An adaptive fluid inertia container suitable for vibration reduction and isolation of building structures

Abstract

The present invention proposes an adaptive fluid inertia device suitable for vibration reduction and isolation of building structures, belonging to the field of vibration reduction and isolation technology. The device includes: a first hydraulic cylinder, a second hydraulic cylinder, a third hydraulic cylinder, a piston, a first piston rod, a second piston rod, a first cover plate, a second cover plate, a first oil inlet piston, and a second oil inlet piston; through the combination of hydraulic cylinders and pistons, the apparent mass is amplified and the output is dynamically adjusted, effectively widening the vibration reduction frequency band and improving the dissipation effect of vibration energy. Its core technical point is that the nonlinear vibration control of the inertia container does not rely on the geometric structure, and its apparent mass can change in real time according to the displacement of the structure to adapt to different vibration amplitudes. It has a simple structure and is easy to install.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration reduction and isolation, and in particular relates to an adaptive fluid inertia container suitable for vibration reduction and isolation of building structures. Background Art

[0002] Compared to traditional mass elements, inertia elements achieve greater inertia without requiring significant physical mass. This overcomes the limitations of traditional mass elements in practical installation and the additional vibration they introduce to the structure due to their large physical mass. Furthermore, using inertia elements in conjunction with damping elements can effectively increase the damping element's energy efficiency, enabling effective control of the structure's dynamic response. Common inertia elements include solid inertia elements and fluid inertia elements. Fluid inertia elements utilize the movement of a piston to accelerate the flow of fluid from a cylinder to a spiral conduit, thereby achieving mass amplification. Furthermore, the viscous damping generated by the fluid flow in the fluid inertia element itself dissipates energy.

[0003] However, when the external excitation frequency falls outside the linear inertial system's vibration damping frequency band, the system may lose its damping effect or even experience an amplification effect. Compared to linear vibration control, nonlinear vibration control offers a wider effective damping frequency band and improved robustness, resulting in greater adaptability and vibration damping and isolation. Current research on nonlinear vibration control using nonlinear masses primarily involves attaching linear solid inertial vessels to nonlinear structural systems. This indirect implementation is highly complex. Summary of the Invention

[0004] To address the challenges of existing technologies, this invention proposes an adaptive fluid inertia chamber for vibration reduction and isolation in building structures. This chamber, which does not rely on geometric structure to achieve nonlinear vibration control, features a simple construction and is easy to install. When the structure is subjected to low external excitation, the apparent mass of the adaptive fluid inertia chamber remains constant. When the external excitation is high and the displacement of the controlled structure exceeds a certain limit, the apparent mass of the adaptive fluid inertia chamber changes with the displacement, thereby adjusting the output in real time to achieve better vibration reduction and isolation.

[0005] The present invention provides an adaptive fluid inertia container suitable for vibration reduction and isolation of building structures. When the inertia container vibrates, its piston moves along with the displacement of the controlled structure, and the output is adjusted in real time according to the size of the structural displacement, which can effectively widen the vibration reduction frequency band and suppress structural vibration.

[0006] The technical solution adopted in the present invention is:

[0007] An adaptive fluid inertia container suitable for vibration reduction and isolation of building structures includes: a first hydraulic cylinder 1, a second hydraulic cylinder 2, a third hydraulic cylinder 3, a piston 4, a first piston rod 5, a second piston rod 6, a first cover plate 7, a second cover plate 8, a first oil inlet hole piston 9, and a second oil inlet hole piston 10.

[0008] The second hydraulic cylinder 2, the first hydraulic cylinder 1, and the third hydraulic cylinder 3 are spliced ​​together to form a connected hydraulic cylinder assembly, and the hydraulic cylinders are connected by threads; the first hydraulic cylinder 1 is in the middle, the second hydraulic cylinder 2 is on the left, and the third hydraulic cylinder 3 is on the right; the inner diameters of the chambers of the second hydraulic cylinder 2 and the third hydraulic cylinder 3 are equal and smaller than the inner diameter of the chamber of the first hydraulic cylinder 1;

[0009] The piston 4 is placed in the hydraulic cylinder assembly; the outer diameter of the piston 4 is equal to the inner diameter of the chamber of the second hydraulic cylinder 2, or the outer diameter of the piston 4 is equal to the inner diameter of the chamber of the third hydraulic cylinder 3; the length of the piston 4 is greater than the length of the chamber of the first hydraulic cylinder 1, so as to ensure that the piston 4 initially overlaps with the inner chambers of the second hydraulic cylinder 2 and the inner chambers of the third hydraulic cylinder 3;

