CN116401758B - Method for evaluating feasibility of split installation of wind turbine generator on crane ship - Google Patents
Method for evaluating feasibility of split installation of wind turbine generator on crane ship Download PDFInfo
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- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
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Abstract
The invention discloses a method for evaluating feasibility of split installation of a wind turbine generator on a crane ship, which comprises the following steps: the method comprises the steps of firstly, judging whether a crane ship can be provided with a tower barrel and a cabin of a fan in a split mode; and step two, judging whether the crane ship can be provided with blades of the fan in a split mode. When the process is carried out, firstly calculating a motion amplitude response operator of the crane ship; secondly, calculating the speed, acceleration and displacement of the vertical movement of the suspended object; then calculating the inertia force of the suspended object; then, each section of tower barrel is contacted with the installed part at different inclination angles for analysis; then checking the dead weight stability of the tower; when the second flow is carried out, calculating boundary conditions of blades of a self-elevating platform ship with fans under the action of wind load in an explicit dynamics module; then calculating a motion amplitude response operator of the crane ship; and calculating radial displacement and radial displacement speed of the root of the blade, and comparing with boundary conditions. The invention can predict whether the crane ship can operate under certain environmental conditions.
Description
Technical Field
The invention relates to a method for evaluating feasibility of split installation of a wind turbine generator on a crane ship.
Background
Compared with the construction of an onshore wind farm, the construction of an offshore wind farm is a complex system engineering. The method comprises the steps of fan foundation construction, fan preassembling, offshore installation and debugging, ship installation use, logistics allocation, cable and offshore transformer station arrangement and construction and the like. The installation of the fan is limited by factors such as weather, sea waves and water currents, and the like, so that the fan is one of the most important difficulties in the construction of the offshore wind farm. In addition, the single-machine capacity of the offshore wind turbine is still developing to be large-scale, and the existing installation technology is also required to be higher.
At present, the installation operation of European offshore wind turbine generators mainly adopts a self-elevating platform ship. The sea geological conditions in the sea area of China have huge differences, and are not suitable for the operation of self-elevating platform ships and seat-bottom platform ships. In particular, in coastal areas of Shanghai and Zhejiang, deep silt layers exist on the sea bottom, the support leg length of the self-elevating platform ship is limited, the operation of inserting and pulling the support leg is difficult, the risk is high, the bearing capacity of the seabed foundation of the seat-bottom platform ship is poor, the influence of water flow waves is large, and the construction window period is short. Therefore, when the submarine geological conditions of the offshore wind farm site selection area are not suitable for the operation of the jack-up platform ship, split installation on the sea by adopting a crane ship is an important approach. However, when the wind turbine generator is installed by adopting the crane ship in a split mode, the wind turbine generator is greatly influenced by wind wave load, and no clear condition for guiding whether the crane ship can be operated or not in the split mode is known in the industry at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an evaluation method for the feasibility of split installation of a wind turbine generator on a crane ship, which can predict whether the crane ship can operate under certain environmental conditions, so that the waiting time of the crane ship is effectively reduced, and the operating efficiency of split installation of the wind turbine generator on the crane ship is improved.
