Spectral Element Analysis of Non-stationary Wind Acting on Overhead Transmission Line

Dutkiewicz, Maciej; Machado, Marcela

doi:10.1007/978-3-030-54136-1_47

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…In other words, in response to the action of an external nonmonotonic loading, the phenomenon of structural hysteresis occurs in the friction shock absorber. Systems of passive and active damping of vibrations in mechanical engineering and construction were considered in the works [68][69][70]. Te studies [71,72] considered the phenomena of magnetostriction and internal damping in metals and alloys.…”

Section: Introductionmentioning

confidence: 99%

Analytical Model of Structural Damping in Friction Module of Shell Shock Absorber Connected to Spring

Shatskyi

Velychkovych

2023

Shock and Vibration

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Vibration processes play a significant role in the modern industry. In most cases, vibration reduces strength, reliability, and durability of industrial machines, mechanisms, and structures, as well as adversely affects the health of support staff. This study presents a new dry friction shell shock absorber design. The shock absorber contains two spring sections and a friction module with an open shell and an elastic filler; at the same time, the spring sections and the friction module work in parallel. The proposed device demonstrates good damping characteristics, capable of operating under high operating loads, and at the same time has compact transverse dimensions. With a nonmonotonic loading of such a shock absorber, due to the contact interaction of the filler with an open shell, part of the energy that is supplied to the system will be dissipated. In other words, in response to the action of an external nonmonotonic loading, the phenomenon of structural hysteresis occurs in the friction module of the shock absorber. To describe the deformation of the shock absorber, a mechanical and mathematical model of a shell with a cut along the generatrix, which is the main bearing link, has been developed. By means of the technique of quasistatic analysis of structural damping in nonmobile nonconservative shell systems with a deformable filler, the hysteresis loops of the presented shock absorber are analytically described. Using them, according to the known loading history, it is possible to predict the behavior of the considered nonconservative system at any time after the start of the loading process. At each stage of the cyclic loading, the distribution of stresses and relationships between the external loading and the piston displacement was studied. Inequalities are obtained for permissible loads under which the operation of the shock absorber is safe. Such shell shock absorbers are projected to be used in the mining, oil and gas, and construction industries.

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Section: Introductionmentioning

confidence: 99%

Analytical Model of Structural Damping in Friction Module of Shell Shock Absorber Connected to Spring

Shatskyi

Velychkovych

2023

Shock and Vibration

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“…To address this issue, here numerical models for the wave propagation analysis would be developed based on SEM [44,45], which is capable of obtaining accurate results in an efficient framework. SEM is formulated from the wave equation's analytical solution that reduces the number of elements in the simulation significantly [46][47][48][49][50]. The spectral transfer matrix method is employed to estimate dispersion diagrams of the unimorph beam.…”

Section: Introductionmentioning

confidence: 99%

Bandgap manipulation of single and multi-frequency smart metastructures with random impedance disorder

Machado¹,

Moura²,

Dey³

et al. 2022

Smart Mater. Struct.

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Randomness in the media breaks its periodicity aﬀecting the vibration and wave propagation performance. Such disorder caused by the variability may lead to interesting physical phenomena such as trapping and scattering waves, wave reﬂection, and energy localisation. While the randomness may be attributed to manufacturing irregularities and quantifying its eﬀect is crucial for ensuring adequate performance of a range of smart systems, these eﬀects can also be exploited for manipulating the wave properties. Here we investigate a smart metastructure in the form of a beam integrated with piezoelectric transducers coupled to a resonant shunt circuit. The piezoelectric shunt in a periodical arrangement can induce locally resonant bandgaps that can be employed in wave and vibration manipulation (and control). This paper quantiﬁes the uncertainty associated with electrical circuit components that aﬀect the circuit impedance. Such uncertainty essentially propagates to the beam smart metamaterial, inﬂuencing its wave and vibration control feature. Numerical results of the unimorph meta-beam with single and multi-frequency shunt conﬁguration show that the bandgap behaviour is sensitive to the random disorder associated with circuit impedance parameters, which can, in turn, be exploited for enhanced functionalities based on optimal RL shunt circuits for controlling structural vibration response along with wave propagation and attenuation.

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Ultimate and serviceability limit States of a wooden roof under the wind speed that may cause potential damage to the structure

Dutkiewicz,

Lamparski

2023

Proceedings of the 15th International Conference on X-Ray Microscopy – Xrm2022

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Spectral Element Analysis of Non-stationary Wind Acting on Overhead Transmission Line

Cited by 4 publications

References 16 publications

Analytical Model of Structural Damping in Friction Module of Shell Shock Absorber Connected to Spring

Analytical Model of Structural Damping in Friction Module of Shell Shock Absorber Connected to Spring

Bandgap manipulation of single and multi-frequency smart metastructures with random impedance disorder

Ultimate and serviceability limit States of a wooden roof under the wind speed that may cause potential damage to the structure

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