Anti-torsion force measuring device for large-scale vortex-induced vibration model test

Abstract

The utility model discloses an anti-torsion force measuring device for a large-scale vortex-induced vibration model test, which belongs to the technical field of experimental mechanics and ocean engineering test equipment and comprises an upper connecting plate and a lower connecting plate which are connected through an array sensor module. The bottom of the lower connecting plate is connected with a stress model assembly through a lower end connecting rod. According to the torsion-resistant force measuring device for the large-scale vortex-induced vibration model test, through arrangement optimization, a torsion-resistant structure is realized, the influence of bending moment generated by a cantilever structure on the measurement precision of a sensor is eliminated, the accuracy of force measurement and the stability of a system are improved, and the reliability of the system is improved. The method is suitable for research scenes related to large-scale model experiments such as vortex-induced vibration.

Description

Technical Field

[0001] This utility model relates to the field of experimental mechanics and marine engineering test equipment technology, and in particular to a torsional force measuring device for large-scale vortex-induced vibration model testing. Background Technology

[0002] In existing technologies, vortex-induced vibration is a common flow-induced vibration phenomenon, widely found in marine engineering structures, bridge cables, oil pipelines, and other engineering structures. To deeply study the characteristics of vortex-induced vibration, experimental methods have become an important technical means. In vortex-induced vibration experiments, it is usually necessary to measure the excitation force information of a cylindrical model under fluid action using a three-dimensional force sensor to study its dynamic response. Especially in strongly coupled physical simulation experiments based on a virtual mass spring-damped system, accurate force signals are crucial for system control and data analysis.

[0003] For cylindrical models in vortex-induced vibration experiments, a cantilever mounting structure is often required, in which sensors are installed at the top of the model to collect force signals. When the model is subjected to lateral hydrodynamic forces from the fluid, not only are horizontal force components generated, but also bending moment effects are introduced due to the distance between the point of application and the sensor position. Traditional sensor mounting structures fail to effectively eliminate the additional force on the sensor caused by bending moment, resulting in problems such as large measurement errors and poor stability, which are particularly significant in large-scale model experiments. Summary of the Invention

[0004] The purpose of this invention is to provide a torsional force measuring device for large-scale vortex-induced vibration model experiments. Through optimized layout, a torsional structure is achieved, eliminating the influence of bending moment generated by the cantilever structure on the sensor measurement accuracy, improving the accuracy of force measurement and system stability. It is suitable for research scenarios involving large-scale model experiments such as vortex-induced vibration.

[0005] To achieve the above objectives, this utility model provides a torsional force measuring device for large-scale vortex-induced vibration model testing, comprising an upper connecting plate and a lower connecting plate, which are connected by an array sensor module; the bottom of the lower connecting plate is connected to a force-bearing model assembly via a lower connecting rod.

[0006] Preferably, the array sensor module includes several three-dimensional force sensors symmetrically distributed between the upper connecting plate and the lower connecting plate.

[0007] Preferably, the array sensor module consists of a first force sensor, a second force sensor, a third force sensor, and a fourth force sensor distributed at the four corners between the upper connecting plate and the lower connecting plate, forming a 2×2 array structure.

[0008] Preferably, the spacing between the first force sensor, the second force sensor, the third force sensor, and the fourth force sensor satisfies the moment balance relationship with the force model assembly.

[0009] Preferably, a lower connecting rod is provided at each of the four bottom corners of the lower connecting plate.

[0010] Preferably, the force-bearing model assembly includes an upper guide plate connected to the lower connecting rod, a cylindrical model connected to the bottom of the upper guide plate, and a lower guide plate connected to the bottom of the cylindrical model.

[0011] Preferably, both the upper and lower guide vanes of the model are circular.

[0012] Therefore, this utility model adopts the above-mentioned anti-torsion force measuring device for large-scale vortex-induced vibration model test. Through the sensor structure arranged in a symmetrical array, the bending moment caused by the structural length is converted into tensile and compressive torques that cancel each other out, thereby reducing measurement errors, avoiding signal fluctuations caused by bending effects, effectively enhancing data stability and system robustness. It is suitable for vortex-induced vibration experiments of large-scale cylindrical models and has good engineering adaptability.

[0013] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the anti-torsional force measuring device for large-scale vortex-induced vibration model test of this utility model, applied to vortex-induced vibration experiment.

[0015] Figure 2 This is a schematic diagram of the motion actuator used in the experiment;

[0016] Figure 3 This is a schematic diagram of the overall structure of a torsional force measuring device for a large-scale vortex-induced vibration model test according to this utility model.

