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Noise vibration characteristics frequency amplitude

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noise, vibration characteristics, frequency amplitude, harmonic spectrum, harmonic analysis, sonic emissions, ultrasonic emissions Radioactive signature distribution and diffusion of isotopes and tracers Signal or image analysis image enhancement and quantization; pattern recognition; densitometry; signal classification, separation; and correlation; discontinuity identification, definition (size and shape) and distribution analysis; discontinuity mapping and display
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infrared thermographic techniques, airborne ultrasonic testing and certain techniques of acoustic emission testing. Other less easily classified methods are material identification, vibration analysis and strain gaging. No one nondestructive testing method is all revealing. In some cases, one method or technique may be adequate for testing a specific object or component. However, in most cases, it takes a series of test methods to do a complete nondestructive test of an object or component. For example, if surface cracks must be detected and eliminated and if the object or component is made of ferromagnetic material, then magnetic particle testing would be the appropriate choice. If the material is aluminum or titanium, then the choice would be liquid penetrant or electromagnetic testing. However, if internal discontinuities are to be detected, then ultrasonic testing or radiography would be the selection. The exact technique in each case would depend on the thickness and nature of the material and the types of discontinuities that must be detected. Value of Nondestructive Testing The contribution of nondestructive testing to profits has been acknowledged in the medical field and computer and aerospace industries. However, in industries such as heavy metals, although nondestructive testing may be reluctantly accepted, its contribution to profits may not be obvious to management. Nondestructive testing is sometimes thought of only as a cost item and can be curtailed by industry downsizing. When a company cuts costs, two vulnerable areas are quality and safety. When bidding contract work, companies add profit margin to all cost items, including nondestructive testing, so a profit should be made on the nondestructive testing. The attitude toward nondestructive testing is positive when management understands its value. Nondestructive testing should be used as a control mechanism to ensure that manufacturing processes are within design performance requirements. When used properly, nondestructive testing saves money for the manufacturer. Rather than costing the manufacturer money, nondestructive testing should add profits to the manufacturing process. Overview of Other Nondestructive Testing Methods To optimize the use of nondestructive testing it is necessary first to understand the principles and applications of all the methods. This volume features electromagnetic testing (Fig. 3) — only one of the nondestructive test methods.
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  • Fall '19
  • The Land, Nondestructive testing, electromagnetic testing

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