An eddy current damping type nonlinear vibration absorber

Abstract

The present application relates to a kind of electric eddy current damping nonlinear vibration absorber, for hydraulic pipeline, the device includes cable, pulley bearing, metal mass, cable fixing and adjusting device, mounting frame and magnet, cable is threaded in metal mass and is fixed on mounting frame by being encircled over pulley bearing, mounting frame is fixed on hydraulic pipeline, magnet is nested in both ends of mounting frame;When hydraulic pipeline vibrates, metal mass is subjected to the nonlinear restoring force of cable and relative motion is generated with magnet, electric eddy current is generated in metal mass, acts as damping and realizes the suppression of multidirectional vibration in yOz plane.Compared with prior art, the present application has realized the suppression of multidirectional vibration;Nonlinear stiffness is adjusted by cable fixing and adjusting device, with good controllability and adaptability;The movement of metal mass in x direction is limited by mounting frame, and the vibration in plane and out of plane of hydraulic pipeline is reduced, and the like.

Description

Technical Field

[0001] This invention relates to vibration absorbers, and more particularly to an eddy current damped nonlinear vibration absorber. Background Technology

[0002] Piping is the fundamental equipment for transmitting energy in aircraft hydraulic systems, and its vibration is a potential safety hazard. Vibrations from the aircraft fuselage and engines are transmitted to the hydraulic pipelines through support components. Prolonged exposure to vibration can lead to collisional wear between pipe sections, cracking of pipe connections, and loosening of pipes, connectors, and supports, resulting in vibration failure and reduced service life of the hydraulic pipelines. Passive vibration control technology can be divided into linear and nonlinear vibration reduction. However, in practical engineering, the frequency of external excitation varies, thus limiting the capabilities of linear vibration absorbers. The introduction of nonlinear energy sinks solves this problem. They possess nonlinear stiffness, wide bandwidth, strong adaptability, and no specific resonant frequency, enabling multi-frequency energy dissipation with the hydraulic pipeline system and achieving broadband vibration reduction.

[0003] A search revealed that application publication number CN114412958A discloses a sealed permanent magnet type pipeline electromagnetic damping vibration absorber, specifically comprising: a cylindrical shell, with an upper end cover at the top and a lower end cover at the bottom; a central shaft is provided at the axial position of the cylindrical shell, passing through the upper and lower end covers; the upper end cover is connected to a fixing ring via an upper spring, and the lower end cover is connected to the fixing ring via a lower spring; a permanent magnet is provided on the fixing ring and is sleeved on the central shaft; a coil is wound around the cylindrical shell; the coil is connected to a branch circuit through a wire groove and small holes on the upper and lower end covers to improve energy consumption and heat dissipation; the central shaft is connected to the pipeline, driving the permanent magnet to vibrate up and down, and the permanent magnet moves relative to the coil.

[0004] However, this vibration absorber is installed on only one side of the pipeline during use, which causes the pipeline to be subjected to unbalanced forces and can only suppress vibrations in one direction. Therefore, a broadband vibration isolation device that can suppress vibrations in multiple directions is a technical problem that needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art and provide an eddy current damped nonlinear vibration absorber.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] According to one aspect of the present invention, an eddy current damped nonlinear vibration absorber is provided for a hydraulic pipeline. The vibration absorber includes a steel cable, a pulley bearing, a metal mass block, a steel cable fixing and adjusting device, a mounting frame, and magnets. The steel cable passes through the pulley bearing and through the metal mass block, and is fixed to the mounting frame by the steel cable fixing and adjusting device. The mounting frame is fixed to the hydraulic pipeline, and the magnets are nested at both ends of the mounting frame. When the hydraulic pipeline vibrates radially, the metal mass block is subjected to the nonlinear restoring force of the steel cable, resulting in relative motion with the magnets in the yOz plane. Eddy currents are generated within the metal mass block, which act as dampers during the motion to suppress multi-directional vibrations in the yOz plane.

