dx.doi.org/10.1139/tcsme-2011-0010.

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This paper investigates the stator and the rotor vibration characteristics of turbo-generator under the air gap eccentricity fault. Firstly the air gap magnetic flux density of the fault is deduced, and the formula of the magnetic pull per unit area acting on the stator and the unbalanced magnetic pulls of x-axis and y-axis acting on the rotor are respectively gotten. Then the static eccentricity, the dynamic eccentricity and the mixed eccentricity are respectively studied to analyze the stator and the rotor vibration characteristics. Finally experiments are done on a SDF-9 non-salient fault s

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Dequesnes, Marc, Zhi Tang, and N. R. Aluru. "Static and Dynamic Analysis of Carbon Nanotube-Based Switches." Journal of Engineering Materials and Technology 126, no. 3 (2004): 230–37. http://dx.doi.org/10.1115/1.1751180.

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In this paper, we report on molecular dynamics (MD), continuum (based on linear and nonlinear beam theories) and combined molecular dynamics/continuum simulation of carbon nanotube based nanoelectromechanical switches. As a prototype device, we study the pull-in voltage characteristics of a nanoelectromechanical switch made of a suspended single wall nanotube over a ground plane. The various simulations (MD, continuum and combined MD/continuum) have been performed accounting for the electrostatic and van der Waals forces between the nanotube and the ground plane. The results from the nonlinear

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Lazić, Predrag, Đurica Nikšić, and Dejan Stojanović. "Replacement of old flotation cells in the flotation plant of the Lece mine." Tehnika 76, no. 1 (2021): 27–31. http://dx.doi.org/10.5937/tehnika2101027l.

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Russian made FPM-GMO-1.6 flotation machines were previously installed for primary stage flotation concentration of lead and zinc minerals in Lece flotation plant. For cleaning stage FMR-10 flotation machines were in use. Beside low technological characteristic, hard maintenance and worn out are characteristic of this machines. In order to modernize the production and eliminate the above shortcomings primarily in the process of lead minerals flotation, in 2020, the old flotation cells were replaced with new ones. Currently, 8 new RCS-5 cells for coarse and scavengel flotation of lead minerals a

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Più fonti

Tesi sul tema "Static pull characteristic"

Steidl, Adam. "Výpočet stejnosměrného elektromagnetu a jeho experimentální ověření." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-220979.

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Content of this thesis deals with electromagnets as operating elements in electric machines. Thesis is divided in two main parts, theoretical and practical. The theoretical part describes electromagnets as electric machine , usage of electromagnets in electrical devices as operating element. Electromagnets are further divided in groups on basis of different criteria. Next, the theory of electromagnetic fields and methods of assesment of static pull and dynamic characteristics is described. Construction and function analysis of researched electromagnet with permanent magnets, which serves as tr

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Libri sul tema "Static pull characteristic"

Kudinov, V. V., N. V. Korneeva, and I. K. Krylov. Effect of components on the properties of composite materials. Nauka Publishers, 2021. http://dx.doi.org/10.7868/9785020408654.

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Methods for the creation and characteristics of composite materials reinforced with carbon, aramid and UHMWPE-fibers based on polymer matrices are considered. The properties of more than 50 composite materials are given. Technologies for their production from wound nonwoven and woven fiber reinforcements are proposed, with regulation of activation, composition and arrangement of components in the material. Experimental methods for studying polymer com- posites, such as wet-pull-out (W-P-O), full-pull-out (F-P-O) and impact break (IB) have been developed. It allows one to study the interfacial

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Blundell, Katherine. 3. Characterizing black holes. Oxford University Press, 2015. http://dx.doi.org/10.1093/actrade/9780199602667.003.0003.

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‘Characterizing black holes’ describes the two different types of black holes: Schwarzschild black holes that do not rotate and Kerr black holes that do. The only distinguishing characteristics of black holes are their mass and their spin. A remarkable feature of a spinning black hole is that the gravitational field pulls objects around the black hole’s axis of rotation, not merely in towards its centre—an effect called frame dragging. The static limit and ergosphere regions of black holes are also described. Einstein’s equations of General Relativity allow many different solutions describing

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Capitoli di libri sul tema "Static pull characteristic"

Guffey, Ryan Vance. "Globalization, Cross Border Education, and Student Migration." In Handbook of Research on Advancing Critical Thinking in Higher Education. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8411-9.ch017.

