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Relevant bibliographies by topics / Modal dynamic analysis

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Academic literature on the topic 'Modal dynamic analysis'

Author: Grafiati

Published: 3 June 2025

Last updated: 13 July 2025

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Journal articles on the topic "Modal dynamic analysis"

1

Janchikoski, Aline Ribeiro, and José Filipe Bizarro Meireles. "Dynamic analysis of a free vibrating cantilever beam." Núcleo do Conhecimento 01, no. 06 (2023): 123–42. https://doi.org/10.32749/nucleodoconhecimento.com.br/engineering-mechanical-engineering/dynamic-analysis.

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This paper has as subject a theoretical, numerical and experimental study of the behavior of a 1.5 meters long and cross section of 0.02 meters wide and high beam. The main objective was to analyze a structure, in this case it was a cantilever steel beam, to establish the possible solutions that best define the behavior of this structure, to obtain the results and to prove the veracity of the results obtained by means of an experimental analysis method. In this sense, essential theoretical foundations were used for the understanding and realization of the mathematical formulations of this project, in order to obtain the analytical results of the vibration modes of the beam and respective natural frequencies. To complement the analysis of the beam behavior, the finite element method procedure was applied using the ansys software to obtain more accurate results. The results obtained for the beam from these two methodologies include bending modes among the first 10 degrees of freedom. To validate the study done previously a physical model of the beam was used for the experimental test, for this it was defined that the equipment for measuring the resonance frequencies would be a digital stroboscope, enabling the measurement of only 8 vibration modes due to its small frequency range.

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Ciurezu-Gherghe, Leonard Marius, Nicolae Dumitru, Ionuţ Daniel Geonea, and Cristian Copiluși. "Dynamic and Modal Analysis of a Snake like Robot." Applied Mechanics and Materials 896 (February 2020): 203–10. http://dx.doi.org/10.4028/www.scientific.net/amm.896.203.

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In this paper a modal and dynamic analysis of a snake like robot is performed. Modal analysis consist in determination of own vibration modes and natural frequencies. The proposed dynamic analysis was performed in order to determine the variation time/frequency laws for the cinematic and dynamics parameters.

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An, Li Qiang, Fan Peng Kong, and Yong Fang Wang. "Dynamic Characteristics Analysis for Seismic Vibrator." Applied Mechanics and Materials 472 (January 2014): 48–55. http://dx.doi.org/10.4028/www.scientific.net/amm.472.48.

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Seismic vibrator is one of the most widely used equipments in exploration field. In recent years, with the development of exploration field, as well as the growing needs of high quality seismic data, the seismic vibrator's tonnage has increased a lot, which makes the stress of the vehicle frame very complicated in working state. And some local structure of the vehicle frame often appears crack phenomenon in working state. Therefore, the dynamic characteristic analysis is essential to the Seismic vibrator. In this paper, the finite element model of vehicle frame is established by ANSYS software. Through the modal analysis, the natural frequencies are obtained, and each vibration modes are analyzed. On the basis of the modal analysis, the modal neutral file of the vehicle frame is established. Using the data transfer function between ANSYS and ADAMS, the rigid-flexible coupling multi-body model is built for the dynamics simulation of the seismic vibrator. In this model, the stiffness and damping of air springs, hydraulic oil and soil are simulated by the spring-damper in the ADAMS software. The dynamic characteristics of vehicle frame under excited forces with different amplitude are obtained and analyzed. The stresses for some of the hot spots of the vehicle frame are extracted, which can be used to analyze the dynamic failure of the vehicle frame.

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Ghorbel, A., M. Abdennadher, B. Zghal, L. Walha, and M. Haddar. "Modal Analysis and Dynamic Behavior for Analytical Drivetrain Model." Journal of Mechanics 34, no. 4 (2017): 399–415. http://dx.doi.org/10.1017/jmech.2017.23.

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AbstractA generalized dynamic model for an automotive drive train system was detailed to investigate its modal properties and dynamic behavior. The model's engine excitation, clutch, gearbox and disc brake were presented. Then, vibration modes were obtained and classified into clutch, transmission system, disc brake, bearing and combined modes. For each vibration mode, the kinetic and strain modal energies distributions were studied. The dynamic equations were resolved using the numerical Newmark method. The dynamic behavior of the bearings and transmission errors for the two gear stages were studied, and, the effect of the disc brake parameters on the transmission error was analyzed. Finally, a frequency sweep analysis was studied to investigate the system resonance problem.

