CN113983108A - Magnetorheological self-tuning vibration absorber containing three-degree-of-freedom energy trap - Google Patents
Magnetorheological self-tuning vibration absorber containing three-degree-of-freedom energy trap Download PDFInfo
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- CN113983108A CN113983108A CN202110877671.6A CN202110877671A CN113983108A CN 113983108 A CN113983108 A CN 113983108A CN 202110877671 A CN202110877671 A CN 202110877671A CN 113983108 A CN113983108 A CN 113983108A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/002—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion characterised by the control method or circuitry
Abstract
The invention discloses a magnetorheological self-tuning vibration absorber with a three-degree-of-freedom energy trap, which comprises an acceleration sensor, an electronic control unit, a driving module and a vibration absorber, wherein the acceleration sensor senses the vibration acceleration of a flow transmission pipeline and transmits the vibration acceleration to the electronic control unit as a vibration signal of closed-loop control; the electronic control unit is used for comparing a vibration signal provided by the acceleration sensor with a preset amplitude value according to the rotating speed value of the pump to obtain an error signal, and generating and outputting a control signal; the driving module outputs a driving signal with certain amplitude and frequency according to the received control signal; the vibration absorber is arranged on the flow pipeline and used for receiving the driving signal and generating electromagnetic damping to counteract the exciting force transmitted to the flow pipeline by the pump. The invention controls the vibration absorber to apply electromagnetic damping to offset the exciting force transmitted by the motor by sensing the vibration response of the pump in real time, and has the advantages of obvious vibration reduction effect, low cost, small volume and flexible use.
Description
Technical Field
The invention belongs to a vibration absorber in the technical field of fluid transmission, and particularly relates to a magnetorheological self-tuned vibration absorber with an energy trap with three degrees of freedom.
Background
Fluid transmission is a transmission mode which uses fluid as a working medium to carry out energy conversion, transmission and control. Because of the unique superiority of fluid transmission, the fluid transmission is widely applied and becomes an important basic technology which cannot be replaced in the process of industrial, agricultural, national defense and scientific technology modernization. For example, in a hydraulic system, all components and accessories are connected by hydraulic lines and pipe joints, hydraulic medium is conveyed from a hydraulic pump to each actuator, and then is returned from the actuator to a tank to form a closed circuit, so that a complete hydraulic system is formed. The vibration characteristics and control problems of the fluid transmission pipeline are important issues to be solved in recent decades because the instability of the fluid transmission pipeline which often occurs under these conditions can bring catastrophic damage to the operation of the system, and the high decibel noise caused by the flutter or chaotic motion thereof is also extremely harmful 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 semi-active control technology and the NES passive control technology are combined, the magnetic field environment of the magnetic liquid is subjected to feedback control through the vibration characteristics, variable damping is generated, the vibration energy absorbed by the NES-magnetorheological dynamic vibration absorber from the hydraulic pipeline is consumed, and the semi-active vibration control of the combination of the passive vibration and the active vibration is realized.
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 invention aims to provide a magnetorheological self-tuning vibration absorber with a three-degree-of-freedom energy trap, which realizes semi-active reconstruction of a nonlinear energy trap based on the second suspension characteristic of magnetic liquid, can change the magnetic field environment of the magnetic liquid in real time according to the response of a structure to external disturbance and generates variable damping. Can be used as semi-active control to be widely applied to vibration absorption and vibration reduction in the mechanical engineering vibration field.
The technical scheme is as follows: the magnetorheological self-tuned vibration absorber with the three-degree-of-freedom energy trap comprises a vibration attenuation system and a control system, wherein the vibration attenuation system comprises
Three areSix vibration reduction units in the direction of the moving freedom degree are structurally composed of a shell, a moving mass and a stator; the measurement and control system comprises a displacement sensor, a DSP controller and a current driver.
