CN112146841B - Large-scale structure water power coefficient measuring device and measuring method thereof - Google Patents
Large-scale structure water power coefficient measuring device and measuring method thereof Download PDFInfo
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- CN112146841B CN112146841B CN201910577955.6A CN201910577955A CN112146841B CN 112146841 B CN112146841 B CN 112146841B CN 201910577955 A CN201910577955 A CN 201910577955A CN 112146841 B CN112146841 B CN 112146841B
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- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
The invention provides a device and a method for measuring the hydrodynamic coefficient of a large structure, wherein the device comprises: an experimental water tank; the supporting frame is arranged on the experimental water tank; the lead screw loading and driving assembly comprises a transverse lead screw, a vertical lead screw and a driving assembly for driving the transverse lead screw and the vertical lead screw, the transverse lead screw is connected to the supporting frame, and the lower part of the vertical lead screw is connected with the manifold model through a connecting mechanism; the driving assembly drives the screw rod to drive the manifold model to realize translation and oscillation motion simulation of the manifold in the experiment water tank along the X direction, the Y direction and the Z direction according to the set requirements; and the measuring system comprises a strain gauge connected to the lead screw and the driving assembly, a sensor and a data acquisition device connected with the sensor or the strain gauge. The measuring device provides an experimental device for hydrodynamic analysis and calculation of the lowering and installation of the large-sized structure under the deepwater oil and gas development, and accurately predicts and simulates the motion laws of the large-sized structure such as motion response, dynamic response and the like in the lowering and installation process.
Description
Technical Field
The invention relates to the technical field of marine petroleum machinery, in particular to a device and a method for measuring the hydraulic coefficient of a large structure.
Background
With the increasing demand of China on energy, the development of underwater oil gas in China gradually moves from shallow water to deep water and even ultra-deep sea areas.
Large structures such as Christmas trees, manifolds and the like are used as core equipment of the underwater production system, and are extremely important to control and operation of the process of lowering and installing the large structures. The motion response and the dynamic response of the large-scale structure in the lowering process need to be predicted, the hydrodynamic force borne by the large-scale structure is analyzed and calculated, and the load borne by the lowered structure is accurately calculated, so that the range of applicable ships is expanded, and the operation safety coefficient is improved.
The current measurement of hydrodynamic coefficients (damping coefficient, additional mass coefficient) has several problems: (1) at present, the damping coefficient of an underwater large structure is measured by adopting a mode that a boat drags a model at a fixed speed, so that the incident flow area of the underwater large structure cannot be maintained, the precision of the measured hydrodynamic coefficient is low, and the actual engineering is easily misled. (2) At present, the additional mass coefficient is mainly measured by connecting four corners of a manifold model through springs and measuring force and speed through vibration and monitoring, the operation flow of the method in the process of switching between heave, sway and surging is too complicated, a fixed steel strand and a U-shaped buckle of the model need to be unfastened, and the steel strand and the model are fixed through the U-shaped buckle to adapt to other directions, so that the method for measuring the hydrodynamic coefficient is difficult to be well combined in the aspects of economy and accuracy. Therefore, it is necessary to develop an accurate and efficient apparatus for measuring the hydraulic coefficient of large-scale structure.
Disclosure of Invention
The device provides an experimental device for hydrodynamic analysis and calculation of the lowering and installation of the large-scale structure under the deep water oil and gas development water, accurately predicts and simulates the motion laws of the large-scale structure such as motion response, power response and the like in the lowering and installation process through the measured large-scale structure hydrodynamic coefficient, and provides theoretical support for the safe, accurate installation and lowering of the large-scale structure.
In order to achieve the above object, in one aspect, the present invention provides a large structure hydrokinetic coefficient measuring device, including:
an experimental water tank;
the supporting frame is arranged on the experimental water tank;
the lead screw loading and driving assembly comprises a transverse lead screw, a vertical lead screw and a driving assembly for driving the transverse lead screw and the vertical lead screw, the transverse lead screw is connected to the supporting frame, and the lower part of the vertical lead screw is connected with the manifold model through a connecting mechanism; the driving assembly drives the screw rod to drive the manifold model to realize translation and oscillation motion simulation of the manifold in the experiment water tank along the X direction, the Y direction and the Z direction according to the set requirements; and
and the measuring system comprises a strain gauge connected to the lead screw and the driving assembly, a sensor and a data acquisition device connected with the sensor or the strain gauge.
