Equivalent hydrodynamic load lateral loading test device and test process thereof

Abstract

The equivalent hydrodynamic load lateral loading test device comprises a triangular reaction frame fixed on a foundation, a model connecting plate is mounted on the triangular reaction frame through a fastener, a test element is fixedly mounted on the triangular reaction frame through a constraint transition section, a loading transition section is mounted at the head of the test element and is hinged to a loading cross beam through a loading shaft, and the loading cross beam is hinged to the model connecting plate. The loading cross beam penetrates through a cavity in the upper part of the supporting vertical beam, and a loading concave spherical surface is fixed at the head part of the loading cross beam; the device further comprises a transverse reaction frame, a hydraulic actuator is installed on the end face of the transverse reaction frame through an oil cylinder connecting plate, a loading convex spherical surface matched with the loading concave spherical surface is fixed to the output end of the hydraulic actuator, and the hydraulic actuator is connected with an electro-hydraulic servo loading control system to achieve equivalent loading of the hydrodynamic load. The strain and deformation response of the stern structure of the underwater vehicle under the equivalent load is obtained, and the reliability of a numerical simulation result and the feasibility of a load equivalent method can be verified by comparing the strain and deformation response with a simulation result.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrodynamic tests and testing devices, in particular to an equivalent hydrodynamic load lateral loading test device and a test process thereof. Background Art

[0002] The mechanical properties of the stern structure of underwater vehicles using rim thrusters differ significantly from those using traditional shaftline propulsion. In the former, the entire stern duct structure is located outside the main pressure hull and connected to it via a limited number of connections. The hydrodynamic loads generated during unconventional and extreme maneuvers pose significant challenges to the safety of the multi-connector structure at the transition point, severely threatening the overall safety of the structure. Due to the unique propulsion method of rim thrusters, the longitudinal connection structure becomes the primary load-bearing module, making the safety of the connection structure paramount.

[0003] To assess and verify the structural safety of the stern structure under extreme operating conditions, corresponding numerical verification and experimental testing are required. The numerical simulation part can use conventional CFD software to predict responses under multiple operating conditions, obtaining the variation patterns of structural stress, deformation, bearing capacity, instability modes, and other results with load input. Experimental testing can be designed for specific operating conditions to verify the validity of the numerical simulation results. At this time, the similarity relationship, boundary constraints, and loading method in the model design become the key factors determining the success or failure of the test. Considering the operability of the test, the hydrodynamic load in CFD is usually equivalent to a concentrated load that can be statically loaded based on the same structural response, and used as the load input for the model test. Summary of the Invention

[0004] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides an equivalent hydrodynamic load lateral loading test device and a test process thereof, which can conveniently realize the equivalent loading of hydrodynamic loads and obtain the strain and deformation response of the stern structure of the underwater vehicle under the equivalent load. By comparing with the simulation results, the reliability of the numerical simulation results and the feasibility of the load equivalence method can be verified.

[0005] The technical solutions adopted in the present invention are as follows:

[0006] A lateral loading test device for an equivalent hydrodynamic load comprises a triangular reaction frame fixed on a foundation, wherein a model connecting plate is mounted on the end face of the triangular reaction frame via fasteners, a test element is fixedly mounted on the model connecting plate via a constraint transition section, a loading transition section is mounted on the head of the test element, the loading transition section is hinged to a loading beam via a loading shaft, and further comprises a supporting vertical beam fixed on the foundation, the loading beam passes through an upper cavity of the supporting vertical beam, and a loading concave spherical surface is fixed to the head of the loading beam; and further comprises a lateral reaction frame fixed on the foundation, a hydraulic actuator is mounted on the end face of the lateral reaction frame via an oil cylinder connecting plate, a loading convex spherical surface matching the loading concave spherical surface is fixed to the output end of the hydraulic actuator, and the hydraulic actuator is connected to an electro-hydraulic servo loading control system.

[0007] Its further technical solution is:

[0008] The test element adopts a stern model, and the stern model is a truncated cone structure.

[0009] The stern model is equipped with a displacement sensor and a strain sensor, which are connected to a strain-displacement testing system.

