Approach for Selection of Rayleigh Damping Parameters Used for Time History Analysis

Spears, Robert E.; Jensen, S. R.

doi:10.1115/pvp2009-77257

Cited by 16 publications

(11 citation statements)

References 2 publications

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“…In the calculations, according to [14], the damping coefficient ξ = 0.05 was used. Dynamic calculations were made using the Rayleigh damping model [3,9].…”

Section: The Condition Of the Load-bearing Capacity Of The Supportsmentioning

confidence: 99%

A Proposal for an Assessment Method of the Dynamic Resistance of Concrete Slab Viaducts Subjected to Impact Loads Caused by Mining Tremors

Rusek

2017

ZNPRzBiS

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The article presents a method for assessing dynamic resistance of existing reinforced concrete slab road viaducts subjected to mining tremors. For this purpose there are formulated six criteria to determine the maximum permissible value of the component ground vibrations (a x,dop , a y,dop, a z,dop).Within each criterion, a reference is made to the most critical components, for which for which the Author has formulated strength and kinematic conditions, reflecting the behaviour of the structure under dynamic excitation caused by mining tremor. The permissible range of structural behaviour was set by comparing the effects of load combinations adopted at the design stage with a seismic combination proposed in [12]. In the field of dynamic analysis the response spectrum method was used, taking into account the guidelines for the adaptation of Eurocode 8 for the calculation the response of construction to the influence of mining tremors. Finally, in accordance with the established procedure calculations were carried out and and results are presented for a sample reinforced concrete slab road viaduct.

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“…In the calculations, according to [14], the damping coefficient ξ = 0.05 was used. Dynamic calculations were made using the Rayleigh damping model [3,9].…”

Section: The Condition Of the Load-bearing Capacity Of The Supportsmentioning

confidence: 99%

A Proposal for an Assessment Method of the Dynamic Resistance of Concrete Slab Viaducts Subjected to Impact Loads Caused by Mining Tremors

Rusek

2017

ZNPRzBiS

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“…A constant damping is often applied for better numerical stability. However, in reality, the damping can vary significantly, and constant damping can result in an unreasonable response in the time history analysis (Kandge, 2007;Spears and Jensen, 2012). Therefore, three values of the Rayleigh damping are chosen, in which RD3 is the recommended value from DNV (2012).…”

Section: Structural Damping Of the Mooring Linementioning

confidence: 99%

A comparison of coupled and de-coupled simulation procedures for the fatigue analysis of wave energy converter mooring lines

et al. 2016

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Newcastle University ePrints -eprint.ncl.ac.uk Yang S, Ringsberg JW, Johnson E, Hu ZQ. A comparison of coupled and decoupled simulation procedures for the fatigue analysis of wave energy converter mooring lines. Ocean Engineering 2016, 117, 332-345. AbstractMooring systems for floating wave energy converters (WECs) must be designed to survive the cyclical loads and motions to which they are subjected as a result of the wave load-WEC interaction and the motions of the WEC in the random elevation of the sea surface. The current study compares simulation procedures for the fatigue analysis of WEC moorings. The objective is to suggest a simulation procedure suitable for an extensive study of the behaviour of WEC systems and thus for the fatigue analysis of mooring lines. A cylindrical, floating WEC with four spread mooring lines is chosen as case study. The dynamics of the WEC system are simulated and analysed using both coupled and de-coupled models in the timedomain. Four types of simulation procedures are compared using commercial software, DNV DeepC, and an in-house solver, MooDy. A systematic fatigue response analysis based on variations of the numerical and physical parameters is conducted. The results are compared with respect to the fatigue damage calculated using the stress-based approach and the rainflow counting method. The simulation procedure using a coupled model is suggested as the preferred numerical method for capturing the interaction between the components of WEC system, which is proven to be crucial for the fatigue damage evaluation of mooring lines.

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“…where α and β are real scalars that need to be determined. To do that, many methods are available (Spears and Jensen, 2009) and (Adhikari, 2000). However, a method that was developed by (Chowdhury and Dasgupta, 2003) is used in this work.…”

Section: Damping Characteristicsmentioning

confidence: 99%

Modeling and Active Vibration Control of a Smart Structure

Ghareeb¹,

Schmidt²

2012

Proceedings of the 9th International Conference on Informatics in Control, Automation and Robotics

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Active vibration control of flexible structures has gained much attention in the last decades. The major components of any active vibration control system are the mechanical structure suseptible to vibration, sensor(s) to perceive it, actuator(s) to counteract the influence of disturbances causing vibration and finally, the controller responsible for the generation of appropriate control signals. In this paper, a Lyapunov function controller and a strain rate feedback controller (SRF) are used to attentuate the vibrations of a cantilivered smart beam excited by its first eigenmode. A super element (SE) with a finite number of degrees of freedom (DOF) is derived from the modified and damped finite element (FE) model. The state-space (SS) equations of the same model are also extracted. Controllers are applied to the SE and SS models and results are presented and compared.

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Approach for Selection of Rayleigh Damping Parameters Used for Time History Analysis

Cited by 16 publications

References 2 publications

A Proposal for an Assessment Method of the Dynamic Resistance of Concrete Slab Viaducts Subjected to Impact Loads Caused by Mining Tremors

A Proposal for an Assessment Method of the Dynamic Resistance of Concrete Slab Viaducts Subjected to Impact Loads Caused by Mining Tremors

A comparison of coupled and de-coupled simulation procedures for the fatigue analysis of wave energy converter mooring lines

Modeling and Active Vibration Control of a Smart Structure

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