The purpose of the invention is realized in the following way: a method for evaluating feasibility of split installation of wind turbine on a crane ship comprises the following steps: the method comprises the steps of firstly, judging whether a crane ship can be provided with a tower barrel and a cabin of a fan in a split mode; judging whether the crane ship can be provided with blades of the fan in a split mode or not;
the process time comprises the following steps:
step one, a model of a crane ship is built in a hydrodynamic analysis module, PM spectrum is used for simulation, and wave parameters are input: the wave height and the wave period are calculated to obtain a motion amplitude response operator RAO (omega) of the crane ship;
the expression of the wave density profile is:
in the formula (1): s is S PM (ω) is a PM wave density spectrum; h S Is wave height; t (T) P Is the wave period; omega is the wave frequency;
substituting a motion amplitude response operator RAO (omega) into the floating body dynamics module for analysis to obtain a motion response spectrum of the vertical motion of the suspended object, thereby obtaining the speed, acceleration and displacement of the vertical motion of the suspended object;
calculating the inertia force of the suspended object according to the analyzed acceleration of the suspended object in vertical motion;
when the calculated inertial force of the suspended object is smaller than the safe load of the suspended steel cable given by a manufacturer, judging that the acceleration of the crane ship under the current sea condition meets the requirement of split installation of the tower barrel and the engine room;
when the calculated displacement of the vertical motion of the suspended object is smaller than the displacement amplitude of the vertical motion of the lifting hook obtained through experience, judging that the displacement of the motion of the crane ship under the current sea condition meets the requirements of split installation of the tower barrel and the cabin;
step four, adopting an explicit dynamics analysis module to analyze the contact of each section of tower barrel and the installed part at different inclination angles, namely establishing a tower barrel model of a fan in the explicit dynamics analysis module, setting the vertical movement speed of a hung object as the initial speed of hanging each section of tower barrel so as to simulate the installation process of each section of tower barrel, and calculating to obtain the maximum Van stress of each section of tower barrel and the installed part in the impact process of the butt joint moment; when the tower barrel is in butt joint with the installed part, the inclination angle is 0-180 degrees, and the corresponding inclination angle of the maximum Van stress is obtained by comparing Van stress of the tower barrel under different inclination angles, so that a relation curve of the Van stress and impact time under the current inclination angle is obtained; when the Van stress of the tower is smaller than the material yield limit of the tower in the impact time, the motion speed of the crane ship under the current sea condition is considered to meet the requirement of split installation of the tower; the method comprises the steps that an explicit dynamics analysis module is adopted to analyze the contact between a nacelle and an installed tower, namely, a nacelle model of a fan is built in the explicit dynamics analysis module, the vertical movement speed of a hung object is set to be the initial speed of the hanging nacelle, so that the installation process of the nacelle is simulated, the maximum Van stress of the impact process at the moment of butt joint of the nacelle and the installed tower is calculated, and a relation curve of the Van stress and the impact time is obtained; when the Van stress of the engine room in the impact time is smaller than the material yield limit of the engine room, the motion speed of the crane ship under the current sea condition is considered to meet the requirement of split installation of the engine room;
fifthly, checking the dead weight stability of the tower barrel; after hoisting of each section of tower section of thick bamboo is finished, before installing flange bolt, the lifting hook of hoist can loosen the hook, and the external force that the tower section of thick bamboo receives is wind load this moment, and wind load adopts formula (2) to calculate:
F w ＝C·Q·S·sinα (2)
in the formula (2), F w Is wind load; c is the shape factor of the tower; q is basic wind pressure; s is the windward area of the tower barrel; alpha is the angle between the wind direction and the axis of the tower;
when wind load acts on the tower, a overturning moment M is generated overt Overturning moment M overt Calculation using equation (3):
M overt ＝q·F w 2 /4 (3)
in the formula (3), M overt Is the overturning moment; q is the height of the tower;
when the wind load is applied, the dead weight of the tower barrel can generate anti-overturning moment M r Anti-overturning moment M r Calculation using equation (4):
M r ＝G·d (4)
in the formula (4), M r Is an anti-overturning moment; g is the gravity of the tower barrel; d is the horizontal position of the gravity center of the tower barrel;
definition of anti-capsizing moment M r And overturning moment M overt The ratio of (2) is the self-weight stability safety coefficient F s ；
When the self-weight stability safety factor F s When the self-weight stability safety coefficient is larger than the self-weight stability safety coefficient experience value, the self-weight stability of the tower under the current sea condition is considered to meet the requirement of split installation;
step six, under the current sea condition, when the speed, the acceleration and the displacement of the vertical movement of the tower barrel and the engine room simultaneously meet the installation requirement and the self-weight stability of the tower barrel also meets the requirement, the crane ship under the current sea condition is considered to be capable of carrying out split installation on the tower barrel and the engine room of the fan;
when the second flow is carried out, the method comprises the following steps:
firstly, establishing a model for installing blades of a self-elevating platform ship in an explicit dynamics module, and calculating the maximum radial displacement and the maximum radial displacement speed of the root of the blades under the action of wind load, thereby obtaining the boundary condition of the blades of a self-elevating platform ship installing fan under the current environmental condition;
calculating a motion amplitude response operator RAO (omega) of the crane ship by adopting a hydrodynamic analysis module;
substituting a motion amplitude response operator RAO (omega) of the crane ship into a floating body dynamics module to calculate a motion response spectrum of the blade root, so as to obtain the radial displacement speed and the radial displacement of the blade root;
and fourthly, comparing the calculated radial displacement speed and radial displacement of the root of the blade with the boundary condition of the blade of the self-elevating platform ship for installing the fan, and considering that the crane ship can be used for split installation of the blade of the fan under the current sea condition when the calculated radial displacement speed and radial displacement of the root of the blade are smaller than the boundary condition.
