Self-adaptive fluid inerter suitable for vibration reduction and isolation of building structure

Abstract

The invention provides a self-adaptive fluid inerter device suitable for vibration reduction and vibration isolation of a building structure, and belongs to the technical field of vibration reduction and vibration isolation. The device comprises 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 the hydraulic cylinder and the piston, amplification of apparent mass is achieved, output is dynamically adjusted, the vibration reduction frequency band is effectively widened, and the dissipation effect of vibration energy is improved. The core technical points are that nonlinear vibration control of the inerter does not depend on a geometric structure, the apparent mass of the inerter can change in real time according to the displacement of the structure, the inerter adapts to different vibration amplitudes, the structure is simple, and installation is convenient.

Description

Technical Field

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

[0002] Compared with traditional mass elements, inertia elements do not require a large physical mass to obtain a large inertia, which solves the problems that traditional mass elements have great limitations in the actual installation process due to their large physical mass and will bring additional vibration to the structure. In addition, the use of inertia elements and damping elements can effectively increase the energy consumption efficiency of damping elements and achieve effective control of the dynamic response of the structure. Common inertia vessels include solid inertia vessels and fluid inertia vessels. Among them, the fluid inertia vessel uses the movement of the piston to accelerate the flow of fluid from the cylinder to the spiral pipe, thereby achieving mass amplification. In addition, the viscous damping generated by the fluid flow of the fluid inertia vessel itself can achieve energy dissipation.

[0003] However, when the external excitation frequency is outside the vibration reduction frequency band of the linear inertial system, the system may lose its vibration reduction effect or even produce an amplification effect. Compared with linear vibration control, nonlinear vibration control has a wider effective vibration reduction frequency band and better robust performance, so it has better adaptability and vibration reduction and isolation effects. At present, the research on nonlinear vibration control using nonlinear mass is mainly based on attaching linear solid inertial vessels to nonlinear structural systems. This indirect implementation form has high structural complexity. Summary of the invention

[0004] In view of the problems of the prior art, the present invention proposes an adaptive fluid inertia container suitable for vibration reduction and isolation of building structures, which does not rely on geometric structure to achieve nonlinear vibration control, has a simple structure and is easy to install. When the external excitation of the structure is small, the apparent mass of the adaptive fluid inertia container is constant; when the external excitation is large and the displacement of the controlled structure exceeds a certain limit, the apparent mass of the adaptive fluid inertia container changes with the displacement, thereby adjusting the output in real time to achieve better vibration reduction and isolation effects.

[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 by the present invention is: An adaptive fluid inertia container suitable for vibration reduction and isolation of building structures comprises: 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.

[0007] 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 second hydraulic cylinder 2 (or the third hydraulic cylinder 3); the length of the piston 4 is greater than the length of the first hydraulic cylinder 1 chamber, so as to ensure that the piston 4 is overlapped with the inner chambers of the second hydraulic cylinder 2 and the third hydraulic cylinder 3 at the beginning; 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 piston 4 divides the cavity in 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; The first cover plate 7 and the second cover plate 8 are respectively disposed 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, the inner diameter of the openings is equal to the outer diameter of the piston rod, and can form a seal with the first piston rod 5 and the second piston rod 6; The two sides of the piston 4 are respectively provided with a first piston rod 5 and a second piston rod 6, 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 through the first piston rod 5 and the second piston rod 6, which drives the piston rod to vibrate back and forth. The movement direction of the inertial container is consistent with the vibration direction of the controlled structure.

[0008] Compared with the prior art, the present invention has the following beneficial effects: (1) The nonlinear implementation form does not depend on the geometric structure, the structure is simple, and the installation is convenient; (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. (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 this direction; (4) The structural parts are easy to disassemble and can be used in combination according to specific working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a 1 / 4 cross-sectional schematic diagram of the three-dimensional structure of the adaptive fluid inertia container of the present invention; Figure 2 It is a schematic exploded view of the three-dimensional structure of the adaptive fluid inertia container of the present invention; Figure 3 It is a schematic diagram of the piston and piston rod parts of the adaptive fluid inertia container of the present invention; Description of reference numerals: 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

[0010] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0011] The present invention provides an adaptive fluid inertia container suitable for reducing and isolating vibration 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.

