CN102878237B - Combined intelligent magnetorheological elastomer vibration absorber for ship shafting longitudinal vibration - Google Patents
Combined intelligent magnetorheological elastomer vibration absorber for ship shafting longitudinal vibration Download PDFInfo
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Abstract
本发明提供一种组合式磁流变弹性体船舶轴系纵振智能吸振器，包括固定套在船舶轴系上的上、下基座、以及多个沿所述船舶轴系外周均匀分布的单体吸振器，所述单体吸振器为磁流变弹性体吸振器，所述上、下基座上各设有多个沿圆周分布的安装孔，每个单体吸振器的两端通过所述安装孔与所述上、下基座可拆卸连接。该组合式磁流变弹性体船舶轴系纵振智能吸振器通过上、下基座将多个单体吸振器固定在船舶轴系的外周，同时根据船舶轴系系统的振动情况，通过调整分布于船舶轴系外周的单体吸振器的数量来调整其质量，从而调节该智能吸振器的质量比。
The invention provides a combined magnetorheological elastomer ship shaft longitudinal vibration intelligent shock absorber, which includes upper and lower bases fixedly sleeved on the ship shaft system, and a plurality of single body vibration absorber, the single body vibration absorber is a magneto-rheological elastomer vibration absorber, the upper and lower bases are respectively provided with a plurality of mounting holes distributed along the circumference, and the two ends of each single body vibration absorber pass through the The mounting holes are detachably connected to the upper and lower bases. The combined magnetorheological elastomer ship shafting longitudinal vibration intelligent vibration absorber fixes multiple single vibration absorbers on the outer periphery of the ship shafting system through the upper and lower bases, and at the same time, according to the vibration of the ship shafting system, by adjusting the The quality of the single shock absorber on the outer circumference of the ship shafting system is adjusted to adjust the mass ratio of the intelligent shock absorber.
Description
Technical field
The present invention relates to a kind of intelligent shock-absorbing means on marine shafting, particularly relate to the longitudinal vibration of a kind of combined magnetic magnetorheological elastomer marine shafting intelligent vibration absorber used.
Background technique
In ship's navigation propeller blade rotate in Non-uniform Currents and the fluctuation pressure that produces make Propulsion Systems propeller blade frequently or doubly leaf evoke ship hull vibration frequently.In marine shafting design in the past, owing to lacking efficient shock-absorbing means, the excitation force that propeller cavitation is produced is delivered to hull, the vibration & noise produced both had made the equipment premature damage on ship, also harmful effect is produced to the environment on ship, meanwhile, some are had to the ship of stealthy requirement, produce vibration & noise and have a strong impact on its Stealth Fighter.In the series of measures reducing shafting longitudinal vibration, way between thrust-bearing and pedestal, installs longitudinal shock absorber additional or fastens installation dynamic vibration absorber at axle usually at present, makes itself and axle system form master-slave system.Because marine shafting rigidity and quality are all very large, vibration damper must have very strict performance requirement, thus the complex structure of vibration damper, not easily realize.And bump leveller principle is simple, delicate structure, role is also very effective simultaneously.But traditional bump leveller is only aimed at a certain natural frequency under working environment, and operation point sensitivity is too high, if frequency of okperation transfer occurs or floats comparatively large, the effect of bump leveller will reduce greatly, even plays reaction.
Existing vibration control method can be divided into Passive Control, master control control and semi-active control.Passive Control cost is low, does not also affect the stability of structure, but because it is without the narrow limitation of adaptive ability, is suitable only for arrowband and controls; ACTIVE CONTROL can play good control effects, but ACTIVE CONTROL belongs to power to be controlled, and alms giver will rely on the energy that the external world provides in fact, and energy consumption is very large, simultaneously complex structure, and the cost of investment and maintenance is very high; Semi-active control belongs to state modulator, the parameter of the effect change structure that the change of properties relying on material produces, thus reaches the object of vibration damping.
