Self-resetting friction long-stroke damper of aeroelastic device and resetting method

Abstract

The invention discloses a self-resetting friction long-stroke damper of a pneumatic elastic device and a resetting method, and belongs to the technical field of civil engineering damping. The damper comprises a shell provided with a pneumatic elastic device mounting hole, an external friction plate embedding hole and a piston end opening hole, and the shell is used for mounting a pneumatic self-resetting module and a friction energy dissipation module. Comprising a friction plate, an inner friction plate and an outer friction plate, the damper piston is located in a mounting hole of the aeroelastic device, and the damper piston module is used for the pneumatic self-resetting module to do bidirectional self-resetting movement along the damper piston module. And the two piston aeroelastic devices bear high-pressure nitrogen and are used for driving the aeroelastic devices to work through compression of the high-pressure nitrogen, and the two-way self-resetting function of the damper in the pulled and pressed states is achieved through the damper piston module. The damper has low rear yield stiffness, long stroke, high energy consumption force and excellent fatigue performance, and residual deformation, top acceleration and base shear force of a structure under the action of an earthquake can be remarkably reduced.

Description

Technical Field

[0001] This invention relates to the field of seismic resistance and vibration reduction in civil engineering, and particularly to a self-resetting friction damper and reset method based on a pneumatic elastic device. Background Technology

[0002] Traditional building structures are prone to irreversible residual deformation under earthquake loads. To reduce post-earthquake repair costs and improve functional recovery capabilities, various self-resetting energy-dissipating devices have been developed in recent years. These devices, made from shape memory alloys, prestressed tendons, disc springs, or ring springs, can reduce residual displacement after an earthquake, but they also have several drawbacks.

[0003] 1. The aforementioned existing self-resetting devices all require the application of initial prestress, which is applied by on-site tensioning or torque control of bolts. The accuracy of this is difficult to guarantee, and there is a problem of prestress relaxation, making it difficult to meet the requirements of infrastructure for safe service for 50 to 100 years.

[0004] 2. The existing self-resetting devices have prominent fatigue life problems under repeated loading. Shape memory alloys and prestressed tendons are prone to material fatigue fracture after multiple weeks of cyclic loading. Disc springs and ring springs are prone to cross-sectional friction damage under cyclic loading, resulting in degradation of self-resetting performance and relaxation of preload, long-term performance decay, and decreased self-resetting ability.

[0005] 3. The existing self-resetting dampers have high post-yield stiffness, which leads to increased top-floor acceleration and base shear force, and generates large floor shear force, affecting the safety of structural and non-structural components.

[0006] 4. The existing self-resetting dampers have short strokes, which makes it difficult to meet the deformation requirements of long strokes. Summary of the Invention

[0007] To address the problems of high post-yield stiffness, complex installation, and insufficient displacement capacity in existing self-resetting damping devices, the present invention aims to provide a self-resetting friction long-stroke damper of a pneumatic elastic device and a bidirectional reset method. This device utilizes high-pressure nitrogen compression to drive the pneumatic elastic device, and achieves bidirectional self-resetting under tension and compression conditions through a damper piston module. It features low post-yield stiffness, long stroke, high energy consumption capacity, and excellent fatigue performance, significantly reducing residual deformation, top-floor acceleration, and base shear force of structures under seismic loading.

[0008] The present invention is achieved through the following technical solution.

[0009] One aspect of the present invention provides a self-resetting frictional long-stroke damper for a pneumatic elastic device, comprising:

[0010] The outer shell is equipped with mounting holes for pneumatic elastic devices, embedding holes for external friction plates, and openings at the piston end, which are used to provide a mounting platform for the pneumatic self-resetting module and the friction energy dissipation module.

[0011] The friction energy dissipation module, located in the embedded hole of the external friction plate, includes a perforated friction plate and inner and outer friction plates, and is used to realize the friction energy dissipation of the pneumatic self-resetting module;

[0012] The damper piston module includes a damper piston located in the mounting hole of the pneumatic elastic device, which is used to drive the pneumatic self-resetting module to be in a compressed state in both the tensile and compressed states of the damper.

