A dual-performance gas spring integrating stiffness and damping and a nonlinear vibration suppression method

Abstract

This invention discloses a dual-performance gas spring integrating stiffness and damping, and a nonlinear vibration suppression method, relating to the field of vibration control. The invention includes a cylinder containing a gas spring piston. One side of the gas spring piston forms a closed cavity, and the other side forms a semi-closed cavity. A damping piston is connected to the distal end of the semi-closed cavity, forming an annular airflow channel with the inner wall of the cylinder. The gas spring piston is connected to a piston rod, which extends through the damping piston to the outside of the cylinder. When the gas spring piston moves, compressing or expanding the gas in the semi-closed cavity, the gas flows within the annular airflow channel, providing energy dissipation capacity for the dual-performance gas spring. This invention forms a novel dual-performance gas spring tuned mass damper, replacing the two components of a traditional damper—the gas spring and the damping device—with a single element, simplifying the damper's structure and solving the problems of complex structure and short service life in traditional gas spring dampers.

Description

Technical Field

[0001] This invention relates to the field of vibration control, and in particular to a dual-performance gas spring integrating stiffness and damping and a nonlinear vibration suppression method. Background Technology

[0002] Tuned mass dampers, as a mature quantitative design method, are widely used in practical engineering structural vibration reduction. Gas springs, as components providing a nonlinear mechanism, have broad application prospects in structural vibration reduction. They are sealed containers filled with compressed gas, primarily relying on nonlinear restoring forces to achieve their elastic effect. Furthermore, the design of gas springs must also consider damping requirements. Damping is generally added to gas springs in two ways: one is through external devices, adding damping materials around the gas spring, such as liquid dampers or hydraulic cylinders, to control its vibration and movement; the other is by changing the shape, size, material, and gas pressure of the gas spring, which alters its damping characteristics. However, adding external devices leads to complex damper structures, high maintenance costs, and poor reliability, which is detrimental to long-term use. On the other hand, changing the shape and size of the gas spring provides relatively small damping and has many limitations, making it impossible to simultaneously meet the requirements for stiffness and damping.

[0003] For example, CN113006305A discloses an additional damping nonlinear gas spring, including a gas spring cavity and a damping cavity. A piston and a piston rod are respectively installed in the gas spring cavity and the damping cavity, and the piston rod is connected to a damping sliding mass block. This gas spring is constructed as a concentric cylinder, with the inner cavity providing stiffness and the outer cavity providing damping. The interior is filled with an oily medium, making it a traditional viscous damper. CN106704439A discloses a mass-tuned damper based on a symmetrical combined air spring, including an air spring I, a mass block, a piston, an air spring II, a cylinder, and an additional chamber. The gas spring is a cavity connected to the additional air chamber, which provides the damping function, using air damping force.

[0004] Therefore, existing gas springs with added damping still have problems such as relatively complex structure and being affected by space limitations. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a dual-performance gas spring integrating stiffness and damping, and a nonlinear vibration suppression method. On the one hand, the stiffness of the system can be adjusted by changing the air pressure inside the gas spring cavity as needed. On the other hand, the damping of the system can be changed by changing the diameter of the damping piston, thereby achieving adjustable system stiffness and damping of the damper. A novel dual-performance gas spring tuned mass damper is formed, replacing the two components of the gas spring and damping device in the traditional damper with a single component, simplifying the damper in terms of structure and solving the problems of complex structure and short service life of traditional gas spring dampers.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a dual-performance gas spring integrating stiffness and damping, comprising a cylinder body, wherein a gas spring piston is disposed within the cylinder body, a closed cavity is formed on one side of the gas spring piston, and a semi-closed cavity is formed on the other side; a damping piston is connected to the distal end of the semi-closed cavity, and the damping piston and the inner wall of the cylinder body form an annular airflow channel; the gas spring piston is connected to a piston rod, which extends through the damping piston to the outside of the cylinder body; when the gas spring piston moves to compress or expand the gas in the semi-closed cavity, the gas flows within the annular airflow channel to provide energy dissipation capability for the dual-performance gas spring.

[0008] As a further implementation, the cylinder block is formed by splicing a first cylinder block and a second cylinder block.

[0009] As a further implementation, a support member is installed at the far end of the semi-enclosed cavity, and the damping piston is attached to and fixed to the support member.

