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- Modal_analysis abstract "Modal analysis is the study of the dynamic properties of structures under vibrational excitation.Modal analysis is the field of measuring and analysing the dynamic response of structures and or fluids during excitation. Examples would include measuring the vibration of a car's body when it is attached to an electromagnetic shaker, or the noise pattern in a room when excited by a loudspeaker.Modern day modal analysis systems are composed of 1)sensors such as transducers (typically accelerometers, load cells), or non contact via a Laser vibrometer, or stereophotogrammetric cameras 2) data acquisition system and an analog-to-digital converter frontend (to digitize analog instrumentation signals) and 3) host PC (personal computer) to view the data and analyze it.Classically this was done with a SIMO (single-input, multiple-output) approach, that is, one excitation point, and then the response is measured at many other points. In the past a hammer survey, using a fixed accelerometer and a roving hammer as excitation, gave a MISO (multiple-input, single-output) analysis, which is mathematically identical to SIMO, due to the principle of reciprocity. In recent years MIMO (multi-input, multiple-output) have become more practical, where partial coherence analysis identifies which part of the response comes from which excitation source. Using multiple shakers leads to a uniform distribution of the energy over the entire structure and a better coherence in the measurement. A single shaker may not effectively excite all the modes of a structure.Typical excitation signals can be classed as impulse, broadband, swept sine, chirp, and possibly others. Each has its own advantages and disadvantages.The analysis of the signals typically relies on Fourier analysis. The resulting transfer function will show one or more resonances, whose characteristic mass, frequency and damping can be estimated from the measurements.The animated display of the mode shape is very useful to NVH (noise, vibration, and harshness) engineers.The results can also be used to correlate with finite element analysis normal mode solutions.".
- Modal_analysis thumbnail MIMO1.png?width=300.
- Modal_analysis wikiPageExternalLink mspace.html.
- Modal_analysis wikiPageExternalLink MPE_SDOF.php.
- Modal_analysis wikiPageID "7542417".
- Modal_analysis wikiPageLength "6143".
- Modal_analysis wikiPageOutDegree "45".
- Modal_analysis wikiPageRevisionID "706441328".
- Modal_analysis wikiPageWikiLink Accelerometer.
- Modal_analysis wikiPageWikiLink Analog_signal.
- Modal_analysis wikiPageWikiLink Broadband.
- Modal_analysis wikiPageWikiLink Category:Earthquake_engineering.
- Modal_analysis wikiPageWikiLink Category:Mechanical_engineering.
- Modal_analysis wikiPageWikiLink Classical_electromagnetism.
- Modal_analysis wikiPageWikiLink Computer.
- Modal_analysis wikiPageWikiLink Damping.
- Modal_analysis wikiPageWikiLink Digitizing.
- Modal_analysis wikiPageWikiLink Dirac_delta_function.
- Modal_analysis wikiPageWikiLink Earthquake_engineering.
- Modal_analysis wikiPageWikiLink Eigenvalues_and_eigenvectors.
- Modal_analysis wikiPageWikiLink Electromagnetism.
- Modal_analysis wikiPageWikiLink File:MIMO1.png.
- Modal_analysis wikiPageWikiLink Finite_element_method.
- Modal_analysis wikiPageWikiLink Fourier_analysis.
- Modal_analysis wikiPageWikiLink Frequency.
- Modal_analysis wikiPageWikiLink Laser_Doppler_vibrometer.
- Modal_analysis wikiPageWikiLink Load_cell.
- Modal_analysis wikiPageWikiLink Mass.
- Modal_analysis wikiPageWikiLink Modal_analysis_using_FEM.
- Modal_analysis wikiPageWikiLink Modal_testing.
- Modal_analysis wikiPageWikiLink Modeshape.
- Modal_analysis wikiPageWikiLink Noise,_vibration,_and_harshness.
- Modal_analysis wikiPageWikiLink Noise_pattern.
- Modal_analysis wikiPageWikiLink Partial_coherence.
- Modal_analysis wikiPageWikiLink Personal_computer.
- Modal_analysis wikiPageWikiLink Photogrammetry.
- Modal_analysis wikiPageWikiLink Reciprocity_(engineering).
- Modal_analysis wikiPageWikiLink Resonance.
- Modal_analysis wikiPageWikiLink Resonator.
- Modal_analysis wikiPageWikiLink Seismic_analysis.
- Modal_analysis wikiPageWikiLink Sine.
- Modal_analysis wikiPageWikiLink Spectral_density.
- Modal_analysis wikiPageWikiLink Structural_dynamics.
- Modal_analysis wikiPageWikiLink Structural_engineering.
- Modal_analysis wikiPageWikiLink Transducer.
- Modal_analysis wikiPageWikiLink Transfer_function.
- Modal_analysis wikiPageWikiLink Vibration.
- Modal_analysis wikiPageWikiLink Waveguide.
- Modal_analysis wikiPageWikiLink File:Modal_testing-detail.tif.
- Modal_analysis wikiPageWikiLinkText "Experimental Modal Analysis".
- Modal_analysis wikiPageWikiLinkText "Modal analysis".
- Modal_analysis wikiPageWikiLinkText "modal analysis".
- Modal_analysis wikiPageWikiLinkText "modal".
- Modal_analysis wikiPageUsesTemplate Template:Cn.
- Modal_analysis wikiPageUsesTemplate Template:Reflist.
- Modal_analysis subject Category:Earthquake_engineering.
- Modal_analysis subject Category:Mechanical_engineering.
- Modal_analysis hypernym Study.
- Modal_analysis type Book.
- Modal_analysis type Discipline.
- Modal_analysis type Redirect.
- Modal_analysis comment "Modal analysis is the study of the dynamic properties of structures under vibrational excitation.Modal analysis is the field of measuring and analysing the dynamic response of structures and or fluids during excitation.".
- Modal_analysis label "Modal analysis".
- Modal_analysis sameAs Q1416137.
- Modal_analysis sameAs Modal_analiz.
- Modal_analysis sameAs Modalanalyse.
- Modal_analysis sameAs Analisi_modale.
- Modal_analysis sameAs Analiza_modalna.
- Modal_analysis sameAs Análise_modal.
- Modal_analysis sameAs m.0264xj_.
- Modal_analysis sameAs Q1416137.
- Modal_analysis wasDerivedFrom Modal_analysis?oldid=706441328.
- Modal_analysis depiction MIMO1.png.
- Modal_analysis isPrimaryTopicOf Modal_analysis.