CN103645065A - Offshore wind turbine foundation full-time coupling fatigue analyzing method and system - Google Patents
Offshore wind turbine foundation full-time coupling fatigue analyzing method and system Download PDFInfo
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Abstract
The invention relates to an offshore wind turbine foundation full-time coupling fatigue analyzing method and system. The method includes utilizing SACS software to build an offshore wind turbine foundation and a tower model; outputting a foundation structure data file precede.$PJ; operating BLADED software to read the foundation structure data file precede.$PJ and conducting fatigue work condition load calculation; operating the SACS software to read fatigue load under various work conditions and calculated through the step C and corresponding spectrum parameters, calculating and accumulating fatigue damage under various work conditions and calculating the fatigue service life. The system comprises a modeling module, a model output and storage module, a fatigue work condition load calculation module and a fatigue service life calculation module. By means of the method and system, fatigue calculation and frequency domain and time domain analysis under wind wave flow full-time coupling and fatigue coupling analysis with fatigue load work conditions combined with spectrum curves can be conducted on an offshore wind turbine foundation.
Description
Technical field
The present invention relates to a kind of fatigue analysis method and system of offshore wind turbine, particularly relate to full-time journey coupling fatigue analysis method and the system of a kind of offshore wind turbine foundation under disturbance stream loading.
Background technology
Oversea wind aboundresources.Conventionally the marine wind speed of offshore 10km exceeds 25% than bank is land, and the wind resource in region, deep-sea is than greater coasting area horn of plenty more.According to statistics, U.S. marine site reaches 1533GW in the Oversea wind resource at the depth of water 60～900m place, and the waters of coastal waters 0～30m only has 430GW.According to the research of the mechanisms such as Energy Research Institute of the National Development and Reform Commission, CHINESE OFFSHORE 10m, 20m and the 30m depth of water are about respectively 1 * 10 with interior marine site wind energy resources
8kW, 3 * 10
8kW and 4.9 * 10
8kW.Calculate in proportion, the offshore wind energy resource at 60～900m place, deep-sea will approximately have l7.4 * 10
8kW, Oversea wind power generation development prospect is wide.
There are gravity type, stake formula and several basic patterns such as floating type in the basis of offshore wind turbine.Steel pile foundation is the current maximum a kind of foundation structure pattern of application, is applicable to mesolittoral zone and 100 meters of following depth of water marine sites, have single pile, many, jacket minute.Offshore wind turbine foundation is different from land basis, except bearing wind load, top fan operation load, also bears seaway load, current load etc., how to realize the analysis of blower foundation under various working especially analysis of fatigue be the emphasis that we pay close attention to.
Traditional ocean structure fatigue analysis method is to adopt spectrum fatigue analysis method, it has been generally acknowledged that for offshore platform structure, wave is the main cause that causes structural fatigue, the fatigue lifetime of carrying out computation structure by the distribution probability scatter diagram of wave, is called spectrum fatigue analysis method.And for the analysis of fatigue of land blower fan structure parts, the fatigue that generally adopts the full-time journey curve of load of blower fan to carry out structure is calculated.And for offshore wind turbine foundation, to bear the coupling of wave spectrum+time-histories power simultaneously, this just needs slip-stick artist to solve how to carry out disturbance to flow the lower fatigue calculating of full-time journey coupling, how to carry out the coupling analysis of frequency domain+time domain, how the N of blower fan fatigue load operating mode carried out to the technical matterss such as tired coupling analysis in conjunction with wave spectrum curve, and there is no effective means and the scheme solving the problems of the technologies described above at present both at home and abroad.
Summary of the invention
The technical problem to be solved in the present invention is to provide the full-time journey of a kind of offshore wind turbine foundation coupling fatigue analysis method and system, it can be realized and offshore wind turbine foundation is carried out to disturbance flow fatigue calculating, frequency domain under full-time journey coupling and be combined the tired coupling analysis of wave spectrum curve with time domain coupling analysis and fatigue load operating mode.
For solving the problems of the technologies described above, the full-time journey coupling of a kind of offshore wind turbine foundation of the present invention fatigue analysis method, comprises the following steps: A. utilizes SACS software to set up offshore wind turbine foundation and tower cylinder model; B. export foundation structure data file precede. $ PJ; C. move BLADED software and read foundation structure data file precede. PJ, and carry out tired operating loading calculating; D. move fatigue load and corresponding spectrum parameter under each operating mode that SACS software read step C calculates, calculate and accumulate the fatigue damage under each operating mode, calculate fatigue lifetime.
