阅读说明：本技术 一种含非线性能量阱的二维磁性液体吸振器 (Two-dimensional magnetic liquid vibration absorber containing nonlinear energy trap ) 是由 聂松林 恭飞 纪辉 宁冬晶 于 2021-08-01 设计创作，主要内容包括：本发明公开了一种含非线能量阱的二维磁性液体吸振器,包括两个移动自由度方向上的4个减振单元,其结构均由外壳、动质量和定子组成；其中,外壳由左端盖、线圈引线入口、圆柱形外壳、散热孔、右端盖、线圈引线出口、密封圈组成；动质量由左端螺母、永磁环、导磁块、永磁环保持架、右端螺母、微纳磁性复合液组成；定子由线圈保持架、线圈绕组、铜线圈组成；导向组件包括左限位块、导向轴、右限位块、润滑槽。本发明基于磁性液体的第二类悬浮特性,实现非线性能量阱与输流管路的振动靶向能量传递,最终通过磁性液体的粘性耗散输流管道振动能量。(The invention discloses a two-dimensional magnetic liquid vibration absorber containing a non-linear energy trap, which comprises The structure of the 4 vibration reduction units in the two movement freedom directions consists of a shell, a movable mass and a stator; the shell consists of a left end cover, a coil lead inlet, a cylindrical shell, a heat dissipation hole, a right end cover, a coil lead outlet and a sealing ring; the dynamic mass is composed of a left end nut, a permanent magnet ring, a magnetic conduction block, a permanent magnet ring holder, a right end nut and a micro-nano magnetPreparing a sexual composite liquid; the stator consists of a coil retainer, a coil winding and a copper coil; the guide assembly comprises a left limiting block, a guide shaft, a right limiting block and a lubricating groove. The invention realizes the vibration target energy transfer of the nonlinear energy trap and the flow transmission pipeline based on the second suspension characteristic of the magnetic liquid, and finally dissipates the vibration energy of the flow transmission pipeline through the viscosity of the magnetic liquid.)

1. A two-dimensional magnetic liquid vibration absorber containing a nonlinear energy trap is characterized in that: comprises that 4 vibration damping units in the direction of two freedom degrees of movement, wherein each vibration damping unit is composed of a shell, a dynamic mass, a stator and a guide assembly; threads are machined at two ends of the guide assembly; the movable mass is in clearance fit with the guide assembly and slides along the guide shaft to consume vibration energy; the stator is arranged and wound with copper coils from top to bottom in a sparse-to-dense distribution manner to form a gradientThe two ends of the magnetic field are in threaded connection with the end covers; radiating holes are uniformly distributed around the shell.

2. The two-dimensional magnetic liquid absorber with nonlinear energy traps of claim 1, wherein: the two-dimensional magnetic liquid vibration absorber is based on the second suspension characteristic of magnetic liquid, namely, the dynamic mass can be automatically suspended in the micro-nano magnetic composite liquid, the non-linear rigidity is generated by the axial and radial suspension forces generated by the magnetic liquid under the action of a non-uniform magnetic field, when the external excitation induces the starting mass to relatively move along the guide assembly, unidirectional targeted energy transfer is generated, then the absorbed energy causes the magnetic liquid in the vibration absorber to be extruded, the electromagnetic products distributed on the stator generate a shearing action on the flowing gap of the magnetic liquid, and the magnetic liquid is caused to generate a magneto-rheological effect under two working modes to form a damping force opposite to the excitation direction, so that the energy consumption effect is achieved.