[0010] The outer side of the piston 4 is provided with a spiral groove, the inner diameter of which is much smaller than the inner diameter of the hydraulic cylinder, and can form a spiral channel with the inner wall of the second hydraulic cylinder 2 or the third hydraulic cylinder 3;

[0011] The piston 4 divides the cavity inside the hydraulic cylinder assembly into three parts: the inner chamber of the first hydraulic cylinder 1, the inner chamber of the second hydraulic cylinder 2 and the inner chamber of the third hydraulic cylinder 3;

[0012] The first cover plate 7 and the second cover plate 8 are respectively placed on both sides of the second hydraulic cylinder 2 and the third hydraulic cylinder 3 for sealing the chamber;

[0013] The first cover plate 7 and the second cover plate 8 are provided with openings, the inner diameter of the openings being equal to the outer diameter of the piston rods, and cooperating with the first piston rod 5 and the second piston rod 6 to form a seal;

[0014] The piston 4 is provided with a first piston rod 5 and a second piston rod 6 on both sides. The first piston rod 5 and the second piston rod 6 have the same diameter. The first piston rod 5 passes through the opening of the first cover plate 7, and the second piston rod 6 passes through the opening of the second cover plate 8.

[0015] The controlled structure is connected to the inertia container via the first piston rod 5 and the second piston rod 6, which drives the piston rods to vibrate back and forth. The movement direction of the inertia container is consistent with the vibration direction of the controlled structure.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The nonlinear implementation form does not depend on the geometric structure, the structure is simple, and the installation is convenient;

[0018] (2) The output of the inertia container is adaptive. When the vibration displacement of the controlled structure is small, the apparent amplified mass of the inertia container is constant. When the vibration displacement of the controlled structure exceeds a certain limit, the apparent amplified mass of the inertia container changes with the displacement.

[0019] (3) The controlled structure vibrates independently left and right (or front and back) under external excitation, and the inertia output depends only on the displacement in that direction;

[0020] (4) The structural components are easy to disassemble and can be used in combination according to specific working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a 1 / 4 cross-sectional schematic diagram of the three-dimensional structure of the adaptive fluid inertia container of the present invention;

[0022] Figure 2 This is an exploded schematic diagram of the three-dimensional structure of the adaptive fluid inertia container of the present invention;

[0023] Figure 3 This is a schematic diagram of the piston and piston rod parts of the adaptive fluid inertia container of the present invention;

[0024] Description of reference numerals:

[0025] 1-first hydraulic cylinder, 2-second hydraulic cylinder, 3-third hydraulic cylinder, 4-piston, 5-first piston rod, 6-second piston rod, 7-first cover plate, 8-second cover plate, 9-first oil inlet hole piston, 10-second oil inlet hole piston. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and implementation methods.

[0027] The present invention provides an adaptive fluid inertia container suitable for reducing and isolating vibrations of building structures, comprising: a first hydraulic cylinder 1, a second hydraulic cylinder 2, a third hydraulic cylinder 3, a piston 4, a first piston rod 5, a second piston rod 6, a first cover plate 7, a second cover plate 8, a first oil inlet hole piston 9, and a second oil inlet hole piston 10.

[0028] like Figure 1 The second hydraulic cylinder 2, the first hydraulic cylinder 1 and the third hydraulic cylinder 3 are spliced ​​together to form a connected hydraulic cylinder splicing body, and the hydraulic cylinders are connected by threads; wherein, the first hydraulic cylinder 1 is in the middle, the second hydraulic cylinder 2 is on the left, and the third hydraulic cylinder 3 is on the right; the inner diameters of the chambers of the second hydraulic cylinder 2 and the third hydraulic cylinder 3 are equal and smaller than the inner diameter of the chamber of the first hydraulic cylinder 1;

[0029] The piston 4 is placed in the hydraulic cylinder assembly; the outer diameter of the piston 4 is equal to the inner diameter of the chamber of the second hydraulic cylinder 2, or the outer diameter of the piston 4 is equal to the inner diameter of the chamber of the third hydraulic cylinder 3; the length of the piston 4 is greater than the length of the chamber of the first hydraulic cylinder 1, so as to ensure that the piston 4 initially overlaps with the inner chambers of the second hydraulic cylinder 2 and the inner chambers of the third hydraulic cylinder 3;

