Device capable of regulating and controlling shaking of internal block in dynamic response test of solid-liquid periodic structure and test method thereof

Abstract

The invention belongs to the technical field of structural vibration characteristic testing, and relates to a device capable of regulating and controlling shaking of an internal block in a dynamic response test of a solid-liquid periodic structure and a testing method of the device. The device comprises an experiment bench, a motor excitation system and a connecting rod system. The experiment bench is used for supporting the connecting rod system and can limit the degree of freedom of the control rod in different directions through the limiting bolts. The motor excitation system comprises a motor, a transmission pulley, a transmission rod, a guide rail and a motion platform, and the motion platform performs reciprocating translational motion at a specified frequency through the transmission system; the connecting rod system comprises a control rod and a connecting rod, and the control rod is used for connecting the motor excitation system and transmitting an excitation signal to the connecting rod; the upper portion of the connecting rod is connected with the control rod, and the lower end of the connecting rod is connected with a solid part in the structure, receives signals transmitted by the control rod and is connected with an internal solid block to do reciprocating translational motion at specified frequency. The problem that the internal shaking effect caused by external disturbance factors is difficult to simulate in the dynamic response test of the solid-liquid structure is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of structural vibration characteristic testing, and specifically relates to a device capable of regulating the shaking of an internal block in a solid-liquid periodic structure dynamic response test and a testing method thereof. Background Art

[0002] Solid-liquid structures that contain both fluid and solid inside are widely used in industry, such as various storage tank equipment, piping systems, and cooling systems for large equipment. They play an important role in ensuring the safe production of equipment, transporting raw materials, and saving energy and reducing emissions. However, mechanical vibration and environmental noise problems are common and increasingly prominent during the normal operation or transportation of such structures. Vibration interference from the external environment and the flutter of the equipment itself during high-power operation can cause the solid and fluid parts inside the structure to shake, thereby changing the vibration characteristics of the overall structure, seriously affecting the normal working performance, working accuracy, and working efficiency of the equipment, and also posing a great safety hazard.

[0003] Vibration characteristic testing experiments can verify the correctness of the designed theoretical model, obtain the relevant physical characteristics of the structure, and provide a basis for the vibration isolation design and optimization of the structure. Currently, most vibration characteristic testing experiments are carried out under the condition that the structure is stationary relative to the test bench. Excitation is applied to one end of the structure. The response signals at the excitation position and the other end are obtained through sensors. The results are processed to obtain the vibration characteristics of the structure.

[0004] However, this type of testing method fails to consider factors such as external environmental interference and vibrations during the operation of large equipment in specific practical applications. These factors can cause the solid portion of the structure to wobble relative to the external matrix, deviating from normal operating conditions and thus altering the overall structural vibration characteristics. Although vibration characteristic testing involves excitation by an exciter, the excitation amplitude is generally low and localized, as the experiment requires the entire structure to remain as still as possible relative to the test bench during testing. This makes it difficult to simulate the internal sloshing effects of solid-liquid structures caused by external disturbances in real-world applications.

[0005] If the movement of the solid blocks inside the structure can be controlled during experimental testing to avoid affecting the static relationship of the external matrix relative to the test bench, the solid blocks inside the structure and the external matrix can be made to move relative to each other, effectively simulating the impact of the shaking effect caused by external disturbances on the structure, while also meeting the requirements of experimental testing of structural vibration characteristics.

[0006] Therefore, it is necessary to develop an experimental device that can control the shaking of solid blocks inside solid-liquid structures, simulate the internal shaking effect of such structures caused by external interference, and then conduct vibration characteristic test experiments on the overall structure without affecting the external matrix, providing a basis for the changing law of the vibration characteristics of the structure when it is affected by the shaking effect. Summary of the Invention

[0007] The purpose of the present invention is to provide a device and a testing method for controlling the internal block shaking in the solid-liquid periodic structure dynamic response test, which solves the problem that it is difficult to simulate the internal shaking effect caused by external disturbance factors in the solid-liquid structure dynamic response test.