As a modification of the present invention, described steps A also comprises the limiting force of input model parameter, soil parameters curve, wave current parameter and wheel hub blower fan load.
Also comprise the static strength bearing capacity that utilizes SACS software computation model after described steps A, and when it does not meet design requirement the step of adjustment model parameter, after the static strength bearing capacity of model meets design requirement, just enter step B.
In described step C, BLADED software is to carry out tired operating loading calculating according to IEC61400-1_ed3 design specifications.
Described step C also comprises: the tired time-histories power that BLADED software is calculated is stored in thload (x) the .dat file under corresponding operating mode file, the time-histories force curve of wind is stored in thwind (x) the .dat file under corresponding operating mode file, wave parameter is stored in wvrinp (x) the .dat file under corresponding operating mode file, for SACS software, in step D, read respectively.
Described step D specifically comprises the following steps:
D1. according to model, sea conditions and edaphic condition, carry out pile foundation linearization, generate the hyperelement file of pile foundation;
D2. carry out piling strtucture dynamic analysis, read in the hyperelement file that step D1 generates, the stiffness matrix of generating structure and mass matrix;
D3. under first tired operating mode loading condition, read in the file of corresponding operating mode and stiffness matrix and the mass matrix of step D2 generation that step C generates, node stress width under this operating mode of hyperelement file generated of integrating step D1, with the fatigue of this operating mode, file is set again and jointly carries out fatigue and calculate, generate the file and Cumulative Fatigue Damage file fatigue lifetime under first operating mode;
D4. after tired operating mode load calculate, read in the corresponding operating mode file of step C generation and stiffness matrix and the mass matrix that step D2 generates, node stress width under this operating mode of hyperelement file generated of integrating step D1, with the fatigue of this operating mode, Cumulative Fatigue Damage file that file is combined under a upper operating mode is set again and jointly carries out fatigue and calculate, generate the file and Cumulative Fatigue Damage file fatigue lifetime under this operating mode;
D5. repeating step D4 until complete the fatigue of all operating modes and calculate, obtains the fatigue lifetime of offshore wind turbine foundation.
Described step D1 also considers 1 year one environmental load data of meeting.
Described step D1 also considers the impact of marine growth on piling strtucture.
Described step D carries out Calculation of Fatigue Life according to S-N curve and rain flow method.
Described edaphic condition is based on soil parameters axial load-displacement T-Z curve, pile top load-displacement Q-Z curve and side direction bearing capacity-displacement P-Y curve, according to reconnoitring the ocean bottom soil physical and mechanical properties obtaining, according to standard, APIRP2A calculates.
While choosing S-N curve in described analytical approach, considered the impact of burn into cathodic protection system on S-N curve.
In addition, the present invention also provides a kind of full-time journey coupling of offshore wind turbine foundation analysis of fatigue system of applying said method, comprising: MBM, for utilizing SACS software to set up offshore wind turbine foundation and tower cylinder model; Model output and memory module, for formal output the storage with precede. $ PJ file by the foundation structure data of the model of MBM foundation; Tired operating loading computing module, for the precede. PJ file of exporting by the output of BLADED software reading model and memory module, and carries out tired operating loading calculating; Calculation of Fatigue Life module, for read fatigue load and the corresponding spectrum parameter under each operating mode that tired operating loading computing module calculates by SACS software, calculates and accumulates the fatigue damage under each operating mode, and calculating fatigue lifetime.
Adopt after such design, the present invention at least has the following advantages:
1, in analytical calculation, considered real load condition in offshore wind turbine analysis of fatigue, considered the fatigue lifetime of structure under wave and the acting in conjunction of blower fan time-histories power, truly reflect the operating fatigue load of offshore wind turbine, there is rationality, accuracy;
2, realized the process of wave spectrum+time-histories power coupling analysis, compatible conventional ocean platform analysis of fatigue and land blower fan structure analysis of fatigue, solved very real analysis problem;
3, according to offshore wind turbine foundation design specifications, fixed offshore platform design specifications and IEC61400-1_ed3 design specifications, by means of marine engineering design analysis software SACS and blower fan loading analysis software BLAEDE pre-treatment program and SACS analysis of fatigue post processor, combine and carry out ponograp calculation and Analysis, make that this analytical approach is simple and easy to do, efficiency is high, the cost that uses manpower and material resources sparingly, captured a difficult problem for the full-time journey coupling analysis of offshore wind turbine foundation;
4, based on SACS analysis of fatigue, considered the fatigue load of offshore wind turbine reality comprehensively, comprise the time-histories force curve under each tired operating mode of wave current load and blower fan tower top, S-N curve and rain flow method by specifications recommend such as the built-in API of program, DNV carry out structural pipe node Calculation of Fatigue Life, counting yield is high, analysis is accurate, reliable results, can effectively be applicable to the full-time journey coupling analysis of fatigue under offshore wind turbine foundation disturbance stream condition.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solution of the present invention, and in order to better understand technological means of the present invention, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Fig. 1 utilizes the inventive method and system to carry out the result figure of the full-time journey coupling of offshore wind turbine foundation analysis of Fatigue-life.
