A generic approach to the placement of a binaural sensor on a humanoid robot head is proposed in order to improve sound localization. After a brief description of binaural and spectral cues, the method is first illustrated on the well-known head spherical approximation, which response can be described analytically. Then, a simplified CAD model of a mannequin is considered. It is argued that recent developments on analytical expansions of HRTFs can help to get a solution even from a limited set of simulated head responses. The obtained conclusions noticeably comply with some antropomorphic statistics.
In this work, we developed two acoustic devices to study both critical phases in wheat dough processing: the kneading phase and the fermentation one. The ultrasonic sensor in the kneading phase plays the role of a microphone integrated in the mixer. This sensor represents the mechanical development of the dough in kneading by a curve with critical point. While, in the fermentation phase, the paste is subjected to an acoustic vibration. This technique uses a mechanical pulse emitter and a low-frequency broadband acoustic receiver. The experimental set up shown here is able to monitor in situ the evolution of the physical properties of the matter in kneading and fermentation phases. These techniques enable the dough evolution kinetic assessment with varying additive elements and technological parameters.
A low-frequency acoustic method was implemented for the purpose of nondestructive control and evaluation of metal plates coating. In this method, a mechanical pulse (acoustic impact) is used to generate acoustic vibrations on a frequency band between 100 Hz to 20 kHz, and a compact acoustic sensor, constructed with by composite materials with an embedded ferroelectric disk, is used to receive the acoustic vibrations. The technique consists in setting in resonance the integrality of a reduced size mechanical structure. The modal frequencies of plates are calculated by two methods: analytically and by finite element method. Then, a numerical modeling of the acoustic behaviour of the sensor is presented. Finally, experimental trials are described and results showing the sensitivity of the method to evaluate coating of metal plates are analyzed.
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