CN201464154U - An environmental load measuring device for an ocean engineering model - Google Patents

Abstract

The utility model relates to an environmental load measuring device for a marine engineering model, which is characterized in that its measuring system is composed of a sextant, a spring, a tension sensor, a non-contact optical measuring instrument, a computer and an automatic data acquisition card; a base Placed in the pool, set telescopic fixed brackets on both sides of the base, the lower end of the fixed brackets is fixed on the base; the model of the ocean platform floats on the water surface between the fixed brackets; the model of the ocean platform is equipped with light-emitting elements; the guide rail is fixedly connected to the The top of the two fixed brackets; the upper end of the square rod is connected to the guide rail, and the lower end is connected to the stepping motor; the output shaft of the stepping motor is connected to one end of the sextant force meter, and the other end of the sextant force meter is connected to the model of the offshore platform; the two tension sensors are respectively symmetrical The ground is fixed at both ends of the guide rail, one end of the two springs is respectively connected to both sides of the square bar, and the other end is respectively connected to two tension sensors; the computer is respectively connected to the stepping motor and the automatic data acquisition card.

Description

An environmental load measuring device for an ocean engineering model

technical field

The utility model relates to a measuring device, in particular to an environmental load measuring device for a marine engineering model.

Background technique

The deep-sea platform system is complex in technology, large in investment, and high in risk. Its stress situation is an important basis for designing the offshore platform structure and its moorings, risers and other related systems. Therefore, it is very important to correctly obtain its stress situation in harsh ocean environments. important. When designing the load of the deep-sea platform system, the most reliable method at present is to simulate the actual working conditions of the deep-sea platform system through physical model tests, obtain the load measurement results, and use this as the ultimate basis for designing and building offshore platforms . In the prior art, physical model tests of offshore platforms are carried out in marine engineering pools capable of simulating the marine environment. Wind force, current force, and first-order wave loads are usually measured with a single component force meter, while second-order wave loads The drift force is measured by the additional spring of the single component force meter. When performing load measurement, first mark the bottom of the pool, arrange models and brackets and other related equipment to the corresponding positions, and then measure. After the working conditions of the measurement are changed, it is necessary to rearrange the related equipment such as the model and the bracket to the corresponding position and then carry out the measurement.

After searching the literature of the prior art, it was found that Yang Jianmin et al. published "A New Type of Deep-sea Ocean Platform--Experimental Research on Geometric Spar and Integrated Buoyancy Cylinder" on page 23 of the fourth issue of "Ocean Engineering" in 2003. In this paper, the force of the Spar platform model in the simulated marine environment is measured. The specific method is that when the test model is correctly arranged in the specified position in the pool, all measuring instruments are installed in the correct position and all the data that need to be measured are zeroed. , and then wave machines and other equipment to create the required marine environment, and use tension sensors and pressure sensors to measure the various data required. In addition, Wang Lei et al. published "Model Experimental Research on Second-Order Low-Frequency Slow Drift Force of Dynamically Positioned Ships" on page 1 of the third issue of "Ocean Engineering" in 2006. In this paper, a passive restraint system using linear springs was proposed to measure the The second-order wave force on the semi-submersible platform model can be obtained by using the first-order linear motion of the spring to release the model and restricting its second-order slow drifting motion. However, the problems with the above method are:

1. The test model must be correctly arranged in the specified position in the pool in advance before the measurement can be carried out. When measuring the force of the platform model under other working conditions, it needs to be re-arranged and calibrated.

2. When measuring the second-order wave force in the case of oblique waves, the spring and the semi-submersible platform model cannot be kept in a straight line due to the effect of the wave force, which makes the error of the measured results of the sensor very large and cannot be applied to the analysis and calculation.

3. Every time the measurement angle is changed, the bracket and the spring connected with the sensor need to be moved and disassembled. Since the operation is carried out in the pool by boat, the accuracy cannot usually be achieved, and the workload is heavy.

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a marine engineering model that can complete the measurement of wind force, current force, first-order wave load and second-order wave drift force in any direction of the circumference at one time without the need to rearrange the device Environmental load measuring device.