[0030] The outer side of the piston 4 is provided with a spiral groove, the inner diameter of which is much smaller than the inner diameter of the hydraulic cylinder, and can form a spiral channel with the inner wall of the second hydraulic cylinder 2 or the third hydraulic cylinder 3;

[0031] The piston 4 divides the cavity inside the hydraulic cylinder assembly into three parts: the inner chamber of the first hydraulic cylinder 1, the inner chamber of the second hydraulic cylinder 2 and the inner chamber of the third hydraulic cylinder 3;

[0032] The first cover plate 7 and the second cover plate 8 are respectively placed on both sides of the second hydraulic cylinder 2 and the third hydraulic cylinder 3 for sealing the chamber;

[0033] The first cover plate 7 and the second cover plate 8 are provided with openings, the inner diameter of the openings being equal to the outer diameter of the piston rods, and cooperating with the first piston rod 5 and the second piston rod 6 to form a seal;

[0034] The piston 4 is provided with a first piston rod 5 and a second piston rod 6 on both sides. The first piston rod 5 and the second piston rod 6 have the same diameter. The first piston rod 5 passes through the opening of the first cover plate 7, and the second piston rod 6 passes through the opening of the second cover plate 8.

[0035] Furthermore, the second hydraulic cylinder 2 and the third hydraulic cylinder 3 each have an oil inlet hole, and the oil inlet holes are sealed by a first oil inlet hole piston 9 and a second oil inlet hole piston 10 respectively;

[0036] The oil is poured into the oil inlet hole on one side and flows out from the other side, which proves that the oil has filled the internal chamber of the inertial container; after the oil is poured in, the first oil inlet hole piston 9 and the second oil inlet hole piston 10 are used to seal the oil inlet hole;

[0037] Furthermore, the piston 4 is joined to the first piston rod 5 and the second piston rod 6 by welding; Figure 3 ;

[0038] Furthermore, the spiral grooves of the piston 4 can be arranged at equal intervals or at unequal intervals as required.

[0039] Furthermore, the first oil inlet piston 9 and the second oil inlet piston 10 are tightly connected to the oil inlet holes via threads.

[0040] Furthermore, the first cover plate 7 and the second hydraulic cylinder 2 are connected, and the second cover plate 8 and the third hydraulic cylinder 3 are connected via threads.

[0041] Furthermore, the first hydraulic cylinder 1, the second hydraulic cylinder 2, the third hydraulic cylinder 3, and the piston 4 can be replaced with components of different sizes according to the shock absorption requirements under different earthquake fortification intensities.

[0042] The controlled structure (not shown) is connected to the inertia container via the first piston rod 5 and the second piston rod 6, driving the piston rods to vibrate back and forth. The movement direction of the inertia container is consistent with the vibration direction of the controlled structure.

[0043] Working Principle: As the inertial chamber piston 4 moves back and forth, fluid flows from one side of the cylinder to the other through the spiral conduit. When the piston rod moves left, the fluid in the second hydraulic cylinder 2 enters the first hydraulic cylinder 1 via the spiral conduit, and the fluid in the first hydraulic cylinder 1 enters the third hydraulic cylinder 3 via the spiral conduit. Overall, the volume of the second hydraulic cylinder 2 decreases while the volume of the third hydraulic cylinder 3 increases, shifting fluid from the left chamber to the right. The reverse occurs when the piston rod moves right, creating a circular flow. Because the area of ​​the chambers differs from that of the spiral conduit, and the flow rate in the piston is equal to that in the spiral conduit, the flow rate in the spiral conduit is much greater than the movement speed of the piston 4, thereby amplifying inertial mass. Simultaneously, the fluid generates damping forces due to pressure differences, viscosity coefficients, and other factors during flow, thereby dissipating energy.

[0044] The controlled structure drives the first and second piston rods to vibrate and generate displacement. When the displacement is less than the overlap length between the piston and the second or third hydraulic cylinder, the apparent amplified mass of the inertia container remains constant. When the rightward displacement is greater than the overlap length between the piston and the second hydraulic cylinder, or the leftward displacement is greater than the overlap length between the piston and the third hydraulic rod, the length of the spiral channel changes with the displacement, thereby changing the apparent amplified mass of the inertia container. The inertia container provides nonlinear output for the controlled structure, effectively reducing the vibration response of the controlled structure.

