Method for assessing the integrity of a structure

• US 7,546,224 B2
• Filed: 03/03/2003
• Issued: 06/09/2009
• Est. Priority Date: 03/02/2002
• Status: Expired due to Fees

• Current Assignee: Aker Solutions Limited (Akastor ASA)
• Original Assignee: Robert Campbell
• Inventors: Campbell, Robert
• Primary Examiner(s): Rodriguez; Paul L
• Assistant Examiner(s): Jacob; Mary C
• Application Number:
  US10/506,396
• Publication Number:
  US 20050107963A1
• Time in Patent Office: 2,290 Days
• Field of Search: 703/1
• US Class Current: 703/1
• CPC Class Codes: B63B 25/14 pressurised
• CPC Class Codes: G05B 17/02 electric
• CPC Class Codes: G05B 23/0283 Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06

Abstract

A method for assessing the integrity of a structure, comprising the steps of: i) collecting data relating to the initial dimensions of the structure, ii) creating a computer model of the structure, iii) collecting data relating to the estimated load on the structure, iv) analysing the structure, using the computer model of the structure and the load data, in order to define areas which are subject to relatively high stress, v) measuring, after a time interval, the dimensions of the structure in high stress areas, vi) updating the computer model of the structure, using the results of step v), re-analysing the structure, using the updated computer model and the load data, in order to calculate a value for the integrity of the structure.

Claims

1. Method for assessing the integrity of a structure, comprising the steps of:

i) collecting data relating to initial dimensions of the structure,

ii) creating a computer model of the structure using the results of step i),

iii) collecting data relating to an estimated load on the structure,

iv) analyzing the structure, using the computer model of the structure and the load data, in order to define high stress areas, in which areas of the structure future problems can be expected,

v) installing, in the high stress areas, a first set of sensors for measuring the dimensions of the structure in said high stress areas,

vi) measuring, after a time interval, dimensions of the structure in the high stress areas,

vii) updating the computer model of the structure, using the results of step vi),

viii) installing, in the high stress areas, a second set of sensors for measuring the load on the structure in said high stress areas,

ix) measuring the actual load on the structure,

x) updating the data relating to the load on the structure, and thereafter,

xi) re-analyzing the structure, using the updated computer model and the updated load data, in order to calculate a value for the integrity of the structure.

2. Method according to claim 1, further comprising repeating one or more times steps vi), vii), ix), x) and xi).

3. Method according to claim 1, further comprising visualizing the results of step xi).

4. Method according to claim 1, wherein the sensors are connected to a processor, for transmitting data from the sensors to the processing means in real time.

5. Method according to claim 1, further comprising, prior to step iv), collecting data relating to known defects of the structure and thereafter using said defect-data, the computer model of the structure and the load-data for defining areas which are subject to relatively high loads.

6. Method according to claim 1, further comprising, prior to step iv), estimating a minimum size of defects in the structure and thereafter using said estimated defect-data, the computer model of the structure and the load-data for defining areas which are subject to relatively high loads.

7. Method according to claim 6, wherein the minimum size of the defects is estimated to be equal to the precision of measurement equipment used for measuring the dimensions of the structure.

8. Method according to claim 1, further comprising, prior to step iv), collecting data relating to a load-history of the structure and thereafter using said load-history, the computer model of the structure and the load-data for defining areas which are subject to relatively high loads.

17. A computer readable storage medium comprising a computer program comprising data and instructions to carry out the method according to claim 1, when the computer program is executed on a computer system.

18. A computer system comprising a processor and a computer readable storage medium according to claim 17, wherein the computer program, when executed, processes the instructions of said computer program.

9. System for assessing the integrity of a structure, provided with a processor, for containing a computer model of the structure to be analyzed and for using data relating to a load on the structure in the computer model in a calculation of a value representing the integrity of the structure, wherein the system is provided with first sensors to measure data relating to the dimensions of the structure in high stress areas in which areas of the structure future problems can be expected and second sensors to measure the load on the structure in said high stress areas, the sensors being connected to a data logger connected to the processor for transmitting said load and dimension data in real-time to the processor and wherein the processing means are adapted to update the computer model of the structure and to recalculate in the computer model a value representing the integrity of the structure, using said load and dimension data.

10. System according to claim 9, wherein the processor is provided with representation means for visualizing the result of the calculation of the value representing the integrity of the structure.

11. System according to claim 9, wherein the second sensors are adapted to measure pressure exerted on the structure.

12. System according to claim 9, wherein the second sensors are adapted to measure temperature.

13. System according to claim 9, wherein the second sensors are adapted to measure mechanical loading on the structure.

14. System according to claim 9, wherein the second sensors are adapted to measure fluid loading on the structure.

15. System according to claim 9, wherein the second sensors are adapted to measure vibration.

16. System according to claim 9, wherein the second sensors are adapted to measure acceleration experienced by the structure.