Embodiment
The full-time journey coupling analysis of fatigue of offshore wind turbine foundation of the present invention system mainly comprises MBM, model output and memory module, tired operating loading computing module and Calculation of Fatigue Life module, and its corresponding analytical approach comprises the following steps.
The first step, sets up the offshore wind turbine foundation structural model of analysis of fatigue with SACS software, and tower cylinder model is set up in simulation according to hub height, thereby transmits the time-histories load of wheel hub, and the node that calculates offshore wind turbine foundation structure is tired.For example comprise 4 piling bars, supporting construction and tower cylinder, and input spacing, length, diameter and the wall thickness of described piling bar, the pattern of supporting construction and the length of supporting steel pipe, diameter and wall thickness, between piling bar and supporting construction, be connected pattern and concrete size, the diameter of tower cylinder, wall thickness, length and material constant, and the limiting force of soil parameters, wave current parameter and wheel hub blower fan load.
Furthermore, soil parameters of the present invention is by vertical load-displacement T-Z curve, pile top load-displacement Q-Z curve and side direction bearing capacity-displacement P-Y curve, according to reconnoitring the ocean bottom soil physical and mechanical properties obtaining, according to standard APIRP2A, calculate.
Afterwards, also can pass through the static strength bearing capacity of SACS primary Calculation structure, if structural bearing capacity does not meet the demands, adjust physical dimension and reach designing requirement.
Second step, when the static strength of model reaches after designing requirement, directly exports by SACS the foundation structure data file precede. $ PJ that BLADED can read.
The 3rd step, operating analysis program BLADED directly reads foundation structure data file precede. $ PJ, then according to IEC61400-1_ed3 design specifications, carries out tired operating loading calculating (N).
Preferably, it is 1-N that the present invention is stored in respectively corresponding operating mode file X(X the tired time-histories power calculating, in file thload (x) .dat down together), the time-histories force curve of wind is stored in file thwind (x) .dat under corresponding operating mode file X, then wave parameter is stored in file wvrinp (x) .dat under corresponding operating mode file X.
The 4th step, fatigue load and corresponding spectrum parameter under each operating mode that operation SACS software read step C calculates, calculate and accumulate the fatigue damage under each operating mode, thereby obtaining the fatigue lifetime of blower foundation.
Specifically, this technical process comprises:
First, according to foundation structure model, sea conditions and edaphic condition, carry out pile foundation linearization, generate the hyperelement file dynsef.sup of pile foundation.Wherein, foundation structure model and edaphic condition parameter are the parameter of first step input, and the sea conditions of this step can change with different tired operating modes to some extent with respect to the wave current parameter of first step input.Further, except above-mentioned parameter, this step has also been considered environmental load data and the impact of marine growth on structural fatigue of meeting in 1 year one, and wherein, the existence of marine growth has increased the diameter of structural member, increased the weight of structure, these all can affect rigidity, mode of structure etc., and finally affect the fatigue of structure, therefore, can according to circumstances adjust parameter by technician, marine growth thickness, marine growth weight etc. is increased in foundation structure.
