Nonlinear acoustic technologies detects
visible and hidden cracks and defects
Nondestructive testing using non linear acoustics.
You can hear nonlinear acoustic effects by tapping a cracked crystal glass. A pure uncomplicated tone is heard in a fresh non broken glass and a cracked damaged glass gives a broken complicated tone clearly stating something is wrong. This distorted sound is the nonlinear acoustic effect caused by damages.
NAW®-inspection technology. "Hammering" a defect such as a crack in a material with our transmitted sound pulses these transmitted sound pulses starts bouncing around in cracks, rifts and gaps causing a noise we can detect with our equipment. Cracks and other defects will change the transmitted sound pulses in a nonlinear way making defects detectable. When analyzing the resulting sound signature our inspection equipment will analyze the level of imperfections in the inspected object, we label this "Damagevalue". Depending on material properties different materials allows sound pulses to be transported different.
As the sound pulses travels through the objects structure complex geometries are not an issue. A drilled hole will "guide" the transmitted sound pulses around the hole circumference. The behaviour of a crack is nonlinear while a hole without cracks is not. A crack will be visible to NAW-inspection but the hole will not show since a hole is not a defect. Non linear acoustics enables easy and fast inspection of details regardless complex geometries.
Inspection for industrial use. NAW-inspection enables inspection of any solid material that carries sound pulses. Inspection of steel beams, casted stainless steel, plastic, cast iron, laser welds, but and joint welds, glass, laminated metals, laminated plastics like carbon reinforced plastics and even rubber are some examples of materials we currently inspect. Inspection time can be optimized down to just a few seconds for highly automated applications. The inspection method is operator independent as the "damagevalue" is calculated in the equipment.
Application example : NAW-Inspection of railway Manganese crossing
Railway crossings exposed to intense traffic needs to withstand wear and are manufactured in steel with high managanese content. The grain size in manganese steel makes conventional ultrasonic inspection difficult or even impossible. This work displays the success using NAW®-inspection detecting status and damages in manganese crossing ....
Application example : NAW-Inspection of Turbine blades
Turbine blades are exposed to stresses such as vibrations, pressure variations, temperatures and more. Inspeting turbine blades is challenging and by utilizing NAW®-inspection we can detect damages. A damage starts as rifts in the materials grain structure .... READ MORE about NAW-inspection of Turbine blades:
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