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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.01 vteřin. 
Reverberation Reduction in Transformer-Less Ultrasonic Sensors for Parking Applications
 Ledvina, Jan ; Husák, Miroslav (oponent) ; Štork, Milan (oponent) ; Horský, Pavel (vedoucí práce)
A common feature of modern car is a parking assistant that typically depends on performance of ultrasonic sensors. This doctoral thesis opens question of reverberation reduction in these sensors. Reverberation is unwanted phenomenon that prevents the sensor in short distance ranging, which is crucial in a parking application. The thesis intentionally aims on emerging transformer-less sensor solution. To address the reverberation problem different types of electric damping are studied. From the theory review it became apparent that a combination of multiple damping methods is needed. The proposed practical solution utilizes a nonlinear damping followed by a linear damping. For the linear damping an adaptive shunt tuning method was proposed to address variation in transducer parameters, which enables the system to achieve the fastest damping. To prove viability of this concept a hardware implementing the proposed damping method was developed and using this hardware the methods were evaluated.
Úplný záznam
Reverberation Reduction in Transformer-Less Ultrasonic Sensors for Parking Applications
 Ledvina, Jan ; Husák, Miroslav (oponent) ; Štork, Milan (oponent) ; Horský, Pavel (vedoucí práce)
A common feature of modern car is a parking assistant that typically depends on performance of ultrasonic sensors. This doctoral thesis opens question of reverberation reduction in these sensors. Reverberation is unwanted phenomenon that prevents the sensor in short distance ranging, which is crucial in a parking application. The thesis intentionally aims on emerging transformer-less sensor solution. To address the reverberation problem different types of electric damping are studied. From the theory review it became apparent that a combination of multiple damping methods is needed. The proposed practical solution utilizes a nonlinear damping followed by a linear damping. For the linear damping an adaptive shunt tuning method was proposed to address variation in transducer parameters, which enables the system to achieve the fastest damping. To prove viability of this concept a hardware implementing the proposed damping method was developed and using this hardware the methods were evaluated.
Úplný záznam

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