Counterweight device for reduced scale model vibration table test

Abstract

The invention provides a counterweight device for a reduced scale model vibration table test, and belongs to the technical field of building structure dynamic tests, the counterweight device comprises a plurality of counterweight blocks and a fixing assembly, the plurality of counterweight blocks are arranged around a reduced scale model at intervals, and the counterweight blocks are in point contact with the reduced scale model; the fixing assembly is arranged on the balancing weight so that the balancing weight and the scale model can be relatively and fixedly connected. The balancing weight is in point contact with the reduced scale model, so that the friction force between the balancing weight and the reduced scale model is greatly reduced, only transverse force can be transmitted, the transmission of the transverse force is more dispersed and is closer to the inertia force distribution of a prototype structure, the longitudinal rigidity of the reduced scale model is not increased, and the accuracy of a test result is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of building structure dynamic test, and in particular to a counterweight device for scaled model vibration table test. Background Art

[0002] For the testing of building structures, except for the in-situ tests conducted directly on the prototype structure, all structural tests are model tests. The test model of a large structure is usually a scaled structure. Since the theoretical density of the model material is much larger than the actual density of the model material, in order to meet the density similarity, the scaled model needs to be weighted.

[0003] At present, for scale models of higher structures such as wind turbine towers and water towers, it is difficult to set the counterweight because they are hollow cylindrical structures. Patent document CN210269094U discloses a detachable counterweight device installed on structures such as towers. The counterweight block is fixed on an annular hoop, and the annular hoop is fixed on the model to complete the installation of the counterweight block.

[0004] However, due to the fixing method of the annular hoop, there is a large friction between the annular hoop and the model, which increases the longitudinal stiffness of the model, generates friction energy consumption, and affects the test results. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the method of fixing the counterweight block by an annular hoop in the prior art, namely, there is a large friction between the annular hoop and the model, which increases the longitudinal stiffness of the model and generates additional energy consumption, thus affecting the test results, because the present invention provides a counterweight device for scaled model vibration table test.

[0006] In order to solve the above technical problems, the present invention provides a counterweight device for scale model vibration table test, comprising:

[0007] A plurality of counterweight blocks are arranged at intervals around the scale model, and the counterweight blocks and the scale model are in point contact;

[0008] A fixing assembly is arranged on the counterweight block so that the counterweight block and the scale model are relatively fixedly connected.

[0009] Optionally, it also includes:

[0010] A rolling member is arranged between the counterweight block and the scale model, and the counterweight block and the scale model are in contact with each other through the rolling member.

[0011] Optionally, it also includes:

[0012] A mounting seat, the rolling element is rotatably arranged on the mounting seat, and the mounting seat is fixed on the counterweight block or the scale model.

[0013] Optionally, the fixing assembly includes:

[0014] A supporting platform, adapted to be connected to the scale model;

[0015] An adhesive member is disposed between the counterweight block and the support platform to bond the counterweight block and the support platform.

[0016] Optionally, the fixing assembly further includes:

[0017] A reinforcement member is arranged on the counterweight block to fix the counterweight block and the scale model relative to each other.

[0018] Optionally, the reinforcement is a binding belt, and the binding belt is used to bind the multiple counterweights synchronously.

[0019] Optionally, the support platform and the scaled model are connected by welding;

[0020] And / or, the adhesive member is foam glue or epoxy resin glue.

[0021] Optionally, a protective plate is provided on the outer side of the support platform.

[0022] Optionally, it also includes: a protective net, which is arranged on the outside of the protective plate.

[0023] Optionally, the protective net is made of flexible material.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. The counterweight device for scale model vibration table test provided by the present invention includes a counterweight block and a fixed component. A plurality of counterweight blocks are arranged at intervals around the scale model. There is point contact between the counterweight block and the scale model. The fixed component is arranged on the counterweight block to make the counterweight block and the scale model relatively fixed.

[0026] By setting point contact between the counterweight block and the scale model, the friction between the two is greatly reduced, and only lateral force can be transmitted. The propagation of lateral force is more dispersed, which is closer to the inertial force distribution of the prototype structure. The longitudinal stiffness of the scale model will not be increased, thus ensuring the accuracy of the test results.

[0027] 2. The counterweight device for scale model vibration table test provided by the present invention also includes a rolling member, which is arranged between the counterweight block and the scale model, so that the counterweight block and the scale model are in contact through the rolling member. The setting of the rolling member provides point contact conditions between the two, and the structure is simple and will not affect the counterweight effect of the counterweight block.