The method for evaluating the feasibility of split installation of the wind turbine generator on the crane ship has the following characteristics: according to the actual operation condition of the crane ship split installation wind turbine generator and the corresponding environmental condition characteristics, the hydrodynamic force analysis module, the floating body dynamics module and the explicit dynamics module are adopted to accurately analyze the operable environmental condition of the crane ship, and on the basis of the environmental condition, whether the future crane ship can operate under a certain environmental condition can be predicted, so that the waiting time of the crane ship is effectively shortened, and the operation efficiency of the crane ship split installation wind turbine generator is improved.
Drawings
FIG. 1 is a flow chart of a method for evaluating the feasibility of split-mounting a wind turbine on a crane vessel according to the present invention;
FIG. 2a is a graph of the magnitude response operator of the roll direction movement at the hook resulting from step one of the process one of the present invention;
FIG. 2b is a graph of the magnitude response operator of the pitch direction movement at the hook as obtained in step one of the process one of the present invention;
FIG. 2c is a graph of a motion amplitude response operator for heave direction at a hook, as obtained in step one of the process of the present invention;
FIG. 3 is a diagram of a force analysis of a tower in a fifth step of the process of the present invention;
FIG. 4a is a graph showing the stress profile generated during installation of a first pitch tower as a result of step five of the process one of the present invention;
FIG. 4b is a graph showing the stress time course generated by the second tower section and the foundation at the moment of installation, which is obtained by performing step five of the first process of the present invention;
FIG. 4c is a graph showing the stress time course generated during the installation of the third tower section obtained in step five of the first process of the present invention;
FIG. 4d is a graph of the stress time course generated during installation of the fourth pitch tower from step five of the process one of the present invention;
FIG. 4e is a graph of stress time course generated during installation of the nacelle resulting from step five of the process one of the present invention;
FIG. 5a is a time course graph of radial displacement of a blade root obtained by performing step three of the second process of the present invention;
fig. 5b is a time course graph of the radial displacement velocity of the blade root obtained by performing step three of the procedure two of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 5b, the method for evaluating feasibility of split-mounting a wind turbine on a crane ship according to the present invention includes: the method comprises the steps of firstly, judging whether a crane ship can be provided with a tower barrel and a cabin of a fan in a split mode; and step two, judging whether the crane ship can be provided with blades of the fan in a split mode.