[0008] The present invention is achieved through the following technical solutions: The present invention discloses a device capable of regulating the sway of an internal block in a dynamic response test of a solid-liquid periodic structure, which is characterized by comprising a test bench, a motor excitation system and a connecting rod system; The experimental bench comprises two brackets perpendicular to the ground, with vertical slots opened in the brackets; The linkage system includes a control rod and multiple connecting rods. The control rod is installed through the vertical slot and is in a suspended state. The upper end of the connecting rod is connected to the control rod, and the lower end is connected to the internal solid block in the structure to be tested. A vertical limit structure is installed in the vertical slot to limit the freedom of the control rod in the vertical direction; A horizontal limit structure is installed at the end of the control rod to limit the freedom of the control rod in the horizontal direction; The motor excitation system is connected to the control rod and is used to drive the control rod to perform reciprocating translational motion in the vertical or horizontal direction, transmit the excitation signal to the connecting rod, and the connecting rod drives the internal solid block to perform reciprocating translational motion at a specified frequency.

[0009] Furthermore, the motor excitation system includes a motor, a transmission pulley, a transmission rod, a guide rail and a motion platform; The transmission pulley is connected to the output shaft of the motor, one end of the transmission rod is fixed to the transmission pulley, and the other end is fixed to the motion platform; the motion platform is fixedly connected to the end of the control rod and can slide on the guide rail; When the motor drives the motion platform to slide, it drives the control rod to move.

[0010] Furthermore, the motion platform is fixedly connected to the end of the control rod through a connecting bolt.

[0011] Furthermore, the motor excitation system is connected to one end or both ends of the control rod.

[0012] Furthermore, the vertical limiting structure is as follows: a set of stud bolts are installed in the vertical slots of each bracket to limit the vertical position of the control rod; The horizontal limit structure includes an inner limit rod and an outer limit rod. The inner limit rod is located on the inner side of the test bench, and the outer limit rod is located on the outer side of the test bench, which is used to limit the horizontal direction of the control rod.

[0013] Furthermore, the limiting rod is fixed to the rod body of the control rod through a limiting bolt.

[0014] Furthermore, the control rod is connected to the connecting rod through a hollow rivet.

[0015] Furthermore, when the control rod is subjected to horizontal reciprocating motion at a specified frequency, stud bolts are placed on the upper and lower sides of the control rod at a distance equal to the diameter of the control rod and fixed by nuts to limit the vertical displacement of the control rod; The distance between the two limit rods installed on the control rod is d. The control rod moves horizontally between the limit rods, and the maximum displacement does not exceed the distance d.

[0016] Furthermore, when the control rod is subjected to reciprocating motion at a specified frequency in the vertical direction, stud bolts are respectively placed on the upper and lower sides of the control rod. The distance between the two stud bolts is the diameter of the control rod plus the maximum vertical displacement d of the internal solid block relative to the external base, and they are fixed by nuts.

[0017] The present invention also discloses a testing method for a device capable of controlling the sway of an internal block in a dynamic response test of a solid-liquid periodic structure. The types of sway effects on the solid-liquid periodic structure are divided into two types: horizontal sway and vertical sway. When the test requirement requires determining that the type of sloshing effect on the solid-liquid periodic structure is horizontal sloshing, the specific steps include: According to the dimensional parameters of the structure to be tested, the position of the experimental bench is determined and fixed, the position of the exciter is determined and fixed, the position of the structure to be tested is determined and the corresponding boundary conditions are constrained, and sensors are attached to the corresponding positions of the structure to be tested. The height of the control rod is determined and constrained by the vertical limit structure. After determining the horizontal position of the control rod, the horizontal limit structure is installed. The control rod is connected to the solid block inside the structure to be tested through a connecting rod, and the motor excitation system is installed at the end of the control rod; When the motor excitation system is running smoothly, it is observed that the internal solid block reciprocates horizontally at a specified frequency while the external matrix remains stationary. The exciter is turned on, and the response signal is received through the sensor. The data is processed to obtain the dynamic response characteristics of the structure under test when subjected to horizontal shaking effects. When the test requirement requires determining that the type of sloshing effect on the solid-liquid periodic structure is vertical sloshing, the specific steps include: Based on the dimensional parameters of the structure to be tested, the position of the test bench is determined and fixed, the position of the exciter is determined and fixed, the position of the structure to be tested is determined and the corresponding boundary conditions are constrained, and sensors are attached to the corresponding positions of the structure to be tested. The height of the control rod is determined, and the distance between the vertical limit structures at the upper and lower ends of the control rod is the diameter of the control rod plus the maximum relative displacement of the internal solid block relative to the external base; After determining the horizontal position of the control rod, install the horizontal limit structure to constrain the horizontal direction; Connecting the control rod to the solid block inside the structure being measured through a connecting rod, and installing a motor excitation system at the end of the control rod; When the motor excitation system is running smoothly, it is observed that the internal solid block reciprocates in the vertical direction at a specified frequency while the external matrix remains stationary. The exciter is turned on, and the response signal is received through the sensor. The data is processed to obtain the dynamic response characteristics of the structure under test when it is subjected to the vertical shaking effect.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention discloses a device and a testing method for controlling the shaking of internal blocks in a solid-liquid periodic structure dynamic response test. The present invention simulates the influence of the external environment and, for a solid-liquid structure containing both solid and fluid media, can control the solid blocks inside the structure to perform reciprocating motion in a specified direction and at a specified frequency, thereby enabling the overall structure to be tested for vibration characteristics when shaking occurs inside the structure without affecting the stationary condition of the external structure relative to the test bench. Compared with the current vibration characteristic testing method, a set of motor excitation systems and connecting rod systems are added to control the solid part inside the structure to perform specified motion, simulating the relative motion between the internal solid blocks and the external matrix part of the structure under external interference, while also meeting the requirement of the vibration characteristic test experiment that the entire structure to be tested remains as stable as possible relative to the test bench. The present invention simulates the influence of the external environment and uses an experimental device to cause the internal solid blocks of the structure to move relative to the matrix. This device can implement a vibration characteristic test experiment on the overall structure under the influence of external interference, explore the changing law of the vibration characteristics of the overall structure when the internal solid and the external matrix move relative to each other, and provide a basis for the design of improving the stable operation of major equipment.