[0028] 3. The counterweight device for scaled model vibration table test provided by the present invention also includes a mounting seat, on which a rolling member is rotatably arranged, and the mounting seat is fixed on a counterweight block or a scaled model. The rotatable arrangement of the rolling member allows the rolling member to rotate under the vibration force during the vibration test, thereby preventing one point of the rolling member from always contacting the counterweight block or the scaled model, thereby reducing wear and increasing the service life of the counterweight device.

[0029] 4. The counterweight device for scaled model vibration table test provided by the present invention comprises a fixing assembly including a supporting platform and an adhesive. The supporting platform is suitable for connection with the scaled model. The adhesive is arranged between the counterweight block and the supporting platform. The counterweight block and the supporting platform are adhesively connected. The adhesive is simple to use and assemble, has a good fixing effect, and ensures the stability of the counterweight block during the test.

[0030] 5. The counterweight device for scaled model vibration table test provided by the present invention, the fixing assembly also includes a reinforcement piece, and the reinforcement piece is arranged on the counterweight block to further fix the counterweight block. When the adhesive piece fails accidentally, the setting of the reinforcement piece can further fix the counterweight block, so that it can continue to be arranged on the outside of the scaled model relatively stably and safely. The coordinated use of the reinforcement piece and the adhesive piece further improves the safety of the counterweight device.

[0031] 6. The counterweight device for scaled model vibration table test provided by the present invention has a reinforcement piece which is a binding belt. The setting of the binding belt can simultaneously bind multiple counterweight blocks around the scaled model. The fixing method using the binding belt is simple and quick.

[0032] 7. The counterweight device for the scaled model vibration table test provided by the present invention has a welding connection between the support platform and the scaled model. The welding connection has high strength and good stability, and the welding connection is less limited by the overall shape and structure, and can adapt to scaled models with circular cross-sections, square cross-sections or polygonal cross-sections.

[0033] The adhesive parts are foam glue or epoxy resin glue. Foam glue can be quickly positioned and has high strength, ensuring the stability of the connection. It has strong adhesion and a simple construction method without the need for complicated procedures. At the same time, foam glue has a certain degree of shock resistance and can better adapt to vibration tests. Epoxy resin glue can be strongly and firmly bonded, can quickly form a strong bond on the metal surface, and has excellent shear strength, which can better maintain the integrity of the structure when subjected to stress.

[0034] 8. The counterweight device for scale model vibration table test provided by the present invention has a protective plate arranged on the outer side of the support platform. The setting of the protective plate further provides protection to prevent the counterweight block from sliding off the support platform to cause safety hazards and affect the test results.

[0035] 9. The counterweight device for scaled model vibration table test provided by the present invention also includes a protective net, which is arranged on the outside of the protective plate. Under normal conditions, the protective net neither generates tension on the scaled model nor can it intercept the counterweight block when the counterweight block accidentally flies out.

[0036] 10. The counterweight device for scaled model vibration table test provided by the present invention has a protective net made of flexible material, which can be deformed freely and provides sufficient tension when tightened to intercept the falling counterweight block, thereby providing all-round protection for the counterweight block. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a structural schematic diagram of a specific implementation mode of a counterweight device for a scaled model vibration table test provided in an embodiment of the present invention;

[0039] Figure 2 for Figure 1 A local enlarged schematic diagram in FIG.

[0040] Figure 3 for Figure 2 A partial enlarged schematic diagram of

[0041] Figure 4 for Figure 2 Schematic diagram of the top view structure.

[0042] Description of reference numerals:

[0043] 1. Support platform; 2. Scale model; 3. Counterweight; 4. Rolling parts; 5. Mounting seat; 6. Fixed assembly; 7. Adhesive parts; 8. Reinforcement parts; 9. Protective plate; 10. Protective net. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] The loading process of the vibration table test is often accompanied by violent vibrations, which can easily cause relative vibrations between the counterweight and the structure, resulting in collisions, frictions and energy consumption that do not exist in the real structure, affecting the accuracy of the test results. In severe cases, it may cause the counterweight to fall off and cause safety accidents.

[0049] Currently, there are two methods of tying counterweights with wire and placing counterweights on a counterweight platform. Both have different limitations. The counterweight block is directly tied with wire, relying on the tension of the wire and the friction between the counterweight block and the cylinder wall to prevent the counterweight block from slipping. The structure is simple and will increase the structural rigidity. The wire and the counterweight block are prone to sliding, and the bearing capacity and stability are poor. It is not suitable when the counterweight is large; the counterweight block is placed on the counterweight platform, relying on the surface of the cylinder wall to connect the counterweight platform. The counterweight block is connected to the counterweight platform, and the inertial force is transmitted to the main body through the platform. This scheme will cause the inertial force of the nearby section to be concentrated in the short section corresponding to the thickness of the counterweight platform, causing stress concentration at the corresponding position and weakening the structural strength.