[0013] The pneumatic self-resetting module, located inside the mounting hole of the pneumatic elastic device, includes two pneumatic elastic devices that carry high-pressure nitrogen gas. It is positioned between the damper piston and the friction energy dissipation module and is used to utilize the compression of high-pressure nitrogen gas to achieve the restoring force output of the damper. Under tension and compression, it drives the pneumatic elastic device to work, thereby realizing the bidirectional self-resetting function of the damper.

[0014] Preferably, the outer shell includes a steel shell, a pneumatic elastic device mounting hole opened longitudinally along the steel shell, and an external friction plate embedding hole located in front of the pneumatic elastic device mounting hole and opened transversely along the steel shell. A fixed end connecting plate is provided at the front end of the external friction plate embedding hole; a piston end opening is provided at the rear end of the pneumatic elastic device mounting hole.

[0015] Preferably, the upper and lower ends of the opening at the piston end are provided with preload bolts for connecting and fixing the pneumatic self-resetting module.

[0016] Preferably, the friction energy dissipation module includes an internal friction plate and two external friction plates respectively disposed on its outer side. A perforated friction plate is provided between the external friction plate and the internal friction plate. A piston connection hole is provided longitudinally along the internal friction plate, and a pre-tightening bolt hole is provided transversely along the two external friction plates and the internal friction plate.

[0017] Preferably, the internal friction plate is provided with a sliding groove that cooperates with the guide rail inside the outer shell to guide the internal friction plate to slide in a specific direction.

[0018] Preferably, the perforated friction pad is made of brass, with a friction coefficient controlled between 0.35 and 0.40, and a thickness of 2 mm.

[0019] Preferably, the damper piston module includes a damper piston connected to the friction energy dissipation module and a piston connecting plate that passes through an opening at the end of the piston, with a limit ring connected to the damper piston.

[0020] Preferably, the pneumatic self-resetting module includes a pair of pneumatic elastic devices and a bottom limiting plate and a top limiting plate respectively disposed at both ends of the pneumatic elastic devices. The bottom limiting plate and the top limiting plate are provided with piston holes for passing through the damper piston in the middle. The bottom of the bottom limiting plate and the top limiting plate are fixed by buckles and buckle bolts.

[0021] Preferably, the pneumatic elastic device includes a cylinder, a piston rod for compressing gas located inside the cylinder, a piston seal ring disposed between the cylinder and the piston rod, and a gas valve located at the bottom of the cylinder, wherein high-pressure nitrogen is injected into the cylinder.

[0022] In another aspect, the present invention provides a bidirectional reset method for the damper, comprising:

[0023] In the initial state, an initial preload displacement u is applied to the aeroelastic device to obtain the restoring force f of the aeroelastic device. s ;

[0024] By applying bolt preload to the two bolts of the friction energy dissipation module, the friction slippage force of the friction energy dissipation module is obtained.

[0025] When the damper is stretched, the damper piston pulls the internal friction plate and the perforated friction plate to generate relative sliding, producing a stable frictional force f. c ;

[0026] The forward movement of the internal friction plate causes the bottom limiting plate to simultaneously compress the two pneumatic elastic devices, providing a restoring force to the damper. The magnitude of the restoring force is f. s ;

[0027] As the tensile displacement increases, the frictional force remains constant; the restoring force of the pneumatic elastic device increases with the increase of the internal high-pressure nitrogen pressure.

[0028] When the damper is compressed, the damper piston pushes the internal friction plate and the perforated friction plate to produce relative sliding, generating a stable frictional force f. c ;

[0029] The limiting ring fixed on the damper piston pushes the top limiting plate to compress, which in turn compresses the two pneumatic elastic devices to provide restoring force for the damper;

[0030] Calculate the damper yield force f y and peak force f u .

