Global Patent Index - EP 1320748 A1

EP 1320748 A1 2003-06-25 - MONITORING STRUCTURES

Title (en)

MONITORING STRUCTURES

Title (de)

ÜBERWACHUNG VON STRUKTUREN

Title (fr)

SURVEILLANCE DE STRUCTURES

Publication

EP 1320748 A1 (EN)

Application

EP 01945516 A

Priority

  • GB 0102992 W
  • GB 0020655 A

Abstract (en)

[origin: WO0216926A1] Offshore oil and gas exploration and production companies maintain large open lattice structures that are mostly underwater. To extend the design life of these structures requires a method to monitor a structure so as to give advance warning before a structural member (18, 19) or (20) should fail. The method proposed by the invention measures the vibration response at a number of points 17 distributed around the structure to forces input 15 in th acoustic range up to about 20kHz at a much smaller number of points. The time of arrival, magnitude and phase of the pulses (11, 12, 13) and (14) at the response points 17 change in a manner that is sufficient to indicate the presence of a substantial crack in one of the members and is sufficient to indicate the location of that defect. The influence of changes in supported mass is removed by effectively isolating the variable mass with additional actuator groups placed between the supported mass and the main structure actively controlled so as to make this cross-section behave as a

IPC 1-7 (main, further and additional classification)

G01N 29/14; G01M 7/00

IPC 8 full level (invention and additional information)

G01N 29/12 (2006.01); G01N 29/34 (2006.01); G01N 29/46 (2006.01)

CPC (invention and additional information)

G01N 29/46 (2013.01); G01N 29/12 (2013.01); G01N 29/348 (2013.01); G01N 2291/011 (2013.01); G01N 2291/012 (2013.01); G01N 2291/015 (2013.01); G01N 2291/105 (2013.01)

Citation (search report)

See references of WO 0216926A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

EPO simple patent family

WO 0216926 A1 20020228; AU 6773101 A 20020304; EP 1320748 A1 20030625; GB 0020655 D0 20001011; GB 2366382 A 20020306

INPADOC legal status


2007-07-25 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20070201

2006-11-29 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20061026

2004-11-10 [R17P] REQUEST FOR EXAMINATION FILED (CORRECTION)

- Effective date: 20030419

2003-06-25 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20030317

2003-06-25 [AK] DESIGNATED CONTRACTING STATES:

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2003-06-25 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: AL LT LV MK RO SI