Boots – shoes – and leggings
Patent
1987-06-12
1989-02-14
Lall, Parshotam S.
Boots, shoes, and leggings
364506, 364573, 73146, 73 8, 73462, 324 78D, G06F 1702, G01M 1702
Patent
active
048051250
ABSTRACT:
Apparatus and methods for use in measuring the uniformity of a body such as a tire, wheel or the like wherein a waveform related to the uniformity of the body is digitally sampled to acquire a series of data samples, each of which is correlated with a respective physical location on the body. According to a first aspect of the invention, a non-repetitive error component of the waveform is corrected for by sampling the same location on the body at two different times and determining the difference between the corresponding data samples. A part of the total difference is allocated to each of the data samples in the series according to a predetermined methematical function which at least approximately describes the non-repetitive component of the waveform. The part of the difference allocated to each sample is then subtracted from it to obtain a corrected series of data sample. According to a second aspect of the invention, the maximum, minimum and/or peak-to-peak values of the waveform are more accurately determined by relating selected extreme data samples and one or more data samples adjacent thereto to a polynomial function of at least second order. The function is then evaluated at the location where its first derivative equals zero to determine a more accurate and repeatable approximation of a maximum, minimum or peak-to-peak value of the waveform. According to yet another aspect of the present invention the first and second aspects above are practiced in conjunction with one another.
REFERENCES:
patent: 3490277 (1970-01-01), Sanders et al.
patent: 3719813 (1973-03-01), Friedman et al.
patent: 3780573 (1973-12-01), Reus
patent: 4018087 (1977-04-01), Wenz
patent: 4100795 (1978-07-01), Pangtti
patent: 4327580 (1982-05-01), Suzuki et al.
patent: 4702103 (1987-10-01), Wenz
Eagle-Picher Industries, Inc.
Lall Parshotam S.
Ramirez Ellis B.
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