By Institution of Mechanical Engineers
This e-book provides the papers from the tenth foreign convention on Vibrations in Rotating equipment. This convention, first held in 1976, has outlined and redefined the state of the art within the many points of vibration encountered in rotating equipment. exclusive by means of a great mixture of business and educational participation accomplished, those papers current the most recent tools of theoretical, experimental and computational rotordynamics, along the present problems with hindrance within the additional improvement of rotating machines. subject matters are aimed toward propelling ahead the factors of excellence within the layout and operation of rotating machines.
- Presents most recent tools of theoretical, experimental and computational rotordynamics
- Covers present problems with obstacle within the additional improvement of rotating machines
Read or Download 10th International Conference on Vibrations in Rotating Machinery: 11-13 September 2012, Imeche London, UK PDF
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Additional info for 10th International Conference on Vibrations in Rotating Machinery: 11-13 September 2012, Imeche London, UK
R. Yu and C. Mote, "Vibration and parametric excitation in asymmetric circular plates under moving loads," Journal of Sound and Vibration, vol. 119, pp. 409-427, 1987. I. Bucher, O. Shomer, and H. 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.
11): 90 0 1 2 3 4 −3 −2 −1 single 80 displacement μm 70 60 50 40 30 20 10 0 0 1 2 3 4 5 6 time [sec] Figure 11. Left: Time frequency map using one sensor. (11) suffers from poor resolution, a problem usually remedied by order tracking since the instantaneous frequency of the frequency line (order) is known in advance. (11)-right). Employing the spatial Fourier transform to the orders taken from all 8 sensors, the amplitudes related to different modes of vibrations (for n=0,2,-1) are well separated.
5% asymmetry. 5Hz was exerted by the magnetic bearing. Figure 16. Left: run-up of a nearly axisymmetric system. 5% asymmetry showing the amplification of the vibration at n 2 An effective fault detection procedure would use order tracking to extract the vibration amplitude at the appropriate frequency which is speed dependent and would thus combine the approaches of sections 1,2 and 3. (16)-right when the tuned parametric excitation matches the aforementioned condition. 5 SUMMARY This paper discussed signal processing methods geared specifically to rotating machines.