[0019] During normal operation, the external base remains stationary on the ground. The device designed in this invention controls only the movement of the internal solid block, while the external base remains stationary. This allows the internal solid block and the external base to move relative to each other, simulating the sloshing effect of the internal solid block in the fluid. Maintaining the external base stationary relative to the ground is a requirement of dynamic response testing. Based on this consideration, the device designed in this invention controls the movement of the internal solid block to simulate the sloshing effect without affecting the movement of the external base. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute undue limitations thereon. It should be noted that, in order to simplify and clarify the drawings and facilitate a better understanding of the present invention, the overall three-dimensional schematic diagram of the equipment structure only shows the connection between the internal solid block portion and the connecting rod, omitting the schematic diagram of the overall external base portion. A separate diagram will be provided for the structure being measured. In the accompanying drawings: Figure 1 It is a schematic diagram of the three-dimensional structure of the device for applying a horizontal reciprocating motion of a specified frequency to a solid block according to the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the device for applying a vertical reciprocating motion of a specified frequency to a solid block according to the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the experimental platform system for supporting the overall equipment and the connecting rod system for transmitting motion according to the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the motor excitation system of the present invention for applying a reciprocating translational motion of a specified excitation frequency to the connecting rod system; Figure 5 yes Figure 3 Front cross-sectional view of Figure 6 yes Figure 4 Front cross-sectional view of Figure 7 is a top view of a structural unit cell in the embodiment; Figure 8 is a front cross-sectional view of a structural unit cell in the embodiment; Figure 9 1. is a schematic diagram of a one-dimensional finite period structure in an embodiment; Figure 10 yes Figure 9 Front cross-sectional view of .

[0021] Among them: 1. Experimental bench; 2. Guide rail; 3. Motion platform; 4. Motor; 5. Transmission pulley; 6. Transmission rod; 7. Connecting bolt; 8. Limit rod; 9. Limit bolt; 10. Hollow rivet; 11. Connecting rod; 12. Internal solid block; 13. Control rod; 14. Stud bolt; 15. Nut; 16. External matrix; 17. One-dimensional finite period solid-liquid structure. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following is a further detailed description with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. That is, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0023] The components described and illustrated in the drawings and embodiments of the present invention may be arranged and designed in a variety of different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. All other embodiments derived by those skilled in the art based on the drawings and embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, element, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to the process, element, method, article or device. In addition, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the drawings, and are only for the purpose of better describing the present invention, rather than requiring the devices, components or devices shown to have such a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0026] The present invention discloses a device capable of regulating the shaking of internal blocks in a dynamic response test of a solid-liquid periodic structure. The device is an experimental device that simulates the influence of the external environment and causes the internal solid block part of a structure containing both solid and fluid media to move in a specified direction and at a specified frequency. The device comprises an experimental bench 1, a motor excitation system and a connecting rod system.

