Experimental modal parameter identification and validation of cantilever beam

Nadkarni, Ishan; Bhardwaj, Ritvik; Ninan, Stephen; Chippa, Shriniwas

doi:10.1016/j.matpr.2020.07.396

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…According to Figure 3, Kraft paper samples were molded into a half-cane configuration with a 32.4 mm diameter (D), fixed (glued with epoxy resin) by two rigid steel rods (A304) with the same diameter. It is estimated that the half-cane configuration (I = 0.1098(R 4 − r 4 ) − 0.283R 2 r 2 (R − r)/(R + r)~393.23 mm 4 , where R and r are, respectively the major and minor radius of the sample) itself (i.e., excluding the effect of the steel rods) is able to significantly increase the moment of area, relative to the cantilever configuration (I = bh 3 /12~0.02 mm 4 , where b and h are, respectively the width and thickness of the beam). A model of the testing apparatus for the half-cane approach is shown in Figure 4, in which the same acoustic excitation through a loudspeaker and displacement measurement by a Laser Döppler Vibrometer may be observed.…”

Section: Modal Analysis-optimized Half-cane Samplementioning

confidence: 99%

“…Current numerical approaches (e.g., modal and harmonic analysis) allow a very close prediction of the dynamic behavior of structures [4], given that the input parameters for these computational routines are correctly implemented [5]. Material properties, for instance, are fundamental to obtain a reliable prediction of the dynamic behavior of a structure.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental dynamic Young's modulus. 4 321 ± 4 Figure 6. Frequency response function (FRF) of five cantilever beams with three eigenfrequencies (59 Hz, 161 Hz, and 321 Hz).…”

mentioning

confidence: 99%

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Characterizing the Frequency Response of Compliant Materials by Laser Döppler Vibrometry Coupled Acoustic Excitation

Ricarte

Meireles

Inácio³

2021

Vibration

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Low-stiffness or compliant materials are inherently difficult to characterize in terms of dynamic mechanical properties. Their free-vibration behavior is not frequently analyzed, given that performing classic vibration testing in these type of materials may imply the tampering of the results by external sources, either by changes in the geometry of the sample, by gravity-induced buckling, or the instrumentation itself (e.g., the mass of accelerometers). This study proposes an approach to determine the frequency response of these types of materials, using a noncontact methodology based on acoustic excitation and displacement measurement by Laser Döppler Vibrometry. The detailed method may be optimized by changing the sample design into a half-cane configuration to increase sample stiffness. This approach significantly increases the sample eigenmodes, facilitating their excitation by the acoustic pressure source. Numerical analysis using the values of the dynamic Young’s modulus from the experimental approaches validates the overall procedure. It is shown that the combination of numerical analysis and the proposed experimental method is a possible route for the determination of the dynamic Young’s modulus of these types of materials by inverse engineering.

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Section: Modal Analysis-optimized Half-cane Samplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterizing the Frequency Response of Compliant Materials by Laser Döppler Vibrometry Coupled Acoustic Excitation

Ricarte

Meireles

Inácio³

2021

Vibration

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“…However, experimental modal analysis (EMA) was implemented in the research effort towards analyzing certain structural components from the research effort's structural design, for validating the computational modal analysis approach. EMA has been implemented in numerous previous works, such as Rosly et al [30], Othman et al [31], Nadkarni et al [32], and many others. Through EMA, the computationally computed modal results were successfully validated, hence affording a reasonable level of confidence in the computational results.…”

Section: Introductionmentioning

confidence: 99%

Structural Responses of a Conceptual Microsatellite Structure Incorporating Perforation Patterns to Dynamic Launch Loads

Dawood

Harmin

2022

Aerospace

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Satellite systems undergo several operational phases during their service life, including the assembly phase, ground transportation phase, the launch phase, and the in-orbit operation phase. Among these phases, the one that imposes the highest level of loadings on the satellite is the launch phase. This phase involves a number of highly dynamic loads, all being imposed upon the satellite simultaneously. Investigation of the responses of the structural subsystem of a satellite to these loadings, namely its maximum deformations and maximum von Mises stresses, is critical if a reasonably high level of confidence is to be achieved. This confidence is in terms of ensuring that no material yielding develops in the structure as a result of the imposed launch loadings. In an earlier work, the structural subsystem of a conceptual microsatellite was designed, employing aluminum 6061 alloy as its material. It was then modified through introducing sets of parametrically defined geometric patterns as perforation patterns to remove material, towards reducing the structure’s total mass, as an alternative to employing composite materials. That effort led to a mass reduction percentage of 23.15%. The current work’s research effort focused on computing the responses of the perforated structure to three of the dynamic launch loads that are imposed upon satellites while being launched, namely quasi-static, random, and shock loads. These responses were then compared to those of the baseline, unperforated, version of the same structure. The values of these loads were taken from the relevant sources, with the values being nominal, and represented the loads that any satellite must qualify for before it can be accepted by the provider for inclusion in a launcher. After imposing these load values upon the structural design it was found that the structural responses indicated that the structure would successfully survive these loads without developing stresses that would lead to material yielding failure. This was deduced from computing the yield margins of safety for each loading case, and all margin values were positive, indicating that the structure, at its current development stage, did have sufficient capacity to withstand these loads without material yielding. This reinforced the conclusion of the earlier work, namely that the perforation concept did have sufficient merit to be further developed towards being implemented in future satellite designs.

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“…The accuracy of the simulation modal test was verified with experimental results. Nadkarni et al [ 16 ] identified the dynamic characteristics of a cantilever beam by experimental modal analysis, and a numerical method was carried out to validate the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical modal analysis of wall tubes in the coal‐fired boiler or radiant syngas cooler

et al. 2021

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The slag deposited on the wall tubes in the coal-fired boiler or radiant syngas cooler (RSC) of the entrained flow gasifier could reduce the heat transfer efficiency and degrade the tubes by corrosion. During the operation of the boiler or RSC, the rapping-off-ash method is an effective method to remove slag deposits, especially in a high-pressure environment. The operating parameters of the rapping-off-ash method are related to the modal parameters of wall tubes, including the natural frequency, damping ratio, and mode shapes. In

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Experimental modal parameter identification and validation of cantilever beam

Cited by 10 publications

References 7 publications

Characterizing the Frequency Response of Compliant Materials by Laser Döppler Vibrometry Coupled Acoustic Excitation

Characterizing the Frequency Response of Compliant Materials by Laser Döppler Vibrometry Coupled Acoustic Excitation

Structural Responses of a Conceptual Microsatellite Structure Incorporating Perforation Patterns to Dynamic Launch Loads

Experimental and numerical modal analysis of wall tubes in the coal‐fired boiler or radiant syngas cooler

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