Multi-degree-of-freedom decoupling member for simulation of wind wave flow under high gravity field and method of using same

Abstract

The application discloses a multi-degree-of-freedom decoupling component for wind wave flow simulation under a supergravity field and a use method thereof. The component comprises a decoupling component, a dynamic loading device and a model. The decoupling component has six degrees of freedom. The decoupling component comprises an adapter ball, a transmission rod, a sliding bearing shaft and a fixer. The fixer is fixedly connected with the model. The fixer is installed at both ends of the sliding bearing shaft. One end of the transmission rod is also installed on the sliding bearing shaft. The other end of the transmission rod is sequentially connected with the adapter ball and the dynamic loading device. The decoupling component can decouple the six degrees of freedom and has high sensitivity. The model can freely deform in the soil under the premise that no additional constraint is added in the supergravity field. The decoupling component has simple structure and small space occupation, is more suitable for use in the limited space of the model box and can simulate the simultaneous action of three different types of loads, i.e. sea wind, sea wave and sea current under the supergravity field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-degree-of-freedom decoupling in a supergravity field, and in particular to a multi-degree-of-freedom decoupling component for simulating wind, wave and current loads in a supergravity field and a use method thereof. BACKGROUND

[0002] A supergravity field is also known as a centrifugal field, which is a field that simulates gravity using centrifugal force provided by rotation of a centrifuge. According to the theory of relativity, Newton's gravity and inertial force are equivalent, so the centrifugal force can be increased by accelerating rotation, i.e., the gravity experienced by a model can be increased equivalently, thereby forming a supergravity field environment. A similar scaled-down model is placed in a model box dedicated to the centrifuge to simulate the actual force conditions of the prototype, and the related engineering properties are studied under the premise that the centrifuge does not stop rotating.

[0003] At present, the multi-degree-of-freedom decoupling technology in a supergravity field is not mature, and the main reason is that the sensitivity of load response in a supergravity field is high. When multiple loads act simultaneously and the degrees of freedom for decoupling are insufficient, they will interfere with each other and affect the simulation results. In addition, because the space in the model box dedicated to the centrifuge is limited, it is not suitable for complex and large-size load decoupling components. For example, the Chinese patent document with publication number CN110426224A discloses a five-degree-of-freedom load decoupling component suitable for marine model tests. However, this component has the following defects: the number of degrees of freedom for load decoupling is insufficient, it cannot effectively decouple when sea wind, sea wave and sea current loads act simultaneously in a supergravity field, and because the decoupling component is too complex and occupies a large space, it cannot be placed in the model box dedicated to the centrifuge for simulation and research.

[0004] In summary, to ensure the accuracy of simulation in a supergravity field, it is difficult to complete the simulation of three different types of loads, i.e., sea wind, sea wave and sea current, acting simultaneously under the premise that the centrifuge does not stop rotating. Therefore, it is of great significance to design a multi-degree-of-freedom decoupling component suitable for this situation. SUMMARY

[0005] The present application aims to provide a multi-degree-of-freedom decoupling component for simulating wind, wave and current loads in a supergravity field and a use method thereof, to solve the problems existing in the prior art, to realize the simulation of three different types of loads, i.e., sea wind, sea wave and sea current, acting simultaneously, and to provide a specific simulation method to explore the dynamic response of the model.

[0006] In order to achieve the above object, the application provides the following scheme: the application provides a multi-degree-of-freedom decoupling component for simulating wind, wave and current under a supergravity field, which comprises a decoupling component, a dynamic loading device and a model; the decoupling component has six degrees of freedom; the decoupling component comprises an adapter ball, a transmission rod, a sliding shaft and a fixer; the fixer is fixedly connected with the model; the fixer is installed at both ends of the sliding shaft; one end of the transmission rod is also installed on the sliding shaft; the other end of the transmission rod is sequentially connected with the adapter ball and the dynamic loading device.

[0007] The fixer comprises a guide rail and a clamp; the clamp is provided with two clamps parallel to each other, and the two clamps are clamped on the model; one end of each of the two clamps is also provided with the guide rail; the two guide rails are installed at both ends of the sliding shaft to form a horizontal movement track.

[0008] The dynamic loading device comprises a sea wind dynamic loading device, a sea current dynamic loading device and a sea wave dynamic loading device; the sea wind dynamic loading device, the sea current dynamic loading device and the sea wave dynamic loading device are installed on a transmission rod respectively, and are used to simulate the dynamic response of the model when three different types of loads, i.e., sea wind, sea wave and sea current, act on the model simultaneously under a supergravity field.