In order to achieve the above object, the utility model adopts the following technical solutions: an environmental load measuring device for an ocean engineering model, characterized in that it includes an ocean platform model, a support frame and a measurement system; wherein, the support frame is fixed by a base, It consists of bracket, guide rail, square rod and stepping motor; the measurement system is composed of sextant force meter, spring, tension sensor, non-contact optical measuring instrument, computer and automatic data acquisition card; the base is placed in the pool, Retractable fixed brackets are arranged on both sides of the base, and the lower end of the fixed bracket is fixed on the base; the model of the ocean platform floats on the water surface between the fixed brackets; the model of the ocean platform is provided with light-emitting elements; the guide rail is fixedly connected At the top of the two fixed brackets; the upper end of the square bar is connected to the guide rail, and the lower end is connected to the stepper motor; the output shaft of the stepper motor is connected to one end of the sextant, and the sextant The other end of the other end is connected to the offshore platform model; two tension sensors are respectively fixed at the two ends of the guide rail; one end of the two springs is respectively connected to both sides of the square bar, and the other end is connected to two tension sensors; the sextant, The tension sensor and the non-contact optical measuring instrument are respectively connected to the automatic data acquisition card; the computer is respectively connected to the stepper motor and the automatic data acquisition card.

The upper end of the square bar can slide on the guide rail, and can also be fixed with the guide rail.

The non-contact optical measuring instrument, computer and automatic data acquisition card are arranged on a trailer.

The position of the non-contact optical measuring instrument corresponds to the light emitting element.

Because the utility model adopts the above technical scheme, it has the following advantages: 1. The utility model adopts an elastic structure of a sextant force meter plus a spring, an adjustable fixed bracket, and a square rod whose fixing method can be changed according to the measurement target and the angle can be adjusted according to the measurement target. The offshore platform model needs to be adjusted, so the wind force, current force, first-order wave load and second-order wave drift force measurement in any direction of the circumference can be completed at one time without re-arranging the device, and it is not necessary to measure different environmental loads The measuring device can be disassembled and assembled at any time, thus greatly improving the work efficiency, flexible and convenient operation, and saving test consumption. 2. The sextant force meter of the utility model can integrate the measurement functions of several items such as wind force, flow force, first-order wave load and second-order wave drift force at one time through an additional spring structure, and measure the model without moving the device load in either direction. 3. The utility model adopts the method of connecting the platform model with a stepping motor controlled by a computer, so that the angle of the offshore platform model can be adjusted, so that the measuring device can measure the load of the platform model in any direction in the circumferential direction. The utility model can be widely used in model tests of ocean engineering model test platforms to measure different environmental loads such as wind, waves and currents.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the device of the present utility model

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

As shown in Figure 1, the environmental load measuring device of the present utility model includes an ocean platform model 1, a support frame and a measurement system, and a pool is used to simulate the marine environment. Wherein, the support frame consists of a base 2, a fixed support 3, a guide rail 4, Composed of a square rod 5 and a stepping motor 6. The measuring system consists of a sextant 7, a spring 8, a tension sensor 9, a non-contact optical measuring instrument 10, a computer 11 and an automatic data acquisition card 12. The base 2 is placed in a pool , on both sides of the base 2, telescopic fixed brackets 3 are arranged, the lower end of the fixed bracket 3 is fixed on the base 2, and the upper end protrudes from the water surface 13. The ocean platform model 1 is located between the fixed brackets 3 on both sides of the base 2 and floats on the base 2 above the water surface 13. The ocean platform model 1 is provided with three light-emitting elements, corresponding to the non-contact optical measuring instrument 10, to measure the angle and motion state of the ocean platform model 1. The guide rail 4 is fixedly connected to the top of the two fixed brackets 3, The upper end of the square rod 5 can slide on the guide rail 4, and can also be fixed with the guide rail 4 by a fixing device. The lower end of the square rod 5 is connected to the stepping motor 6, and the output shaft of the stepping motor 6 is connected to one end of the sextant 7. The other end of the force component 7 is connected to the offshore platform model 1. Two tension sensors 9 are symmetrically fixed at both ends of the guide rail 4, and one end of the two springs 8 is respectively connected to both sides of the square bar 5, and the other end is respectively connected to two tension sensors 9. Trailer 14 can be placed outside the pool where the utility model device is located, and can also float on the water surface 13. The trailer 14 is provided with a non-contact optical measuring instrument 10, a computer 11 and an automatic data acquisition card 12. sextant force meter 7, The tension sensor 9 and the non-contact optical measuring instrument 10 are respectively connected to the automatic data acquisition card 12 through the data signal line. The computer 11 is respectively connected to the stepper motor 6 and the automatic data acquisition card 12 through the signal line.

