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Academic literature on the topic 'Forced responce'

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Published: 10 March 2023

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Journal articles on the topic "Forced responce"

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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 (September 3, 2020): 314–17. http://dx.doi.org/10.14745/ccdr.v46i09a05f.

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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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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 (May 20, 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 of forces, and RSM generated a dataset containing the values of amplitude, frequency, location of forces, and vibration acceleration at several points of the structure. The dataset was used for training and testing a random forest regression model for the prediction of any location, amplitude, and frequency of the force to be identified with information on only the vibration acquisition at certain points of the structure. Numerical results showed excellent accuracy in identifying the force applied to the structure.
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Ahmed, Rizwan, Christian Maria Firrone, and Stefano Zucca. "Design and Calibration of a Tri-Directional Contact Force Measurement System." Applied Sciences 11, no. 2 (January 19, 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 shroud contact forces for a comprehensive and more reliable validation of the shroud contact models. This demands an accurate and robust measurement solution that is compatible with the nature and orientation of the contact forces at blade shrouds. This study presents a cost effective and adaptable tri-directional force measurement system to measure static and dynamic contact forces simultaneously in three directions at blade shrouds during forced response tests. The system is based on three orthogonal force transducers connected to a reference block that will eventually be put in contact with the blade shroud in the test rig. A calibration process is outlined to define a decoupling matrix and its subsequent validation is demonstrated in order to evaluate the effectiveness of the measurement system to measure the actual contact forces acting on the contact.
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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 (April 1, 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 algebraic equations that can be solved to yield the forced response of the blade excited by harmonic external forces. The predicted forced response can then be used to optimize a given damper design, namely to determine the dynamic weight at which the maximum reduction of resonant response is obtained. In order to illustrate the capacity of the proposed method and to examine its accuracy, the forced response of a test beam is examined. The prediction is also compared with the results of lab tests to validate the proposed dual-interface friction force model.
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Otsuru, Yoshihide, Yuichi Kurita, Koji Kawaguchi, Minoru Hattori, Hiroyuki Egi, Hideki Ohdan, Kazuyuki Nagata, and Toshio Tsuji. "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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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 (August 15, 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 Coriolis effects in order to represent accurately all the significant factors that affect the forced response levels.
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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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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 (October 1, 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 friction joint over a cycle of motion. The harmonic balance method is then used to impose the effective stiffness and damping of the friction joint on the linear structure. The solution procedure for the nonlinear response of a two-degree-of-freedom oscillator is demonstrated. As an application, this procedure is used to study the coupling effect of two constrained forces, friction force and variable normal load, on the optimization of the shroud contact design.
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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 is increased by 1.02% compared to the system without considering the Coriolis effects as the rotating speed is 3000 rpm, while the amplitude magnification factor is increased by 2.76% as the rotating speed is 10000 rpm. The results indicate that the amplitude magnification factor may be moderately enhanced with the increasing of rotating speed. Moreover, the position of the maximum forced response of bladed disk may shift from one blade to another with the increasing of the rotational speed, when the effects of Coriolis forces are considered.
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Dissertations / Theses on the topic "Forced responce"

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Raouf, Raouf A. "Nonlinear forced response of circular cylindrical shells." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/101255.

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A combination of the Galerkin procedure and the method of multiple scales is used to analyze the nonlinear forced response of circular cylindrical shells in the presence of internal (autoparametric) resonances. If ωf and af denote the frequency and amplitude of a flexural mode and ωb and ab denote the frequency and amplitude of the breathing mode, the steady-state response exhibits a saturation phenomenon when ωb ≈ 2wf if the shell is excited by a harmonic load having a frequency Ω near ωb. As the amplitude f of the excitation increases from zero, ab increases linearly whereas af remains zero until a threshold is reached. This threshold is a function of the damping coefficients and ωb -2wf. Beyond this threshold, ab remains constant (i.e., the breathing mode saturates) and the extra energy spills over into the flexural mode. In other words, although the breathing mode is directly excited by the load, it absorbs a small amount of the input energy (responds with a small amplitude) and passes the rest of the input energy into the flexural mode (responds with a large amplitude).
M.S.
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Metelues, Francis Gabriel. "The Knee Response during Squats with Heels Up and Down." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1388574269.

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Seybert, Jacob. "A New Item Response Theory Model for Estimating Person Ability and Item Parameters for Multidimensional Rank Order Responses." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4942.

