Method for determining a twist angle
First Claim
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1. A method for determining a first angle between a first shaft section and a second shaft section, the method performed by a computer processor, comprising:
- supplying a first shaft signal by a first 0°
position of a first shaft section;
supplying a second shaft signal by a second 0°
position of a second shaft section;
decomposing the first shaft signal and the second shaft signal into frequency components of harmonic oscillation using Fourier analysis,wherein a first plurality of frequencies is formed for the first shaft signal and a second plurality of frequencies is formed for the second shaft signal, the first and second plurality of frequencies are Banned respectively as complex pointers from an absolute value and a phase of an order, andwherein each pointer describes an angular velocity of the respective frequency;
dividing a plurality of respective angles of the complex pointers by the respective order for the first plurality of frequencies and the second plurality of frequencies;
forming standardized complex pointers; and
adding the standardized complex pointers in a complex manner, so that a first added complex pointer is formed from the first plurality of frequencies and a second added complex pointer is formed from the second plurality of frequencies, a length of the added complex pointers corresponding in each instance to an arithmetic sum of the lengths of the individual complex pointers wherein an angle spanned by the first added complex pointer and the second added complex pointer corresponds to the first angle,wherein the decomposing, dividing, forming and adding are performed by a computer processor.
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Abstract
A method for determining an angle between a first shaft section and a second shaft section is provided. The 0° position of the first shaft section is determined by a first shaft signal, and the 0° position of the second shaft section is determined by a second shaft signal. The first shaft signal and the second shaft signal are subsequently each decomposed using Fourier analysis into frequency components of harmonic oscillations, wherein frequencies are calculated for the first shaft signal, and frequencies are calculated for the second shaft signal. The frequencies are each calculated as complex pointers from absolute value and phase of the order thereof wherein each pointer describes the angular velocity of the particular frequency. For each frequency, the particular angle of the complex number is then divided by the order, wherein standardized complex pointers are calculated. The standardized complex pointers are added complexly.
5 Citations
15 Claims
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1. A method for determining a first angle between a first shaft section and a second shaft section, the method performed by a computer processor, comprising:
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supplying a first shaft signal by a first 0°
position of a first shaft section;supplying a second shaft signal by a second 0°
position of a second shaft section;decomposing the first shaft signal and the second shaft signal into frequency components of harmonic oscillation using Fourier analysis, wherein a first plurality of frequencies is formed for the first shaft signal and a second plurality of frequencies is formed for the second shaft signal, the first and second plurality of frequencies are Banned respectively as complex pointers from an absolute value and a phase of an order, and wherein each pointer describes an angular velocity of the respective frequency; dividing a plurality of respective angles of the complex pointers by the respective order for the first plurality of frequencies and the second plurality of frequencies; forming standardized complex pointers; and adding the standardized complex pointers in a complex manner, so that a first added complex pointer is formed from the first plurality of frequencies and a second added complex pointer is formed from the second plurality of frequencies, a length of the added complex pointers corresponding in each instance to an arithmetic sum of the lengths of the individual complex pointers wherein an angle spanned by the first added complex pointer and the second added complex pointer corresponds to the first angle, wherein the decomposing, dividing, forming and adding are performed by a computer processor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for carrying out a method for determining a first angle between a first shaft section and a second shaft section, comprising:
a means for carrying out the method comprising the steps of; supplying a first shaft signal by a first 0°
position of a first shaft section,supplying a second shaft signal by a second 0°
position of a second shaft section,decomposing the first shaft signal and the second shaft signal into frequency components of harmonic oscillation using Fourier analysis, wherein a first plurality of frequencies is formed for the first shaft signal and a second plurality of frequencies is formed for the second shaft signal, the first and second plurality of frequencies are formed respectively as complex pointers from an absolute value and a phase of an order, and wherein each pointer describes an angular velocity of the respective frequency, dividing a plurality of respective angles of the complex pointers by the respective order for the first plurality of frequencies and the second plurality of frequencies, forming standardized complex pointers, and adding the standardized complex pointers in a complex manner, so that a first added complex pointer is formed from the first plurality of frequencies and a second added complex pointer is formed from the second plurality of frequencies, a length of the added complex pointers corresponding in each instance to an arithmetic sum of the lengths of the individual complex pointers wherein an angle spanned by the first added complex pointer and the second added complex pointer corresponds to the first angle. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
Specification
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Current AssigneeSiemens AG
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Original AssigneeSiemens AG
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InventorsHempl, Martin
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Primary Examiner(s)Kundu, Sujoy
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Application NumberUS12/865,211Publication NumberTime in Patent Office1,399 DaysField of Search702/145, 702/150, 702/151, 701/67, 192/3.3, 477/91, 477/107, 477/110US Class Current702/151CPC Class CodesG01D 5/244 influencing characteristics...