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Fergusson, N. J., and W. D. Pilkey. "Finite Dynamic Elements and Modal Analysis." Shock and Vibration 1, no. 2 (1993): 171–76. http://dx.doi.org/10.1155/1993/975327.

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A general modal analysis scheme is derived for forced response that makes use of high accuracy modes computed by the dynamic element method. The new procedure differs from the usual modal analysis in that the modes are obtained from a power series expansion for the dynamic stiffness matrix that includes an extra dynamic correction term in addition to the static stiffness matrix and the consistent mass matrix based on static displacement. A cantilevered beam example is used to demonstrate the relative accuracies of the dynamic element and the traditional finite element methods.

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Rosenthal, David, and James Trolinger. "Dynamic holographic modal analysis for NDT." Optics and Lasers in Engineering 24, no. 2-3 (1996): 129–44. http://dx.doi.org/10.1016/0143-8166(95)00024-0.

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Mofid, Massood, Panam Zarfam, and Babak Raiesi Fard. "On the modal incremental dynamic analysis." Structural Design of Tall and Special Buildings 14, no. 4 (2005): 315–29. http://dx.doi.org/10.1002/tal.271.

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Zeng, Wen, Hong Mei Xia, Yu Xing Wang, and Liu Yi Wang. "Dynamic Characteristic Analysis of Inertial Navigation Platform' Structure." Advanced Materials Research 479-481 (February 2012): 1560–64. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.1560.

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The three-dimensional solid model and finite element model of an inertial navigation platform, is established by using ANSYS software. A modal analysis has been carried out. The former 6 ordered nature frequency and modal shape have been obtained and kept away from the frequency of Laser Gyro. The finite element model of the system vibration is established and is analysed for harmonic response. The calculation data show that vibration amplitude is very small and has no influence for the Laser Gyro working. The theory modal data is the same as the modal test results, so it manifests the accuracy and effectiveness in the modeling and analysis.

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Nicoletti, Vanni, Riccardo Martini, Lorenzo Amico, Sandro Carbonari, and Fabrizio Gara. "Operational modal analysis for supporting the retrofit design of bridges." ce/papers 6, no. 5 (2023): 1182–88. http://dx.doi.org/10.1002/cepa.2125.

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AbstractAmbient vibration tests and operational modal analysis are commonly adopted worldwide to identify the dynamic behaviour of structures because they offer several advantages such as the use of portable light equipment, the possibility to be performed without interruptions of the structure serviceability, and the use of ambient noise to globally excite the construction. Ambient vibration tests are also usually adopted in structural health monitoring systems to control changes in the dynamic behaviour of structures over the time. In this paper the dynamic identification of two multi‐span simply supported prestressed RC deck bridges in Central Italy is presented. The modal parameters of the structures are identified adopting operational modal analyses based on in‐situ ambient vibration measurements. The experimentally identified dynamics is adopted to assess the bridges' seismic retrofitting works and to investigate their dynamic behaviour in the retrofitted state.

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Monkova, Katarina, Peter Monka, Andrea Cizikova, Filip Murgas, Jan Rehor, and Milan Edl. "Modal Analysis as the Base of Dynamic Analysis." Applied Mechanics and Materials 798 (October 2015): 148–52. http://dx.doi.org/10.4028/www.scientific.net/amm.798.148.

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The article deals with the modal analysis as a tool for specification of natural frequencies and the mode shapes of the turning tool. This type of analysis is the first step that is necessary to do at the dynamic analysis of technical components. At the beginning, the verification of numerical method was realized in laboratory conditions, where the fixed beam substituted the turning tool. Vibrodiagnostics of the real cutting tool in the workshop and the modal analysis using FEM in the software PTC Creo followed. It can be said that the results of the numerical method based on FEM were comparable with the data achieved by means of experimental measurements. The work described in this paper can be considered as a foundation for the dynamic tool life analysis.

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Dissertations / Theses on the topic "Modal dynamic analysis"

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Wicks, Matthew L. "A modal analysis method for a lumped parameter model of a dynamic fluid system." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07292009-090406/.

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XHIXHA, ELONA. "PASSIVE METHOD FOR DYNAMIC CHARACTERIZATION OF SOIL AND BUILDINGS." Doctoral thesis, Università di Siena, 2017. http://hdl.handle.net/11365/1013203.

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The research followed consist mainly on the use of passive methods for dynamic characterization of soil and building. Local Seismic Response of the construction site and Calibration of FE model of a reinforced concrete building have been performed. Passive seismic measurements have been acquired by two portable seismographs synchronized by each other with GPS antenna. Subsequently, structural verifications (global structural response) have been realized using once the response spectrum estimated from Local Seismic Response and once from technical standards. Finally, confronts between results have been realized at the aim to evaluate the importance of local seismic response of soil.

