Vibration analysis of long cylindrical shells using acoustical excitation

Farshidianfar, Anoshirvan; Farshidianfar, Mohammad H.; Crocker, Malcolm J.; Smith, Wesley O.

doi:10.1016/j.jsv.2011.02.002

Cited by 21 publications

(18 citation statements)

References 10 publications

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“…For the balance between acceptable accuracy and computing efficiency, hexahedral elements with a grid size of 5 mm are adopted for three-dimensional meshes. Arranging the mesh with finer elements in this way allows for vibration analysis at frequencies up to 10 kHz, which was estimated based on analytical analysis when the liner is assumed to be a uniform cylindrical shell [14]. Even so, the solution time of a whole operating cycle takes up to seven hours.…”

Section: Meshing and Boundary Conditionsmentioning

confidence: 99%

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Investigation into the Vibrational Responses of Cylinder Liners in an IC Engine Fueled with Biodiesel

Wang

et al. 2017

Applied Sciences

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Abstract:The paper presents a study of the relationship between the combustion behavior and vibration response of internal combustion (IC) engines fueled with biodiesel based on finite element modelling along with experimental evaluation. An improved finite element (FE) model is established and validated to predict the dynamic responses of cylinder liners with respect to two main sources: combustion shock and piston side thrust. Based on the validated FE model, the response characteristics of the cylinder liner in an IC engine fueled with biodiesel and its causal relationship with excitation sources have been predicted. Due to the lower calorific value of biodiesel, a greater amount of fuel is injected into the combustion chamber to maintain power outputs, which results in a prolonged combustion duration and subsequent higher overall vibration levels, compared with that of diesel. The advanced ignition of biodiesel is the main cause to the compound effect on the coupling of piston side-thrust force, thereby resulting in a nonlinear increase in the root mean square (RMS) of local vibration response close to the combustion top dead center (TDC). These key findings provides insight understandings for not only biodiesel combustion diagnostics but also more accurate diagnostics of fossil diesel based on nonintrusive vibrations.

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Section: Meshing and Boundary Conditionsmentioning

confidence: 99%

“…The material for the liner in this research is ductile cast iron QT600-3 [15]; material parameters appear in Table 1. based on analytical analysis when the liner is assumed to be a uniform cylindrical shell [14]. Even so, the solution time of a whole operating cycle takes up to seven hours.…”

Section: Meshing and Boundary Conditionsmentioning

confidence: 99%

Investigation into the Vibrational Responses of Cylinder Liners in an IC Engine Fueled with Biodiesel

Wang

et al. 2017

Applied Sciences

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“…To obtain the localised instantaneous deformations on the flanges at top end and the overall cylindrical shell, the model was configured to have 7121 hexahedral isoparametric solid elements using ANSYS Workbench. This finer element mesh arrangement is also taken into account that the vibration can have frequency contents as high as 10 kHz which was estimated based analytic analysis when the liner is assumed to be an uniform cylindrical shell [8]. To reduce the need for solution time and computing sources, the external surface of the liner and all the other components were treat as rigid body in modelling.…”

Section: ) Meshing and Solution Algorithmmentioning

confidence: 99%

“…The material parameters are listed in Table I. To avoid changing modal characteristics caused by improper extra-constraints, modelling of these fixed joints and clearance fits has not been achieved by constraining the degree of freedom, but through a series of frictionless contact pairs, which avoids possible errors induced by over-simplification and inappropriate mathematical equivalent in the modelling and analysis of cylinder dynamic process [8]. By defining boundary conditions in this way, changes in modal characteristics of cylinder liner, induced by variations in local constraint status as the result of the dynamic deformation of matched surfaces, can be more accurately taken into account in the simulation.…”

Section: ) Materials and Boundary Conditionsmentioning

confidence: 99%

A validated finite element model for predicting dynamic responses of cylinder liners in an IC engine

Wei

et al. 2016

2016 22nd International Conference on Automation and Computing (ICAC)

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Abstract-Vibration of cylinder liners affects not only engine combustion performances but also tribological behaviour and noise radiations. However, it is difficult to characterize it experimentally due to multiple sources, strong background noise, and nonlinear transfer paths. Therefore, a finite element model is established in this study to predict the dynamic responses of cylinder liners under respective sources. The model takes into account both the characteristics of structural modes and nonlinearities of assembly constraints when selecting adequate elements for efficient computation of the responses under both the highly nonlinear combustion pressure excitations and subsequent piston slap impacts. The predictions are then evaluated against experimental results under different engine operating conditions. In addition, continuous wavelet analysis is employed to process the complicated responses for key response events and their frequency ranges. The results show agreeable correspondences between the numerical predictions and measured vibration signals, paving the way for investigating its effect on combustion and lubrication processes.

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“…(12-14) and assume harmonic balance hypothesis Solving the system of obtained equations was made for the same mechanical and geometrical configuration of the long circular cylindrical shell treated experimentally in [8]. Three natural frequencies are obtained and associated to the radial, axial and circumferential mode shapes.Usually, the lowest frequency is associated with a motion that is primarily radial.…”

Section: Natural Frequencymentioning

confidence: 99%

Effects of in-plane inertia on natural frequency and stresses of long circular cylindrical shell

Rougui

Karimin

2012

MATEC Web of Conferences

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Abstract. In this paper an analytical procedure is given to study the free-vibration characteristics of thin long circular cylindrical shells with simply supported boundary conditions. An approach based on Sander's nonlinear theory and Lagrange equations is employed. Influence of in-plane inertia on natural frequencies and stress for several modes shape is discussed. Natural frequencies for a number of particular cases are evaluated and compared with some available experimental and other analytical results in the literature. The distributions of the bending and axial stresses associated with the nonlinear modes shape are given and compared with those obtained via the linear theory.

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Vibration analysis of long cylindrical shells using acoustical excitation

Cited by 21 publications

References 10 publications

Investigation into the Vibrational Responses of Cylinder Liners in an IC Engine Fueled with Biodiesel

Investigation into the Vibrational Responses of Cylinder Liners in an IC Engine Fueled with Biodiesel

A validated finite element model for predicting dynamic responses of cylinder liners in an IC engine

Effects of in-plane inertia on natural frequency and stresses of long circular cylindrical shell

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