An adaptive fluid-structure interaction type inertial system

Abstract

The application relates to a self-adaptive fluid-solid coupling inertial system, which comprises a piston rod (2), a piston (3), an open-close ring (4) and a cylinder (13), the piston (3) and the open-close ring (4) are arranged on the piston rod (2), one end of the piston rod (2) extends out of the cylinder (13) and is connected with an external structure to drive the piston (3) and the open-close ring (4) to move horizontally in the cylinder (13), the piston (3) divides the cylinder (13) into two chambers, a plurality of spiral pipes are wound on the outer sidewall of the cylinder (13) in a circumferential direction, and the two ends of the spiral pipes are respectively communicated with the two chambers of the cylinder (13), and the cylinder (13) and the interiors of the spiral pipes are filled with fluid (11) and solid particles (12) mixed in the fluid (11). Compared with the prior art, the inertial behavior and the damping behavior are realized by changing the flow velocities of the fluid and the solid particles, the parameters of the inertial system can be changed according to the relative displacement of the two ends of the system, and the self-adaptability to multi-level seismic actions is realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vibration control, and relates to a self-adaptive fluid-solid coupling inertial mass system. BACKGROUND

[0002] At present, there are various implementation mechanisms that can simulate the mechanical behavior of inertial mass, such as ball screw type inertial mass, gear and rack type inertial mass, and tuned liquid type inertial mass. Among them, the main motion form conversion devices that use translation to rotation are ball screw type and gear and rack type, and existing patents related to inertial mass and inertial mass systems also mostly adopt this form. Gear and rack type inertial mass mainly realizes motion conversion through the meshing between gear and rack, and this form has a weak amplification effect on inertial mass coefficient. Although ball screw type inertial mass can achieve a more superior mass amplification effect, its mechanical structure is complex, requires high machining precision, and has high production cost. In addition, existing inertial mass elements are difficult to adapt to external excitation, that is, it is difficult to adjust the inertial mass coefficient and damping parameters according to the strength of external excitation to efficiently reduce the seismic response of the structure.

[0003] Chinese Patent CN112360914A discloses a fluid-solid coupling inertial mass container, which comprises a cylinder, a piston movably located inside the cylinder and separating the inside of the cylinder into two chambers, and a spiral pipe wrapped circumferentially on the outside wall of the cylinder, the spiral pipe being in communication with the cylinder, the cylinder and the spiral pipe being filled with fluid containing solid particles. This patent can realize the mass amplification effect (inertial mass coefficient) of the inertial mass container, and also can produce damping effect, but the performance of the inertial mass container is fixed in actual work, that is, the generated inertial mass coefficient and damping parameters are fixed values, and when the strength of external excitation changes, the parameters cannot be corrected in time to adapt to the change of excitation. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a self-adaptive fluid-solid coupling inertial mass system that is simple in form and easy to implement. The present application utilizes the change of fluid and solid particle flow rate to realize inertial mass behavior, utilizes the interaction between fluid and solid particles and the collision and friction between moving fluid and solid and pipe wall to realize damping behavior, and realizes the adaptability of the system by setting an open-close ring, and the mechanical performance parameters of the system can change with the change of relative displacement between the two ends of the system. The system has adaptability to multi-level seismic action and can realize efficient seismic mitigation of the structure.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] An adaptive fluid-structure interaction inertial-capacitive system includes a piston rod, a piston, an opening and closing ring, and a cylinder. The piston and the opening and closing ring are mounted on the piston rod and placed inside the cylinder. One end of the piston rod extends out of the cylinder and connects to an external structure. The piston rod drives the piston and the opening and closing ring to move horizontally within the cylinder. The piston divides the cylinder into two chambers. Multiple helical pipes are wound circumferentially around the outer wall of the cylinder, with both ends communicating with the two chambers of the cylinder. The cylinder and each helical pipe are filled with fluid and solid particles mixed in the fluid.

[0007] Furthermore, a spiral pipe opening is provided on the side wall of the cylinder, and the spiral pipe is connected to the inside of the cylinder through the spiral pipe opening.