[0031] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0032] Compared to existing pneumatic elastic devices, which are unidirectional compression elements and have difficulty achieving recovery under bidirectional loading conditions of tension and compression, this invention combines a friction energy dissipation module with a limiting device to drive the pneumatic elastic device to work under both tension and compression conditions, achieving bidirectional self-resetting function; it has both energy dissipation and self-resetting capabilities.

[0033] Using a pneumatic elastic device as the self-resetting component of the damper, it is installed in the building structure. The pneumatic elastic device filled with high-pressure nitrogen provides elastic self-resetting effect, achieving stable self-resetting under long stroke. It can effectively reduce the peak inter-story deformation and post-earthquake residual deformation of the structure, reduce the seismic loss of the building, and is suitable for the seismic design and toughness improvement of new and existing building structures.

[0034] This structure boasts advantages such as compact design, stable performance, ease of installation, and significantly improved seismic toughness. It has the following characteristics:

[0035] 1. Excellent fatigue performance: Under 30 cycles of loading, the peak force and restoring force fluctuations are less than ±5%, which is far superior to existing self-resetting dampers and fully meets the fatigue performance requirements of dampers in Chinese standards.

[0036] 2. Stable performance: It is minimally affected by the loading frequency. Under different frequency load excitations, the energy dissipation change rate of the damper is less than 0.5%.

[0037] 3. Low post-yield stiffness effectively reduces inter-story acceleration and shear force caused by earthquakes; through seismic time-history nonlinear analysis of an eight-story structure: compared with traditional buckling-restrained bracing, shape memory alloy self-resetting friction damper bracing, and disc spring friction damper bracing, the friction self-resetting damper bracing structure with aeroelastic device can reduce residual inter-story displacement by 87.1%, top-floor acceleration by 31.7%, and base shear force by 27.2% under earthquakes, significantly improving the post-earthquake recoverability of the structure.

[0038] 4. The elastic restoring force of the pneumatic self-resetting module is flexibly adjustable: the elastic restoring force can be flexibly adjusted simply by changing the pressure of the high-pressure nitrogen gas filled in the pneumatic elastic device. The self-resetting force is precisely controlled by the pneumatic elastic module, and it is easy to install without the need for on-site pre-compression, which facilitates modular assembly.

[0039] 5. Bidirectional self-resetting energy dissipation: The limiting structure enables self-resetting energy dissipation in both tensile and compressive directions.

[0040] 6. Friction force and restoring force can be designed independently, and the two parts work in parallel to achieve adjustable high energy consumption and stable self-resetting performance.

[0041] 7. Small size and light weight: Under the same load-bearing capacity and post-yield stiffness, the volume is less than 1 / 4 and the weight is less than 1 / 5 of that of a disc spring reset device. This effectively reduces the structural self-weight and saves on construction and structural civil engineering costs.

[0042] 8. Large stroke and high displacement tolerance: The maximum stroke is over 200mm, which can meet the seismic requirements of various structures. Attached Figure Description

[0043] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, do not constitute an undue limitation of the invention. In the drawings:

[0044] Figure 1 A schematic diagram of the external structure of the damper assembly;

[0045] Figure 2 This is a schematic diagram of the internal structure of the damper;

[0046] Figure 3 This is a schematic diagram of the damper housing structure.

[0047] Figure 4 This is a schematic diagram of the friction energy dissipation module structure;

[0048] Figure 5 This is a schematic diagram of the friction plate structure;

[0049] Figure 6 This is a schematic diagram of the damper piston module structure;

[0050] Figure 7 This is a schematic diagram of the piston and connecting plate structure;

[0051] Figure 8 This is a schematic diagram of the pneumatic self-resetting module.

[0052] In the diagram: 20-Pneumatic self-resetting module; 21-Pneumatic elastic device; 211-Piston column; 212-Cylinder body; 213-Piston seal ring; 214-Air valve; 215-High-pressure nitrogen.