The process time comprises the following steps:
step one, a model of the crane ship is built in an ANSYS19.2workbench AQWA hydrodynamic analysis module, PM spectrum is used for simulation, and wave parameters are input: the wave height and the wave period are calculated to obtain a motion amplitude response operator RAO (omega) of the crane ship;
the expression of the wave density profile is:
in the formula (1): s is S PM (ω) is a PM wave density spectrum; h S Is wave height; t (T) P Is the wave period; omega is the wave frequency;
using PM spectra in an ANSYS19.2workbench AQWA hydrodynamic analysis module to describe waves in shallow waters; since sea wave conditions generally have a stability of 3 hours, sea wave conditions generally include wave height H in wave elements of 3 hours by 3 hours S Sum wave period T P Is given in the form of (c). According to current ocean engineering experience, the PM spectrum is suitable for describing random wave sea conditions (corresponding to operation conditions) with shorter reproduction period, the PM spectrum with the same sense wave height and variance is wider and shorter than the JONSWAP spectrum, the energy of other frequencies except the spectrum peak frequency range is larger than the JONSWAP spectrum, and wave components in the frequency ranges can cause larger motion of the floating body in shallow water areas, becauseThe description of random waves by adopting PM spectrum can obtain more conservative motion response;
substituting a motion amplitude response operator RAO (omega) into an ANSYS19.2workbench AQWA floating body dynamics module for analysis to obtain a motion response spectrum of the vertical motion of the suspended object, thereby obtaining the speed, acceleration and displacement of the vertical motion of the suspended object;
calculating the inertia force of the suspended object according to the analyzed acceleration of the suspended object in vertical motion;
the amplitude of the vertical motion acceleration of the lifting hook directly causes the suspended object to increase inertial acceleration beyond the gravity acceleration, so that the load of the suspended lockset is increased; when the calculated inertial force of the suspended object is smaller than the safe load of the suspended steel cable given by a manufacturer, judging that the acceleration of the crane ship under the current sea condition meets the requirement of split installation of the tower barrel and the engine room;
when the calculated displacement of the vertical motion of the suspended object is smaller than the displacement amplitude of the vertical motion of the lifting hook obtained through experience by 15cm, judging that the displacement of the motion of the crane ship under the current sea condition meets the requirements of split installation of the tower barrel and the cabin; because the displacement amplitude of the vertical movement of the lifting hook directly influences the dangerous impression of operators, the displacement amplitude of the vertical movement of the lifting hook which can be installed at present is 15cm based on a large amount of experience of related projects;
step four, the vertical movement speed of the lifting hook directly influences the structural impact strength of the installed part and the installed part at the butt joint installation moment, and the structural impact at the installation moment can possibly cause structural damage of the part; when the tower is hoisted, because of the arrangement reason of the hoisting point position of each tower section, the bottom tower section is in non-vertical contact with a foundation or the upper tower section is in contact with the installed lower tower section, but a certain inclination angle exists, so that an explicit dynamics analysis module is adopted to analyze the contact of each tower section and the installed component at different inclination angles, namely a tower section model of a fan is built in the explicit dynamics analysis module, the vertical movement speed of a hoisted object is set as the initial speed of hoisting each tower section, so as to simulate the installation process of each tower section, and the maximum Van stress of the impact process of each tower section and the installed component (including the space between the bottom section and the foundation, the space between the second tower section and the bottom tower section, the space between the third tower section and the second tower section, and the space between the top tower section and the third tower section) at the moment of butt joint is calculated; when the inclination angle of the tower barrel is 0-180 degrees at the moment of butt joint of the tower barrel and the installed part, the inclination angle corresponding to the maximum Van stress is obtained by comparing Van stress of the tower barrel under different inclination angles, so that a relation curve of the Van stress and impact time under the current inclination angle is obtained, and when the Van stress of the tower barrel in the impact time is smaller than the material yield limit of the tower barrel, the motion speed of the crane ship under the current sea condition is considered to meet the requirement of split installation of the tower barrel;