[0012] like Figure 1 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 second hydraulic cylinder 2 (or the third hydraulic cylinder 3); the length of the piston 4 is greater than the length of the first hydraulic cylinder 1 chamber, so as to ensure that the piston 4 is overlapped with the inner chambers of the second hydraulic cylinder 2 and the third hydraulic cylinder 3 at the beginning; 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 piston 4 divides the cavity in 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; The first cover plate 7 and the second cover plate 8 are respectively disposed 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, the inner diameter of the openings is equal to the outer diameter of the piston rod, and can form a seal with the first piston rod 5 and the second piston rod 6; The two sides of the piston 4 are respectively provided with a first piston rod 5 and a second piston rod 6, 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; 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; 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; Furthermore, the piston 4 is combined with the first piston rod 5 and the second piston rod 6 by welding; Figure 3 ; Furthermore, the spiral grooves of the piston 4 may be arranged at equal intervals or at unequal intervals as required.

[0013] Furthermore, the first oil inlet hole piston 9 and the second oil inlet hole piston 10 are tightly connected to the oil inlet holes via threads.

[0014] Furthermore, 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.

[0015] 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.

[0016] The controlled structure (not shown in the figure) is connected to the inertial container through the first piston rod 5 and the 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.

[0017] Working principle: When the inertial container piston 4 moves back and forth, the fluid flows from one side of the hydraulic cylinder to the other side through the spiral pipe. When the piston rod moves to the left, the fluid in the inner chamber of the second hydraulic cylinder 2 enters the inner chamber of the first hydraulic cylinder 1 through the spiral pipe, and the fluid in the inner chamber of the first hydraulic cylinder 1 enters the inner chamber of the third hydraulic cylinder 3 through the spiral pipe. From the overall point of view, the volume of the chamber of the second hydraulic cylinder 2 decreases while the volume of the inner chamber of the third hydraulic cylinder 3 increases, and the fluid is transferred from the left chamber to the right chamber. When the piston rod moves to the right, the opposite is true, thereby realizing a circulating flow. Because there is an area difference between the chamber area and the spiral pipe area, and the flow rate in the piston is equal to the flow rate in the spiral pipe, the flow rate of the fluid in the spiral pipe is much greater than the movement speed of the piston 4, thereby realizing inertial mass amplification. At the same time, the fluid generates damping force due to pressure difference, viscosity coefficient, etc. during the flow process, thereby realizing energy consumption.

[0018] The controlled structure drives the first piston rod and the second piston rod to vibrate and generate displacement. When the displacement is less than the overlap length between the piston and the second hydraulic cylinder or the third hydraulic cylinder, the apparent amplified mass of the inertia container is 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 cylinder, 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.

[0019] The present invention has good economic and social benefits, and the key technical points are as follows: Key technical point 1: The piston divides the connected body composed of the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder into three parts; at the initial moment, the piston overlaps with the second hydraulic cylinder and the third hydraulic cylinder, and the spiral groove on the piston forms a spiral channel with the second hydraulic cylinder and the third hydraulic cylinder, respectively connecting the first hydraulic cylinder with the second hydraulic cylinder and the first hydraulic cylinder with the third hydraulic cylinder; Key technical point 2: The spiral grooves can be set at equal intervals or unequal intervals according to needs; 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 inertial container; 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.

[0020] The above description and drawings are described only for the sake of clarity. Those skilled in the art should understand the description as a whole. The above description is only 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 any person skilled in the art without departing from the concept and principle 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 inside 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 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) has 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.

2. According to claim 1, an adaptive fluid inertia container suitable for vibration reduction and isolation of building structures is characterized in that: 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.

3. According to claim 1, an adaptive fluid inertia container suitable for vibration reduction and isolation of building structures is characterized in that: The piston (4) is joined to the first piston rod (5) and the second piston rod (6) by welding.

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

5. The adaptive fluid inertia container suitable for vibration reduction and isolation of building structures according to claim 2, 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.

6. 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.

7. 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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