Dual-stage intelligent shock-absorbing and impact-damping dual-purpose damper

Abstract

The present application relates to a kind of two-stage intelligent shock-absorbing dual-purpose damper, belong to the field of building damping.The damper includes front clamp, piston rod, main cylinder, excitation coil, groove, auxiliary cylinder, front end cover, front sealing body, magnetorheological shear thickening fluid, piston, rear sealing body, rear clamp;The damping fluid used in the damper is a new type of multifunctional intelligent material, its damping and viscosity can change rapidly under the action of magnetic field and strain rate field.Compared with traditional damping fluid, it has the advantages of fast response speed, good energy consumption effect, real-time control, etc., can better cope with impact conditions, so as to have good shock-absorbing and impact resistance characteristics.Compared with traditional damper, the magnetorheological shear thickening fluid is more sensitive to impact conditions of different rates due to the grooves at both ends, and the depth and width of the grooves can be more conveniently adjusted according to actual conditions, so as to more efficiently dissipate external impact energy within the specified stroke, and have better impact resistance performance.

Description

Technical Field

[0001] This invention belongs to the field of building vibration reduction, specifically relating to a dual-stage intelligent vibration reduction and shock-resistant damper. Background Technology

[0002] Suppressing harmful vibrations and reducing or mitigating impacts have always been pressing issues for the engineering and academic communities. Vibration reduction is a widely used technology in vibration control, and vibration dampers, as components connecting equipment and foundations, are used to reduce and eliminate the vibrational forces transmitted from the equipment to the foundation and the vibrations transmitted from the foundation to the equipment. For traditional vibration reduction technologies, a fixed-type vibration damping device has a relatively simple damping mechanism. Especially when encountering external excitations with a wide frequency range, the internal losses of the vibration damping device are enormous, which will significantly reduce the service life of the vibration damping device.

[0003] With the rapid advancements in science and technology, the next stage of engineering structure development will produce a new generation of engineering structures: intelligent engineering structures. These structures can activate control devices when necessary to minimize the impact of extreme loads and ensure the normal operational performance of the structure. Among existing control strategies, semi-active control strategies have received considerable attention because they not only provide reliable passive control but also retain the versatility and applicability of active control. Intelligent engineering structures based on semi-active vibration control will undoubtedly demonstrate immense application potential in the field of major and complex engineering construction.

[0004] Although shear-thickening materials can help vibration damping actuators achieve adaptive and self-reinforcing functions based on external load excitation, this is only a passive response to external excitation, and the performance cannot be directionally controllable. Summary of the Invention

[0005] To address the aforementioned technical challenges, this invention combines the performance advantages of shear-thickening materials and magnetorheological materials, and provides technical support and theoretical basis for the development of intelligent vibration damping devices. It offers a dual-stage intelligent vibration damping and shock-resistant damper based on a magnetorheological shear-thickening fluid.

[0006] Magnetorheological materials can rely on external magnetic fields to provide self-adjusting functions for vibration damping actuators, achieving controllable performance. Therefore, integrating the rate-sensitivity characteristics of shear-thickening materials with the magnetic sensitivity characteristics of magnetorheological materials will provide a promising approach and future prospects for the application of novel intelligent vibration damping devices in the construction field.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A dual-stage intelligent vibration reduction and shock-resistant damper includes a front clamp, a piston rod, a main cylinder, an excitation coil, grooves, a secondary cylinder, a front end cover, a front sealing body, a magnetorheological shear thickening fluid, a piston, a rear sealing body, and a rear clamp. The front clamp is threaded to the front of the piston rod; the front and rear sealing bodies are located at both ends of the main cylinder and maintain a sealed fit. The front end cover is threaded to the front of the main cylinder to fix the front sealing body; the front of the secondary cylinder is threaded to the rear of the main cylinder to fix the rear sealing body; the rear clamp is threaded to the rear of the secondary cylinder; the piston and piston rod are fixed to the middle of the piston rod by a threaded connection; the excitation coil is wound on the piston; a wire outlet hole is drilled at the rear of the piston rod; the gap between the piston and the main cylinder is the working channel for the magnetorheological shear thickening fluid; grooves are evenly distributed at both ends of the main cylinder.

[0008] Furthermore, the magnetorheological shear thickening material is a smart material that simultaneously possesses strain rate sensitivity and magnetic sensitivity characteristics. It can passively respond to different external stimuli to realize the change of system viscosity under different force fields, and it can also achieve precise adjustment of system viscosity under different magnetic fields through active control of external magnetic fields.