when the nacelle is installed, as each section of tower barrel is installed, the nacelle can impact the tower barrel when being installed, an ANSYS19.2Workbench explicit dynamics explicit dynamics analysis module is adopted to analyze the contact between the nacelle and the installed tower barrel, namely, a nacelle model of a fan is built in the explicit dynamics analysis module, the vertical movement speed of a hung object is set as the initial speed of the hoisted nacelle so as to simulate the installation process of the nacelle, and the maximum Van stress of the impact process at the moment of butting the nacelle and the installed tower barrel is calculated, so that the relation curve of the Van stress and the impact time is obtained; when the Van stress of the engine room in the impact time is smaller than the material yield limit of the engine room, the motion speed of the crane ship under the current sea condition is considered to meet the requirement of split installation of the engine room;
step five, checking the dead weight stability of the tower, wherein after the hoisting of the tower is finished and before the anchor bolts are installed, the hook of the crane can be loosened (the hook is not separated, but the pulling force is removed and a certain margin rope length is ensured), at this time, the external force borne by the tower is mainly wind load, and the wind load is calculated by adopting the formula (2):
F w ＝C·Q·S·sinα (2)
in the formula (2), F w Is wind load; c is the shape factor of the tower; q is basic wind pressure; s is the windward area of the tower barrel; alpha is the angle between the wind direction and the axis of the tower;
when wind load acts on the tower, a overturning moment M is generated overt Overturning moment M overt Calculation using equation (3):
M overt ＝q·F w 2 /4 (3)
in the formula (3), M overt Is the overturning moment; q is the height of the tower;
when the wind load is applied, the dead weight of the tower barrel can generate anti-overturning moment M r Anti-overturning moment M r Calculation using equation (4):
M r ＝G·d (4)
in the formula (4), M r Is an anti-overturning moment; g is the gravity of the tower barrel; d is the horizontal position of the gravity center of the tower barrel;
definition of anti-capsizing moment M r And overturning moment M overt The ratio of (2) is the self-weight stability safety coefficient F s ；
When the self-weight stability safety factor F s When the self-weight stability safety coefficient is larger than the self-weight stability safety coefficient experience value of 10, the self-weight stability of the tower under the current sea condition is considered to meet the requirement of split installation;
step six, when the vertical movement speed, acceleration and displacement of the tower and the engine room simultaneously meet the installation requirements under the current sea condition and the self-weight stability of the tower meets the split installation requirements, the crane ship under the current sea condition is considered to be capable of split installation of the tower and the engine room of the fan.
In the blade mounting process of a fan, whether the mounting is successful depends mainly on the following two key factors:
(1) Radial displacement of the blade root during installation; if the radial displacement of the blade root is too large, the blade root cannot be mounted at the hub opening of the nacelle;
(2) Radial displacement speed of the blade root during installation; if the radial displacement speed of the blade root is too high, the blade root collides with the hub opening, thereby damaging the guide pins of the blade root.
When the second flow is carried out, the method comprises the following steps:
step one, because the motion amplitude of the self-elevating platform ship is smaller under the wave condition, a model for installing the blades of the self-elevating platform ship is built in an ANSYS19.2workbench explicit dynamics explicit dynamic module, and the maximum radial displacement speed of the root of the blades under the action of wind load are calculated, so that the boundary condition of the blades of the self-elevating platform ship for installing a fan under the current environment condition is obtained;
calculating a motion amplitude response operator RAO (omega) of the crane ship by adopting an ANSYS19.2Workbench AQWA hydrodynamic analysis module;
substituting a motion amplitude response operator RAO (omega) of the crane ship into an ANSYS19.2Workbench AQWA floating body dynamics module to calculate a motion response spectrum of the blade root, so as to obtain the speed and displacement of the blade root;
and fourthly, comparing the calculated radial displacement speed and radial displacement of the root of the blade with the boundary condition of the blade of the self-elevating platform ship for installing the fan, and considering that the crane ship can be used for split installation of the blade of the fan under the current sea condition when the calculated radial displacement speed and radial displacement of the root of the blade are smaller than the boundary condition.
The following describes the steps of the present invention in detail, taking a crane ship to install fan components in a split manner in a sea area as an example.
In this example, the lifting vessel has a ship length of 188.15m, a profile width of 58.40m, a profile depth of 10.38m, and a design draft of 5.60m. The size of a bottom section tower barrel in the installed fan is phi 7.0m multiplied by 16.18m, and the weight of the bottom section tower barrel is 95t; the second tower section has the size phi 7.0m multiplied by 24.0m and the weight of 132t; the third section tower has the size phi 7.0m multiplied by phi 5.424m multiplied by 28.70m and the weight of 133t; the size of the top section tower barrel is phi 5.424m multiplied by phi 4.050 multiplied by 25.05m, and the weight of the top section tower barrel is 205t; the nacelle has dimensions 10.048m× 5.478m× 14.428m and a weight of 280t; the length of the blade is 85m; the wave height of the operation sea area is 0.8m, the wave period is 4.1s, and the wind speed is 10m/s.