The sextant 7 of the utility model measures the loads of six degrees of freedom received by the ocean platform model 1 in the ocean environment, namely surge, sway, heave, roll, pitch and yaw. The spring 8 releases the first-order wave motion of the ocean platform model 1 when measuring the second-order wave drift force. The tension sensor 9 measures the second-order wave drift force suffered by the ocean platform model 1 . The non-contact optical measuring instrument 10 measures the movement of the three light-emitting elements fixed on the ocean platform model 1, sends the obtained movement information to the automatic data acquisition card 12, and uses the computer 11 program to analyze the movement of the ocean platform model 1 in waves. The six degrees of freedom motion states of surge, sway, heave, roll, pitch and yaw. The computer 11 analyzes and processes the movement information of the ocean platform model 1 collected by the automatic data acquisition card 12, and controls the running state of the stepping motor 6 according to the position information obtained on the automatic data acquisition card 12, and corrects the angle of the ocean platform model 1 .

The using method of the environmental load measuring device of the present utility model comprises the following steps:

1) According to the marine environmental conditions that the actual offshore platform system is subjected to during work, the scale of the real offshore platform and the scale of the pool in the test are scaled to make the required offshore platform model 1. After that, the relevant numerical calculation software is used to simulate and calculate the wind, current and first-order wave loads on the offshore platform system, and determine the simulated marine environmental conditions in the environmental load measurement test.

2) When it is necessary to measure wind, current, and first-order wave loads, after adjusting the height of the fixed bracket 3, move the offshore platform model 1 to the corresponding position, fix the upper end of the square rod 5 with the guide rail 4 through the fixing device, and measure The system's instruments are debugged.

When it is necessary to measure the second-order wave drift force, after adjusting the height of the fixed bracket 3, move the offshore platform model 1 to the corresponding position, open the fixing device between the upper end of the square rod 5 and the guide rail 4, and make the upper end of the square rod 5 along the The guide rail 4 slides to debug the instruments of the measuring system.

3) According to the simulation calculation results of the numerical calculation software, various marine environmental conditions required for the environmental load measurement test of the offshore platform are manufactured in the pool, and after the system is stabilized, the automatic data acquisition card 12 and the computer 11 are turned on to carry out the movement of the offshore platform model 1 Information collection and analysis, and active offshore platform hybrid model test.

4) When the measurement angle needs to be changed, the stepper motor 6 is controlled by the computer 11 to rotate the ocean platform model 1 to a suitable position, and then repeat steps 2) and 3).

The utility model can be widely used in the model test of the ocean engineering model test platform to measure different environmental loads such as wind, waves and currents, without disassembling and assembling the measuring device when measuring different environmental loads, thereby greatly improving the High work efficiency, flexible and convenient operation, saving test consumption.

The utility model is only illustrated by implementation, and any equivalent transformation performed on the utility model is not excluded from the protection scope of the utility model.

Claims (5)

1. A kind of environmental load measurement device of ocean engineering model, it is characterized in that: it comprises ocean platform model, support frame and measuring system; Wherein, described support frame is made up of base, fixed support, guide rail, square rod and stepper motor The measurement system is composed of a sextant, a spring, a tension sensor, a non-contact optical measuring instrument, a computer and an automatic data acquisition card; the base is placed in a pool, and telescopic fixed brackets are arranged on both sides of the base, The lower end of the fixed bracket is fixed on the base; the model of the ocean platform floats on the water surface between the fixed brackets; the model of the ocean platform is provided with light-emitting elements; the guide rail is fixedly connected to the top of the two fixed brackets; the square bar The upper end is connected to the guide rail, and the lower end is connected to the stepping motor; the output shaft of the stepping motor is connected to one end of the sextant, and the other end of the sextant is connected to the offshore platform model; The tension sensors are respectively fixed at both ends of the guide rail; one end of the two springs is respectively connected to both sides of the square bar, and the other end is respectively connected to two tension sensors; the sextant, the tension sensor and the non-contact optical measuring instrument are respectively passed It is connected with the automatic data acquisition card; the computer is respectively connected with the stepper motor and the automatic data acquisition card. 2. The environmental load measuring device of a marine engineering model according to claim 1, wherein the upper end of the square rod can slide on the guide rail, or can be fixed with the guide rail. 3. The environmental load measuring device of a marine engineering model as claimed in claim 1, characterized in that: said non-contact optical measuring instrument, computer and automatic data acquisition card are arranged on a trailer. 4. The environmental load measuring device of a marine engineering model as claimed in claim 2, characterized in that: said non-contact optical measuring instrument, computer and automatic data acquisition card are arranged on a trailer. 5 . The environmental load measuring device of an ocean engineering model according to claim 1 , 2 , 3 or 4 , wherein the position of the non-contact optical measuring instrument corresponds to the light emitting element. 6 .

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