Operational modal analysis application to support structure identification under rotating machinery unbalance

Martin, Leonardo Biagiotti Saint; Gusmão, Leonardo; Machado, Tiago; Okabe, Eduardo Paiva; Cavalca, Kátia Lucchesi

doi:10.1016/j.engstruct.2021.113344

Cited by 14 publications

(3 citation statements)

References 21 publications

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“…Hereafter, the estimated uncertainties were used to test the effect of a destructive loading case for a concrete beam on modal parameter estimates and their uncertainties. Saint Martin et al [9] present the use of unbalance force disturbance in a rotating machine to identify the vibration characteristics of the supporting structure. Changes to the supporting structure are found to impact the vibration characteristics which is captured using an OMA method.…”

Section: Introductionmentioning

confidence: 99%

Automated Modal Parameter Estimation for Coupled Rotor-Foundation Systems Using Seal Forces as Excitation Source

Paulsen

Damsgaard

Clemmensen

et al. 2023

Preprint

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Section: Introductionmentioning

confidence: 99%

Automated Modal Parameter Estimation for Coupled Rotor-Foundation Systems Using Seal Forces as Excitation Source

Paulsen

Damsgaard

Clemmensen

et al. 2023

Preprint

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“…The preference of OMA has significantly progressed in the last years due to the way it eases the difficult configuration of performing modal analysis during online or operating condition. [7]. Operational or also known as output-only modal analysis is an advanced method in obtaining the dynamic characteristics of a mechanical structure using the surrounding and normal operating condition as the unmeasured input [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Dynamic Characteristics of Vibrating Components and Structure Through Vibration Measurement and Operational Modal Analysis

Amirza,

Anuar,

Azhar

et al. 2023

IJIE

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Smooth plant production is utmost expected by plant owners since any unplanned shutdown is very much undesirable as it may incur loss of company’s profits and other repercussions. Critical operational assets such as rotating machineries and their components, e.g., motor, pump, compressor, and turbines are crucial to be monitored in ensuring continuous operation of the plant. Therefore, vibration being one of the elements in predictive maintenance is much needed. This paper addressesthe monitoring and findings for predictive maintenance on high vibration of a make-up gas compressor in one of the oil & gas and petrochemical plant in Malaysia. The conventional vibration measurement using vibration analyzer was utilized to identify the severity of the machine vibrations through the overall vibration value obtained on the motor and compressor. A specialized vibration measurement technique, namely, Operational Modal Analysis (OMA) was further deployed to verify the presence of resonance on the equipment by obtaining its dynamic characteristics, i.e., natural frequency and mode shape. The findings showed clear indication of resonance occurrence as similar frequency (112 Hz) was identified from both vibration measurement and operational modal analysis.

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“…Fig 16. First six vibrating modes of the rotor-foundation system at Ω = 4000 rpm (Note: the displacements are not to scale and only the upper surface of the foundation is shown).…”

mentioning

confidence: 99%

Model reduction of rotor-foundation systems using the approximate invariant manifold method

2023

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This work presents a model reduction method suited for performing nonlinear dynamic analysis of highdimensional rotor-foundation systems modeled by the finite element method. The approach consists in combining the Component Mode Synthesis (CMS) method with the Approximate Invariant Manifold Method (AIMM), and allows the obtention of forced responses through the integration of a single pair of ordinary differential equations. The proposed approach is tested using two examples: a simple and a complex rotor-foundation system. In both cases, the nonlinearity comes from the fluid-film bearings. The results show that the method can provide a significant reduction in numerical cost while still retaining good accuracy when compared with direct time integrations. By means of the proposed method, the nonlinear dynamic analysis of high-dimensional rotor-foundation system becomes a feasible option.Keywords Model reduction method • Nonlinear analysis • Rotor-foundation systems • Approximate invariant manifold method • Component mode synthesis • Fluid-film bearings. IntroductionThe complexity of rotating machines makes their design and analysis a challenging subject. One of several complicating factors is the interaction between the rotor and its supporting structure. This interaction has been shown to affect

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Operational modal analysis application to support structure identification under rotating machinery unbalance

Cited by 14 publications

References 21 publications

Automated Modal Parameter Estimation for Coupled Rotor-Foundation Systems Using Seal Forces as Excitation Source

Automated Modal Parameter Estimation for Coupled Rotor-Foundation Systems Using Seal Forces as Excitation Source

Investigation of Dynamic Characteristics of Vibrating Components and Structure Through Vibration Measurement and Operational Modal Analysis

Model reduction of rotor-foundation systems using the approximate invariant manifold method

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