To connect renewable energy sources (e.g. solar or wind) on the grid, an inverter or electronic converter is used. However, a traditional inverter has no inertia in the face of frequency changes. Unlike the inertia of...
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Engines operations usually produce intense noise and may cause hearing injuries. Therefore, passive absorbers are being used to reduce or eliminate unwanted noise. However, this mechanism is connected with high costs ...
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ISBN:
(纸本)9781467386456
Engines operations usually produce intense noise and may cause hearing injuries. Therefore, passive absorbers are being used to reduce or eliminate unwanted noise. However, this mechanism is connected with high costs and space requirements. Active Noise Control (ANC) allows to eliminate mentioned drawbacks and therefore offers a better solution. ANC can be designed by feedback, feedforward or hybrid algorithm. Hybrid algorithm has an average settling time, but allows a good response in presence of disturbances. In this paper a fair noise reduction is shown for the use case where an identification process is being made inside of the main hybrid control algorithm loop (online).
Ventilation systems are used in order to provide an appropriate temperature inside buildings. For this reason, convection heat transfer is achieved by fans and extractors to produce wind flows. Nevertheless, fans are ...
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ISBN:
(纸本)9781941763292
Ventilation systems are used in order to provide an appropriate temperature inside buildings. For this reason, convection heat transfer is achieved by fans and extractors to produce wind flows. Nevertheless, fans are loud in operation, therefore passive or active mechanisms are used to reduce the noise level inside buildings. However, passive mechanisms are costly and need big space to be fixed around the ventilation system to absorb noise compared to Active Noise Control (ANC). ANC systems are being employed to avoid big costs and space requirements. Accordingly, strategies and algorithms for active noise reduction were analyzed, implemented and tested experimentally in this paper for applications in duct ventilation systems. Algorithms implemented were simulated by Matlab software. Piezo actuator was utilized as an active element of ANC system during experimental testings.
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