Non-Destructive Test

Analyze

How NDT-RAM works

The result is a Response Frequency Spectrum that is unique to your part. Using this spectrum, we can look for changes in your parts.

The principal properties of an object are:
· Mass
· Stiffness
· Damping

If the Mass, Stiffness, or Damping in a component are varied, the response characteristics of an impact will vary.

How Does NDT-RAM Work?

Zooming-In on a single range -- It's Easy to See the Differences

This is an example of a typical Frequency Shift. This shift is typical from 50-500 Hz. The Green block represents the Pass/Fail criterion (or limit).

If the peak is inside the block, the part passes and is ready for the next process.

This is an example of the absence of or the significant difference in the amplitude of a peak. The defect caused the part to dampen faster and not hold its tone.

Example of Decay Rate in Time Domain

This is the response time waveform. Notice how the bad part's (red) resonant response decays!

Operation

Once the Pass/Fail criteria have been set for a given part, the NDT-RAM application can be brought online. Parts can be tested in just a few seconds, and the system can be entirely automated, allowing the inspection of 100% of your high volume production line parts.

A record of every tested part is automatically stored in report form for each different part. This allows the ability to perform statistical analysis on lots, shifts, percent and type of defects.

Example Test

Sometimes it is necessary to have more than one Pass/Fail criterion. Below is an example of a part that requires Four points be checked to determine a good part from a defective part. In this test, all four points must be good for the part to pass.

Blue passed all Four limits -- Good
Pink failed Three of Four Limits -- Defective

• Overview
• Principles
• Equipment
• Advantages

• Powdered Metal Example Application

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