[0010] The stern model is also equipped with a recording system.

[0011] The transverse reaction frame and the triangular reaction frame are installed vertically in space.

[0012] The curvature of the loaded convex spherical surface is the same as that of the loaded concave spherical surface.

[0013] The loading convex spherical surface is in complete contact with the loading concave spherical surface.

[0014] The supporting vertical beam is a frame-type structure, and a limiting top plate is installed on the top surface of the supporting vertical beam.

[0015] The constraint transition section is provided with a plurality of reinforcing brackets evenly distributed in the circumferential direction, and the reinforcing brackets are in a rectangular structure.

[0016] A test process of an equivalent hydrodynamic load lateral loading test device includes the following operation procedures:

[0017] S1: Preparation;

[0018] Prepare all parts;

[0019] S2: Installation of triangular reaction frame and tested component;

[0020] First, the triangular reaction frame is fixed to the foundation with bolts, and then the strain sensor and displacement sensor are installed on the stern model, and the stern model with the strain sensor and displacement sensor is fixed to the triangular reaction frame;

[0021] S3: Installation of supporting vertical beams;

[0022] According to the size of the stern model, fix the supporting vertical beam in a suitable position, then hinge the loading transition section to the loading crossbeam through the loading axis, and at the same time, the loading crossbeam passes through the cavity at the upper end of the supporting vertical beam;

[0023] S4: Installation of lateral reaction frame;

[0024] Fix the lateral reaction frame at a position perpendicular to the triangular reaction frame, and then fix the hydraulic actuator on the lateral reaction frame;

[0025] S5: connection between hydraulic actuator and loading beam;

[0026] A loading concave spherical surface is installed on the head of the loading beam, and a loading convex spherical surface is installed on the output end of the hydraulic actuator, and the loading concave spherical surface is in spherical contact with the loading convex spherical surface;

[0027] S6: Debugging work;

[0028] Connect the strain sensor and displacement sensor on the stern model to the strain-displacement test system and perform initial zero adjustment;

[0029] S7: Setting the loading rate and load-time curve parameters of the hydraulic actuator through the electro-hydraulic servo loading control system;

[0030] S8: Start the hydraulic actuator to apply a lateral equivalent static load to the stern model. Use the strain-displacement test system to collect the structural strain and displacement data of the stern model under the lateral load, and use the recording system to capture the failure evolution law of the stern model.

[0031] The beneficial effects of the present invention are as follows:

[0032] The present invention has a compact and reasonable structure and is easy to operate. Through the mutual cooperation between components such as the loading transition section, the constraint transition section, the loading shaft, the loading crossbeam, the supporting vertical beam, the hydraulic actuator, the triangular reaction frame, the lateral reaction frame, the recording system, the electro-hydraulic servo loading control system and the strain-displacement testing system, equivalent loading of the hydrodynamic load can be achieved, and the strain and deformation response of the stern structure of the underwater vehicle under the equivalent load can be obtained. By comparing with the simulation results, the reliability of the numerical simulation results and the feasibility of the load equivalence method can be verified.

[0033] The present invention can be used to simulate the stress state of the stern duct structure of an underwater vehicle using a rim thruster under extreme hydrodynamic loads, collect structural response data such as strain and deformation of the duct and its connecting components under lateral equivalent concentrated loads, and obtain its ultimate bearing capacity failure pressure and failure form. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention.

[0035] Figure 2 This is a structural diagram of the present invention from another perspective.

