Transforming and separating rotating disk vibrations using a sensor array

Bucher, Izhak

doi:10.1016/j.jsv.2010.09.033

Cited by 6 publications

(6 citation statements)

References 20 publications

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“…Refs. [25][26][27]) or larger number of sensors to decompose the vibrations, as has been shown before [19,22]. The present problem is similar to what was presented in Ref.…”

Section: Introductionsupporting

confidence: 64%

“…A recent paper [22] proposed an approach circumventing the averaging processes associated with frequency domain methods [7] by performing the wave decomposition in the time domain. This is achieved at the cost of a somewhat complicated, dual-step procedure that isolates the time domain components associated with the individual waves traveling on the structure circumferentially.…”

Section: Introductionmentioning

confidence: 99%

“…Most set-ups contain two sensors per shaft section, but without a suitable procedure this seemingly redundant setup is seldom exploited in order tracking. While two sensors are sufficient for shaft dynamics [5,16], more sensors are needed to analyze rotating disk analysis [19,[22][23][24]. The importance of separating forward and backward shaft whirl motions has been well established in the past (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…This paper proposes a compromise between simple spectrograms or waterfall diagrams [5,16,19], standard order tracking [5,[9][10][11]29], and elaborate computationally intensive time-domain methods [22].…”

Section: Introductionmentioning

confidence: 99%

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Directional Order Tracking in Rotating Machines

Bucher

2013

Journal of Vibration and Acoustics

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This paper describes a computationally simple method to isolate transient vibration from rotating components whose frequency is tightly linked to rotation and to modes of vibration. The results can be viewed as an enhancement of computed order tracking or amplitude demodulation of multiple crossing frequency terms. By measuring the response with an array of sensors, one can compute the relative, instantaneous phase between different sensors and thus obtain information about the spatial behavior of different components with different wavelengths, frequencies, and traveling directions. An array of sensors would thus exploit spatial information to separate different vibration modes and thus gain deeper insight into the dynamical behavior. The proposed method is suitable for whirling shafts and rotating disk-like structures. It is computationally simple and fast while providing better separation of components than single sensor based approaches, in particular when ordinary methods fail to separate close frequencies. It is demonstrated that through the exploitation of cyclic symmetry of rotating structures and the angular periodicity of the vibration modes, the spectral contents of different modes can be separated. Simulated and measured data demonstrate the merits of the proposed algorithm.

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“…Refs. [25][26][27]) or larger number of sensors to decompose the vibrations, as has been shown before [19,22]. The present problem is similar to what was presented in Ref.…”

Section: Introductionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Directional Order Tracking in Rotating Machines

Bucher

2013

Journal of Vibration and Acoustics

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“…Figure 1b shows a bladed-disk Figure 1. Examples of rotating structures involving disks: (a) Simple Disk structure [3], (b) Bladed disk structure [4], (c) Disk-blade assembly [5], and (d) Disk-blades-disk assembly [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurements of the Natural Frequencies and Mode Shapes of Rotating Disk-Blades-Disk Assemblies from the Stationary Frame

et al. 2019

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Determining the natural frequencies and mode shapes of rotating turbomachinery components from both rotating and stationary reference frames is of paramount importance to avoid resonance problems that could affect the normal operation of the machine, or even cause critical damages in these components. Due to their similarity to real engineering cases, this topic has been experimentally analyzed in the past for disk-shaft assemblies and rotor disk-blades assemblies (bladed-disk or blisk). The same topic is less analyzed for disk-blades-disk assemblies, although such configurations are widely used in centrifugal closed impellers of compressors, hydraulic pumps, pump-turbines, and runners of high head Francis turbines. In this paper, experimental measurements, varying the rotating speed of a disk-blade-disk assembly and exciting the first natural frequencies of the rotating frame, have been performed. The rotating structure is excited and measured by means of PZT patches from the rotating frame and with a Laser Doppler Vibrometer (LDV). In order to interpret the experimental results obtained from the stationary frame, a method to decompose the diametrical mode shapes of the structure in simple diametrical components (which define the diametrical mode shapes of a simple disk) has been proposed. It is concluded that the resonant frequencies detected with a stationary sensor correspond to the ones predicted with the decomposition method. Finally, a means to obtain equivalent results with numerical simulation methods is shown.

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References

2011

Hilbert Transform Applications in Mechanical Vibration

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Transforming and separating rotating disk vibrations using a sensor array

Cited by 6 publications

References 20 publications

Directional Order Tracking in Rotating Machines

Directional Order Tracking in Rotating Machines

Experimental Measurements of the Natural Frequencies and Mode Shapes of Rotating Disk-Blades-Disk Assemblies from the Stationary Frame

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