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McLean, Jayse Clifton. "Modal Analysis of the Human Brain Using Dynamic Mode Decomposition." Thesis, North Dakota State University, 2020. https://hdl.handle.net/10365/31804.

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The human brain is the most important organ of the human body. It controls our thoughts, movements and emotions. For that reason, protecting the brain from harm is of the utmost importance but to protect the brain, one must first understand brain injuries. Currently, observations and criteria involving brain injury are focused around acceleration and forces. However, the brain is poorly understood in the frequency domain. This study uses finite element analysis to simulate impact for 5 different impact angles. Then a numerical technique called dynamic mode decomposition is used to extract modal properties for brain tissue in regions near the corpus callosum and brain stem. Three modal frequencies were identified with frequency ranges of (44-68) Hz, (68-155) Hz, and (114-299) Hz. Additionally, it was observed that impact angle, displacement direction, and region of the brain have a significant impact on the modal response of brain tissue during impact.

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Iglesias, Angel Moises. "Investigating Various Modal Analysis Extraction Techniques to Estimate Damping Ratio." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/35890.

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Many researchers have devoted their work to the development of modal analysis extraction techniques in order to obtain more reliable identification of the modal parameters. Also, as a consequence of all this work, there are some other works devoted to the evaluation and comparison of these methods in order to find which one is the most reliable method with respect to certain characteristics. In this thesis the Rational Fraction Polynomial (RFP) Method, the Prony or Complex Exponential Method (CEM), the Ibrahim Time Domain (ITD) Method, and Hilbert Envelope Method are used to evaluate how the accuracy of the damping ratio is affected with respect to various parameters and conditions. The investigation focuses in the estimation of damping ratio because among the modal parameters, it is the most difficult to model. Each method is evaluated individually in order to understand how the damping ratio estimation is affected with respect to each method when the characteristics of the FRF are changed. Also, they are compared to show that, in general, the Rational Fraction Polynomial Method is a more reliable method than the other methods. To investigate this, a simulated analytical data and an experimental data are processed to estimate the modal parameters, but focusing in the damping ratio. For the simulated analytical data the damping ratio's percent of error were calculated. The highest damping ratio's percent of error of the RFP was 0.0073501%. In the other hand, for the CEM, ITD, and Hilbert Envelope Method their highest damping ratio's percent of error were 83.02%, 99.82%, and 4.077%, respectively.<br>Master of Science

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Lin, Rongming. "Identification of the dynamic characteristics of nonlinear structures." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46888.

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Fu, Gen. "Full Field Reconstruction Enhanced With Operational Modal Analysis and Compressed Sensing for General Dynamic Loading." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/103741.

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In most applications, the structure components have to be tested under different loading conditions before being placed in operation. A reliable and low cost measuring technique is desirable. However, most currently employed measuring approaches can only provide the structural response at several discrete locations. The accuracy of the measurements varies with the location and orientation of the sensors. Practically, it is not possible to place sensors at all the critical locations for different excitations. Therefore, an approach that derives the full field response using a limited set of measured data is desirable. In contrast to experimental full field measurement techniques, the expansion approach involves analytically expanding the limited measurements to all the degrees of freedom of the structure. Among all the analytical methods, the modal expansion method is computationally efficient and thus more suitable for real time expansion of measured data. In this method, the full-field response is approximated by the linear combination of mode shapes. In previous studies, the modal expansion method is limited by errors from mode aliasing, inaccuracy of the calculated mode shapes and the noise in measurements. In order to overcome these limitations, the modal expansion method is enhanced by mode selection and error compensation in this study. First, the key parameters used in modal expansion method were analyzed using a cantilever beam model and a method for optimal placement of sensors was developed. A mode selection method and error compensation method based on operation modal analysis and adaptive compressed sensing techniques were then developed to reduce the effects of mode aliasing, mode shape inaccuracy and measurement noise. The developed approach was further tested virtually using a numerical model of rotor 67. The numerical model was created using a two-way coupled fluid structure interaction technique. By developing these methods, the enhanced modal expansion approach can provide full field response for structures under different load conditions. Compared to the traditional modal expansion method, it can expand the data with high noise and under general dynamic loading.<br>Doctor of Philosophy<br>Accurate knowledge of the strain and stress at critical locations of a given structure is crucial when assessing its integrity. However, currently employed measuring approaches can only provide the structural response at several discrete locations. Practically, it is not possible to place sensors at all the critical locations for different excitations. Therefore, an approach that derives the full field response using a limited set of measured data is desirable. Compared to experimental full field measurement techniques, the expansion approach is focused on analytically expanding the limited measurements to all the degrees of freedom of the structure. Among all the analytical methods, the modal expansion method is computationally efficient and thus more suitable for real-time expansion of measured data. The current modal expansion method is limited by errors from mode aliasing, inaccuracy of the mode shapes, and the noise in measurements. Therefore, an enhanced method is proposed to overcome these shortcomings of the modal expansion. The following objectives are accomplished in this study: 1) Develop a method for optimal placement of sensors for modal expansion; 2) Eliminate the mode aliasing effects by determining the significance of participated modes using operational modal analysis techniques; 3) Compensate for the noise in measurements and computational model by implementing the compressed sensing approach. After accomplishing these goals, the developed approach is able to provide full field response for structures under different load conditions. Compared to the traditional modal expansion method, it can expand the data under dynamic loading; it also shows promise in reducing the effects of noise and errors. The developed approach is numerically tested using fluid-structure interaction model of rotor 67 fan blade.