[0027] It should be noted that the structure to be tested in the embodiment is only for better describing the present invention, rather than being a necessary structure for testing the present invention, and therefore should not be understood as limiting the present invention.

[0028] like Figure 7-10 As shown, the structure to be tested in the embodiment is a 1x6 one-dimensional finite period solid-liquid structure 17, and the overall structure is composed of the same 6 unit cells arranged in one dimension. Figure 7 and Figure 8The external matrix 16 of each unit cell system is a cube with a size parameter of a. An internal solid block 12 is provided inside the external matrix 16. The internal solid block 12 is also a cube with a size parameter of b. The wall thickness of the external matrix 16 is c. The maximum relative displacement parameter between the internal solid block 12 and the external matrix 16 is d=ab-2c.

[0029] The outer matrix 16 is filled with fluid, and the inner solid block 12 is suspended in the outer matrix 16 .

[0030] like Figure 10 As shown, taking the horizontal direction as an example: the internal solid block 12 is located at the center of the external base 16. At this time, the internal solid block 12 can move left or right at most d / 2; however, if the internal solid block 12 moves from the leftmost end (i.e., about to contact the left inner side of the external base 16) to the rightmost end (i.e., about to contact the right inner side of the external base 16), during this process, the external base 16 remains stationary relative to the ground, and the maximum displacement of the internal solid block 12 relative to the external base 16 is d (i.e., the length of all blank areas in the horizontal direction). Therefore, the maximum relative displacement parameter described here is d=ab-2c.

[0031] The maximum displacement parameter between the internal solid block 12 and the external matrix 16 is described here because this parameter is related to the design of the transmission pulley 5. When the motor 4 is running, the connection between the transmission pulley 5 and the transmission rod 6 performs periodic rotational motion, and the diameter of the motion is consistent with the relative maximum displacement.

[0032] The unit cell structure of the present invention is a symmetrical structure, and the maximum displacement parameter in the vertical direction is consistent with the calculation method and result in the horizontal direction.

[0033] like Figure 1 As shown, the experimental bench 1 includes two brackets whose lower ends can be fixed to the platform and matching bolts. Both brackets are prefabricated with vertical slots for adjusting the position of the bolts and providing a moving track for the control rod 13. The bolts are divided into two groups, one group is installed in the vertical slots of the brackets, which can limit the vertical movement of the control rod 13, and the other group is installed in the through-hole position at the end of the control rod 13, which can limit the horizontal movement of the control rod 13.

[0034] like Figure 1 、 Figure 2 and Figure 4As shown, the motor excitation system includes a motor 4, a transmission pulley 5, a transmission rod 6, a guide rail 2, and a motion platform 3. The guide rail 2 is a linear motion guide rail that allows the motion platform 3 to perform linear translational motion on its track. The motor 4 can be set to a specified excitation frequency according to test requirements. The motor 4 transmits the rotational torque to the transmission rod 6 through the transmission pulley 5. One end of the transmission rod 6 is connected to the transmission pulley 5 and rotates with the transmission pulley 5. The other end is connected to the motion platform 3 and can perform translational motion with the motion platform 3. The transmission pulley 5 and transmission rod 6 can convert the excitation provided by the motor 4 into reciprocating translational motion of the motion platform 3 on the guide rail 2. The motion platform 3 is mounted on the control rod 13 via the connecting bolt 7.

[0035] It should be noted that the reciprocating mechanism consisting of drive pulley 5 and drive rod 6 converts the rotational torque directly provided by motor 4 into reciprocating translational motion of motion platform 3. The connection between drive pulley 5 and drive rod 6 undergoes periodic rotational motion during operation. The diameter of this rotational motion is consistent with the maximum displacement of motion platform 3 caused by drive rod 6 in translational motion, and also with the maximum displacement of the internal solid block 12 of the structure under test caused by control rod 13 in a specified motion. Therefore, the size of drive pulley 5 is determined by the unit cell parameters of the structure under test. The signal frequency set by motor 4 is the same as the reciprocating frequency of motion platform 3's translational motion. Different excitation frequencies can be set for motor 4 according to test requirements to simulate the influence of different degrees of internal sloshing effects on the overall solid-liquid structure. like Figure 1 、 Figure 2 、 Figure 3 and Figure 5 As shown, the connecting rod system includes a control rod 13 and a connecting rod 11. The control rod 13 has equally spaced through holes opened in the vertical direction in the middle part and mounting holes for installing connecting bolts 7 at both ends. It should be noted that: the size of the through hole matches the outer diameter of the hollow rivet 10 used to connect the control rod 13 and the connecting rod 11, and the spacing between the equally spaced through holes is determined by the size parameters of the unit cell of the one-dimensional finite period solid-liquid structure 17.