[0008] Furthermore, the spiral pipe opening includes a first spiral pipe opening, a second spiral pipe opening, and a third spiral pipe opening, and the spiral pipe includes a first spiral pipe, a second spiral pipe, and a third spiral pipe.

[0009] Furthermore, the first spiral pipe, the second spiral pipe, and the third spiral pipe are respectively connected to the cylinder chamber through the first spiral pipe port, the second spiral pipe port, and the third spiral pipe port.

[0010] Furthermore, the diameter of the first spiral pipe is larger than that of the second spiral pipe, and the diameter of the second spiral pipe is larger than that of the third spiral pipe. The diameter and length should be determined according to the performance requirements of the system.

[0011] Furthermore, the inner diameter of the cylinder should be determined according to the performance requirements of the system. The opening and closing ring is a thin-walled tubular component with an outer diameter smaller than the inner diameter of the cylinder. The wall thickness should be determined according to the performance requirements of the system. The side height is greater than the sum of the diameters of the second and third spiral pipes and the distance between the openings of the second and third spiral pipes, and less than the sum of the diameters of the first and second spiral pipes and twice the distance between the openings of the first and second spiral pipes.

[0012] Furthermore, the diameter of the piston is adapted to the inner diameter of the cylinder.

[0013] Furthermore, the piston rod is connected to the external structure via an erbium ring, and the diameter of the piston rod should meet the strength requirements under the design horizontal load.

[0014] Furthermore, the spiral pipe is made of a metallic material or an organic material, wherein the metallic material includes copper or stainless steel, and the organic material includes random copolymer polypropylene (PPR) or homopolymer polypropylene (PPH). The material should have good impact resistance and strong corrosion resistance.

[0015] Furthermore, the fluid material includes water or viscous silicone oil, and the solid particles material includes copper or steel. The content of solid particles in the fluid should be determined according to the performance requirements of the system, generally 1-60%.

[0016] This invention proposes an adaptive fluid-structure interaction inertial-capacitive system. This system generates inertial-capacitive behavior by changing the flow velocity of fluid and solid particles from the cylinder to the helical pipe, and generates damping behavior through the interaction between the fluid and solid particles. Therefore, the output of this system includes both inertial-capacitive and damping components, making it an inertial-capacitive system. Furthermore, by incorporating opening and closing loops and multiple helical pipes with different geometric features, the system's performance can adapt to structural displacement; that is, the system's inertial-capacitive coefficient and damping coefficient can self-adjust according to the magnitude of the relative displacement between the two ends of the system, achieving efficient control of structural vibration.

[0017] When the piston rod moves horizontally to the left from a rest state, it forces the fluid and solid particles in the left chamber of the piston inside the cylinder into the spiral pipe, from which they flow back to the right chamber of the piston inside the cylinder. The movement of the fluid and solid particles in the spiral pipe will produce inertial capacitive behavior and damped behavior. When the piston rod moves horizontally to the right from a rest state, it forces the fluid and solid particles in the right chamber of the piston inside the cylinder into the spiral pipe, from which they flow back to the left chamber of the piston inside the cylinder.

[0018] During the horizontal reciprocating motion of the piston rod, the opening and closing ring moves along with the piston rod. When the displacement of the piston rod's reciprocating motion is small, the opening and closing ring will block the third helical conduit opening, preventing fluid and solid particles from entering the third helical conduit; that is, only the first and second helical conduits are functional. In this case, the system's capacitive and damping behaviors are weakest. When the displacement of the piston rod's reciprocating motion is moderate, the opening and closing ring will block both the second and third helical conduits, preventing fluid and solid particles from entering; that is, only the first helical conduit is functional. In this case, the system's capacitive and damping behaviors are stronger than in the first case. When the displacement of the piston rod's reciprocating motion is large, the opening and closing ring will block both the first and second helical conduits, preventing fluid and solid particles from entering; that is, only the third helical conduit is functional. In this case, the system's capacitive and damping coefficients are again stronger than in the second case. Therefore, this system can self-adjust its capacitive and damping coefficients according to the magnitude of the piston rod displacement, exhibiting self-adaptability. The specific values ​​of the inertial coefficient and damping coefficient can be adjusted by changing the type of fluid and solid particles, or by changing the design of the diameter and length of the spiral pipe. The number of spiral pipes and the position of the opening and closing rings can be adjusted according to the actual situation.