[0010] As a further implementation, a sliding device is installed between the piston rod and the support member.

[0011] As a further implementation, the closed end of the cylinder is provided with an inlet / exhaust port, which is in a closed state when the dual-performance gas spring is in motion.

[0012] Secondly, embodiments of the present invention also provide a nonlinear vibration suppression method for a dual-performance gas spring that integrates stiffness and damping, wherein a tuned mass damper is fixed to the top of the controlled structure, the tuned mass damper includes a mass block, and the two ends of the mass block are respectively connected to the dual-performance gas spring.

[0013] The tuning function of the tuned mass damper transfers the vibration energy of the controlled structure to the mass block. The reverse motion of the mass block applies a reverse force to the structure, and the damping function of the dual-performance gas spring effectively dissipates the vibration energy of the damper system, thereby reducing the vibration response of the structure.

[0014] As a further implementation, when the main structure vibrates, the damper transfers the vibration energy of the main structure to the mass block through tuning. The mass block slides in the horizontal direction, while the piston rod and the gas spring piston move together with the mass block.

[0015] When the gas spring piston moves, it compresses the gas in the closed cavity. The compressed gas hinders the movement of the gas spring piston and provides a restoring force to the gas spring piston or the mass block.

[0016] The gas spring piston pushes the air to flow in the semi-enclosed cavity. When the air is discharged to the outside through the annular airflow channel, the annular airflow channel generates resistance. The damper relies on the damping effect to quickly dissipate the absorbed vibration energy, thereby reducing the vibration response of the structure.

[0017] As a further implementation, the mass block is connected to the piston rod of the dual-performance gas spring via a universal joint, so that the piston rod can move horizontally along the axis.

[0018] As a further implementation, the mass block is mounted on the upper side of the base plate via multiple sliding wheels, and the dual-performance gas spring is installed horizontally on the support platform, which is fixedly connected to the base plate.

[0019] As a further implementation, the inlet / outlet is connected to the line air pipe via an air pipe connector.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) The gas spring of the present invention is divided into a closed cavity and a semi-closed cavity. The closed cavity provides the main stiffness of the system, and the semi-closed cavity provides a small part of the stiffness and damping of the system. The two do not interfere with each other. A damping piston is installed in the semi-closed cavity. An annular airflow channel is formed between the damping piston and the inner wall of the cylinder. When the piston moves to squeeze or expand the gas in the semi-closed cavity, the gas flows in the airflow channel. Since the annular airflow channel is small, a large amount of gas will generate resistance when it flows through, which can provide energy dissipation capacity for the dual-performance gas spring element.

[0022] (2) The dual-performance gas spring of the present invention can realize the adjustable function of system stiffness and damping by adjusting the air pressure and replacing the damping piston. It can accurately adjust the damper parameters according to the natural frequency of the structure, adapt to the natural frequency changes of the structure at different times, and improve the vibration control effect of the device. The present invention uses air as the damping source and also has excellent nonlinear stiffness characteristics. It has the advantages of simple structure, adjustable working length, low working noise, and long working life.

[0023] (3) The present invention uses one component to replace the two components of steel spring and viscous damper in the traditional damper, which simplifies the traditional damper in terms of structure and eliminates technical problems such as oil leakage; it can be applied to tall, complex building structures with high safety requirements. The damper is small in size, which weakens the problem of space limitation, and is easy and quick to install. It can be quickly debugged on site and can ensure that the main structure meets the required safety and durability under wind load and seismic action.

[0024] (4) The damper of the present invention is fixed to the top of the controlled structure by clamps, etc., to prevent damage to the original structure. When the controlled structure vibrates under the excitation of earthquake, wind, etc., the damper transfers the vibration energy of the structure to the damper based on the tuning function. The mass block slides left and right to drive the piston to move continuously. Then, the vibration energy is dissipated by the damping function of the dual-performance gas spring element, so as to realize the vibration control of the structure. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the overall structure of the dual-performance gas spring according to one or more embodiments of the present invention;

[0027] Figure 2 This is a side view of a dual-performance gas spring according to one or more embodiments of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a tuned mass damper according to one or more embodiments of the present invention.

