Advances in Piezoelectric Transducers Part 8 pps

... ef fects of the transducers and improve analysis of the wave propagation characteristics. 82 Advances in Piezoelectric Transducers Advances in Piezoelectric Transducers 88 A research project ... structure containing symmetrical [19] and asymmetrical [20] discontinuities in a simple and a fast way. The key point is to decompose a given damage Advances in Piez...

Ngày tải lên: 12/08/2014, 05:20

...  sin , p C P U Ut t CZ     (36) Advances in Piezoelectric Transducers 38 Fig. 8. Arrangement of forces and bending moments acting on the cut out part of the beam and the piezoelectric ... perfectly bonded piezoelectric transducer - strain of the transducer is exactly the same as the beam’s surface strain. Taking into account arrangement of forces and bending...

Ngày tải lên: 12/08/2014, 04:22

... were introduced as: Advances in Piezoelectric Transducers 46 where W is a main matrix determinant and W A is a determinant of the matrix formed by replacing the first column in the main matrix ... three natural frequencies (in a half logarithmic scale) Advances in Piezoelectric Transducers 44 4.1.4 Discrete – continuous mathematical model taking into account a bend...

Ngày tải lên: 12/08/2014, 04:22

... bimorph beam with varying piezoelectric layer coverage starting from the base and extending to the point div x , the dividing line between the two segments. Note that the point transfer matrix ... the superscript  S  indicates a linearization at constant strain (IEEE, 1 987 ). The stress within the substrate layer(s) is given simply by the linear stress- strain relationship 111,1s...

Ngày tải lên: 12/08/2014, 05:20

... brief introduction to SHM is presented in Section 2, indicating its importance, the main fields of application and the main methodologies involved. The EMI technique is discussed in Section 3. In ... example, mass, Advances in Piezoelectric Transducers 98 between the two points A and B. In fact, such a defect introduces local heterogeneity from an acoustic impedance...

Ngày tải lên: 12/08/2014, 05:20

... Advances in Piezoelectric Transducers 1 08 ceramics combine the functions of sensor (direct piezoelectric effect) and actuator (reverse piezoelectric effect. In order to obtain the ... by measuring the electrical impedance in an appropriate frequency range. This is the basic principle of damage detection discussed in the next section. Advances in Piezoelectric...

Ngày tải lên: 12/08/2014, 05:20

... Ellipse-Fitting Algorithms. IEEE Transactions on Instrumentation and Measurement, Vol. 58 No. 5, (May 2009) pp. 1 680 - 1 689 , ISSN 00 18- 9456 Royer, D. & Dieulesaint, E. (2000). Elastic Waves in ... Acousto-Optic Interaction, Applications, Vol. 2, 446 p., Springer, Berlin Rytter, A. (1993). Vibration Based Inspection of Civil Engineering Structures. Department of Building Te...

Ngày tải lên: 12/08/2014, 05:20

... λ 0 [F k −y k ], (88 ) where d 1 + d 2 + ···+ d q = 1, and λ 0 = 0. (89 ) From (89 ) it follows that the equilibrium of (88 ) corresponds to the insensitivity condition (87 ). In accordance with (84 ) and (86 ), ... law (88 ) can be rewritten as the difference 134 Advances in PID Control 18 Will-be-set-by -IN- TECH The insensitivity condition given by (66) is the discrete-time count...

Ngày tải lên: 19/06/2014, 12:20

... Satellite/Terrestr ial Networks 21 LAN LAN Internet terrestre SsS Up-link Down-link Down-link Down-link Down-link Receiving path Receiving path Receiving path Receiving path Reaching path Return path Sr 1 Sr M Sr R Sr M-1 R 1 R M R M-1 R R Fig. ... more generally, with signaling, its relative immunity to burst errors makes it interesting in the context we are examining (Tommasi et al., 200...

Ngày tải lên: 19/06/2014, 19:20

... Vibrations Analysis 132 Fig. 12. The image processing result using the ground-based test model 80 7 80 8 80 9 81 0 81 1 81 2 81 3 81 4 81 5 0 50 100 150 200 250 300 The distance of two markers ... have wide application in different disciplines of engineering. Jaffrin and Tack in their papers (Jaffrin, 20 08; Tack et al., 2006) present practical Recent Advances in...

Ngày tải lên: 19/06/2014, 19:20