CN114060451B - Nonlinear-magnetorheological self-tuning vibration absorber - Google Patents

Nonlinear-magnetorheological self-tuning vibration absorber Download PDF

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CN114060451B
CN114060451B CN202110877674.XA CN202110877674A CN114060451B CN 114060451 B CN114060451 B CN 114060451B CN 202110877674 A CN202110877674 A CN 202110877674A CN 114060451 B CN114060451 B CN 114060451B
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vibration
signal
magnetic
nonlinear
magnetorheological
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CN114060451A (en
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聂松林
恭飞
纪辉
宁冬晶
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Beijing University of Technology
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Beijing University of Technology
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/008—Reduction of noise or vibration
    • 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
    • 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
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/04—Frequency effects
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/0005—Attachment, e.g. to facilitate mounting onto confer adjustability
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/0052—Physically guiding or influencing
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/08—Sensor arrangement
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/18—Control arrangements
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/30—Sealing arrangements

Abstract

The invention discloses a nonlinear-magnetorheological self-tuning vibration absorber 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 hydraulic 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 front end cover of the hydraulic pump and used for receiving the driving signal and generating electromagnetic damping to counteract the exciting force transmitted to the hydraulic pump by the motor. 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 hydraulic pump in real time, and has the advantages of obvious vibration reduction effect, low cost, small volume and flexible use.

Description

Nonlinear-magnetorheological self-tuning vibration absorber
Technical Field
The invention belongs to a vibration damping and energy dissipation device in the technical field of structural vibration, and particularly relates to a nonlinear-magnetorheological self-tuned vibration absorber.
Background
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 transfer, high reliability, strong robustness and the like, can effectively make up for the defects of TMD in the field of Nonlinear vibration, but the conventional NES is passively controlled and cannot be timely adjusted according to the characteristics of external excitation and the change of the vibration characteristic of the structure, and has certain limitation. Therefore, the invention combines the semi-active control technology and the NES passive control technology, performs feedback control on the magnetic field environment of the magnetic liquid through the vibration characteristics, generates variable damping, consumes the vibration energy absorbed by the NES-magnetorheological dynamic vibration absorber from the hydraulic pipeline, and realizes the mixed vibration control of passive and semi-active combination.
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 nonlinear-magnetorheological self-tuned vibration absorber, which realizes the 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. The vibration absorption and damping device can be widely applied to the vibration absorption and damping field of the hydraulic system as semi-active control.
The technical scheme is as follows: the nonlinear-magnetorheological self-tuned vibration absorber comprises a vibration reduction system and a control system, wherein the vibration reduction system comprises a shell, a movable mass, a stator and a guide assembly; 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.
The nonlinear-magnetorheological self-tuned vibration absorber according to the embodiment of the invention has the following beneficial effects for the related art:
(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 NES-magnetic liquid dynamic vibration absorber can efficiently capture the vibration energy of a main body structure and transfer the vibration energy to the device, the energy dissipation efficiency is high, the mechanical energy of mechanism vibration can be rapidly 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) Most of the existing nonlinear energy trap devices designed based on the targeted energy transfer principle adopt passive control, and the nonlinear energy trap device based on the magnetic liquid suspension characteristic 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 change time, and simultaneously reduces the problem of high energy consumption of the semi-active control.
(4) The nonlinear-magnetorheological self-tuning vibration absorber can meet the vibration reduction requirements under different working conditions only by modifying a control algorithm, and is low in cost and flexible to use.
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 hydraulic system vibration semi-active control device according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of an implementation of a method for controlling a vibration semi-actively controlled vibration absorber of a hydraulic system according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a nonlinear-magnetorheological self-tuned vibration absorber according to an embodiment of the invention.
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 a dynamic mass structure of a vibration absorber according to an embodiment of the invention.
Figure 6 is a schematic diagram of a configuration of a permanent magnet ring of a vibration absorber according to an embodiment of the present invention.
Figure 7 is a schematic view of the structure of a vibration absorber stator according to an embodiment of the invention
Figure 8 is a schematic view of the structure of a vibration absorber housing according to an embodiment of the invention
Figure 9 is a schematic diagram of a mechanical model of a vibration absorber according to an embodiment of the invention.
Reference numerals:
a self-tuned vibration absorber 10 with nonlinear-magnetorheological characteristics,
wherein: 1. a guide assembly; 1-1, an upper limit block; 1-2, a guide shaft; 1-3, a lower limit block; 1-4, a lubricating groove; 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, and a sealing ring.
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 nonlinear-magnetorheological self-tuned vibration absorber 10 according to an embodiment of the invention is described in detail below with reference to fig. 1 to 9. The nonlinear-magnetorheological self-tuning vibration absorber 10 is a hydraulic system vibration control device with the greatest prospect and has wide application prospect in the field of hydraulic engineering.
With reference to fig. 1, a nonlinear-magnetorheological self-tuned vibration absorber includes an acceleration sensor, an electronic control unit, a driving module and a damping vibration absorbing module. The acceleration sensor senses the vibration acceleration of a power source of the hydraulic system 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 hydraulic pump and used for receiving a driving signal output by the driving module and generating a certain electromagnetic force, controlling the magnetic adhesion effect of the micro-nano composite magnetic liquid, generating an electromagnetic damping effect and achieving the purpose of semi-active vibration control.
Specifically, the acceleration sensor is mounted on the front end cover of the hydraulic pump and used for sensing a vibration signal at the hydraulic pump and transmitting the vibration signal to the electronic control unit as a feedback signal. The driving module is used for receiving the control signal output by the electronic control unit, applying a certain gain to the control signal and generating an alternating current with a certain amplitude and frequency as a driving signal to act on the vibration absorber.
Specifically, the generating of the control signal specifically includes:
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.
Specifically, the electronic control unit of this embodiment receives the motor rotation speed signal synchronously, determines the major-order frequency of the motor vibration, and performs band-pass filtering on the vibration signal transmitted from the acceleration sensor according to the obtained major-order frequency, thereby retaining the vibration signal frequency component near the major-order frequency; the electronic control unit carries out error judgment on the amplitude of the filtered vibration signal near the primary order frequency, if the amplitude exceeds a preset amplitude value, a control instruction is output to the driving module, otherwise, the control instruction is not output; the driving module generates a driving signal to drive the vibration absorber to work according to the received control instruction; the vibration absorber outputs an electromagnetic driving force.
As shown in fig. 3, in the present embodiment, the vibration absorber 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. 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 limiting block 1-1, the lower limiting 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 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 may adopt different structural types according to application requirements, such as a cylindrical shape, a frustum shape, and the like, but is not limited to the above two structures, and those skilled in the art may 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 permanent magnet ring 2-2 is made of permanent magnets (such as NdFeB) and has different specifications of outer diameters, when being installed, the magnetic conductive block 2-3 is installed at the middle part of the permanent magnet ring holder 2-4, then the permanent magnet ring holder is divided into an upper end and a lower end in sequence, the permanent magnet ring 2-2 with a small diameter is sleeved in the permanent magnet ring holder 2-4, the diameters of the different permanent magnet rings 2-2 are increased in sequence and sleeved in the permanent magnet ring holder 2-4, and a magnetic gradient is formed, wherein the upper end and the lower end of the magnetic gradient are gradually reduced.
As shown in fig. 7, 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. 8, 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.
As shown in fig. 2, the implementation principle of the present embodiment includes the following steps:
sensing of hydraulic pump vibration: the acceleration sensor is arranged at the end cover of the hydraulic pump, senses the vibration acceleration response of the hydraulic pump 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 motor rotating speed signal in real time to determine the primary vibration frequency of the motor 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 seat guide rail 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 absorber 10, 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 reduction effect with adjustable damping is realized.
In summary, the nonlinear-magnetorheological self-tuned vibration absorber device of the present 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.
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 (8)