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Shutty, Michael Allen. "Dynamic modeling and modal analysis of an air-to-air missile." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/25858.

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Approved for public release; distribution is unlimited.<br>The P-3 Orion patrol airplane has a need for air-to-air missile system for defense against enemy aircraft on its long-range missions. In response to this need, the Naval Air Test Center was tasked in 1989 to conduct a P-3/AIM-9 (Sidewinder) integration program. In support of this program, a vibration test stand was established at NPS, and a ground vibration characterization was conducted to determine if a potential flutter problem existed..

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Woon, Christopher Earle. "The effects of ambient temperature variations on structural dynamic characteristics." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-12172008-063258/.

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Åkesson, Henrik. "Active control of vibration and analysis of dynamic properties concerning machine tools." Licentiate thesis, Karlskrona : Blekinge Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00360.

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Vibration in internal turning is a problem in the manufacturing industry. Vibrations appear under the excitation applied by the material deformation process during the machining of a workpiece. In order for a lathe to perform an internal turning or boring operation, for example, in a pre-drilled hole in a workpiece, it is generally required that the boring bar should be long and slender; therefore extra sensitive to vibrations. These vibrations will affect the result of machining, in particular the surface finish, also the tool life may be reduced. As a result of tool vibration, severe acoustic noise frequently occurs in the working environment. This thesis comprises three parts and the first part presents a method for active control of boring bar vibration. This method consists of an active boring bar controlled by, for example, an analog controller. The focus lies on the analog controller and the advantages that may be obtained from working in the analog domain. The controller is a lead-lag compensator with digitally controlled parameters, such as gain and phase. However, signals remain in the analog domain. In addition, the analog controller is compared with a digital adaptive controller and it is found that both controllers yield an attenuation of the vibration by up to 50 dB. The second part of this thesis concerns the dynamic properties of a clamped boring bar used by the industry. In order to design a robust controller for a certain system, knowledge about the system's dynamic properties is required. On the workshop floor, a boring bar is dismounted and remounted, and reconfiguration of boring bars will alter the dynamic properties of the clamped boring bar. The dynamic properties of a standard boring bar and an active boring bar for a number of possible clamping conditions, as well as for a linearized clamping have been investigated based on an experimental approach. Also simple Euler-Bernoulli modeling of clamped boring bars incorporating simple non-rigid models of the boring bar clamping are investigated. Initial simulations of nonlinear SDOF systems have been carried out: one with a signed squared stiffness and one with a cubic stiffness. The purpose of these simulations was to identify a nonlinearity that introduces a similar behavior in the SDOF system dynamics as the nonlinear behavior observed in the dynamic properties of a clamped boring bar. The third and final part of this thesis focuses on vibration analysis methods in engineering education. A signal analyzer (which is a commonly used instrument in signal processing and vibration analysis) was made accessible via the Internet. Assignments were developed for students to learn and practice vibration analysis on real signals from a real setup of a relevant structure; a clamped boring bar. Whilst the experimental setup was fixed, the instrument and sensor configuration nonetheless enable a variety of experiment, for example: excitation signal analysis, spectrum analysis and experimental modal analysis.

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Geeves, S. S. "Dynamic equivalents for power system stability studies combining modal analysis and coherency." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37702.

