Relevant bibliographies by topics / Ambient and Forced Vibration

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Ambient and Forced Vibration'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Ambient and Forced Vibration.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Ambient and Forced Vibration"

1

Fujino, Yozo, Masato Abe, Hajime Shibuya, Masato Yanagihara, Masashi Sato, Shun-Ichi Nakamura, and Yoshifumi Sakamoto. "Forced and Ambient Vibration Tests and Vibration Monitoring of Hakucho Suspension Bridge." Transportation Research Record: Journal of the Transportation Research Board 1696, no. 1 (January 2000): 57–63. http://dx.doi.org/10.3141/1696-43.

Full text
Abstract:
Forced and ambient dynamic tests of the Hakucho Bridge were carried out to study the dynamic characteristics of this suspension bridge. Dense-array measurement was employed in order to capture not only natural frequencies and damping, but also the mode shapes of the bridge. The natural frequencies and mode shapes obtained from the forced and ambient vibration tests agreed well with those calculated by a three-dimensional finite element model. A new method that combines the random decrement method with the Ibrahim time domain method is proposed to systematically identify the natural frequencies, damping, and mode shapes. This method is successfully applied to ambient vibration data. It is shown that the natural frequency of the first vertical bending mode decreases noticeably as the wind speed increases. It is also shown that the shape of the first vertical bending mode changes slightly near the towers, depending on the wind velocity; this finding indicates that the change may be associated with friction in the bearings at the towers. Finally, application of the Global Positioning System to measure static displacement of the girder is explained.
APA, Harvard, Vancouver, ISO, and other styles
2

Kharrazi, Mehdi H. K., and Carlos E. Ventura. "Vibration Frequencies of Woodframe Residential Construction." Earthquake Spectra 22, no. 4 (November 2006): 1015–34. http://dx.doi.org/10.1193/1.2360699.

Full text
Abstract:
Different methods of vibration measurement, such as ambient and forced vibration techniques, have been used in existing woodframe houses to determine fundamental frequency, but because of the highly nonlinear nature of this type of structural system, the reported results vary significantly. This paper discusses some of the differences of frequency values observed in various experimental studies, and identifies the source of these differences by relating the measured fundamental period to the level of shaking. The experimental results from different full-scale tests of woodframe houses and single wood shear walls are used in this paper to gain an improved understanding of the dynamic characteristics of this type of construction and to help explain the differences in results from ambient and forced vibration techniques. A simple equation to estimate forced vibration periods from ambient vibration periods is presented, and its possible application in engineering practice is discussed.
APA, Harvard, Vancouver, ISO, and other styles
3

Jafari, Mohammad Kazem, and Mohammad Davoodi. "Dynamic characteristics evaluation of Masjed Soleiman Dam using in situ dynamic tests." Canadian Geotechnical Journal 43, no. 10 (October 1, 2006): 997–1014. http://dx.doi.org/10.1139/t06-059.

Full text
Abstract:
The responses to forced vibrations, ambient vibrations, and large explosives were measured for Masjed Soleiman Dam, the highest embankment dam in Iran. Based on the results of these tests, the first 23 modal frequencies of the dam were measured and the related mode shapes for the first 16 modes were identified. A modal analysis of the dam body was also performed. The effects of reservoir water level variation, the rigidity and flexibility of the foundation and abutments and their depths and inertial properties, and the effect of material properties on the dynamic characteristics of the dam body were investigated, and the first eight modes of the dam body were identified. A comparison of the results of the numerical analysis with those from the tests indicates the best fit in lower modes occurs when the complete mass foundation is considered, whereas in higher modes the massless foundation model is a better fit.Key words: embankment dam, forced vibration test, ambient vibration test, explosion, modal properties.
APA, Harvard, Vancouver, ISO, and other styles
4

Wen, Q., XG Hua, ZQ Chen, JM Guo, and HW Niu. "Modal parameter identification of a long-span footbridge by forced vibration experiments." Advances in Structural Engineering 20, no. 5 (April 11, 2017): 661–73. http://dx.doi.org/10.1177/1369433217698322.