[0029] Among them, 1. Dual-performance gas spring; 1-1. Enclosed cavity; 1-2. Inlet / exhaust port; 1-3. Gas spring piston; 1-4. Piston rod; 1-5. Semi-enclosed cavity; 1-6. Damping piston; 1-7. Bolt; 1-8. Annular airflow channel; 1-9. Sliding device; 1-10a. First cylinder; 1-10b. Second cylinder; 1-11. Supporting component; 2-1. Mass block; 2-2. Sliding wheel; 2-3. Universal shaft; 2-4. Supporting platform; 2-5. Air pipe connector; 2-6. Bolt; 2-7. Base plate. Detailed Implementation

[0030] Example 1:

[0031] In a typical embodiment of the present invention, such as Figure 1 and Figure 2 As shown, a dual-performance gas spring integrating stiffness and damping is presented.

[0032] The following is a detailed description of the dual-performance gas spring that integrates stiffness and damping, with reference to the accompanying drawings.

[0033] like Figure 1 As shown, the dual-performance gas spring of this embodiment includes a first cylinder 1-10a and a second cylinder 1-10b. The first cylinder 1-10a and the second cylinder 1-10b are snapped together to form a complete cylinder structure. One end of the first cylinder 1-10a is a closed end and the other end is an open end. The closed end of the first cylinder 1-10a is provided with an intake / exhaust port 1-2, and the open end forms an L-shaped splice seam with the proximal end of the second cylinder 1-10b.

[0034] When the damper is operating normally, the inlet / outlet ports 1-2 are closed to ensure that the cavity is sealed. When it is necessary to adjust the stiffness of the gas spring according to the natural frequency of the main structure, some air is added or released through the inlet / outlet ports 1-2 to achieve the purpose of adjusting the stiffness of the gas spring.

[0035] like Figure 2 As shown, a support member 1-11 is installed at the distal end of the second cylinder 1-10b. A damping piston 1-6 is fixed to the inner side of the support member 1-11 by bolts 1-7. The damping piston 1-6 has a cylindrical structure and fits snugly against the support member 1-11. A small airflow channel, namely an annular airflow channel 1-8, is left between the damping piston 1-6 and the inner wall of the second cylinder 1-10b. The annular airflow channel 1-8 generates resistance related to the flow velocity, dissipates energy, and further provides damping and energy dissipation capabilities for the dual-performance gas spring element.

[0036] Specifically, the outer diameter of the damping piston 1-6 is smaller than the inner diameter of the second cylinder 1-10b, leaving a small gap between the cylinder and the damping piston 1-6 (the size of the gap is determined according to the actual needs and the air damping calculation formula) to form an annular airflow channel 1-8. The semi-enclosed cavity 1-5 is connected to the outside through the annular airflow channel 1-8. When the gas spring piston 1-3 moves to compress or expand the gas in the semi-enclosed cavity, the gas flows in the annular airflow channel 1-8. Since the annular airflow channel 1-8 is small, a large amount of gas will generate resistance when it flows through, which can provide energy dissipation capacity for the dual-performance gas spring element. By adjusting the size of the annular airflow channel 1-8, that is, by replacing the damping piston 1-6 with a different diameter, the damping of the dual-performance gas spring element can be adjusted.

[0037] In order to make the area of ​​the support member 1-11 small so that the obstruction to airflow can be ignored, the support member 1-11 in this embodiment adopts a cross-shaped structure. When the gas in the semi-enclosed cavity 1-5 is compressed or expanded, it can exchange gas smoothly with the outside through the airflow channel 1-8.

[0038] The gas spring piston 1-3 is located inside the first cylinder 1-10a and is in close contact with the inner wall of the first cylinder 1-10a. The inner wall of the cylinder and the surface of the gas spring piston 1-3 are smooth, and the close contact results in a low coefficient of friction and good airtightness. A closed cavity 1-1 is formed between the gas spring piston 1-3 and the closed end of the first cylinder 1-10a, and a semi-closed cavity 1-5 is formed between the gas spring piston 1-3 and the distal support member 1-11 of the second cylinder 1-10b. The semi-closed cavity 1-5 is connected to the outside.

[0039] The gas spring piston 1-3 is connected to the piston rod 1-4. The piston rod 1-4 passes through the damping piston 1-6 and the support member 1-11 in sequence, and extends to a certain length outside the semi-enclosed cavity 1-5. The piston rod 1-4 and the support member 1-11 are connected by a sliding device 1-9, so that the piston rod 1-4 can drive the gas spring piston 1-3 to slide smoothly along the cylinder.

