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A full-scale load test is made of two Pearl-Chain (PC) concrete arches in order to evaluate the structural response and assess the design safety. Pearl-Chain structures and Pearl-Chain arches are invented and patented at the Technical University of Denmark.PC-Arches consist of specially designed, pre-fabricated, composite, lightweight, concrete deck elements (SL-Decks), that are post-tensioned together...
In this paper we present a tone location system that estimates the frequency of an input tone through additions and comparisons alone. The system uses “cyclotomic” filters (which operate without multiplications), requiring fewer operations than with a conventional Discrete Fourier Transform (DFT) entailing multiplications. In the system presented here, an input tone is first transformed to yield two...
The quality of the ultrasonic shot peening treatment, which consists of projecting spherical beads onto a workpiece using a sonotrode vibrating at 20kHz, is strongly dependent on the impact features. This motion of the beads obviously depends on their quantity, the excitation source, and the materials comprising the chamber. The average depth of impact marks on a copper tube, shot peened in different...
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