[0009] Furthermore, the depth of the trench changes uniformly with its length.

[0010] Furthermore, the front sealing body and the rear sealing body are provided with multiple sealing rings and guide structures.

[0011] Furthermore, a magnetic shielding sheet is provided inside the excitation coil.

[0012] Furthermore, the auxiliary cylinder has a cable outlet window at its tail end.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The magnetorheological shear thickening fluid used in this invention, which differs from traditional damping fluids, is a novel multifunctional smart material whose viscosity changes rapidly under the influence of a magnetic field. Compared with traditional damping fluids, it has advantages such as fast response speed, strong energy dissipation effect, and real-time control. Furthermore, compared with traditional magnetorheological fluids, it overcomes the disadvantage of lacking protection after power failure, exhibiting greater adaptability and better handling of impact conditions, thus possessing excellent vibration reduction and shock resistance capabilities.

[0014] 2. Compared with traditional dampers, the grooves at both ends of this invention make the magnetorheological shear thickening fluid more sensitive to impact conditions of different rates. At the same time, the depth and width of the grooves can be more easily modified according to the actual situation, and the impact energy can be dissipated more efficiently within the specified stroke, resulting in better impact resistance characteristics.

[0015] 3. Compared with traditional magnetorheological dampers, it is divided into two stages: vibration reduction stage and shock resistance stage, which makes it more adaptable, more manufacturable, easier to assemble, and more reliable.

[0016] 4. Compared with traditional dampers, this damper has the advantages of fast response speed, strong energy dissipation effect, and real-time control. It is more adaptable and can better cope with impact conditions, thus having excellent vibration reduction, shock resistance and energy dissipation characteristics. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a dual-stage intelligent vibration reduction and shock-resistant damper according to the present invention. Figure 2 This is a schematic diagram of the trench arrangement of the present invention.

[0018] Among them, 1-front clamp, 2-piston rod, 3-main cylinder, 4-excitation coil, 5-groove, 6-auxiliary cylinder, 7-front end cover, 8-front seal, 9-magnetorheological shear thickening fluid, 10-piston, 11-rear seal, 12-rear clamp. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0020] Figure 1 , Figure 2 As shown, a dual-stage intelligent vibration reduction and shock-resistant damper of the present invention includes a front clamp 1, a piston rod 2, a main cylinder 3, an excitation coil 4, a groove 5, a secondary cylinder 6, a front end cover 7, a front sealing body 8, a magnetorheological shear thickening fluid (MR-STF) 9, a piston 10, a rear sealing body 11, and a rear clamp 12. The front clamp 1 is threadedly connected to the front of the piston rod 2; the front seal 8 and the rear seal 11 are located at both ends of the main cylinder 3 and maintain a sealed fit; the front cover 7 is threadedly connected to the front of the main cylinder 3, fixing the front seal 8; the front of the auxiliary cylinder 6 is connected to the rear of the main cylinder 3 via an external thread, fixing the rear seal 11; the rear clamp 12 is connected to the rear of the auxiliary cylinder 6 via an external thread; the piston 10 is threadedly connected to the piston rod 2 and fixed in the middle of the piston rod 2; the excitation coil 4 is wound around the piston 10; a wire outlet hole is drilled at the rear of the piston rod 2; the gap between the piston 10 and the main cylinder 3 is the working channel of the magnetorheological shear thickening liquid 9; the grooves 5 are evenly distributed at both ends of the main cylinder 3, and the positions of the front seal 8 and the rear seal 11 are set at the corresponding ends of the main cylinder 3. The wire of the excitation coil 4 is led out through the wire outlet hole of the piston rod 2.

[0021] Preferably, the cross-section of the groove 5 is a right trapezoid, and the acute angle of the right trapezoid corresponds to the position where the front seal 8 and the rear seal 11 are set at both ends of the main cylinder 3. The length of the long side of the right trapezoid is greater than the thickness of the front seal 8 and the rear seal 11 at both ends of the main cylinder 3 along the damper axial direction.

[0022] Preferably, the depth of the groove 5 changes uniformly with the length, the front sealing body 8 and the rear sealing body 11 are provided with multiple sealing rings and guide structures, the excitation coil 4 is provided with a magnetic shielding sheet, and the tail of the auxiliary cylinder 6 has a wire outlet window.