[0036] A control rod 13 is suspended between the two test stands 1. The upper end of a connecting rod 11 is connected to the control rod 13 via a hollow rivet 10, and the lower end is connected to the structure's internal solid block 12, driving the internal solid block 12 and the control rod 13 to perform the same translational motion. During movement, the control rod 13 drives the connecting rod 11, which in turn drives the internal solid block 12. The control rod 13, connecting rod 11, and internal solid block 12 all move in unison, while the external base 16 remains stationary relative to the ground.

[0037] Because the connecting rod 11 can move, Figure 7 As shown, the outer base 16 has a cross-shaped groove on the upper surface to facilitate the movement of the connecting rod 11.

[0038] It should be noted that: the control rod 13 receives the excitation signal provided by the motor excitation system to drive the connecting rod 11 and the internal solid block 12 to perform corresponding reciprocating translational motion, and a material with high strength and good toughness should be selected; the connecting rod 11 is used to connect the control rod 13 and the internal solid block 12. Considering that the influence of the connecting rod 11 on the overall mass and stiffness of the measured structure should be minimized as much as possible, the connecting rod 11 should meet the requirements of light weight, good toughness and small size.

[0039] Specifically, the bolts are divided into limit bolts 9 and stud bolts 14. When used to limit the vertical position of the control rod 13, a set of stud bolts 14 is installed in the vertical slot of each bracket of the test bench 1, and the control rod 13 passes through the upper and lower stud bolts 14. When used to limit the horizontal direction of the control rod 13, limit rods 8 are installed at both ends of the control rod 13, which are divided into an inner limit rod and an outer limit rod. The inner limit rod is located on the inner side of the experimental bench 1, and the outer limit rod is located on the outer side of the experimental bench 1, which plays a limiting role.

[0040] Specifically, the limiting rod 8 is fixed to the rod body of the control rod 13 through the limiting bolt 9 .

[0041] like Figure 1 As shown, the motor excitation system applies a horizontal reciprocating motion of a specified frequency to the control rod 13: the stud bolts 14 on the experimental bench 1 are respectively placed on the upper and lower sides of the control rod 13, with a distance equal to the diameter of the control rod 13, and are fixed by nuts 15; the limit rod 8 and the limit bolt 9 on the control rod 13 are installed and fixed in the position shown in the figure, and the limit bolt 9 is installed in two vertical holes pre-opened in the control rod 13, with a distance d between the two holes. The limit rod 8 is installed with the lower end of the limit bolt 9, so the horizontal displacement of the control rod 13 will only move between the limit rods 8, and the maximum displacement will not exceed the distance d between the two holes. The transmission rod 6, guide rail 2 and moving platform 3 are placed horizontally through connecting bolts 7. The guide rail 2 and moving platform 3 are parallel to the control rod 13. One end of the transmission rod 6 is connected to the transmission pulley 5, and the other end is connected to the moving platform 3. The transmission pulley 5 is installed on the transmission shaft of the motor 4. After the motor 4 sets the excitation frequency and is turned on, the transmission shaft of the motor 4 rotates, and the connection between the transmission pulley 5 and the transmission rod 6 rotates with the same period as the transmission shaft. The diameter of the movement is d. The transmission rod 6 drives the moving platform 3 to move, and then drives the control rod 13 to reciprocate in the horizontal direction. The control rod 13 drives the internal solid blocks 12 of multiple cells installed thereon to move horizontally. The frequency of the reciprocating motion of the internal solid block 12 in the horizontal direction is consistent with the periodic frequency of the rotational motion of the transmission pulley 5, and is also consistent with the rotation frequency set by the motor 4.

