health monitoring of composite structures using ultrasonic guided waves

... training data consists of pairs of input objects and a desired output value In our case, the training data consists of a set of p repetitive cycles of a specific dance figure of which we process the ... visual and auditory monitoring features of the Dance-the-Music 3.4.1 Visual monitoring The contents of the basic step models can be visually displayed (see Figure 9) as a kind of dynamic and real-time ... are using the visual monitoring aid, they can make the orientation of the movement patterns of the basic step model displayed in each window dependable on their own rotation at the beginning of...

Ngày tải lên: 21/06/2014, 19:20

... EM MODELLING OF PERIODIC STRUCTURES USING GREEN’S FUNCTIONS ZHANG HONGXUAN (B.S., Tianjin University) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING DEPARTMENT OF ELECTRICAL AND ... direction of incident electric field lies in the 34 plane of incident waves; similarly for perpendicular polarization, the direction of incident electric field is normal to the plane of incident waves ... system of Helmholtz equations which are coupled through the interface conditions This coupled system of Helmholtz equations can be reformulated using the vector form of the Helmholtz-Kirchoff integral...

Ngày tải lên: 05/10/2015, 19:05

... index of ith storey, Ki, K*i is the contribution of the ith storey on the global stiffness matrix of the undamaged and damaged structure respectively, and NL is the number of elements of the structures ... stiffnesses at that storey, and the stiffness of each storey of the damaged building can be represented by the product of a damage index and stiffness of each storey of the undamaged building as shown in ... storeys, and the size of wall of the model is 50 cm, cm and 100 cm for the width, thickness and height, respectively It was constructed using concrete of fck = 300 kgf/cm2, and kgf of Copyright © 2004...

Ngày tải lên: 17/06/2016, 14:10

... Basis of Structural Design Actions on structures Design of concrete structures Design of steel structures Design of composite steel and concrete structures Design of timber structures Design of ... of the web Width of a composite slab over which a load is distributed Length of concentrated line load Width of rib of profiled steel sheeting Distance between centres of adjacent ribs of profiled ... value of the plastic resistance of the structural steel section to vertical shear Design value of the resistance of a composite slab to punching shear Design value of the resistance of the composite...

Ngày tải lên: 11/12/2016, 11:56

... thickness of the bottom flange of the steel profile e2 thickness of the upper flange of the steel profile ef thickness of the flange of the steel profile ew thickness of the web of the steel profile ... to the fire design of composite structures The use of lightweight concrete is permitted for composite slabs (16) This part of EN 1994 does not cover the design of composite structures with concrete ... concrete part of a composite slab within the decking h3 thickness of the screed situated on top of the concrete hc depth of the composite column made of a totally encased section, or thickness of the...

Ngày tải lên: 11/12/2016, 12:03

... Eurocode 9: Design of steel structures Design of composite steel and concrete structures Design of timber structures Design of masonry structures Geotechnical design Design of structures for earthquake ... 2005 Eurocode 3: Design of steel structures – Part 1-9: Fatigue strength of steel structures EN 1993-1-11 Eurocode 3: Design of steel structures – Part 1-11: Design of structures with tension ... Effective width of the concrete flange on each side of the web, effective width of composite bottom flange of a box section Width of the flange of a steel section Geometric width of the concrete...

Ngày tải lên: 11/12/2016, 12:04

... (12) Since the Gram matrix is a summation of the contribution of each degree of freedom or sensor location to the mode shape of structural engine health monitoring, maximizing its determinant will ... performance of the above methodology depends on the measurements and, thus, the sensors used for engine health monitoring Determination of the minimum number of sensors is associated with the cost of ... = y + μ, The determinant of Gram matrix can be also expressed in terms of its eigenvalues The issue and the convergence of the global maximization of the eigenvalues of the Gram matrix were explored...

Ngày tải lên: 22/06/2014, 19:20

... published on the use of ultrasonic waves to monitor the setting and hardening process of cementitious materials Some of the techniques rely on the propagation of ultrasonic waves through the specimen ... measurement of C25 unsealed composite specimens 192  Table 5.14 Cracks width measurement of C45 sealed composite specimens 192  Table 5.15 Cracks width measurement of C45 unsealed composite ... change in velocity of the cement paste at an early age Further study by Reinhardt and Grosse (1996) proposed an ultrasonic device capable of monitoring the development of ultrasonic wave velocity...

Ngày tải lên: 10/09/2015, 15:52

... 10.1002/rcm Monitoring of organic chemical reactions using EESI-MS Figure Mass spectra of the Michael addition reaction recorded at 20, 60 and 300 min, respectively Inserts: molecular structures of PEA, ... 2008; 22: 2993–2998 DOI: 10.1002/rcm Monitoring of organic chemical reactions using EESI-MS 2997 Figure Collision-induced dissociation spectra of some [MþH]þ ions of products and intermediates from ... suggested endpoint of the reaction might originate from the differences in the laboratory environments This validates the suitability of EESI-MS for the real-time, on-line monitoring of chemical reactions...

Ngày tải lên: 14/02/2014, 08:20

... Fabrication of high-aspect-ratio micro structures using 21 (HARM) for a variety of MEMS applications Modifications and/or improvements of the UV lithography system and processing ... Fabrication of high-aspect-ratio micro structures using 25 The SU8 mold was then removed by heating in PG Remover in 10hrs Fig illustrates the SEM image of nickel comb structure with the figures of 50µm ... Nguyen Phu Thuy nickel sulfamate electrolyte The value of applied current density was in the range of 1-10ASD Temperature of 52oC and pressure of 4Kg/cm2 would help to make a better interface between...