3. The two-dimensional magnetic liquid absorber with nonlinear energy traps of claim 1, wherein: the dynamic mass comprises a left end nut, a permanent magnet ring, a magnetic conduction block, a permanent magnet ring retainer, a right end nut and micro-nano magnetic composite liquid; the left end nut and the right end nut connect the permanent magnet ring and the magnetic conduction block to fix the permanent magnet ring on the permanent magnet ring holder; the permanent magnet ring retainer is made of magnetic conductive materials, an inner hole of the permanent magnet ring retainer and the guide shaft form static pressure support, and a rolling friction effect is formed between the inner hole of the permanent magnet ring retainer and the guide shaft due to magnetic particle components in the micro-nano magnetic composite liquid material; the adopted micro-nano magnetic composite liquid is prepared from magnetic particles of carbonyl iron powder and magnetic Fe₃O₄The base carrier liquid RO reverse osmosis membrane treated water consists of dispersing agent, wherein the dispersing agent comprises SLS, CTMHB, SDBS, CMC and PEG.

4. The two-dimensional magnetic liquid absorber with nonlinear energy traps of claim 1, wherein: the stator comprises a coil winding, and the coil winding consists of a copper coil and a coil retainer; the coil retainer is of a waist drum-shaped structure, and a coil winding groove is processed on the surface of the coil retainer; the coil winding slots are distributed and arranged from sparse to dense in sequence by a waist drum-shaped coil retainer to form electromagnetic gradient distribution; the copper coil is placed in the coil winding slot.

5. The two-dimensional magnetic liquid absorber with nonlinear energy traps of claim 1, wherein: the shell comprises a left end cover, a coil lead inlet, a cylindrical shell, a heat dissipation hole, a right end cover, a coil lead outlet and a sealing ring; the left end cover and the right end cover are sealed by sealing rings, so that the micro-nano magnetic composite liquid is prevented from leaking; radiating holes are uniformly distributed around the cylindrical shell to uniformly disperse vibration heat energy; the vibration absorber shell comprises an upper end cover, a coil lead inlet, a cylindrical shell, a heat dissipation hole, a lower end cover, a coil lead outlet and a sealing ring; the upper end cover and the lower end cover are sealed by sealing rings and are in interference fit, so that the micro-nano magnetic composite liquid is prevented from leaking; radiating holes are uniformly distributed around the cylindrical shell to uniformly disperse vibration heat energy, and the upper end and the lower end of the cylindrical shell are connected with the upper end cover and the lower end cover through threads.

6. The two-dimensional magnetic liquid absorber with nonlinear energy traps of claim 1, wherein: the guide assembly comprises a left limiting block, a guide shaft, a right limiting block and a lubricating groove; the guide shaft passes through the permanent magnet ring retainer on the movable mass to form a moving pair structure; two ends of the guide shaft are in threaded connection with the left limiting block, the right limiting block, the left end cover and the right end cover; the guide shaft is made of non-magnetic-conductive materials and is made of stainless steel, and a lubricating groove is designed on the outer surface of the guide shaft.

7. The two-dimensional magnetic liquid absorber with nonlinear energy traps of claim 6, wherein: the lubricating grooves are arc grooves and spiral grooves; the guide shaft is in clearance fit with the permanent magnet ring retainer.

Technical Field

The invention belongs to a self-tuning vibration absorber in the technical field of fluid transmission, and particularly relates to a two-dimensional magnetic liquid vibration absorber containing a non-linear energy trap.

Background

The fluid transmission technology is a technology which takes fluid as a working medium and realizes the transmission and control of information, movement and force energy. In recent years, with the development of mechatronics technology, fluid transmission is in a new development stage by combining with microelectronics and computer technology. For example, in a hydraulic system, due to internal excitation such as pumps, valves, branch pipes and the like and external excitation such as foundation or deck vibration, vibration of a hydraulic pipeline structure and fluid in the pipeline is induced, the vibration of the pipeline structure and the fluid is also coupled with each other to generate fluid-solid coupling (FSI) vibration, so that how to avoid vibration of the pipeline caused by structure, internal flow and fluid-solid coupling effects and chaotic motion induced by factors such as nonlinearity and the like is an important issue to be solved in the engineering field for decades, because the instability of a flow pipeline which often occurs under these conditions can bring catastrophic damage to the operation of the system, and high decibel noise caused by the flutter or chaotic motion also has great harm to the production and living environment.

