This paper demonstrates the possibility of executing wide band hard real time application in user space under Linux. Such a possibility is demonstrated through examples of its implementation at DIAPM of three digital active control systems, that require relatively high (up to 12 KHz) control frequencies: an active noise control of an acoustic duct using feed-forward techniques, an application of active… vibration suppression of a plate with piezoelectric materials, and an active noise reduction system used to control combustion instabilities in a Rijke tube.

A brief introduction of the basic ideas on which hard real time control in user space is based, its most recent developments, and a complete description of the software architecture adopted in each application are included.

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