This study aims to implement a system-on-chip (SoC) detection system for tool wear monitoring and alarms high-precision machining processes. The proposed deep learning approach is trained by the collected sensors from real performed in three-axial computer numerical control (CNC) machine center combined with different conditions of spindle speed tightening torque. corresponding vibrational soun...

Localization and characterization of noise and vibration sources through measurement of sound fields radiated from vibrating structures plays an important role in vibration diagnostics. Sound pressure field measured in closed distance to the source with a microphone array is then inversely processed with the suitable near-field acoustic holography method to obtain the estimation of sound field ...

Automated home applications are to ease the use of technology and devices around the house. Most of the electronic devices, like shutters or entertainment products (Hifi, TV and even WiFi), are constantly in a standby mode, where they consume a considerable amount of energy. The standby mode is necessary to react to commands triggered by the user, but the time the device spends in a standby mod...

A free-field (FF) substitution method for calibrating the pressure sensitivity of microphones at frequencies up to 80 kHz is demonstrated with both grazing and normal-incidence geometries. The substitution-based method, as opposed to a simultaneous method, avoids problems associated with the nonuniformity of the sound field and, as applied here, uses a 1/4-in. air-condenser pressure microphone ...

An accelerometer attached to an umbo is proposed as a middle ear microphone for future fully implantable cochlear prostheses. The micromechanic characterization of cadaveric temporal bones indicates that a miniature accelerometer with a sensing resolution of 35 µg/ Hz, a bandwidth of 8 kHz, and a packaged weight less than 20 mg is required for detecting normal conversation, and that the acceler...

A narrowband MEMS direction finding sensor has been developed based on the mechanically coupled ears of the Ormia Ochracea fly. The sensor consists of two wings coupled at the middle and attached to a substrate using two legs. The sensor operates at its bending resonance frequency and has cosine directional characteristics similar to that of a pressure gradient microphone. Thus, the directional...

The need for small directional microphones is patent in the current market. From smartphones to hearing aids, a microphone capable of rejecting ambient noise highly desirable. Most MEMS are omnidirectional and have resort arrays achieve directionality, effectively counteracting reduced size that they offer first place. For this reason, we use bio-inspiration turn nature find examples solutions ...

Non-contact testing is an important method for the study of the vibrating characteristic of cylindrical resonators. For the vibratory cylinder gyroscope excited by piezo-electric electrodes, mode testing of the cylindrical resonator is difficult. In this paper, a novel vibration testing method for cylindrical resonators is proposed. This method uses a MEMS microphone, which has the characterist...