[0040] The sliding device 1-9 includes a semi-enclosed circular cavity track with steel balls inside. The piston rod 1-4 is in direct contact with the steel balls and can slide freely with low friction. The inner diameter of the track is slightly larger than the outer diameter of the piston rod 1-4 to ensure smooth sliding of the piston rod 1-4 and reduce friction. When the piston rod 1-4 passes through the sliding device 1-9, it can slide longitudinally along the cylinder 1-10b.

[0041] The gas spring in this embodiment is divided into a closed cavity 1-1 and a semi-closed cavity 1-5. The closed cavity 1-1 provides the main stiffness of the system, while the semi-closed cavity 1-5 provides a small part of the stiffness and damping of the system. The two do not interfere with each other.

[0042] This embodiment uses air as the damping source and also has excellent nonlinear stiffness characteristics. It has advantages such as simple construction, adjustable working length, low operating noise, and long service life. The dual-performance gas spring in this embodiment can achieve adjustable system stiffness and damping by adjusting air pressure and replacing the damping piston. It can accurately adjust the damper parameters according to the structure's natural frequency, adapt to the structure's own frequency changes at different times, and improve the vibration control effect of the device.

[0043] Example 2:

[0044] This embodiment provides a nonlinear vibration suppression method using a dual-performance gas spring that integrates stiffness and damping, employing methods such as... Figure 3 The tuned mass damper shown includes a dual-performance gas spring 1 and a mass block 2-1. The bottom of the mass block 2-1 is equipped with a sliding wheel 2-2, which is mounted on the base plate 2-7. Four sliding wheels 2-2 can be provided. Each end of the mass block 2-1 is connected to a dual-performance gas spring 1 via a universal joint 2-3, and each dual-performance gas spring 1 is fixed on the support platform 2-4.

[0045] In this embodiment, the base plate 2-7 is composed of a flat steel plate, and the support platform 2-4 is fixed to the base plate 2-7 by welding or other means; the support platform 2-4 is composed of upper and lower parts, and the dual-performance gas spring 1 is fixed to the support platform 2-4 by bolts 2-6 to restrict the movement and rotation of the dual-performance gas spring 1.

[0046] Mass block 2-1 is connected to piston rod 1-4 via universal joint 2-3. The sliding direction of mass block 2-1 is consistent with the movement direction of gas spring piston 1-3. Universal joint 2-3 ensures the horizontal axial movement of piston rod 1-4 and prevents the eccentric movement of mass block 2-1 from causing eccentric force on piston rod 1-4 and damaging the gas spring.

[0047] The inlet / outlet ports 1-2 are connected to the air pipe connectors 2-5 to ensure that the dual-performance gas spring 1 can be easily connected to the air pipe in the circuit.

[0048] The working principle of this embodiment is as follows:

[0049] The tuned mass damper is fixed to the top of the controlled structure by clamps, etc. Based on the tuning function of the damper, the vibration energy of the controlled structure is transferred to the mass block 2-1. The reverse motion of the mass block 2-1 applies a reverse force to the structure, and the damping function of the dual-performance gas spring 1 effectively dissipates the vibration energy of the damper system, thereby reducing the vibration response of the structure.

[0050] The dual-performance gas spring 1 in this embodiment provides the necessary system stiffness and damping for the damper, realizing the replacement of the two components in the traditional damper, namely the steel spring and the viscous damper, with a single component. This simplifies the construction of the damper and provides a green and low-carbon source of damping.

[0051] The device can control the air pressure inside the closed cavity 1-1 according to the natural vibration characteristics of the main structure, and provide the damper frequency adjustment function; secondly, according to the actual vibration reduction requirements of the damper, the system damping adjustment function of the damper can be realized by replacing the damping piston 1-6.

[0052] This nonlinear vibration suppression method specifically includes:

[0053] The tuned mass damper is fixed to the top of a high-rise building or tall structure. Under earthquake or wind load, the top of the main structure will generate a large horizontal vibration. When the main structure vibrates, the damper transfers the vibration energy of the main structure to the mass block 2-1 through the tuning effect. The mass block 2-1 slides along the base plate 2-7. At this time, the piston rod 1-4 and the gas spring piston 1-3 move together with the mass block 2-1.

