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This paper presents the latest results from a second harmonic gyro-TWA experiment at Strathclyde University. The experiment uses a helically corrugated interaction region and operates at Ka-band. Simulations have been performed to predict the amplifier gain and bandwidth using linear theory. Amplifier stability margin can be improved with the addition of a sever. A sever has been designed and manufactured,...
Given that the eco-efficiency of industrial processes/plants has become important, engineers need to find a way to integrate control loop configuration and measurements of eco-efficiency. The exergy eco-efficiency factor, a new measure of eco-efficiency for control loop configuration has been developed. The exergy eco-efficiency factor is based on the thermodynamic concept of exergy which can be used...
A porous aluminium plate with a regular columnar microstructure exhibits unusual properties when interacting with high frequency acoustic waves. Finite element modeling reproduces this behaviour and a more detailed analysis explains the underlying physics.
High frequency ultrasonic wave propagation in an immersed porous aluminium sheet is modelled and the results verified by experiment using focused broadband 50, 100 and 175 MHz waves. For colinear (pores extending from face to face of the sheet) samples the microstructure facilitates transmission at angles beyond 35deg, which is far greater than the critical angles for a homogeneous solid, and at a...
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