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Presently, there are more than two million students studying outside their home countries and the total number is expected to grow to eight million by 2025. This trend has inspired research into the “push” and “pull” factors that drive student mobility within the global higher education environment. However, despite the growing presence of cross border student enrollments throughout the United States, which is also the number one location for cross border students to study in the world, limited efforts have been made to identify what characteristics motivate particular groups of cross border students to leave their home countries to attend particular types of higher education in the United States. This chapter addresses that gap in the literature. In response, this study sought to build upon existing global higher education literature by determining the relationship between the perceived importance of institutional characteristics and cross border students' age, gender, and country of origin.

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Glennon, Michael J. "The Trumanite Network." In National Security and Double Government. Oxford University Press, 2014. http://dx.doi.org/10.1093/acprof:oso/9780190206444.003.0002.

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This chapter describes the origins, operation, and characteristics of the Trumanite network that defines and manages U.S. security policy. The network emerged during the Truman administration, with the support of liberal democrats in Congress and over the opposition of conservative Republicans, who expressed concern about creating a “Gestapo” or “garrison state” run by “power-grabbing bureaucrats.” The tightly knit network consists today of the several hundred officials who run the nation’s vast military, intelligence, law enforcement, and diplomatic apparatus, which is largely removed from public view. They are expert, efficient, hard-working, secretive, nonideological, and process-oriented, inclined to stick with existing policy, define security in military terms, exaggerate security threats, eschew dissent, and resist accountability. The gravitational pull leads to groupthink, excessive path dependence, and security programs that are “sticky down.”

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Atti di convegni sul tema "Static pull characteristic"

Jeong, David Y. "Analyses for Lateral Deflection of Railroad Track Under Quasi-Static Loading." In ASME 2013 Rail Transportation Division Fall Technical Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/rtdf2013-4710.

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This paper describes analyses to examine the lateral deflection of railroad track subjected to quasi-static loading. Rails are assumed to behave as beams in bending. Movement of the track in the lateral plane is constrained by idealized resistance characteristics, while movement in the vertical plane is resisted by a continuous, linear and elastic foundation. These analyses are based on solving the ordinary differential equations for beam deflections. In certain cases, convenient mathematical expressions may be used to represent idealized lateral resistance characteristics and derive closed-fo

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Krylov, Slava, and Nir Dick. "Pull-In Dynamics of Electrostatically Actuated Bistable Micro Beam." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87236.

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Results of theoretical investigation of the transient dynamics of an initially curved electrostatically actuated clamped-clamped micro beam are presented. A reduced order model of the shallow Euler-Bernoulli arch developed using the Galerkin procedure with eigenmodes of a straight beam as a basis accounts for the distributed electrostatic and inertial loading, fringing electric fields and nonlinear squeeze film damping. Due to the unique combination of mechanical and electrostatic nonlinearities which is intrinsic in micro devices but is not encountered naturally in large-scale structures, the

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Snow, Michael G., and Anil K. Bajaj. "Comprehensive Reduced-Order Models of Electrostatically Actuated MEMS Switches and Their Dynamics Including Impact and Bounce." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28590.

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As MEMS technology develops it is becoming better understood that MEMS designers must account for the large uncertainties characteristic of the relevant manufacturing processes. Uncertainty quantification tasks the designer with evaluating many different possible outcomes from the manufacturing process which creates a demand for models that are accurate and comprehensive, yet fast to evaluate. This work presents a comprehensive reduced-order model of electrostatically actuated switches incorporating a range of effects that are typically included only in FE modeling codes. Specifically, the mod

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Sajadi, Banafsheh, Farbod Alijani, Hans Goosen, and Fred van Keulen. "Static and Dynamic Pull-In of Electrically Actuated Circular Micro-Membranes." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67336.

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Micro-Electro-Mechanical devices have shown enormous popularity in engineering devices as sensors and actuators. In this paper, the instability, i.e. the dynamic pull-in behavior, of an electrically actuated circular micro-membrane is studied. In order to investigate the periodic solutions, detect bifurcations and follow branches of the solution, the non-linear equation of motion is derived using an energy approach, and, is solved by using a pseudo arc-length continuation and collocation technique. It has been shown that, both hardening and/or softening nonlinear responses could emerge dependi

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Ninomiya, Tamotsu, Tooru Higashi, Koosuke Harada, Naoki Tsuya, Toshio Gohnai, and Yukihiro Honda. "Analysis of the static and dynamic characteristics of push-pull parallel resonant converters." In 1986 17th Annual IEEE Power Electronics Specialists Conference. IEEE, 1986. http://dx.doi.org/10.1109/pesc.1986.7415583.

