Boots – shoes – and leggings
Patent
1990-04-13
1990-12-18
Lall, Parshotam S.
Boots, shoes, and leggings
364508, 364552, 73600, 73602, G01N 2904, G06F 1546
Patent
active
049791257
ABSTRACT:
A non-destructive method for evaluating ropes, cables, and strands for flaws and tension is shown. The method permits detecting flaws by recognizing certain vibrational wave amplitude and distribution patterns resulting from striking a test subject with a transverse force. Tension on a test subject is calculated by measuring propagation velocity of the vibrational waves through the test subject. An apparatus is provided which produces vibrational waves in a test subject, measures the amplitude and time distribution of the waves, and displays the measurements for analysis.
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James Williams et al., "Acoustic-Ultrasonic Nondestructive Evaluation of Double Braided Nylon Ropes Using Stress Wave Factor", Fibre Science & Technology, 21(1984), pp. 169-180.
Herbert Weischedel, "The Inspection of Wire Ropes in Service: A Critical Review", Materials Evaluation, 43 Dec., 1986, pp. 1592-1605.
Burkhardt Gary L.
Kwun Hegeon
Lall Parshotam S.
Mattson Brian M.
Southwest Research Institute
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