A vibration reduction device for pipelines crossing embankments based on hybrid adaptive control of MRD and TMD

Abstract

This invention discloses a vibration reduction device for pipelines crossing embankments based on hybrid adaptive control of MRD and TMD. The device includes a hollow rubber ring, a tuned mass damper, and a magnetorheological damper. The tuned mass damper and the magnetorheological damper are installed parallel to each other within the hollow rubber ring. The lower ends of the tuned mass damper and the magnetorheological damper are fixed to the ground, while their upper ends are fixed to the pipeline via pipe clamps. This vibration reduction device is applied to the vibration control of long-distance hydraulic pipelines crossing embankments. Compared to single active or passive control, this device offers a wide range of output damping forces, superior control effect, and high fault tolerance. Based on the pipeline vibration response, a data processing module and a control module output a real-time adjustable damping force, significantly reducing the vibration response of long-distance water conveyance and regulation pipelines crossing embankments in hydraulic structures.

Description

Technical Field

[0001] This invention belongs to the field of vibration control for pipelines crossing embankments in hydraulic structures, specifically relating to a vibration reduction device for pipelines crossing embankments based on a hybrid adaptive control of MRD and TMD. Background Technology

[0002] Long-distance hydraulic pipelines crossing embankments experience vibrations during water transport due to various factors, including unit operation, sudden start-up and shutdown, pipeline flow-induced vibrations, and random loads from vehicles passing over the embankment. These vibrations reduce the pipeline's load-bearing capacity and operational safety, affect the soil density around the pipeline, cause cracks in the concrete supports connecting the pipeline to the slope, and damage the embankment, endangering surrounding buildings and downstream residents. Numerous studies have demonstrated that reducing structural vibration response can be achieved through vibration reduction techniques. However, while existing single active or passive control methods can reduce structural vibration response to some extent, they also have various drawbacks (lack of reliability) and cannot fully guarantee vibration reduction efficiency, failing to significantly reduce the likelihood of accidents in engineering projects. Therefore, ensuring the safe and stable operation of pipeline projects under long-term, high-frequency vibration source excitation has become a critical issue that urgently needs to be addressed.

[0003] In existing technologies, single vibration control methods all have some shortcomings. For example, passive control is only effective for vibration reduction at specific frequencies, and it cannot effectively reduce vibration response under uncertain external excitations, or even produce the opposite effect. Active / semi-active vibration control requires an external power supply to control the damper output. When encountering extreme weather or unstable external energy input, it is difficult for the damper to output damping force in real time. Summary of the Invention

[0004] To address the problem that existing technologies for vibration control on pipelines crossing embankments rely on a single method and cannot ensure the safe and stable operation of pipeline projects, this invention provides a vibration reduction device for pipelines crossing embankments based on hybrid adaptive control of MRD and TMD, which offers superior control performance, strong practicality, and high fault tolerance.

[0005] The solution adopted by this invention to solve its technical problem is: a vibration reduction device for a pipeline crossing a dam based on MRD and TMD hybrid adaptive control, comprising a hollow rubber ring, a tuned mass damper, and a magnetorheological damper. The tuned mass damper and the magnetorheological damper are installed in parallel in the hollow rubber ring, wherein the lower ends of the tuned mass damper and the magnetorheological damper are fixed to the ground, and the upper ends of the tuned mass damper and the magnetorheological damper are respectively fixed to the pipeline by pipe clamps.

[0006] The magnetorheological damper includes a piston rod, a cylinder cover, a sealing ring, a working cylinder, a coil, magnetorheological fluid, and a base. The pipe clamp is fixed to the piston rod, the coil is fixed to the piston rod and fitted into the working cylinder, the working cylinder is filled with magnetorheological fluid, the cylinder cover is installed at the upper end of the working cylinder, a sealing ring is installed between the cylinder cover and the working cylinder, the base is installed at the bottom of the working cylinder, and the magnetorheological damper is fixed to the ground by the base. The coil is fitted on the piston rod located inside the working cylinder.

[0007] The tuned mass damper includes an upper spring, a TMD mass block, a data processing module, a control module, a lower spring, a signal sensor, and a power supply. The upper spring connects the pipe clamp and the TMD mass block, the lower spring connects the TMD mass block and the ground, and the power supply and signal sensor are connected to the TMD mass block through wires. The signal sensor is installed on the pipe.

