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Artículos de revistas sobre el tema "Forced responce"

Autor: Grafiati
Publicado: 10 de marzo de 2023

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1

McCuaig Edge, Heather, Samantha Carlucci, and Diane Lu. "Rôle de la Direction de la protection de la santé de la Force dans la réponse des Forces armées canadiennes à la pandémie de COVID-19." Relevé des maladies transmissibles au Canada 46, no. 09 (2020): 314–17. http://dx.doi.org/10.14745/ccdr.v46i09a05f.

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2

Mihalka, Michael. "NATO Response Force: Rapid? Responsive? A Force?" Connections: The Quarterly Journal 04, no. 2 (2005): 67–79. http://dx.doi.org/10.11610/connections.04.2.09.

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3

Setúbal, Fábio Antônio do Nascimento, Sérgio de Souza Custódio Filho, Newton Sure Soeiro, Alexandre Luiz Amarante Mesquita, and Marcus Vinicius Alves Nunes. "Force Identification from Vibration Data by Response Surface and Random Forest Regression Algorithms." Energies 15, no. 10 (2022): 3786. http://dx.doi.org/10.3390/en15103786.

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Several dynamic projects and fault diagnosis of mechanical structures require the knowledge of the acting external forces. However, the measurement of such forces is often difficult or even impossible; in such cases, an inverse problem must be solved. This paper proposes a force identification method that uses the response surface methodology (RSM) based on central composite design (CCD) in conjunction with a random forest regression algorithm. The procedure initially required the finite element modal model of the forced structure. Harmonic analyses were then performed with varied parameters o
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4

Ahmed, Rizwan, Christian Maria Firrone, and Stefano Zucca. "Design and Calibration of a Tri-Directional Contact Force Measurement System." Applied Sciences 11, no. 2 (2021): 877. http://dx.doi.org/10.3390/app11020877.

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In low pressure turbine stages, adjacent blades are coupled to each other at their tip by covers, called shrouds. Three-dimensional periodic contact forces at shrouds strongly affect the blade vibration level as energy is dissipated by friction. To validate contact models developed for the prediction of nonlinear forced response of shrouded blades, direct contact force measurement during dynamic tests is mandatory. In case of shrouded blades, the existing unidirectional and bi-directional contact force measurement methods need to be improved and extended to a tri-directional measurement of shr
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5

Yang, B. D., and C. H. Menq. "Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading: Part 2—Prediction of Forced Response and Experimental Verification." Journal of Engineering for Gas Turbines and Power 120, no. 2 (1998): 418–23. http://dx.doi.org/10.1115/1.2818139.

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In the second part of this paper, the application of the proposed dual-interface model to the prediction of the forced response of a blade constrained by wedge dampers will be presented. When considering cyclic loading, the induced friction forces and contact normal loads are combined so as to determine the effective stiffness and damping of the friction interfaces over a cycle of motion. The harmonic balance method is then used to impose the approximate stiffness and damping of the friction interfaces to a linear structure model of the blade. This approach results in a set of nonlinear algebr
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6

Otsuru, Yoshihide, Yuichi Kurita, Koji Kawaguchi, et al. "Palpation force display by enhancing the force response of a surgical training phantom." Abstracts of the international conference on advanced mechatronics : toward evolutionary fusion of IT and mechatronics : ICAM 2015.6 (2015): 19–20. http://dx.doi.org/10.1299/jsmeicam.2015.6.19.

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7

Nikolic, M., E. P. Petrov, and D. J. Ewins. "Coriolis Forces in Forced Response Analysis of Mistuned Bladed Disks." Journal of Turbomachinery 129, no. 4 (2006): 730–39. http://dx.doi.org/10.1115/1.2720866.

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The problem of estimating the mutual interaction of the effects of Coriolis forces and of blade mistuning on the vibration characteristics of bladed disks is addressed in this paper. The influence of different degrees of mistuning on forced response and amplification factors are studied in the presence of Coriolis forces and then compared to their non-Coriolis counterparts using a computationally inexpensive, yet representative, model of a bladed disk. The primary objective of the study reported in this paper is to establish whether current mistuned bladed disk analyses should incorporate Cori
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8

KANEKO, Yasutomo, Kazushi MORI, Toshio WATANABE, and Hiroharu OOYAMA. "ICOPE-15-1006 Study on forced response of grouped steam turbine vanes." Proceedings of the International Conference on Power Engineering (ICOPE) 2015.12 (2015): _ICOPE—15——_ICOPE—15—. http://dx.doi.org/10.1299/jsmeicope.2015.12._icope-15-_3.