In one embodiment, the support frame comprises a main body formed by connecting support legs, cross beams and longitudinal beams, and reinforcing beams connected to the support legs on two sides of the water tank and longitudinal support beams arranged on the main body, wherein the longitudinal support beams, the transverse screw rods and the vertical screw rods are arranged perpendicular to each other;
the transverse screw rod is connected with the longitudinal support beam through a transverse sliding block;
the vertical screw rod is connected with the longitudinal support beam through a connecting piece, and the connecting piece enables the vertical screw rod to only vertically move relative to the longitudinal support beam;
two cross beams of the supporting frame are provided with guide rails for the transverse movement of the longitudinal supporting beam, and two ends of the longitudinal supporting beam are provided with moving wheels.
In one embodiment, the transverse screw and the vertical screw are both ball screws, and the longitudinal beam is provided with the transverse screw, and two ends of the transverse screw are connected with and fixed with the transverse screw through bearings.
In one embodiment, includes: the vertical lead screw is provided with a thrust ball bearing to bear the weight of the manifold and prevent the manifold from overturning.
In one embodiment, the support frame is welded using steel frames;
the driving assembly comprises a transverse motor for driving a transverse screw rod, a stepping motor for driving a vertical screw rod, and a pulse generator and a motor driver for realizing oscillation, wherein the transverse motor is connected with the transverse motor through a secondary gear reducer, the motor driver is connected with a power supply, and the stepping motor is connected to the longitudinal supporting beam;
the motor driver, the power supply, the pulse generator and the transverse motor are all arranged on the outer side of one end of the transverse lead screw, and are used for driving the transverse lead screw to translate and provide power for the oscillation of the manifold model in water and air.
In another aspect, the present invention further provides a method for measuring the hydrodynamic coefficient of a large structure, which uses the experimental apparatus as described above and includes the following steps:
preparing before testing;
measuring through a measuring device, and acquiring resistance coefficients of the underwater manifold in the X direction, the Y direction and the Z direction according to a Morrison equation;
the vertical lead screw is enabled to do sinusoidal oscillation motion in a certain direction by giving a fixed transmission speed to a motor in the measuring device, an additional mass value is obtained by measurement, and an additional mass coefficient is obtained by calculation according to a formula.
In one embodiment, obtaining the drag coefficient in the X direction comprises the steps of:
setting a fixed horizontal movement speed value Vr for the transverse screw rod, so that the manifold makes an upstream motion along the X direction in the water tank at the fixed value Vr;
the total resistance F of the manifold in the X direction is measured through a strain gauge on a transverse lead screw DX Obtaining the flow area A of the manifold in the X direction through model size measurement p ；
By the Morrison equation F DX ＝0.5ρC DX A P V 2 r Calculating to obtain a resistance coefficient C in the X direction DX 。
In one embodiment, when the resistance coefficient in the Y direction or the Z direction is obtained, the manifold model is rotated by 90 ° around the vertical lead screw until the incident flow surface changes to the Y direction or the Z direction, and then the resistance coefficient in the Y direction or the Z direction is measured according to a method corresponding to the measurement of the resistance coefficient in the X direction.
In one embodiment, acquiring the additional mass in the Z direction comprises the steps of:
a fixed transmission speed is set for the motor, so that the vertical screw rod can make a speed V in the vertical direction 2 The acceleration of the manifold in the Z direction is a obtained by carrying out first-order derivation on the movement speed 2 A ω cos ω t, where a is the maximum movement speed of the manifold and ω is the oscillation frequency;
the total resistance F of the underwater manifold at different moments t is measured in real time by strain gauges on a lead screw zt According to Newton's second law F 2t ＝m 2t *a 2t And manifold acceleration a 2t The manifold additional mass m at the respective time t can be obtained as a ω cos ω t 2t That is, an additional quality value of the manifold at time t is obtained, and m corresponding to a time step delta t of a plurality of periods is counted 2t And calculating the average value to obtain the additional mass value M of the manifold in the Z direction 2t 。
In one embodiment, M is added to the average quality value 2t By dimensionless
After treatment, obtaining an additional mass coefficient of the manifold in the Z direction, wherein rho is the fluid density, and V is the manifold volume;
the method corresponding to the Z direction can be adopted to measure the additional mass coefficient lambda of the manifold in the X and Y directions 0 And λ 1 。
Compared with the prior art, the invention has the advantages that:
the invention solves the problems of low measurement precision, complex experimental operation, high cost and the like of the traditional mode, and establishes the device for measuring the hydraulic coefficient of the large structure. On the basis of guaranteeing the high accuracy of experimental result, improve experimental efficiency, reduce the experiment cost. Motion laws such as motion response, dynamic response and the like in the process of lowering and installing the underwater large-scale structure are accurately predicted and simulated, and safe and accurate installation and lowering of the underwater large-scale structure are achieved. The efficiency and the safety factor of deep-water offshore operation are improved, and the operation cost and the risk are reduced.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:
fig. 1 is a schematic perspective view of a device for measuring the hydraulic coefficient of a large structure according to an embodiment of the present invention.