Full text
Abstract:
Performing forced vibration tests on full-scale structures is the most reliable way of determining the relevant modal parameters in structural dynamics, such as modal frequencies, mode shapes, modal damping, and modal masses. This study describes the modal identification of a double-level curved cable-stayed bridge with separate deck systems for pedestrians and vehicles via forced vibration tests. The steady-state structural responses to sinusoidal excitations produced by an electrodynamic shaker are recorded under varying excitation frequencies, and the frequency response functions are established. The measured frequency response functions are curve fitted to estimate the modal parameters. The numerical simulation of frequency response function–based modal parameter identification of an elastically multi-supported continuous beam structure is carried out, and the emphasis has been placed on the evaluation of the effect of an additional shaker mass, excitation frequency step and range, multi-mode vibration, and noise on identification results. Finally, the modal parameters for the first lateral mode of a double-level curved cable-stayed bridge are identified by forced vibration experiments, and the results are compared with those from ambient vibration tests and free vibration tests. The effect of the unmeasured wind excitation on identification is discussed. It is shown that the effect of ambient vibration is minor for wind velocity of 3–5 m/s. The damping ratios identified by forced and free vibration tests are comparable, while those from ambient vibration are subject to large variations. The modal mass obtained from forced vibration tests is in good agreement with finite element prediction, which provides design basis for mass-type dampers.
APA, Harvard, Vancouver, ISO, and other styles
5

Paultre, P., J. Proulx, and T. Bégin. "Ambient and forced-vibration tests of the Beauharnois suspension bridge." Canadian Journal of Civil Engineering 27, no. 6 (December 1, 2000): 1162–72. http://dx.doi.org/10.1139/l00-051.

Full text
Abstract:
Ambient and forced vibration tests were carried out on the Beauharnois Bridge, a unique, 177-m combined suspension and cable-stayed structure near Montreal. A rehabilitation program was completed on the bridge during which the deck was completely rebuilt with an orthotropic slab on two steel trusses. The rehabilitation program also included the addition of two pairs of stay cables on both towers, creating a hybrid suspension system. The paper presents a series of dynamic tests performed to evaluate the dynamic properties and the dynamic amplification factor (DAF) for the rehabilitated bridge. The experimental program involved the measurement of vertical, transverse, and longitudinal acceleration responses of the deck and tower under ambient and controlled traffic loads. Displacement, strain, and integrated acceleration DAFs were computed under different loading conditions. Modal properties were evaluated and used to correlate a three-dimensional finite element model for the bridge, including nonlinear cable behaviour. The paper discusses the experimental setup and the techniques used to evaluate vibration frequencies, mode shapes, and the DAF. Correlation of numerical dynamic properties and experimental results is also presented. Key words: cable-stayed bridge, dynamic amplification, dynamic testing, numerical correlation, modal analysis, suspension bridge.
APA, Harvard, Vancouver, ISO, and other styles
6

Aras, Fuat. "Ambient and forced vibration testing with numerical identification for RC buildings." Earthquakes and Structures 11, no. 5 (November 25, 2016): 809–22. http://dx.doi.org/10.12989/eas.2016.11.5.809.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

PENG, XUE-LIN, and HONG HAO. "A NUMERICAL STUDY OF DAMAGE DETECTION OF UNDERWATER PIPELINE USING VIBRATION-BASED METHOD." International Journal of Structural Stability and Dynamics 12, no. 03 (May 2012): 1250021. http://dx.doi.org/10.1142/s0219455412500216.

Full text
Abstract:
This paper presents a numerical investigation of the feasibility of condition monitoring of untrenched pipelines at seabed through ambient vibration measurements. A finite element (FE) model is developed to calculate the dynamic responses of pipelines to ambient wave forces. The model takes into consideration the interaction between the ocean waves, submarine pipeline, and seabed. The fluid around the pipeline is simulated using the acoustic fluid elements, while soil is simulated by springs and dashpots. The ambient hydrodynamic force in the marine environment is simulated based on the Joint North Sea Wave Observation Project (JONSWAP) spectrum. The transfer function from the wave surface elevation to the wave force is used to get the wave force spectrum. The dynamic responses of the pipe structure with different assumed damage conditions to the ambient wave forces are calculated. The calculated dynamic responses are assumed as measured ambient vibration data in condition monitoring to extract the pipeline vibration properties, which in turn are used in the FE model updating calculation to identify the pipeline conditions. Different noise levels are introduced into the calculated dynamic responses to simulate uncertainties that may arise from measurement and ambient hydrodynamic environment. The effect of noise levels on the extraction of pipeline vibration properties, and on the identification of the pipeline conditions is investigated.
APA, Harvard, Vancouver, ISO, and other styles
8

Beskhyroun, Sherif, Niusha Navabian, Liam Wotherspoon, and Quincy Ma. "Dynamic behaviour of a 13-story reinforced concrete building under ambient vibration, forced vibration, and earthquake excitation." Journal of Building Engineering 28 (March 2020): 101066. http://dx.doi.org/10.1016/j.jobe.2019.101066.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Ozcelik, O., and C. Amaddeo. "System Identification of a Base-Isolated Bridge by Ambient and Forced Vibration Tests." Journal of Testing and Evaluation 45, no. 6 (January 24, 2017): 20150505. http://dx.doi.org/10.1520/jte20150505.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hariri-Ardebili, Mohammad Amin, Hamid Rahmani Samani, and Masoud Mirtaheri. "Free and Forced Vibration Analysis of an Infilled Steel Frame: Experimental, Numerical, and Analytical Methods." Shock and Vibration 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/439591.