[0017] Figure 4 This is a schematic diagram of the array sensor module layout;

[0018] Figure 5 This is a diagram showing the forces acting on the object in the horizontal direction.

[0019] Figure Labels

[0020] 1. Trailer; 2. Fixed frame; 3. Water tank; 4. Linear motion module; 5. Guide rail; 6. Upper connector; 7. Upper connecting plate; 8. Lower connecting plate; 9. Lower connecting rod; 10. Upper guide plate of the model; 11. Cylindrical model; 12. Lower guide plate of the model; 13. First force sensor; 14. Second force sensor; 15. Third force sensor; 16. Fourth force sensor. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example 1

[0024] This invention provides a torsional force measuring device for large-scale vortex-induced vibration model testing, mainly used to measure the fluid force on a cylindrical model in a flow field, and overcomes the sensor measurement error problem caused by bending moment in traditional cantilever structures.

[0025] like Figure 1 As shown, the anti-torsion force measuring device in this embodiment is integrated into a vortex-induced vibration experimental device. This vortex-induced vibration experimental device is based on a virtual mass spring damping system and uses the force feedback principle to simulate actual vibration motion. It includes a trailer 1, a water tank 3 mounted on the trailer 1, and a fixed frame 2 positioned above the water tank 3. The bottom of the anti-torsion force measuring device in this embodiment is fixed inside the water tank 3, and the top is fixed to the fixed frame 2. During the experiment, water is injected into the water tank 3, and then the trailer 1 is moved to generate fluid force in the water tank 3. The experimental data is then read through the anti-torsion force measuring device of this embodiment.

[0026] A motion actuator is installed in the fixed frame 2, such as Figure 2As shown, the device includes a linear motion module 4, a guide rail 5, and an upper connector 6. The top of the torsion-resistant force measuring device in this embodiment is connected to the upper connector 6. During the experiment, the linear motion output by the linear module 4 is transmitted to the cylindrical model 11 via the upper connector 6. The guide rail 5 bears the overall load in the vertical direction. The force signal is acquired by the array force sensor module installed on the top of the torsion-resistant force measuring device and transmitted to the control system for feedback and recording. The array force sensor module, as a key component connecting the cylindrical model 11 and the experimental device, has a significant impact on the experimental accuracy due to its force transmission path and anti-interference capability.

[0027] like Figure 3 As shown, the anti-torsion force measuring device in this embodiment includes an upper connecting plate 7 and a lower connecting plate 8. The upper connecting plate 7 and the lower connecting plate 8 are connected by an array sensor module. The bottom of the lower connecting plate 8 is connected to a force model component through a lower connecting rod 9.

[0028] The array sensor module includes several three-dimensional force sensors symmetrically distributed between the upper connecting plate 7 and the lower connecting plate 8, enabling structural connection and three-dimensional force load measurement. A lower connecting rod 9 is installed at each of the four bottom corners of the lower connecting plate 8 to ensure a stable connection between the array sensor module and the force-bearing model assembly. The force-bearing model assembly includes an upper guide plate 10 connected to the lower connecting rods 9. A cylindrical model 11 is connected to the bottom of the upper guide plate 10, and a lower guide plate 12 is connected to the bottom of the cylindrical model 11. Both the upper guide plate 10 and the lower guide plate 12 are circular, designed to improve the streamline conditions of water entering the model and reduce additional torque caused by water flow interference. The upper guide plate 12 also provides mounting support for the connecting structure above.

[0029] During operation, the horizontal force (which can be decomposed into x and y directions) generated by the water flow on the large-scale cylindrical model causes bending moment at the upper end of the model, affecting measurement accuracy. This is counteracted by equal and opposite tensile and compressive torques generated by symmetrically distributed sensors within the structure. This ensures that the force signal measured by the sensors primarily reflects the actual force rather than the additional force caused by the bending moment, effectively improving measurement accuracy.

[0030] This embodiment uses a partial force situation during the experiment (taking the y-direction as an example) as follows: Figure 5 As shown, it is assumed that the hydrodynamic force on the cylindrical model 11 can be decomposed into two orthogonal components in the horizontal plane, where the horizontal hydrodynamic force F in the y-direction is... y Let's take an example. The hydrodynamic force acts on the lower end of the cylindrical model 11, at a distance D from the sensor mounting plane, creating a bending moment around the axis on the upper end.