The energy dissipation and vibration reduction device can be divided into a linear form and a nonlinear form according to different characteristics of the rigidity unit or the damping unit. A Dynamic Vibration Absorber (DVA) widely used in engineering is also called a Tuned Mass Damper (TMD) which is a passive vibration control device with many applications, the Dynamic vibration absorber is designed to have a natural frequency which is the same as or close to the excitation frequency of the main system vibration, the vibration of the system is suppressed by using the resonance principle, and the TMD is used as a linear damper and can only exert a good vibration reduction effect in a specific frequency band, however, the external excitation frequency and the Dynamic characteristics of the main body structure often change with time. At this time, the TMD loses damping efficiency and even aggravates the vibration response of the body structure. The Nonlinear Energy Sink (NES) has the advantages of small additional mass, wide vibration suppression frequency band, capability of finishing directional target Energy transmission, high reliability, strong robustness and the like, and can effectively make up for the defects of TMD in the Nonlinear vibration field. Therefore, the invention realizes the targeted transmission of the vibration energy of the flow transmission pipeline by using the suspension characteristic of the magnetic liquid.

The magnetic liquid is a colloid which exists stably for a long time and consists of base carrier liquid, magnetic particles with micro/nano scale and surfactant coated on the surfaces of the magnetic particles. The second type of suspension characteristic of the magnetic liquid means that the buoyancy to which the magnet is immersed in the magnetic liquid is greater than the archimedes buoyancy, so that the magnetic liquid can suspend the magnet immersed therein, which has a specific gravity greater than that of the magnetic liquid. The magnetic liquid damping vibration absorber based on the second suspension characteristic of the magnetic liquid achieves the damping vibration attenuation effect through friction and collision between the magnetic liquid and the shell, shearing inside the magnetic liquid and friction between the suspension body and the magnetic liquid to dissipate energy.

Disclosure of Invention

The technical problem is as follows: the invention aims to provide a two-dimensional magnetic liquid vibration absorber with a nonlinear energy trap, which is based on the second suspension characteristic of magnetic liquid, realizes the vibration targeted energy transfer of the nonlinear energy trap and a flow transmission pipeline, and finally dissipates the vibration energy of a hydraulic pipeline through the viscosity of the magnetic liquid.

The technical scheme is as follows: according to the embodiment of the invention, the two-dimensional magnetic liquid vibration absorber containing the nonlinear energy trap comprises a vibration reduction systemThe structure of the 4 vibration reduction units in the two movement freedom directions consists of a shell, a movable mass, a stator and a guide component;

the housing includes: left end cap, coil lead wire entry, cylindrical shell, louvre, right-hand member lid, coil lead wire export, sealing washer.

The dynamic mass comprises: the magnetic coupling device comprises a left end nut, a permanent magnetic ring, a magnetic conduction block, a permanent magnetic ring retainer, a right end nut and micro-nano magnetic composite liquid.

The stator includes: coil holder, coil winding, copper coil.

A two-dimensional magnetic liquid vibration absorber with nonlinear energy trap comprises4 vibration damping units in the direction of two freedom degrees of movement, wherein each vibration damping unit is composed of a shell, a dynamic mass, a stator and a guide assembly; threads are machined at two ends of the guide assembly; the movable mass is in clearance fit with the guide assembly and slides along the guide shaft to consume vibration energy; the stator is wound with copper coils in a distributed and distributed manner from top to bottom to form a gradient magnetic field, and two ends of the gradient magnetic field are in threaded connection with the end cover; radiating holes are uniformly distributed around the shell.