Ngày tải lên: 05/03/2014, 14:20

... An example of a dialogue with speech acts In this paper, we propose a dialogue analysis model to determine both the speech acts of utterances and the discourse structure of a dialogue using maximum ... probability corpus Table shows the distribution of speech acts in the tagged dialogue corpus Discourse structures are determined by focusing on the subject of current dialogue and are hierarchically ... sequence of utterances U1,U2, ,Ui We can approximate the probability P(Si I Ul.i) by the product of the sentential Speech act analysis model Let UI,, denote a dialogue which consists of a sequence of...

Ngày tải lên: 17/03/2014, 07:20

... Kostanjsek N, Ruof J: Content comparison of health- related quality of life instruments for COPD Respir Med 2007, 101:1113-1122 Cieza A, Stucki G: Content comparison of health- related quality of life ... Classification of Functioning, Disability and Health (ICF) Disabil Rehabil 2003, 25:577-587 World Health Organization: International Classification of Functioning, Disability and Health Geneva: World Health ... L: Measuring the impact and distress of health problems from the individual's perspective: development of the Perceived Impact of Problem Profile (PIPP) Health Qual Life Outcomes 2006, 4:36 Sandström...

Ngày tải lên: 18/06/2014, 19:20

... measurement of healthrelated quality of life The EuroQol Group Health Policy 1990, 16:199-208 Brooks R: EuroQol: the current state of play Health Policy 1996, 37:53-72 Cramer JA, Spilker B: Quality of ... Public Health; France: Committee of the CNIL - Commission Nationale Informatique et Libertés; Germany: Ethics Committee of the University of Leipzig; Italy: Italian National Institute of Health; ... years of education, employment status and the number of persons living in the household About 20% of the individuals had missing values in any of the summands Missing data were imputed by means of...

Ngày tải lên: 20/06/2014, 15:20

... deposition of the TiN film Carvalho et al [26] has suggested that they consist of softer a-Ti phase and a rim of a TiN layer formed by diffusion of N into the a-Ti A nonhomogenous diffusion of reactive ... the ultrasonic excitation amplitude, x the ultrasonic frequency, Tult the ultrasonic time period, heq corresponds to the quasi-static equilibrium position reached by the tip in the presence of ultrasonic ... ultrasonic vibration Fult is responsible of the ultrasonic deflection (or UFM response) of the cantilever In the presence of ultrasound, due to the nonlinearity of the tip-sample force, the tip moves...

Ngày tải lên: 22/06/2014, 00:20

... formation of tapered subwavelength antireflection structures after RIE 123 366 Thermal dewetting occurs due to the increased surface energy of the metal film by heating When the surface energy of the ... result for 110 s and the sidewall of tapered SAS is roughened The reason for the reduced heights is that the tips of the structures are etched faster than the bottom of the structure when the nanodot ... image of the angled view of the tapered SAS array fabricated in the large area is shown Since the tapered sidewall and height of SAS decide antireflective property, not only the formation of nanodot...

Ngày tải lên: 22/06/2014, 01:20

... of mechanics for using composite materials in the design and analysis of composite structures and products In Chapter 1, the text acquaints the reader with the description of a composite material, ... Material Structures 6.1 Introduction 6.2 Theorem of Minimum Potential Energy 6.3 Analysis of a Beam Using the Theorem of Minimum Potential Energy 6.4 Use of Minimum Potential Energy for Designing a Composite ... Forced-Vibration Response of a Composite Material Plate Subjected to a Dynamic Lateral Load 3.18 Buckling of a Rectangular Composite Material Plate – Classical Theory 3.19 Buckling of a Composite Material...

Ngày tải lên: 10/08/2014, 12:21

... International Journal of Solids & Structures Journal of Applied Mechanics Journal of Applied Polymer Science Journal of Composite Materials Journal of Composite Technology & Research Journal of Composites ... Composite Structures Composites Composites & Adhesives Composites Design & Application Composites Fabrication Composites Manufacturing Composites Science and Technology Composites Technology Composites ... of Sandwich Structures and Materials Journal of Sound and Vibration Journal of Testing and Evaluation Journal of Thermoplastic Composite Materials Mechanics of Composite Materials Mechanics of...

Ngày tải lên: 10/08/2014, 12:21

... practical composite material structures are thin in the thickness direction because the superior material properties of composites permit the use of thin walled structures Many polymeric matrix composites ... constitutive equations for one lamina of a composite material were formulated Many structures of composite materials including sandwich structures are composed of numerous laminae, which are bonded ... fraction of the matrix, and and are the respective densities: For determining the composite elastic constants for short fiber composites, hybrid composites, textile composites, and very flexible composites,...

Ngày tải lên: 10/08/2014, 12:21

... solution of isotropic plate problems [4] Aware of all of the above, and based upon the fact that the solution of the second case of the Levy solution of (3.52) has the same form as that of the ... Given an angle-ply construction of five plies of the same composite material oriented as each of equal thickness, which elements of the [A], [B] and [D] matrices of Equation (2.66) will be equal ... laminate where is 33% of the value of at the same location This example was the work of Wenn-Jinn Liou, a student at the University of Florida 102 3.7 Levy Solution for Plates of Composite Materials...

Ngày tải lên: 10/08/2014, 12:21

... strength-critical structures Vibration Damping Damping of composite structures is clearly beyond the scope of this basic textbook However, it would be a mistake not to mention that composite structures ... the use of Equation (3.105) Of course, 3.14 Dynamic Effects on Panels of Composite Materials Seldom in real life is a structure subjected only to static loads More often products and structures ... with increased values of m and n, i.e., with the increased ratio of plate thickness to the wavelength of the m-nth mode of vibration One major reference on the free vibrations of rectangular isotropic...

Ngày tải lên: 10/08/2014, 12:21