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9

Yang, B. D., and C. H. Menq. "Modeling of Friction Contact and Its Application to the Design of Shroud Contact." Journal of Engineering for Gas Turbines and Power 119, no. 4 (1997): 958–63. http://dx.doi.org/10.1115/1.2817082.

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Designers of aircraft engines frequently employ shrouds in turbine design. In this paper, a variable normal load friction force model is proposed to investigate the influence of shroudlike contact kinematics on the forced response of frictionally constrained turbine blades. Analytical criteria are formulated to predict the transitions between stick, slip, and separation of the interface so as to assess the induced friction forces. When considering cyclic loading, the induced friction forces are combined with the variable normal load so as to determine the effective stiffness and damping of the
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10

Kan, Xuanen, and Bo Zhao. "Vibration Characteristics of a Mistuned Bladed Disk considering the Effect of Coriolis Forces." Shock and Vibration 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/4656032.

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To investigate the influence of Coriolis force on vibration characteristics of mistuned bladed disk, a bladed disk with 22 blades is employed and the effects of different rotational speeds and excitation engine orders on the maximum forced response are discussed considering the effects of Coriolis forces. The results show that if there are frequency veering regions, the largest split of double natural frequencies of each modal family considering the effects of Coriolis forces appears at frequency veering region. In addition, the amplitude magnification factor considering the Coriolis effects i
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11

Li, Xiang Guang, Qin Wen Huang, Yun Hui Wang, Yu Bin Jia, and Zhi Bin Wang. "The Response of Electrostatic MEMS Structure under Mechanical Shock and Electrostatic Forces." Applied Mechanics and Materials 427-429 (September 2013): 120–23. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.120.

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For MEMS devices actuated by electrostatic force, unexpected failure modes can be hardly predicted when the electrostatic force coupled with the shock. A response model is established when a micro cantilever subjected to electrostatic force and mechanical shock. First, based on the theory of transverse forced vibration in vibration mechanics, the equation of motion under shock and electrostatic fore is presented. Then the reduced order model is gained after simplifying by mode superposition method. The computing results indicate that: the shock amplitude and duration are the key factors to aff
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12

Jahng, Junghoon, Eric O. Potma, and Eun Seong Lee. "Nanoscale spectroscopic origins of photoinduced tip–sample force in the midinfrared." Proceedings of the National Academy of Sciences 116, no. 52 (2019): 26359–66. http://dx.doi.org/10.1073/pnas.1913729116.

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When light illuminates the junction formed between a sharp metal tip and a sample, different mechanisms can contribute to the measured photoinduced force simultaneously. Of particular interest are the instantaneous force between the induced dipoles in the tip and in the sample, and the force related to thermal heating of the junction. A key difference between these 2 force mechanisms is their spectral behavior. The magnitude of the thermal response follows a dissipative (absorptive) Lorentzian line shape, which measures the heat exchange between light and matter, while the induced dipole respo
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13

PRAJINA N V, PRAJINA N. V., and T. D. JOHN T D JOHN. "Multi Response Optimization of Cutting Forces in End Milling Using Response Surface Methodology and Desirability Function." International Journal of Scientific Research 2, no. 5 (2012): 126–30. http://dx.doi.org/10.15373/22778179/may2013/45.

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14

Bucher, Izhak, and Moshe Rosenstein. "Determination of External Forces—Application to the Calibration of an Electromagnetic Actuator." Journal of Vibration and Acoustics 128, no. 5 (2005): 545–54. http://dx.doi.org/10.1115/1.2346699.

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A new method to estimate time-varying external forces acting upon a vibrating structure is presented in this paper. The method is developed for a force-calibrating device which is designed to be rigid in the operating frequency band and, therefore, it was believed that simple force-gauges should recover the applied forces. It has been observed that the inertia of the vibrating calibration device distorts the estimated force, even when the excitation is only one-third of the first natural frequency. Unlike traditional methods, the frequency response need not be inverted, alternatively a smoothe
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15

Paulson, T. J., and D. P. Abrams. "Correlation between Static and Dynamic Response of Model Masonry Structures." Earthquake Spectra 6, no. 3 (1990): 573–91. http://dx.doi.org/10.1193/1.1585587.