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The assessment of noncognitive constructs poses a number of challenges that set it apart from traditional cognitive ability measurement. Of particular concern is the influence of response biases and response styles that can influence the accuracy of scale scores. One strategy to address these concerns is to use alternative item presentation formats (such as multidimensional forced choice (MFC) pairs, triads, and tetrads) that may provide resistance to such biases. A variety of strategies for constructing and scoring these forced choice measured have been proposed, though they often require large sample sizes, are limited in the way that statements can vary in location, and (in some cases) require a separate precalibration phase prior to the scoring of forced-choice responses. This dissertation introduces new item response theory models for estimating item and person parameters from rank-order responses indicating preferences among two or more alternatives representing, for example, different personality dimensions. Parameters for this new model, called the Hyperbolic Cosine Model for Rank order responses (HCM-RANK), can be estimated using Markov chain Monte Carlo (MCMC) methods that allow for the simultaneous evaluation of item properties and person scores. The efficacy of the MCMC parameter estimation procedures for these new models was examined via three studies. Study 1 was a Monte Carlo simulation examining the efficacy of parameter recovery across levels of sample size, dimensionality, and approaches to item calibration and scoring. It was found that estimation accuracy improves with sample size, and trait scores and location parameters can be estimated reasonably well in small samples. Study 2 was a simulation examining the robustness of trait estimation to error introduced by substituting subject matter expert (SME) estimates of statement location for MCMC item parameter estimates and true item parameters. Only small decreases in accuracy relative to the true parameters were observed, suggesting that using SME ratings of statement location for scoring might be a viable short-term way of expediting MFC test deployment in field settings. Study 3 was included primarily to illustrate the use of the newly developed IRT models and estimation methods with real data. An empirical investigation comparing validities of personality measures using different item formats yielded mixed results and raised questions about multidimensional test construction practices that will be explored in future research. The presentation concludes with a discussion of MFC methods and potential applications in educational and workforce contexts.
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Lauer, Ira Edwin. "Studies of wood pallet response to forced vibration." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-12232009-020354/.

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Hultman, Hugo. "Validation of Forced Response Methods for Turbine Blades." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172144.

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Moffatt, Stuart. "Forced response prediction for industrial gas turbine blades." Thesis, Durham University, 2006. http://etheses.dur.ac.uk/2692/.

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A highly efficient aeromechanical forced response system is developed for predicting resonant forced vibration of turbomachinery blades with the capabilities of fully 3-D non-linear unsteady aerodynamics, 3-D finite element modal analysis and blade root friction modelling. The complete analysis is performed in the frequency domain using the non linear harmonic method, giving reliable predictions in a fast turnaround time. A robust CFD-FE mesh interface has been produced to cope with differences in mesh geometries, and high mode shape gradients. A new energy method is presented, offering an alternative to the modal equation, providing forced response solutions using arbitrary mode shape scales. The system is demonstrated with detailed a study of the NASA Rotor 67 aero engine fan rotor. Validation of the forced response system is carried out by comparing predicted resonant responses with test data for a 3-stage transonic Siemens industrial compressor. Two fully-coupled forced response methods were developed to simultaneously solve the flow and structural equations within the fluid solver. A novel closed-loop resonance tracking scheme was implemented to overcome the resonant frequency shift in the coupled solutions caused by an added mass effect. An investigation into flow-structure coupling effects shows that the decoupled method can accurately predict resonant vibration with a single solution at the blade natural frequency. Blade root-slot friction damping is predicted using a modal frequency-domain approach by applying linearised contact properties to a finite element model, deriving contact Droperties from an advanced semi-analytical microslip model. An assessment of Coulomb and microslip approaches shows that only the microslip model is suitable for predicting root friction damping.
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Smythe, Caitlin J. (Caitlin Jeanne). "Forced response predictions in modern centrifugal compressor design." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32454.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2005.
Includes bibliographical references (p. 119-120).
A computational interrogation of the time-averaged and time-unsteady flow fields of two centrifugal compressors of nearly identical design (the enhanced, which encountered aeromechanical difficulty, and production, which did not encounter any such difficulty) is undertaken in an effort to establish a causal link between impeller-diffuser interactions and the forced response behavior of the impeller blades. Through comparison of time- averaged flow variable and performance estimates with test rig data, the three- dimensional, unsteady, Reynolds-averaged Navier-Stokes flow solver (MSU Turbo) used in this interrogation is found to be adequate to the task of distinguishing the flow fields of the two centrifugal compressor designs. Thus, it is found that MSU Turbo can be a useful tool in comparing the unsteady flow fields in different centrifugal compressors. In addition, through comparisons of MSU Turbo/ ANSYS® estimates of strain with measured peak strain, MSU Turbo is also found to have the potential, as part of a CFD/ ANSYS® system, for serving as a predictive tool for forced response behavior in centrifugal compressors. Differences are found in the unsteady flow fields of the two compressors. The fluctuations over time of the unsteady blade loading on the enhanced impeller blades are greater than those on the production impeller blades. In the vaneless space, on each annular plane (from the impeller exit to the diffuser inlet), at a given spanwise location, the enhanced compressor has both a greater spatial variation in pressure and a higher average static pressure than the production compressor. At the diffuser inlet, there are differences in the time-averaged incidence angle distributions of the two compressors.
(cont.) Based on the observations delineated above, it is hypothesized that the differences in the time-averaged incidence angle distributions are the source of the differences in the pressure field that propagates upstream into the impeller passage, where these differences affect the unsteady blade loading. The differences in the unsteady blade loading then lead to the observed forced response behavior in the two designs.
by Caitlin J. Smythe.
S.M.
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Holzinger, Felix. "Development of a Concept for Forced Response Investigations." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/46074.