The control system is integrated with a processor module, a digital-to-analog conversion module, a driver module and an acceleration sensor. The processor module analyzes and processes the acceleration signal of the acceleration sensor and outputs a digital control signal, the digital-to-analog conversion module converts the digital control signal output by the processor into an analog signal for controlling the driver module, and the driver module adjusts the current of the excitation coil according to a signal instruction of the processor module.
Further, the generating of the control signal specifically includes: the vibration signal is transmitted as a feedback signal to the electronic control unit.
Further, the acceleration sensor is installed at the power source of the hydraulic system and used for sensing a vibration signal at the power source and transmitting the vibration signal to the electronic control unit as a feedback signal.
Determining the primary order frequency of the motor vibration according to the obtained motor rotating speed value;
carrying out band-pass filtering on the received vibration signal according to the vibration major order frequency, and reserving the vibration signal frequency component near the vibration major order;
and judging the vibration of the received primary frequency component, namely when the vibration of the filtered vibration signal near the primary frequency exceeds a preset amplitude value, starting the semi-active control device to work and generating the control signal.
Furthermore, the driving module is used for receiving the control signal output by the electronic control unit, applying a certain gain to the control signal, generating an alternating current with a certain amplitude and frequency as a driving signal to act on the vibration absorber, and generating an electromagnetic damping effect.
A magneto-rheological self-tuning vibration absorber with a three-degree-of-freedom energy trap comprises an acceleration sensor, an electronic control unit, a driving module and a vibration absorber, wherein the acceleration sensor senses the vibration acceleration of a pump and transmits the vibration acceleration to the electronic control unit as a vibration signal of closed-loop control; the electronic control unit is used for comparing a vibration signal provided by the acceleration sensor with a preset amplitude value according to the rotating speed value of the motor to obtain an error signal, and generating and outputting a control signal; the driving module outputs a driving signal with certain amplitude and frequency according to the received control signal; the vibration absorber is arranged on the flow transmission pipeline and used for receiving alternating current with certain amplitude and frequency output by the driving module and acting the alternating current as a driving signal on the vibration absorber to generate electromagnetic damping effect for active vibration control.
The acceleration sensor is arranged on the outer wall of the flow transmission pipeline and used for sensing the vibration signal of the flow transmission pipeline and transmitting the vibration signal to the electronic control unit as a feedback signal.
The generating of the control signal specifically includes:
determining the primary order frequency of the pump vibration according to the obtained pump rotating speed value;
carrying out band-pass filtering on the received vibration signal according to the vibration major order frequency, and reserving the vibration signal frequency component near the vibration major order;
and judging the vibration of the received primary frequency component, namely when the vibration of the filtered vibration signal near the primary frequency exceeds a preset amplitude value, starting the semi-active control device to work and generating the control signal.
The driving module is used for receiving the control signal output by the electronic control unit, applying gain to the control signal and generating alternating current with certain amplitude and frequency as a driving signal to act on the vibration absorber.
The working principle of the 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 suspension force and the radial suspension force 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, meanwhile, 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 vibration damping system comprises
Six vibration reduction units in three movement freedom directions are structurally composed of a shell, a movable mass and a stator. The movable mass is in clearance fit with the guide assembly and slides along the guide shaft to consume vibration energy. And threads are processed at two ends of the guide assembly and are connected with the two end covers by virtue of threads. The stator is arranged and wound with copper coils from top to bottom in a sparse-to-dense distribution mode to form a gradient magnetic field, and two ends of the gradient magnetic field are in threaded connection with the end covers. Radiating holes are uniformly distributed around the shell and are in threaded connection with the upper end cover and the lower end cover.
The dynamic mass comprises an upper end nut, a permanent magnet ring, a magnetic conduction block, a permanent magnet ring retainer, a lower end nut and micro-nano magnetic composite liquid. The upper end nut and the lower end nut are mainly used for connecting the permanent magnet ring and the magnetic conduction block so as to fix the permanent magnet ring on the permanent magnet ring holder. The permanent magnet ring retainer is made of magnetic conductive materials, the inner hole of the permanent magnet ring retainer and the guide shaft form static pressure support, the friction force of a contact surface can be reduced by the rolling friction effect 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, and the sensitivity of the dynamic mass to vibration absorption is improved.
