Structural dynamics

Slavič, Janko; Mršnik, Matjaž; Česnik, Martin; Javh, Jaka; Boltežar, Miha

doi:10.1016/b978-0-12-822190-7.00008-6

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…Once the spectral moments of internal forces or stress are known, it is possible to use any frequency domain approach (such as narrow-band, Dirlik, etc.) [2,18,19,20] for assessing load cumulatives and damage.…”

Section: The Static Approachmentioning

confidence: 99%

“…The frequency domain approach for the fatigue behavior assessment of systems and components subjected to random stationary-Guassian [1] loads in frequency domain is generally reduced to the evaluation of fatigue damage (spectral methods [2]) based on the Power Spectral Density (PSD) matrix of a specific point of the component that is typically modeled by the Finite Element Method (FEM) [3]. In the analysis of structures subjected to random loads, dynamic analysis plays a fundamental role.…”

Section: Introductionmentioning

confidence: 99%

“…By analyzing this step and incorporating it into a design process in which the component has not yet assumed a definition that allows for a faithful Finite Element Modeling, the authors wanted to highlight how, with knowledge of the inputs expressed in the time domain and/or the PSD matrix, it is possible to quickly obtain the necessary information for calculating stress cumulatives or rather internal forces without undertaking a dedicated dynamic analysis aimed to obtain stress PSDs. Under the assumption that the component to design and/or verify does not participate to the dynamic of the system (thus it is characterized by a stiffness that does not modify the natural frequencies of the system or does not interact with the frequency range of the excitation), the IOP Publishing doi:10.1088/1757-899X/1306/1/012003 2 authors have demonstrated analytically and then, with a simple test case, how it is possible to obtain, starting from results expressed in the form of PSD matrices, the spectral moments [2] of individual stress characteristics or the entire stress tensor or its equivalent uniaxial synthesis for each node or element of the finite element model, using the so-called static approach [4]. In the case of a rigid behavior of the component, one could consider adopting a multibody model and dynamic simulation [5,6,7] of the system to assess fatigue behavior without the need to introduce the component as flexible bodies into the multibody model.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The oxymoron of damage assessment in dynamics by static approach

Cianetti,

Palmieri,

Zucca

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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The evaluation of fatigue damage of structural components within dynamic systems subjected to random loads is typically addressed using multibody models wherein one or more components are modeled as flexible using the modal approach. While incorporating flexible elements allows for consideration of their influence on the overall dynamic behavior of the system, certain components are intentionally designed to function as rigid bodies. Consequently, in this case the incorporation of flexible elements within multibody models merely leads to complex and time-consuming analysis. Hence, it would be more pragmatic to realize rigid body multibody models, with components characterized solely by their inertial properties, and subsequently extract the dynamic forces applied to the components to be verified. The assessment of stress can then be carried out by exploiting the principle of superposition of effects in the time domain. In this context, the objective of the present study is to develop this methodology in the frequency domain. This approach not only capitalizes on the simplicity of rigid multibody models but also harnesses the computational capabilities of the frequency-domain method for evaluating fatigue damage in components subjected to random loading conditions. This work, therefore, provides a rapid, effective, and robust method for verifying and designing rigid mechanical components integrated into dynamic systems subjected to random loads.

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Section: The Static Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The oxymoron of damage assessment in dynamics by static approach

Cianetti,

Palmieri,

Zucca

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In our case, we are dealing with a numerical model with a finite number of degrees of freedom, which can be considered as a multipledegree-of-freedom system (MDOF). For such a system, the equation of motion can be written as [16,17]:…”

Section: Random Vibration Analysis Of the Intake Pipesmentioning

confidence: 99%

Vibration Fatigue Analysis of Two Different Variants of Oil Suction Pipes

Zadravec,

Glodež,

Buzzi

et al. 2024

Materials

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In order to reduce the overall mass of the product, an improved variant of the engine oil suction pipe in hybrid design is developed and analysed as part of this paper. The vibration fatigue analysis of a simple all-metal suction pipe and the new hybrid suction pipe variant is derived using computer FEA simulations and vibration measurements on the shaker. The hybrid design of the technical components makes it possible to combine different types of materials in order to achieve the best possible properties and behaviours for the components under the influence of external loads. In our case, we combine a suction pipe made of S235JR mild steel with a 3D-printed polyamide intake funnel featuring a grid designed to prevent particles from entering the engine’s lubrication circuit. This design reduces the mass and shifts the centre of gravity closer to the attachment point of the pipe, as well as to the engine crankcase, which has a positive effect on the values of natural frequencies and vibration amplitudes. The main objective of such a hybrid suction pipe is precisely to reduce vibrations, and thus extend the service life of the components.

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“…Testing for fatigue is now an integral part for the certification of infrastructure components that are continuously exposed to the elements [16]. Actually, cyclic testing is closely related to testing for dynamic loads, since the former is basically a quasi-static procedure, i.e., a slowly varying dynamic load [17]. In recent times, this type of testing can be incorporated within the structural health monitoring (SHM) protocol, which is being increasingly applied for gaining insights to the structural condition of civil engineering infrastructure [18].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis and Experimental Verification of the Mechanical Characteristics of Variable Cross-Section Industrial Pylons

Katakalos,

Manolis,

Manos

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Variable cross-section pylons are mass produced and commonly used as components in civil engineering infrastructure, e.g., as lighting posts, in electric power lines, as wind turbines, etc. In this work, full-scale, metallic cantilevered pylons with variable crosssection were tested for use as highway lighting posts. The basic testing protocol was for fatigue, which is a low frequency, small amplitude, multiple cycle pushover test using an actuator at the top of the pylon. In terms of recording devices, a linear variable differential transducer was used for measuring displacements. Additionally, a digital imaging correlation technique was used, which gave a complete picture of the displacement field along the front face of the pylon and across the entire height. Finally, an impact hammer test was used to determine the dynamic properties of the pylon, with accelerations measured at three locations along the height of the pylon. These experimentally obtained measurements were supplemented by numerical modelling, starting with a representation of the pylon as a waveguide. This has an advantage in dynamic analyses, since it is possible to reduce the numerical model to one comprising a small number of eigenmodes, usually with as little as two. In parallel, a fully-fledged finite element method model was developed for a more detailed representation of the response of the pylon, including the question of base fixity, using a few hundred degrees-of-freedom. Finally, comparisons were carried out to help interpret the experimentally obtained results and give a complete picture of the mechanical behavior of the industrial pylon, which is useful in refining its design and for subsequent structural health monitoring purposes. 477COMPDYN 2023 9 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.

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Structural dynamics

Cited by 7 publications

References 5 publications

The oxymoron of damage assessment in dynamics by static approach

The oxymoron of damage assessment in dynamics by static approach

Vibration Fatigue Analysis of Two Different Variants of Oil Suction Pipes

Dynamic Analysis and Experimental Verification of the Mechanical Characteristics of Variable Cross-Section Industrial Pylons

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