[0053] 22-Bottom limiting plate, 23-Top limiting plate, 24-Snap fastener, 25-Snap fastener bolt, 26-Piston hole;

[0054] 30-Friction energy dissipation module, 31-Internal friction plate, 32-External friction plate, 33-Perforated friction plate, 34-Piston connection hole, 35-Preload bolt, 36-Slide groove;

[0055] 40-Outer shell, 41-Preload bolt, 42-Steel shell, 43-Mounting hole for pneumatic elastic device, 44-Embedding hole for external friction plate, 45-Opening at piston end, 46-Fixed end connecting plate;

[0056] 60-Damper piston module; 61-Damper piston; 62-Piston connecting plate; 63-Limit ring. Detailed Implementation

[0057] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0058] like Figure 1 , Figure 2 As shown in the figure, an embodiment of the present invention provides a self-resetting friction long-stroke damper for a pneumatic elastic device, comprising: a housing 40, having a pneumatic elastic device mounting hole 43, an external friction plate embedding hole 44, and a piston end opening 45 disposed on a steel housing 42 and thereon, for providing a mounting platform for a pneumatic self-resetting module 20 and a friction energy dissipation module 30.

[0059] The friction energy dissipation module 30, located in the embedding hole 44 of the external friction plate, includes a perforated friction plate and inner and outer friction plates 31, and is used to realize the friction energy dissipation of the pneumatic self-resetting module 20.

[0060] The damper piston module 60 includes a damper piston 61 located in the pneumatic elastic device mounting hole 43, which is used to reliably connect the damper as a whole to the main structure of the building, bear the external force transmission and post-earthquake reset action, realize the force transmission and restoring force excitation in the tensile and compressive directions, and the fixed end connecting plate is integrated with the shell to realize the rigid anchoring between the damper and the structure.

[0061] The pneumatic self-resetting module 20 is located inside the pneumatic elastic device mounting hole 43. It includes two pneumatic elastic devices 21 connected to high-pressure nitrogen gas. It is set between the damper piston 61 and the friction energy dissipation module 30. It is used to use high-pressure nitrogen gas 215 to compress and realize the restoring force output of the damper. It drives the pneumatic elastic device to work under tension and compression to realize the bidirectional self-resetting function.

[0062] like Figure 3 As shown, the outer casing 40 includes a steel shell 42, a pneumatic elastic device mounting hole 43, an external friction plate embedding hole 44, a pneumatic elastic device preload bolt 41, and a piston end opening 45. The pneumatic elastic device mounting hole 43 is longitudinally formed along the steel shell 42. The external friction plate embedding hole 44 is located in front of the pneumatic elastic device mounting hole 43 and transversely formed along the steel shell 42. A fixed end connecting plate 46 is provided at the front end of the external friction plate embedding hole 44. The piston end opening 45 is provided at the rear end of the pneumatic elastic device mounting hole 43. The upper and lower ends of the piston end opening 45 are provided with preload bolts 41 for connecting the pneumatic elastic device 21, realizing the overall installation and external connection functions. It is used to adjust the initial compression of the pneumatic elastic device 21 to control its initial restoring force output.

[0063] The pneumatic self-resetting module 20 is placed in the pneumatic elastic device mounting hole 43, and the friction energy dissipation module 30 is located in the external friction plate embedding hole 44.

[0064] like Figure 4 , Figure 5 As shown, the friction energy dissipation module 30 includes an internal friction plate 31, an external friction plate 32, a perforated friction pad 33, and a preload bolt 35 for applying preload force. The internal friction plate is provided with a piston connection hole 34.

[0065] The structure of the internal friction plate 31 and the perforated friction pad 33 is shown in the figure. Figure 5 As shown, the perforated friction plate and the inner and outer friction plates are used to achieve frictional energy dissipation of the pneumatic self-resetting module 20. Two outer friction plates 32 are respectively provided on the outer side of the inner friction plate 31. A perforated friction plate 33 is provided between the outer friction plates 32 and the inner friction plate 31. A piston connection hole 34 is provided longitudinally along the inner friction plate 31, and pre-tightening bolt holes are provided transversely along the two outer friction plates 32 and the inner friction plate 31. The inner friction plate 31 is provided with a sliding groove 36, which cooperates with the guide rail inside the outer casing 40 to guide the inner friction plate 31 to slide in a specific direction. Figure 6 As shown.