The stator comprises a coil retainer, a coil winding, a copper coil and a coil winding groove. The coil winding is composed 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 top to bottom by the waist drum-shaped coil retainer from sparse to dense to form electromagnetic gradient distribution. The coil windings are placed in the coil winding slots. The stator is connected with the upper end cover and the lower end cover through bolts.
The 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, so that leakage of the micro-nano magnetic composite liquid is prevented. Radiating holes are uniformly distributed around the cylindrical shell to realize uniform dispersion of vibration heat energy. The shell of the vibration absorber 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 leakage of the micro-nano magnetic composite liquid is prevented. 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 an upper limit block, a guide shaft, a lower limit block and a lubricating groove. The guide shaft passes through the permanent magnet ring retainer, and the guide shaft and the permanent magnet ring retainer form a moving pair structure. The two ends of the guide shaft are connected with the upper limiting block, the lower limiting block, the upper end cover and the lower end cover by threads. The guide shaft is made of a non-magnetic conductive material, stainless steel (such as 304, 304L, 316L and the like) is adopted in the invention, the outer surface of the guide shaft is designed with a lubricating groove, the structure of the lubricating groove is an arc groove and a spiral groove, but the guide shaft is not limited to the two structures, 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, the outer surface of the guide shaft is required to have good surface roughness, and the guide shaft is in clearance fit with the permanent magnet ring retainer.
According to the embodiment of the invention, the magnetorheological self-tuning damping pipe clamp containing the three-degree-of-freedom energy trap has the following beneficial effects for the related technology:
(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 three-degree-of-freedom energy trap magnetic liquid damping pipe clamp can efficiently capture the vibration energy of a main body structure and transfer the vibration energy to the main body structure, the energy dissipation efficiency is high, the mechanical energy of 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.
(3) At present, most of nonlinear energy trap devices designed based on a targeted energy transfer principle adopt passive control, and the nonlinear energy trap device based on the suspension characteristic of magnetic liquid integrates a power supply module, an embedded controller and a current driver into a pipe clamp, can further adjust the damping size according to the main structure characteristic to realize active control, has semi-active control combining passive control and active control, overcomes the defect that the passive control cannot be time-varying, and can still work as a passive vibration damping device due to the fact that the suspension characteristic of the magnetic liquid has nonlinear rigidity and damping under the condition of no external energy supply, so that the problem of high energy consumption of the active control is solved.
(4) The invention realizes the high integration of the magneto-rheological technology, the vibration absorber and the embedded control system, utilizes the characteristic that the damping of the magneto-rheological dynamic vibration absorber is continuously adjustable, and adjusts the damping force of the magnetic liquid vibration absorber to inhibit the vibration of a pipeline by changing the current magnitude, thereby overcoming the defects of fixed damping and rigidity, poor adaptability and durability and the like of the traditional passive vibration damping device.
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 magnetorheological self-tuned vibration absorber with an energy trap in three degrees of freedom according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a magnetorheological self-tuned vibration absorber with three-degree-of-freedom energy traps according to an embodiment of the invention.
FIG. 3 is a schematic diagram of the operation of a magnetorheological self-tuned absorber with three-degree-of-freedom energy trap.
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.
Figure 7 is a schematic view of the structure of a vibration absorber housing according to an embodiment of the invention.
Figure 8 is a schematic diagram of a mechanical model of a vibration absorber according to an embodiment of the invention.
Reference numerals:
a magneto-rheological self-tuning vibration absorber and vibration absorption unit 10 with three-degree-of-freedom energy trap,
wherein: 1. a guide assembly; 1-1, an upper limit block; 1-2, a guide shaft; 1-3 lower limit blocks; 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.