[0008] A data processing module and a control module are installed between the upper and lower springs. The data processing module and the control module are connected by wires. The power supply is connected to the control module, and the signal sensor is connected to the data processing module.

[0009] The power source is also connected to the coil in the magnetorheological damper via wires, providing electrical energy to the coil.

[0010] The control module adopts LQR active control, and outputs the corresponding voltage signal calculated by the control module to the magnetorheological damper from the power supply.

[0011] The data processing module and control module are encapsulated and embedded in the TMD mass block, serving as part of the mass of the TMD mass block.

[0012] The pipe clamp includes an upper pipe clamp and a lower pipe clamp, which are symmetrical semi-circular structures. The upper and lower pipe clamps have horizontal flanges extending outward on both sides, and corresponding screw holes are provided on the flanges. Nuts are inserted into the screw holes to lock the upper and lower pipe clamps. The lower pipe clamp is connected to the upper end of the tuned mass damper and the magnetorheological damper.

[0013] A washer is fixed on the piston rod, and the coil is installed on the upper side of the washer, with the position of the coil fixed by the washer.

[0014] The hollow rubber ring is made of corrugated rubber tube, which is wrapped around the outside of the parallel-installed harmonic mass damper and magnetorheological damper. The upper end of the corrugated rubber tube is provided with an arc-shaped structure matching the pipeline. The corrugated rubber tube is placed between the pipeline and the ground, encapsulating the entire vibration reduction device for the pipeline through the dike.

[0015] The TMD mass block, which houses the data processing module and the control module, is wrapped in waterproof and anti-static material to protect the data processing module and the control module from external factors.

[0016] The beneficial effects of the present invention: The vibration reduction device for pipelines crossing dikes based on MRD and TMD hybrid adaptive control provided by the present invention is an active-semi-active hybrid adaptive pipeline vibration reduction control device. It provides superior control effect, strong practicality, and high fault tolerance, and can effectively ensure the safe and stable operation of pipeline projects under long-term, high-frequency vibration source excitation.

[0017] Under most normal operating conditions, the hybrid control devices jointly generate damping force to reduce structural vibration. When the vibration source excitation is complex, the MRD based on LQR (linear quadratic optimal control) active control can quickly output damping force according to the pipeline response. When the external excitation is small, the TMMRD switches to the TMD system operating state, and the MRD stops working, saving energy and extending its service life. When the power module fails and the magnetorheological damper fails, it can only provide support. At this time, the TMD can still provide damping force to reduce the pipeline vibration response. At the same time, the TMD mass block, formed by the data processing module and control module with waterproof and antistatic materials, can protect the sensitive devices of the hybrid control system. The novel active-passive hybrid adaptive control device based on MRD and TMD provided by this invention has a high fault tolerance rate and strong practicality. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the hybrid control vibration reduction device provided in an embodiment of the present invention.

[0019] Figure 2 This is a partial cross-sectional view of a magnetorheological damper (MRD) according to an embodiment of the present invention.

[0020] Figure 3 This is a partial cross-sectional view of the tuned mass damper (TMD) according to an embodiment of the present invention.

[0021] The following components are labeled in the diagram: Upper pipe clamp 1, Nut 2, Lower pipe clamp 3, Wire 4, Piston rod 5, Cylinder cap 6, Sealing ring 7, Working cylinder 8, Coil 9, Washer 10, Magnetorheological fluid 11, Base 12, Upper spring 13, TMD mass block 14, Data processing module 15, Control module 16, Lower spring 17, Signal sensor 18, Power supply 19, Hollow rubber ring 20. Detailed Implementation Plan

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The contents not described in detail in the embodiments of the present invention are prior art known to those skilled in the art.