[0009] The six degrees of freedom of the decoupling component are respectively a translation δ1 along a load transmission direction, a translation δ2 in a vertical direction, a translation δ3 in a horizontal plane perpendicular to the load transmission direction, a rotation δ12 in a plane formed by the load transmission direction and the vertical direction, a rotation δ23 in a plane perpendicular to the load transmission direction, and a rotation δ13 in the horizontal plane.

[0010] The adapter ball is used to decouple the constraint of rotation in each direction, i.e., to decouple three degrees of freedom δ12, δ23 and δ13.

[0011] The transmission rod is a double-layer rod, which can be stretched along the load transmission direction, i.e., to decouple one degree of freedom δ1.

[0012] The sliding shaft is a vertical rod, a sleeve is arranged on the sliding shaft and connected with the transmission rod, the sleeve drives the transmission rod to move up and down along the sliding shaft, and the guide rails installed at both ends of the sliding shaft move horizontally along a direction perpendicular to the load transmission direction, i.e., to decouple two degrees of freedom δ2 and δ3.

[0013] The method for using the multi-degree-of-freedom decoupling component for simulating wind, wave and current under a supergravity field comprises the following steps:

[0014] S1: assemble the decoupling component, and connect the sea wind dynamic loading device, the sea current dynamic loading device and the sea wave dynamic loading device with the model from top to bottom through the decoupling component according to the simulation requirement, and place them in the model box;

[0015] S2 will be assembled model box and fixed on the centrifuge basket bottom plate, connected to the test system and safety inspection after using remote control system according to the simulation needs to apply the sea current load, simulate the effect of sea current load;

[0016] S3 rotation stability centrifuge does not stop, continue to apply sea wave load through the remote control system, simulate the combined effect of sea current, sea wave load;

[0017] S4 rotation stability centrifuge does not stop, continue to apply sea wind load through the remote control system, simulate the combined effect of sea current, sea wave, sea wind load, stop simulation and disassembly inspection in turn after reaching the expected duration.

[0018] The application discloses the following technical effects: (1) the decoupling component provided by the application can decouple six degrees of freedom, has high sensitivity, and can ensure that the model can deform freely in the soil without additional constraints in the supergravity field.

[0019] (2) the decoupling component provided by the application has simple structure and small space occupation, is more suitable for use in the limited space of the model box, can simulate the simultaneous action of three different types of loads, namely sea wind, sea wave and sea current, in the supergravity field, and can gradually apply the loads under the premise that the centrifuge does not stop and the loads do not interfere with each other.

[0020] (3) the adapter ball in the decoupling component can decouple the rotation constraint first, so that the adapter ball has more degrees of freedom for a short time to meet the effective transmission of the impact load.

[0021] (4) the transmission rod in the decoupling component can decouple the constraint in the load transmission direction, and can meet the effective transmission of the cyclic load under the premise of avoiding disturbing the model.

[0022] (5) the sliding bearing shaft and the guide rail in the decoupling component can further expand the action range of the loading points, and can ensure the effective action of the sustained static load when the model has large inclination, settlement and displacement.

[0023] (6) the clamp in the decoupling component is connected and fixed to the model, and the relative position between the loading points can be kept constant under the condition of large displacement. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a connection schematic diagram of ocean wind wave flow simulation under supergravity field of the application;

[0026] Figure 2 It is a side view of the multi-degree-of-freedom decoupling component of the application;

[0027] Figure 3 It is an additional side view of the multi-degree-of-freedom decoupling component of the application.

[0028] Wherein, 1, decoupling component; 101, adapter ball; 102, conducting rod; 103, sliding shaft; 104, fixer; 104-1, guide rail; 104-2, clamp; 201, sea wind dynamic loading device; 202, sea current dynamic loading device; 203, sea wave dynamic loading device; 3, model. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the application.

[0030] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0031] The application provides a multi-degree-of-freedom decoupling component for wind wave flow simulation under supergravity field, comprising a decoupling component 1, a dynamic loading device and a model 3; the decoupling component 1 has six degrees of freedom, and comprises an adapter ball 101, a conducting rod 102, a sliding shaft 103 and a fixer 104; the fixer 104 is fixedly connected with the model 3; the fixer 104 is installed at both ends of the sliding shaft 103; one end of the conducting rod 102 is also installed on the sliding shaft 103; the other end of the conducting rod 102 is sequentially connected with the adapter ball 101 and the dynamic loading device.

[0032] The fixer 104 comprises a guide rail 104-1 and a clamp 104-2; the clamp 104-2 is provided with two parallel ones, and the two clamps 104-2 are clamped on the model 3; one end of each of the two clamps 104-2 is also provided with the guide rail 104-1; the two guide rails 104-1 are installed at both ends of the sliding shaft 103 respectively, forming a horizontal movement track.