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The paper presents correlations between response of the same structural system subjected to either dynamic shaking or static lateral forces. Two one-quarter scale test structures were constructed with identical designs and were tested in the laboratory using two different methods. The first structure was subjected to simulated earthquake motions on a shaking table while the second structure was forced to displace through the same history at static rates using computer controlled servohydraulic actuators. Characteristics of dynamic lateral force distributions are examined first and followed by
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16

Saito, Akira, and Tatsuya Suzuki. "Forced response vibration analysis of induction motor stators induced by electromagnetic forces." IFAC-PapersOnLine 55, no. 27 (2022): 155–59. http://dx.doi.org/10.1016/j.ifacol.2022.10.504.

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17

Moe, G., and Z. J. Wu. "The Lift Force on a Cylinder Vibrating in a Current." Journal of Offshore Mechanics and Arctic Engineering 112, no. 4 (1990): 297–303. http://dx.doi.org/10.1115/1.2919870.

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This paper reports an extensive program of forced and free vibration tests on a single circular cylinder moving mainly perpendicularly to a uniform current. For both free and forced vibration tests, two cases were investigated: one in which the cylinder was restrained in the in-line direction and the other in which it was supported on suitable springs. The cross-flow vibrational response and hydrodynamic forces on the cylinder were measured. Large variations of motion frequency in the “lock-in” range were found from the free vibration tests. This leads to two different definitions of reduced v
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18

Rosenfeld, Dekel, Shira Landau, Yulia Shandalov, et al. "Morphogenesis of 3D vascular networks is regulated by tensile forces." Proceedings of the National Academy of Sciences 113, no. 12 (2016): 3215–20. http://dx.doi.org/10.1073/pnas.1522273113.

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Understanding the forces controlling vascular network properties and morphology can enhance in vitro tissue vascularization and graft integration prospects. This work assessed the effect of uniaxial cell-induced and externally applied tensile forces on the morphology of vascular networks formed within fibroblast and endothelial cell-embedded 3D polymeric constructs. Force intensity correlated with network quality, as verified by inhibition of force and of angiogenesis-related regulators. Tensile forces during vessel formation resulted in parallel vessel orientation under static stretching and
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19

Vuksanović Herceg, Iva, Vukašin Kuč, Veljko M. Mijušković, and Tomislav Herceg. "Challenges and Driving Forces for Industry 4.0 Implementation." Sustainability 12, no. 10 (2020): 4208. http://dx.doi.org/10.3390/su12104208.

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Industry 4.0 has been a major force framing the societal, economic and technological environment after 2010. Exposed to ongoing digital transformation, companies are able to exploit opportunities offered by Industry 4.0, and are forced to manage immanent risks and barriers. However, studies on opportunities and challenges relevant for the implementation of Industry 4.0 for companies are scarce. In response to this literature gap, the aim of this exploratory research is to provide a deeper analysis of the level of digital transformation of companies in Serbia based on a digital maturity model,
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20

Gao, Shuxiang, and Ying Ye. "Acute Vascular Response of Hand to Force and Vibration." Vibration 5, no. 1 (2022): 153–64. http://dx.doi.org/10.3390/vibration5010010.

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This study aimed to investigate the acute effect of grip and feed exertions on the vascular system at the fingers during exposure to hand-arm vibration (HAV), and to identify which active hand force situation would have the most effect on finger vascular function. A total of 12 individuals attended the test, and each of them were subjected to eight sets of force-and-vibration situations: four with combinations of forces and vibration, and four control ones with only hand forces applied. The vibration stimulus was applied on the right hand at 2.75 m/s2 with a frequency of 125 Hz for three minut
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21

Tagarev, Todor, and Valeri Ratchev. "Evolving Models of Using Armed Forces in Domestic Disaster Response and Relief." Information & Security: An International Journal 40, no. 2 (2018): 167–80. http://dx.doi.org/10.11610/isij.4012.