The first process is carried out, and whether the crane ship can be provided with a tower barrel and a cabin of the fan in a split mode is judged; the method comprises the following steps:
step one, a model of the crane ship is built in an ANSYS19.2Workbench AQWA hydrodynamic analysis module, PM spectrum is used for simulation, the input wave height is 0.8m, the wave period is 4.1s, and a motion amplitude response operator of the crane ship is obtained through calculation, as shown in fig. 2a, 2b and 2 c;
substituting a motion amplitude response operator of the crane ship into an ANSYS19.2workbench AQWA floating body dynamics module for analysis to obtain a motion response spectrum of the vertical motion of the suspended object, so as to obtain the speed, acceleration and displacement of the vertical motion of the suspended object, wherein the result is shown in the following table 1;
TABLE 1
| Angle of incidence of waves (°) | Heave displacement (m) | Heave velocity (m/s) | Heave acceleration (m/s 2) |
| 0 | 0.125 | 0.125 | 0.038 |
| 15 | 0.069 | 0.068 | 0.021 |
| 30 | 0.046 | 0.041 | 0.013 |
| 45 | 0.088 | 0.079 | 0.026 |
| 60 | 0.051 | 0.049 | 0.017 |
| 75 | 0.052 | 0.051 | 0.018 |
| 90 | 0.090 | 0.084 | 0.031 |
| 105 | 0.070 | 0.063 | 0.024 |
| 120 | 0.058 | 0.051 | 0.020 |
| 135 | 0.060 | 0.055 | 0.023 |
| 150 | 0.033 | 0.029 | 0.013 |
| 165 | 0.046 | 0.045 | 0.020 |
| 180 | 0.084 | 0.084 | 0.040 |
As shown in table 1, under different wave incident angles, the displacement of the vertical motion of the suspended object is smaller than the displacement amplitude of the vertical motion of the suspension hook obtained by experience by 15cm, so that the displacement of the vertical motion of the suspended object meets the requirement;
calculating the inertia force of the suspended object according to the analyzed acceleration of the suspended object in vertical motion;
calculating the load of the crane ship for hoisting the steel cable of different fan parts according to the acceleration of the vertical movement of the hoisted object in the table 1, and the result is shown in the table 2 below;
table 2.
The safety load of the hoisting steel cable provided by the manufacturer is 500t and is larger than the calculated load of the hoisting steel cable for hoisting different fan parts by the crane ship, so that the acceleration of the vertical movement of the hoisted object meets the requirement;
step four, adopting an ANSYS19.2Workbench explicit dynamics explicit dynamics analysis module to analyze that a bottom section tower barrel contacts a foundation or an upper section tower barrel contacts an installed lower section tower barrel by different inclination angles, namely, establishing a tower barrel model of a fan in the explicit dynamics analysis module, setting the vertical movement speed of a hung object as the initial speed of hanging each section tower barrel so as to simulate the installation process of the four section tower barrels, calculating to obtain the maximum Van stress of the impact process, calculating once every 5 DEG when the tower barrels are in butt joint with installed parts, and comparing the Van stress of the tower barrels under different inclination angles to obtain the inclination angle corresponding to the maximum Van stress, thereby obtaining a relation curve of the Van stress under the current inclination angle and the impact time, see FIG. 4a, FIG. 4b, FIG. 4c and FIG. 4d; from fig. 4a, 4b, 4c and 4d, it can be seen that the maximum van der waals stress of each section of tower is smaller than the material yield limit (q355, 355 mpa) of the tower, so that the vertical movement speed of the suspended object is considered to meet the requirement;
analyzing the contact of the nacelle and the installed tower by adopting an ANSYS19.2Workbench explicit dynamics explicit dynamics analysis module, namely establishing a nacelle model of a fan in the explicit dynamics analysis module, setting the vertical movement speed of the suspended object as the initial speed of the suspended nacelle so as to simulate the installation process of the nacelle, and calculating to obtain the maximum Van stress of the impact process at the moment of butt joint of the nacelle and the installed tower, thereby obtaining a relation curve of the Van stress and the impact time, wherein the maximum Van stress of the nacelle is smaller than the material yield limit (Q355,355 MPa) of the nacelle according to the relation curve of the Van stress and the impact time, and the maximum Van stress of the nacelle is smaller than the material yield limit (Q355,355 MPa) of the nacelle according to the relation curve of the figure 4e, so that the vertical movement speed of the suspended object is considered to meet the requirement;
fifthly, checking the self-weight stability of the tower, and calculating by adopting a formula (2), a formula (3) and a formula (4), wherein the calculation result is shown in the following table 3:
table 3.
From table 3, it can be known that the dead weight stability safety coefficient of each section tower is greater than the dead weight stability safety coefficient empirical value 10, so that the dead weight stability of the tower meets the requirement;
step six, the crane ship can be provided with a tower barrel and a cabin of a fan in a split mode under the working condition of the operation sea area.
And a second flow is carried out to judge whether the crane ship can be provided with the blades of the fan in a split mode, and the method comprises the following steps:
step one, a model of a self-elevating platform ship mounted blade is built in an ANSYS19.2Workbench explicit dynamics explicit dynamics module, the maximum displacement and the maximum speed of the blade root under the action of wind load are calculated, and the calculation results are shown in fig. 5a and 5b; from fig. 5a and 5b, it can be seen that the maximum displacement of the root of the blade installed on the jack-up platform ship under the current environmental condition is 0.0557m, and the maximum speed is 0.2145m/s, which is the boundary condition of the blade installed on the jack-up platform ship under the current environmental condition.
Calculating a motion amplitude response operator of the crane ship by adopting an ANSYS19.2Workbench AQWA hydrodynamic analysis module;
substituting a motion amplitude response operator RAO (omega) of the crane ship into an ANSYS19.2workbench AQWA floating body dynamics module to calculate a motion response spectrum of the blade root, so as to obtain the radial displacement speed and the radial displacement of the blade root;
comparing the calculated radial displacement speed and radial displacement of the root of the blade with the boundary condition of the installation blade of the jack-up platform ship, and considering that the jack-up ship can split the blade of the fan under the current sea condition when the calculated radial displacement speed and radial displacement of the root of the blade are smaller than the boundary condition;
step two, comparing the heave response of the lifting hook obtained by the dynamic analysis of the floating body of the crane ship to obtain a window period for installing the blades of the crane ship, wherein the crane ship can install the blades of the fan when the incident angle of waves is 30 degrees, 60 degrees, 75 degrees, 150 degrees and 165 degrees as shown in the table 4;
table 4.
The above embodiments are provided for illustrating the present invention and not for limiting the present invention, and various changes and modifications may be made by one skilled in the relevant art without departing from the spirit and scope of the present invention, and thus all equivalent technical solutions should be defined by the claims.
Claims (1)
1. A method for evaluating feasibility of split installation of wind turbine on a crane ship comprises the following steps: the method comprises the steps of firstly, judging whether a crane ship can be provided with a tower barrel and a cabin of a fan in a split mode; judging whether the crane ship can be provided with blades of the fan in a split mode or not; it is characterized in that the method comprises the steps of,
the process time comprises the following steps:
step one, a model of a crane ship is built in a hydrodynamic analysis module, PM spectrum is used for simulation, and wave parameters are input: the wave height and the wave period are calculated to obtain a motion amplitude response operator RAO (omega) of the crane ship;
the expression of the wave density profile is:
in the formula (1): s is S PM (ω) is a PM wave density spectrum; h S Is wave height; t (T) P Is the wave period; omega is the wave frequency;
substituting a motion amplitude response operator RAO (omega) into the floating body dynamics module for analysis to obtain a motion response spectrum of the vertical motion of the suspended object, thereby obtaining the speed, acceleration and displacement of the vertical motion of the suspended object;
calculating the inertia force of the suspended object according to the analyzed acceleration of the suspended object in vertical motion;
when the calculated inertial force of the suspended object is smaller than the safe load of the suspended steel cable given by a manufacturer, judging that the acceleration of the crane ship under the current sea condition meets the requirement of split installation of the tower barrel and the engine room;
when the calculated displacement of the vertical motion of the suspended object is smaller than the displacement amplitude of the vertical motion of the lifting hook obtained through experience, judging that the displacement of the motion of the crane ship under the current sea condition meets the requirements of split installation of the tower barrel and the cabin;
step four, adopting an explicit dynamics analysis module to analyze the contact of each section of tower barrel and the installed part at different inclination angles, namely establishing a tower barrel model of a fan in the explicit dynamics analysis module, setting the vertical movement speed of a hung object as the initial speed of hanging each section of tower barrel so as to simulate the installation process of each section of tower barrel, and calculating to obtain the maximum Van stress of each section of tower barrel and the installed part in the impact process of the butt joint moment; when the tower barrel is in butt joint with the installed part, the inclination angle is 0-180 degrees, and the corresponding inclination angle of the maximum Van stress is obtained by comparing Van stress of the tower barrel under different inclination angles, so that a relation curve of the Van stress and impact time under the current inclination angle is obtained; when the Van stress of the tower is smaller than the material yield limit of the tower in the impact time, the motion speed of the crane ship under the current sea condition is considered to meet the requirement of split installation of the tower; the method comprises the steps that an explicit dynamics analysis module is adopted to analyze the contact between a nacelle and an installed tower, namely, a nacelle model of a fan is built in the explicit dynamics analysis module, the vertical movement speed of a hung object is set to be the initial speed of the hanging nacelle, so that the installation process of the nacelle is simulated, the maximum Van stress of the impact process at the moment of butt joint of the nacelle and the installed tower is calculated, and a relation curve of the Van stress and the impact time is obtained; when the Van stress of the engine room in the impact time is smaller than the material yield limit of the engine room, the motion speed of the crane ship under the current sea condition is considered to meet the requirement of split installation of the engine room;
fifthly, checking the dead weight stability of the tower barrel; after hoisting of each section of tower section of thick bamboo is finished, before installing flange bolt, the lifting hook of hoist can loosen the hook, and the external force that the tower section of thick bamboo receives is wind load this moment, and wind load adopts formula (2) to calculate:
F w ＝C·Q·S·sinα (2)
in the formula (2), F w Is wind load; c is the shape factor of the tower; q is basic wind pressure; s is the windward area of the tower barrel; alpha is the angle between the wind direction and the axis of the tower;
when wind load acts on the tower, a overturning moment M is generated overt Overturning moment M overt Calculation using equation (3):
M overt ＝q·F w 2 /4 (3)
in the formula (3), M overt Is the overturning moment; q is the height of the tower;
when the wind load is applied, the dead weight of the tower barrel can generate anti-overturning moment M r Anti-overturning moment M r Calculation using equation (4):
M r ＝G·d (4)
in the formula (4), M r Is an anti-overturning moment; g is the gravity of the tower barrel; d is the horizontal position of the gravity center of the tower barrel;
definition of anti-capsizing moment M r And overturning moment M overt The ratio of (2) is the self-weight stability safety coefficient F s ；
When the self-weight stability safety factor F s When the self-weight stability safety coefficient is larger than the self-weight stability safety coefficient experience value, the self-weight stability of the tower under the current sea condition is considered to meet the requirement of split installation;
step six, under the current sea condition, when the speed, the acceleration and the displacement of the vertical movement of the tower barrel and the engine room simultaneously meet the installation requirement and the self-weight stability of the tower barrel also meets the requirement, the crane ship under the current sea condition is considered to be capable of carrying out split installation on the tower barrel and the engine room of the fan;
when the second flow is carried out, the method comprises the following steps:
firstly, establishing a model for installing blades of a self-elevating platform ship in an explicit dynamics module, and calculating the maximum radial displacement and the maximum radial displacement speed of the root of the blades under the action of wind load, thereby obtaining the boundary condition of the blades of a self-elevating platform ship installing fan under the current environmental condition;
calculating a motion amplitude response operator RAO (omega) of the crane ship by adopting a hydrodynamic analysis module;
substituting a motion amplitude response operator RAO (omega) of the crane ship into a floating body dynamics module to calculate a motion response spectrum of the blade root, so as to obtain the radial displacement speed and the radial displacement of the blade root;
and fourthly, comparing the calculated radial displacement speed and radial displacement of the root of the blade with the boundary condition of the blade of the self-elevating platform ship for installing the fan, and considering that the crane ship can be used for split installation of the blade of the fan under the current sea condition when the calculated radial displacement speed and radial displacement of the root of the blade are smaller than the boundary condition.
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