منابع مشابه
Asynchronous Ultrasonic Trilateration for Indoor Positioning of Mobile Phones
In this paper we discuss how the innate ability of mobile phone speakers to produce ultrasound can be used for accurate indoor positioning. The frequencies in question are in a range between 20 and 22 KHz, which is high enough to be inaudible by humans but still low enough to be generated by today’s mobile phone sound hardware. Our tests indicate that it is possible to generate the given range ...
متن کاملLow Cost Ultrasonic Positioning System for Mobile Robots
This paper describes a simple low-cost 2D and 3D positioning system for mobile robots. The system makes use of both ultrasound and radio frequency signals to achieve positional accuracies better than 1% of the tracked volume. Furthermore, we have integrated the positioning system into the simulation tools Player/Stage, in order to combine simulated robots with real robots in a ‘hybrid’ embodied...
متن کاملDesign and Fabrication of a Longitudinal-Torsional Ultrasonic Transducer
A hybrid longitudinal-torsional ultrasonic transducer is designed and fabricated in this research. The design of the transducer was performed using the FE method with ABAQUS software, with the aim of combining the longitudinal and torsional vibration modes. The transducer horn is then fabricated using a 4-axis milling machine. The PZT stacks are employed in order to excite the transducer. The t...
متن کاملDesign and Fabrication of a Longitudinal-Torsional Ultrasonic Transducer
A hybrid longitudinal-torsional ultrasonic transducer is designed and fabricated in this research. The design of the transducer was performed using the FE method with ABAQUS software, with the aim of combining the longitudinal and torsional vibration modes. The transducer horn is then fabricated using a 4-axis milling machine. The PZT stacks are employed in order to excite the transducer. The t...
متن کاملImproved Ultrasonic Piezoceramic Sandwich Transducer
This paper presents an improved ultrasonic piezoceramic sandwich transducer, utilised for ultrasonic field in narrow lift stations, wet well, flumes and filter beds. The piezoceramic sandwich transducer powered by a signal generator and it is suitable to generate ultrasound with two piezoceramics and the exponential horn at 35 kHz resonance frequency. From the experiments it can be proved that ...
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ژورنال
عنوان ژورنال: The Journal of Engineering
سال: 2017
ISSN: 2051-3305,2051-3305
DOI: 10.1049/joe.2017.0105