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Books on the topic "Modal dynamic analysis"

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W, Goodnight Thomas, Farkas Michael A, and NASA Glenn Research Center, eds. CM-2 environmental/modal testing of Spacehab racks. National Aeronautics and Space Administration, Glenn Research Center, 2001.

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McNelis, Mark E. CM-2 environmental/modal testing of Spacehab racks. National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Boer, A. de. A study on methods to compare measured and calculated modal data. National Aerospace Laboratory, 1993.

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Shutty, Michael Allen. Dynamic modeling and modal analysis of an air-to-air missile. Naval Postgraduate School, 1991.

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M, Adelman Howard, Haftka Raphael T, Virginia Polytechnic Institute and State University, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, eds. Sensitivity Analysis in Engineering: Proceedings of a symposium. National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1987.

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Schenk, Axel. Modal identification of a deployable space truss. National Aeronautics and Space Administration, Langley Research Center, 1990.

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S, Pappa Richard, and Langley Research Center, eds. Modal identification of a deployable space truss. National Aeronautics and Space Administration, Langley Research Center, 1990.

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Pressure Vessels and Piping Conference (1989 Honolulu, Hawaii). Application of modal analysis techniques to seismic and dynamic loadings: Presented at the 1989 ASME Pressure Vessels and Piping Conference--JSME co-sponsorship, Honolulu, Hawaii, July 23-27, 1989. American Society of Mechanical Engineers, 1989.

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Forbes, P. D. A dynamic matrix reduction process which facilitates modal frequency response analysis with the MARC system. National Engineering Laboratory, 1991.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., ed. Structural dynamic model obtained from flight use with piloted simulation and handling qualities analysis. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1996.

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Book chapters on the topic "Modal dynamic analysis"

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Coppolino, Robert N. "Experimental Modal Analysis." In The Integrated Test Analysis Process for Structural Dynamic Systems. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-031-79729-3_5.

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Doyle, James F. "Modal Analysis of Frames." In Static and Dynamic Analysis of Structures. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3420-0_11.

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Okhovat, Reza, and Anders Boström. "Dynamic Equations for an Anisotropic Cylindrical Shell." In Topics in Modal Analysis, Volume 7. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6585-0_70.

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Santos, Fábio Luis Marques dos, Bart Peeters, Marco Menchicchi, et al. "Strain-Based Dynamic Measurements and Modal Testing." In Topics in Modal Analysis II, Volume 8. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04774-4_23.

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Rhee, Huinam, Sang Jin Park, and Tae Sung Kim. "Multibody Dynamic Simulation of the Lunar Landing." In Topics in Modal Analysis II, Volume 6. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-2419-2_1.

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Pietrusiak, Damian, Przemysław Moczko, and Jerzy Czmochowski. "Field and Numerical Testing of the BWE SchRs4600.50 Dynamic Behavior." In Topics in Modal Analysis, Volume 7. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6585-0_51.

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Moya, Adam, Clifford Ho, Jeremy Sment, Todd Griffith, and Joshua Christian. "Modal Analysis and Dynamic Monitoring of a Concentrating Solar Heliostat." In Topics in Modal Analysis, Volume 7. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6585-0_53.

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Baschke, Manuel, Michael Krepl, and Delf Sachau. "Control of Dynamic Mass as Boundary Condition for Testing Substructures." In Topics in Modal Analysis, Volume 7. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6585-0_7.

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Zhu, J., A. H. Shah, and S. K. Datta. "Dynamic Modal Response Analysis of Composite Laminates." In Computational Mechanics ’95. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79654-8_424.

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Tol, Şerife, and H. Nevzat Özgüven. "Dynamic Characterization of Structural Joints Using FRF Decoupling." In Topics in Modal Analysis I, Volume 5. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-2425-3_41.

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Conference papers on the topic "Modal dynamic analysis"

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Skrivanek, Vladimir, Ondrej Rubes, and Zdenek Hadas. "Modal Properties Tuning Analysis of Dynamic System with Piezoelectric Components." In 2024 21st International Conference on Mechatronics - Mechatronika (ME). IEEE, 2024. https://doi.org/10.1109/me61309.2024.10789718.

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Shih, Po-Jen, and Hsin-Haou Huang. "Modal Decomposition Analysis of Corneal Dynamic Waveform During Air Puff Disturbance." In 2024 46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2024. https://doi.org/10.1109/embc53108.2024.10781624.