[0033] The dynamic loading device comprises a sea wind dynamic loading device 201, a sea current dynamic loading device 202 and a sea wave dynamic loading device 203; the sea wind dynamic loading device 201, the sea current dynamic loading device 202 and the sea wave dynamic loading device 203 are respectively installed on a transmission rod 102, and are used for simulating the dynamic response of the model when three different types of loads, i.e., sea wind, sea wave and sea wave, act on the model simultaneously under a supergravity field.

[0034] The six degrees of freedom of the decoupling component are respectively a translation δ1 along a load transmission direction, a translation δ2 in a vertical direction, a translation δ3 in a horizontal plane perpendicular to the load transmission direction, a rotation δ12 in a plane of the load transmission direction and the vertical direction, a rotation δ23 in a plane perpendicular to the load transmission direction, and a rotation δ13 in the horizontal plane.

[0035] The adapter ball 101 is used for decoupling the constraint of rotation in each direction, i.e., decoupling three degrees of freedom δ12, δ23 and δ13.

[0036] The transmission rod 102 is a double-layer rod, and can be stretched along the load transmission direction, i.e., decoupling one degree of freedom δ1.

[0037] The sliding shaft 103 is a vertical rod, and a sleeve is arranged on the sliding shaft 103 and connected with the transmission rod 102; the sleeve drives the transmission rod 102 to move up and down along the sliding shaft, and meanwhile, the guide rails 104-1 installed at two ends of the sliding shaft 103 translate in a horizontal plane perpendicular to the load transmission direction, i.e., decoupling two degrees of freedom δ2 and δ3.

[0038] The method for using the multi-degree-of-freedom decoupling component for simulating wind wave flow under a supergravity field comprises the following steps:

[0039] S1: assembling the decoupling component into a shape, connecting the sea wind, sea current and sea wave three types of dynamic loading devices with the model from top to bottom through the decoupling component according to the simulation requirement, and placing the dynamic loading devices in the model box;

[0040] In an embodiment of the present application, the multi-degree-of-freedom coupling component is determined in size according to the similar criterion, the possible displacement of the model, the size of the model and the size of the loading surface of the dynamic loading device.

[0041] Further, the model geometric scale N is determined according to the geometric size of the prototype structure, the size of the model box, the amount of material and the like, and is 50, 60, 80, 100 and 120.

[0042] The scale model is made: when the same material is used, the material properties are kept unchanged, and the scale is made; when different materials are used, the scale model is made according to the equal bending stiffness theory, i.e., the sectional bending stiffness of the scale model is N times smaller than the sectional bending stiffness of the prototype. 4

[0043] ​Similarity criterion principle: put the 1 / N scale model in a special centrifuge, so that the model bears Ng centrifugal acceleration (this force environment is called super gravity field of N times gravity acceleration), that is to ensure that the stress level of the model soil and structure is consistent with the prototype.

[0044] In an embodiment of the present application, the soil is filled in the model box and the model is installed according to the simulation requirements, and the dynamic loading device is arranged on the model box.

[0045] S2 moves and fixes the assembled model box on the centrifuge basket bottom plate, connects the test system and performs safety inspection, and then applies the sea current load by the remote control system according to the simulation requirements to simulate the action of the sea current load;

[0046] S3 continues to apply the sea wave load by the remote control system after the rotation is stable, to simulate the combined action of the sea current and sea wave load;

[0047] S4 continues to apply the sea wind load by the remote control system after the rotation is stable, to simulate the combined action of the sea current, sea wave and sea wind load, and stops the simulation after the expected duration is reached and then disassembles and inspects in sequence.

[0048] In an embodiment of the present application, the method for using the multi-degree-of-freedom decoupling component in the super gravity field for simulating ocean wind, wave and current can apply different types of loads, including the following specific cases: for impact load, especially when the structure displacement is large, the transfer ball 101 is mainly relied on to decouple out the rotational constraint to ensure its short-time high-intensity effective action; for cyclic load, the transmission rod 102 is mainly relied on to decouple out the constraint along the load transmission direction to meet its effective action; for sustained static load, the slide shaft 103 and the fixer 104 are needed to cooperate to ensure the constancy of the loading point when the structure tilts, moves or settles. Among them, the sea wind and sea current load can be set as static load, cyclic load or impact load, and the sea wave load can be set as cyclic load or impact load.

[0049] In an embodiment of the present application, the displacement conditions that may occur in the model mainly include settlement, sliding, overturning or any combination of the three.