[0023] The working process of this invention is as follows: In the initial state, the position of piston 10 is as follows: Figure 1 As shown, the middle section of the main cylinder 3 is a damping section, and the two sides are anti-impact sections. When the building vibrates due to minor earthquakes, wind vibrations, etc., the piston rod 2 moves relative to the main cylinder 3 under external excitation, driving the piston 10 to move in the middle damping section. The magnetorheological shear thickening fluid 9 is forced to flow through the damping channel, thereby generating a damping force. The damping channel is an annular channel formed between the main cylinder 3 and the piston 10. The magnetorheological shear thickening fluid 9 generates a damping force when it flows through this damping channel. By changing the current supplied to the excitation coil 4 in real time, the damping and viscosity of the magnetorheological shear thickening fluid 9 passing through the damping channel can be changed, achieving real-time controllable damping force to cope with different amplitudes and frequencies.

[0024] Under low-impact conditions, within the low-to-medium frequency range, the viscosity of the magnetorheological shear thickening fluid 9 is actively controlled by magnetic control. This dual-stage intelligent vibration isolation and shock-resistant damper device can adapt to external impact conditions. In the high-frequency range, the magnetorheological shear thickening fluid 9 can autonomously respond to external excitation, with the system viscosity increasing nonlinearly to achieve energy dissipation and vibration reduction. Specifically, under magnetic field control, the damping and viscosity of the magnetorheological shear thickening fluid 9 can change rapidly within milliseconds. By changing the magnitude of the current flowing through the excitation coil 4 in real time, the magnetic field strength can be altered, thus changing the damping and viscosity of the magnetorheological shear thickening fluid 9 passing through the damping channel. Simultaneously, the sensor measures the external excitation, and the controller calculates the required damping force in real time and outputs an appropriate current, achieving real-time controllable damping force.

[0025] Under high impact conditions, the vibration displacement of piston 10 exceeds the middle damping section and reaches the impact-resistant sections at both ends. At this point, the shape of the damping channel changes from an annular channel to a grooved channel, thus changing the area of ​​the groove. This damping channel shape makes the magnetorheological shear thickening fluid 9 more sensitive to different speed conditions, which is beneficial to improving the overall impact resistance of the damper. At the same time, the width and number of grooves 5 can be changed according to the actual damping force requirements. The depth-length curve can be calculated through design to dissipate impact energy more efficiently within a specified stroke.

Claims

1. A dual-stage intelligent vibration reduction and shock-resistant damper, characterized in that, The system includes a front clamp, piston rod, main cylinder, excitation coil, grooves, auxiliary cylinder, front end cap, front seal, magnetorheological shear thickening fluid, piston, rear seal, and rear clamp. The front clamp is threaded to the front of the piston rod; the front and rear seals are located at both ends of the main cylinder and maintain a sealed fit. The front end cap is threaded to the front of the main cylinder to fix the front seal. The front of the auxiliary cylinder is threaded to the rear of the main cylinder to fix the rear seal. The rear clamp is threaded to the rear of the auxiliary cylinder. The piston and piston rod are threaded together and fixed in the middle of the piston rod. The excitation coil is wound around the piston. A wire outlet hole is drilled at the rear of the piston rod. The gap between the piston and the main cylinder is the working channel for the magnetorheological shear thickening fluid. Grooves are evenly distributed at both ends of the main cylinder. The main cylinder has a damping section in the middle and anti-impact sections on both sides. Under large impact conditions, when the vibration displacement of the piston exceeds the damping section in the middle and reaches the anti-impact sections at both ends, the shape of the damping channel changes from an annular channel to a grooved channel. The grooves are evenly distributed along the axial direction of the main cylinder at both ends of the inner wall of the cylinder, forming an impact-resistant working section that smoothly connects with the middle equal-diameter vibration damping section.

2. The dual-stage intelligent vibration reduction and shock-resistant damper according to claim 1, characterized in that, The magnetorheological shear thickening fluid is a smart material that simultaneously possesses strain rate sensitivity and magnetic sensitivity. It can passively respond to different external stimuli to achieve changes in the system viscosity under different force fields, and it can also achieve precise adjustment of the system viscosity under different magnetic fields through active control of external magnetic fields.

3. The dual-stage intelligent vibration reduction and shock-resistant damper according to claim 1, characterized in that, The depth of the trench changes uniformly with its length.

4. The dual-stage intelligent vibration reduction and shock-resistant damper according to claim 1, characterized in that, The front and rear sealing bodies are provided with multiple sealing rings and guide structures.

5. A dual-stage intelligent vibration reduction and shock-resistant damper according to claim 1, characterized in that, The excitation coil is equipped with a magnetic shielding sheet.

6. A dual-stage intelligent vibration reduction and shock-resistant damper according to claim 1, characterized in that, The auxiliary cylinder has a cable outlet window at its rear.

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