[0050] The counterweight device for scaled model vibration table test provided in this embodiment is used in vibration table tests of wind power structures such as single-tube, lattice, and conductor frame wind power structures, and not only has accurate test results but also has relatively stable protection.

[0051] like Figures 1 to 4As shown, a specific implementation of the counterweight device for the scale model vibration table test provided in this embodiment includes a plurality of counterweight blocks 3 and a fixing assembly 6. The plurality of counterweight blocks 3 are arranged at intervals around the scale model 2, and there is point contact between the counterweight blocks 3 and the scale model 2; the fixing assembly 6 is arranged on the counterweight blocks 3 so that the counterweight blocks 3 and the scale model 2 are relatively fixedly connected.

[0052] By setting the counterweight block 3 and the scaled model 2 as point contact, the friction between the two is greatly reduced, and only lateral force can be transmitted. The propagation of lateral force is more dispersed, which is closer to the inertial force distribution of the prototype structure. The longitudinal stiffness of the scaled model 2 will not be increased, thus ensuring the accuracy of the test results.

[0053] In a specific implementation of the counterweight block 3, the counterweight block 3 is a rectangular block structure, and the counterweight block 3 can also be a cylindrical block structure. When selecting the mass of the counterweight block 3, the scaled model 2 is first divided into different sections, and the mass of each section is calculated based on the mass of the prototype structure and the mass similarity relationship. The counterweight block 3 is arranged on the surface of the scaled model 2 as evenly as possible.

[0054] Specifically, the specific structure of the scaled model 2 is not limited, and it can be a single cylinder or a combination thereof, such as a single cylinder structure, a conductor frame structure, a double steel tube sandwich concrete structure, and the shape of the horizontal cross-section of the cylinder model is cylindrical, polygonal or chamfered polygonal.

[0055] Specifically, the point contacts between each counterweight block 3 and the scale model 2 are arranged in a plurality of evenly distributed positions to ensure the stability of the contacts.

[0056] like Figure 3 As shown, the counterweight device for scaled model vibration table test provided in this embodiment further includes a rolling member 4, which is arranged between the counterweight block 3 and the scaled model 2, and the counterweight block 3 and the scaled model 2 are in contact through the rolling member 4.

[0057] The setting of the rolling element 4 provides a point contact condition between the two, and has a simple structure and will not affect the balancing effect of the balancing weight block 3.

[0058] Specifically, the rolling element 4 is a structure with an arc-shaped protrusion, such as a pulley or a ball.

[0059] like Figure 3 As shown, the counterweight device for scaled model vibration table test provided in this embodiment further includes a mounting seat 5, the rolling member 4 is rotatably arranged on the mounting seat 5, and the mounting seat 5 is fixed on the counterweight block 3 or the scaled model 2.

[0060] The rotating setting of the rolling element 4 allows the rolling element 4 to rotate under the vibration force during the vibration test, avoiding one point of the rolling element 4 from always contacting the counterweight block 3 or the scale model 2, reducing wear and increasing the service life of the counterweight device.

[0061] Specifically, there is no limitation on the installation position of the mounting seat 5. When it is installed on the counterweight block 3, the rolling member 4 abuts against the scale model 2. When it is installed on the scale model 2, the rolling member 4 abuts against the counterweight block 3. Preferably, the mounting seat 5 is arranged on the counterweight block 3 to facilitate the use of the counterweight device on different scale models 2.

[0062] The specific structure of the mounting seat 5 is not limited. In one embodiment, the mounting seat 5 includes a mounting plate and two connecting plates arranged on the mounting plate, a rotating shaft is arranged between the two connecting plates, and the rolling element 4 is rotatably arranged on the rotating shaft. The mounting seat 5 can be fixed on the counterweight block 3 or the scale model 2 by bonding or bolting.

[0063] In other embodiments, the mounting seat 5 may not be provided, and a slot may be directly opened on the side wall of the counterweight block 3, and the rolling element 4 may be embedded in the slot.

[0064] like Figure 2 and Figure 3 As shown, the counterweight device for scale model vibration table test provided in this embodiment, the fixing assembly 6 includes a supporting platform 1 and an adhesive 7, the supporting platform 1 is suitable for connecting with the scale model 2; the adhesive 7 is arranged between the counterweight block 3 and the supporting platform 1, so that the counterweight block 3 and the supporting platform 1 are adhesively connected.