[0036] Among them: 1. Stern model; 2. Loading transition section; 3. Constraint transition section; 4. Loading axis; 5. Loading crossbeam; 6. Supporting vertical beam; 7. Loading convex spherical surface; 8. Limiting top plate; 9. Hydraulic actuator; 10. Cylinder connecting plate; 11. Reinforced elbow plate; 12. Model connecting plate; 13. Triangular reaction frame; 14. Lateral reaction frame; 15. Loading concave spherical surface; 16. Recording system; 17. Electro-hydraulic servo loading control system; 18. Strain displacement test system. DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0038] like Figure 1 and Figure 2 As shown, the equivalent hydrodynamic load lateral loading test device of this embodiment includes a triangular reaction frame 13 fixed on the foundation, and the end surface of the triangular reaction frame 13 is installed with a model connecting plate 12 through fasteners. A test element is fixedly installed on the model connecting plate 12 through a constraint transition section 3, and a loading transition section 2 is installed at the head of the test element. The loading transition section 2 is hinged to the loading beam 5 through a loading shaft 4. It also includes a supporting vertical beam 6 fixed on the foundation, the loading beam 5 passes through the upper cavity of the supporting vertical beam 6, and a loading concave spherical surface 15 is fixed to the head of the loading beam 5; it also includes a lateral reaction frame 14 fixed on the foundation, and the end surface of the lateral reaction frame 14 is installed with a hydraulic actuator 9 through an oil cylinder connecting plate 10. A loading convex spherical surface 7 matching the loading concave spherical surface 15 is fixed to the output end of the hydraulic actuator 9, and the hydraulic actuator 9 is connected to an electro-hydraulic servo loading control system 17.

[0039] The test element adopts the stern model 1, which has a truncated cone structure.

[0040] A displacement sensor and a strain sensor are installed on the stern model 1 , and the displacement sensor and the strain sensor are connected to the strain-displacement testing system 18 .

[0041] A recording system 16 is also installed on the stern model 1.

[0042] The transverse reaction frame 14 and the triangular reaction frame 13 are installed vertically in space.

[0043] The curvature of the loading convex spherical surface 7 and the loading concave spherical surface 15 are the same.

[0044] The loading convex spherical surface 7 is in complete contact with the loading concave spherical surface 15 .

[0045] The supporting vertical beam 6 is a frame-type structure, and a limiting top plate 8 is installed on the top surface of the supporting vertical beam 6.

[0046] The constraint transition section 3 has a plurality of reinforcement brackets 11 evenly distributed in the circumferential direction. The reinforcement brackets 11 are rectangular in structure.

[0047] The test process of the equivalent hydrodynamic load lateral loading test device of this embodiment includes the following operation flow:

[0048] S1: Preparation;

[0049] Prepare all parts;

[0050] S2: Installation of the triangular reaction frame 13 and the tested component;

[0051] First, the triangular reaction frame 13 is fixed to the foundation using bolts, and then the strain sensor and displacement sensor are installed on the stern model 1, and the stern model 1 with the strain sensor and displacement sensor is fixed to the triangular reaction frame 13;

[0052] S3: Installation of supporting vertical beam 6;

[0053] According to the size of the stern model 1, fix the supporting vertical beam 6 in a suitable position, then hinge the loading transition section 2 to the loading crossbeam 5 through the loading shaft 4, and at the same time, the loading crossbeam 5 passes through the upper end cavity of the supporting vertical beam 6;

[0054] S4: Installation of the lateral reaction frame 14;

[0055] Fix the lateral reaction frame 14 at a position perpendicular to the triangular reaction frame 13, and then fix the hydraulic actuator 9 on the lateral reaction frame 14;

[0056] S5: connection between the hydraulic actuator 9 and the loading beam 5;

[0057] A loading concave spherical surface 15 is installed at the head of the loading beam 5, and a loading convex spherical surface 7 is installed at the output end of the hydraulic actuator 9. The loading concave spherical surface 15 is in spherical contact with the loading convex spherical surface 7.

[0058] S6: Debugging work;

[0059] Connect the strain sensor and displacement sensor on the stern model 1 to the strain-displacement testing system 18 and perform initial zeroing;

[0060] S7: Setting the loading rate and load-time curve parameters of the hydraulic actuator 9 through the electro-hydraulic servo loading control system 17;

[0061] S8: Start the hydraulic actuator 9 to apply a lateral equivalent static load to the stern model 1. The structural strain and displacement data of the stern model 1 under the lateral load are collected through the strain and displacement testing system 18, and the failure evolution law of the stern model 1 is captured through the recording system 16.