Fig. 2 shows a top view of the measuring device in fig. 1.
Fig. 3 shows a front view of the measuring device in fig. 1.
Fig. 4 is a schematic structural view of the vertical screw and the connecting structure in fig. 1.
Fig. 5 shows a side view of fig. 4.
Fig. 6 is a schematic view of the disassembled structure in fig. 4.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
The inventor notices in the invention process that when the existing method of dragging the model by a boat at a fixed speed to measure the hydrodynamic coefficient is adopted, the incident flow area in water cannot be maintained, so that the accuracy of the measured hydrodynamic coefficient is not high, and the misleading effect on the actual engineering is realized. At present, the method for connecting the four corners of a manifold model by using springs is mainly adopted for measuring the additional mass coefficient, and the operation flow of the method is too complicated in the process of switching between heave, sway and surging.
In view of the above disadvantages, embodiments of the present invention provide an apparatus and a method for measuring the hydraulic coefficient of a large structure, which will be described in detail below.
Fig. 1 to 3 are schematic structural diagrams of different angles of one embodiment of the device for measuring the hydraulic coefficient of a large structure according to the present invention. In this embodiment, the apparatus for measuring the hydrodynamic coefficient of a large structure of the present invention mainly includes: the device comprises an experimental water tank 1, a supporting frame 2, a lead screw loading and driving assembly and a measuring system. The design standard of the experimental water tank 1 is that the length and width of the general experimental water tank 1 is 8 to 15 times of the length and width of the manifold model, and the height of the general experimental water tank 1 is 4 to 8 times of the manifold model. In a preferred embodiment, the length and width of the test tank 1 are ten times the length and width of the manifold model 14, respectively, and the height of the test tank 1 is five times the height of the manifold model 14. The main part of braced frame 2 is connected in experiment water tank 1 top, and braced frame 2's supporting leg is located the both sides of experiment water tank 1. Here, enough water space is reserved for eliminating the influence of the water tank boundary on the test piece. The measuring system includes a strain gauge 13, a sensor and a data acquisition device (or called a data acquisition system). The data acquisition device is mainly responsible for the collection and the storage of all experimental data.
In one embodiment, as shown in fig. 1 to 3, the support frame 2 is mainly composed of four support legs, two cross beams 5 and two longitudinal beams to form a support body crossing the experimental water tank 1. The supporting body is positioned on two sides of the experimental water tank 1 in the length direction, and a reinforcing beam 3 is arranged between the two supporting legs on the two sides of the length direction. The supporting body is also provided with a supporting beam 6, the two ends of the supporting beam 6 are connected with moving wheels 7, and two beams 5 of the supporting body are provided with guide rails for the moving wheels 7 to move.
In one embodiment, as shown in fig. 1 to 6, the transverse screw 8 is connected at both ends to the longitudinal beams of the main body of the support frame 2 by means of bearings 4. One end of the transverse screw 8 extends out of the corresponding longitudinal beam and is connected with a transverse motor 10 through a speed reducer 16 (adopting a secondary gear speed reducer) device. The transverse screw 8 is connected with a transverse moving slide block 17 which is fixedly connected with the middle part of the supporting beam 6. The middle of the supporting beam 6 is connected with a square pipe barrel 19 through a connecting piece. The lower end of a vertical screw 12 in the pipe barrel is connected with a manifold model 14 through a directional structure 20, a vertical suspension rod 21 and a 90-degree rotatable structure 22. Under the driving action of the transverse motor 10, the acting force of the transverse lead screw 8 causes the transverse moving slide block 17 to carry the manifold model 14 connected below the supporting cross beam 6 to move along the X direction.