[0042] like Figure 2As shown, the motor excitation system applies a reciprocating motion of a specified frequency in the vertical direction to the control rod 13: the stud bolts 14 on the experimental bench 1 are respectively placed on the upper and lower sides of the control rod 13, and the distance between them is the diameter of the control rod 13 plus the maximum vertical displacement d of the internal solid block 12 relative to the external base 16, and are fixed by nuts 15. The transmission rod 6, the guide rail 2 and the motion platform 3 are placed vertically by connecting bolts 7. The guide rail 2 and the motion platform 3 are perpendicular to the control rod 13. One end of the transmission rod 6 is connected to the transmission pulley 5, and the other end is connected to the motion platform 3. The transmission pulley 5 is installed on On the motor drive shaft, after the motor 4 sets the excitation frequency and is turned on, the motor 4 drive shaft rotates, and the connection between the transmission pulley 5 and the transmission rod 6 rotates with the same period as the transmission shaft. The diameter of the movement is d. The transmission rod 6 drives the motion platform 3 to move, and then drives the control rod 13 to reciprocate in the vertical direction. The control rod 13 drives the internal solid blocks 12 of the multiple units installed thereon to move vertically. The frequency of the reciprocating motion of the internal solid blocks 12 in the vertical direction is consistent with the periodic frequency of the rotational motion of the transmission pulley 5, and is also consistent with the rotation frequency set by the motor 4.

[0043] In summary, the stud bolt 14 and nut 15 limit the maximum vertical displacement of the control rod 13, preventing the internal solid block 12 from colliding with the external base 16 when the control rod 13 drives the internal solid block 12 to move vertically. The limit rod 8 and limit bolt 9 limit the maximum horizontal displacement of the control rod 13, preventing the internal solid block 12 from colliding with the external base 16 when the control rod 13 drives the internal solid block 12 to move horizontally. This affects the stability of the overall structure during vibration characteristic experimental testing.

[0044] The motor excitation system is connected to one or both ends of the control rod 13. In principle, the excitation can be performed at one or both ends of the control rod 13. The present invention selects symmetrical placement at both ends of the control rod 13, considering the stability of the operation process.

[0045] The changes in the overall structural vibration characteristics of the one-dimensional finite period solid-liquid structure 17 when it is affected by the horizontal sway effect are tested. The specific steps are as follows: Set the excitation direction of the exciter and fix it on the experimental table. According to the setting of the exciter, place the one-dimensional finite period solid-liquid structure 17 to be tested at a reasonable position; Reference Figure 3 , the experimental bench system and connecting rod system disclosed in the present invention, place the experimental bench frame 1 at appropriate positions on both sides of the structure to be tested and fix them; Reference Figure 7 and Figure 8 , determining the initial position of the inner solid block 12 in the outer matrix 16; Reference Figure 3 and Figure 5, connect the lower end of the connecting rod 11 to the internal solid block 12 of the unit cell accordingly, and determine the position of the connecting rod 11 at this time; Connect the control rod 13 to the connecting rod 11 through the hollow rivet 10 and determine the position of the control rod 13 at this time; Install stud bolts 14 and nuts 15 to limit the vertical movement of the control rod 13; based on the obtained maximum relative displacement parameter d between the internal solid block 12 and the external matrix 16 of the structure, install limit bolts 9 and limit rods 8 on the test bench 1 to limit the maximum horizontal displacement of the control rod 13, so that the maximum horizontal displacement of the control rod 13 does not exceed d; Reference Figure 4 and Figure 6 , match the motion platform 3 with the guide rail 2, and connect one end of the transmission rod 6 to the motion platform 3; install the transmission pulley 5 on the motor 4, and connect the transmission pulley 5 to the other end of the transmission rod 6 to complete the installation of the motor excitation system; Reference Figure 1 , connect the motor excitation system to the control rod 13 through the connecting bolt 7; Further, according to the test requirements, the excitation frequency of the motor 4 is set, the motor 4 is started, and the motor excitation system is observed to see whether it operates stably; When the motor excitation system is running smoothly, the sensor is placed at a reasonable position on the one-dimensional finite period solid-liquid structure 17 to be measured, the exciter is started, the response signal is received through the sensor, and the data is processed to obtain the dynamic response characteristics of the structure when subjected to the horizontal shaking effect; the test is repeated to obtain multiple sets of data and post-process them to obtain the experimental results.