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22

Kenyon, J. A., J. H. Griffin, and N. E. Kim. "Sensitivity of Tuned Bladed Disk Response to Frequency Veering." Journal of Engineering for Gas Turbines and Power 127, no. 4 (2004): 835–42. http://dx.doi.org/10.1115/1.1924486.

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A continuous method is presented for representing the mode interaction that occurs in frequency veering in terms of the nominal sector modes of a cyclic symmetric bladed disk model constrained at a reference interblade phase angle. Using this method, the effect of frequency veering on the mode shapes can be considered in the context of the generalized forces exciting the system and the modal response of the bladed disk. It is shown that in a blade-dominated family of modes, the transfer of modal energy to the disk in the veering results in a lower generalized force exciting the mode as well as
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23

Yao, Donghui, Yongsheng Ren, Yuhuan Zhang, and Bole Ma. "Nonlinear Dynamics of Cutting Process considering Higher-Order Deformation of Composite Cutting Tool." Shock and Vibration 2021 (December 2, 2021): 1–23. http://dx.doi.org/10.1155/2021/8699218.

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In this paper, the nonlinear dynamic analysis of the cutting process of composite cutting tool is performed. The cutting tool is simplified to a nonplanar bending rotating shaft. The higher-order bending deformation, structural damping, and gyroscopic effect of cutting tool are considered. It is assumed that cutting tool is subjected to a regenerative two-dimensional cutting force containing the first and second harmonic components. Based on the Hamilton principle, the motion equation of nonlinear chatter of the cutting system is derived. The nonlinear ordinary differential equations in the ge
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24

Huang, Shu Ke, Dan Chen Zhou, Jian Hui Liu, Jin Teng, and Ning Li. "Amplitude Frequency Response Characteristics of Fe-Based Damping Alloy Simple Beams under Forced Vibrations." Advanced Materials Research 328-330 (September 2011): 1072–76. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.1072.

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The amplitude frequency response characteristics of simple beams made by Fe-Mn damping alloy, Fe-Cr-Mo damping alloy and 0.45C-steel under forced vibrations were studied using forced vibration measurement instrument. The results indicated that at forced vibration condition, the damping behaviors of Fe-Mn and Fe-Cr-Mo alloy beams were that the resonance amplitude and the resonance frequency range were reduced. The higher the exciting force was, the better the damping capacity of Fe-Mn alloy beam was, so it was suitable for the environment where higher vibrating force and shock existed. Whatever
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25

Kan, Xuanen, Zili Xu, Bo Zhao, and Jize Zhong. "Effect of coriolis force on forced response magnification of intentionally mistuned bladed disk." Journal of Sound and Vibration 399 (July 2017): 124–36. http://dx.doi.org/10.1016/j.jsv.2017.03.002.

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26

Yuen, Steeve Chung Kim, Gerald Nurick, Sylvester Piu, and Gadija Ebrahim. "Response of Filled Thin-Walled Square Tubes to Axial Impact Load." Applied Mechanics and Materials 566 (June 2014): 586–92. http://dx.doi.org/10.4028/www.scientific.net/amm.566.586.

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This paper presents the results of an investigation into the response of thin-walled square (60x60 mm and 76x76 mm) tubes made from mild steel filled with four different fillers; aluminium foam (Cymat 7%), two types of aluminium honeycomb and polyurethane foam to quasi-static and dynamic axial impact load. The energy absorption characteristics of the foam-filled tubes are compared to that of a hollow tube, through efficiency calculations. The tubular structures are subjected to axial impact load generated by drop masses of 320 kg and 390 kg released from a height ranging between 2.1 m to 4.1 m
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27

Tho, Nguyen Chi, Nguyen Tri Ta, and Do Van Thom. "New Numerical Results from Simulations of Beams and Space Frame Systems with a Tuned Mass Damper." Materials 12, no. 8 (2019): 1329. http://dx.doi.org/10.3390/ma12081329.

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In working processes, mechanical systems are often affected by both internal and external forces, which are the cause of the forced vibrations of the structures. They can be destroyed if the amplitude of vibration reaches a high enough value. One of the most popular ways to reduce these forced vibrations is to attach tuned mass damper (TMD) devices, which are commonly added at the maximum displacement point of the structures. This paper presents the computed results of the free vibration and the vibration response of the space frame system under an external random load, which is described as a
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28

Ismail, Al Emran, Muhd Hafeez Zainulabidin, Mohd Nazrul Roslan, Abdul Latif Mohd Tobi, and Nik Hisyamudin Muhd Nor. "Effect of Velocity on the Impact Resistance of Woven Jute Fiber Reinforced Composites." Applied Mechanics and Materials 465-466 (December 2013): 1277–81. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.1277.