In one embodiment, as shown in fig. 1-6, strain gages 13 are mounted on the lower end of the vertical hanger bar 21 near the manifold model 14. The strain gauge 13 on the vertical suspender 21 is mainly used for measuring the stress condition of the test piece in the process of making X, Y, Z-direction translation in the experiment water tank 1 in the process of measuring the damping coefficient of the underwater manifold. The stress conditions include frictional resistance and differential pressure resistance, collectively referred to as drag force.
In one embodiment, as shown in fig. 1-6, the lower end of the vertical boom 21 is connected to the manifold model 14 by a 90 ° swivel structure 22, so that the manifold model 14 is simply rotated 90 ° and then the Y-direction motion parameter measurement is performed in the same way as the X-direction motion parameter measurement.
In one embodiment, as shown in fig. 1 to 6, a square tube 19 is fixed on the supporting beam 6, the upper end of the vertical lead screw 12 is connected with a stepping motor 18, the lower end of the vertical lead screw 12 is connected with a square orientation structure 20, and the vertical lead screw 12 moves longitudinally under the driving action of the stepping motor 18 to drive the square orientation structure 20 to move in the square tube without rotating, so that the manifold model 14 connected below through a vertical suspender 21 can only measure the motion parameter in the Z direction.
In a preferred embodiment, as shown in fig. 1 to 3, the vertical screw 12 and the horizontal screw 8 both use ball screws, so as to reduce the influence of friction on the measurement result to the maximum extent and improve the measurement accuracy. The bearing 4 is preferably a thrust ball bearing, which not only can better bear the weight of the manifold model 14, but also can prevent the manifold model 14 from overturning under the influence of the rotation of the vertical lead screw 12 and the transverse lead screw 8 in the test process.
In one embodiment, as shown in fig. 1 to 3, the main constituent parts of the support frame 2, such as the support legs, the cross beams 5, the longitudinal beams, the reinforcing beams 3, and the support cross beams 6, are all steel frames. The supporting legs, the cross beams 5, the longitudinal beams and the reinforcing beams 3 are fixed with each other in a welding mode to ensure stability. The supporting frame 2 and the supporting cross member 6 serve to support and stabilize the ball screws in the lateral and vertical directions. The drive assembly comprises, in addition to the traverse motor 10 and the stepping motor 18, a motor driver 9 and a pulse generator 11. The motor driver 9 and the pulse generator 11 are arranged close to the transverse motor 10 and on the same side of the support frame 2. The motor drive 9 is also connected to a motor drive power supply 15. The driving assembly ball screw enables the manifold model 14 to make X, Y, Z-directional translation in the experimental water tank 1 and provides power for the oscillation of the manifold model 14 in water and air. The basic working principle is as follows: the motion function v of manifold oscillation is set to be cos (ω t), the pulse generator 11 is utilized to send the motion law to the motor driver 9 in the form of pulse signals, the signals drive the motor to rotate by a fixed angle according to the set direction, the angular displacement can be controlled by controlling the number of pulses, and the rotating speed and acceleration of the motor can be controlled by controlling the pulse frequency, so that the purposes of positioning and speed regulation are achieved.
On the other hand, the invention also provides a method for measuring the hydrodynamic coefficient of the large-scale structure. The method employs a large structure hydrokinetic coefficient measuring device as in any of the above embodiments.
In one embodiment, the large structure hydrokinetic coefficient measuring method comprises the steps of:
preparing before testing;
measuring through an experimental device, and acquiring resistance coefficients of the underwater manifold in the X direction, the Y direction and the Z direction according to a Morrison equation;
the screw rod is enabled to do sinusoidal oscillation motion in a certain direction through a fixed transmission speed of a motor in the experimental device, an additional mass value is obtained through measurement, and an additional mass coefficient is obtained through calculation according to a formula.
In one embodiment, the pre-test preparation in the measurement method of the present invention includes: the test equipment is connected in place in sequence, the water tank is filled with water, and the water surface is guaranteed to be static and free of fluctuation. An acceleration sensor is fixed at the bottom of the manifold model 14 according to requirements, and a force measuring strain gauge 13 or a sensor is arranged on the vertical lead screw 12. The manifold model 14 is connected and suspended at the lower end of the vertical screw 12, and the orientation posture of the manifold model 14 is adjusted and then fixed to keep the manifold model stationary. And adjusting the height of the bottom of the model from the water surface, ensuring the bottom of the test piece to be parallel to the water surface as much as possible, and finally opening a dynamic signal analyzer for initialization. Then, the manifold model 14 for experiment is lifted up to a specified position of the support frame 2 in the vertical direction (or the vertical direction), and the release of the manifold model 14 for experiment is started after the measurement system is normally debugged.