[0066] The friction interface uses NM400 steel and brass sheets, with a friction coefficient μ controlled between 0.35 and 0.40, preferably 0.37, and a thickness of 2 mm. A total preload P is applied to the preload bolts 35, providing a stable and controllable frictional force f when the damper moves. c =μP, thereby achieving good seismic energy dissipation performance.

[0067] like Figure 6 As shown, the damper piston module 60 includes a damper piston 61 connected to the friction energy dissipation module 30 and a piston connecting plate 62 that passes through the piston end opening 45. A limit ring 63 is connected to the damper piston 61, which can trigger the pneumatic elastic device 21 to compress during tensile and compressive loading, respectively, to achieve bidirectional recovery function and form a self-resetting characteristic of closed hysteresis performance.

[0068] like Figure 7 As shown, the pneumatic self-resetting module 20 includes two pneumatic elastic devices 21, a bottom limiting plate 22, a top limiting plate 23, a buckle 24, and a buckle bolt 25. The two ends of the pair of pneumatic elastic devices 21 are provided with a bottom limiting plate 22 and a top limiting plate 23. The bottom limiting plate 22 and the top limiting plate 23 have piston holes 26 in the middle for passing through the damper piston 61, guiding the movement of the damper piston 61. The bottom of the bottom limiting plate 22 and the top limiting plate 23 are fixed to the bottom by the buckle 24 and the buckle bolt 25. The piston of the pneumatic elastic device 21 is aligned and positioned within the piston hole 26.

[0069] like Figure 8As shown, the pneumatic elastic device 21 includes a cylinder 212, a piston rod 211 located inside the cylinder 212 for compressing gas during operation, a piston seal ring 213 located at the ends of the piston rod 211 and the cylinder 212, a gas valve 214 located at the bottom of the cylinder 212, and a high-pressure nitrogen gas 215 for receiving the gas injected into the cylinder.

[0070] In the pneumatic elastic device, the cylinder 212 is used to carry the high-pressure nitrogen gas that is filled into the cylinder by the gas valve 214, the piston seal ring 214 can prevent nitrogen gas leakage, and a stable elastic force is generated when the piston rod 211 is compressed.

[0071] The installation steps of the damper of this invention are as follows:

[0072] 1) such as Figure 8 As shown, the cylinder 212, piston rod 211 and piston seal ring 213 of the pneumatic elastic device 21 are assembled, and a gas valve 214 is installed at the bottom of the cylinder 212. High-pressure nitrogen gas 215 is injected into the cylinder 212 through the gas valve 214, and the pneumatic elastic device is assembled.

[0073] 2) such as Figure 7 As shown, two pneumatic elastic devices 21 are symmetrically installed between the bottom limiting plate 22 and the top limiting plate 23 on both sides of the piston hole 26 to ensure that the two pneumatic elastic devices 21 are subjected to uniform force during the operation of the damper, and are assembled to form a pneumatic self-resetting module 20.

[0074] 3) such as Figure 3 , Figure 7 As shown, the pneumatic self-resetting module 20 is inserted into the internal cavity of the housing 40. The lower end of the module is fixed by the mounting hole 43 of the pneumatic elastic device. Then, the buckle 24 and buckle bolt 25 are installed to restrict the self-resetting module to slide parallel to the compression direction of the pneumatic elastic device 21. The pre-compression displacement u is adjusted by the pre-compression bolt 41 of the pneumatic elastic device to output the preset restoring force to meet the design conditions.

[0075] 4) such as Figure 4 , Figure 7 As shown, the piston assembly is installed as follows: the inner friction plate 31 is inserted into the damper housing 40 through the outer friction plate embedding hole 44. The damper piston 61 is then inserted through the piston hole 26 on the bottom limiting plate 22 and the top limiting plate 23, and connected to the pre-set piston connection hole 34 on the inner friction plate 31. Subsequently, the limiting ring 63 is installed and tightly fitted to the top limiting plate 23 to form a bidirectional limiting structure. The piston end and the friction plate have smooth force transmission, ensuring that the pneumatic elastic device can be compressed to generate restoring force under the tensile and compressive forces of the structure.