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is present project investigated the impact penetration response of woven jute fiber reinforced composites subjected to wide range of low impact velocities. Hand layout woven jute fibers are thermally compressed to ensure no internal defects formed in the composites. Six layers of woven jutes are stacked together using different fiber orientations [0/q/0]s. Low impact velocities are used ranging between 5 – 20 m/s. Force-time, force-displacement and energy-time curves are obtained automatically during the impact tests. The results are then discussed with considering the composite fragmentations
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29

Obara, Kazuo, Koji Nobe, Hiromi Nobe, Michael S. Kolodney, Primal De Lanerolle, and Richard J. Paul. "Effects of microtubules and microfilaments on [Ca2+]i and contractility in a reconstituted fibroblast fiber." American Journal of Physiology-Cell Physiology 279, no. 3 (2000): C785—C796. http://dx.doi.org/10.1152/ajpcell.2000.279.3.c785.

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We used a reconstituted fiber formed when 3T3 fibroblasts are grown in collagen to characterize nonmuscle contractility and Ca2+ signaling. Calf serum (CS) and thrombin elicited reversible contractures repeatable for >8 h. CS elicited dose-dependent increases in isometric force; 30% produced the largest forces of 106 ± 12 μN ( n = 30), which is estimated to be 0.5 mN/mm2 cell cross-sectional area. Half times for contraction and relaxation were 4.7 ± 0.3 and 3.1 ± 0.3 min at 37°C. With imposition of constant shortening velocities, force declined with time, yielding time-dependent force-veloc
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30

Liu, Xiaohui, Haobo Liang, Guangyun Min, Chuan Wu, and Mengqi Cai. "Investigation on the Nonlinear Vibration Characteristics of Current-Carrying Crescent Iced Conductors under Aerodynamic Forces, Ampere’s Forces, and Forced Excitation Conditions." Discrete Dynamics in Nature and Society 2021 (October 12, 2021): 1–22. http://dx.doi.org/10.1155/2021/5009209.

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Aiming at the problem of nonlinear vibration of current-carrying iced conductors, the aerodynamic forces are introduced into the previous vibration equation of current-carrying conductors that only considered Ampere’s forces. At the same time, on this basis, a forced excitation load is further introduced to study the influence of dynamic wind on the nonlinear vibration characteristics of current-carrying iced conductors, and a new current-carrying iced conductors system under the combined action of Ampere’s forces, forced excitation, and aerodynamic forces has been established, and the improve
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31

Libersat, F., S. Zill, and F. Clarac. "Single-unit responses and reflex effects of force-sensitive mechanoreceptors of the dactyl of the crab." Journal of Neurophysiology 57, no. 5 (1987): 1601–17. http://dx.doi.org/10.1152/jn.1987.57.5.1601.

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This paper examines the responses and reflex effects of force-sensitive mechanoreceptors of the most distal leg segment, the dactyl, of the leg of the crab, Carcinus maenas. The goals of these studies are to establish the potential activities and functions of these receptors in posture and locomotion. The responses of force-sensitive mechanoreceptors to imposed mechanical stimuli depended upon their location on the dactyl. A distal group of receptors is located on a specialized region, the dactyl tip, which is composed solely of epicuticle. Another group of receptors is distributed throughout
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32

Tang, D. M., and E. H. Dowell. "On the Threshold Force for Chaotic Motions for a Forced Buckled Beam." Journal of Applied Mechanics 55, no. 1 (1988): 190–96. http://dx.doi.org/10.1115/1.3173628.

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The effects of higher modes on the chaotic oscillations of a buckled beam under forced external excitation are studied. Of principal interest are the threshold force required for chaotic motions and the influence of damping on the system response. A comparison is also presented of results from numerical simulations with experimental data.
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33

Mitra, Anirban, Prasanta Sahoo, and Kashinath Saha. "Large Amplitude Forced Vibration Analysis of Stiffened Plates Under Harmonic Excitation." International Journal of Manufacturing, Materials, and Mechanical Engineering 1, no. 2 (2011): 62–98. http://dx.doi.org/10.4018/ijmmme.2011040105.