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Striving to improve performance and lower weight of aircraft engines, modern compressor blades become thinner and lighter but higher loaded resulting in an increased vulnerability towards flutter. This trend is further aggravated through blisk designs that diminish structural damping and therewith flutter margin. Modern 3D wide-chord blade designs result in complex structural behaviors that add to the difficulty of correctly predicting flutter occurrence. To counteract above tendencies by driving the physical understanding of flutter and thereby helping to improve aero engine design tools, free flutter as well as forced response will be investigated in the 1.5 stage transonic compressor at TU Darmstadt. Aim of the forced response campaign is to determine the system damping in the stable compressor regime. Hence a novel excitation system capable of dynamically exciting specific rotor blade modes is needed. It is aim of the present work to find a promising concept for such a system. In the present work, the requirements for an excitation system to be used in the TUD compressor are defined with respect to achievable frequency, phase controllability, transferred excitation level, mechanical robustness, integrability and cleanliness. Different excitation system concepts, i.e. oscillating VIGVs, rotating airfoils, tangential and axial air injection are investigated numerically. An evaluation of the results obtained through 2D numerical studies proposes axial air injection as the most favorable concept.
Master of Science
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Rattray, Andrew. "Platelet response to haemodynamic shear forces." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367819.

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Wouters, Emiel Frans Maria. "Bronchial response in COPD measured by forced oscillation technique." Maastricht : Maastricht : Rijksuniversiteit Limburg ; University Library, Maastricht University [Host], 1987. http://arno.unimaas.nl/show.cgi?fid=5376.

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Books on the topic "Forced responce"

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D, Hunt, Gawthorpe R. L, and Geological Society of London, eds. Sedimentary responses to forced regressions. London: Geological Society, 2000.

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Broyles, Janell. Chemical Biological Incident Response Force. New York, NY: Rosen, 2009.

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Use of force: Expert guidance for decisive force response. 2nd ed. Flushing, NY: Looseleaf Law Publications, Inc., 2013.

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1960-, Murthy Durbha V., and United States. National Aeronautics and Space Administration., eds. Turbomachinery Forced Response Prediction System (FREPS): User's manual. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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V, Murthy D., and United States. National Aeronautics and Space Administration., eds. Turbomachinery Forced Response Prediction System (FREPS): User's manual. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Karl, Owen A., United States. National Aeronautics and Space Administration., and U.S. Army Research Laboratory., eds. Forced response testing of an axi-centrifugal turboshaft engine. [Washington, DC]: National Aeronautics and Space Administration, U.S. Army Research Laboratory, 1997.

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United States. National Aeronautics and Space Administration., ed. Blade row interaction effects on flutter and forced response. [Washington, DC]: National Aeronautics and Space Administration, 1993.

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Karl, Owen A., and United States. National Aeronautics and Space Administration., eds. Forced response testing of an axi-centrifugal turboshaft engine. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Pfeifer, Katrin, and Niki Pfeifer, eds. Forces of Nature and Cultural Responses. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5000-5.

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Bozorgmehr, Kayvan, Bayard Roberts, Oliver Razum, and Louise Biddle, eds. Health Policy and Systems Responses to Forced Migration. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-33812-1.

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Book chapters on the topic "Forced responce"

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Watkins, William H. "Low-Frequency Response." In Loudspeaker Physics and Forced Vibration, 57–59. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91634-3_9.