The two-dimensional magnetic liquid vibration absorber is based on the second suspension characteristic of magnetic liquid, namely, the dynamic mass can be automatically suspended in the micro-nano magnetic composite liquid, the non-linear rigidity is generated by the axial and radial suspension forces generated by the magnetic liquid under the action of a non-uniform magnetic field, when the external excitation induces the starting mass to relatively move along the guide assembly, unidirectional targeted energy transfer is generated, then the absorbed energy causes the magnetic liquid in the vibration absorber to be extruded, the electromagnetic products distributed on the stator generate a shearing action on the flowing gap of the magnetic liquid, and the magnetic liquid is caused to generate a magneto-rheological effect under two working modes to form a damping force opposite to the excitation direction, so that the energy consumption effect is achieved.

The dynamic mass comprises a left end nut, a permanent magnet ring, a magnetic conduction block, a permanent magnet ring retainer, a right end nut and micro-nano magnetic composite liquid; the left end nut and the right end nut connect the permanent magnet ring and the magnetic conduction block to fix the permanent magnet ring on the permanent magnet ring holder; the permanent magnet ring holder is made of magnetic conductive material, the inner hole of the permanent magnet ring holder and the guide shaft form static pressure support, and magnetic particle components in the micro-nano magnetic composite liquid material are arranged in the inner hole of the permanent magnet ring holder and the guide shaftA rolling friction effect is formed between the two shafts; the adopted micro-nano magnetic composite liquid is prepared from magnetic particles of carbonyl iron powder and magnetic Fe₃O₄The base carrier liquid RO reverse osmosis membrane treated water consists of dispersing agent, wherein the dispersing agent comprises SLS, CTMHB, SDBS, CMC and PEG.

The stator comprises a coil winding, and the coil winding consists of a copper coil and a coil retainer; the coil retainer is of a waist drum-shaped structure, and a coil winding groove is processed on the surface of the coil retainer; the coil winding slots are distributed and arranged from sparse to dense in sequence by a waist drum-shaped coil retainer to form electromagnetic gradient distribution; the copper coil is placed in the coil winding slot.

The shell comprises a left end cover, a coil lead inlet, a cylindrical shell, a heat dissipation hole, a right end cover, a coil lead outlet and a sealing ring; the left end cover and the right end cover are sealed by sealing rings, so that the micro-nano magnetic composite liquid is prevented from leaking; radiating holes are uniformly distributed around the cylindrical shell to uniformly disperse vibration heat energy; the vibration absorber shell comprises an upper end cover, a coil lead inlet, a cylindrical shell, a heat dissipation hole, a lower end cover, a coil lead outlet and a sealing ring; the upper end cover and the lower end cover are sealed by sealing rings and are in interference fit, so that the micro-nano magnetic composite liquid is prevented from leaking; radiating holes are uniformly distributed around the cylindrical shell to uniformly disperse vibration heat energy, and the upper end and the lower end of the cylindrical shell are connected with the upper end cover and the lower end cover through threads.

The guide assembly comprises a left limiting block, a guide shaft, a right limiting block and a lubricating groove; the guide shaft passes through the permanent magnet ring retainer on the movable mass to form a moving pair structure; two ends of the guide shaft are in threaded connection with the left limiting block, the right limiting block, the left end cover and the right end cover; the guide shaft is made of non-magnetic-conductive materials and is made of stainless steel, and a lubricating groove is designed on the outer surface of the guide shaft.

The lubricating grooves are arc grooves and spiral grooves; the guide shaft is in clearance fit with the permanent magnet ring retainer.

The two-dimensional magnetic liquid vibration absorber containing the nonlinear energy trap has the following beneficial effects for the related art according to the embodiment of the invention:

(1) based on the second suspension characteristic of the magnetic liquid, the device can generate the characteristic of targeted energy transfer with a mechanical structure by generating nonlinear rigidity by the axial suspension force and the radial suspension force generated by the magnetic liquid under the action of a non-uniform magnetic field, and the transfer has the characteristics of high transfer speed and one-way (irreversible) property, so that the vibration absorber can efficiently capture the vibration energy of the main body structure and transfer the vibration energy to the vibration absorber, the energy dissipation efficiency is high, the mechanical energy of the mechanism vibration can be quickly converted into the heat energy generated by friction, and the damping vibration reduction effect is good;

(2) the device of the nonlinear energy trap only needs 5% -10% of the main structure, has the advantages of light weight, strong robustness, wide vibration reduction frequency band, simple structure, convenient installation and the like, and has good application prospect in the aspect of nonlinear energy dissipation and vibration reduction.

