Modeling and simulation of loose spring skirt damping and control of vibrations in a multi-segment hanging cantilever

Nazeer, Malik Muhammad; Afzal, Muhammad Shekaib; Khan, A.F.; Ahmed, Naseer

doi:10.1016/s0045-7825(00)00282-6

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(2 citation statements)

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“…The structural integrity of pressurized piping systems is of great importance for safety and performance not only for nuclear power plants [7,8], but also for hermetic compressors [9]. This paper aims to present an experimental examination of the damping mechanism of such pipe systems.…”

Section: Introductionmentioning

confidence: 99%

“…This is the exceptional research of Malik et al [7], who have presented a theoretical model of a multi-segment hanging cantilever and auxiliary spring in order to explain the damping mechanism of LSS systems. They used an elastic bending beam model for the dynamic analysis of a multi-segment hanging cantilever and an auxiliary spring and considered the energy conservation of the total system.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Damping Mechanisms of Loose Spring Skirts on Vibrating Pipes

2010

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Damping of the loose spring skirt (LSS) of a vibrating pipe under operating conditions was studied experimentally and numerically. Motion images made using a high speed charge-coupled device (CCD) camera as well as acceleration signals were analyzed in order to correlate the physical states of the LSS pipe system with the vibration transmissibility (TM) through the pipe. Experiments on the pipe undergoing harmonic excitation demonstrate that the damping of the LSS is caused by the same mechanism as with a conventional impact damper. Measurements of the acceleration TM as a function of excitation amplitude verified that the momentum exchange between the pipe and the auxiliary spring is the cause of the damping produced by the LSS pipe. Another finding of this research is that the experimental representation of the resonance shift phenomenon is related to two main operating conditions, namely: 1) the driving frequency and 2) the excitation amplitude. This research demonstrated the occurrence of the resonance shift phenomenon through experimental mapping of the system response at increasing excitation amplitudes using frequency sweep tests. Simulations of the LSS pipe system based on principal coordinate and impact damping analysis were performed in order to investigate and provide better explanations for LSS pipe system damping mechanisms. As a result of this research study, a new damping mechanism is proposed which is different from previous damping models. This research study has also addressed more practical boundary and excitation conditions for LSS pipe systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%