In some nuclear reactors or accelerator-driven systems (ADS) the core is intended to be cooled by means of a heavy liquid metal, for example, lead-bismuth (Pb/Bi) eutectic alloy. For safety and licensing reasons, an imaging method interior ADS, based on application ultrasonic waves, has thus developed. This paper devoted description developed various transducers suitable long term measurements in Pb/Bi The results comparative experimental investigations different designs alloy up 450 degrees...

The delay time estimation using zero-crossing technique is widely used in ultrasonic measurements. measurements of the phase velocity guided waves are more complicated due to dispersion. Application for velocities changes waveform signals and limited ranges base. objective work presented was investigate details influence different parameters zero – crossing on measurement A 0 mode Lamb waves. Using obtained from finite element modelling a 2 mm thickness aluminium plate it demonstrated that...

Multi-wire ropes are widely used as load-carrying constructional elements in bridges, cranes, elevators, etc. Structural integrity of such can be inspected by using non-destructive ultrasonic techniques. The objective this work was to investigate propagation guided waves (UGW) along composite multi-wire the cases various types acoustic contacts between neighboring wires and plastic core. modes UGW propagating were identified modelling, dispersion curves calculated analytical semi-analytical...

In this paper two techniques: the zero-crossing and spectrum decomposition are implemented together to obtain guided waves phase velocity their dispersion properties. This proposed hybrid technique has been investigated in different mediums: an homogenous using signals by 2D finite element modeling experimental investigation a non-homogenous environment 3D model. The results compared with those obtained semi-analytical method (SAFE). It was demonstrated that case of correctly selected...

Hidden corrosion defects can lead to dangerous accidents such as leakage of toxic materials causing extreme environmental and economic consequences. Ultrasonic guided waves showed good potential detecting distributed in pipeline networks at sufficiently large distances. To simplify signal analysis, traditional wave methods use low frequencies where only fundamental modes exist; hence, the small, localized are usually barely detectable. Novel techniques frequently higher order that propagate...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Metallic foams are prospective materials for use in the aerospace and automotive industry crash energy absorption safety parts or lightweight constructions. During manufacturing, artifacts foamable precursor material quality variations can influence foam structure after foaming process; thus, such a process requires control. The advantage of ultrasonic techniques is possibility to perform...

The aim of this work is to achieve reliable nondestructive evaluation (NDE) adhesively bonded aerospace components by developing novel multidimensional data fusion techniques, which would combine the information obtained ultrasonic and X-ray NDE methods. Separately, both techniques have their advantages limitations. integration from pulse echo immersion ultrasound testing radiography holds immense potential help improve reliability non-destructive evaluation. In study, distinctive features...

This paper is devoted to the development of high temperature, gamma, and neutron radiation resistant ultrasonic sensors that must operate continuously in a liquid Pb/Bi alloy up temperature 450 degC. The main problems are acoustic coupling piezoelectric element protector wetting sensor by heavy metal. piezoelement was attached body gold diffusion bonding process, monitored ultrasonically. Long-lasting active surface achieved coating front face with protective diamond-like carbon (DLC) layer....

Ultrasonic waveguide sensor for measurement of viscosity highly viscous fluids has been developed. The principle is based on application guided shear-horizontal SH0 mode the Lamb waves propagating in an aluminium planar immersed a liquid. Attenuation wave depends surrounding liquid and used estimation. developed mechanically robust may be in-line process control liquids.

An ultrasonic technique, invariant to temperature changes, for a density measurement of different liquids under in situ extreme conditions is presented. The influence geometry and material parameters the system (transducer, waveguide, matching layer) on accuracy reliability analyzed theoretically along with experimental results. proposed method based amplitude wave, reflected from interface solid/liquid medium investigation. In order enhance sensitivity, use quarter wavelength acoustic layer...

Fiber-reinforced composite laminates are being increasingly used in various engineering components the sectors of aerospace and green energy. Due to impacts throughout service life structure, matrix breakage delaminations significantly altering structural integrity laminate can occur. Hence, robust guided wave health monitoring systems required ensure continuous safety structures. In this paper, ultrasonic method based on analysis A0 mode reflecting within defected area has been proposed...

According to the statistics, 40% of unplanned disruptions in electricity distribution grids are caused by failure equipment high voltage (HV) transformer substations. These damages most cases partial discharge (PD) phenomenon which progressively leads false operation equipment. The detection and localization PD at early stage can significantly reduce repair maintenance expenses HV assets. In this paper, a non-invasive solution has been proposed, uses three ultrasonic sensors arranged an L...

Multi-layered composite materials are being used in various engineering fields, such as aerospace, automobile, and wind energy, because of their superior material properties. Due to impact loads during the service life structures, different types defects can occur, matrix cracking, fiber breakage, delaminations, etc. In this research, a novel SHM technique for delamination detection localization using minimum number sensors is proposed. The analytical, numerical, experimental analysis GW was...