By Institution of Mechanical Engineers
This ebook provides the papers from the tenth foreign convention on Vibrations in Rotating equipment, held in London, September 2012. because the first assembly during this sequence used to be held in 1976, it has outlined and re-defined what's "state of the artwork" within the many features of vibration encountered in all kinds of rotating equipment. A defining attribute of the convention is the combo of business and educational themes of the papers awarded. The ensuing interactions have made it a different discussion board for dialogue within which the most recent equipment of theoretical, experimental and computational rotordynamics are uncovered along the present problems with drawback within the additional improvement of rotating machines.
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Extra info for 10th International Conference on Vibrations in Rotating Machinery: 11-13 September 2012, IMechE London, UK
The process requires the user to apply the Hilbert transform to the measured time data. A second stage combines the data from all the sensors to perform the spatial and directional separation so as the time data (in a complex form) related to each wavelength (no. of ND). 30 sˆ1(t) s1 (t) s2 (t) sN (t) sˆ2 (t ) s5(t) sˆN (t ) 4 n 2 0 -2 -4 6000 6100 Figure 5. Schematic description of the proposed decomposition per ND and travel direction Spatial separation of transient vibrations – simulated example Consider a rotating disk whose dynamics are measured by N=16 equispaced sensors.
The amplitudes for the n related amplitudes teach these facts: (i) For n 1 , representing the forward whirl, the amplitude grows and remains steady between the forward and backward frequencies. (ii) For n 1 (backward whirl amplitude) a distinct peak can be observed when the backward frequency is crossed. g. ). 36 Figure 12. Directional 1X order for a whirling shaft. Left: TFD, Right orders for n=+1,-1 Projecting the stationary response onto body-fixed coordinates Although the decomposition provides a significant simplification of the raw measurements, the information that really matters, from strength of materials perspective, is the deformations the each material point experiences on the disk.
Raz, "C623/077/2004 Active diagnostics of rotating structures," IMECHE CONFERENCE TRANSACTIONS, vol. 2, pp. 531540, 2004. O. Shomer and I. Bucher, "SYSTEM AND METHOD FOR ACTIVE DETECTION OF ASYMMETRY IN ROTATING STRUCTURES," ed: EP Patent 1,904,975, 2008. G. Schweitzer and E. H. Maslen, Magnetic bearings: theory, design, and application to rotating machinery: Springer Verlag, 2009. I. Bucher, P. Schmiechen, D. A. Robb, and D. J. Ewins, "Laser-based measurement system for measuring the vibration on rotating discs," Proceedings of SPIE, vol.
10th International Conference on Vibrations in Rotating Machinery: 11-13 September 2012, IMechE London, UK by Institution of Mechanical Engineers