Full text
Abstract:
Structural frames with masonry infill panels make up a significant portion of the buildings constructed in earthquake-prone areas prior to the developing of the seismic design standards. In this paper, the effects of masonry panels on the vibration response of an infilled steel-frame building are investigated. Various ambient and steady state forced vibration tests are carried out to realize the dynamic characteristics of the system. 3D finite element models of the building with and without infill panels are provided based on marcomodeling theorem. A set of analytical approximate formulas are also derived to estimate the vibrational period. The natural frequencies of the building are computed using numerical, analytical, and experimental methods. The results show that neglecting the effect of infill panels leads to considerable error. Moreover, it is shown that there is good agreement among the results obtained by the three methods considering the effect of infill panels.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Ambient and Forced Vibration"

1

Jacobsen, Erica Dawn. "Forced Vibration Testing and Analysis of Pre- and Post- Retrofit Buildings." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/531.

Full text
Abstract:
ABSTRACT Forced Vibration Testing and Analysis of Pre- and Post- Retrofit Buildings Erica Dawn Jacobsen The primary goal of the thesis was to detect the retrofit through vibration testing of both buildings. The secondary goal focused on correctly identifying the behavior of the building through FVT, comparing that behavior to computational model predictions, and determining the necessary level of detail to include in the computational modeling. Forced vibration testing (FVT) of two stiff-wall/flexible-diaphragm buildings yielded natural frequencies and mode shapes for the two buildings. The buildings were nearly identical with the exception that one had been retrofitted. Both buildings were comprised of concrete shearwalls and steel moment frames in the north/south direction and moment frames in the east/west direction. The retrofit strengthened the moment connections and added braces to the perimeter walls in the east/west direction. The natural frequencies were found through FVT by setting a 30-lb shaker on the roof of both buildings and sweeping through a range of frequencies in both the east/west and north/south directions. Accelerometers were placed on the building to detect the accelerations. The peaks on the Fast Fourier Transform (FFT) graphs indicated the frequencies at which the structure resonated. Mode shapes were tested for by placing the shaker in a position ideal for exciting the mode and setting the shaker to the natural frequency detected from the FFT graphs. The accelerometers were placed around the roof of the building to record the mode shape. After testing, computational models were created to determine if the models could accurately predict the frequencies and mode shapes of the buildings as well as the effect of the retrofit. A series of increasingly complex computational models, ranging from hand calculations to 3D models, were created to determine the level of detail necessary to predict the building behavior. Natural frequencies were the primary criteria used to determine whether the model accurately predicted the building behavior. The mid-diaphragm deflection and base shear from spectral analysis were the final criteria used to compare these select models. It was determined that in order to properly capture the modal behavior of the building, the sawtooth framing, major beams, and the lateral-force-resisting-system (LFRS) must be modeled. Though the mode shape of the building is dominated by the flexible diaphragm, the LFRS is necessary to model to accurately predict both the natural frequency of the building as well as the diaphragm deflection.
APA, Harvard, Vancouver, ISO, and other styles
2

Ramos, Pablo D. Jr. "SYSTEM IDENTIFICATION OF A BRIDGE-TYPE BUILDING STRUCTURE." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/944.

Full text
Abstract:
The Bridge House is a steel building structure located in Poly Canyon, a rural area inside the campus of California Polytechnic State University, San Luis Obispo. The Bridge House is a one story steel structure supported on 4 concrete piers with a lateral force resisting system (LFRS) composed of ordinary moment frames in the N-S direction and braced frames in the E-W direction and vertically supported by a pair of trusses. The dynamic response of the Bridge House was investigated by means of system identification through ambient and forced vibration testing. Interesting findings such as diaphragm flexibility, foundation flexibility and frequency shifts due to thermal effects were all found throughout the mode shape mapping process. Nine apparent mode shapes were experimentally identified, N-S and E-W translational, rotational and 6 vertical modes. A computational model was also created and refined through correlation with the modal parameters obtained through FVTs. When compared to the experimental results, the computational model estimated the experimentally determined building period within 8% and 10% for both N-S and E-W translational modes and within 10% for 4 of the vertical modes.
APA, Harvard, Vancouver, ISO, and other styles
3

Bukenya, Patrick. "Ambient vibration testing of concrete dams." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10178.

Full text
Abstract:
In this thesis, seven techniques namely; rational fractional polynomial, complex exponential, frequency domain decomposition (FDD) based techniques which include; frequency domain decomposition (FDD), enhanced frequency domain decomposition (EFDD), curve fitting frequency domain decomposition (CFDD) and stochastic subspace identification (SSI) methods namely; unweighted principal component (UPC), principal component (PC) and canonical variant analysis (CVA)) have been applied to data from ambient vibration testing of two concrete dams namely; Roode Elsberg and Kouga dams.
APA, Harvard, Vancouver, ISO, and other styles
4

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/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Xing, Siyuan. "NONLINEAR MODELING FOR REGENERATIVE CUTTING WITH FORCED VIBRATION." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/dissertations/1721.