[0062] The specific structure and function of the equivalent hydrodynamic load lateral loading test device described in the present invention are as follows:

[0063] Its basic components include: stern model 1, loading transition section 2, constraint transition section 3, loading shaft 4, loading crossbeam 5, supporting vertical beam 6, loading convex spherical surface 7, limiting top plate 8, hydraulic actuator 9, cylinder connecting plate 10, reinforcing bracket 11, model connecting plate 12, triangular reaction frame 13, lateral reaction frame 14, loading concave spherical surface 15, recording system 16, electro-hydraulic servo loading control system 17 and strain displacement testing system 18.

[0064] The stern model 1 is the experimental research object, and its two ends are fixedly connected to the loading transition section 2 and the constraint transition section 3 respectively. Displacement, strain and other sensors are arranged on the stern model 1 and connected to the strain-displacement test system 18 to collect structural response data during the test.

[0065] The loading transition section 2 and the constraint transition section 3 provide load input and boundary constraints for the stern model 1, respectively. The loading transition section 2 is hinged to the loading beam 5 through the loading shaft 4. The constraint transition section 3 is evenly provided with reinforcing brackets 11 around the circumference to increase the constraint stiffness. The constraint transition section 3 is fixed to the triangular reaction frame 13 through the model connecting plate 12.

[0066] The transverse reaction frame 14 is installed vertically to the triangular reaction frame 13 and is fixed to the foundation with bolts. The transverse reaction frame 14 fixes the hydraulic actuator 9 through the cylinder connecting plate 10.

[0067] The loading convex spherical surface 7 is the output component of the load of the hydraulic actuator 9, and has the same curvature as the loading concave spherical surface 15. The two are in complete spherical contact, ensuring that the input load of the loading concave spherical surface 15 always remains along the direction of the loading beam 5.

[0068] The loading concave spherical surface 15 is connected to the loading beam 5, and both are located inside the upper end cavity of the supporting vertical beam 6; the supporting vertical beam 6 provides lateral support for the loading beam 5; the loading beam 5 can be laterally translated along the upper end cavity of the supporting vertical beam 6; a limiting top plate 8 is set on the top of the supporting vertical beam 6 to prevent the loading beam 5 from moving vertically.

[0069] The hydraulic actuator 9 is connected to the electro-hydraulic servo loading control system 17 to set parameters such as loading rate and load-time curve to control its loading program.

[0070] The working principle of this embodiment is as follows:

[0071] Fix the triangular reaction frame 13 to the foundation with bolts, and fix the stern model 1 with the strain sensor, displacement sensor and other test components arranged on it to the triangular reaction frame 13;

[0072] According to the size of the stern model 1, fix the supporting vertical beam 6 in a suitable position, and hinge the loading transition section 2 to the loading crossbeam 5 through the loading shaft 4;

[0073] Fix the lateral reaction frame 14 at a position perpendicular to the triangular reaction frame 13, and fix the hydraulic actuator 9 on the lateral reaction frame 14;

[0074] Connect the strain sensor, displacement sensor and other test elements on the stern model 1 to the strain and displacement test system 18 and perform initial zero adjustment;

[0075] Setting parameters such as the loading rate and load-time curve of the hydraulic actuator 9 through the electro-hydraulic servo loading control system 17;

[0076] The hydraulic actuator 9 is started to apply a lateral equivalent static load to the stern model 1. The structural strain, displacement and other data of the stern model 1 under the lateral load are collected through the strain-displacement testing system 18, and the failure evolution law of the stern model 1 is captured through the recording system 16.

[0077] Through the above process, the equivalent loading of hydrodynamic loads can be easily achieved, and the strain and deformation response of the stern structure of the underwater vehicle under the equivalent load can be obtained. By comparing with the simulation results, the reliability of the numerical simulation results and the feasibility of the load equivalence method can be verified.