[0023] The purpose of this invention is to provide an active-semi-active hybrid adaptive control device for pipeline vibration reduction that offers superior control performance, strong practicality, and high fault tolerance. The vibration reduction device for pipelines crossing embankments provided by this invention combines a magnetorheological damper (MRD) and a harmonic mass damper (TMD), such as... Figure 1As shown, the magnetorheological damper (MRD) and the harmonic mass damper (TMD) are installed side by side between the pipe and the ground. A hollow rubber ring 20 is also installed on the outside of the magnetorheological damper (MRD) and the harmonic mass damper (TMD). The hollow rubber ring 20 wraps the magnetorheological damper (MRD) and the harmonic mass damper (TMD) to form a whole.

[0024] Magnetorheological dampers (MRDs) combine the properties of magnetostrictive materials and electromagnetic rheotropic fluids, generating corresponding resistance when the current changes, thereby reducing structural vibration. For example... Figure 2 As shown, the magnetorheological damper includes a piston rod 5, a cylinder cover 6, a sealing ring 7, a working cylinder 8, a coil 9, a washer 10, a magnetorheological fluid 11, and a base 12. A pipe clamp is fixed to the upper end of the piston rod 5. The coil 9 is fixed on the piston rod and fitted into the working cylinder 8. The working cylinder 8 is filled with magnetorheological fluid 11. The cylinder cover 6 is installed at the upper end of the working cylinder 8. A sealing ring 7 is installed between the cylinder cover 6 and the working cylinder 8. The base 12 is installed at the bottom of the working cylinder 8. The magnetorheological damper is fixed to the ground by the base 12. The coil 9 is fitted on the piston rod 5 located inside the working cylinder 8. The washer 10 is fixed on the piston rod 5. The coil 9 is installed on the upper side of the washer 10.

[0025] The piston rod 5 is provided with a wire cavity, with the two ends of the wire cavity located at the outer end of the piston rod and inside the working cylinder 8, respectively. A wire 4 is installed in the wire cavity, with the inner end of the wire 4 extending out of the working cylinder 8 to connect to the coil 9, and the outer end extending out of the outer end of the piston rod 5 to connect to the power supply 19.

[0026] The upper end of the magnetorheological damper (MRD) is fixed to the pipe by a pipe clamp, and the lower end is fixed to the ground or a corresponding pipe bridge by a base 12. The magnetorheological damper (MRD) can be actively controlled based on LQR (linear quadratic optimal control) and can quickly output damping force according to the pipe response.

[0027] like Figure 3 As shown, the tuned mass damper (TMD) includes an upper spring 13, a TMD mass block 14, a data processing module 15, a control module 16, a lower spring 17, a signal sensor 18, and a power supply 19. The upper spring 13 connects the pipe clamp and the TMD mass block 14, the lower spring 17 connects the TMD mass block 14 and the ground, and the power supply 19 and the signal sensor 18 are respectively connected to the TMD mass block 14 through wires 4. The signal sensor 18 is installed on the pipe.

[0028] A data processing module 15 and a control module 16 are installed between the upper spring 13 and the lower spring 17. The data processing module 15 and the control module 16 are connected by wires. A power supply 19 is connected to the control module 16, and a signal sensor 18 is connected to the data processing module 15.

[0029] Tuned mass dampers (TMDs) rely on springs and mass blocks to form passive damping and reduce the vibration response of pipelines.

[0030] The signal sensor 18 is fixed below the pipeline and transmits the collected signal to the data processing module 15. The processed data is actively controlled by the control module 16 using LQR. The corresponding voltage signal calculated by the control module 16 is output by the power supply 19 to the magnetorheological damper (MRD). The magnetorheological damper (MRD) quickly and actively outputs damping force according to the pipeline response based on the input voltage to eliminate pipeline vibration.

[0031] The novel active-passive hybrid adaptive control vibration reduction device (TMMRD) provided by this invention combines a data processing module and a control module on the basis of an MRD based on LQR (linear quadratic optimal control). A TMD mass block is formed by adding a certain mass to meet the corresponding frequency. In most normal operating conditions, the hybrid control device jointly generates damping force to reduce structural vibration. When the vibration source excitation is complex, the MRD based on LQR can quickly output damping force according to the pipeline response. When the external excitation is small, the TMMRD switches to the TMD system operating state, and the MRD stops working, saving energy and extending its service life. When the power module fails and the magnetorheological damper fails, only providing support, the TMD can still provide damping force to reduce the pipeline vibration response.