Full text
Abstract:
In this dissertation, a 2-DOF nonlinear regenerative cutting model with forced vibration from the workpiece oscillation is established. The periodic motions in such a nonlinear time-delay system are studied through a semi-analytical method. Such a method constructs an implicit mapping structure for periodic motions through the discretization of the governing delay-differential equations. The stability and bifurcations of periodic motions are predicted from the eigenvalue analysis. The periodic motions varying with excitation frequency in linear-structural and nonlinear-structural machine-tool systems are presented. The rich dynamics of the machine-tool systems are discovered. The numerical simulations of stable periodic motions are carried out from analytical predictions. Chatter may not be the chaotic motions; in fact, it can be large- amplitude periodic motions (stable and unstable). The phase difference between horizontal and vertical displacements can be used to detect chatter in machining process.
APA, Harvard, Vancouver, ISO, and other styles
6

Chern, Yi-Tzong. "Forced vibration analysis of plates and shallow shells." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1236861764.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Menday, Roger. "The forced vibration of a partially delaminated beam." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/27082.

Full text
Abstract:
The forced vibration of a partially delaminated structure such as an aircraft wing can result in catastrophic crack growth. In order to look at the underlying mechanism of the dynamics and failure of the material, a simplified model of a cantilever beam with a single delamination at its free end is considered. We investigate a number of aspects of this system, using mathematical models to gain insight into its behaviour.
APA, Harvard, Vancouver, ISO, and other styles
8

Mehdigholi, Hamid. "Forced vibration of rotating discs and interaction with non-rotating structures." Thesis, Imperial College London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445321.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Tsang, Wai Fan. "The technique of determination of structural parameters from forced vibration testing." Thesis, University of Plymouth, 1994. http://hdl.handle.net/10026.1/2820.

Full text
Abstract:
This thesis details the results of an investigation into a technique for determination of "useful" structural parameters from forced vibration testing. The implementation of this technique to full scale civil engineering structures was achieved by several developments in the experimental and computational fronts: a vibration generator and a computer-aided-testing system for the former and two computational algorithms for the latter. The experimental developments are instrumental to exciting large structures and acquisition of large quantities of useful data in digital format. These data serve as inputs to the computational algorithms whose outputs are structural parameters. These parameters are in either modal or spatial forms which cannot be measured directly but have to be extracted from the raw data. The modal-parameter-extraction method is based on direct Least-Square fitting technique and is simple to implement. The technique can yield good accuracy if the residual effects from out-of-range modes are removed from the raw data before fitting. The spatial-parameter- extraction method distinguishes itself from other conventional methods in the way that the orthogonality property is not explicitly used. This method is applicable to situations where conventional methods are not; i.e. in cases if modal matrices are not square. Some success was achieved in cases in which computer synthesized or good quality laboratory test data were used. Full scale field tests of a tall office block and a slender tower were carried out and their modal models obtained. Attempts to obtain spatial models of these structures were not carried out, however, as this task can be a separate research topic in its own right. Further research in such application is still required.
APA, Harvard, Vancouver, ISO, and other styles
10

Heerah, Arden. "Field investigation of fundamental frequency of bridges using ambient vibration measurements." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86936.

Full text
Abstract:
The transient nature of forces induced in structures during earthquakes requires the use of dynamic analyses to fully characterise their behaviour. A modal analysis describes the dynamic response of the structural system through modal descriptors: natural frequencies, mode shapes and damping ratios. Efficiently estimating these modal parameters for bridges allows for better structural integrity assessments and structural health monitoring of these structures. Using ambient vibration measurements to estimate modal parameters is time-saving and efficient. This research reviews the literature on the application of ambient vibration testing to the modal characterisation of bridges. Natural frequencies from ambient vibration measurements are obtained for a typical bridge in the City of Montréal in Canada.
The MATLAB computing platform is used to execute spectral analyses of the field measurements. Linear, analytical models of the bridges are constructed with the SAP2000 structural analysis programme and Eigenvalue analyses are performed. The experimental and analytical results are compared and discussed, followed by recommendations for the application of this procedure to other bridges in the Montréal region.
Du fait de la nature transitoire des forces se créant au sein des structures lors des tremblements de terre, la caractérisation complète de leur comportement nécessite l'utilisation d'analyses dynamiques. Une analyse modale décrit la réponse dynamique de la structure à travers ses modes de vibration : les fréquences naturelles, la forme des modes et le facteur d'amortissement. Une estimation efficace des paramètres modaux des ponts permet alors une meilleure évaluation, et donc un meilleur suivi, de leur intégrité structurale. L'utilisation des mesures de vibrations ambiantes pour estimer les paramètres modaux est donc une méthode efficace et économique. Cette étude passe en revue la littérature sur l'application de l'analyse des mesures de vibrations ambiantes pour la caractérisation modale des ponts. Les fréquences naturelles ont été obtenues sur un pont typique de la ville de Montréal.
La plate-forme informatique MATLAB a été utilisée pour effectuer des analyses spectrales de ces mesures. Des modèles analytiques linéaires ont ensuite été construits avec le programme d'analyse structurel SAP2000 pour effectuer des analyses d'Eigenvalue. Les résultats expérimentaux et analytiques sont ensuite comparés et discutés, et des recommandations énoncées, pour appliquer ce procédé à d'autres ponts de la région de Montréal.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Ambient and Forced Vibration"