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Anastasopoulou, Marilena. "Echoes of memories of forced displacement." In Europe and the Refugee Response, 12–24. New York : Routledge, 2020. |Series: Routledge studies in development, displacement and resettlement: Routledge, 2020. http://dx.doi.org/10.4324/9780429279317-2.

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Hynes, Patricia. "Understanding legislative and policy responses and ethical imperatives." In Introducing Forced Migration, 174–96. 1 Edition. | New York : Routledge, 2021. | Series: Rethinking development: Routledge, 2021. http://dx.doi.org/10.4324/9781315165929-7.

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Brown, Anna, and Albert Maydeu-Olivares. "Modelling Forced-Choice Response Formats." In The Wiley Handbook of Psychometric Testing, 523–69. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781118489772.ch18.

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Nowinski, M. C., and P. Ott. "A Basic Forced Response Experiment." In Unsteady Aerodynamics and Aeroelasticity of Turbomachines, 665–78. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5040-8_43.

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Hyderkhan, Scott. "Rescue Task Force (RTF) Operations." In Active Shooter Response Training, 47–60. Second edition. | New York, NY: Routledge, 2020. |: Routledge, 2020. http://dx.doi.org/10.4324/9780429282188-4.

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Watkins, William H. "Efficiency and the Mechanical Response Function." In Loudspeaker Physics and Forced Vibration, 27–35. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91634-3_5.

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Gangopadhyay, Avijit. "Responses and Forces." In Introduction to Ocean Circulation and Modeling, 27–50. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9780429347221-2.

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Shabana, A. A. "Response to Nonharmonic Forces." In Mechanical Engineering Series, 185–236. New York, NY: Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4612-3976-5_5.

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Shabana, A. A. "Response to Nonharmonic Forces." In Mechanical Engineering Series, 177–224. New York, NY: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-0362-6_5.

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Conference papers on the topic "Forced responce"

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Giacomelli, Enzo, Marco Passeri, Matteo Romiti, and Stefano Generosi. "Forced Responce of Cylinder Manifold for Reciprocating Compressor Applications." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95504.

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The system consisting of the reciprocating compressor and associated bottles, known as the “Cylinder manifold” may potentially be the source and location of high vibration problems. Consequently special attention must be paid to the complete simulation of the system to assure smooth and safe operation. Applicable standards specify the items to be included in the study (crosshead guides, distance pieces, cylinder flanges, joints, supports, etc.). However only a model built using manufacturing drawings and validated by site measurements can provide a sufficient accurate description of the characteristics of these critical components and therefore realistic results. Knowledge of the frequencies and amplitudes of pulsation induced shaking forces defined by acoustical simulation, internal gas forces in the cylinder, and unbalanced mechanical forces and moments allows a proper forced response analysis of the cylinder manifold system to be performed. These forces are applied to the finite element model to calculate the relevant vibrations and stress amplitudes by performing a harmonic analysis. When the dynamic stresses are out of the limits it is necessary to go back to the cylinder manifold system analysis or to the acoustical study to find a solution using different supports, with lower shaking forces, or by modifying the volume bottle design. This enables an iterative analysis of the system until all requirements have been satisfied. Additional results of a forced response analysis are the reaction forces on the cylinder and discharge volume bottle supports. When the application requires a large and heavy acoustic damping system with consequently a low mechanical natural frequency, or the compressor speed is significantly high, the possibility of mechanical resonance in the first design is very high. Therefore the execution of these studies at a very early stage of the project is fundamental. The proper solution can be found only by close cooperation between the compressor manufacturer, end user, engineering contractor and vibration specialist.
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Vahdati, M., C. Breard, G. Simpson, and M. Imregun. "Forced Response Assessment Using Modal Force Based Indicator Functions." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50306.

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This paper will focus on core-compressor forced response with the aim to develop two design criteria, the so-called chordwise cumulative modal force and heightwise cumulative force, to assess the potential severity of the vibration levels from the correlation between the unsteady pressure distribution on the blade’s surface and the structural modeshape. It is also possible to rank various blade designs since the proposed criterion is sensitive to changes in both unsteady aerodynamic loads and the vibration modeshapes. The proposed methodology was applied to a typical core-compressor forced response case for which measured data were available. The Reynolds-averaged Navier-Stokes equations were used to represent the flow in a non-linear time-accurate fashion on unstructured meshes of mixed elements. The structural model was based on a standard finite element representation from which the vibration modes were extracted. The blade flexibility was included in the model by coupling the finite element model to the unsteady flow model in a time-accurate fashion. A series of numerical experiments were conducted by altering the stator wake and using the proposed indicator functions to minimize the rotor response levels. It was shown that a fourfold response reduction was possible for a certain mode with only a minor modification of the blade.
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Martel, Carlos, and Juan A. Martín. "Asymptotic Description of Forced Response Vibration Saturation by Friction Forces." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90765.

