Development of a prediction method of Rayleigh damping coefficients for free layer damping coatings through machine learning algorithms

Yılmaz, İlhan; Arslan, Ersen; Kızıltaş, Eda Çapa; Çavdar, Kadir

doi:10.1016/j.ijmecsci.2019.105237

Cited by 25 publications

(7 citation statements)

References 50 publications

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“…surface boundary was selected as the boundary conditions of the finite difference models, that was, the grids were generated on the model boundaries and the unbalanced forces of the freesurface grids were applied on the main grid boundaries [54]. The Rayleigh damping was adopted as the model damping, which simplified the damping matrix to a linear combination of the mass matrix and stiffness matrix [55]. The seismic fragility assessments were conducted on the embankment fill-soil foundation system and embankment fill-soil foundation-retaining wall system respectively, and the results were then compared [56,57].…”

Section: Plos Onementioning

confidence: 99%

Embankment seismic fragility assessment: A case study on Xi’an-Baoji expressway (China)

Che

Yin

Zhao³

et al. 2021

PLoS ONE

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Although embankment seismic damages are very complex, there has been little seismic fragility research yet. Researches on seismic fragility of bridges, dams and reinforced concrete (RC) structures have achieved fruitful results, which can provide references for embankment seismic fragility assessment. Meanwhile, the influencing degrees of retaining structures, such as retaining walls on the embankment seismic performances are still unclear. The K1025+470 embankment of the Xi’an-Baoji expressway was selected as the research object, and the finite difference models of the embankment fill-soil foundation system and embankment fill-soil foundation-retaining wall system were established. The ground-motion records for Incremental Dynamic Analysis (IDA) were selected and the dynamic response analysis were conducted. Probabilistic Seismic Demand Analysis (PSDA) was used to deal with the IDA results and the seismic fragility curves were generated. Based on the assessment results, the influences of the retaining wall on the embankment seismic fragility were further verified. The research results show that regardless of which seismic damage parameter is considered or the presence or absence of the retaining wall, larger PGAs always correspond to higher probabilities of each seismic damage grade. Seismic damages to the embankment fill-soil foundation-retaining wall system are always lower than those of the embankment fill-soil foundation system under the same PGA actions, thus, the retaining wall can decrease the embankment seismic fragility significantly.

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Section: Plos Onementioning

confidence: 99%

Embankment seismic fragility assessment: A case study on Xi’an-Baoji expressway (China)

Che

Yin

Zhao³

et al. 2021

PLoS ONE

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“…uncoupling method of the equations of motion in the case of linear response [24]. Assuming that the damping matrix is a linear combination of the mass and stiffness matrix, the ideal damping ratio is obtained under two pre-selected modal frequencies.…”

Section: Plos Onementioning

confidence: 99%

“…In general, modal vectors generally have no weighted orthogonality to damping matrices, then Rayleigh damping model is used to diagonalize damping matrices in this paper. Rayleigh damping model was proposed by Rayleigh in1877, which is a convenient and simple uncoupling method of the equations of motion in the case of linear response [ 24 ]. Assuming that the damping matrix is a linear combination of the mass and stiffness matrix, the ideal damping ratio is obtained under two pre-selected modal frequencies.…”

Section: Analytical Investigation On Stepped-pipe Strings With Dvamentioning

confidence: 99%

Longitudinal vibration compensation model of stepped-pipe strings in deep-sea mining

et al. 2020

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In this paper, the dynamic model of the rigid space stepped-pipe strings system is derived with Lagrangian method to represent the system dynamic behaviors which enriches the analysis method of longitudinal vibration of stepped-pipe strings. The stepped-pipe strings is constructed of pipes with different diameters and lengths, the physical properties of which mainly depends on the axial force and the depth of deep-sea mining. Based on lumped element method, the heave compensation system with dynamic vibration absorber is designed for longitudinal vibration suppression of the stepped-pipe strings. The analytical solution is obtained by modal analysis method when the mining ship is subjected to sea breeze excitation. The proposed method is easily implementable for rigid space stepped-pipe strings system with complex multi-degree-of-free deep-sea mining dynamic model. Furthermore, the optimal combination of mass ratio, spring coefficient and damping ratio is shown to have a better vibration suppression performance. Finally, numerical simulations on the stepped-pipe strings system with or without dynamic vibration absorbers are provided to demonstrate the effectiveness of the proposed method.

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“…SMC components are characterized by high glass transition ( T g ) values and so a relatively poor vibration damping performance at around room temperature 7–9 . Then, when operating at this temperature, the vibration of SMC structures would lead to detrimental effects such as noise, dynamic stresses that shorten the structural fatigue life and reduced performance 10–12 . Therefore, enhancing the vibration damping capacity of SMC structures represents an interesting field to be studied.…”

Section: Introductionmentioning

confidence: 99%

SMC/TPE bi‐layer configurations for structural vibration damping applications

Burgoa

Lekube

Zulueta

2021

J of Applied Polymer Sci

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Sheet molding compounds (SMCs) have considerable potential as lightweight alternative to traditional materials used in automotive components. However, despite their outstanding mechanical properties, their vibration damping characteristics are often relatively poor for several applications. Therefore, enhancing the vibration damping capability of SMCs represents a field with increasing interest. Application of viscoelastic layers to high stiffness materials, such as SMCs, represents an effective approach to add vibration damping functionalities to lightweight structural components. In this work, the incorporation of thermoplastic elastomers (TPEs) is studied as a novel strategy to enhance the structural vibration damping capability of SMCs. Several types of SMC and TPEs have been considered and the effect of TPE‐SMC thickness ratio on the damping and stiffness properties is investigated. The viscoelastic properties and vibration damping performance were evaluated by dynamic mechanical analysis. The effect of TPE addition on stiffness was studied by three‐point bending. Results reveal the potential of the incorporation of thin TPE layers as cost‐effective strategy to enlarge the vibration damping efficiency of SMCs while maintaining their overall high stiffness. It is expected that the bi‐material configurations presented in the current study will contribute to advance the development of new lightweight multi‐functional solutions for modern transport applications.

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Development of a prediction method of Rayleigh damping coefficients for free layer damping coatings through machine learning algorithms

Cited by 25 publications

References 50 publications

Embankment seismic fragility assessment: A case study on Xi’an-Baoji expressway (China)

Embankment seismic fragility assessment: A case study on Xi’an-Baoji expressway (China)

Longitudinal vibration compensation model of stepped-pipe strings in deep-sea mining

SMC/TPE bi‐layer configurations for structural vibration damping applications

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