The magnetorheological self-tuned vibration absorber vibration absorbing unit 10 with the three-degree-of-freedom energy trap according to the embodiment of the invention is described in detail with reference to fig. 1 to 6. The magnetorheological self-tuning vibration absorber vibration absorption unit 10 containing the three-degree-of-freedom energy trap is a most promising vibration control device for a fluid transmission pipeline, 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 six vibration absorbers 100 are arranged in the x, y, z, -x, -y, -z directions 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 hydraulic pipeline 100-2 through bolts 100-3.
As shown in fig. 3, the implementation principle of the present embodiment includes the following steps:
sensing the vibration of the fluid delivery pipeline: the acceleration sensor is arranged on the outer wall surface of the hydraulic pipeline, senses the vibration acceleration response of the flow transmission pipeline and feeds the vibration acceleration response back to the electronic control unit as a vibration signal;
primary order frequency generation: the electronic control unit receives a pump rotating speed signal in real time to determine the primary vibration frequency of the pump vibration;
and (3) band-pass filtering treatment: filtering the received vibration signal transmitted by the acceleration sensor according to the primary vibration frequency, and reserving the frequency component of the vibration signal near the primary frequency;
an error judgment step: when the amplitude of the filtered vibration signal near the primary order frequency exceeds a preset amplitude value, judging that the active control system works;
control signal generation: determining a control signal for inhibiting the vibration of the flow transmission pipeline according to the error judgment;
drive signal generation: according to the control signal, the driving module applies a certain gain to generate a driving signal;
generation of driving electromagnetic force: the vibration absorber receives the driving signal, adjusts the current of the excitation coil, changes the magnetic field environment of the vibration absorption unit 10 of the vibration absorber, and controls the shearing force inside the micro-nano magnetic composite liquid 2-6, the friction force between the dynamic mass 2 and the micro-nano magnetic composite liquid 2-6, and the friction force between the micro-nano magnetic composite liquid 2-6 and the stator 3, so that the mechanical energy of vibration is converted into heat energy, and the vibration absorption effect with adjustable damping is realized.
In summary, the magnetorheological self-tuned vibration absorber device with the three-degree-of-freedom energy trap of the embodiment includes an acceleration sensor, an electronic control unit, a driving module, and a vibration absorber. The semi-active vibration control logic of the present embodiment includes: a diagnosis step, namely judging the error vibration level according to the hydraulic pump vibration signal; and a control step, wherein the judgment signal of the diagnosis step is received, and an instruction acting on the vibration absorber is sent, so that the vibration absorber generates an electromagnetic driving force for controlling the magnetic adhesion effect of the micro-nano magnetic composite liquid, and the vibration semi-active control with controllable damping is realized.
As shown in FIG. 4, 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 limit block 1-1, the lower limit block 1-3, the left end cover 4-1 and the right 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. 5, the moving 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 right end nut 2-5 and a micro-nano magnetic composite liquid 2-6. The left 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 to be 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. 6, 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. 7, the vibration absorber casing 4 comprises a left end cover 4-1, a coil lead inlet 4-2, a cylindrical casing 4-3, a heat dissipation hole 4-4, a right 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.
Claims (10)
1. A magnetorheological self-tuning vibration absorber containing three-degree-of-freedom energy trap is characterized in that: the vibration control system comprises an acceleration sensor, an electronic control unit, a driving module and a vibration absorber, wherein the acceleration sensor senses the vibration acceleration of the pump and transmits the vibration acceleration to the electronic control unit as a vibration signal of closed-loop control; the electronic control unit is used for comparing a vibration signal provided by the acceleration sensor with a preset amplitude value according to the rotating speed value of the motor to obtain an error signal, and generating and outputting a control signal; the driving module outputs a driving signal with certain amplitude and frequency according to the received control signal; the vibration absorber is arranged on the flow transmission pipeline and used for receiving alternating current with certain amplitude and frequency output by the driving module and acting the alternating current as a driving signal on the vibration absorber to generate electromagnetic damping effect for active vibration control; the vibration damping system comprises
The six magneto-rheological self-tuning vibration absorbers in the three movement freedom directions are structurally composed of a shell, a dynamic mass and a stator.