[0008] As a preferred technical solution, the pulley bearing is located at both ends of the mounting frame, and the mounting frame has protrusions on both sides. The protrusions are located inside the pulley bearing and have steel cable through holes evenly distributed on them.

[0009] As a preferred technical solution, the steel cable passes through a steel cable through hole and is divided into several segments of equal length by a pulley bearing. The steel cable fixing and adjusting device adjusts the steel cable to ensure that the tension of each segment of the steel cable is the same.

[0010] As a preferred technical solution, the metal mass block has steel cable through holes evenly distributed around its circumference, and the steel cable passes through the steel cable through the through holes and is embedded in the mounting frame.

[0011] As a preferred technical solution, the mounting frame and steel cable restrict the movement of the metal mass block in the x-direction.

[0012] As a preferred technical solution, the mounting frame includes an upper mounting frame and a lower mounting frame. The upper mounting frame is provided with a quick-installation slot, and the lower mounting frame is provided with a quick-installation hook. The quick-installation slot and the quick-installation hook are interlocked and locked to fix the mounting frame on the hydraulic pipeline.

[0013] As a preferred technical solution, the magnet consists of two pieces, with opposite magnetic poles installed opposite each other.

[0014] As a preferred technical solution, the steel cable fixing and adjustment device includes a steel cable fixing plate, a steel cable fixing support, a steel cable fixing bolt, and a steel cable adjusting bolt. The steel cable fixing plate and the steel cable fixing support clamp the steel cable by the steel cable fixing bolt, and the steel cable adjusting bolt fixes the steel cable fixing support to the mounting frame.

[0015] As a preferred technical solution, the steel cable adjusting bolt controls the slack and tension of the steel cable to adjust the nonlinear stiffness of the vibration absorber and adapt to the resonance frequency of the hydraulic pipeline under different external excitations; when the steel cable fixing bolt is turned clockwise, the nonlinear stiffness increases, and vice versa.

[0016] As a preferred technical solution, the device is installed on at least one hydraulic pipeline.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1) This invention generates eddy currents by the motion of a metal mass block cutting magnetic field lines. These currents act as dampers during vibration, thereby suppressing micro-amplitude vibrations, effectively absorbing vibration energy, and suppressing vibrations in multiple directions within the yOz plane.

[0019] 2) This invention achieves efficient broadband vibration reduction by using the nonlinear stiffness of the steel cable. The nonlinear stiffness is adjusted by the steel cable fixing and adjustment device, and the tension of each section of the steel cable is controlled to be the same by the steel cable adjustment bolt, which has good controllability and adaptability.

[0020] 3) Compared with the prior art, the present invention is small in size, novel in structure, simple and reliable, and reasonably designed. By restricting the movement of the metal mass block in the x-direction through the installation frame, the vibration of the slender hydraulic pipe in the in-plane and out-of-plane is reduced. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an eddy current damped nonlinear vibration absorber according to the present invention;

[0022] Figure 2 This is an exploded view of an eddy current damped nonlinear vibration absorber according to the present invention.

[0023] Figure 3 This is a schematic diagram showing the arrangement of the magnets and metal mass blocks in this invention;

[0024] Figure 4 This is a schematic diagram of the steel cable fixing and adjusting device of the present invention;

[0025] Figure 5 This is a schematic diagram of the installation of an eddy current damped nonlinear vibration absorber according to the present invention;

[0026] Figure 1 As indicated by the index number:

[0027] 1. Hydraulic pipeline; 2. Steel cable; 4. Metal mass block; 5. Steel cable fixing and adjusting device; 6. Mounting frame; 7. Magnet.

[0028] Figure 2 As indicated by the index number:

[0029] 3. Pulley bearing; 60. Upper mounting frame; 600. Frame quick-installation slot; 61. Lower mounting frame; 610. Frame quick-installation hook; 8. Steel cable through hole.