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Abstract The estimation of the final vibration amplitude of a turbomachinery bladed disk is of extreme practical importance; it is an essential information for the prediction of the level of high cycle fatigue of the blades, and for the subsequent estimation of its operative life span. The forced response vibration is saturated by the nonlinear damping introduced by the friction forces at the interfaces between blade and disk (and/or at the included dampers). The computation of the final amplitude of the limit cycle oscillation requires to solve a quite complicated nonlinear problem. In the case of a tuned bladed disk, this problem can be reduced to a single sector calculation with phase lag boundary conditions. The solution of this one-sector problem requires to consider many harmonics in order to capture the details of the nonlinear time periodic oscillation that sets in. If the small unavoidable differences among blades (mistuning) are also taken into account, then the situation becomes even more complicated because the solution of the mistuned vibration problem requires to consider not only a single sector but the complete bladed disk. The possibility of applying multiple scales techniques to drastically simplify this problem is explored in this paper. The idea is to exploit the fact that all relevant effects present (forcing, nonlinear friction, and mistuning) are, in most practical situations, small effects that develop in a time scale that is much longer than that associated with the natural elastic vibration frequency of the tuned system. A mass-spring model with microslip nonlinear friction is used to represent the forced bladed disk. The multiple scales method is used to asymptotically derive simplified models for both tuned and mistuned configurations. The results of the asymptotic model are compared with those from the mass-spring system, and used to analyze the particular characteristics of the nonlinear friction effects on the final vibration states.
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Nikolic, M., E. P. Petrov, and D. J. Ewins. "Coriolis Forces in Forced Response Analysis of Mistuned Bladed Discs." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90315.

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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 discs 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 disc. The primary objective of the study reported in this paper is to establish whether current mistuned bladed disc analyses should incorporate Coriolis effects in order to represent accurately all the significant factors that affect the forced response levels.
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Gu, Weiwei, Zili Xu, and Lv Qiang. "Forced Response of Shrouded Blades With Intermittent Dry Friction Force." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51041.

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The gap friction damper model is presented in this paper, which is employed to simulate the friction forces at the contact points of the shroud interface. Using the harmonic balance method (HBM), the friction force can be approximated by a series of harmonic functions. The governing differential equations of blade motion are transformed into a set of nonlinear algebraic equations, which can be solved iteratively to yield the steady-state response. The results show that the forced response is attenuated due to the additional damping introduced by frictional slip. The predicted results agree well with those of the Runge-Kutta method. In addition, the effect of parameters of damping structures such as the gap size, friction coefficient and normal load on the forced response of blades were studied. The results show that increasing the damper gap size causes a increase in resonant response. However, the increment isn’t obvious. In addition, an increase in friction coefficient or normal load decreases the forced response of blade.
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Ahmed, Rizwan, Christian Maria Firrone, and Stefano Zucca. "Experimental Investigation of Three-Dimensional Shroud Contact Forces in Forced-Vibration Testing of a Shrouded Blade." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-84205.

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Abstract Low Pressure Turbine (LPT) blades encounter highly stressed forced vibrations driven by centrifugal force and steady/unsteady aerodynamic loads. To prevent the blades from failure due to high cycle fatigue (HCF), the amplitude of these vibrations must be estimated and reduced. Friction damping devices like under-platform dampers, shrouds and snubbers are usually implemented to lessen these blade vibration amplitudes. For adjacent shrouded blades coupled to each other at the blade tips, the blade vibration levels are strongly affected by the three-dimensional periodic contact forces at shrouds resulting in energy dissipation due to friction. Therefore, to experimentally validate the numerical contact models that predict nonlinear forced response of shrouded blades, it is equally important to measure the contact forces acting at the shrouds. This study outlines the development and commissioning of an experimental test rig that allows the measurement of three-dimensional shroud contact forces and the forced response of the shrouded blade simultaneously. Firstly, the design requirements of the experimental setup that were considered while deciding the test rig components, are highlighted. The test rig comprises of a pair of tri-directional contact force transducers in contact with the two shroud ends of a dummy blade and includes a blade twisting mechanism for the application of the normal preload. The employed tri-directional contact force transducers consist of three uniaxial strain gauge-based force sensors, arranged in a tripod configuration, and attached to a reference block that accommodates the shroud. The calibration and the decoupling procedure of the tri-directional contact force measurement system is then briefly described. This is followed by the details of the experimental process to acquire the forced response and three-dimensional shroud contact forces simultaneously for a specified frequency range determined by a prior experimental modal analysis of the blade and test rig. Subsequently, the effects of the variation in shroud normal preload and excitation force on measured response and shroud contact forces are also discussed. Finally, the results demonstrate how the proposed experimental test rig provides a thorough understanding of the dynamic response of the shrouded blade and shroud contact forces which will lead to a more reliable experimental validation of simulation tools and its effect on system dynamics.
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Husser, Nicholas, Carolyn Judge, and Stefano Brizzolara. "Validation of Forced Heave Simulations on a Planing Hull." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62298.

