{"title":"Large Amplitude Free Vibration of Elastically Restrained Tapered Beams Resting on Non-linear Elastic Foundation","authors":"Parviz Malekzadeh, Hashem Moradi","doi":"10.1007/s40997-024-00785-8","DOIUrl":null,"url":null,"abstract":"<p>Large amplitude vibrational characteristics of variable section thin beams with edge rotations restrained by elastic torsional springs and supported on a cubic non-linear elastic foundation are studied. The motion equations and the corresponding boundary conditions are derived by employing Green’s strain together with von Kármán geometric non-linearity assumptions. The derived equations are discretized in the spatial domain using the differential quadrature method. The reliability and accuracy of the method are assessed through a comparative analysis of various available methods for beams with different geometrical parameters and boundary conditions. The study investigates the impact of various parameters on the non-linear to linear frequency ratios (NLFRs) of doubly linear and parabolic tapered beams. It is found that for double-linear tapered beams, the first three frequency ratios approach maximum values and then decrease by increasing the truncation factors. For double-parabolic tapered beams, first and third frequency ratios have maximum values, while the second frequency ratio increases initially and then remains constant. In addition, the transverse elastic coefficients depend on the shearing layer coefficient, especially for the doubly linear tapered beams. Also, in most cases, the frequency ratios decrease by increasing the transverse elastic coefficients. However, for the great values of shear layer elastic constant, the first NLFR of beams with a double-linear taper increases as the transverse elastic constants increase.</p>","PeriodicalId":49063,"journal":{"name":"Iranian Journal of Science and Technology-Transactions of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":1.5000,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Iranian Journal of Science and Technology-Transactions of Mechanical Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s40997-024-00785-8","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Large amplitude vibrational characteristics of variable section thin beams with edge rotations restrained by elastic torsional springs and supported on a cubic non-linear elastic foundation are studied. The motion equations and the corresponding boundary conditions are derived by employing Green’s strain together with von Kármán geometric non-linearity assumptions. The derived equations are discretized in the spatial domain using the differential quadrature method. The reliability and accuracy of the method are assessed through a comparative analysis of various available methods for beams with different geometrical parameters and boundary conditions. The study investigates the impact of various parameters on the non-linear to linear frequency ratios (NLFRs) of doubly linear and parabolic tapered beams. It is found that for double-linear tapered beams, the first three frequency ratios approach maximum values and then decrease by increasing the truncation factors. For double-parabolic tapered beams, first and third frequency ratios have maximum values, while the second frequency ratio increases initially and then remains constant. In addition, the transverse elastic coefficients depend on the shearing layer coefficient, especially for the doubly linear tapered beams. Also, in most cases, the frequency ratios decrease by increasing the transverse elastic coefficients. However, for the great values of shear layer elastic constant, the first NLFR of beams with a double-linear taper increases as the transverse elastic constants increase.
期刊介绍:
Transactions of Mechanical Engineering is to foster the growth of scientific research in all branches of mechanical engineering and its related grounds and to provide a medium by means of which the fruits of these researches may be brought to the attentionof the world’s scientific communities. The journal has the focus on the frontier topics in the theoretical, mathematical, numerical, experimental and scientific developments in mechanical engineering as well
as applications of established techniques to new domains in various mechanical engineering disciplines such as: Solid Mechanics, Kinematics, Dynamics Vibration and Control, Fluids Mechanics, Thermodynamics and Heat Transfer, Energy and Environment, Computational Mechanics, Bio Micro and Nano Mechanics and Design and Materials Engineering & Manufacturing.
The editors will welcome papers from all professors and researchers from universities, research centers,
organizations, companies and industries from all over the world in the hope that this will advance the scientific standards of the journal and provide a channel of communication between Iranian Scholars and their colleague in other parts of the world.