1

Wenzel, Helmut, and Dieter Pichler. Ambient Vibration Monitoring. Chichester, UK: John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470024577.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Maguire, J. Selected benchmarks for forced vibration. East Kilbride, Glasgow: NAFEMS, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Maguire, J. Selected benchmarks for forced vibration. East Kilbride, Glasgow: NAFEMS, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Swansson, N. S. Investigation of blade vibration T55-L-11C compressor stages 1 and 2. Melbourne, Victoria: Aeronautical Research Laboratories, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Friesen, Timothy. A numerical investigation of large bubble translation behaviour due to forced vibration under microgravity. Ottawa: National Library of Canada, 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Szabo, J. P. A forced vibration non-resonant method for the determination of complex modulus in the audio frequency range. Dartmouth, N.S: Defence Research Establishment Atlantic, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Ambient Vibration Monitoring. Wiley, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Wenzel, Helmut, and Dieter Pichler. Ambient Vibration Monitoring. Wiley & Sons, Incorporated, John, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Wenzel, Helmut, and Dieter Pichler. Ambient Vibration Monitoring. Wiley & Sons, Incorporated, John, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Menday, Roger. The forced vibration of a partially delaminated beam. 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Ambient and Forced Vibration"

1

Yousefianmoghadam, Seyedsina, Andreas Stavridis, and Babak Moaveni. "Comparative Study on Modal Identification of a 10 Story RC Structure Using Free, Ambient and Forced Vibration Data." In Conference Proceedings of the Society for Experimental Mechanics Series, 267–76. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54777-0_33.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Shabana, Ahmed A. "Forced Vibration." In Mechanical Engineering Series, 129–76. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94271-1_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Shabana, A. A. "Forced Vibration." In Mechanical Engineering Series, 125–76. New York, NY: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-0362-6_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Shabana, A. A. "Forced Vibration." In Mechanical Engineering Series, 135–84. New York, NY: Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4612-3976-5_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Del Pedro, M., and P. Pahud. "Forced State." In Vibration Mechanics, 98–128. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3514-6_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Del Pedro, M., and P. Pahud. "Forced State of the Generalized Oscillator." In Vibration Mechanics, 281–98. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3514-6_14.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Shorr, B. F. "Unsteady Forced Vibration of Solids." In Foundations of Engineering Mechanics, 225–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-44579-1_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Aghdam, Mohammad M., and Hamed Niknam. "Nonlinear Forced Vibration of Nanobeams." In Nonlinear Approaches in Engineering Applications, 243–62. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27055-5_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Mukhopadhyay, Madhujit. "Forced Vibration of Continuous Systems." In Structural Dynamics, 371–93. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69674-0_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Schmitz, Tony L., and K. Scott Smith. "Single Degree of Freedom Forced Vibration." In Mechanical Vibrations, 83–126. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-1-4614-0460-6_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Ambient and Forced Vibration"

1

Yen, Wen-Huei P., Thomas T. Baber, and Furman W. Barton. "Ambient and Forced Vibration Tests on a Cable-Stayed Bridge." In A Collection of Expanded Papers on Nondestructive Testing from Structures Congress '93. Reston, VA: American Society of Civil Engineers, 1995. http://dx.doi.org/10.1061/9780784401316.009.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Beskhyroun, S., L. Wotherspoon, and Q. Ma. "SYSTEM IDENTIFICATION OF A 13-STORY REINFORCED CONCRETE BUILDING THROUGH AMBIENT AND FORCED VIBRATION." In 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2014. http://dx.doi.org/10.7712/120113.4750.c1082.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Kartik, V., and J. A. Wickert. "Surface Friction Guiding for Reduced High Frequency Lateral Vibration of Moving Media." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14853.