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Abstract Advances in nonlinear modeling techniques have created opportunities for more robust modeling of planing hull dynamics than previous techniques relying on linear assumptions. These techniques rely on the imposition of complex, coupled forced motions on a hull. RANSE CFD provides a distinct advantage over experimentation when imposing complicated forced motions because mechanical limitations of the forced motion mechanism and uncertainty in the prescribed motion are eliminated, though the accuracy of the simulations needs to be validated. In this work, a series of sinusoidal forced heave experiments on a planing craft are used to validate the force response predicted by simulation for the same forced motion. The accuracy of the predicted force response is evaluated relative to the experiments with the experimental setup uncertainty considered. Within the experimental setup uncertainty, the force response is predicted well by RANSE CFD and is found to be reasonably accurate. The dynamic trim angle is found to have a major impact on the dynamic force response with variations on the order of half a degree having substantial impacts on the measured forces.
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Vasanthakumar, Parthasarathy, and Paul-Benjamin Ebel. "Forced Response Analysis of a Transonic Fan." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69867.

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The forced response of turbomachinery blades is a primary source of high cycle fatigue (HCF) failure. This paper deals with the computational prediction of blade forced response of a transonic fan stage that consists of a highly loaded rotor along with a tandem stator. In the case of a transonic fan, the forced response of the rotor due to the downstream stator assumes significance because of the transonic flow field. The objective of the present work is to determine the forced response of the rotor induced as a result of the unsteady flow field due to the downstream stator vanes. Three dimensional, Navier-Stokes flow solver TRACE is used to numerically analyse the forced response of the fan. A total of 11 resonant crossings as identified in the Campbell diagram are examined and the corresponding modeshapes are obtained from finite element modal analysis. The interaction between fluid and structure is dealt with in a loosely coupled manner based on the assumption of linear aerodynamic damping. The aerodynamic forcing is obtained by a nonlinear unsteady Navier-Stokes computation and the aerodynamic damping is obtained by a time-linearized Navier-Stokes computation. The forced response solution is obtained by the energy method allowing calculations to be performed directly in physical space. Using the modal forcing and damping, the forced response amplitude can be directly computed at the resonance crossings. For forced response solution, the equilibrium amplitude is reached when the work done on the blade by the external forcing function is equal to the work done by the system damping (aerodynamic and structural) force. A comprehensive analysis of unsteady aerodynamic forces on the rotor blade surface as a result of forced response of a highly loaded transonic fan is carried out. In addition, the correspondence between the location of high stress zones identified from the finite element analysis and the regions of high modal force identified from the CFD analysis is also discussed.
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Zhang, She-min, Nobuyoshi Morita, and Takao Torii. "Reduction of Forced Vibration Response by Optimum Balance of Linkage and Optimum Design of System." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4212.

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Abstract This paper proposes a new method to reduce the forced vibration response of frame of linkage. It is that the root-mean-square (RMS) value of binary maximum (Bmax) of forced vibration response at a series of angular velocities is taken as the objective function, and the counterweight mass parameters of links and the stiffness factors are used as design variables. Then, it is found out that the responses are related not only to the Bmax value of shaking forces, but also to the shape of curve of shaking forces. The calculation results are compared with those of two other methods used in the reduction of forced vibration response by optimized balance of linkages, and it is shown that the new method can significantly reduce the responses of frame of linkage.
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Yang, Jingyuan, and Weiwei Zhang. "Forced response analysis of the rotor blade rows with the ROM-based aeroelastic model." In GPPS Xi'an21. GPPS, 2022. http://dx.doi.org/10.33737/gpps21-tc-25.