[0076] 5) such as Figure 3 , Figure 4As shown, the friction energy dissipation module 30 is installed as follows: the perforated friction plate 33 and the external friction plate 32 are sequentially installed on the outer friction plate embedded hole 44 on the outer casing 40. The inner friction plate 31, the perforated friction plate 33, and the external friction plate 32 are tightly fitted together, and the friction surface is flat and free of contamination. Then, the pre-tightening bolts 35 are used to tighten them evenly and symmetrically, and a standard pre-tightening force is applied to form a stable friction contact interface.

[0077] 6) Thoroughly inspect all sliding surfaces, limit rings, piston holes, friction interfaces, and guide rails to ensure tight fit. Only after confirming that the friction unit moves smoothly, has stable restoring force, and that the assembly accuracy meets the drawing requirements can it be officially put into engineering use.

[0078] This invention further provides a bidirectional reset method for a self-resetting friction long-stroke damper of a pneumatic elastic device, comprising the following steps:

[0079] The pneumatic elastic device generates a stable restoring force through high-pressure nitrogen compression, and has an internal gas pressure P. i Effective trip u s Given the piston area A and the air chamber volume V, the initial force f of the pneumatic elastic device is... si :

[0080] f si =P i A

[0081] When the preloaded bolt 41 extends and preloads the top limiting plate 23, a preload displacement u is applied to the pneumatic elastic device. The restoring force of the pneumatic elastic device can be controlled and increased. The restoring force is:

[0082]

[0083] The compressibility index of nitrogen is γ = 1.4.

[0084] In the pneumatic self-resetting module 20, the pneumatic elastic device 21 is compressed bidirectionally under the action of the limiting device, generating a restoring force to achieve the self-resetting of the structure.

[0085] By applying bolt preload to the two bolts of the friction energy dissipation module 30, the friction slippage force f of the friction energy dissipation module is obtained. c ;

[0086] When the damper is in tension operation, the damper piston 61 pulls the internal friction plate 31 and the perforated friction plate 33 to generate relative sliding, thereby generating a stable frictional force f. c At the same time, the internal friction plate 31 moves forward, causing the bottom limiting plate 22 to simultaneously compress the two pneumatic elastic devices 21, thereby providing a restoring force to the damper. The magnitude of the restoring force is equal to the initial force f. sAs the tensile displacement increases, the frictional force remains constant, while the restoring force generated by the pneumatic elastic device 21 increases with the increase of the internal high-pressure nitrogen gas 215.

[0087] When the damper is in a compressed state, the damper piston 61 pushes the internal friction plate 31 and the perforated friction plate 33 to slide relative to each other, thereby generating a stable frictional force f. c At the same time, the pneumatic elastic device limiting ring 63 fixed on the damper piston 61 pushes the top limiting plate 23 to compress the two pneumatic elastic devices 21, providing restoring force for the damper.

[0088] During tensile and compressive loading, the friction energy dissipation module provides stable energy dissipation. In the pneumatic self-resetting module, the pneumatic elastic device is bidirectionally compressed under the action of the limiting device, generating a restoring force to achieve structural self-resetting. The friction energy dissipation module and the pneumatic self-resetting module are connected in parallel. The damper hysteresis curve is formed by combining the rectangular ring of the friction energy dissipation module and the ideal elastic-plastic curve of the pneumatic self-resetting module, forming a typical flag-shaped hysteresis loop. The damper yield force f... y and peak force f u The calculation formula is as follows:

[0089] f y =f c +f s

[0090]

[0091] Among them, f c P is the frictional slippage force; i V is the pressure of high-pressure nitrogen; A is the volume of the cylinder; u is the cross-sectional area of ​​the piston rod; l is the displacement of the pneumatic elastic device and the compression displacement; and γ is the peak displacement of the damper. The compressibility index of nitrogen is 1.4.