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Large amplitude forced vibration behaviour of stiffened plates under harmonic excitation is studied numerically incorporating the effect of geometric non-linearity. The forced vibration analysis is carried out in an indirect way in which the dynamic system is assumed to satisfy the force equilibrium condition at peak excitation amplitude. Large amplitude free vibration analysis of the same system is carried out separately to determine the backbone curves. The mathematical formulation is based on energy principles and the set of governing equations for both forced and free vibration problems de
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34

Saniee, Avva, Kihyuck Kwak, Nicolas Quizon, et al. "Human germinal center B cells are intrinsically able to discriminate antigen affinity and with T cell help express plasma cell transcription factors." Journal of Immunology 200, no. 1_Supplement (2018): 107.17. http://dx.doi.org/10.4049/jimmunol.200.supp.107.17.

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Abstract The selection of GC B cells that express high affinity B cell receptors (BCRs) is driven by the ability of B cells to both signal through the BCR and to extract antigen and present it to follicular helper T cells (T FH cells). Using anti-kappa antibodies of low (KD=3.9×10 −7 ) versus high (KD=2.4×10 −9 ) affinities attached to membranes as surrogate antigens, we show that LZ GC B cells are able to discriminate between these and responded only to the high affinity antigen. In contrast, naïve B cells responded to both high and low affinity antigens. LZ GC B cells engaged membrane associ
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35

Bar-Avi, Patrick. "Dynamic Response of Risers Conveying Fluid." Journal of Offshore Mechanics and Arctic Engineering 122, no. 3 (2000): 188–93. http://dx.doi.org/10.1115/1.1286517.

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Riser conveying fluid is one category in a wide research area known as moving continua dynamic that was the subject to many research studies in the past 50 yr. The structure investigated in this paper is assumed to be a flexible pipe having a geometry of a simple catenary with a buoyancy force at the top. The riser is modeled as a beamlike continuous system subjected to wave, current, and wind forces. The derivation of the partial differential equation of motion included the following aspects: nonlinearities due to geometry, i.e., large displacements as well as wave drag force, fluid internal
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36

Cha, Myeounghoon, Jennifer Ling, Guang-Yin Xu, and Jianguo G. Gu. "Shear mechanical force induces an increase of intracellular Ca2+in cultured Merkel cells prepared from rat vibrissal hair follicles." Journal of Neurophysiology 106, no. 1 (2011): 460–69. http://dx.doi.org/10.1152/jn.00274.2011.

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Merkel cells have been proposed to play a role in mechanical transduction of light touch in mammals. In the present study, Merkel cells were prepared from upper segments of rat vibrissal hair follicles and maintained in culture. Reponses of these cells to shear mechanical forces were examined by Ca2+imaging technique. Shear forces of ≥0.8 dyn/cm2that were delivered to the cells by the application of normal bath solution significantly increased intracellular Ca2+levels ([Ca2+]i) in some of these cells, and up to 30% cells responded to 1.6 dyn/cm2shear force applied for 20 s. Gd3+(100 μM), a com
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37

Ma, Yong Jie, Yi Du Zhang, and Xiao Ci Zhao. "Cutting Force Model of Aluminum Alloy 2014 in Turning with ANOVA Analysis." Applied Mechanics and Materials 42 (November 2010): 242–45. http://dx.doi.org/10.4028/www.scientific.net/amm.42.242.

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In the present study, aluminum alloy 2014 was selected as workpiece material, cutting forces were measured under turning conditions. Cutting parameters, the depth of cut, feed rate, the cutting speed, were considered to arrange the test research. Mathematical model of turning force was solved through response surface methodology (RSM). The fitting of response surface model for the data was studied by analysis of variance (ANOVA). The quadratic model of RSM associated with response optimization technique and composite desirability was used to find optimum values of machining parameters with res
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38

Xu, Jiang Lin, and Zhi Sun. "Prestress Force Identification Based on Forced Vibration Tests of Eccentrically Prestressed Concrete Beam." Advanced Materials Research 479-481 (February 2012): 733–38. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.733.