[0030] Figure 4As indicated by the index number:

[0031] 50. Steel cable fixing plate; 51. Steel cable fixing support; 52. Steel cable fixing bolt; 53. Steel cable adjusting bolt. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] This invention provides an eddy current damped nonlinear vibration absorber for a hydraulic pipeline 1, which reduces the vibration threshold at different excitation frequencies by dissipating energy. The movement of the metal mass block 4 in the y and z directions suppresses the in-plane and out-of-plane lateral vibration of the hydraulic pipeline 1. The invention will now be described in detail with reference to the accompanying drawings.

[0034] like Figure 1 As shown, the present invention is mainly used on a hydraulic pipeline 1, including a hydraulic pipeline 1, a pulley bearing 3, a steel cable 2, a metal mass block 4, a steel cable fixing and adjusting device 5, an installation frame 6, and a magnet 7.

[0035] like Figure 2 and Figure 3 As shown, the mounting frame 6 includes an upper mounting frame 60 and a lower mounting frame 61. The upper mounting frame 60 is provided with a quick-installation slot 600, and the lower mounting frame 61 is provided with a quick-installation hook 610. The quick-installation slot 600 and the quick-installation hook 610 are interlocked and locked to fix the mounting frame 6 to the hydraulic pipeline 1. Pulley bearings 3 are located at both ends of the mounting frame 6. At least four pulley bearings 3 are installed, located at both ends of the upper mounting frame 60 and the lower mounting frame 61, respectively. The mounting frame 6 inside the pulley bearings 3 has protrusions with steel cable through holes 8 evenly distributed around their circumference. The metal mass block 4 also has steel cable through holes 8 evenly distributed around its circumference. The steel cable 2 passes through multiple pulley bearings 3 and through the steel cable through holes 8 of the upper mounting frame 60, the lower mounting frame 61, and the metal mass block 4. It is tightened and fixed between the upper mounting frame 60 and the lower mounting frame 61 by the steel cable fixing and adjusting device 5. The steel cable 2 is divided into several segments of equal length by the pulley bearings 3, and each segment has the same tension. The mounting frame 6 and the steel cable 2 restrict the movement of the metal mass block 4 in the x-direction and suppress the in-plane and out-of-plane vibration of the slender hydraulic pipe 1. Two magnets 7 are nested at both ends of the mounting frame 6, with opposite magnetic poles facing each other.

[0036] like Figure 4As shown, the cable fixing and adjusting device 5 includes a cable fixing plate 50, a cable fixing support 51, a cable fixing bolt 52, and a cable adjusting bolt 53. The cable fixing plate 50 and the cable fixing support 51 clamp the cable 2 through the cable fixing bolt 52. The cable adjusting bolt 53 fixes the cable 2 to the mounting frame 6. The cable 2 is loosened or tightened by turning the cable adjusting bolt 53. Turning the cable fixing bolt 52 clockwise increases the nonlinear stiffness, and vice versa. In this way, the nonlinear stiffness of the eddy current damped nonlinear vibration absorber is adjusted to adapt to the resonance frequency of the hydraulic pipeline 1 under different external excitations, so as to quickly dissipate the vibration energy of the hydraulic pipeline 1 and suppress the vibration of the system.

[0037] like Figure 5 As shown, at least one eddy current damped nonlinear vibration absorber provided by the present invention is installed on the hydraulic pipeline 1, and three are installed in the figure; during installation, multiple vibration absorbers are arranged equidistantly along the axial direction of the hydraulic pipeline 1.

[0038] When an eddy current damped nonlinear vibration absorber is in operation, if the hydraulic pipeline 1 vibrates due to external excitation, the eddy current damped nonlinear vibration absorber vibrates accordingly and drives the steel cable 2 to move. The metal mass block 4 is subjected to the nonlinear restoring force generated by the steel cable 2 and moves along the y and z directions, generating relative motion with the magnet 7. It cuts the magnetic field lines to generate eddy currents, which act as dampers and dissipate vibration energy during the movement, thus suppressing multi-directional vibrations in the yOz plane.