[0019] The derivation process of the inertial capacitance coefficient of the adaptive fluid-structure interaction inertial capacitance system is as follows:

[0020] Let the radius of the cylinder be R, the radius of the piston be approximately equal to the radius of the cylinder R, the radius of the piston rod be r, the radii of the first, second, and third helical pipes be r1, r2, and r3 respectively, and their lengths be l1 = l2 = l3 = l. Let the density of the fluid be ρ, and the density of the solid particles be ρ. s The content is λ. Ignoring the minute gap between the piston and the cylinder, the working area of ​​the piston is...

[0021] A = πR 2 (1)

[0022] The areas A1, A2, and A3 of the first, second, and third spiral pipes are respectively...

[0023]

[0024] Assuming the fluid and solid particles in the adaptive fluid-structure interaction inertial capacitive system have equal velocities, and the cylinder's velocity is... The piston rod moves at a speed of The velocity of the piston rod relative to the cylinder is

[0025]

[0026] When the structure of the adaptive fluid-structure interaction inertial capacitive system is subjected to frequent earthquake excitation, the reciprocating displacement of the piston rod is small, and the opening and closing ring blocks the third spiral pipe opening. At this time, the first and second spiral pipes operate normally. According to the principle of equal flow rate, the average flow velocity v of the fluid and solid in the first and second spiral pipes is [value missing]. s for

[0027]

[0028] The volume V of fluid and solid in the first and second spiral pipes s,l and V s,s They are respectively

[0029]

[0030] Then the mass m of the fluid and solid particles in the first and second helical pipes s,l and m s,s for

[0031]

[0032] The energy E of the fluid and solid particles in the first and second helical pipes s,l and E s,s They are respectively

[0033]

[0034] An ideal fluid-structure interaction inertial container can store energy of:

[0035]

[0036] Substituting equations (4) and (7) into (8), we can obtain the inertia coefficient m of the adaptive fluid-structure interaction inertia system under weak external excitation. in,s for

[0037]

[0038] When the structure of the adaptive fluid-structure interaction inertial capacitive system is subjected to seismic excitation, the piston rod of the system undergoes moderate reciprocating displacement, and the opening and closing rings block the inlets of the second and third spiral pipes. At this time, the first spiral pipe operates normally. According to the principle of equal flow rate, the average flow velocity v of the fluid and solid in the first spiral pipe is at this time. m for

[0039]

[0040] By repeating the derivation process of equations (5) and (9), the inertial capacitance coefficient m of the adaptive fluid-structure interaction inertial capacitance system under moderate external excitation can be obtained. in,m for

[0041]

[0042] When the structure of the adaptive fluid-structure interaction inertial capacitive system is subjected to rare earthquake excitation, the piston rod of the system undergoes a large reciprocating displacement, causing the opening and closing rings to block the inlets of the first and second spiral pipes. At this time, the third spiral pipe operates normally. Based on the principle of equal flow rates, the average velocity v of the fluid and solid in the third spiral pipe at this point is... r for

[0043]

[0044] By repeating the derivation process of equations (5) and (9), the inertial capacitance coefficient m of the adaptive fluid-structure interaction inertial capacitance system under strong external excitation can be obtained. in,r for

[0045]

[0046] Comparing equations (9), (11), and (13), we can see that the other parameters remain unchanged, except for A1+A2>A1>A3, hence m in,s <m in,m <m in,r By rationally designing the parameters of the spiral pipe, the system can be made adaptable to multi-level seismic forces.

[0047] Compared with the prior art, the present invention has the following advantages:

[0048] (1) The present invention generates inertial capacitive behavior by changing the flow velocity of fluid and solid particles from the cylinder to the spiral pipe;

[0049] (2) The present invention utilizes the interaction between fluid and solid particles, as well as the collision and friction between the moving fluid and solid and the pipe wall, to achieve damping behavior;

[0050] (3) By setting up opening and closing loops and multiple pipes with different geometric features, the present invention can realize the adaptive performance of the system to the structural displacement. That is, the inertial coefficient and damping coefficient of the system can be adjusted by the magnitude of the relative displacement between the two ends of the system, thereby realizing efficient control of structural vibration and adaptability to multi-level earthquake action. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the overall structure of the adaptive fluid-structure coupling inertial capacitive system in an embodiment of the present invention.