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Lin, Shuhang, Wenyue Hua, Lingyao Li, et al. "BattleAgent: Multi-modal Dynamic Emulation on Historical Battles to Complement Historical Analysis." In Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing: System Demonstrations. Association for Computational Linguistics, 2024. http://dx.doi.org/10.18653/v1/2024.emnlp-demo.18.

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Harms, Tanner, Pourya Nikouccyan, and Jonathan Naughton. "Modal Analysis of the Cycle-to-Cycle Variations Observed in Dynamic Stall." In Vertical Flight Society 74th Annual Forum & Technology Display. The Vertical Flight Society, 2018. http://dx.doi.org/10.4050/f-0074-2018-12905.

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An experiment was conducted on a two-dimensional SC1094R8 airfoil model with the intention of investigating the cycle-to-cycle variations observed in dynamic stall. Unsteady surface pressure measurements were recorded at numerous points along the airfoil surface at specific pitching conditions that displayed more than one preferred reattachment process. Sets of individual cycles that represented the dominant reattachment processes were identified and compared to the phase-average, showing significant differences in pressure distributions and aerodynamic loads. Proper Orthogonal Decomposition was then employed to the unsteady pressure distributions with the intent of isolating the influence of specific modes on the cycle-to-cycle variations. The results indicate that the importance of the modes changes depending on the particular reattachment process observed. Approved for public release: distribution unlimited. Review completed by the AMRDEC Public Affairs Office (PR3 3750, 10 April 2018).

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Schoenherr, Tyler. "Dynamic Environments Testing Focus Group." In Proposed for presentation at the International Modal Analysis Conference. US DOE, 2021. http://dx.doi.org/10.2172/1844306.

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Mazziotti, Alessandra, Giuseppe Brandonisio, Elena Mele, and Antonello De Luca. "Modal dynamic analysis of masonry churches." In INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2015 (ICCMSE 2015). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4938928.

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Pacini, Benjamin, Kai Newhouse, Samantha Ceballes, Elizabeth Martinez, and Kyle Brindley. "Nonlinear Material Characterization in Dynamic Testing: Part 1- Experiments." In International Modal Analysis Conference - Austin, Texas, United States of America - February - 2023. US DOE, 2023. http://dx.doi.org/10.2172/2432056.

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Mapa, Lidianne de Paula Pinto, Francisco Neves, Artur Ladeira, Reinaldo Reis, and Gustavo Paulinelli Guimarães. "DYNAMIC MODAL ANALYSIS BY CRAIG-BAMPTON METHOD." In 25th International Congress of Mechanical Engineering. ABCM, 2019. http://dx.doi.org/10.26678/abcm.cobem2019.cob2019-1746.

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Clark, Brennen, Matthew Allen, and Benjamin Pacini. "Case Study on the Effect of Nonlinearity in Dynamic Environment Testing." In International Modal Analysis Conference - Austin, Texas, United States of America - February - 2023. US DOE, 2023. http://dx.doi.org/10.2172/2432026.

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Querino de Souza, Matheus, and DANIEL CASTELLO. "Bayesian Operational Modal Analysis with Likelihood Free Methods." In XIX International Symposium on Dynamic Problems of Mechanics. ABCM, 2023. http://dx.doi.org/10.26678/abcm.diname2023.din2023-0127.

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Reports on the topic "Modal dynamic analysis"

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Berman, Morris, Ting Li, and Abraham Frydman. Advanced Gun System (AGS) Dynamic Characterization: Modal Test and Analysis, High-Frequency Analysis. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada373503.

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Allemang, Randall J., and David L. Brown. Experimental Modal Analysis and Dynamic Component Synthesis. Volume 5. Universal File Formats. Defense Technical Information Center, 1987. http://dx.doi.org/10.21236/ada197032.

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Allemang, Randall J., and David L. Brown. Experimental Modal Analysis and Dynamic Component Synthesis. Volume 1. Summary of Technical Work. Defense Technical Information Center, 1987. http://dx.doi.org/10.21236/ada207270.

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Ricca, Bernard. Nonlinear Time Series Analyses (Part II). Instats Inc., 2024. https://doi.org/10.61700/0emwhpkidie951390.

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This four-day seminar delves into phenomenological modeling of time series, focusing on nonlinear dynamic methodologies such as sparse identification of nonlinear dynamics, dynamic mode decomposition, and hidden Markov models, all implemented using the R programming language. Participants will enhance their research skills by learning to dynamically model, analyze, and interpret time-dependent data, ultimately enabling them to conduct innovative and robust research across various fields.

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Muthen, Bengt. Using Mplus for DSEM with Cycles (Free Seminar). Instats Inc., 2025. https://doi.org/10.61700/unxg7sciozj121479.