[0078] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. An equivalent hydrodynamic load lateral loading test device, characterized by: The invention comprises a triangular reaction frame (13) fixed on the foundation, wherein the end surface of the triangular reaction frame (13) is mounted with a model connecting plate (12) via a fastener, a test element is fixedly mounted on the model connecting plate (12) via a constraint transition section (3), a loading transition section (2) is mounted on the head of the test element, and the loading transition section (2) is hinged to a loading crossbeam (5) via a loading shaft (4), a supporting vertical beam (6) fixed on the foundation, the loading crossbeam (5) passes through the upper cavity of the supporting vertical beam (6), and a loading concave spherical surface (15) is fixed on the head of the loading crossbeam (5); and a transverse reaction frame (14) fixed on the foundation, wherein the end surface of the transverse reaction frame (14) is mounted with a hydraulic actuator (9) via an oil cylinder connecting plate (10), a loading convex spherical surface (7) matching the loading concave spherical surface (15) is fixed to the output end of the hydraulic actuator (9), and the hydraulic actuator (9) is connected to an electro-hydraulic servo loading control system (17).

2. The equivalent hydrodynamic load lateral loading test device according to claim 1, characterized in that: The test element adopts a stern model (1), and the stern model (1) is a truncated cone structure.

3. The equivalent hydrodynamic load lateral loading test device according to claim 2, characterized in that: A displacement sensor and a strain sensor are installed on the stern model (1), and the displacement sensor and the strain sensor are connected to a strain-displacement testing system (18).

4. The equivalent hydrodynamic load lateral loading test device according to claim 3, characterized in that: The stern model (1) is also equipped with a recording system (16).

5. The equivalent hydrodynamic load lateral loading test device according to claim 4, characterized in that: The transverse reaction frame (14) and the triangular reaction frame (13) are installed vertically in space.

6. The equivalent hydrodynamic load lateral loading test device according to claim 5, characterized in that: The curvature of the loading convex spherical surface (7) and the loading concave spherical surface (15) are the same.

7. The equivalent hydrodynamic load lateral loading test device according to claim 6, characterized in that: The loading convex spherical surface (7) is in complete contact with the loading concave spherical surface (15).

8. The equivalent hydrodynamic load lateral loading test device according to claim 1, characterized in that: The supporting vertical beam (6) is a frame-type structure, and a limiting top plate (8) is installed on the top surface of the supporting vertical beam (6).

9. The equivalent hydrodynamic load lateral loading test device according to claim 1, characterized in that: The constrained transition section (3) has a plurality of reinforcing brackets (11) evenly distributed in the circumferential direction, and the reinforcing brackets (11) are rectangular in structure.

10. A test process for the equivalent hydrodynamic load lateral loading test device according to claim 1, characterized in that: The following operating procedures are included: S1: Preparation; Prepare all parts; S2: Installation of the triangular reaction frame (13) and the tested component; First, the triangular reaction frame (13) is fixed on the foundation by bolts, and then the strain sensor and the displacement sensor are installed on the stern model (1), and the stern model (1) with the strain sensor and the displacement sensor is fixed on the triangular reaction frame (13); S3: Installation of supporting vertical beam (6); According to the size of the stern model (1), the supporting vertical beam (6) is fixed at a suitable position, and then the loading transition section (2) is hinged to the loading cross beam (5) through the loading shaft (4), and the loading cross beam (5) passes through the upper end cavity of the supporting vertical beam (6); S4: Installation of the lateral reaction frame (14); Fix the lateral reaction frame (14) at a position perpendicular to the triangular reaction frame (13), and then fix the hydraulic actuator (9) on the lateral reaction frame (14); S5: connection between the hydraulic actuator (9) and the loading beam (5); A loading concave spherical surface (15) is installed on the head of the loading crossbeam (5), and a loading convex spherical surface (7) is installed on the output end of the hydraulic actuator (9), and the loading concave spherical surface (15) is in spherical contact with the loading convex spherical surface (7); S6: Debugging work; Connecting the strain sensor and displacement sensor on the stern model (1) to the strain-displacement testing system (18), and performing initial zeroing; S7: Setting the loading rate and load-time curve parameters of the hydraulic actuator (9) through the electro-hydraulic servo loading control system (17); S8: Start the hydraulic actuator (9) to apply a lateral equivalent static load to the stern model (1), collect the structural strain and displacement data of the stern model (1) under the lateral load through the strain displacement test system (18), and capture the failure evolution law of the stern model (1) through the recording system (16).

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