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A rapid method, based on the reduced order model (ROM), is developed to analyze the forced response of the rotor due to the rotor-stator interaction. The unsteady aerodynamic force acting on blades is divided into two parts according to the source. One part is due to the rotor-stator interaction, while the other is due to the blade vibration. The aerodynamic forces due to the rotor-stator interaction is regarded as excitation, while an unsteady aerodynamic force model is built to calculate the unsteady aerodynamic force by the blade vibration. Then an aeroelastic model is built via coupling the structural equation with the unsteady aerodynamic force model. The aeroelastic model is calculated with the excitation of the aerodynamic forces due to the rotor-stator interaction. The forced response for the 50% height of the NASA67 secondstage rotor is analyzed by the CFD/CSD method, the ROM method and the energy method via time domain method respectively. Compared with the energy method, the relative error of the resonant amplitude is fallen from 12.5% to 0.06% by ROM method, while the efficiency is improved by 46.36 times as compared with the CFD/CSD method. In order to discuss the influence of structural parameters, the forced response analysis is conducted by the ROM method with various mass ratios and structural frequencies. It illustrates that the effect of fluid-structure coupling is crucial to the low-massratio structure. Furthermore, the structural frequency is not exactly coincident with the excitation frequency when the response amplitude reaches its peak.
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Reports on the topic "Forced responce"

1

Murphy, III, and George J. International Quick Response Forces. Fort Belvoir, VA: Defense Technical Information Center, June 1994. http://dx.doi.org/10.21236/ada282113.

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Byrd, David F., and Jr. Quality Air Force in an Emergency. Leadership Principles and Concepts for Emergency Response Forces,. Fort Belvoir, VA: Defense Technical Information Center, August 1996. http://dx.doi.org/10.21236/ada328420.

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Algermissen, Robert M. Humanitarian Assistance Response Ready Forces. Fort Belvoir, VA: Defense Technical Information Center, May 1995. http://dx.doi.org/10.21236/ada300264.

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Kaawa-Mafigiri, David, Megan Schmidt-Sane, and Tabitha Hrynick. Key Considerations for RCCE in the 2022 Ebola Outbreak Response in Greater Kampala, Uganda. Institute of Development Studies, November 2022. http://dx.doi.org/10.19088/sshap.2022.037.

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On 20 September 2022, an outbreak of the Sudan strain of Ebola Virus Disease – SVD – was announced as the first laboratory-confirmed patient was identified in a village in Mubende District in central Uganda. Uganda’s Ministry of Health (MoH) activated the National Task Force and developed and deployed a National Response Plan, which includes the activation of District Task Forces. The target areas include the epicentre (Mubende and Kassanda districts) and surrounding areas, as well as Masaka, Jinja and Kampala cities. This is of great concern, as Kampala is the capital city with a high population and linkages to neighbouring districts and international locations (via Entebbe Airport). It is also a serious matter given that there has been no outbreak of Ebola before in the city. This brief details how Risk Communication and Community Engagement (RCCE) activities and approaches can be adapted to reach people living in Greater Kampala to increase adoption of preventive behaviours and practices, early recognition of symptoms, care seeking and case reporting. The intended audiences include the National Task Force and District Task Forces in Kampala, Mukono, and Wakiso Districts, and other city-level RCCE practitioners and responders. The insights in this brief were collected from emergent on-the-ground observations from the current outbreak by embedded researchers, consultations with stakeholders, and a rapid review of relevant published and grey literature. This brief, requested by UNICEF Uganda, draws from the authors’ experience conducting social science research on Ebola preparedness and response in Uganda. It was written by David Kaawa-Mafigiri (Makerere University), Megan Schmidt-Sane (Institute of Development Studies (IDS)), and Tabitha Hrynick (IDS), with contributions from the MoH, UNICEF, the Center for Health, Human Rights and Development (CEHURD), the Uganda Harm Reduction Network (UHRN), Population Council and CLEAR Global/Translators without Borders. It includes some material from a SSHAP brief developed by Anthrologica and the London School of Economics. It was reviewed by the Uganda MoH, University of Waterloo, Anthrologica, IDS and the RCCE Collective Service. This brief is the responsibility of SSHAP.
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Gault, Paul T. Enhancing Domestic Response: The Implementation of the Homeland Response Force. Fort Belvoir, VA: Defense Technical Information Center, March 2011. http://dx.doi.org/10.21236/ada547309.

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Haulman, Daniel L. The US Air Force Response to Hurricane Katrina. Fort Belvoir, VA: Defense Technical Information Center, November 2006. http://dx.doi.org/10.21236/ada517164.

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Harman III, Frank L. Decisive Military Force in Response to Transnational Threats. Fort Belvoir, VA: Defense Technical Information Center, March 2001. http://dx.doi.org/10.21236/ada393124.