Magnetic rheology elastic body (MRE) is the new branch of of magnetorheological materials, it is combined by the polymer (rubber) of elastomeric state and ferromagnetic particle, the Young's modulus of this material can change under the excitation of externally-applied magnetic field, ferromagnetic particle forms catenation at magnetic direction, and the reaction time is Millisecond.Based on above-mentioned principle, can be applied in bump leveller by magnetic rheology elastic body, the magnetic field produced by applying electric current controls the shearing rigidity of magnetic rheology elastic body, makes the natural frequency of its natural frequency real-time tracing external excitation, thus suppresses the vibration of main system.
Chinese utility model patent specification CN2842078Y discloses a kind of magnetic flowing deformation elastomer frequency shift type attenuator, comprise power unit, controlling component and sensor, described power unit is made up of parts such as magnetic conductive part, coil, magnetic rheology elastic body, absorbing mass block and pedestals.But this magnetorheological elasticity frequency-shift type bump leveller structure relative complex, and absorbing frequency is limited, if frequency of okperation changes greatly, multiple bump leveller is then needed to combinationally use, control the vibration of each frequency respectively, and the shift frequency scope of each bump leveller is little, produce a lot of incidentally quality, its entirety is very heavy.
Chinese invention patent CN101513924A discloses a kind of magnetorheological elastomer intelligent vibration absorber used for ships, comprise frame, magnetic rheology elastic body, electromagnetic coil and inner core, its structure is relatively simple, but this intelligent vibration absorber used be only applicable to boats and ships main frame or various pump on.In addition, this is intelligent vibration absorber used is provided with four construction bolt holes on its frame, can be connected in a plane, but the outer surface of marine shafting is a cylndrical surface, therefore be difficult to attach it in the vibration control of marine shafting, and the mass ratio of this bump leveller is non-adjustable, using scope has certain narrow limitation, is difficult to be applicable to the various application needing different quality ratio.Meanwhile, for this large quality system of axle system, the physical dimension of single bump leveller and quality should not be excessive, otherwise its dismounting is inconvenient.In addition, existing magnetic rheology elastic body is all prepared according to single rubber base material, often there is magnetic rheology effect and the conflicting shortcoming of mechanical property, and namely magnetic rheology effect is large but mechanical property is poor, as silicone rubber etc.; The unfavorable factors such as good mechanical property but magnetic rheology effect is not good, as natural rubber, polyurethane etc., and then causes tunable band wide not, and damping ratio is larger simultaneously, limit its application area at dynamic vibration absorber.In addition, known by carrying out magnetic simulation to this structure, in this magnetorheological elastomer intelligent vibration absorber used for ships, the magnetic field that electric current produces is extremely uneven in magnetic rheology elastic body, and decay is very fast, effectively can not play the variation rigidity effect of magnetic rheology elastic body.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide the longitudinal vibration of a kind of combined magnetic magnetorheological elastomer marine shafting intelligent vibration absorber used, to overcome in prior art absorber mass than non-adjustable, the defect that can not be arranged in marine shafting.
For achieving the above object, the invention provides the longitudinal vibration of a kind of combined magnetic magnetorheological elastomer marine shafting intelligent vibration absorber used, comprise the upper and lower pedestal of fixed cover on marine shafting and multiple along the equally distributed monomer bump leveller in described marine shafting periphery, described monomer bump leveller is magnetic rheology elastic body bump leveller, described upper and lower pedestal is respectively provided with multiple circumferential mounting hole, and the two ends of each monomer bump leveller are removably connected by described mounting hole and described upper and lower pedestal.
Preferably, described upper and lower pedestal is disc, and described monomer bump leveller is cylindrical.
Further, described monomer bump leveller comprises the absorbing mass block being arranged on outer ring, the inner ring of described absorbing mass block is fixed with magnetic rheology elastic body, the inner ring of described magnetic rheology elastic body is fixed with iron core, described iron core is wound with the first coil, described iron core two ends removably connect with described upper and lower pedestal respectively.
Preferably, described iron core is provided with the alar part that even number extends along iron core radial direction, and described first coil is along iron mandrel to being wrapped on each alar part, and the first coil direction of winding on described adjacent two alar parts is identical, electrical current direction is contrary.
Further, the inside of described absorbing mass block is provided with multiple tracks axial groove, described axial groove is opened on the internal surface of absorbing mass block, be a rolling part between every two axial grooves, alar part on described rolling part and iron core is oppositely arranged, and described rolling part is provided with the second coil be axially wound around along absorbing mass block.