Full text
Abstract:
The free and forced vibration of a moving medium is examined in an application where distributed friction guiding is used to control lateral position passively. Sub-ambient pressure features formed in the guides intentionally modify the naturally occurring self-pressurized air bearing and increase the contact force between the medium and the guide's surface. These features increase friction to a level beyond that achievable based on the nominal wrap pressure. The moving medium is modeled as a beam that is transported over frictional regions and that is subjected to prescribed boundary disturbances arising from runout of a cartridge or pack. For axial transport at a speed that is high compared to the vibration velocity, Coulomb friction between the guides and the moving medium can be well-approximated by a derived expression for equivalent viscous damping. The equation of motion is developed for the cases of a single cylindrical guide, and of a multiplicity of guides having arbitrary placement. The level of equivalent damping for each mode decreases with transport speed, and critical speeds exist where each vibration mode transitions between the overdamped and underdamped regimes. Parameter studies in the contact pressure, transport speed, and guide geometry identify preferred design configurations for maximizing dissipation in particular modes and for attenuating high frequency response.
APA, Harvard, Vancouver, ISO, and other styles
4

McNeill, Scot. "Extending Blind Modal Identification to the Underdetermined Case for Ambient Vibration." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-93140.

Full text
Abstract:
The modal identification framework known as Blind Modal Identification (BMID) has recently been developed, drawing on techniques from Blind Source Separation (BSS). Therein, a BSS algorithm known as Second Order Blind Identification (SOBI) was adapted to solve the Modal IDentification (MID) problem. One of the drawbacks of the technique is that the number of modes identified must be less than the number of sensors used to measure the vibration of the equipment or structure. In this paper, an extension of the BMID method is presented for the underdetermined case, where the number of sensors is less than the number of modes to be identified. The analytic signal formed from measured vibration data is formed and the Second Order Blind Identification of Underdetermined Mixtures (SOBIUM) algorithm is applied to estimate the complex-valued modes and modal response autocorrelation functions. The natural frequencies and modal damping ratios are then estimated from the corresponding modal auto spectral density functions using a simple Single Degree Of Freedom (SDOF), frequency-domain method. Theoretical limitations on the number of modes identified given the number of sensors are provided. The method is demonstrated using a simulated six DOF mass-spring-dashpot system excited by white noise, where displacement at four of the six DOF is measured. All six modes are successfully identified using data from only four sensors. The method is also applied to a more realistic simulation of ambient building vibration. Seven modes in the bandwidth of interest are successfully identified using acceleration data from only five DOF. In both examples, the identified modal parameters (natural frequencies, mode shapes, modal damping ratios) are compared to the analytical parameters and are demonstrated to be of good quality.
APA, Harvard, Vancouver, ISO, and other styles
5

Dong, Lin, and Frank T. Fisher. "Analysis of Magnetic Forces in Two-Dimensional Space With Applications for the Tuning of Vibration Energy Harvesting Devices." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47647.

Full text
Abstract:
Vibration-based energy harvesting is a process by which ambient vibrations are converted to electrical energy, and is of interest for supplementing or replacing the batteries of individual nodes comprising wireless sensor networks among other applications. Generally, it is desired to match the resonant frequencies of the device with the primary ambient vibration frequencies for optimal energy harvesting performance. While previous work has demonstrated the use of magnetic forces to tune the resonant frequencies of vibrating energy harvesting structures, such efforts have been limited to one-dimensional analyzes. Here frequency tuning is realized by applying magnetic forces to the device in two-dimensional space, such that the resulting magnetic force has both horizontal and vertical components. In the case of a cantilever beam, the transverse force contributes to the transverse stiffness of the system while the axial force contributes to a change in the geometric stiffness of the beam. The effective resonant frequency of the device is then a function of the contributions of the original stiffness of the beam and the two additional stiffness components introduced by the presence of the magnet in 2D space. The simulation results from a COMSOL magnetostatics 3D model agree well with an analytical model describing the magnetic forces between the magnets as a function of location. Such 2D magnetic stiffness tuning approaches may be useful in applications where space constraints impact the available design space of the energy harvester.
APA, Harvard, Vancouver, ISO, and other styles
6

Schwitzke, Martin, Achmed Schulz, and Hans-Jörg Bauer. "Prediction of High-Frequency Blade Vibration Amplitudes in a Radial Inflow Turbine With Nozzle Guide Vanes." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94761.

