Nonlinear acoustic NDT method detecting
hidden and visible cracks and defects
Nondestructive testing (NDT) 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.
A buried or surface breaking crack is detected by "provoking" the inspected item with our invented Non-linear Acoustic Waves (NAW® technology). Cracks and other defects will change our transmitted "sound pulses" in a nonlinear way making defects detectable with our inspection system. When analyzing the resulting sound response signature our inspection equipment will calculate a "Damagevalue", a numerical value of the defects severity, higher "Damagevalue" equals a larger crack.
Any material able carrying sound waves can be inspected utilizing NAW®-inspection technology.
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.
NEW Application example : NAW®-inspection of hydropower turbine blades.
The forces and stress on a water power turbine is continuous and relentless, and when needed the most there is no room for stoppage. A waterpower turbine operates in tough conditions and measuring status of all components is a difficult task and Nonlinear acoustic inspection technology NAW® is one available inspection method that can help localizing damages and estimate lifecycle to verify power generation is up to task.
Article: NAW-inspection of highpressure tubeheatexchanger :
"Crack Detection in large tube exchangers"
"Crack Detection in large tube exchangers"
Mixing wrong chemicals in a chemical factory may impose danger. A pressurized tube heat exchanger transferring heat from one chemical to another requires the tube heatexchanger to be perfectly tight during temperature stress to receive expected stabile results. Inspecting a tube heatexchanger with hundreds of welded tubes efficiently for cracks is achieved with Acoustic Agree AB patented NDT method NAW®-inspection. NAW®-inspection enables both detection of cracks not visible in cold state as locating and evaluating damages for repair.
Application example : Forged crankshaft, dragracing car.
A Pro Mod dragracing car produces 3-5000hp to run a quarter mile in 5 seconds. A supercharged 526 cui (8.6 liters) hemi V8 running on methanol puts an enormous stress on the crankshaft transferring all the power from the pistons to the wheels. To handle cost and time in preparing for a 5 second race inspecting state of engine parts such as the crankshaft before a race is essential having the engine in a known good condition. One inspection method to check health of engine parts is NAW®-inspection (Non-linear Acoustic Waves) locating and estimating severity of buried cracks.
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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. Inspecting turbine blades is challenging and by utilizing NAW®-inspection we can detect damages. A damage starts as rifts in the materials grain structure ....
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Acoustic Agree AB
Non destructive testing (NDT) using non linear acoustics.
Järnbruksvägen 7
37252
Kallinge
SE
Phone: +46-709-427-955