EddySonix® ARI Machines

Acoustic Resonant Inspection is a nondestructive testing technique based on modal or vibration analysis of parts. In this method, structural dynamic features of parts such as natural frequencies and damping factors are analyzed. These features are directly correlated with mechanical properties (such as Elastic Modulus or tensile strength). A structural defect changes the mechanical properties and hence reduces some of the natural frequencies and increases the damping factors. For example, a crack reduces some resonant frequencies and increases the damping ratio. By analyzing and comparing the parameters of “Good” and “Defective” parts, we can detect defective parts.

How EddySonix® ARI Works?

Acoustic Resonant Inspection (ARI) typically involves using an impact device and a microphone to excite and detect resonant frequencies in a material. Here’s how it works:

Impact device: The first step in ARI is to apply a small, controlled impact to the surface of the inspected material. This impact produces a series of high-frequency sound waves that propagate through the material.

Microphone: A sensitive microphone is placed on the material’s surface to detect these resonant frequencies. The microphone picks up the sound waves reflected or scattered back from the material, including the resonant frequencies.

Analysis: The signals from the microphone are then analyzed to identify the resonant frequencies and any changes or anomalies in the material that may indicate the presence of a flaw.

EddySonix ARI Machines

Crack detection of Steering Yokes after friction welding

Detection of defects for Knuckle Arm in Nodularity, Crack, Cold Shot and Dimension

Acoustic Resonant Testing of Brake Caliper Bracket for Nodularity Test and Crack Detection

Acoustic Resonant Testing

The EddySonix ARI Machines can detect various flaws in materials such as metals, composites, and ceramics, including cracks, delaminations, and voids. The technique is particularly effective for detecting minor flaws that may not be visible to the naked eye or detectable by other NDT methods.

Features

Accurate and Repeatable
High Speed Test (1 sec), Easy to Use
Best for high volume 100% quality control
Whole part test for internal and external flaws
Compensation of Production Trends, Temperature, and Mass

No part preparation required, no consumables expenses
Various Tools for Data and Pattern Modeling
Can be Integrated with Eddy Current System
Industrial Computer, Robust against Noise and Dust
Documentation and Statistical Reports

Applications

According to Standard ASTM-E2001, Resonance Testing can be used to detect defects in metallic and non-metallic parts. In a single measurement, the procedure can detect numerous defects including cracks, chips, cold shots, inclusions, voids, oxides, contaminants, missed processes or operations, and variations in dimension, hardness, nodularity, porosity, density, and heat treatment.