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The measurement of residue prestress force is one main issue for condition and performance assessment of prestressed concrete beam bridge. This paper proposes a vibration based parameter estimation technique for this purpose. Under given form external excitation, beam velocity responses at multiple points are collected firstly. The prestress force of the beam is then identified based on the minimization of the least square difference between the measured response and the baseline response. A numerical study on a beam of variant length, subjected to a constant prestress force with variant eccen
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39

Kim. "Formula for Equivalent Impulsive Force to Predict Vibrational Response of High-frequency Staircases." Journal of Korean Society of Steel Construction 27, no. 2 (2015): 181. http://dx.doi.org/10.7781/kjoss.2015.27.2.181.

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LiZhong, Xu, and Fu XiaoRui. "Electromechanical Coupled Forced Responses for Microplate." Advances in Mechanical Engineering 6 (January 1, 2014): 857015. http://dx.doi.org/10.1155/2014/857015.

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The electromechanical coupled forced response of the microplate subjected to electrostatic force is investigated. Using electromechanical coupled dynamic equations and the mode superposition method, the forced responses of the microplate to voltage excitation and load excitation are analyzed, respectively. Based on this, the coupled forced responses of the micrplate to voltage and load excitations are obtained. Beat vibration caused by the coupled response is investigated and the condition that the beat vibration occurs is determined.
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41

Sun, Zhe, Luis A. Martinez-Lemus, Michael A. Hill, and Gerald A. Meininger. "Extracellular matrix-specific focal adhesions in vascular smooth muscle produce mechanically active adhesion sites." American Journal of Physiology-Cell Physiology 295, no. 1 (2008): C268—C278. http://dx.doi.org/10.1152/ajpcell.00516.2007.

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Integrin-mediated mechanotransduction in vascular smooth muscle cells (VSMCs) plays an important role in the physiological control of tissue blood flow and vascular resistance. To test whether force applied to specific extracellular matrix (ECM)-integrin interactions could induce myogenic-like mechanical activity at focal adhesion sites, we used atomic force microscopy (AFM) to apply controlled forces to specific ECM adhesion sites on arteriolar VSMCs. The tip of AFM probes were fused with a borosilicate bead (2∼5 μm) coated with fibronectin (FN), collagen type I (CNI), laminin (LN), or vitron
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42

Ratchev, Valeri, and Todor Tagarev. "Policy and Legal Frameworks of Using Armed Forces for Domestic Disaster Response and Relief." Information & Security: An International Journal 40, no. 2 (2018): 137–66. http://dx.doi.org/10.11610/isij.4011.

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43

Wheat, H. E., L. M. Salo, and A. W. Goodwin. "Cutaneous Afferents From the Monkeys Fingers: Responses to Tangential and Normal Forces." Journal of Neurophysiology 103, no. 2 (2010): 950–61. http://dx.doi.org/10.1152/jn.00502.2009.

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Control of tangential force plays a key role in everyday manipulations. In anesthetized monkeys, forces tangential to the skin were applied at a range of magnitudes comparable to those used in routine manipulations and in eight different directions. The paradigm used enabled separation of responses to tangential force from responses to the background normal force. For slowly adapting type I (SAI) afferents, tangential force responses ranged from excitatory through no response to suppression, with both a static and dynamic component. For fast adapting type I (FAI) afferents, responses were dyna
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44

Macpherson, J. M. "Changes in a postural strategy with inter-paw distance." Journal of Neurophysiology 71, no. 3 (1994): 931–40. http://dx.doi.org/10.1152/jn.1994.71.3.931.

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1. The purpose of this study was to examine the effect of changing initial stance conditions on the postural response of the cat to horizontal plane translations of the support surface. Cats were trained to stand, unrestrained, on a moveable force platform. The platform was translated linearly in each of 16 directions in the horizontal plane, with a ramp-and-hold displacement. The animal's response was quantified in terms of the forces exerted at the ground. The trajectory of the center of mass (CoM) was computed from the forces. 2. Stance length was varied along the longitudinal (sagittal) ax
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45

Diaz, S. E., and L. A. San Andre´s. "Air Entrainment Versus Lubricant Vaporization in Squeeze Film Dampers: An Experimental Assessment of Their Fundamental Differences." Journal of Engineering for Gas Turbines and Power 123, no. 4 (1998): 871–77. http://dx.doi.org/10.1115/1.1383258.