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This seminar provides an in-depth exploration of Dynamic Structural Equation Modeling (DSEM) using Mplus, focusing on the analysis of cyclical patterns within time-series data across various research fields. Participants will gain comprehensive skills in model construction, data analysis, and application of advanced statistical techniques, enhancing their research capabilities in capturing complex data dynamics.

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Mojidra, Rushil, and Keri Ryan. Influence of Vertical Ground Motion on Bridges Isolated with Spherical Sliding Bearings. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2019. http://dx.doi.org/10.55461/rynq3624.

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The motivation for this project developed from testing of a full scale building isolated with triple friction pendulum bearings on the E-defense shake table in Japan. The test demonstrated experimentally that the vertical component of ground motion can amplify both the base shear and the story acceleration in the isolated building. Vertical shaking introduced high-frequency variation in the axial force of the bearings, and, consequently, a high-frequency component in the bearing lateral force, which excited higher structural modes in the building. Since vertical bridges are flexible in the vertical direction because of long spans, similar effects may be observed in bridges. The objectives of this study are to develop a physical understanding of the amplification of responses and develop a simplified method to predict amplification of base shear in three-dimensional (3D) shaking relative to two-dimensional (2D) shaking, for bridges isolated with spherical sliding bearings. A series of ground motions with a wide range of vertical shaking intensity were applied to 3D models of bridges isolated with triple pendulum bearings (TPBs), both excluding the vertical component (2D motion) and including the vertical component (3D motion). This enabled the comparison of the bridge response under 2D and 3D shaking such that the direct effect of vertical shaking could be investigated. The selected ground motions were fit to target spectra in the horizontal and vertical directions, and divided into three groups based on vertical peak ground acceleration (PGAV). Multi-span concrete box girder bridges were selected for this study, as they are a prominent bridge type in California, and are suitable for seismic isolation. Models were developed for a 3-span, 45-ft wide, multi-column Base Model bridge; various superstructure and isolation-system parameter variations were implemented to evaluate the effect of these variations on the amplification of base shear. Response histories were compared for a representative motion from each ground-motion group under 2D and 3D shaking. Modal and spectral analyses were conducted to understand dynamic properties and behavior of the bridge under vertical motion. Based on simplified theory, a method to estimate the amplification of base shear due to vertical shaking was developed. The accuracy of the simplified method was assessed through a base shear normalized error metric, and different amplification factors were considered. Response history analysis showed significant amplification of base shear under 3D motion implying that exclusion of vertical component could lead to under estimation of demand shear forces on bridge piers. Deck acceleration spectral response at different locations revealed that a transverse-vertical modal coupling response was present in the Base Model bridge, which led to amplification of deck accelerations in addition to base shear due to excitation of the superstructure transverse mode. The simplified method predicted that in addition to the peak vertical ground acceleration base shear amplification depended on the isolation-system period (radius of curvature) and friction coefficient. The error in the simplified method was approximately constant across the range of isolation-system parameters. Variations in the bridge superstructure or substructure modeling parameters had only a minor effect on the base shear since the deck acts as a single mass sliding on isolators; therefore, the simplified method can be applied to a range of bridge models. The simplified method includes an amplification factor that indirectly represents the dynamic amplification of vertical acceleration from the ground to the isolation system. An amplification factor of 1.0 was found to be sufficiently conservative to estimate the base shear due to 3D shaking. The lack of apparent dynamic amplification could mean that the peak vertical acceleration is out-of-phase with the base shear. The simplified method is more likely to be unconservative for high-intensity vertical ground motions due to the complexities associated with uplift and pounding. Further investigation is recommended to determine the threshold shaking intensity limit for the simplified method.

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Wang, Chun-xi. Model Independent Analysis of Beam Dynamics in Accelerators. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/812982.

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Storm, Servaas. Tilting at Windmills: Bernanke and Blanchard’s Obsession with the Wage-Price Spiral. Institute for New Economic Thinking Working Paper Series, 2024. http://dx.doi.org/10.36687/inetwp220.