Full text
Abstract:
Impeller blades in radial inflow turbines are not only exposed to high thermal loads and centrifugal forces. Additional dynamic stresses occur by the aerodynamic excitation of a variety of blade and disc modes and can lead to damages by fatigue. This is a critical consideration for engines with nozzle guide vanes in particular, where excitation is caused by the interaction between guide vanes and rotor blades. This leads to high excitation frequencies, which are within the range of eigenfrequencies of the stiff impeller. Previous experimental analyses provide vibration amplitude data for resonances in a radial inflow turbine equipped with three nozzle rings with varying vane numbers. The experimental data is used for validation of numerical investigations. The numerical work presented involves the simulation of the transient flow field of the entire turbine as a first step. Aerodynamic excitation forces on the blades are derived from the results for various resonance conditions. The influence of the operating condition and the vane number is pointed out. Higher speed and lower vane number increase the amplitudes of the blade force. In a second step, the transient and spatially resolved pressure distribution is used as a boundary condition in an FE model. The damping ratio is an essential parameter in order to calculate the forced response of the structure, and it is determined from the experimental data. The damping behavior is characterized and compared to ratios derived from additional experimental studies using laser vibrometry at the non-rotating turbine wheel under ambient conditions. A disparity in the damping ratios is recovered, depending on the eigenmodes and the boundary conditions. The forced response of the structure is computed using the individual damping ratios for four resonance conditions. Harmonic analyses are conducted, applying the pressure forces from CFD. The calculated amplitudes are validated with data from strain gauge measurements under operating condition. The prediction of the vibration amplitudes shows acceptable agreement to the test data with a tendency towards lower values.
APA, Harvard, Vancouver, ISO, and other styles
7

Mollasalehi, Ehsan, David H. Wood, and Qiao Sun. "Small Wind Turbine Tower Structural Vibration." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87736.

Full text
Abstract:
A major barrier to the acceptance of small wind turbines is that they are perceived to be noisy particularly when mounted on monopole towers rather than traditional guy-wired ones. This paper discusses an aspect of noise propagation that has not been studied previously: vibration of the tower. To start studying the tower’s behavior, twenty four accelerometers were attached in two orthogonal lines along the 10 m tower of Southwest Windpower Skystream 2.4 kW wind turbine located at the edge of the city of Calgary. About 15 minutes of data were recorded in order to extract natural frequencies and corresponding mode shapes while the turbine was in operating. Operational modal analysis (OMA), in which input loads are considered the ambient input, is conducted to identify dominant modes up to 100 Hz. This range covers the infrasound region (<20 Hz) that might be perceived at sufficiently high sound pressure levels. The captured modal frequencies and modal shapes compared favorably to those predicted by a finite element analysis. Results indicate that a cluster of modes located around 10 Hz show significantly higher magnitude than other modes. This corresponds to the second bending mode. Short-time Fourier transform was used to distinguish natural and forced frequencies. It was seen that higher modes were exited less than lower ones. Original signals were decomposed using discrete wavelet transform to obtain different frequency bands. Relative root mean square values for each frequency band were calculated to determine the contribution to the vibration energy. It was observed that most of vibration energy occurs in the lowest frequency band which is in the infrasound region. The accelerometers were monitored while the blades and generator accelerated and decelerated as the wind speed changed, and only the first bending mode was excited significantly which apparently generates most of noise emission.
APA, Harvard, Vancouver, ISO, and other styles
8

Iwasaki, Akihisa, Naoki Sawa, Shinichiro Matsubara, Seiji Kitamura, and Shigeki Okamura. "Core Seismic Experiment of a Full-Scale Single Model for a Fast Reactor." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63461.

Full text
Abstract:
A fast reactor core consists of several hundred core elements, which are hexagonal flexible beams embedded at the lower support plate in a hexagonal arrangement, separated by small gaps, and immersed in a fluid. Core elements have no support for vertical fixing in order to avoid the influence of thermal expansion and swelling. These days, in Japan, larger earthquake vibrations are postulated in seismic evaluations. So, it is necessary to consider vertical displacements (rising) and horizontal displacements of the core elements simultaneously because vertical seismic vibrations are larger than the acceleration of gravity. The 3D vibration behavior is affected by the fluid force of the ambient coolant and contact with the surrounding core elements. In this study, single-model vibration tests using a full-scale test model were conducted, and the basic characteristics of 3D vibration behavior of the core element were examined. In addition, structures restricting vertical displacements (dashpot structure) were devised, and their effectiveness was verified. As a result of the tests, the effects of the ambient condition (in air, in static water, and in flowing water), gap between the pads, vibration directions, vibration waves, and dashpot structures on the vibration behavior of the core element were examined. As regards the ambient condition, the vertical displacements were larger in flowing water that simulates the coolant flow than in air and in static water, because of upward fluid force in flowing water. As regards the gap between the pads, the larger the gaps was, the stronger the interferences due to horizontal displacements, and the smaller the vertical displacements were. The dashpot structure was verified to be suitable for reducing vertical displacements.
APA, Harvard, Vancouver, ISO, and other styles
9

Yang, Wei, Panagiotis Alevras, and Shahrzad Towfighian. "Investigation of Vibration Energy Harvesting Using Two Cantilevers With Random Input." In ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3860.