[0065] The support platform 1 and the adhesive member 7 are easy to use and assemble, and have a good fixing effect, thereby ensuring the stability of the counterweight 3 during the test. The support is provided by the support platform 1, which provides better safety.

[0066] Among them, when calculating the counterweight, the mass of the support platform 1 is included in the mass of the counterweight; and the plate thickness of the support platform 1 should meet the shear and bending verification under the vertical inertia force of the counterweight block. The support platform 1 is not provided with stiffening ribs or the height of the stiffening ribs is minimized to avoid increasing the longitudinal stiffness of the structure, or the section with increased longitudinal stiffness is minimized to reduce the impact on the entire model.

[0067] A specific implementation of the support platform 1, a through hole is set in the middle of the support platform 1, the structure of the through hole is adapted to the structure of the scaled model 2, the support platform 1 is sleeved on the scaled model 2, and the counterweight blocks 3 of this layer are all set on the support platform 1.

[0068] In addition, as an alternative embodiment, there are multiple supporting platforms 1, and each counterweight block 3 corresponds to one supporting platform.

[0069] In the counterweight device for scaled model vibration table test provided in this embodiment, the adhesive member 7 is foam glue.

[0070] Foam glue can be quickly positioned and has high strength, ensuring the stability of the connection. It has strong adhesion and a simple construction method without the need for complicated procedures. At the same time, foam glue has a certain degree of shock resistance, which allows it to better adapt to vibration tests.

[0071] In addition, as an alternative embodiment, the adhesive 7 is epoxy resin glue, which can perform strong and firm bonding, can quickly form a solid bond on the metal surface, and has excellent shear strength, and can better maintain the integrity of the structure when subjected to stress.

[0072] like Figure 3 and Figure 4 As shown, the counterweight device for scale model vibration table test provided in this embodiment, the fixing assembly 6 also includes a reinforcement 8, and the reinforcement 8 is arranged on the counterweight block 3 to relatively fix the counterweight block 3 and the scale model 2. When the adhesive 7 fails accidentally, the setting of the reinforcement 8 can further fix the counterweight block 3, so that it continues to be relatively stably and safely set outside the scale model 2. The coordinated use of the reinforcement 8 and the adhesive 7 further improves the safety of the counterweight device.

[0073] like Figure 4 As shown, in the counterweight device for scaled model vibration table test provided in this embodiment, the reinforcing member 8 is a binding belt, and the binding belt is used to bind the plurality of counterweight blocks 3 synchronously, and the fixing method using the binding belt is simple and quick.

[0074] Specifically, the binding belt is made of a flexible material that is not easily stretched or deformed, such as polyester or nylon, and can fit tightly with the counterweight 3 to increase the firmness of the binding. The number of binding belts should ensure that the binding belt can withstand the lateral inertia force of the counterweight 3 alone without considering the effect of the adhesive 7.

[0075] The counterweight device for scaled model vibration table test provided in this embodiment has a welding connection between the support platform 1 and the scaled model 2. The welding connection has high strength and good stability, and the welding connection is less limited by the overall shape and structure, and can adapt to scaled models with circular cross-sections, square cross-sections or polygonal cross-sections.

[0076] In addition, as an alternative implementation, the support platform 1 and the scaled model 2 may be fixedly connected by bolts.

[0077] like Figure 2 and Figure 4As shown, the counterweight device for scaled model vibration table test provided in this embodiment has a protective plate 9 arranged on the outer side of the support platform 1. The setting of the protective plate 9 further provides protection to prevent the counterweight block 3 from sliding off the support platform 1 to cause safety hazards and affect the test results.

[0078] like Figure 1 and Figure 2 As shown, the counterweight device for scaled model vibration table test provided in this embodiment also includes: a protective net 10, which is arranged on the outside of the protective plate 9 and loosely wrapped on the outside of the scaled model 2. During installation, it is necessary to adjust the looseness of the protective net to ensure that the protective net is not tightened when no counterweight block 3 falls off.

[0079] The protective net 10 does not generate tension on the scale model 2 under normal conditions, and can also intercept the counterweight block 3 when the counterweight block 3 accidentally flies out, thereby having a good protective effect.

[0080] In the counterweight device for scaled model vibration table test provided in this embodiment, the protective net 10 is made of flexible material and can be deformed freely. When tightened, it provides sufficient tension to intercept the counterweight block 3 that falls off, thereby providing all-round protection for the counterweight block 3.

