FPSO structure fatigue life calculation method
A fatigue life and calculation method technology, applied in the field of marine engineering, can solve problems such as unsuitable environmental conditions and excessive analysis workload, and achieve the effect of small model range, direct thinking and simple calculation method
Inactive Publication Date: 2020-09-04
708TH RES INST OF CSSC
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[0004] The technical problem to be solved by the present invention is: the spectral fatigue evaluation method or the simplified fatigue evaluation method currently used to calculate the fatigue life of FPSO single-point structures has the problem that the analysis workload is too large or it is not suitable for relevant environmental conditions
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[0036] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.
[0037] The principle of the present invention is: by obtaining the long-term distribution curve of the load on the single-point structure and discretizing the long-term distribution curve into several groups of cycle times-load fatigue conditions; The load-stress ratio at the fatigue calculation point, through the linear assumption, combine the load-stress ratio with the load in each group of cycle times-load conditions to...
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The invention provides an FPSO structure fatigue life calculation method. Marine environment conditions of an FPSO operation sea area are considered; a long-term distribution curve of the load borne is obtained by the FPSO single-point structure through calculation; the long-term distribution curve is dispersed into a cycle index-load table, wherein the cycle index-load table comprises a pluralityof groups of deterministic fatigue working conditions; meanwhile, the load stress ratio of each load at the fatigue structure is calculated according to the finite element model of the single-point structure; hot spot stress and corresponding fatigue accumulated damage corresponding to each group of cycle index of a single point are obtained through a linear method in combination with a cycle index-load table and a load stress ratio, finally, the fatigue accumulated damage of each group of fatigue working conditions is accumulated to obtain total fatigue accumulated damage, and finally, the fatigue life is obtained. According to the method provided by the invention, the fatigue life of the single-point structure under the working sea condition can be evaluated more comprehensively, and the method has a relatively high practical engineering value for fatigue life analysis and calculation of the FPSO single-point structure.
Description
technical field [0001] The invention relates to a structural fatigue life calculation method suitable for analysis and evaluation including but not limited to FPSO single-point structures under various sea areas and environmental conditions, and belongs to the field of marine engineering. Background technique [0002] The single-point mooring system is often favored by deep-water FPSOs due to its good adaptability. The FPSO hull can rotate around a single point under the action of external loads, so that it is always in the opposite direction to the resultant force of environmental loads. The crude oil in the wellhead platform of the subsea oilfield can be transported to the FPSO through a single point, and the power and signals on the FPSO can also be transmitted to the wellhead platform. Therefore, for the FPSO hull, the single point is not only the mooring equipment, but also the operation center of the entire oil field, and the structural strength and fatigue life of the...
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IPC IPC(8): G06F30/23G06F113/08G06F119/04G06F119/14
CPCG06F30/23G06F2113/08G06F2119/04G06F2119/14
Inventor 钱笠君孙雪荣徐贺荆海东高宝坤王醍张勇迟少艳
Owner 708TH RES INST OF CSSC