Advances in Piezoelectric Transducers Part 4 docx

...  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 ... obtained:   24 4 24 ,, , y xt yxt a tx    (7) where: 4 . bb bb EJ a A   (8) A b and J b are the area and moment of inertia of the beam’s cross-section....

Ngày tải lên: 12/08/2014, 04:22

... 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 ... 40 0 kHz; (d) A0 mode at 40 0 kHz. Application of Piezoelectric Transducers in Structural Health Monitoring Techniques 103 [30] Mal AK, Chang Z, Guo D, Gorman M. Lap-joint...

Ngày tải lên: 12/08/2014, 05:20

... calculated and related in the way explained in section 2 in order to obtain the transform function f T . With these relations, the curve appearing in Figure 8 is obtained, under the minimum square error ... never intersect in a point but in an area that induces to an approximation, and thus, to an error (uncertainty) in the localization point. The intersection of two circles...

Ngày tải lên: 20/06/2014, 00:20

... bonded grains were cast in steel cartridges as shown in Fig. 9. A liner based on HTPB was used. Some minor machining was needed after casting. The propellant was easy to machine yielding a smooth ... the increase in telescope diameter, i.e., less beam divergence without affecting the flight terminal, except in relation with the greater difficulty in pointing. However, the streng...

Ngày tải lên: 20/06/2014, 00:20

... exit 4. 1.1 Get terminal from part tray // 4. 1.2 Hold and locate insertion point // 4. 1.3 Insert cable end into terminal with driver // 4. 2 Set terminal on marking board Plan 4. 2: Do 4. 2.1 ... two cables then 4. 2 then exit 4. 1 Secure cable ends on terminal 4. 2 Set terminal on marking board 4. 1 Secure cable ends on terminal Plan 4. 1: Do 4. 1.1 then repeat 4. 1.2 th...

Ngày tải lên: 21/06/2014, 06:20

... three natural frequencies (in a half logarithmic scale) Advances in Piezoelectric Transducers 44 4. 1 .4 Discrete – continuous mathematical model taking into account a bending moment generated ... 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 c...

Ngày tải lên: 12/08/2014, 04:22

... In Eq. (29), the scaling factor   0M is not retained: instead the mode shapes are scaled in order to satisfy the appropriate orthogonality conditions, as discussed in section 4. 2. Advances ... 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 tra...

Ngày tải lên: 12/08/2014, 05:20

... mode amplitude and to avoid false data interpretation in plates containing a hole of variable diameter. This Advances in Piezoelectric Transducers 94 Fig. 6. Comparison between numerical ... 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 Piezoelectric...

Ngày tải lên: 12/08/2014, 05:20

... Advances in Piezoelectric Transducers 108 ceramics combine the functions of sensor (direct piezoelectric effect) and actuator (reverse piezoelectric effect. In order to obtain the ... U sin k s           (47 )  31 11 ( ) tan 2 T babTb d Zk Fj vvjZ v U sin k s           (48 ) From Equations (41 ), (42 ), (47 ), and (48 ), we can easily obta...

Ngày tải lên: 12/08/2014, 05:20

... Monitoring. Structural Health Monitoring, DOI: 10.1177/ 147 592171 141 42 34 (published online before print), pp. 1- 14, ISSN 147 5-9217 Cawley, P. (1997). Long Range Inspection of Structures Using ... Applications, Vol. 2, 44 6 p., Springer, Berlin Rytter, A. (1993). Vibration Based Inspection of Civil Engineering Structures. Department of Building Technology and Structural Engineeri...

Ngày tải lên: 12/08/2014, 05:20