[0054] When the gas spring piston 1-3 moves, it compresses the gas inside the closed cavity 1-1. The compressed gas hinders the movement of the gas spring piston 1-3 and provides a restoring force to the gas spring piston 1-3 or the mass block 2-1. At this time, the stiffness of the dual-performance gas spring 1 exhibits nonlinear characteristics. The gas spring piston 1-3 pushes the air to flow in the semi-closed cavity 1-5. When the air is discharged to the outside through the annular airflow channel 1-8, the narrow airflow channel hinders the gas flow, thus generating resistance. As the piston's movement speed or the gas flow speed gradually increases, the air resistance also increases. The damper relies on the damping effect of the system to quickly dissipate the absorbed vibration energy, thereby effectively reducing the vibration response of the structure.

[0055] This embodiment is applicable to tall, complex building structures with high safety requirements. The damper is small in size, which reduces the problem of space limitation. It is easy and quick to install and can be quickly debugged on site. It can ensure that the main structure meets the required safety and durability under wind load and seismic action, realizing a device for controlling structural vibration under multiple disasters.

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual performance gas spring integrating stiffness and damping, characterized in that, The double performance gas spring comprises a cylinder, a gas spring piston arranged in the cylinder, a closed cavity formed on one side of the gas spring piston, a semi-closed cavity formed on the other side of the gas spring piston, a damping piston connected to the distal end of the semi-closed cavity, an annular gas flow channel formed between the damping piston and the inner wall of the cylinder, a piston rod connected to the gas spring piston, and the piston rod extending to the outside of the cylinder through the damping piston. A support member is arranged at the distal end of the semi-closed cavity, and the damping piston is attached to and fixed to the support member. The closed end of the cylinder is provided with an air inlet / outlet port.

2. The dual performance gas spring with stiffness and damping integrated according to claim 1, characterized in that, The cylinder is formed by splicing a first cylinder and a second cylinder.

3. The stiffness and damping integrated dual performance gas spring of claim 1, wherein, A sliding device is arranged between the piston rod and the support member.

4. A method for nonlinear vibration suppression of a stiffness-damping integrated dual performance gas spring, characterized in that, The tuned mass damper is fixed to the top of the controlled structure, and the tuned mass damper comprises a mass block, and the mass block is connected to the double performance gas spring as claimed in any one of claims 1-3 at both ends. The vibration energy of the controlled structure is transferred to the mass block based on the tuning function of the tuned mass damper, the reverse force is applied to the structure through the reverse movement of the mass block, and the vibration energy of the damper system is effectively dissipated by the damping function of the double performance gas spring, thereby reducing the vibration response of the structure.

5. The stiffness and damping integrated dual performance gas spring nonlinear vibration suppression method according to claim 4, characterized in that, When the main structure vibrates, the damper transfers the vibration energy of the main structure to the mass block through tuning, and the mass block slides in the horizontal direction, and the piston rod and the gas spring piston move together with the mass block. The gas spring piston extrudes the gas in the closed cavity during movement, and the compressed gas hinders the movement of the gas spring piston and provides a restoring force to the gas spring piston or the mass block. The gas spring piston pushes the air in the semi-closed cavity to flow, and when the air is discharged to the outside through the annular gas flow channel, the annular gas flow channel generates resistance, and the damper quickly dissipates the absorbed vibration energy through damping to reduce the vibration response of the structure.

6. The stiffness and damping integrated dual performance gas spring nonlinear vibration suppression method according to claim 4, wherein, The mass block and the piston rod of the double performance gas spring are connected through a universal shaft to enable the piston rod to move in the horizontal axial direction.

7. The stiffness and damping integrated dual performance gas spring nonlinear vibration suppression method according to claim 6, characterized in that, The mass block is arranged on the upper side of the bottom plate through a plurality of sliding wheels, and the double performance gas spring is arranged in a horizontal state on a support platform, and the support platform is fixedly connected to the bottom plate.

8. The stiffness and damping integrated dual performance gas spring nonlinear vibration suppression method according to claim 4, wherein, The air inlet / outlet port is connected to the line air pipe through the air pipe joint.

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