By Ken Butti
Sm 4to, 1980, PP.289,
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Additional resources for A Golden Thread: 2500 Years of Solar Architecture and Technology
Unfortunately, typical systems do not use an integrated approach to the design, implementation, and operation of the SHM system, resulting in the benefits of the system often not being realized. Too often, a disproportionate emphasis is placed on the collection of data rather than on the management of this data and the use of decision-making tools that would support the ultimate aim of using the collected data to effect better management of the infrastructure system. Typically, systems collect data on a continuous or periodic basis and transmit the data to a common point.
In general, sound waves travel fastest in the fiber direction and slowest in the transverse direction. Attenuation in PMCs is exhibited in a similar manner to sound velocity. Higher attenuation is observed in PMCs than in metals. When choosing AE sensors, preamps, determining sensor spacing and setting data acquisition parameters, these characteristics should be considered. 5 AE detection AE techniques can be used to detect damage and damage growth in PMCs. The region of the damage can also be located by AE techniques such as triangulation and zonal methods.
As mentioned earlier, there are two sets of data that can be obtained from an AE test, AE parameter data and waveform data, and so there are two possible approaches to AE data analysis: AE parameter-based analysis and waveform-based analysis. In the analysis of AE data for NDE of PMCs, the first step is usually analyzing the parameter data because it takes less effort and time, while waveform data is only used when necessary. By examining the waveform features, more information about an individual AE hit may be obtained, which is helpful in identifying the source of the hit and more accurately determining the source location.
A Golden Thread: 2500 Years of Solar Architecture and Technology by Ken Butti