In an embodiment of the invention, the drag coefficients of the manifold in the X, Y and Z directions are measured primarily. The method for measuring the hydraulic coefficient of a large structure according to the present invention will be described in detail below, taking the measurement of the resistance coefficient in the X direction as an example.
In one embodiment, obtaining the drag coefficient in the X direction essentially comprises the steps of:
a fixed horizontal moving speed value Vr is set for the transverse screw 8, so that the manifold (namely the manifold model 14) performs upstream motion along the X direction in the water tank at a fixed value Vr;
the total resistance F of the manifold in the X direction is measured through a strain gauge 13 on the screw rod DX Obtaining the flow area A of the manifold in the X direction by measuring the size of the model p ；
By Morrison equation F DX ＝0.5ρC DX A P V 2 r Calculating to obtain a resistance coefficient C in the X direction DX 。
In one embodiment, when the Y-direction or Z-direction drag coefficient is obtained, the manifold model 14 is rotated by 90 ° around the screw until the incident flow surface changes to the Y-direction or Z-direction, and then the Y-direction or Z-direction drag coefficient is measured according to a method corresponding to the method for measuring the X-direction drag coefficient.
In the measuring method of the invention, the parameters to be measured are mainly the resistance coefficient of the manifold and the additional mass coefficient of the manifold. The following description will take an example of obtaining the additional mass coefficient in the Z direction. The method for acquiring the additional mass coefficient in the Z direction mainly comprises the following two steps: acquiring additional mass in the Z direction; and secondly, acquiring an additional mass coefficient of the manifold in the Z direction according to the additional mass in the Z direction obtained by measurement.
In one embodiment, acquiring the additional mass in the Z-direction comprises the steps of:
the stepping motor 18 is set to a fixed drive speed such that the vertical feed screw 12 performs a speed V in the vertical direction 2 The acceleration of the manifold in the Z direction is a obtained by carrying out first-order derivation on the movement speed 2 A ω cos ω t, where a is the maximum movement speed of the manifold and ω is the oscillation frequency.
The total resistance F of the underwater manifold at different moments t is measured in real time by strain gauges on a lead screw 2t According to Newton's second law F 2t ＝m 2t *a 2t And manifold acceleration a 2t The manifold additional mass m at the respective time t can be obtained as a ω cos ω t 2t I.e. obtaining an additional quality value of the manifold at the time t, and counting m corresponding to the time step delta t of a plurality of periods 2t And calculating the average value to obtain the additional mass value M of the manifold in the Z direction 2t 。
In one embodiment, M is added to the average quality value 2t By dimensionless
And obtaining an additional mass coefficient of the manifold in the Z direction after processing, wherein rho is the fluid density, and V is the manifold volume.
In addition, the method corresponding to the Z direction can be adopted to measure the additional mass coefficient lambda of the manifold in the X and Y directions 0 And λ 1 。
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all alterations and/or modifications that fall within the scope of the invention, and that all alterations and/or modifications made to the embodiment in accordance with the present invention are intended to be embraced therein.