Secondly: carry out piling strtucture dynamic analysis, read in stiffness matrix dynmod.dyn and the mass matrix dynmas.dyn of step destination file dynsef.sup generating structure;
Again: under tired operating mode load 1 condition, read in tired time-histories power, wind, file thload (1) .dat that ripple is corresponding, thwind (1) .dat, then the stiffness matrix dynmod.dyn of wvrinp (1) .dat and structure and mass matrix dynmas.dyn file generate wvroci.dat file, this document storage content is the additional time-histories power of bar structure, wave spectrum power etc. is converted into SACSLOAD, then further by wvroci.dat and dynsef.sup, generate static(al) common output file saccsf (1) .dat, this document storage content is node stress maximal value and the minimum value of structure under this operating mode 1, also be node stress width.Then by saccsf (1) .dat and fatigue, file f tginp (1) .dat is set and jointly carries out fatigue under this operating mode 1 and calculate, generate file f tglst (1) .dat and Cumulative Fatigue Damage file f tgdmo (1) .dat fatigue lifetime under this operating mode 1;
Again: under tired operating mode load 2 conditions, read in tired time-histories power, wind, file thload (2) .dat that ripple is corresponding, thwind (2) .dat, then the stiffness matrix dynmod.dyn of wvrinp (2) .dat and structure and mass matrix dynmas.dyn file generate wvroci.dat file, this document storage content is the additional time-histories power of bar structure, wave spectrum power etc. is converted into SACS LOAD, then further by wvroci.dat and dynsef.sup, generate static(al) common output file saccsf (2) .dat, this document storage content is node stress maximal value and the minimum value of structure under this operating mode 2, also be node stress width.Then read saccsf (2) .dat and fatigue and the fatigue that file f tginp (2) .dat carries out under this operating mode 2 jointly with Cumulative Fatigue Damage file f tgdmo (1) .dat of operating mode 1 time output is set calculates, generate file f tglst (2) .dat and Cumulative Fatigue Damage file f tgdmo (2) .dat fatigue lifetime under this operating mode 2;
Again: under tired operating mode X condition, repeat step above, Cumulative Fatigue Damage output file ftgdmo (X-1) .dat reading under X-1 operating mode in tired calculating is used for carrying out Calculation of Fatigue Life, then exports Cumulative Fatigue Damage file f tgdmo (X) .dat and calculates for the fatigue under X+1 operating mode;
Last: under tired operating mode N condition, repeat step above, Cumulative Fatigue Damage output file ftgdmo (N-1) .dat reading under N-1 operating mode is used for carrying out Calculation of Fatigue Life, generates the fatigue lifetime that fatigue results file f tglst (N) .dat shown in Fig. 1 is offshore wind turbine foundation.
Furthermore; the present invention can choose the S-N curve of the specifications recommend such as built-in API, DNV; also self-defined S-N curve rule of thumb; and rain flow method carries out structural pipe node Calculation of Fatigue Life, and when choosing S-N curve, considered the impact of burn into cathodic protection system on S-N curve.
As mentioned above, the inventive method is according to offshore wind turbine foundation design specifications, fixed offshore platform design specifications and IEC61400-1_ed3 Specification Design, based on marine engineering design analysis software SACS and blower fan loading analysis software BLADED, combines and carries out analysis of fatigue calculating.Wherein, soft SA CS is used for setting up offshore wind turbine foundation structural model and tower cylinder model, and foundation structure model comprises piling bar and supporting construction two parts; Software BLADED is used for calculating the suffered fatigue load of blower fan structure, during foundation structure analysis of fatigue, consider time-histories force curve and seaway load under each fatigue load operating mode of tower top wheel hub, and based on Cumulative Fatigue Damage rule by total impairment value of the accumulated damage superposition calculation structure under each operating mode, and then fatigue lifetime of computation structure.
The present invention is directed to each operating mode and carry out three step computings, a rear operating mode also needs to read the result of calculation under previous operating mode, realized the coupling analysis of disturbance stream, time-histories, by writing processing file and integrated calculating, realized quick calculating, improved efficiency, solved the coupling computational problem of spectrum fatigue and time-histories fatigue, be different from existing analytical approach completely and only can carry out simply composing tired calculating or the calculating of time-histories fatigue or equivalent load calculating.In general, the present invention has found the method that is more suitable for carrying out offshore wind turbine foundation analysis of fatigue, can calculate really the fatigue under disturbance stream and the effect of blower fan time-histories power.
The above; it is only preferred embodiment of the present invention; not the present invention is done to any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (12)
1. the full-time journey of an offshore wind turbine foundation coupling fatigue analysis method, is characterized in that comprising the following steps:
A. utilize SACS software to set up offshore wind turbine foundation and tower cylinder model;
B. export foundation structure data file precede. $ PJ;
C. move BLADED software and read foundation structure data file precede. PJ, and carry out tired operating loading calculating;
D. move fatigue load and corresponding spectrum parameter under each operating mode that SACS software read step C calculates, calculate and accumulate the fatigue damage under each operating mode, calculate fatigue lifetime.
2. the full-time journey coupling of a kind of offshore wind turbine foundation according to claim 1 fatigue analysis method, is characterized in that described steps A also comprises the limiting force of input model parameter, soil parameters curve, wave current parameter and wheel hub blower fan load.