[0031] To measure this hydrodynamic force and counteract bending moment interference, this embodiment is designed as follows: Figure 4The 2×2 array-type three-dimensional force sensor structure shown comprises four three-dimensional force sensors arranged at the four corners of the upper connecting plate 7, namely, the first force sensor 13, the second force sensor 14, the third force sensor 15, and the fourth force sensor 16. When subjected to horizontal hydrodynamic forces, the four three-dimensional force sensors, through symmetrical arrangement, form tensile and compressive couples to balance the additional load caused by bending moments, thereby improving measurement accuracy. The spacing between the first force sensor 13, the second force sensor 14, the third force sensor 15, and the fourth force sensor 16 satisfies the bending moment balance relationship with the force model components to eliminate moment interference caused by the cantilever structure and ensure the torsional resistance of the structure.

[0032] Figure 5 As can be seen, the first force sensor 13 and the second force sensor 14 are located in front of the viewpoint, and the third force sensor 15 and the fourth force sensor 16 are also installed symmetrically behind them. Due to the limited angle of the illustration, they are not shown, but their force conditions are completely the same as those of the first force sensor 13 and the second force sensor 14, based on the structural symmetry and loading conditions.

[0033] Under ideal conditions (ignoring assembly errors and other disturbance loads), the hydrodynamic force F y The sensor layer is distributed as follows:

[0034] The average load on the four sensors in the y-direction is such that the force on each sensor in the y-direction is:

[0035]

[0036] At the same time, F y The torque produced by the resultant force of the sensor in the y-direction is:

[0037] M = F y ·D

[0038] The bending moment is balanced by the tension and compression couple between the sensors. Assume the first force sensor 13 and the second force sensor 14 in the diagram are arranged along the y-direction with a distance d between them. To counteract the bending moment, the first force sensor 13 is subjected to a tensile force F. 12 The second force sensor 14 is subjected to pressure F 22 The third force sensor 15 is subjected to a tensile force F. 32 The fourth force sensor 16 is subjected to pressure F 42 Due to structural symmetry, under ideal conditions (ignoring assembly errors and other disturbance loads), the tensile and compressive forces acting on the sensor are equal:

[0039] F i2 =F1(i=1,2,3,4)

[0040] The tensile and compressive torque formed between the sensors is:

[0041] M1 = 2·F1·d

[0042] The equilibrium condition is:

[0043]

[0044] The tensile and compressive forces measured by the upper sensors not only reflect the magnitude of the horizontal hydrodynamic forces acting on the model, but also serve to balance the bending moments of the model. Due to the complete symmetry of the sensor arrangement, there is also the same force and bending moment balance mechanism in the x-direction, so the structure has excellent resistance to bending interference in both horizontal directions.

[0045] Therefore, this utility model adopts the above-mentioned anti-torsion force measuring device for large-scale vortex-induced vibration model test. Through the joint force measurement of multiple sensors arranged in a symmetrical array, the bending moment generated by the model during the experiment is effectively converted into an equivalent tensile and compressive couple between the sensors. This avoids the measurement error caused by the cantilever structure directly transmitting the bending moment to the sensors, improves the accuracy and stability of the force measuring system, and is suitable for high-precision vortex-induced vibration experimental environments.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A torsional force measuring device for large-scale vortex-induced vibration model tests, characterized in that: It includes an upper connecting plate and a lower connecting plate, which are connected by an array sensor module; the bottom of the lower connecting plate is connected to a force-bearing model component via a lower connecting rod.

2. The torsional force measuring device for large-scale vortex-induced vibration model testing according to claim 1, characterized in that: The array sensor module includes several three-dimensional force sensors symmetrically distributed between the upper and lower connecting plates.

3. The torsional force measuring device for large-scale vortex-induced vibration model testing according to claim 2, characterized in that: The array sensor module consists of a first force sensor, a second force sensor, a third force sensor, and a fourth force sensor distributed at the four corners between the upper connecting plate and the lower connecting plate, forming a 2×2 array structure.

4. The torsional force measuring device for large-scale vortex-induced vibration model testing according to claim 3, characterized in that: The spacing between the first force sensor, the second force sensor, the third force sensor, and the fourth force sensor satisfies the moment balance relationship with the force model component.

5. The torsional force measuring device for large-scale vortex-induced vibration model testing according to claim 1, characterized in that: A lower connecting rod is provided at each of the four bottom corners of the lower connecting plate.

6. The torsional force measuring device for large-scale vortex-induced vibration model testing according to claim 1, characterized in that: The force-bearing model assembly includes an upper guide plate connected to the lower connecting rod, a cylindrical model connected to the bottom of the upper guide plate, and a lower guide plate connected to the bottom of the cylindrical model.

7. The torsional force measuring device for large-scale vortex-induced vibration model testing according to claim 6, characterized in that: Both the upper and lower guide vanes of the model are circular.

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