Figure 1. We propose a flexible embroidered speaker, which does not require a permanent magnet. By using a 0,15 mm Cu/Ag20 yarn (A), we embroider two flat coils (B) which are placed on top of each other (C). One possible demo application could be an embroidered jacket speaker which can be controlled with a pocket synthesizer (D).
In case of fast running reciprocating compressors an oscillating momentum on the piston has been observed. This oscillation has been attributed to internal waves. The aim of this paper is to present a simple model to show how such waves are initiated.
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