[0032] This invention is applied to the field of vibration control for long-distance hydraulic pipelines crossing dikes. When installing this device, a power interface needs to be reserved on the ground. The bottom of the device is fixed to the ground, and the upper part is tightly fixed to the pipeline by pipe clamps. Its working principle is as follows.

[0033] like Figure 3 As shown, the TMD system, consisting of the TMD mass block 14 and the spring, continuously performs semi-active control on the pipe vibration. The signal sensor 18, fixed to the pipe structure, transmits the real-time collected vibration data to the data processing module 15 embedded in the TMD mass block. After filtering and noise reduction, the data is transmitted to the control module 16. The control module uses the LQR control algorithm to calculate and analyze the input signal to obtain the corresponding control voltage signal. Finally, the power supply 19 applies the voltage to the pipe. Figure 2 In the MRD system shown, coil 9 generates a corresponding magnetic field according to the voltage, so that magnetorheological fluid 11 exhibits a corresponding shear yield strength. The resulting damping force is applied to the pipe through piston rod 5, thereby counteracting pipe vibration.

[0034] The vibration damping device of this invention features a wide range of damping forces and high fault tolerance. When the vibration source excitation is small, the damping force generated by the TMD mass block alone can effectively suppress the structural vibration response. When the vibration source excitation is large or complex, the MRD can adjust the output damping force according to the real-time response, thus reducing structural vibration more quickly. When the external power supply fails, the hollow rubber ring and the TMD system can still support and dampen the pipeline, greatly improving fault tolerance and safety.

[0035] Example 2: Based on Example 1, such as Figure 2 and Figure 3 As shown, the pipe clamp adopts the following... Figure 2 and Figure 3 The symmetrical semi-circular structure shown includes an upper tube clamp 1 and a lower tube clamp 3. Both the upper tube clamp 1 and the lower tube clamp 3 are semi-circular. Horizontal flanges extend outward from both sides of the upper tube clamp 1 and the lower tube clamp 3. Corresponding screw holes are provided on the flanges. Nuts 2 are inserted into the screw holes and locked to the upper tube clamp 1 and the lower tube clamp 3 by the nuts. The lower tube clamp 3 is connected to the upper end of the harmonic mass damper and the magnetorheological damper.

[0036] The upper pipe clamp 1 and the lower pipe clamp 3 are two semi-circular structures that are clamped onto the pipe. The upper pipe clamp 1 and the lower pipe clamp 3 are locked with the nut 2, so that the upper pipe clamp 1 and the lower pipe clamp 3 are close to the pipe. The vibration generated on the pipe can be accurately and timely transmitted to the tuned mass damper (TMD) and the magnetorheological damper (MRD).

[0037] Meanwhile, the data processing module 15 and the control module 16 are encapsulated and embedded in the TMD mass block using waterproof and antistatic materials, serving as part of the mass of the TMD mass block. This also protects the sensitive devices of the hybrid control system and extends the service life of the two modules. Furthermore, the power supply 19 can also be encapsulated within the TMD mass block.

[0038] The hollow rubber ring 20 is made of corrugated rubber tube, which is wrapped around the outside of the parallel-installed harmonic mass damper and magnetorheological damper. The upper end of the corrugated rubber tube is provided with an arc-shaped structure matching the pipeline. The corrugated rubber tube is placed between the pipeline and the ground, encapsulating the entire vibration reduction device for the pipeline through the dike.

[0039] Corrugated rubber hoses possess inherent elasticity, which can be used to apply pressure to the pipe and the ground, achieving a good seal. For further reinforcement, structural adhesives or other bonding materials can be used to seal the top and bottom ends of the corrugated rubber hose. Other sealing and fixing methods are also possible.

