Determination of Rayleigh Damping Coefficient for Natural Damping Rubber Plate Using Finite Element Modal Analysis

Yusuf, Ahmad Idzwan; Amin, Noraziah Mohd

doi:10.1007/978-981-287-290-6_62

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…There is still an issue to fully grasp the concept of how damping mechanism works in vibration analysis even though there are many available studies on it. In the equation of motion that comprises of mass, M and stiffness, K, the determination of damping, C is nonetheless not as comprehensive as the determination of mass and stiffness [16]. This is due to the difficulty in predicting vibration parameters with respect to damping in actual practice.…”

Section: Introductionmentioning

confidence: 99%

Rayleigh Damping Coefficients of Laminated Rubber Bearing

2019

IJRTE

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In isolating the ground structure and the above ground structure from seismic loads, a significant device called laminated rubber bearing is usually found in structure. The complexity of the material which is made up from a combination of rubber and steel shim plates in alternate layer, has made it difficult to measure damping value. Damping is a dissipation of energy or energy losses in the vibration of the structure. Measuring the accurate amount of damping is fundamental as damping plays a crucial role in fixing the borderline between stability and instability in structural systems. Therefore, to determine the damping value including dynamic properties in any materials, modal analysis can be used. Hence, the main objective of this research is to determine the Rayleigh’s damping coefficients α and β and to evaluate the performance of the laminated rubber bearing using finite element and experimental modal analysis. Finding shows that, the finite element modal analysis with the addition of Rayleigh’s damping coefficients α and β, shows a good agreement with the experimental modal analysis in term of natural frequencies and mode shapes. Findings show that, the values of natural frequencies reduced when precise Rayleigh’s damping coefficient added in the finite element modal analysis. It can be concluded that both finite element and experimental modal analysis method can be used to estimate the accurate values of damping ratio and to determine the Rayleigh’s damping coefficients α and β as well.

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Section: Introductionmentioning

confidence: 99%

Rayleigh Damping Coefficients of Laminated Rubber Bearing

2019

IJRTE

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Nonlinearity of interfaces and force transmission of bolted flange joints under impact loading

Guo

Wei

Yang

et al. 2017

International Journal of Impact Engineering

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Vibration of flange joints and force transmission characteristics of connection interfaces are important due to concerns over the structural strength and signal identification in engineering structures such as missiles and rockets. However, nonlinear factors such as clearance, damping and discontinuous interfaces make it difficult to predict the responses under specific excitations such as shock impacts. This paper proposed a typical configuration of a bolted flange joint and investigated the response of vibration and dissipation of the joint under a series of impact loadings. The amplitude of excitation was 120 MPa, and the duration of the loading ranged from 20 ms to 200 ms. The excitations of high amplitude and frequency lead to a vibrational response coupled to a shock response of the joints. The connecting interfaces contributed to the distortion of the shockwave and changed its frequency, which can be characterized by the factor a. Those interfaces were also sources of energy dissipation, and their effect decreased as the frequency of excitation decreased. This methodology is helpful for predicting the local behavior of joints in a complex engineering structure under extreme conditions.

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Determination of Rayleigh Damping Coefficient for Natural Damping Rubber Plate Using Finite Element Modal Analysis

Cited by 2 publications

References 11 publications

Rayleigh Damping Coefficients of Laminated Rubber Bearing

Rayleigh Damping Coefficients of Laminated Rubber Bearing

Nonlinearity of interfaces and force transmission of bolted flange joints under impact loading

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