Download Modal Testing: Theory, Practice and Application by D.j. Ewins PDF

By D.j. Ewins

The entire steps considering making plans, executing, examining and using the consequences from a modal attempt are defined in uncomplicated phrases. This variation has introduced the former publication modern by means of together with the entire new and more suitable strategies that experience emerged throughout the 15 years because the first variation was once written, specifically these of sign processing and modal research. New subject matters are brought, extraordinary among them are the appliance of modal trying out to rotating equipment and using scanning laser vibrometer.

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An Error is the difference between an obtained value and the true or correct value Uncertainty refers to the range of values within which we can define a quantity (that we have measured, or otherwise obtained) I n a c c u r a c y relates to the size of the error which may be associated with a quoted value Imprecision generally refers to the degree of resolution or detail with which a calculation is performed, and often accompanies the introduction of a truncated or otherwise unrefined element in the computation of a given quantity Repeatability refers to the extent to which a quantity will be found to have exactly the same (measured) value in a second or subsequent acquisition, using exactly the same process(es) Reproducibility refers to the extent to which a given result (experiment, measurement) can be reproduced a t a later date using similar procedures or equipment viewed by 90129047 with id=90129047 in 1392/4/8 11:29:26 We shall need to consider the difference between directly measured data and indirect measurements.

Viewed by 90129047 with id=90129047 in 1392/4/8 11:29:26 Fig. 12 Nyquist FRF plots for SDOF system with viscous damping (a) Receptance; (b) Mobility; (c) Accelerance Fig. 13 Nyquist FRF plots for SDOF system with structural damping (a) Receptance; (b) Mobility; (c) Accelerance Fig. 3 Lastly, we shall examine some of the basic geometric properties of the various plots we have introduced for the FRF properties of the SDOF system, or oscillator. We shall consider three specific plots: Log mobility modulus versus frequency.

1 U n d a m p e d Systems As stated, the spatial model consists of m and k. e. f (t) = 0 and for this case the governing equation of motion is: The trial solution, x(t) = xeiatleads to the requirement that: Hence the modal model consists of a single solution (mode of vibration) with a natural frequency GJ given by (k/m)'12 . Turning next to a frequency response analysis, we consider a n excitation of the form: viewed by 90129047 with id=90129047 in 1392/4/8 11:29:26 and assume a solution of the form where X and F are complex to accommodate both the amplitude and phase information (see Appendix 1).

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