[0039] This invention restricts the movement of the eddy current damped nonlinear vibration absorber in the x-direction by using steel cable 2, so that it can only move in the y and z directions, thereby suppressing the in-plane and out-of-plane vibration of the slender hydraulic pipe 1. Moreover, this invention controls the nonlinear stiffness through the steel cable 2 adjustment device, which has good controllability and adaptability. In addition, this invention generates eddy currents by cutting magnetic field lines through the relative motion of the metal mass block 4 and the magnet 7, so that the metal mass block 4 acts as a damper to dissipate energy during vibration.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An eddy current damped nonlinear vibration absorber for use in hydraulic pipelines (1), characterized in that, The vibration absorber includes a steel cable (2), a pulley bearing (3), a metal mass block (4), a steel cable fixing and adjusting device (5), a mounting frame (6), and a magnet (7). The steel cable (2) passes through the pulley bearing (3) and runs through the metal mass block (4), and is fixed to the mounting frame (6) by the steel cable fixing and adjusting device (5). The mounting frame (6) is fixed to the hydraulic pipeline (1), and the magnet (7) is nested at both ends of the mounting frame (6). When the hydraulic pipeline (1) vibrates radially, the metal mass block (4) is subjected to the nonlinear restoring force of the steel cable (2) and generates relative motion with the magnet (7) in the yOz plane. Eddy currents are generated in the metal mass block (4), which act as dampers during the motion to suppress multi-directional vibrations in the yOz plane. The cable fixing and adjusting device (5) includes a cable fixing plate (50), a cable fixing support (51), a cable fixing bolt (52), and a cable adjusting bolt (53). The cable fixing plate (50) and the cable fixing support (51) clamp the cable (2) by the cable fixing bolt (52), and the cable adjusting bolt (53) fixes the cable fixing support (51) on the mounting frame (6). The steel cable adjusting bolt (53) controls the slack and tension of the steel cable (2) to adjust the nonlinear stiffness of the vibration absorber and adapt to the resonance frequency of the hydraulic pipeline (1) under different external excitations; when the steel cable fixing bolt (52) is turned clockwise, the nonlinear stiffness increases, and vice versa. The metal mass block (4) has steel cable through holes (8) evenly distributed around its circumference, and the steel cable (2) passes through the steel cable through holes (8) and is embedded in the mounting frame (6).

2. The eddy current damped nonlinear vibration absorber according to claim 1, characterized in that, The pulley bearing (3) is located at both ends of the mounting frame (6). The mounting frame (6) has protrusions on both sides. The protrusions are located inside the pulley bearing (3) and have steel cable through holes (8) evenly distributed on them.

3. The eddy current damped nonlinear vibration absorber according to claim 2, characterized in that, The steel cable (2) passes through the steel cable through hole (8) and is divided into several segments of equal length by the pulley bearing (3). The steel cable fixing and adjusting device (5) adjusts the steel cable (2) so that the tension of each segment of the steel cable (2) is the same.

4. The eddy current damped nonlinear vibration absorber according to claim 1, characterized in that, The mounting frame (6) and steel cable (2) restrict the movement of the metal mass block (4) in the x direction.

5. The eddy current damped nonlinear vibration absorber according to claim 1, characterized in that, The mounting frame (6) includes an upper mounting frame (60) and a lower mounting frame (61). The upper mounting frame (60) is provided with a quick-installation slot (600), and the lower mounting frame (61) is provided with a quick-installation hook (610). The quick-installation slot (600) and the quick-installation hook (610) are locked together to fix the mounting frame (6) on the hydraulic pipeline (1).

6. The eddy current damped nonlinear vibration absorber according to claim 1, characterized in that, The magnet (7) consists of two pieces, with opposite magnetic poles installed opposite each other.

7. The eddy current damped nonlinear vibration absorber according to claim 1, characterized in that, At least one of the vibration absorbers is installed on the hydraulic line (1).

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