[0092] The post-yield stiffness k2 of the damper is mainly determined by the post-yield stiffness of the aeroelastic device. Experiments show that by adjusting parameters such as its stroke and internal air pressure, the post-yield stiffness of the damper can be achieved to be 0.08–0.46 kN / mm, thus enabling the self-resetting damper to have a relatively small post-yield stiffness.

[0093] The following verification experiments will further illustrate the effectiveness of the present invention.

[0094] A pneumatic self-resetting friction damper prototype was fabricated based on the above invention, and fatigue performance tests were conducted. The damper uses two initial forces (f) si The effective stroke is 15kN, and the effective stroke is (u sA 125mm aeroelastic device was used as the reset device. Therefore, the reset force of the damper self-resetting module was 30kN, and its subsequent yield stiffness was calculated to be 0.18kN / mm. A bolt preload of 10kN was applied to each of the two bolts of the friction energy dissipation module, resulting in a friction slippage force of 15kN. The damper was subjected to 30 cycles of cyclic loading at the design displacement (40mm), using a sine wave with a loading frequency of 0.1Hz. The damper loading device and hysteresis curve are shown in the figure below. The test results show that the damper's subsequent yield stiffness is low, and the load change is small after entering the post-yield stage. The damper exhibited excellent fatigue resistance after 30 cycles of cyclic loading. During the cyclic loading process, the hysteresis curves of each specimen highly overlapped, and no obvious pinching or degradation of bearing capacity or restoring force was observed. The peak load and restoring force fluctuations of the test specimens were both within ±2kN, far below the ±15% allowable threshold specified in the "Technical Code for Energy Dissipation and Vibration Reduction of Buildings". This stability is attributed to the high-pressure nitrogen gas compression energy storage mechanism: the non-polar properties of nitrogen molecules under high pressure prevent chemical oxidation of the friction pair, and the leakage rate of the sealing system is less than 0.05% / year, thus ensuring the consistency of long-term mechanical properties.

[0095] This invention is not limited to the above embodiments. Based on the technical solutions disclosed in this invention, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A self-resetting frictional long-stroke damper for a pneumatic elastic device, characterized in that, include: The outer casing (40) is provided with a pneumatic elastic device mounting hole (43), an external friction plate embedding hole (44) and a piston end opening (45) on the steel casing (42) and thereon, for providing a mounting platform for the pneumatic self-resetting module (20) and the friction energy dissipation module (30); The friction energy dissipation module (30) is located in the embedding hole (44) of the external friction plate and includes a perforated friction plate (33) and inner and outer friction plates (31) and (32) to realize the friction energy dissipation of the pneumatic self-resetting module (20); The damper piston module (60) includes a damper piston (61) located in the pneumatic elastic device mounting hole (43) for driving the pneumatic self-resetting module (20) to be in a compressed state in both the damper tension and compression states. The pneumatic self-resetting module (20) is located inside the pneumatic elastic device mounting hole (43). It includes two pneumatic elastic devices (21) that carry high-pressure nitrogen gas. It is set between the damper piston (61) and the friction energy dissipation module (30). It is used to realize the restoring force output of the damper by compressing high-pressure nitrogen gas (215). It drives the pneumatic elastic device (21) to work under tension and compression to realize the bidirectional self-resetting function of the damper.

2. The self-resetting frictional long-stroke damper of a pneumatic elastic device according to claim 1, characterized in that, The outer shell (40) includes a steel shell (42), a pneumatic elastic device mounting hole (43) opened longitudinally along the steel shell (42), and an external friction plate embedding hole (44) located in front of the pneumatic elastic device mounting hole (43) and opened laterally along the steel shell (42). A fixed end connecting plate (46) is provided at the front end of the external friction plate embedding hole (44); a piston end opening (45) is opened at the tail end of the pneumatic elastic device mounting hole (43).

3. The self-resetting frictional long-stroke damper of a pneumatic elastic device according to claim 2, characterized in that, The upper and lower ends of the piston end opening (45) are provided with preload bolts (41) for fixing the pneumatic self-resetting module (20).