1. A nonlinear-magnetorheological self-tuning vibration absorber 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 hydraulic 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 front end cover of the hydraulic pump and used for receiving alternating current with certain amplitude and frequency output by the driving module and acting on the vibration absorber as a driving signal to generate an electromagnetic damping effect so as to achieve the aim of active vibration control; the vibration absorber comprises a dynamic mass, a stator, a guide component and a shell, wherein the stator is of a hollow structure and is sleeved outside the dynamic mass;
the working principle of the vibration absorber is based on the second suspension characteristic of magnetic liquid, the moving mass is suspended in the micro-nano magnetic composite liquid, the non-linear rigidity is generated by 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 move relatively 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, an electromagnetic field distributed on the stator generates a shearing action on a flowing gap of the magnetic liquid, the magnetic liquid generates a magneto-rheological effect under two working modes, and a damping force opposite to the excitation direction is formed, so that the energy consumption effect is achieved.
2. The nonlinear-magnetorheological self-tuned absorber according to claim 1, wherein: the acceleration sensor is arranged on the hydraulic pump shell and used for sensing the vibration signal of the hydraulic pump and transmitting the vibration signal to the electronic control unit as a feedback signal.
3. The nonlinear-magnetorheological self-tuned absorber according to claim 1, wherein: the generating of the control signal specifically includes:
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 primary order frequency, and reserving the vibration signal frequency component near the vibration primary 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 nonlinear-magnetorheological self-tuned absorber according to claim 1, wherein: the driving module is used for receiving the control signal output by the electronic control unit, applying a certain gain to the control signal and generating an alternating current with a certain amplitude and frequency as a driving signal to act on the vibration absorber.
5. The nonlinear-magnetorheological self-tuned absorber according to claim 1, 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 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, 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, so that the friction force of a contact surface is reduced, and the sensitivity of the dynamic quality to vibration absorption is improved.
6. The nonlinear-magnetorheological self-tuned absorber according to claim 1, 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 field gradient distribution; the coil winding is placed in the coil winding groove; the stator is connected with the shell through bolts.
7. The nonlinear-magnetorheological self-tuned absorber according to claim 1, 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 realize uniform dispersion of vibration heat energy.
8. The nonlinear-magnetorheological self-tuned absorber according to claim 1, 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 to form a sliding pair; two ends of the guide shaft are connected with the upper limiting block, the lower limiting block and the shell by threads; the guide shaft is made of non-magnetic-conductive materials and is made of stainless steel.
CN202110877674.XA 2021-08-01 2021-08-01 Nonlinear-magnetorheological self-tuning vibration absorber Active CN114060451B (en)

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