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59 results about "Absolute maximum" patented technology

Definition of absolute maximum. mathematics. : the largest value that a mathematical function can have over its entire curve (see curve entry 3 sense 5a) The absolute maximum on the graph occurs at x = d, and the absolute minimum of the graph occurs at x = a.— W. Michael Kelley, The Complete Idiots Guide To Calculus, 2002 — compare maximum sense 3b.

Method for automatically detecting free vibration response of high-speed railway bridge to recognize mode

The invention belongs to the technical field of structure health monitoring and provides a method for automatically testing the free vibration response data segment after a train passes a high-speed railway bridge. Firstly, to-be-analyzed test response is determined according to the maximum value of the time point where the absolute maximum value of each test point vibration response vector is located; then single frequency modal response is extracted from the test response by using iterative variation mode analysis, the envelope amplitude of the modal response is fit by using the Hilbert transform; finally, the vibration characteristic at each time point is marked as attenuation vibration or non-attenuation vibration according to the single frequency free vibration amplitude attenuation characteristic, and a longest structural response data segment meeting the attenuation vibration requirement is taken as detection free vibration response to be applied to mode recognition. According to the method for automatically detecting the free vibration response of the high-speed railway bridge to recognize the mode, effective detection of the free vibration data segment without human participation can be realized, and the method has important signification to real-time accurate mode analysis of the high-speed railway bridge.
Owner:DALIAN UNIV OF TECH

Method and apparatus for optically measuring by interferometry the thickness of an object

Methods and apparatuses are used for optically measuring by interferometry the thickness (T) of an object (2) such as a slice of semiconductor material. Readings of the object thickness by optical interferometry are carried out, rough thickness values (RTW) are obtained and frequencies, indicating how often the rough thickness values occur, are evaluated. A limited set of adjacent rough thickness values whose frequency integration or summation represents an absolute maximum is identified, and the actual value of the thickness of the object is determined as a function of the rough thickness values belonging to said limited set of values. The rough thickness values can be divided up into classes (C) with corresponding frequencies (F), and in this case, a preponderant group (Gmax) of thickness classes is identified as the above-mentioned limited set of adjacent rough thickness. A lower reject threshold (Rmin) and a higher reject threshold (Rmax) that define a searching interval including the actual value of the object thickness are also determined, and all the rough thickness values that are outside the searching interval are eliminated from further processing. When measuring the object during a surface machining, the reject thresholds are progressively and automatically updated as a function of a gradual thickness reduction that the object undergoes.
Owner:MARPOSS SPA
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