[0046] The changes in the overall structural vibration characteristics of the one-dimensional finite period solid-liquid structure 17 when it is affected by the vertical sloshing effect are tested. The specific steps are as follows: Set the excitation direction of the exciter and fix it on the experimental table. According to the setting of the exciter, place the one-dimensional finite period solid-liquid structure 17 to be tested at a reasonable position; Reference Figure 3 , the experimental bench system and connecting rod system disclosed in the present invention, place the experimental bench frame 1 at appropriate positions on both sides of the structure to be tested and fix them; Reference Figure 7 and Figure 8 , determining the initial position of the inner solid block 12 in the outer matrix 16; Reference Figure 3 and Figure 5 , connect the lower end of the connecting rod 11 to the internal solid block 12 of the unit cell accordingly, and determine the position of the connecting rod 11 at this time; Connect the control rod 13 to the connecting rod 11 through the hollow rivet 10 and determine the position of the control rod 13 at this time; Determine the height of the control rod 13. The distance between the stud bolts 14 at the upper and lower ends of the control rod 13 is the diameter of the control rod 13 plus the maximum relative displacement of the internal solid block 12 relative to the external base 16. The stud bolts 14 are fixed with nuts 15. After determining the horizontal position of the control rod 13, install the limit bolt 9 and the limit rod 8 to limit the control rod 13 in the horizontal direction; Install connecting bolts 7 in the holes at both ends of the control rod 13, install the moving platform 3 and the guide rail 2, the moving platform 3 and the guide rail 2 are perpendicular to the control rod 13, one end of the transmission rod 6 is connected to the moving platform 3, and the other end is connected to the transmission pulley 5, and the transmission pulley 5 is installed on the transmission shaft of the motor 4.

[0047] The excitation frequency of motor 4 is set and motor 4 is started. When the motor excitation system runs smoothly, it is observed that while the external base 16 remains partially stationary, the internal solid block 12 reciprocates at a specified frequency in the vertical direction. The exciter is turned on and the response signal is received through the sensor. The data is processed to obtain the dynamic response characteristics of the structure when subjected to the vertical shaking effect.

[0048] Repeat the test to obtain multiple sets of data and perform post-processing to obtain experimental results.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A device for controlling the internal block sway in the dynamic response test of solid-liquid periodic structure, characterized in that: It includes an experimental bench (1), a motor excitation system and a connecting rod system; The experimental bench (1) includes two brackets perpendicular to the ground, with vertical slots opened in the brackets; The connecting rod system includes a control rod (13) and a plurality of connecting rods (11), wherein the control rod (13) is installed in a vertical slot and is in a suspended state; the upper end of the connecting rod (11) is connected to the control rod (13), and the lower end is connected to an internal solid block (12) in the structure to be tested; A vertical limiting structure is installed in the vertical slot to limit the degree of freedom of the control rod (13) in the vertical direction; A horizontal limiting structure is installed at the end of the control rod (13) for limiting the degree of freedom of the control rod (13) in the horizontal direction; The motor excitation system is connected to the control rod (13) and is used to drive the control rod (13) to perform reciprocating translational motion in the vertical or horizontal direction, and transmit the excitation signal to the connecting rod (11). The connecting rod (11) drives the internal solid block (12) to perform reciprocating translational motion at a specified frequency.

2. The device for controlling the internal block sway in the dynamic response test of a solid-liquid periodic structure according to claim 1, characterized in that: The motor excitation system includes a motor (4), a transmission pulley (5), a transmission rod (6), a guide rail (2) and a motion platform (3); The transmission pulley (5) is connected to the output shaft of the motor (4); one end of the transmission rod (6) is fixed to the transmission pulley (5) and the other end is fixed to the motion platform (3); the motion platform (3) is fixedly connected to the end of the control rod (13) and is capable of sliding on the guide rail (2); When the motor (4) drives the moving platform (3) to slide, it drives the control rod (13) to move.

3. The device for controlling the internal block sway in the dynamic response test of a solid-liquid periodic structure according to claim 2, characterized in that: The motion platform (3) is fixedly connected to the end of the control rod (13) via a connecting bolt (7).

4. The device for controlling the internal block sway in the dynamic response test of a solid-liquid periodic structure according to claim 1, characterized in that: The motor excitation system is connected to one end or both ends of the control rod (13).