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Jalali, Amir, and Siamak E. Khadem. "Static Pull-In Analysis of a Carbon Nano Tube (CNT)-Reinforced Microplate Under Electrostatic Actuation." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25395.

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In this paper, nonlinear vibration characteristics of a viscoelastic microplate under electrostatic actuation have been obtained. The microplate has been assumed as a CNT-reinforced simply supported square plate and an electrostatic actuation applied on it. The nonlinear equations of motion have been derived and solved, by using combined Galerkin method and indeterminate coefficient procedure. Static pull-in instability of the microplate has been also derived. It has been shown that the pull-in voltage, natural frequency and deflection of the system depend on the value of electrostatic actuati

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Chen, Lei, Yan Du, Nicol E. McGruer, and George G. Adams. "Ductile Separation and Its Role in the Evolution of Gold Contacts." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44152.

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In this paper, we study the role of ductile separation on the evolution of gold-on-gold micro-contacts. A specially designed SPM contact test station has been used to conduct the cycling tests. The evolution of contacts is studied by monitoring the characteristics of the pull-off force. The magnitude of the pull-off force, the force vs. displacement curves, and the rate-dependent pull-off force are sampled during cycling. It is found that ductile separation causes significant and random modification of the contact surfaces. The magnitude of the pull-off force also changes due to the variation

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Ilyas, Saad, Nizar Jaber, and Mohammad I. Younis. "Static and Dynamic Amplification Using Strong Mechanical Coupling." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66104.

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Amplifying the signal-to-noise ratio of resonant sensors is vital toward the effort to miniaturize devices into the sub-micro and nano regimes. In this work, we demonstrate theoretically and experimentally amplification through mechanically coupled microbeams. The device is composed of two identical clamped-clamped beams, made of polyimide, connected at their middle through a third beam, which acts as a mechanical coupler. Each of the clamped-clamped microbeams and the coupler are designed to be actuated separately, hence providing different possibilities of actuation and sensing. The coupled

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Rasekh, M., S. E. Khadem, and M. Tatari. "Noise Immunity of Carbon Nanotube Based Switches." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25162.

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In this paper, two terminals, doubly clamped, nano-switch has been studied. Here the interest of this study is the situation in which the pull-in and pull-out voltages not be same as each other and the pull-in/pull-out trend follows a hysteresis loop. This property could be used to introduce a double threshold switch with greater stability or noise immunity. With only one input threshold, a noisy input voltage signal near that threshold could cause the output to switch rapidly back. The model comprises a clamped-clamped carbon nanotube (CNT) suspended over a graphite ground electrode plate fro

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Kahrobaiyan, M. H., I. Vardi, M. T. Ahmadian, and S. Henein. "Investigating the Size-Dependent Static and Dynamic Behavior of Circular Micro-Plates Subjected to Capillary Force." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46487.

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The size-dependent static deflection, pull-in instability and resonant frequency of a circular microplate under capillary force have been studied using modified couple stress elasticity theory. Size-dependency is a phenomenon in which the normalized quantities that classical elasticity theory predicts to be independent of the structure size, such as normalized deflection or normalized frequency, vary significantly as the structure size changes. This phenomenon has been observed in micro-scale structures such as micro-electro-mechanical-systems (MEMS). Since classical elasticity theory is unabl

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Rapporti di organizzazioni sul tema "Static pull characteristic"

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF PEC COMPOSITE COLUMN-STEEL BEAM FRAME WITH WELDED T-STUB STRENGTHENED CONNECTIONS. The Hong Kong Institute of Steel Construction, 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.5.

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Seismic performance of innovative Partially Encased Composite (PEC) column-steel beam composite frame was investigated, where the connection was strengthened by the welded T-stub. A ½ scale, two-storey, and one bay composite frame specimen was designed and fabricated for the quasi-static test. Through the experimental observation and measurements, the seismic performance were evaluated, including hysteretic characteristic, lateral stiffness, seismic energy dissipation, and ductility. The plastic damage evolution process and ductile failure mode were clarified. The results indicated that the we

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