Claims

1. A vibration reduction device for pipelines crossing embankments based on hybrid adaptive control of MRD and TMD, characterized in that, The device includes a hollow rubber ring, a TMD, and an MRD. The TMD and MRD are installed in parallel within the hollow rubber ring (20). The lower ends of the TMD and MRD are fixed to the ground, and the upper ends of the TMD and MRD are fixed to the pipes by pipe clamps. The MRD includes a piston rod (5), a cap (6), a sealing ring (7), a working cylinder (8), a coil (9), a magnetorheological fluid (11), and a base (12). The pipe clamp is fixed to the piston rod (5), and the coil (9) is fixed to the piston rod and fitted into the working cylinder (8). The working cylinder (8) is filled with magnetorheological fluid (11). The cap (6) is installed at the upper end of the working cylinder (8), and a sealing ring (7) is installed between the cap (6) and the working cylinder (8). The base (12) is installed at the bottom of the working cylinder (8), and the MRD is fixed to the ground by the base (12). The coil (9) is fitted onto the piston rod (5) located inside the working cylinder (8). The TMD The system includes an upper spring (13), a TMD mass block (14), a data processing module (15), a control module (16), a lower spring (17), a signal sensor (18), and a power supply (19). The upper spring (13) connects the pipe clamp and the TMD mass block (14), the lower spring (17) connects the TMD mass block (14) and the ground, and the power supply (19) and the signal sensor (18) are connected to the TMD mass block (14) via wires (4). The signal sensor (18) is installed on the pipe. The data processing module (15) and the control module (16) are installed between the upper spring (13) and the lower spring (17). The data processing module (15) and the control module (16) are connected via wires. The power supply (19) is connected to the control module (16), and the signal sensor (18) is connected to the data processing module (15). The power supply (19) is also connected to the coil (9) in the MRD via wires. The signal sensor (18) is fixed below the pipe and transmits the collected signal to the data processing module (15). The processed data is controlled by the control module (16) using LQR active control. The corresponding voltage signal calculated by the control module (16) is output to the MRD by the power supply (19). The active-passive hybrid adaptive control vibration reduction device is based on the MRD based on LQR active control. The data processing module and the control module are combined. A certain mass is added to form a TMD mass block that meets the corresponding frequency. In most normal working conditions, the hybrid control device generates damping force to reduce structural vibration. When the vibration source excitation is complex, the MRD based on LQR active control can quickly output damping force according to the pipe response. When the external excitation is small, the active-passive hybrid adaptive control vibration reduction device switches to the TMD system working state, and the MRD stops working, saving energy and extending its service life. When the power supply module fails and the magnetorheological damper fails, it can only provide support. At this time, the TMD can still provide damping force to reduce the pipe vibration response.

2. The vibration reduction device for pipelines crossing embankments based on hybrid adaptive control of MRD and TMD as described in claim 1, characterized in that, The data processing module (15) and the control module (16) encapsulate and embed the TMD quality block as part of the quality of the TMD quality block.

3. The vibration reduction device for pipelines crossing embankments based on hybrid adaptive control of MRD and TMD as described in claim 1, characterized in that, The pipe clamp includes an upper pipe clamp (1) and a lower pipe clamp (3). The upper pipe clamp (1) and the lower pipe clamp (3) are symmetrical semi-circular structures. The upper pipe clamp (1) and the lower pipe clamp (3) have horizontal flanges extending outward on both sides. Corresponding screw holes are provided on the flanges. Nuts (2) are inserted into the screw holes to lock the upper pipe clamp (1) and the lower pipe clamp (3). The lower pipe clamp (3) connects the upper ends of the TMD and the MRD.

4. The vibration reduction device for pipelines crossing embankments based on hybrid adaptive control of MRD and TMD as described in claim 1, characterized in that, A washer (10) is fixed on the piston rod (5), and a coil (9) is installed on the upper side of the washer (10). The position of the coil (9) is fixed by the washer (10).

5. The vibration reduction device for pipelines crossing embankments based on hybrid adaptive control of MRD and TMD as described in claim 1, characterized in that, The hollow rubber ring (20) is made of corrugated rubber tube. The corrugated rubber tube is wrapped around the outside of the parallel TMD and MRD. The upper end of the corrugated rubber tube is provided with an arc-shaped structure matching the pipe. The corrugated rubber tube is placed between the pipe and the ground to encapsulate the entire vibration reduction device of the through-dam pipe.

6. The vibration reduction device for pipelines crossing embankments based on hybrid adaptive control of MRD and TMD as described in claim 2, characterized in that, The TMD mass block, which is equipped with a data processing module (15) and a control module (16), is wrapped with waterproof and antistatic material to protect the data processing module (15) and the control module (16) from external factors.

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