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This paper presents a new method to monitor the micro-stamping procedures by collecting the acoustic vibration signals via low-cost MEMS microphones. A MEMS microphone is directly mounted on the punching mold for detecting the acoustic signals of the stamping procedure. The small stamping signals are conducted via the metal molds such that the levels for signal attenuation and background noise can...
The main problem among the developing of the thickness mode piezoelectric air-coupled ultrasonic transducer is the acoustic impedance mismatch between piezoelectric plate and air. To solve this problem, a kind of porous composite material is introduced as the matching layer. The acoustic parameters measurement methods of the hollow glass microspheres filled epoxy resin composite material is studied...
Voice conversion (VC) using artificial neural networks (ANNs) has shown its capability to produce better sound quality of the converted speech than that using Gaussian mixture model (GMM). Although ANN-based VC works reasonably well, there is still room for further improvement. One of the promising ways is to adopt the successful techniques in statistical model-based parameter generation (SMPG), such...
A complete emotional expression in natural face-to-face conversation typically contains a complex temporal course. In this paper, we propose a temporal course modeling-based error weighted cross-correlation model (TCM-EWCCM) for speech emotion recognition. In TCM-EWCCM, a TCM-based cross-correlation model (CCM) is first used to not only model the temporal evolution of the extracted acoustic and prosodie...
A dynamic photoelastic imaging system is presented and employed to study the directivity of ultrasonic scattering field. Focusing on the cylindrical cavity, photoelastic photograph displays the scattering field, and the directivity patterns of different distances can be plotted by the gray level per pixel. Compared with the simulation results by finite element method (FEM), dynamic photoelastic technique...
The non-collinear mixing method for detection of plastic zone at crack tip is studied in this paper. When stress loaded on crack in solid is more than critical stress, which is related to length of crack, the crack will happen to expend fast leading to material fracture. However, critical stress of crack is affected by plastic zone existence at crack tip, so detection of plastic zone at crack tip...
In order to improve the performance of underwater target surveillance in the areas of marine environment monitoring, time reversal method processing depending on the normal mode model is applied. In order to evaluate this algorithm, lots of numerical simulations in different conditions are implemented and the results could be explained by the normal mode model according to the sound intensity distribution...
Carbendazim is a fungicide with a high level of consumption worldwide. As an estrogenic disrupter, carbendazim is hazardous to humans and animals. In this study, we investigated the potential degradation of carbendazim in aqueous solution by ozonation (O3) combined with sonolysis (ultrasound, US) in laboratory-scale experiments. The results showed that degradation of this fungicide could be conducted...
For the efficient long-range non-destructive health examination of pipes, ultrasonic guided wave NDT has been widely used. The objective of the research presented is to investigate the feasibility of detecting defect in high-pressure pipe using ultrasonic guided wave NDT technology based on magnetostrictive effect. Both theoretical calculation and experimental analysis for one standard pipe are carried...
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