Applications of Dampers for Vibration Control of Structures: An Overview

., Vajreshwari Umachagi

doi:10.15623/ijret.2013.0213002

Cited by 18 publications

(1 citation statement)

References 34 publications

(12 reference statements)

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“…The required increase in power production was achieved by increasing the flow velocity in the feed and steam piping system resulting in excessive vibration in the system [1] To address these piping vibration issues, extensive research has been carried out to analyse the causes of the vibration and mitigation steps that can be carried out to reduce the piping vibration. It has been reported that visco-damper was able to successfully address piping vibration issues in a variety of cases when compared to the use of snubbers, to address the same vibration issues [7,8]. This is because the visco-damper are more flexible, or 'softer', when compared to snubber [4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of viscous damper on the vibration transmission to the piping system and the support structure exposed to sinusoidal vibration in vertical, horizontal, and lateral directions.

Ahmad Radzi,

Dzubir,

Abdul Jalil

et al. 2024

J. Phys.: Conf. Ser.

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Viscous dampers have been shown to be a potential solution to addressing piping vibration problems. The primary objective of this study is to confirm the ability of viscous dampers in addressing piping vibration problem in a piping system at different supporting structural stiffness. The piping systems were fabricated and arranged horizontally, vertically, and axially with respect to the direction of the input vibration force. Input force was applied to the piping system using an electromagnetic shaker. A sinusoidal vertical vibration at a 5 Hz frequency (21 mm/s RMS) was applied at one end of the piping system. The use of viscous damper was varied from no viscous damper to one, two and three dampers. Results showed that having three viscous dampers installed caused the piping vibration at point P2 showed the maximum reduction in vibration of up to 80% for three axes, respectively. For the case of structural vibration, the measurement results showed that point S1 experienced the highest vibration exposure before the installation of the viscous dampers, in all axes. With the three viscous dampers installed, the maximum vibration reduction for the sinusoidal vibration test case at point S1 were 86% and 91% for the x- and z-axes, respectively. In conclusion, viscous dampers able to reduce both the piping and structural vibration in multiple axes. This study also highlights the importance of positioning dampers in reducing piping vibration and vibration transmitted to the structure, with reduction up to 90% amplitude for sinusoidal input and 80% for random input.

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Section: Introductionmentioning

confidence: 99%

Evaluation of viscous damper on the vibration transmission to the piping system and the support structure exposed to sinusoidal vibration in vertical, horizontal, and lateral directions.

Ahmad Radzi,

Dzubir,

Abdul Jalil

et al. 2024

J. Phys.: Conf. Ser.

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Effect of curing method on mechanical and morphological properties of carbon fiber epoxy composites for solid rocket motor

Chang

Zhang

et al. 2014

Polymer Composites

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Microwave (MW) curing and conventional thermal curing techniques were utilized to cure carbon fiber epoxy composites for solid rocket motor to investigate the effect of curing method on their mechanical and morphological properties. In this work, tensile and inplane shear strength properties together with morphological properties were compared between MW cured and thermally cured composites, and the mechanism for MW curing was analyzed. The study shows that 83% cure cycle time reduction is achieved through MW curing. Mechanism analysis for MW curing indicates the resin at the surface layer and interior parts of the composites is cured with different forms. Temperature monitoring during MW processing indicates the uneven electric field distribution in the domestic MW oven. Fourier transform infrared spectrum measurements reveal that MWs do not initiate any new chemical reactions during the curing process of the composites. Thermal analysis using differential scanning calorimeter reveals higher glass transition temperature (T g ) of MW cured composites compared with thermally cured counterparts. Moreover, the MW cured composites show 17% lower tensile strength than thermally cured composites, whereas a 3% increase of the inplane shear strength is observed for MW cured composites, which is also confirmed via scanning electron microscope by means of better coating the fibers with resin, increased fiber wetting and less fiber pullout. POLYM. COMPOS., 36:1703COMPOS., 36: -1711COMPOS., 36: , 2015

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