[0045] The present invention has good economic and social benefits, and its key technical points are as follows:

[0046] Key Technical Point 1: The piston divides the connected body composed of the first, second, and third hydraulic cylinders into three parts; initially, the piston overlaps with the second and third hydraulic cylinders, and the spiral grooves on the piston form spiral channels with the second and third hydraulic cylinders, connecting the first and second hydraulic cylinders and the first and third hydraulic cylinders, respectively;

[0047] Key Technical Point 2: The spiral grooves can be spaced at equal or unequal intervals as needed. The piston rod moves with the controlled structure. When the displacement is small, the total length of the spiral channel remains unchanged. When the displacement exceeds the overlap length, the length of the spiral channel changes with the displacement, thereby affecting the output of the inertia container.

[0048] Key technical point three: The first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder and the piston are all independent and easy to disassemble, and can be used in combination according to different working conditions.

[0049] The above description and accompanying drawings are provided for clarity only. Those skilled in the art should understand the description as a whole. The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An adaptive fluid inertia container suitable for vibration reduction and isolation of building structures, characterized in that: include: A first hydraulic cylinder (1), a second hydraulic cylinder (2), a third hydraulic cylinder (3), a piston (4), a first piston rod (5), a second piston rod (6), a first cover plate (7), a second cover plate (8), a first oil inlet hole piston (9), and a second oil inlet hole piston (10); The second hydraulic cylinder (2), the first hydraulic cylinder (1) and the third hydraulic cylinder (3) are spliced ​​to form a connected hydraulic cylinder splicing body, and the hydraulic cylinders are connected by threads; wherein the first hydraulic cylinder (1) is in the middle, the second hydraulic cylinder (2) is on the left, and the third hydraulic cylinder (3) is on the right; the inner diameters of the chambers of the second hydraulic cylinder (2) and the third hydraulic cylinder (3) are equal and smaller than the inner diameter of the chamber of the first hydraulic cylinder (1); The piston (4) is placed in the hydraulic cylinder assembly; the outer diameter of the piston (4) is equal to the inner diameter of the chamber of the second hydraulic cylinder (2), or the outer diameter of the piston (4) is equal to the inner diameter of the chamber of the third hydraulic cylinder (3); the length of the piston (4) is greater than the length of the chamber of the first hydraulic cylinder (1); The outer side of the piston (4) is provided with a spiral groove, the inner diameter of which is much smaller than the inner diameter of the hydraulic cylinder, and can form a spiral channel with the inner wall of the second hydraulic cylinder (2) or the third hydraulic cylinder (3); The first cover plate (7) and the second cover plate (8) are respectively placed on both sides of the second hydraulic cylinder (2) and the third hydraulic cylinder (3) to seal the chamber; The first cover plate (7) and the second cover plate (8) are provided with openings, and the inner diameter of the openings is equal to the outer diameter of the piston rod; The piston (4) is provided with a first piston rod (5) and a second piston rod (6) on both sides, and the first piston rod (5) and the second piston rod (6) have the same diameter; the first piston rod (5) passes through the opening of the first cover plate (7), and the second piston rod (6) passes through the opening of the second cover plate (8); The controlled structure is connected to the inertial container via a first piston rod (5) and a second piston rod (6), driving the piston rod to vibrate back and forth, and the movement direction of the inertial container is consistent with the vibration direction of the controlled structure; The second hydraulic cylinder (2) and the third hydraulic cylinder (3) each have an oil inlet hole, and the oil inlet holes are sealed by a first oil inlet hole piston (9) and a second oil inlet hole piston (10) respectively; The piston (4) is joined to the first piston rod (5) and the second piston rod (6) by welding.

2. The adaptive fluid inertia container suitable for vibration reduction and isolation of building structures according to claim 1, characterized in that: The spiral tube grooves of the piston (4) are arranged at equal or unequal intervals.

3. The adaptive fluid inertia container suitable for vibration reduction and isolation of building structures according to claim 1, characterized in that: The first oil inlet hole piston (9) and the second oil inlet hole piston (10) are tightly connected to the oil inlet hole via threads.

4. The adaptive fluid inertia container suitable for vibration reduction and isolation of building structures according to claim 1, characterized in that: The first cover plate (7) and the second hydraulic cylinder (2), and the second cover plate (8) and the third hydraulic cylinder (3) are connected via threads.

5. The adaptive fluid inertia container suitable for vibration reduction and isolation of building structures according to claim 1, characterized in that: The first hydraulic cylinder (1), the second hydraulic cylinder (2), the third hydraulic cylinder (3), and the piston (4) can be replaced with components of different sizes according to the shock absorption requirements under different earthquake fortification intensities.

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