[0052] Explanation of markings in the diagram:

[0053] 1—Erbium ring, 2—Piston rod, 3—Piston, 4—Opening and closing ring, 5—First spiral pipe opening, 6—Second spiral pipe opening, 7—Third spiral pipe opening, 8—First spiral pipe, 9—Second spiral pipe, 10—Third spiral pipe, 11—Fluid, 12—Solid particle, 13—Cylinder. Detailed Implementation

[0054] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0055] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] Example:

[0058] like Figure 1 As shown, this embodiment relates to an adaptive fluid-structure interaction inertial capacitive system. The system includes a piston rod 2, a piston 3, an opening / closing ring 4, and a cylinder 13. The piston 3 and the opening / closing ring 4 are mounted on the piston rod 2 and placed inside the cylinder 13. One end of the piston rod 2 extends out of the cylinder 13 and is connected to an external structure via an erbium ring 1. The piston rod 2, equipped with the opening / closing ring 4, drives the piston 3 to move horizontally within the cylinder 13. The piston 3 divides the interior of the cylinder 13 into two chambers. A first spiral pipe 8, a second spiral pipe 9, and a third spiral pipe 10 are circumferentially wound around the outer wall of the cylinder 13 and communicate with the interior of the cylinder 13 through the first spiral pipe port 5, the second spiral pipe port 6, and the third spiral pipe port 7, respectively. The cylinder 13 and the interior of the spiral pipes are filled with fluid 11 and solid particles 12.

[0059] The first spiral pipe 8 has a diameter of 50 mm and a length of 3500 mm; the second spiral pipe 9 has a diameter of 40 mm and a length of 3500 mm; the third spiral pipe 10 has a diameter of 30 mm and a length of 3500 mm; the minimum distance between the first spiral pipe 8 and the second spiral pipe 9 is 40 mm, and the minimum distance between the second spiral pipe 9 and the third spiral pipe 10 is 60 mm; the inner radius of the cylinder 13 is 80 mm; the opening and closing ring 4 is a thin-walled tubular component with an outer radius of 79.5 mm and a side height of 160 mm; the diameter of the piston 3 is equal to the inner diameter of the cylinder 13, and the diameter of the piston rod 2 is 50 mm. The spiral pipes are made of PPR, the fluid 11 is made of water, the solid particles 12 are made of steel, and the content of solid particles 12 in the fluid 11 is 10%. The calculated inertial coefficients of the adaptive fluid-structure interaction inertial capacitive system under weak, moderate, and strong external excitations are 37 tons, 60 tons, and 168 tons, respectively.

[0060] When piston rod 2 moves horizontally to the left from a stationary state, it forces the fluid 11 and solid particles 12 from the left chamber of piston 3 inside cylinder 13 into the spiral pipe, from which they flow back to the right chamber of piston 3 inside cylinder 13. The movement of fluid 11 and solid particles 12 in the spiral pipe will produce capacitive and damped behavior. When piston rod 2 moves horizontally to the right from a stationary state, it forces the fluid 11 and solid particles 12 from the right chamber of piston 3 inside cylinder 13 into the spiral pipe, from which they flow back to the left chamber of piston 3 inside cylinder 13.