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Bernanke and Blanchard (2023) use a simple dynamic New Keynesian model of wage-price determination to explain the sharp acceleration in U.S. inflation during 2021-2023. They claim their model closely tracks the pandemic-era inflation and they confidently conclude that “… we don’t think that the recent experience justifies throwing out existing models of wage-price dynamics.” This paper argues that this confidence is misplaced. The Bernanke and Blanchard is another failed attempt to salvage establishment macroeconomics after the massive onslaught of adverse inflationary circumstances with which it could evidently not contend. It misrepresents American economic reality, hides distributional issues from view, de-politicizes (monetary and fiscal) policy-making, and sets monetary policymakers up to deliver significantly more monetary tightening than can be justified on the basis of more realistic model analyses

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Perdigão, Rui A. P. Earth System Dynamic Intelligence with Quantum Technologies: Seeing the “Invisible”, Predicting the “Unpredictable” in a Critically Changing World. Meteoceanics, 2021. http://dx.doi.org/10.46337/211028.

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We hereby embark on a frontier journey articulating two of our flagship programs – “Earth System Dynamic Intelligence” and “Quantum Information Technologies in the Earth Sciences” – to take the pulse of our planet and discern its manifold complexity in a critically changing world. Going beyond the traditional stochastic-dynamic, information-theoretic, artificial intelligence, mechanistic and hybrid approaches to information and complexity, the underlying fundamental science ignites disruptive developments empowering complex problem solving across frontier natural, social and technical geosciences. Taking aim at complex multiscale planetary problems, the roles of our flagships are put into evidence in different contexts, ranging from I) Interdisciplinary analytics, model design and dynamic prediction of hydro-climatic and broader geophysical criticalities and extremes across multiple spatiotemporal scales; to II) Sensing the pulse of our planet and detecting early warning signs of geophysical phenomena from Space with our Meteoceanics QITES Constellation, at the interface between our latest developments in non-linear dynamics and emerging quantum technologies.

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Kimhi, Ayal, Barry Goodwin, Ashok Mishra, Avner Ahituv, and Yoav Kislev. The dynamics of off-farm employment, farm size, and farm structure. United States Department of Agriculture, 2006. http://dx.doi.org/10.32747/2006.7695877.bard.

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Objectives: (1) Preparing panel data sets for both the United States and Israel that contain a rich set of farm attributes, such as size, specialization, and output composition, and farmers’ characteristics such as off-farm employment status, education, and family composition. (2) Developing an empirical framework for the joint analysis of all the endogenous variables of interest in a dynamic setting. (3) Estimating simultaneous equations of the endogenous variables using the panel data sets from both countries. (4) Analyzing, using the empirical results, the possible effects of economic policies and institutional changes on the dynamics of the farm sector. An added objective is analyzing structural changes in farm sectors in additional countries. Background: Farm sectors in developed countries, including the U.S. and Israel, have experienced a sharp decline in their size and importance during the second half of the 20th century. The overall trend is towards fewer and larger farms that rely less on family labor. These structural changes have been a reaction to changes in technology, in government policies, and in market conditions: decreasing terms of trade, increasing alternative opportunities, and urbanization pressures. As these factors continue to change, so does the structure of the agricultural sector. Conclusions: We have shown that all major dimensions of structural changes in agriculture are closely interlinked. These include farm efficiency, farm scale, farm scope (diversification), and off-farm labor. We have also shown that these conclusions hold and perhaps even become stronger whenever dynamic aspects of structural adjustments are explicitly modeled using longitudinal data. While the results vary somewhat in the different applications, several common features are observed for both the U.S. and Israel. First, the trend towards the concentration of farm production in a smaller number of larger farm enterprises is likely to continue. Second, at the micro level, increased farm size is negatively associated with increased off-farm labor, with the causality going both ways. Third, the increase in farm size is mostly achieved by diversifying farm production into additional activities (crops or livestock). All these imply that the farm sector converges towards a bi-modal farm distribution, with some farms becoming commercial while the remaining farm households either exit farming altogether or continue producing but rely heavily on off-farm income. Implications: The primary scientific implication of this project is that one should not analyze a specific farm attribute in isolation. We have shown that controlling for the joint determination of the various farm and household attributes is crucial for obtaining meaningful empirical results. The policy implications are to some extent general but could be different in the two countries. The general implication is that farm policy is an important determinant of structural changes in the farm sector. For the U.S., we have shown the different effects of coupled and decoupled (direct) farm payments on the various farm attributes, and also shown that it is important to take into account the joint farm-household decisions in order to conduct a meaningful policy analysis. Only this kind of analysis explains the indirect effect of direct farm payments on farm production decisions. For Israel, we concluded that farm policy (or lack of farm policy) has contributed to the fast structural changes we observed over the last 25 years. The sharp change of direction in farm policy that started in the early 1980s has accelerated structural changes that could have been smoother otherwise. These accelerated structural changes most likely lead to welfare losses in rural areas.

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