Showing papers in "Ultrasonics in 2018"

TL;DR: Techniques that utilise ultrasonic bulk waves to size flaws, including amplitude, temporal, imaging and inversion, are reviewed.

TL;DR: Comparisons of guided wave simulations for CFRP composites implemented using four different simulation codes: the commercial finite element modeling (FEM) packages ABAQUS, ANSYS, and COMSOL, and a custom code executing the Elastodynamic Finite Integration Technique (EFIT).

TL;DR: Investigation of ultrasound treatment applied in osmotic solution on bioactive compounds, such as vitamin C, polyphenols, anthocyanins and flavonoids content as well as antioxidant activity in cranberries indicated that the influence of ultrasound waves on cranberries depends on a type of bioactive component.

TL;DR: The purpose of this study was to investigate the effect of non‐thermal technology, high power ultrasound (HPU) on inactivation of Aspergillus ochraceus 318, Penicillium expansum 565, Rhodotorula sp.

TL;DR: Accuracy of the developed analytical model in interpreting contact crack-induced CAN is demonstrated, and its application to quantitative evaluation of fatigue damage is spotlighted.

TL;DR: The results observed showed that the combination of membrane ultrafiltration with US reduced membrane fouling rates to a greater extent at the higher membrane flux and lower US frequency applied, reaching a reduction of 57.33% at 150 L/m2 h and 35 kHz.

TL;DR: This study considers different shapes of the wave front generated during an acoustic event and develops a methodology to localize the acoustic source in an anisotropic plate from those wave front shapes.

TL;DR: A comprehensive finite element‐based simulation of acoustic separation of platelets, red blood cells and white blood cells, using standing surface acoustic waves (SSAWs) and introduces optimum voltage magnitudes for high separation efficiency.

TL;DR: A sparse representation strategy based on an Symbol‐norm optimization algorithm for guided‐Lamb‐wave‐based inspections and the results indicate a great potential for the proposed sparse representation using a dictionary algorithm, which provides an effective alternative approach for damage detection.

TL;DR: New workflow succeeds in the challenging scenario where the defect lies along preexisting layer interface in a composite bridge deck and in related experiments involving noisy data or inaccurate source parameters, and is shown to be more promising than a single‐step inversion.

TL;DR: The study of the mechanical properties of cracked rock indicates that the stress of dilatancy onset can be as the parameter of strength design in rock engineering, which can effectively prevent the large deformation of rock.

TL;DR: A model is developed to predict tool wear and heat distribution on tool faces in conventional, rotary, and ultrasonic assisted rotary tuning methods and a modified Usui wear rate model, which includes tool clearance angle, is proposed.

TL;DR: A series of pilot scale test indicated that the oil removal rate could be 82–90% by ultrasound assistant with surfactants (Span 80), and Thin‐layer chromatographic flame ionization detection showed that the removal rate by ultrasonic wash was dropped with the increase of composition polarity.

TL;DR: The data suggest that the geometric parameters of ultrasound systems can have strong influence on the efficiency of ultrasonic enhancement of NaCl uptake in meat and can be a crucial element in determining salt uptake during meat processing.

TL;DR: A robust SMSF (RSMSF) is developed by extending the SMSF to the spatial frequency domain using an altered spectrum of the aperture data and a square neighborhood average is applied on the RSMSF to offer a more smoothed square neighborhood RS MSF (SN‐RS MSF) value.

TL;DR: A new sensor cluster orientation is proposed to localize an acoustic source in a plate from the time difference of arrival (TDOA) with the help of only four to eight sensors, reducing the number of sensors required for acoustic source localization in an anisotropic plate.

TL;DR: An improved method to locate and assess damages in composite structure using broadband Chirp excitation and the pulse compression technique for energy concentration and high‐accuracy distance estimation is established.

TL;DR: By using a 20 MHz IVUS probe with controlled pullback, not only can the internal structure of human arteries be analyzed more accurately, but also segment each frame during the pullback procedure because of the low run time of the proposed segmentation method.

TL;DR: It is shown that an A0‐mode wave can be generated by a pair of S0 and A0 mode waves only when mixing condition is satisfied, and mixing wave signals are capable of locating the damage zone.

TL;DR: The experimental results show that the acoustic nonlinearity parameter is sensitive to early-stage microcrack formation under both loading conditions - the measured β can be directly linked to the accumulated microscale damage.

TL;DR: The surface quality of the drawn wires with ultrasonic vibrations was apparently improved compared with those using conventional method, and the longitudinal and torsional composite vibration was more effective for surface quality improvement than pure longitudinal vibration, however, at the cost of weakened drawing force reduction effect.

TL;DR: The results demonstrate that the flow rate accuracy and the repeatability of the TOF are significantly improved by using averaging reference wave, compared with that using random reference wave.

TL;DR: The stator‐rotor contact mechanism of ultrasonic motors was modeled with the Finite Volume Method and a good agreement between the proposed model results and the torque‐speed characteristic of the USR60 was observed.

TL;DR: It was shown that with the use of the wave from the low frequency regime it was easier to differentiate later stages of the crack development, being in contrary to waves in the high frequency regime, which allowed to clearly observe early stages ofThe damage detection and monitoring scheme in the field of Structural Health Monitoring based on utilising the nonlinear features of guided ultrasonic waves.

TL;DR: By observing the microstructure of material with SEM, it shows that the ultrasonic vibration can promote the generation of deformation twins, causing the grain refinement and the reduction of the twins, which is the major factor of affecting the residual softening effect.

TL;DR: Experimental results indicated that the ultrasonic cavitation processing and Al2O3 nanoparticles play an important role for microstructure refinement.

TL;DR: The obtained results indicate the significant impact of ultrasonic irradiations on the photocatalytic performance of pure anatase form than any other hybrid type of TiO2 nanoparticles.

TL;DR: The ZLCC results were in very good agreement with ultrasonic C‐scan and X‐ray computed tomographic (X‐ray CT) scan results and revealed resonance modes of standing waves within the damaged region.

TL;DR: The results showed that dry matter content and concentration of the dissolved substances increased during ultrasound treatment in osmotic solution, however higher value was observed for treatment in 61.5% sucrose solution and for longer time, while water activity and volume of cranberries did not change after the ultrasonic treatment.

TL;DR: Continuous compressional wave transmission measurements during compaction of unconsolidated quartz sand are used to investigate the impact of soil layer deformation on ultrasonic wave properties and a linear correlation was found between the degree of grain crushing and the changes in the normalized dominant frequency of compressional waves.