[0050] (1) When the model only slides in the load transmission direction, the length of the transmission rod 102 needs to be ensured to meet the sliding distance requirement, that is, the decoupled degree of freedom δ1;

[0051] (2) When the model only settles, the length of the slide shaft 103 needs to be ensured to meet the settlement deformation requirement, that is, the decoupled degree of freedom δ2;

[0052] (3) When the model only slips vertically to the load transmission direction, the length of the guide rail 104-1 needs to meet the slip distance requirement, i.e. the decoupled degree of freedom δ3;

[0053] (4) When the model overturns, the rotatable range of the adapter ball 101 (i.e. the surface area of the adapter ball 101 in contact with the conducting rod 102) needs to meet the rotation angle requirement, i.e. the decoupled degrees of freedom δ12, δ13, δ23 (representing the overturning rotation in different planes, respectively);

[0054] (5) When the model has a combined displacement of the above-mentioned cases, the respective deformation size requirements need to be met simultaneously.

[0055] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0056] The above-described embodiments are only preferred modes of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A multi-degree-of-freedom decoupling member for wind wave flow simulation under a high gravity field, characterized by, The application relates to a dynamic loading device and a model (3); the decoupling component (1) has six degrees of freedom, and the decoupling component comprises a switching ball (101), a conducting rod (102), a sliding bearing shaft (103) and a fixer (104); the fixer (104) is fixedly connected with the model (3); the fixer (104) is installed at two ends of the sliding bearing shaft (103); one end of the conducting rod (102) is further installed on the sliding bearing shaft (103); the other end of the conducting rod (102) is sequentially connected with the switching ball (101) and the dynamic loading device; the fixer (104) comprises guide rails (104-1) and clamps (104-2); the two clamps (104-2) are arranged to be parallel to each other, and the two clamps (104-2) are clamped on the model (3); one end of each of the two clamps (104-2) is further provided with the guide rail (104-1); the two guide rails (104-1) are installed at two ends of the sliding bearing shaft (103) to form a horizontal movement track; the dynamic loading device comprises a sea wind dynamic loading device (201), a sea current dynamic loading device (202) and a sea wave dynamic loading device (203); the sea wind dynamic loading device (201), the sea current dynamic loading device (202) and the sea wave dynamic loading device (203) are installed on a conducting rod (102) respectively, and are used for simulating the dynamic response of the model when three different types of loads, i.e. sea wind, sea current and sea wave, act on the model simultaneously under a supergravity field; the six degrees of freedom of the decoupling component are respectively a translation along a load transmission direction delta 1, a translation in a vertical direction delta 2, a translation in a horizontal plane perpendicular to the load transmission direction delta 3, a rotation in a plane formed by the load transmission direction and the vertical direction delta 12, a rotation in a plane perpendicular to the load transmission direction delta 23 and a rotation in the horizontal plane delta 13; the switching ball (101) is used for decoupling the constraint of rotation in each direction, i.e. decoupling three degrees of freedom delta 12, delta 23 and delta 13; the conducting rod (102) is a double-layer rod piece, and can be stretched along the load transmission direction, i.e. decoupling one degree of freedom delta 1; the sliding bearing shaft (103) is a vertical rod, a sleeve is arranged on the sliding bearing shaft (103) and connected with the conducting rod (102), the sleeve drives the conducting rod (102) to move up and down along the sliding bearing shaft, and the guide rails (104-1) installed at two ends of the sliding bearing shaft (103) move horizontally along a direction perpendicular to the load transmission direction, i.e. decoupling two degrees of freedom delta 2 and delta 3. The application further relates to a simulation method of the dynamic loading device and the model (3); the method comprises the following steps: S1, assembling the decoupling component, connecting the three dynamic loading devices, i.e. the sea wind dynamic loading device (201), the sea current dynamic loading device (202) and the sea wave dynamic loading device (203), with the model from top to bottom through the decoupling component according to simulation requirements, and placing the three dynamic loading devices in a model box; S2, moving and fixing the model box on a bottom plate of a centrifuge basket, connecting a test system, and checking safety; and S3, applying a sea current load according to simulation requirements by using a remote control system after the test system is connected and checked, and simulating the action of the sea current load. ​ ​ ​ ​ ​ 2. The multi-degree-of-freedom decoupling member for simulating wind-wave flow under high gravity field according to claim 1, wherein: ​ 3. The use of the multi-degree-of-freedom decoupling member for wind wave flow simulation under high gravity field, comprising the multi-degree-of-freedom decoupling member for wind wave flow simulation under high gravity field according to any one of claims 1-2, characterized in that, ​ ​ ​ S3 The centrifuge is not stopped after rotating stably, and the sea wave load is continuously applied through the remote control system to simulate the combined action of sea current and sea wave load. S4 The centrifuge is not stopped after rotating stably, and the sea wind load is continuously applied through the remote control system to simulate the combined action of sea current, sea wave and sea wind load. After the expected duration is reached, the simulation is stopped and the centrifuge is disassembled and inspected in sequence.

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