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Trapani, Paola. Collaborative Housing as a Response to the Housing Crisis in Auckland. Unitec ePress, July 2018. http://dx.doi.org/10.34074/ocds.0821.

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According to future projections based on current demographic growth trends, Auckland’s population will reach two million in 2033. Since the city is already afflicted by a serious housing crisis, at the beginning of 2017 the newly elected Mayor Phil Goff set up a task force. Formed by representatives of various stakeholders, it was given the task of producing a report with strategic and tactical guidelines to mitigate the situation. Unitec researchers were invited to respond to the report, which came out at the end of 2017, in the form of three think pieces towards the Building Better Homes, Towns and Cities National Science Challenge. This paper is a new iteration of one of these think pieces, focused on collaborative living, and expands on the new role that designers should play in this field. Its ideological position is that the house cannot and should not be considered as a commodity on the free market; nor should focus solely be on bringing down prices by increasing the number of houses on offer. Over time, housing might evolve to being more about social (use) value than exchange value. Other models of the production and consumption of household goods are documented throughout the world as alternatives to mainstream market logic, using collective procurement mechanisms to cut construction and marketing costs with savings of up to 30%. These experiments, not limited to achieving financially sustainable outcomes, are linked to new social practices of collaboration between neighbours. The sharing of spaces and equipment to complement private housing units also leads to social and environmental sustainability.
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Gunay, Selim, Fan Hu, Khalid Mosalam, Arpit Nema, Jose Restrepo, Adam Zsarnoczay, and Jack Baker. Blind Prediction of Shaking Table Tests of a New Bridge Bent Design. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, November 2020. http://dx.doi.org/10.55461/svks9397.

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Considering the importance of the transportation network and bridge structures, the associated seismic design philosophy is shifting from the basic collapse prevention objective to maintaining functionality on the community scale in the aftermath of moderate to strong earthquakes (i.e., resiliency). In addition to performance, the associated construction philosophy is also being modernized, with the utilization of accelerated bridge construction (ABC) techniques to reduce impacts of construction work on traffic, society, economy, and on-site safety during construction. Recent years have seen several developments towards the design of low-damage bridges and ABC. According to the results of conducted tests, these systems have significant potential to achieve the intended community resiliency objectives. Taking advantage of such potential in the standard design and analysis processes requires proper modeling that adequately characterizes the behavior and response of these bridge systems. To evaluate the current practices and abilities of the structural engineering community to model this type of resiliency-oriented bridges, the Pacific Earthquake Engineering Research Center (PEER) organized a blind prediction contest of a two-column bridge bent consisting of columns with enhanced response characteristics achieved by a well-balanced contribution of self-centering, rocking, and energy dissipation. The parameters of this blind prediction competition are described in this report, and the predictions submitted by different teams are analyzed. In general, forces are predicted better than displacements. The post-tension bar forces and residual displacements are predicted with the best and least accuracy, respectively. Some of the predicted quantities are observed to have coefficient of variation (COV) values larger than 50%; however, in general, the scatter in the predictions amongst different teams is not significantly large. Applied ground motions (GM) in shaking table tests consisted of a series of naturally recorded earthquake acceleration signals, where GM1 is found to be the largest contributor to the displacement error for most of the teams, and GM7 is the largest contributor to the force (hence, the acceleration) error. The large contribution of GM1 to the displacement error is due to the elastic response in GM1 and the errors stemming from the incorrect estimation of the period and damping ratio. The contribution of GM7 to the force error is due to the errors in the estimation of the base-shear capacity. Several teams were able to predict forces and accelerations with only moderate bias. Displacements, however, were systematically underestimated by almost every team. This suggests that there is a general problem either in the assumptions made or the models used to simulate the response of this type of bridge bent with enhanced response characteristics. Predictions of the best-performing teams were consistently and substantially better than average in all response quantities. The engineering community would benefit from learning details of the approach of the best teams and the factors that caused the models of other teams to fail to produce similarly good results. Blind prediction contests provide: (1) very useful information regarding areas where current numerical models might be improved; and (2) quantitative data regarding the uncertainty of analytical models for use in performance-based earthquake engineering evaluations. Such blind prediction contests should be encouraged for other experimental research activities and are planned to be conducted annually by PEER.
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MAR INC ROCKVILLE MD. National Strike Force (NSF) Oil Spill Response Equipment Upgrade. Fort Belvoir, VA: Defense Technical Information Center, October 1991. http://dx.doi.org/10.21236/ada242434.

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