Full text
Abstract:
There is a growing interest to convert ambient mechanical energy to electrical energy by vibration energy harvesters. Realistic vibrations are random and spread over a large frequency range. Most energy harvesters are linear with narrow frequency bandwidth and show low performance, which led to creation of nonlinear harvesters that have larger bandwidth. This article presents a simulation study of a nonlinear energy harvester that contains two cantilever beams coupled by magnetic force. One of the cantilever beam is covered partially by piezoelectric material, while the other beam is normal to the first one and is used to create a variable potential energy function. The variable double-well potential function enables optimum conversion of the kinetic energy and thus larger output. The system is modeled by coupled Duffing oscillator equations. To represent the ambient vibrations, the response to Gaussian random input signal (generated by Shinozuka formula) is studied using power spectral density. The effects of different parameters on the system are also investigated. The results show that the double cantilever harvester has a threshold distance, where the harvester can perform optimally regardless of the excitation level. This observation is opposite to that of the conventional fixed magnet cantilever system where the optimal distance varies with the excitation level. Results of this study can be used to enhance energy efficiency of vibration energy harvesters.
APA, Harvard, Vancouver, ISO, and other styles
10

Wang, Wei, Junyi Cao, Shengxi Zhou, and Jing Lin. "Bistable Energy Harvesting From Human Motion." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46217.

Full text
Abstract:
Recently, the power supply for portable electronic devices using the electricity extracted from human motion and ambient vibrations has received considerable attention from multidiscipline field. Among many energy converting mechanisms, the ease miniaturization of piezoelectric cantilever structure propels many research groups to investigate the potential of efficient energy harvesting from ambient vibration using resonant phenomena. However, the incapability of traditional linear energy harvesting from low frequency or varying frequency vibrations has become an open issue. This paper investigates the feasibility of nonlinear energy harvesters with different bistable potential well functions in harvesting energy from walking and running vibration. The portable nonlinear energy harvesting device and its measurement system has been established to obtain the model parameter and excitation signal from human motion. The electromechanical model for bistable energy harvesters with different nonlinear restoring force is derived from theoretical method and experimental data. Numerical investigation under human walking and running vibrations shows that large amplitude interwell motion are easily achieved to improve energy output while the proper potential well function of bistable oscillators is designed. The comparative experiments for nonlinear energy devices with different potential well function are performed. The history and frequency spectrum of output voltage demonstrate the effectiveness of numerical simulation and the clear potential of bistable energy harvesting from human motion by means of appropriate potential function design.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Ambient and Forced Vibration"

1

Jendrzejczyk, J. A., M. W. Wambsganss, R. K. Smith, and P. Rosas-Velez. Response of the rf-extraction-wing balcony and floor, and the storage ring to forced and ambient vibration excitation and coupling to tunnel/basemat. Office of Scientific and Technical Information (OSTI), August 1993. http://dx.doi.org/10.2172/10192836.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Noble, C. R., and Hoehler, M.S., S.C. Sommer. NIF Ambient Vibration Measurements. Office of Scientific and Technical Information (OSTI), November 1999. http://dx.doi.org/10.2172/802614.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Jendrzejczyk, J. A., M. W. Wambsganss, and R. K. Smith. Response of APS storage ring basemat to ambient vibration. Office of Scientific and Technical Information (OSTI), August 1992. http://dx.doi.org/10.2172/10189025.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Hart, Carl. Vibration survey of Room 47 with a laser doppler vibrometer : Main Laboratory Basement, U.S. Army ERDC-CRREL. Engineer Research and Development Center (U.S.), November 2020. http://dx.doi.org/10.21079/11681/38919.

Full text
Abstract:
Plans are underway to create an acousto-optic laboratory on the campus of the Cold Regions Research and Engineering Laboratory. For this purpose, existing space in the basement of the Main Laboratory will be renovated. Demanding measurement techniques, such as interferometry, require a sufficiently quiet vibration environment (i.e., low vibration levels). As such, characterization of existing vibration conditions is necessary to determine vibration isolation requirements so that highly sensitive measurement activities are feasible. To this end, existing vibro-acoustic conditions were briefly surveyed in Room 47, a part of the future laboratory. The survey measured ambient noise and ambient vertical floor vibrations. The ambient vibration environment was characterized according to generic velocity criteria (VC), which are one-third octave band vibration limits. At the time of the survey, the ambient vibration environment fell under a VC-A designation, where the tolerance limit is 2000 μin/s across all one-third octave bands. Under this condition, highly sensitive measurement activities are feasible on a vibration-isolated working surface. The conclusion of this report provides isolation efficiency requirements that satisfy VC-E limits (125 μin/s), which are necessary for interferometric measurements.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Ambient and Forced Vibration' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography