Methods for noninvasive determination of acoustical properties of flowing in pipes having a large ratio (>10) of pipe diameter to wall thickness, and in highly attenuating fluids are described. When vibrations are excited on the outer surface of the wall of a pipe, the resulting vibrations propagate directly through the wall in a normal direction and through the pipe wall as guided waves, appearing on the opposite side of the pipe. This dual path propagation through pipes, where guided waves take the circumferential path in the wall of the pipe and may interfere with the time of-flight measurement obtained from the direct path through the fluid, is at least in part resolved by subtracting the signal from the guided wave from the combined signal, thereby permitting improved observation of the direct path propagation through the fluid.

The present disclosure discloses a temperature-controllable large-size geotechnique true triaxial multi-field coupling test system and a test method. The system includes a host loading mechanism, a deformable large-size soil box, an independent three-dimensional loading unit, a refrigeration, water and salt supplementation unit, and a soil-water-ice-salt change monitoring unit. The deformable large-size soil box is arranged on the host loading mechanism. In combination with the special structural design, monitoring is carried out by dividing a large-size soil test sample into environmental soil and a core soil region to eliminate the size effect of the test. The solution can simulate a three-dimensional stress state of the soil test sample in a three-dimensional open system. In consideration of the evolution of hydrothermal salt and three-dimensional migration of temperature, water, salt, etc. between the soil and the environment, temperature-water-salt-stress-strain multi-field coupling is realized.

The present disclosure discloses a temperature-controllable large-size geotechnique true triaxial multi-field coupling test system and a test method. The system includes a host loading mechanism, a deformable large-size soil box, an independent three-dimensional loading unit, a refrigeration, water and salt supplementation unit, and a soil-water-ice-salt change monitoring unit. The deformable large-size soil box is arranged on the host loading mechanism. In combination with the special structural design, monitoring is carried out by dividing a large-size soil test sample into environmental soil and a core soil region to eliminate the size effect of the test. The solution can simulate a three-dimensional stress state of the soil test sample in a three-dimensional open system. In consideration of the evolution of hydrothermal salt and three-dimensional migration of temperature, water, salt, etc. between the soil and the environment, temperature-water-salt-stress-strain multi-field coupling is realized.

A monitoring system of the integrity of a pressurised pipe by at least one pressure pulses generator that is hydraulically connected to the fluid in the pipe. Each generator comprises: one first tank and a second tank that maintain the fluid respectively at a first and a second pressure values. The first value is smaller, and the second value is greater than the predefined pressure value of the fluid in the pipe. The first and second tanks generate respectively a negative pressure pulse, caused by the passage of the fluid from the pipe to the first tank, and a positive pressure pulse, caused by the passage of the fluid from the second tank to the pipe. A pressure transducer is designed to measure the pressure values of the fluid in the pipe and to convert the negative or positive pressure pulses generate by the generator into respective recorded acoustic signals. A measurement station is placed along the pipe to detect the acoustic signals.

A description is given of a system and a method of monitoring of a pipe for the transportation of a fluid at a predefined pressure value. The system comprises at least one pressure pulses generator device hydraulically connected to the fluid transported by the pipe. Each pressure pulses generator device comprises at least one first tank, designed to contain fluid coming from the pipe and to maintain it at a first pressure value which is smaller than the predefined pressure of the fluid transported by the pipe, and at least one second tank, designed to contain fluid coming from the pipe and to maintain it at a second pressure value which is greater than the predefined pressure value of the fluid transported by the pipe. The first tank and the second tank generate respectively a negative pressure pulse, caused by the passage of fluid from the pipe to the first tank, and a positive pressure pulse, caused by the passage of fluid from the second tank to the pipe. Each pressure pulses generator device comprises at least one pressure transducer designed to detect the pressure values of the fluid and to convert them into respective acoustic signals. The system comprises moreover at least one measurement station placed along the pipe and provided with one or more vibroacoustic sensors configured to detect the acoustic signals received from the pressure pulses generator devices.

The invention relates to a system which provides a real time update on an estimated positioning of an ultrasonic which is having an ultrasonic generator placed near the inspection probe in the 3D surface, which generates an ultrasonic guided wave travelling along the surface of 3D component and includes positioning more than one ultrasonic receiver probes along the length of 3D component.

Methods for noninvasive determination of acoustical properties of flowing in pipes having a large ratio (>10) of pipe diameter to wall thickness, and in highly attenuating fluids are described. When vibrations are excited on the outer surface of the wall of a pipe, the resulting vibrations propagate directly through the wall In a normal direction and through the pipe wall as guided waves, appearing on the opposite side of the pipe. This dual path propagation through pipes, where guided waves take the circumferential path in the wall of the pipe and may interfere with the time of-flight measurement obtained from the direct path through the fluid, is at least In part resolved by subtracting the signal from the guided wave from the combined signal, thereby permitting improved observation of the direct path propagation through the fluid.