2. The magnetorheological self-tuned absorber with the three-degree-of-freedom energy trap according to claim 1, wherein: the acceleration sensor is arranged on the outer wall of the flow transmission pipeline and used for sensing the vibration signal of the flow transmission pipeline and transmitting the vibration signal to the electronic control unit as a feedback signal.
3. The magnetorheological self-tuned absorber with the three-degree-of-freedom energy trap as claimed in claim 2, wherein: the generating of the control signal specifically includes:
determining the primary order frequency of the pump vibration according to the obtained pump rotating speed value;
carrying out band-pass filtering on the received vibration signal according to the vibration major order frequency, and reserving the vibration signal frequency component near the vibration major order;
and judging the vibration of the received primary frequency component, namely when the vibration of the filtered vibration signal near the primary frequency exceeds a preset amplitude value, starting the semi-active control device to work and generating the control signal.
4. The magnetorheological self-tuned absorber with the three-degree-of-freedom energy trap according to claim 1, wherein: the driving module is used for receiving the control signal output by the electronic control unit, applying gain to the control signal and generating alternating current with certain amplitude and frequency as a driving signal to act on the vibration absorber.
5. The magnetorheological self-tuned absorber with the three-degree-of-freedom energy trap according to claim 1, wherein: the working principle of the 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 generates 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.
6. The magnetorheological self-tuned absorber with the three-degree-of-freedom energy trap according to claim 1, wherein: 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; threads are processed at two ends of the guide assembly and are connected with the two end covers through the threads; radiating holes are uniformly distributed around the shell and are in threaded connection with the upper end cover and the lower end cover.
7. The magnetorheological self-tuned absorber with the three-degree-of-freedom energy trap according to claim 6, wherein: the dynamic mass comprises an upper end nut, a permanent magnet ring, a magnetic conduction block, a permanent magnet ring retainer, a lower end nut and micro-nano magnetic composite liquid; the upper end nut and the lower end nut are used for connecting the permanent magnet ring and the magnetic conduction block and fixing 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, magnetic particle components in the micro-nano magnetic composite liquid material form a rolling friction effect between the inner hole of the permanent magnet ring retainer and the guide shaft to reduce the friction force of a contact surface and improve the sensitivity of dynamic mass to vibration absorption.
8. The magnetorheological self-tuned absorber with the three-degree-of-freedom energy trap according to claim 6, wherein: the stator comprises a coil retainer, a coil winding, a copper coil and a coil winding groove; the coil winding is composed 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 top to bottom by the waist drum-shaped coil retainer from sparse to dense to form electromagnetic gradient distribution; the coil winding is placed in the coil winding groove; the stator is connected with the upper end cover and the lower end cover through bolts.
9. The magnetorheological self-tuned absorber with the three-degree-of-freedom energy trap according to claim 6, wherein: the 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, 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, 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.
10. The magnetorheological self-tuned absorber with the three-degree-of-freedom energy trap according to claim 6, wherein: the guide assembly comprises an upper limit block, a guide shaft, a lower limit block and a lubricating groove; the guide shaft penetrates through the permanent magnet ring retainer, and the guide shaft and the permanent magnet ring retainer form a moving pair structure; two ends of the guide shaft are connected with the upper limiting block, the lower limiting block, the upper end cover and the lower end cover by threads; the guide shaft is made of non-magnetic-conductive material and is made of stainless steel.
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| CN114838233A (en) * | 2022-05-12 | 2022-08-02 | 西北工业大学 | Annular dynamic vibration absorption device applied to high-pressure pipeline |
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