Claims (4)
1. A method for measuring the hydraulic coefficient of a large structure using a measuring apparatus, the large structure being a manifold, the measuring apparatus comprising:
an experimental water tank;
the supporting frame is arranged on the experimental water tank;
the lead screw loading and driving assembly comprises a transverse lead screw, a vertical lead screw and a driving assembly for driving the transverse lead screw and the vertical lead screw, the transverse lead screw is connected to the supporting frame, and the lower part of the vertical lead screw is connected with the manifold model through a connecting mechanism; the driving assembly drives a screw rod to drive the manifold model to realize translation and oscillation motion simulation of the manifold model in the experiment water tank along the X direction, the Y direction and the Z direction according to the set requirements; and
the measuring system comprises a strain gauge connected with the lead screw loading and driving component and a data acquisition device connected with the strain gauge,
wherein, the supporting frame comprises a main body formed by connecting supporting legs, cross beams and longitudinal beams, reinforcing beams connected on the supporting legs at two sides of the experimental water tank, and a longitudinal supporting beam arranged on the main body, the longitudinal supporting beam, a transverse screw rod and a vertical screw rod are arranged in a mutually vertical way, the transverse screw rod is connected with the longitudinal supporting beam through a transverse sliding block, the vertical screw rod is connected with the longitudinal supporting beam through a connecting piece, the connecting piece enables the vertical screw rod to only do vertical movement relative to the longitudinal supporting beam, guide rails for the transverse movement of the longitudinal supporting beam are arranged on the two cross beams of the supporting frame, moving wheels are arranged at two ends of the longitudinal supporting beam, the supporting frame is formed by welding steel frames,
the driving assembly comprises a transverse motor for driving a transverse screw, a stepping motor for driving a vertical screw, and a pulse generator and a motor driver for realizing oscillation, the transverse motor is connected with the transverse screw through a secondary gear reducer, the motor driver is connected with a power supply, the stepping motor is connected to the longitudinal supporting beam, the motor driver, the power supply, the pulse generator and the transverse motor are all arranged on the outer side of one end of the transverse screw, the transverse screw is driven to translate and provide power for the oscillation of the manifold model in water and air,
the method comprises the following steps:
preparing before testing;
measuring through a measuring device, and acquiring resistance coefficients of the manifold model in the X direction, the Y direction and the Z direction according to a Morrison equation;
the vertical lead screw is enabled to do sinusoidal oscillation motion in a certain direction by giving a fixed transmission speed to a stepping motor in the measuring device, an additional mass value is obtained by measurement, an additional mass coefficient is obtained by calculation according to a formula,
the method for acquiring the resistance coefficient in the X direction comprises the following steps:
setting a fixed horizontal moving speed value Vr for the transverse screw rod, so that the manifold model makes an upstream motion along the X direction in the experimental water tank at the fixed value Vr;
measuring the total resistance F of the manifold model in the X direction through strain gauges on a transverse screw rod DX Obtaining the incident flow area A of the manifold model in the X direction through model size measurement p ；
By Morrison equation F DX ＝0.5ρC DX A P V 2 r Calculating to obtain a resistance coefficient C in the X direction DX Where ρ is the fluid density;
when the resistance coefficient in the Y direction or the Z direction is obtained, the manifold model rotates for 90 degrees around the vertical lead screw until the incident flow surface is changed into the Y direction or the Z direction, then the resistance coefficient in the Y direction or the Z direction is measured according to the method corresponding to the measurement of the resistance coefficient in the X direction,
acquiring the additional mass in the Z direction comprises the following steps:
a fixed transmission speed is set for the stepping motor, so that the vertical screw rod can make a speed V in the vertical direction 2 Obtaining the acceleration a of the manifold model in the Z direction by carrying out first-order derivation on the movement speed 2 A ω cos ω t, where a is the maximum movement speed of the manifold model and ω is the oscillation frequency;
the manifold at different moments t is measured in real time by strain gauges on a vertical screw rodTotal resistance F to the model zt According to Newton's second law F 2t ＝m 2t *a 2t And the manifold model acceleration a 2t The additional mass m of the manifold model at the respective time t can be determined as a ω cos ω t 2t Calculating the additional quality value of the manifold model at the time t, and counting m corresponding to the time step delta t of a plurality of periods 2t And calculating an average value to obtain an additional mass value M of the manifold model in the Z direction 2t 。
2. Measuring method according to claim 1, characterized in that the average additional mass value M is added 2t By dimensionless
After processing, obtaining an additional mass coefficient of the manifold model in the Z direction, wherein rho is the fluid density, and V is the volume of the manifold model;
the additional quality coefficient lambda of the manifold model in the X and Y directions can be measured by adopting a method corresponding to the Z direction 0 And λ 1 。
3. The measuring method according to claim 1 or 2, wherein the transverse screw and the vertical screw are ball screws, and two ends of the transverse screw are connected with the longitudinal beam of the main body of the supporting frame through bearings.
4. The measurement method according to claim 3, characterized by comprising: and the vertical screw rod is provided with a thrust ball bearing to bear the weight of the manifold model and prevent the manifold model from overturning.
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| CN115042935B (en) * | 2022-06-23 | 2023-08-18 | 华南理工大学 | Water-entering slamming test device for six-degree-of-freedom movement of structure |
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| CN202886085U (en) * | 2012-11-19 | 2013-04-17 | 交通运输部天津水运工程科学研究所 | Seaworthy water depth ship model resistance test measurement system |
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