3. the full-time journey of a kind of offshore wind turbine foundation according to claim 1 coupling fatigue analysis method, it is characterized in that also comprising the static strength bearing capacity that utilizes SACS software computation model after described steps A, and when it does not meet design requirement the step of adjustment model parameter, after the static strength bearing capacity of model meets design requirement, just enter step B.
4. the full-time journey coupling of a kind of offshore wind turbine foundation according to claim 1 fatigue analysis method, is characterized in that in described step C, BLADED software is to carry out tired operating loading calculating according to IEC61400-1_ed3 design specifications.
5. the full-time journey of a kind of offshore wind turbine foundation according to claim 1 coupling fatigue analysis method, it is characterized in that described step C also comprises: the tired time-histories power that BLADED software is calculated is stored in thload (x) the .dat file under corresponding operating mode file, the time-histories force curve of wind is stored in thwind (x) the .dat file under corresponding operating mode file, wave parameter is stored in wvrinp (x) the .dat file under corresponding operating mode file, for SACS software, in step D, read respectively.
6. the full-time journey of a kind of offshore wind turbine foundation according to claim 1 coupling fatigue analysis method, is characterized in that described step D specifically comprises the following steps:
D1. according to model, sea conditions and edaphic condition, carry out pile foundation linearization, generate the hyperelement file of pile foundation;
D2. carry out piling strtucture dynamic analysis, read in the hyperelement file that step D1 generates, the stiffness matrix of generating structure and mass matrix;
D3. under first tired operating mode loading condition, read in the file of corresponding operating mode and stiffness matrix and the mass matrix of step D2 generation that step C generates, node stress width under this operating mode of hyperelement file generated of integrating step D1, with the fatigue of this operating mode, file is set again and jointly carries out fatigue and calculate, generate the file and Cumulative Fatigue Damage file fatigue lifetime under first operating mode;
D4. after tired operating mode load calculate, read in the corresponding operating mode file of step C generation and stiffness matrix and the mass matrix that step D2 generates, node stress width under this operating mode of hyperelement file generated of integrating step D1, with the fatigue of this operating mode, Cumulative Fatigue Damage file that file is combined under a upper operating mode is set again and jointly carries out fatigue and calculate, generate the file and Cumulative Fatigue Damage file fatigue lifetime under this operating mode;
D5. repeating step D4 until complete the fatigue of all operating modes and calculate, obtains the fatigue lifetime of offshore wind turbine foundation.
7. the full-time journey coupling of a kind of offshore wind turbine foundation according to claim 6 fatigue analysis method, is characterized in that described step D1 also considers the environmental load data of meeting for a year.
8. the full-time journey coupling of a kind of offshore wind turbine foundation according to claim 6 fatigue analysis method, is characterized in that described step D1 also considers the impact of marine growth on piling strtucture.
9. the full-time journey coupling of a kind of offshore wind turbine foundation according to claim 1 fatigue analysis method, is characterized in that described step D carries out Calculation of Fatigue Life according to S-N curve and rain flow method.
10. the full-time journey of a kind of offshore wind turbine foundation according to claim 1 coupling fatigue analysis method, it is characterized in that described edaphic condition is based on soil parameters axial load-displacement T-Z curve, pile top load-displacement Q-Z curve and side direction bearing capacity-displacement P-Y curve, according to reconnoitring the ocean bottom soil physical and mechanical properties obtaining, according to standard API RP2A, calculate.
The full-time journey coupling of 11. a kind of offshore wind turbine foundation according to claim 1 fatigue analysis method, has considered the impact of burn into cathodic protection system on S-N curve while choosing S-N curve in the analytical approach described in it is characterized in that.
The full-time journey coupling of the offshore wind turbine foundation analysis of fatigue system of method described in any one in 12. 1 kinds of application rights requirement 1-11, is characterized in that comprising:
MBM, for utilizing SACS software to set up offshore wind turbine foundation and tower cylinder model;
Model output and memory module, for formal output the storage with precede. $ PJ file by the foundation structure data of the model of MBM foundation;
Tired operating loading computing module, for the precede. PJ file of exporting by the output of BLADED software reading model and memory module, and carries out tired operating loading calculating;
Calculation of Fatigue Life module, for read fatigue load and the corresponding spectrum parameter under each operating mode that tired operating loading computing module calculates by SACS software, calculates and accumulates the fatigue damage under each operating mode, and calculating fatigue lifetime.
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