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Squeeze film dampers (SFDs) provide structural isolation and energy dissipation in air-breathing engines and process gas compressors. However, SFDs are prone to develop a flow regime where the ingestion of air leads to the formation of a bubbly lubricant. This pervasive phenomenon lacks proper physical understanding and sound analytical modeling, although actual practice demonstrates that it greatly reduces the damper force response. Measurements of film pressures in a test SFD describing circular centered orbits at whirl frequencies varying from 0 to 100 Hz are presented for fully flooded and
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46

Stern, Menachem, Chukwunonso Arinze, Leron Perez, Stephanie E. Palmer, and Arvind Murugan. "Supervised learning through physical changes in a mechanical system." Proceedings of the National Academy of Sciences 117, no. 26 (2020): 14843–50. http://dx.doi.org/10.1073/pnas.2000807117.

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Mechanical metamaterials are usually designed to show desired responses to prescribed forces. In some applications, the desired force–response relationship is hard to specify exactly, but examples of forces and desired responses are easily available. Here, we propose a framework for supervised learning in thin, creased sheets that learn the desired force–response behavior by physically experiencing training examples and then, crucially, respond correctly (generalize) to previously unseen test forces. During training, we fold the sheet using training forces, prompting local crease stiffnesses t
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47

Yu, H. Y., and Sanboh Lee. "Time-harmonic elastic singularities and oscillating indentation of layered solids." IMA Journal of Applied Mathematics 85, no. 4 (2020): 542–63. http://dx.doi.org/10.1093/imamat/hxaa017.

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Abstract A new approach is proposed for obtaining the dynamic elastic response of a multilayered elastic solid caused by axisymmetric, time-harmonic elastic singularities. The method for obtaining the elastodynamic Green’s functions of the point force, double forces and center of dilatation is presented. For this purpose, the boundary conditions in an infinite solid at the plane passing through the singularity are derived first by using Helmholtz potentials. Then the Green’s function solution for layered solids is obtained by solving a set of simultaneous linear algebraic equations using the b
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48

Wei, S. T., and C. Pierre. "Localization Phenomena in Mistuned Assemblies with Cyclic Symmetry Part II: Forced Vibrations." Journal of Vibration and Acoustics 110, no. 4 (1988): 439–49. http://dx.doi.org/10.1115/1.3269548.

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The effects of disorder on the forced response of nearly periodic structures with cyclic symmetry are investigated. The force model adopted here is relevant to blade assemblies. Perturbation methods for the forced response are developed to gain a physical insight into the effects of mistuning. The study shows that the internal coupling between component systems is the key parameter governing the sensitivity to mistuning and that localized forced vibrations do occur in the disordered assembly for weak internal coupling. However, although both localized free and forced vibrations occur for finit
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49

Kan, Xuanen, and Zili Xu. "Vibration localization for a rotating mistuning bladed disk with the Coriolis effect by a state-space decoupling method." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 3 (2017): 1011–20. http://dx.doi.org/10.1177/0954410017744238.

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Slight deviations of blades due to manufacturing tolerances can cause mistuning of bladed disk leading to localized vibration, which can accelerate fatigue. Moreover, the rotating blades are subjected to the Coriolis effect and the influence of the Coriolis force on the natural frequencies of high-speed rotational bladed disks such as those of an aero-engine become more apparent. In this paper, the effect of Coriolis force on the forced response localization of a mistuned bladed disk are investigated, for conditions where the natural frequency located in the first and second modal families of
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50

Pan, Chudong, and Ling Yu. "Identification of external forces via truncated response sparse decomposition under unknown initial conditions." Advances in Structural Engineering 22, no. 15 (2019): 3161–75. http://dx.doi.org/10.1177/1369433219859479.

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When structural dynamic design for smart control and health monitoring is executed, imposed excitations on structures are one of most important issues in structural engineering. Identification of structural excitations, such as force reconstruction, moving force identification, and so on, has drawn increasing attentions in the last decades. Assumption of known initial conditions is a precondition for existing deterministic force reconstruction methods. However, initial conditions are often unknown and hard to be estimated. To address this problem, a novel truncated response sparse decompositio
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