Patent US4024463A successfully refreshed from Google Patents.
Patent US5239137A successfully refreshed from Google Patents.
US5239137A
Expired / Lapsed
US
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Method for calibrating sensors arranged in pairs on loaded structural parts
Assignee: VDO Luftfahrtgerate Werk GmbH
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Filing: 1992-03-19
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Granted: 1993-08-24
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Expires: 2012-03-19
Abstract
Abstract For the calibration of an electronic measurement system with sensors which are arranged in pairs on structural parts of an airplane undercarriage which are loaded transverse to the lengthwise direction and which give off measurement signals which correspond to the vertical displacement between two sensor attachment points which are staggered from each other in the lengthwise direction of the structural parts, the pair of sensors which form a measurement point in each case being arranged approximately in the horizontal central plane of the structural part at positions opposite each other on the outside, a method is proposed in which a separate scaling factor is determined for each sensor of the pair of sensors. For this purpose, the measurement signals and weights are preferably determined for at least two conditions of loading of the airplane which are as far apart as possible and, furthermore, in connection with at least two different torsional conditions of the loaded structural part.
Inventors
- 👤 Hans N. Patzig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:17
CPC Classifications
G; G01; G01G; G01G23/00; G01G23/01; G01G19/00; G01G19/02; G01G19/07
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
150 words
A method of calibrating an electronic measurement system having sensors which are arranged in pairs on structural parts of an aircraft undercarriage which are loaded transverse to a lengthwise direction and which give off measurement signals which correspond to a vertical displacement between two sensor attachment points staggered from each other in the lengthwise direction of the structural parts, the method comprising the steps of: employing each of said sensor pairs for a single measurement point; arranging the sensor pairs approximately in a horizontal center plane of the structural parts on outside positions of the structural parts opposite each other; determining a separate scaling factor for each sensor of said sensor pairs; applying scaling factors to loads measured by respective ones of the sensors to obtain scaled sensor measurements; and summing scaled sensor measurements of the sensors of a sensor pair to obtain a load measure at a measurement point.
Claim 2
Independent Claim
150 words
A method of calibrating an electronic measurement system having sensors which are arranged in pairs on structural parts of an aircraft undercarriage which are loaded transverse to a lengthwise direction and which give off measurement signals which correspond to a vertical displacement between two sensor attachment points staggered from each other in the lengthwise direction of the structural parts, the method comprising the steps of: employing each of said sensor pairs for a single measurement point; arranging the sensor pairs approximately in a horizontal center plane of the structural parts on outside positions of the structural parts opposite each other; determining a separate scaling factor for each sensor of said sensor pairs; applying scaling factors to loads measured by respective ones of the sensors to obtain scaled sensor measurements; and summing scaled sensor measurements of the sensors of a sensor pair to obtain a load measure at a measurement point.
Claim 3
Dependent Claim
19 words
A method according to claim 1, further comprising the step of obtaining an offset for each pair of sensors.
Claim 4
Dependent Claim
59 words
A method according to claim 1, further comprising the step of determining scaling factors (S O , S I ) and an offset (A) from individual measurement signals (C O , C I ) of a pair of sensors, and a weight (W) acting on the corresponding structural part, by use of the formula W=S.sub.O C.sub.O +S.sub.I C.sub.I +A.
Claim 5
Dependent Claim
36 words
A method according to claim 3, further comprising the step of obtaining measurement signals and weights under at least two states of loading of the aircraft, the two loading status being as far apart as possible.
Claim 6
Dependent Claim
37 words
A method according to claim 4, further comprising the step of employing at least two different torsional states of the loaded aircraft structural part to obtain the measurement signals and weights for at least one loading condition.
Claim 7
Dependent Claim
58 words
A method according to claim 5, further comprising the steps of performing a braking of wheels of the aircraft undercarriage while locating at least one wheel on an ascending or descending ramp; and determining a torsion of half axles of a two-wheel undercarriage by braking fast at least one wheel located on the ascending or the descending ramp.
Claim 8
Dependent Claim
47 words
A method according to claim 5, further comprising the steps of placing a plate under one of four wheels of said aircraft undercarriage; and determine a torsion of a pivot arm of the four-wheel undercarriage by the placing of the plate under one of the four wheels.
Claim 9
Dependent Claim
53 words
A method according to claim 5, further comprising the steps of placing plates under two of four wheels of said aircraft undercarriage, the two wheels being arranged diagonally apart from each other; and determining a torsion of pivot arms of the four-wheel undercarriage by the placing of the plates under the two wheels.
Claim 10
Dependent Claim
88 words
A method according to claim 1, wherein the undercarriage is a four-wheel undercarriage, further comprising the steps of obtaining individual measurement signals (C O , C I ) of sensors of a pair of sensors; determining corresponding individual wheel weights (W O , W I ); and calculating the weight and torsion portions (S W , S T ) of calibration factors (S O , S I ) of individual wheels as well as offsets (A O , A I ) by use of the following formulas: ##EQU4##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |