CN109723091B - Experimental device for measuring wave current load of three spud legs of drilling platform - Google Patents
Experimental device for measuring wave current load of three spud legs of drilling platform Download PDFInfo
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Abstract
The experimental device for measuring wave current load of three spud legs of the drilling platform comprises a water tank, a three spud leg scale model positioned in the water tank, a tool frame positioned above the water tank, a force measuring rod, a six-dimensional force sensor, a three-axis vibration acceleration sensor, a wave height sensor and a data processing unit. The experimental device takes the reduced scale model of the three spud legs of the self-elevating ocean platform as an experimental object, truly simulates the three spud leg structure of the actual ocean platform, and overcomes the defect of low application value of experimental results when cylindrical rod pieces are used for replacing truss spud legs as the experimental model; the experimental device is also provided with the three force measuring rods and the six-dimensional force sensor, so that the stress of each pile leg in the three pile leg model and the overall stress of the model can be obtained simultaneously in one experimental process, the experimental efficiency is improved, the synchronism of each data acquisition is well ensured, and data support is provided for analysis of pile group effect among three pile legs of the self-elevating platform.
Description
Technical Field
The invention belongs to the technical field of ocean engineering. More particularly, it relates to an experimental apparatus for measuring wave current load of three legs of a drilling platform.
Background
In recent years, with the importance of the nation on ocean energy development, the self-elevating platform is increasingly applied by virtue of the advantages of strong positioning capability, strong environmental adaptability and the like. However, due to the complexity of the ocean environment, the ocean environment is subjected to loads such as wind, sea waves, ocean currents, floating ice and the like, wherein the sea wave load and the ocean current load are the most common environmental loads, and play a very important role in the manufacturing cost, the stability and the service life of the platform. Therefore, accurate wave flow load calculation is particularly important for design and manufacture of a platform, strength evaluation and structural optimization.
The conventional wave flow load experiment has two main experimental methods: the method takes a plurality of pitches of single piles as experimental objects, but the method cannot truly simulate the three-pile leg structure of the ocean platform, and ignores pile-group effect (pile-group effect: mutual influence among piles) among piles of the ocean platform; and secondly, the pile group effect among the pile legs is analyzed by replacing the pile legs with the cylindrical rod pieces, the truss structure of the pile legs is omitted, and the application value of the experimental result is low. Therefore, the invention provides the experimental device and the method for performing pile group effect analysis by taking the reduced scale model of the three piles of the self-elevating ocean platform as an experimental object, can collect all pile leg stress and platform overall stress simultaneously, provides technical support for deducing hydrodynamic coefficients of truss pile leg structures and analyzing pile group effect among piles, and has important theoretical significance and research value.
Disclosure of Invention
The invention aims to provide an experimental device for measuring wave flow load of three piles of a drilling platform, which realizes synchronous acquisition of respective stress and overall stress of three piles, truly simulates the three piles structure of an actual ocean platform, avoids errors caused by replacing a truss structure with cylindrical rods, ensures data acquisition synchronism and provides data support for derivation of hydrodynamic coefficients of the truss piles structure and analysis of pile group effect.
An experimental device for measuring wave current load of three spud legs of a drilling platform comprises a water tank, a three spud leg scale model positioned in the water tank, a tool frame positioned above the water tank, a force measuring rod, a six-dimensional force sensor, a three-axis vibration acceleration sensor, a wave height sensor and a data processing unit;
the lower ends of the three-pile leg scale model extend to the position below the water surface of the pool; and swings in the pool under external force;
the force measuring rod is vertically fixed at the upper end of the three-pile leg scale model and is used for measuring bending moment generated after the three-pile leg scale model receives wave current load; the outer surface of the force measuring rod is provided with a resistance strain gauge group which is used for measuring the force measuring rod strain signal received by the single pile leg and transmitting the force measuring rod strain signal to the data processing unit; the upper end of the force measuring rod is provided with a connecting plate;
the lower end of the six-dimensional force sensor is fixed at the center of the connecting plate, and the upper end of the six-dimensional force sensor is connected with the tool frame and is used for measuring environmental load signals born by the three-pile leg scale model and transmitting the environmental load signals to the data processing unit;
the triaxial vibration acceleration sensor is fixed on the connecting plate and is used for measuring vibration acceleration time domain response signals of the three-leg scale model and transmitting the vibration acceleration time domain response signals to the data processing unit;
the wave height sensor is arranged in the water tank, the lower end of the wave height sensor vertically extends to the lower side of the water surface and is not contacted with the bottom surface of the water tank, and the wave height sensor is used for measuring a timely wave height signal of wave flow in the water tank and transmitting the timely wave height signal to the data processing unit.
Preferably, the pool is used for simulating the ocean environmental load of ocean waves, ocean currents and the like.
Preferably, the data processing unit comprises a data acquisition device and a data display device; the data acquisition equipment converts the acquired force measuring rod strain signal, environment load signal, vibration acceleration time domain response signal and timely wave height signal into a format compatible with the data display equipment, transmits the format to the data display equipment for processing, and then displays the format through the data equipment.
Preferably, the three-pile leg scale model comprises three single-pile legs, and the three single-pile legs are sequentially connected to form a column structure, and the cross section of the column structure is triangular.
Preferably, the upper ends of the three single pile legs are respectively vertically fixed with a force measuring rod.
Preferably, the connecting plate is a triangular connecting plate, and the upper ends of the three force measuring rods are respectively fixed at three corners of the triangular connecting plate.
Preferably, the set of resistive strain gages comprises two sets of strain gages; more preferably, each of the two sets of strain gages comprises two strain gages, and the two strain gages are fixed in the force-measuring rod member by a half-bridge type paster method with an included angle of 90 degrees.
Preferably, the distance between the two sets of strain gages on each load cell is equal. Preferably, the data processing unit comprises a data acquisition device and a data display device; the data acquisition equipment converts the acquired force measuring rod strain signal, environment load signal, vibration acceleration time domain response signal and timely wave height signal into a format compatible with the data display equipment, transmits the format to the data display equipment for processing, and then displays the format through the data equipment.
Preferably, the tool rack is of a U-shaped structure, and two ends of the tool rack are respectively fixed at the edge of the upper end of the water tank.
The beneficial effects of the invention are as follows:
1. the experimental device provided by the invention takes the reduced scale model of the three spud legs of the self-elevating ocean platform as an experimental object, truly simulates the three spud leg structure of the actual ocean platform, and overcomes the defect of low application value of experimental results when cylindrical rod pieces are used for replacing truss spud legs as the experimental model.
2. The experimental device adopts the acquisition mode of simultaneously arranging the three force measuring rods and the six-dimensional force sensor, so that the stress of each pile leg in the three pile leg model and the overall stress of the model can be simultaneously acquired in one experimental process, the experimental efficiency is greatly improved, the synchronism of each data acquisition is well ensured, and the data support is provided for analysis of pile group effect among three pile legs of the jack-up platform.
Drawings
The following description of the preferred embodiments of the present invention refers to the accompanying drawings.
Fig. 1 is a front view of an experimental device for measuring wave flow load of three piles of a drilling platform.
Fig. 2 is a perspective view of the three-leg scale model of the present invention.
Wherein: the three-pile leg scale model comprises a pool 1, a three-pile leg scale model 2, a force measuring rod 3, a resistance strain gauge set 4, a three-axis vibration acceleration sensor 5, a six-dimensional force sensor 6, a wave height sensor 7, a data acquisition device 8, a data display device 9, a tool frame 10 and a connecting plate 11.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be described in detail with reference to preferred embodiments and accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
In one embodiment of the invention, referring to fig. 1, an experimental device for measuring wave current load of three legs of a drilling platform comprises a water tank 1, a three-leg scale model 2 positioned in the water tank, a tool frame 10 positioned right above the water tank 1, a force measuring rod 3, a six-dimensional force sensor 6, a three-axis vibration acceleration sensor 5, a wave height sensor 7 and a data processing unit; the data processing unit comprises a data acquisition device 8 and a data display device 9; the tool rack 10 is of a U-shaped structure, and two ends of the tool rack are respectively fixed at the edge of the upper end of the pool 1.
The three-pile leg scale model 2 comprises three single pile legs which are sequentially connected to form a column structure, and the cross section of the column structure is triangular. The lower ends of the three-leg scale models extend to the lower part of the water surface of the water tank, and keep a distance of about 20 cm from the bottom surface of the water tank 1; the three-pile leg reduced scale model 2 can horizontally move in multiple directions in the pool under external acting force; the force measuring rods 3 are vertically fixed at the upper ends of three single pile legs respectively and are used for measuring bending moment generated after the three pile leg scale model 2 receives wave flow load; the outer surface of the force measuring rod 3 is provided with a resistance strain gauge group 4 which is used for measuring the strain signal of the force measuring rod 3 received by the single pile leg and transmitting the signal to data acquisition equipment; the resistance strain gauge group 4 comprises two groups of strain gauges, and the distances between the two groups of strain gauges on each force measuring rod 3 are equal; the upper ends of the force measuring rods 3 are provided with connecting plates 11, the connecting plates 11 are triangular connecting plates, and the upper ends of the three force measuring rods 3 are respectively fixed at three corners of the triangular connecting plates 11; the lower end of the six-dimensional force sensor 6 is fixed at the center of the connecting plate 11 through a bolt, and the upper end of the six-dimensional force sensor is connected with the tool frame 10 and is used for measuring environmental load signals received by the three-pile leg scale model 2 and transmitting the environmental load signals to the data acquisition equipment 8; the triaxial vibration acceleration sensor 5 is fixed on the connecting plate 11 and is used for measuring vibration acceleration time domain response signals of the three-leg scale model 2 and transmitting the vibration acceleration time domain response signals to the data acquisition equipment; the wave height sensor 7 is vertically fixed in the water tank 1, and the lower end extends to the lower side of the water surface and is not contacted with the bottom surface of the water tank 1, and is used for measuring a timely wave height signal of wave flow in the water tank 1 and transmitting the signal to the data acquisition equipment 8. The data acquisition device 8 converts the acquired strain signal, environmental load signal, vibration acceleration time domain response signal and timely wave height signal of the force measuring rod into a format compatible with the data display device, transmits the format to the data display device 9 for processing, and then displays the format through the data display device 9.
In the embodiment of the invention, each of the two groups of strain gages comprises two strain gages, and the two strain gages are fixed in the force measuring rod 3 by adopting a half bridge type paster method with an included angle of 90 degrees.
In the embodiment of the invention, the triangular connecting plate 11 is an equilateral triangular connecting plate 11 obtained by scaling according to the distance between three piles of an actual ocean platform, and the six-dimensional force sensor 6 above is positioned at the center of the connecting plate 11.
In the embodiment of the present invention, in order to improve the accuracy of measurement, the surface of the force-measuring rod 3 is degreased and filings of iron are removed before the resistance strain gauge set 4 is fixed to the surface of the force-measuring rod 3, and a waterproof treatment is performed after the resistance strain gauge set 4 is fixed.
In the embodiment of the invention, the upper end and the lower end of the force measuring rod 3 are respectively connected with the three-pile leg scale model 2 and the connecting plate 11 below the six-dimensional force sensor 6 through flange plates.
In another embodiment of the invention, the connecting plate under the six-dimensional force sensor 6 is an equilateral triangle connecting plate 11 which is obtained by scaling according to the distance between three piles of the actual ocean platform; the six-dimensional force sensor 6 is located in the center of the equilateral triangle connecting plate 11.
The invention can read out the strain data of two measuring points on the force measuring rod 3, the integral environmental load data of the three-pile leg scale model 2, the vibration acceleration time domain response data of the integral model and the timely wave height data of waves in a water pool through the data display equipment.
According to the knowledge of the mechanics of materials, the bending moment of the force measuring rod can be obtained, as shown in (formula 1):
wherein: m is bending moment (N/M);
e is the elastic modulus (MPa) of the material of the force measuring rod;
epsilon is the strain value of the measuring point;
d, the outer diameter of the force measuring rod;
d the inner diameter of the force measuring rod;
and because of M 1 ＝F·L 1 ,M 2 ＝F·L 2 Therefore Δm=f·Δl. Therefore, the independent stress of each pile leg is obtained as follows:
wherein: Δl is the vertical distance between two sets of strain gages on the force lever member, the distances between two sets of strain gages on the three force levers being equal.
Delta epsilon is the difference of the strain values of two measuring points on the measuring rod 3 (the two measuring points on the measuring rod refer to the positions where two groups of strain gauges are arranged on the measuring rod and are used for measuring the strain signals of the measuring rod 3 received by a single pile leg).
And comparing the stress of each pile leg in the three-pile leg scale model 2 with the stress of the single-pile leg model under the same working condition, and analyzing the pile group effect among the three pile legs under the action of ocean current and ocean waves.
The terms "upper", "lower", "left", "right" and the like used herein to describe orientations are used for convenience in the description based on the orientation depicted in the drawings, and may vary in actual devices depending on the manner in which the devices are placed.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (5)
1. The experimental device for measuring the wave current load of the three spud legs of the drilling platform is characterized by comprising a water tank, a three spud leg scale model positioned in the water tank, a tool frame positioned above the water tank, a force measuring rod, a six-dimensional force sensor, a three-axis vibration acceleration sensor, a wave height sensor and a data processing unit;
the lower ends of the three-pile leg scale model extend to the position below the water surface of the pool; and swings in the pool under external force;
the force measuring rod is vertically fixed at the upper end of the three-pile leg scale model and is used for measuring bending moment generated after the three-pile leg scale model receives wave current load; the outer surface of the force measuring rod is provided with a resistance strain gauge group which is used for measuring the force measuring rod strain signal received by the single pile leg and transmitting the force measuring rod strain signal to the data processing unit; the upper end of the force measuring rod is provided with a connecting plate;
the lower end of the six-dimensional force sensor is fixed at the center of the connecting plate, and the upper end of the six-dimensional force sensor is connected with the tool frame and is used for measuring environmental load signals born by the three-pile leg scale model and transmitting the environmental load signals to the data processing unit;
the triaxial vibration acceleration sensor is fixed on the connecting plate and is used for measuring vibration acceleration time domain response signals of the three-leg scale model and transmitting the vibration acceleration time domain response signals to the data processing unit;
the wave height sensor is arranged in the water tank, the lower end of the wave height sensor vertically extends to the lower side of the water surface and is not contacted with the bottom surface of the water tank, and the wave height sensor is used for measuring a timely wave height signal of wave flow in the water tank and transmitting the timely wave height signal to the data processing unit;
the three-pile leg reduced scale model comprises three single-pile legs, wherein the three single-pile legs are sequentially connected to form a column structure, and the cross section of the column structure is triangular;
force measuring rods are vertically fixed at the upper ends of the three single pile legs respectively;
the connecting plate is a triangular connecting plate, and the upper ends of the three force measuring rods are respectively fixed at three corners of the triangular connecting plate.
2. The experimental setup in accordance with claim 1, wherein the data processing unit comprises a data acquisition device and a data display device; the data acquisition equipment converts the acquired force measuring rod strain signal, environment load signal, vibration acceleration time domain response signal and timely wave height signal into a format compatible with the data display equipment, transmits the format to the data display equipment for processing, and then displays the format through the data display equipment.
3. The assay device according to any one of claims 1-2 wherein the set of resistive strain gages comprises two sets of strain gages; each of the two groups of strain gages comprises two strain gages, and the two strain gages are fixed in the force measuring rod piece by adopting a half-bridge type paster method with an included angle of 90 degrees.
4. A test device according to claim 3, wherein the distance between the two sets of strain gages on each load cell is equal.
5. The experimental device according to claim 1, wherein the tool rack has a U-shaped structure, and two ends of the tool rack are respectively fixed at the upper edge of the pool.
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| JP2000249623A (en) * | 1999-02-26 | 2000-09-14 | Hitachi Zosen Corp | Wind and wave experimenting apparatus |
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