[0061] During the horizontal reciprocating motion of piston rod 2, the opening and closing ring 4 moves along with piston rod 2. When the displacement of the piston rod's reciprocating motion is small, the opening and closing ring 4 will block the third spiral pipe opening 7, preventing fluid 11 and solid particles 12 from entering the third spiral pipe 10, meaning only the first spiral pipe 8 and the second spiral pipe 9 are functional. At this time, the system's capacitive and damping behaviors will be the weakest. When the displacement of the piston rod's reciprocating motion is moderate, the opening and closing ring 4 will block the second spiral pipe opening 6 and the third spiral pipe opening 7, preventing fluid 11 and solid particles 12 from entering the second spiral pipe 9 and the third spiral pipe 10, meaning only the first spiral pipe 8 is functional. At this time, the system's capacitive and damping behaviors will be stronger than in the first case. When the displacement of the piston rod's reciprocating motion is large, the opening and closing ring 4 will block the first spiral pipe opening 5 and the second spiral pipe opening 6, preventing fluid 11 and solid particles 12 from entering the first spiral pipe 8 and the second spiral pipe 9, meaning only the third spiral pipe 10 is functional. At this time, the system's capacitive and damping coefficients will again be stronger than in the second case. Therefore, the system can automatically adjust its inertial coefficient and damping coefficient according to the magnitude of the piston rod displacement, thus exhibiting self-adaptability.

[0062] The system invented in this patent is not limited to this embodiment. The specific values ​​of the inertial coefficient and damping coefficient can be adjusted by changing the types of fluid 11 and solid particles 12, or by changing the design of the diameter and length of the spiral pipe. The number of spiral pipes and the position of the opening and closing rings 4 can be adjusted according to the actual situation.

[0063] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. An adaptive fluid-structure interaction inertial capacitive system, characterized in that, The system includes a piston rod (2), a piston (3), an opening and closing ring (4), and a cylinder (13). The piston (3) and the opening and closing ring (4) are mounted on the piston rod (2) and placed inside the cylinder (13). One end of the piston rod (2) extends out of the cylinder (13) and connects to the external structure. The piston rod (2) drives the piston (3) and the opening and closing ring (4) to move horizontally inside the cylinder (13). The piston (3) divides the inside of the cylinder (13) into two chambers. Multiple spiral pipes are wound around the outer wall of the cylinder (13) in the circumferential direction, and their two ends are connected to the two chambers of the cylinder (13) respectively. The inside of the cylinder (13) and each spiral pipe is filled with fluid (11) and solid particles (12) mixed in the fluid (11). The side wall of the cylinder (13) is provided with a spiral pipe opening, and the spiral pipe is connected to the inside of the cylinder (13) through the spiral pipe opening; The spiral pipe opening includes a first spiral pipe opening (5), a second spiral pipe opening (6) and a third spiral pipe opening (7), and the spiral pipe includes a first spiral pipe (8), a second spiral pipe (9) and a third spiral pipe (10). The first spiral pipe (8), the second spiral pipe (9) and the third spiral pipe (10) are respectively connected to the chamber of the cylinder (13) through the first spiral pipe port (5), the second spiral pipe port (6) and the third spiral pipe port (7); The diameter of the first spiral pipe (8) is larger than that of the second spiral pipe (9), and the diameter of the second spiral pipe (9) is larger than that of the third spiral pipe (10). The opening and closing ring (4) is a thin-walled tubular component with an outer diameter smaller than the inner diameter of the cylinder (13). Its side height is greater than the sum of the diameter of the second spiral pipe (9), the diameter of the third spiral pipe (10), and the distance between the second spiral pipe opening (6) and the third spiral pipe opening (7), and less than the sum of the diameter of the first spiral pipe (8), the diameter of the second spiral pipe (9), and twice the sum of the distance between the first spiral pipe opening (5) and the second spiral pipe opening (6).

2. The adaptive fluid-structure interaction inertial capacitive system according to claim 1, characterized in that, The diameter of the piston (3) is adapted to the inner diameter of the cylinder (13).

3. The adaptive fluid-structure interaction inertial capacitive system according to claim 1, characterized in that, The piston rod (2) is connected to the external structure via an erbium ring (1).

4. The adaptive fluid-structure interaction inertial capacitive system according to claim 1, characterized in that, The spiral pipe is made of metal or organic materials, wherein the metal materials include copper or stainless steel, and the organic materials include random copolymer polypropylene or homopolymer polypropylene.

5. An adaptive fluid-structure interaction inertial capacitive system according to claim 1, characterized in that, The fluid (11) is made of water or silicone oil, and the solid particles (12) are made of copper or steel. The content of solid particles (12) in the fluid (11) is 1-60%.

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