Vibration analysis of paper machine’s asymmetric tube roll supported by spherical roller bearings

Heikkinen, Janne; Ghalamchi, Behnam; Viitala, Raine; Sopanen, Jussi; Juhanko, Jari; Mikkola, Aki; Kuosmanen, Petri

doi:10.1016/j.ymssp.2017.11.030

Cited by 18 publications

(14 citation statements)

References 19 publications

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“…Hence, a rotating system must have an excitation that occurs multiple times per revolution to cause resonance. The excitations that occur multiple times per revolution can be e.g., ovality of the bearing inner ring, bending stiffness variation of a rotor or other external source [27]. Table 3 shows the calculated critical frequency and subcritical frequencies of the response measurement.…”

Section: Methodsmentioning

confidence: 99%

Unbalance Estimation for a Large Flexible Rotor Using Force and Displacement Minimization

et al. 2020

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Mass unbalance is one of the most prominent faults that occurs in rotating machines. The identification of unbalance in the case of large flexible rotors is crucial because in industrial applications such as paper machines and roll grinders, high vibrations can adversely affect the quality of the end product. The objective of this research is to determine the unbalance location, magnitude and phase for a large flexible rotor with few measured coordinates. To this end, an established force-based method comprising of modal expansion and equivalent load minimization is applied. Due to the anisotropic behavior of the test rotor, the force method required at least six measured coordinates to predict the unbalance with an error of 4 to 36%. To overcome this limitation, an alternate method, eliminating the use of modal expansion, is proposed. Here, displacements generated by varying the location of a reference unbalance along the rotor axis, are compared to measured displacements to detect the unbalance location. Furthermore, instead of force-based fault models, the minimization of displacements at measured locations determines the unbalance parameters. The test case in this study is the guiding roll of a paper machine and its different unbalance states. The algorithm is tested initially with a simulation-based model and then validated with an experimental set up. The results show that the displacement method can locate the unbalance close to the actual location and it can predict the unbalance magnitude and phase with only two measured coordinates. Lastly, using measured data from 15 measurement points across the tube section of the test rotor, a comparison shows how the selection of the two measured locations affects the estimation accuracy.

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Section: Methodsmentioning

confidence: 99%

Unbalance Estimation for a Large Flexible Rotor Using Force and Displacement Minimization

et al. 2020

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“…It must be noted that the development of a white-box model is not a one-shot activity but it must be continuously developed, adding more details if necessary. Examples of white-box modeling can be found in [54][55][56][57][58]. • Black-box model; No a priori model is available.…”

Section: Model-based Techniquesmentioning

confidence: 99%

Development of a Methodology for Condition-Based Maintenance in a Large-Scale Application Field

et al. 2018

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This paper describes a methodology, developed by the authors, for condition monitoring and diagnostics of several critical components in the large-scale applications with machines. For industry, the main target of condition monitoring is to prevent the machine stopping suddenly and thus avoid economic losses due to lack of production. Once the target is reached at a local level, usually through an R&D project, the extension to a large-scale market gives rise to new goals, such as low computational costs for analysis, easily interpretable results by local technicians, collection of data from worldwide machine installations, and the development of historical datasets to improve methodology, etc. This paper details an approach to condition monitoring, developed together with a multinational corporation, that covers all the critical points mentioned above.

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“…An inner surface can be measured using the geometry of an outer surface for example with an ultrasonic probe [14]. The procedure can be used for workpieces in which both surfaces are smooth, such as paper machine rolls [4,15,16]. A direct roundness measurement on an inner surface is also possible, but it is challenging due to the lack of space and difficult access especially with slender rotors.…”

Section: Introductionmentioning

confidence: 99%

“…The model, built with 1D elements, is based on Timoshenko beam theory and takes account of gyroscopic moment, rotary inertia, shear deformation, and asymmetry. In addition, Heikkinen et al [15] have also studied the behavior of an asymmetric rotor based on Timoshenko beam theory. In their model, the rotor, its asymmetry, and its uneven mass distribution were modeled using thickness variation data from the actual test rotor, which resulted in a realistic description.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rotor Geometry on Bending Stiffness Variation

Tiainen

Viitala

2021

Machines

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Bending stiffness variation (BSV) is a common problem causing vibration in large rotating machinery. BSV describes lateral bending stiffness and its variation as a function of the rotational angle. It has been observed that BSV causes excitation exactly twice per revolution, which leads to vibration problems, especially at half critical speed. BSV is caused by rotor geometry errors if the material is assumed to be homogeneous and linearly elastic. Therefore, the study investigated BSV with harmonic roundness components, which are commonly used in industry to describe the geometry of a rotor. Hence, the results are easily applicable in the industry. The research was conducted primarily by analytical means, but also static simulations and numeric calculations were used. The results clearly showed that when the effect of single harmonic roundness components in rotor cross-sections were observed, only the second component could produce BSV. However, when component pairs were studied, they produced BSV also without the second component. If the second component was included, the profile produced BSV the most aggressively. A generated arbitrary roundness profile, including components 3–50 with random phases and amplitudes, indicated that BSV occurs always twice per revolution despite different components in the profile. The results improve the possibilities of eliminating excessive BSV in the industry, when certain components and component pairs can be avoided.

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Vibration analysis of paper machine’s asymmetric tube roll supported by spherical roller bearings

Cited by 18 publications

References 19 publications

Unbalance Estimation for a Large Flexible Rotor Using Force and Displacement Minimization

Unbalance Estimation for a Large Flexible Rotor Using Force and Displacement Minimization

Development of a Methodology for Condition-Based Maintenance in a Large-Scale Application Field

Effect of Rotor Geometry on Bending Stiffness Variation

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