Moreover, advantages in accordance with additional aspects of the present invention will be set forth in part in the detailed description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic diagram of a vibration absorbing unit of a two-dimensional magnetic liquid vibration absorber including nonlinear energy traps according to an embodiment of the present invention.

Figure 2 is a schematic diagram of a two-dimensional magnetic liquid absorber containing nonlinear energy traps in accordance with an embodiment of the present invention.

Fig. 3 is a working principle diagram of a two-dimensional magnetic liquid vibration absorber containing nonlinear energy traps.

Figure 4 is a schematic view of the structure of a shock absorber guiding assembly according to an embodiment of the present invention.

Figure 5 is a schematic view of the dynamic mass structure of a vibration absorber according to an embodiment of the invention.

Figure 6 is a schematic view of a vibration absorber stator structure according to an embodiment of the invention.

Reference numerals:

a two-dimensional magnetic liquid absorber vibration absorption unit 10 containing a nonlinear energy trap,

wherein: 1. a guide assembly; 1-1, an upper limit block; 1-2, a guide shaft; 1-3, a lower limit block; 1-4 lubrication grooves; 2. a dynamic mass; 2-1, upper end nut; 2-2, permanent magnetic rings; 2-3, magnetic conduction blocks; 2-4, permanent magnet ring holder; 2-5, lower end nut; 2-6, micro-nano magnetic composite liquid; 3. a stator; 3-1, a coil holder; 3-2, coil winding; 3-3, copper coils; 3-4, coil winding slots; 4. a vibration absorber housing; 4-1, an upper end cover; 4-2, coil lead wire inlet; 4-3, a cylindrical shell; 4-4, heat dissipation holes; 4-5, lower end cover; 4-6, coil lead wire outlet; 4-7, sealing rings; 100. a damping pipe clamp; 100-1, fixing structure; 100-2, hydraulic pipelines; 100-3, bolts.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A two-dimensional magnetic-liquid absorber vibration-absorbing unit 10 including a nonlinear energy trap according to an embodiment of the present invention is described in detail below with reference to fig. 1 to 6. The two-dimensional magnetic liquid vibration absorber vibration absorption unit 10 containing the nonlinear energy trap is a hydraulic pipeline vibration control device with the greatest prospect, and has a wide application prospect in the field of fluid transmission.

As shown in fig. 1, in the present embodiment, the vibration absorber-absorbing unit includes a guide member 1, a dynamic mass 2, a stator 3, and a housing 4. And threads are processed at two ends of the guide assembly 1 and are connected with the two end covers through the threads. The movable mass 2 is in clearance fit with the guide assembly 1 and slides along the guide shaft 2 to consume vibration energy. The stator 3 is wound with copper coils 3-3 in a distributed and distributed from top to bottom to form a gradient magnetic field, and two ends of the gradient magnetic field are in threaded connection with the end cover. Radiating holes are uniformly distributed around the shell 4 and are in threaded connection with the upper end cover 4-1 and the lower end cover 4-5.

As shown in fig. 2, in the present embodiment, the four vibration absorbers 100 are arranged in the x, y, -x, -y, and direction of the hydraulic pipe 100-2 and are screw-coupled to the fixed structure 100-1. The fixed structure 100-1 and the hydraulic pipeline 100-2 are fixedly connected by bolts 100-3.

The vibration absorber 100 is fixedly connected with the fixed structure 100-1 and the fluid transmission pipeline 100-2 through bolts 100-3.

