منابع مشابه
Damage Assessment of Reinforced Concrete Using Ultrasonic Wave Propagation and Pattern Recognition
Many approaches for structural health monitoring have been proposed for the purpose of maintenance cost reduction or performance guarantee of civil and building structures. Development of an active sensing diagnostic technique is needed to predict the location of structural damage during the maintenance. Although reinforced concrete has been used for many structures, damage assessment methods c...
متن کاملAn experimental evaluation of two effective medium theories for ultrasonic wave propagation in concrete.
This study compares ultrasonic wave propagation modeling and experimental data in concrete. As a consequence of its composition and manufacturing process, this material has a high elastic scattering (sand and aggregates) and air (microcracks and porosities) content. The behavior of the "Waterman-Truell" and "Generalized Self Consistent Method" dynamic homogenization models are analyzed in the c...
متن کاملModel-Based Control of Travelling Wave Type Ultrasonic Motors
Abstract. This paper gives a review of research activities at the Institute for Power Electronics and Electrical Drives in Paderborn to the control of rotary travelling wave type ultrasonic motors. Based on a special designed hardware environment an advanced control scheme for inverter-fed travelling wave type ultrasonic motors is presented. After several modelling steps, including an averaged ...
متن کاملDetermination of Early Age Mortar and Concrete Strength by Ultrasonic Wave Reflections
The in-situ testing of early age concrete strength is crucial for determining the time of form removal from concrete elements, opening highways to traffic or applying of prestress to steel reinforcement. A nondestructive ultrasonic technique, which measures the reflection loss of ultrasonic transverse waves at a concrete-steel interface, is presented in this paper. The focus is to compare wave ...
متن کاملNondestructive measurement of concrete strength gain by an ultrasonic wave reflection method
A one-sided, nondestructive, ultrasonic technique for monitoring the setting and hardening process of concrete has recently been developed. The technique is based on monitoring the reflection coefficient of ultrasonic transverse waves at the surface of a laboratory scale hardening concrete in steel molds. The technique has been shown to reliably estimate the rate of strength gain of concrete un...
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ژورنال
عنوان ژورنال: Science & Technique
سال: 2017
ISSN: 2414-0392,2227-1031
DOI: 10.21122/2227-1031-2017-16-4-289-297