[0081] Specifically, the protective net can be made of nylon, and the mesh size of the protective net needs to be such that the counterweight 3 cannot pass through.

[0082] In the force transmission analysis of the counterweight block 3 in this embodiment, the vertical inertia force of the counterweight block 3 is transmitted to the scale model 2 through the support platform 1, and the lateral inertia force is transmitted to the scale model 2 through the rolling element 4 and the support platform 1, and the force transmission path is clear.

[0083] Compared with the conventional counterweight platform solution, the propagation of lateral force is more dispersed and closer to the inertial force distribution of the prototype structure; compared with the wire binding solution, the friction between the counterweight block 3 and the scaled model 2 is small, almost frictionless, and no coordinated tensile and compressive deformation will occur, which will not increase the longitudinal stiffness of the structure. In addition, the binding belt in this embodiment is more flexible than the wire, has a firmer contact with the counterweight block 3, and is supported by the support platform 1 at the bottom, so it has better stability and safety.

[0084] At the same time, the counterweight device provided in this embodiment has sufficient safety protection to reduce the safety hazards caused by the accidental falling of the counterweight 3. Adhesive 7, reinforcement 8, protective plate 9 and protective net 10 constitute multi-layer protection. Adhesive 7 bonds the bottom of the counterweight 3 to the support platform 1. When it is not invalid, the counterweight 3 and the support platform 1 will not slide relative to each other; reinforcement 8 binds the counterweight 3 to the surface of the scale model 2. When it is not invalid, the counterweight 3 will not move significantly; protective plate 9 is connected to the periphery of the support platform 1, limiting the horizontal sliding range of the counterweight 3; protective net 10 is loosely tied to protective plate 9. When the counterweight 3 does not fly over the protective plate 9, the protective net 10 does not generate tension on the structure, which can be ignored. When the counterweight 3 falls off and flies out, the protective net 10 is tightened to intercept the counterweight 3.

[0085] The counterweight device for scaled model vibration table test provided in this embodiment is safe and stable, has clear force transmission, has multiple protection measures, does not significantly enhance or weaken the structural performance, and has a simple structure. It is easy to implement in the vibration table test and is suitable for various forms of wind turbine tower scaled model vibration table tests.

[0086] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present invention.

Claims

1. A counterweight device for scale model vibration table test, characterized in that: include: A plurality of counterweight blocks (3) are arranged at intervals around the scale model (2), and the counterweight blocks (3) and the scale model (2) are in point contact; A fixing assembly (6) is arranged on the counterweight block (3) so that the counterweight block (3) and the scale model (2) are relatively fixedly connected.

2. The counterweight device for scale model vibration table test according to claim 1, characterized in that: Also includes: A rolling member (4) is arranged between the counterweight block (3) and the scale model (2); the counterweight block (3) and the scale model (2) are in contact with each other through the rolling member (4).

3. The counterweight device for scale model vibration table test according to claim 2, characterized in that: Also includes: A mounting seat (5), the rolling element (4) is rotatably arranged on the mounting seat (5), and the mounting seat (5) is fixed on the counterweight block (3) or the scale model (2).

4. The counterweight device for scale model vibration table test according to claim 1, characterized in that: The fixing assembly (6) comprises: A supporting platform (1) adapted to be connected to the scaled model (2); An adhesive component (7), wherein the adhesive component (7) is arranged between the counterweight block (3) and the support platform (1) so as to enable the counterweight block (3) and the support platform (1) to be adhesively connected.

5. The counterweight device for scale model vibration table test according to claim 4, characterized in that: The fixing assembly (6) further comprises: A reinforcing member (8), wherein the reinforcing member (8) is arranged on the counterweight block (3) so as to relatively fix the counterweight block (3) and the scale model (2).

6. The counterweight device for scale model vibration table test according to claim 5, characterized in that: The reinforcing member (8) is a binding belt, and the binding belt is used to bind the plurality of counterweight blocks (3) synchronously.

7. The counterweight device for scale model vibration table test according to claim 4, characterized in that: The support platform (1) and the scaled model (2) are connected by welding; And / or, the adhesive member (7) is foam glue or epoxy resin glue.

8. The counterweight device for scale model vibration table test according to claim 4, characterized in that: A protective plate (9) is provided on the outer side of the support platform (1).

9. The counterweight device for scale model vibration table test according to claim 8, characterized in that: Also includes: A protective net (10) is arranged outside the protective plate (9).

10. The counterweight device for scale model vibration table test according to claim 9, characterized in that: The protective net (10) is made of flexible material.

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