5. The device for controlling the internal block sway in the dynamic response test of a solid-liquid periodic structure according to claim 1, characterized in that: The vertical limiting structure is as follows: a set of stud bolts (14) are installed in the vertical slot of each bracket to limit the vertical position of the control rod (13); The horizontal limiting structure comprises an inner limiting rod (8) and an outer limiting rod (8), wherein the inner limiting rod (8) is located on the inner side of the experimental bench (1), and the outer limiting rod (8) is located on the outer side of the experimental bench (1), and is used to limit the horizontal direction of the control rod (13).

6. The device for controlling the internal block sway in the dynamic response test of a solid-liquid periodic structure according to claim 5, characterized in that: The limiting rod (8) is fixed to the rod body of the control rod (13) via a limiting bolt (9).

7. The device for controlling the internal block sway in the dynamic response test of a solid-liquid periodic structure according to claim 5, characterized in that: The control rod (13) is connected to the connecting rod (11) via a hollow rivet (10).

8. The device for controlling the internal block sway in the dynamic response test of a solid-liquid periodic structure according to claim 1, characterized in that: When the control rod (13) is subjected to a horizontal reciprocating motion at a specified frequency, stud bolts (14) are respectively placed on the upper and lower sides of the control rod (13) at a distance equal to the diameter of the control rod (13) and are fixed by nuts (15) to limit the vertical displacement of the control rod (13); The distance between the two limit rods (8) mounted on the control rod (13) is d, and the control rod (13) moves between the limit rods (8) in a horizontal direction, and the maximum displacement does not exceed the distance d.

9. The device for controlling the internal block sway in the dynamic response test of a solid-liquid periodic structure according to claim 1, characterized in that: When a reciprocating motion of a specified frequency is applied to the control rod (13) in the vertical direction, stud bolts (14) are respectively placed on the upper and lower sides of the control rod (13). The distance between the two stud bolts (14) is the diameter of the control rod (13) plus the maximum vertical displacement d of the internal solid block (12) relative to the external base (16), and they are fixed by nuts (15).

10. A method for testing a device capable of regulating internal block sway in a dynamic response test of a solid-liquid periodic structure according to any one of claims 1 to 9, characterized in that: The types of sloshing effects on solid-liquid periodic structures are divided into two types: horizontal sloshing and vertical sloshing. When the test requirement requires determining that the type of sloshing effect on the solid-liquid periodic structure is horizontal sloshing, the specific steps include: According to the size parameters of the structure to be tested, the position of the test bench (1) is determined and fixed, the position of the exciter is determined and fixed, the position of the structure to be tested is determined and the corresponding boundary condition constraints are performed, and the sensor is attached to the corresponding position of the structure to be tested, the height of the control rod (13) is determined and constrained by the vertical limit structure, the horizontal limit structure is installed after the horizontal position of the control rod (13) is determined, the control rod (13) is connected to the solid block (12) inside the structure to be tested by the connecting rod (11), and the motor excitation system is installed at the end of the control rod (13); When the motor excitation system is running smoothly, it is observed that the internal solid block (12) performs a reciprocating motion at a specified frequency in the horizontal direction while the external base (16) remains stationary, the exciter is turned on, the response signal is received through the sensor, and the data is processed to obtain the dynamic response characteristics of the structure under test when subjected to the horizontal shaking effect; When the test requirement requires determining that the type of sloshing effect on the solid-liquid periodic structure is vertical sloshing, the specific steps include: According to the size parameters of the structure to be tested, the position of the test bench (1) is determined and fixed, the position of the exciter is determined and fixed, the position of the structure to be tested is determined and the corresponding boundary condition constraints are performed, and the sensor is attached to the corresponding position of the structure to be tested, and the height of the control rod (13) is determined. The distance between the vertical limit structures at the upper and lower ends of the control rod (13) is the diameter of the control rod (13) plus the maximum relative displacement of the internal solid block (12) relative to the external base (16); After determining the horizontal position of the control rod (13), a horizontal limit structure is installed to constrain the horizontal direction; Connecting a control rod (13) to a solid block (12) inside the structure to be measured via a connecting rod (11), and installing a motor excitation system at the end of the control rod (13); When the motor excitation system is running smoothly, it is observed that the internal solid block (12) performs reciprocating motion at a specified frequency in the vertical direction while the external matrix (16) remains stationary. The exciter is turned on, and the response signal is received through the sensor. The data is processed to obtain the dynamic response characteristics of the structure under test when it is subjected to the vertical shaking effect.

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