4. The self-resetting frictional long-stroke damper of a pneumatic elastic device according to claim 1, characterized in that, The friction energy dissipation module (30) includes an internal friction plate (31) and two external friction plates (32) respectively located on its outer side. A perforated friction plate (33) is provided between the external friction plate (32) and the internal friction plate (31). A piston connection hole (34) is provided longitudinally along the internal friction plate (31), and a pre-tightening bolt hole is provided transversely along the two external friction plates (32) and the internal friction plate (31).

5. The self-resetting frictional long-stroke damper of a pneumatic elastic device according to claim 4, characterized in that, The internal friction plate (31) is provided with a groove (36) that cooperates with the inner guide rail of the outer shell (40) to guide the internal friction plate (31) to slide in a specific direction.

6. The self-resetting frictional long-stroke damper of a pneumatic elastic device according to claim 4, characterized in that, The perforated friction plate (33) is made of brass, with a friction coefficient controlled between 0.35 and 0.40 and a thickness of 2 mm.

7. The self-resetting frictional long-stroke damper of a pneumatic elastic device according to claim 1, characterized in that, The damper piston module (60) includes a damper piston (61) connected to the friction energy dissipation module (30) and a piston connecting plate (62) passing through the piston end opening (45), and a limit ring (63) is connected to the damper piston (61).

8. The self-resetting frictional long-stroke damper of a pneumatic elastic device according to claim 1, characterized in that, The pneumatic self-resetting module (20) includes a pair of pneumatic elastic devices (21) and a bottom limiting plate (22) and a top limiting plate (23) respectively located at both ends of the pneumatic elastic devices (21). The bottom limiting plate (22) and the top limiting plate (23) are provided with piston holes (26) for passing through the damper piston (61) in the middle. The bottom limiting plate (22) and the top limiting plate (23) are fixed at the bottom by buckles (24) and buckle bolts (25).

9. The self-resetting frictional long-stroke damper of a pneumatic elastic device according to claim 8, characterized in that, The pneumatic elastic device (21) includes a cylinder (212), a piston rod (211) located inside the cylinder (212) for compressing gas, a piston seal ring (213) located between the cylinder (212) and the piston rod (211), and a gas valve (214) located at the bottom of the cylinder (212). High-pressure nitrogen gas (215) is injected into the cylinder.

10. A bidirectional reset method for a self-resetting frictional long-stroke damper of a pneumatic elastic device as described in any one of claims 1 to 9, characterized in that, include: In the initial state, an initial preload displacement u is applied to the aeroelastic device (21) to obtain the restoring force f of the aeroelastic device. s ; Apply bolt preload to the two bolts of the friction energy dissipation module (30) to obtain the friction slippage force of the friction energy dissipation module; When the damper is stretched, the damper piston (61) pulls the internal friction plate (31) and the perforated friction plate (33) to generate relative sliding, producing a stable frictional force f. c ; The internal friction plate (31) moves forward, causing the bottom limiting plate (22) to simultaneously compress the two pneumatic elastic devices (21), providing a restoring force f for the damper. s ; As the tensile displacement increases, the frictional force remains constant; the restoring force of the pneumatic elastic device (21) increases with the increase of the internal high-pressure nitrogen gas (215); When the damper is compressed, the damper piston (61) pushes the internal friction plate (31) and the perforated friction plate (33) to generate relative sliding, producing a stable frictional force f. c ; The limiting ring (63) fixed on the damper piston (61) pushes the top limiting plate (23) to compress, and at the same time compresses the two pneumatic elastic devices (21) to provide restoring force for the damper; Calculate the damper yield force f y and peak force f u : f y =f c +f s Among them, f c P is the frictional slippage force; i V is the pressure of high-pressure nitrogen; A is the volume of the cylinder; u is the cross-sectional area of ​​the piston rod; l is the pre-compression displacement of the pneumatic elastic device; γ is the peak displacement of the damper; and γ is the compression index of nitrogen.

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