Optimal Design of Dynamic Vibration Absorber for Rolling Systems

Younes, M.

doi:10.21608/amme.2018.34728

Cited by 2 publications

(2 citation statements)

References 18 publications

(36 reference statements)

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“…The damping ratio (ζ) is used to analyze the damping characteristics of the granite-epoxy composite, which is calculated by obtaining the logarithmic decrement. The data of specimens recorded during a free vibration test is utilized to determine the logarithmic decrement (δ) as following [26]:…”

Section: Damping Testmentioning

confidence: 99%

Mechanical properties and damping characteristics of Egyptian granite-epoxy composite material

Abdelrhman,

Omar,

Hassab-Allah

et al. 2024

Mater. Res. Express

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Vibrations generated during the operations of machine tools, especially at high-speed operation impactseveral issues in machined parts such as imprecision dimensions and a poor surface finish. This promptsresearch and studies into alternative materials for machine tool structures to provide considerabledamping performance and acceptable stiffness compared to traditional materials. This paper deals withthe experimental study of a developed granite-epoxy composite, made from waste granite and localepoxy as an alternative material for machine tool structures. A waste of Egyptian Red Aswan granitewas used as filler after being crushed and sifted into three sizes: fine (less than 1 mm), medium (1 to 5mm), and coarse (5 to 8 mm). A local commercial epoxy resin kemapoxy 150 was added to a graniteaggregate mixture having grain proportions 50:25:25 for fine, medium, and large, respectively. Theinfluence of the variation of the epoxy weight ratio on the static and damping characteristics of aproposed granite–epoxy composite material was experimentally investigated. To ensure a coherentgranite-epoxy composite, the required minimum resin content of 13.88 wt.% was determined, and thegranite/epoxy ratios were selected as 85:15 wt.%, 80:20 wt.%, and 75:25 wt.%. The findings exhibitthat the largest compressive strength of 76.8 MPa and the greatest flexural strength of 35.4 MPa isachieved at the highest epoxy weight ratio of 25%. The largest damping ratio of 0.0202 is observed atthe epoxy ratio of 20% and it decreases to 0.015 when the epoxy ratio is increased to 25%. An Egyptiangranite-epoxy composite, made from waste granite and local epoxy, is a promising alternative materialfor machine tool structures. It offers both economic and environmental benefits, along with highmechanical and damping properties compared to traditional machine tool materials.

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Section: Damping Testmentioning

confidence: 99%

Mechanical properties and damping characteristics of Egyptian granite-epoxy composite material

Abdelrhman,

Omar,

Hassab-Allah

et al. 2024

Mater. Res. Express

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“…Therefore, many new ideas were developed to control the vibrations of these systems to a safe level. The installation of vibration absorbers on flexible structures are appropriate solutions for lessening the effects of serious vibrations [1][2][3]. In recent years, the tuned liquid column vibration absorber (TLCVA or TLCD) has been considered as effective in reducing system vibrations.…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Performance of a Modified Tuned Liquid Column Damper

Younes

2019

Engineering Research Journal

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The main objective of the present study is to reduce unwanted vibrations of mechanical systems through a sealed tuned liquid column damper (STLCD). A nonlinear mathematical model including nonlinear damping and air stiffness of the STLCD is considered to study the dynamic behaviour of a structure-STLCD coupled system. A parametric study to investigate the influence of the main parameters of the STLCD such as length ratio and mass ratio on the dynamic behaviour of the main system subjected to ground excitation is presented. The air volume at rest is considered as an additional design parameter. The study showed that the efficiency and the range of application of the STLCD to control the system resonance vibration are better than the traditional one. In addition, it has been noticed that the gain in vibration mitigation from the STLCD with a bigger mass higher than 7% ratio is generally modest. Also the same trend is observed when increasing its horizontal length ratio over 0.8. These enhance the actual implementation of the STLCD for small horizontal space applications. Equations for the optimum value of the initial air column height ratio and its corresponding performance index for the main structure-STLCD system as a function of both mass ratio and relative length were proposed.

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Optimal Design of Dynamic Vibration Absorber for Rolling Systems

Cited by 2 publications

References 18 publications

Mechanical properties and damping characteristics of Egyptian granite-epoxy composite material

Mechanical properties and damping characteristics of Egyptian granite-epoxy composite material

Study on the Dynamic Performance of a Modified Tuned Liquid Column Damper

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