As shown in FIG. 3, the guide assembly 1 comprises an upper limit block 1-1, a guide shaft 1-2, a lower limit block 1-3 and a lubrication groove 1-4. The guide shaft 1-2 penetrates through the permanent magnet ring holder 2-4, and the guide shaft and the permanent magnet ring holder form a moving pair structure. Two ends of the guide shaft 1-2 are connected with the upper limiting block 1-1, the lower limiting block 1-3, the upper end cover 4-1 and the lower end cover 4-5 by screw threads. The guide shaft 1-2 is made of a non-magnetic conductive material, the guide shaft is made of a stainless steel material (such as 304, 304L, 316 and 316L) and the outer surface of the guide shaft is designed with a lubricating groove 1-4, and the structure of the lubricating groove is an arc groove and a spiral groove, but the lubricating groove is not limited to the two structures, and under the condition that the lubricating groove and the spiral groove are not mutually inconsistent, a person skilled in the art can combine and combine the characteristics of different embodiments or examples and different embodiments or examples described in the specification, and the outer surface of the guide shaft is required to have good surface roughness, and the guide shaft 1-2 is in clearance fit with the permanent magnet ring holder 2-4.

As shown in fig. 4, the movable mass 2 is composed of an upper end nut 2-1, a permanent magnet ring 2-2, a magnetic conduction block 2-3, a permanent magnet ring holder 2-4, a lower end nut 2-5 and a micro-nano magnetic composite liquid 2-6. The upper end nut 2-1 and the lower end nut 2-5 are mainly used for connecting the permanent magnet ring 2-2 and the magnetic conduction block 2-3, so that the permanent magnet ring is fixed on the permanent magnet ring holder 2-4. The permanent magnet ring 2-2 adopts different structural types according to application requirements, such as a cylindrical structure, a frustum shape, and the like, but not limited to the above two structures, and those skilled in the art can combine and combine features of different embodiments or examples and different embodiments or examples described in this specification without contradiction. The permanent magnet ring retainer 2-4 is made of magnetic conductivity materials, an inner hole of the permanent magnet ring retainer and the guide shaft 1-2 form static pressure support, magnetic particle components in the micro-nano magnetic composite liquid material form a rolling friction effect between the magnetic particle components and the micro-nano magnetic composite liquid material, so that the friction force of a contact surface can be reduced, and the sensitivity of the dynamic mass 2 to vibration absorption is improved.

As shown in fig. 5, the stator 3 includes a coil holder 3-1, a coil winding 3-2, a copper coil 3-3, and a coil winding slot 3-4. The coil winding 3-2 is composed of a copper coil 3-3 and a coil holder 3-1. The coil holder 3-1 is provided with a coil winding slot 3-3. The coil winding grooves 3-3 are distributed from top to bottom in a distributed manner by a waist drum-shaped coil retainer 3-1, and the coil windings 3-2 are placed in the coil winding grooves 3-3 to form electromagnetic field gradient distribution. The coil winding 3-2 is placed in the coil winding slot 3-3. The stator 3 is connected with the upper end cover 4-1 and the lower end cover 4-5 through bolts.

As shown in FIG. 6, the vibration absorber casing 4 comprises an upper end cover 4-1, a coil lead inlet 4-2, a cylindrical casing 4-3, a heat dissipation hole 4-4, a lower end cover 4-5, a coil lead outlet 4-6 and a sealing ring 4-7. The upper end cover 4-1 and the lower end cover 4-5 are sealed by sealing rings 4-7, and interference fit is adopted to prevent the micro-nano magnetic composite liquid 2-6 from leaking. Radiating holes 4-4 are uniformly distributed around the cylindrical shell 4-3 to realize uniform dispersion of vibration heat energy, and the upper end and the lower end of the cylindrical shell are connected with an upper end cover 4-1 and a lower end cover 4-5 through threads.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.