Preferably, described alar part is four, and the outer end of each alar part is an arc shaped surface, and the central angle of described arc shaped surface is 62 ° ~ 70 °.
Further, be also fixed with lining between described magnetic rheology elastic body and iron core, described lining internal surface is fixedly connected with the arc shaped surface of described alar part, and outer surface is fixedly connected with the internal surface of described magnetic rheology elastic body.
Preferably, described iron core two ends are equipped with axial protuberance, and described axial protuberance is provided with screw thread, are fixed on upper and lower pedestal by the axial protuberance of nut by iron core two ends.
Further, the material of described iron core and absorbing mass block is soft magnetic material, and scribbles one deck NULL at the outer wall of described absorbing mass block.
Preferably, many struts are also fixedly connected with between described upper and lower pedestal.
As mentioned above, the combined magnetic magnetorheological elastomer marine shafting longitudinal vibration that the present invention relates to is intelligent vibration absorber used, has following beneficial effect:
This intelligent vibration absorber used periphery by upper and lower pedestal, multiple monomer bump leveller being fixed on marine shafting of combined magnetic magnetorheological elastomer marine shafting longitudinal vibration, simultaneously according to the Vibration Condition of marine shafting system, the quantity being distributed in the monomer bump leveller of marine shafting periphery by adjustment adjusts its quality, thus the mass ratio regulating this intelligent vibration absorber used.
Accompanying drawing explanation
Fig. 1 is the system block diagram that the present invention applies.
Fig. 2 is structural representation of the present invention.
Fig. 3 is the structural representation of upper and lower pedestal in the present invention.
Fig. 4 is the structural representation of monomer bump leveller in the present invention.
Fig. 5 is the plan view of Fig. 4.
Fig. 6 is the schematic diagram of absorbing mass block and core structure in the present invention.
Fig. 7 is the structural representation of iron core in the present invention.
Fig. 8 is the plan view of Fig. 7.
Fig. 9 is the structural representation that in the present invention, iron core is connected with the first coil.
Figure 10 is the schematic diagram of the inner magnetic circuit of monomer bump leveller in the present invention.
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this specification can understand other advantages of the present invention and effect easily.
Notice, structure, ratio, size etc. that this specification institute accompanying drawings illustrates, content all only in order to coordinate specification to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.Simultaneously, quote in this specification as " on ", D score, "left", "right", " centre " and " one " etc. term, also only for ease of understanding of describing, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of the present invention.
As shown in Figure 2, the combined magnetic magnetorheological elastomer marine shafting longitudinal vibration that the present invention relates to is intelligent vibration absorber used, comprise the upper and lower pedestal 2,3 of fixed cover on marine shafting 1 and multiple along the equally distributed monomer bump leveller 4 in described marine shafting 1 periphery, described monomer bump leveller 4 is magnetic rheology elastic body bump leveller, described upper and lower pedestal 2,3 is respectively provided with multiple circumferential mounting hole 21, see Fig. 3, the two ends of each monomer bump leveller 4 are removably connected with described upper and lower pedestal 2,3 by described mounting hole 21.By the upper and lower pedestal 2,3 of fixed cover on marine shafting 1, multiple monomer bump leveller 4 is fixed on the periphery of marine shafting 1, realize the application of monomer bump leveller 4 in marine shafting 1, simultaneously also according to the Vibration Condition of marine shafting 1, the quantity being distributed in the monomer bump leveller 4 of marine shafting 1 periphery by adjustment adjusts its quality, thus the mass ratio regulating this intelligent vibration absorber used, to reach best shock attenuation result.In addition, multiple monomer bump leveller 4 evenly shares the dynamic force in working procedure, while ensureing that the mass ratio of whole system is adjustable, also reduces the requirement of strength of each monomer bump leveller 4.
Further, regulate the intelligent vibration absorber used quality of this combined magnetic magnetorheological elastomer marine shafting longitudinal vibration than time, namely when change is distributed in the number of the monomer bump leveller 4 of marine shafting 1 periphery, when the number of monomer bump leveller 4 is less, rigidity between upper and lower pedestal 2,3 diminishes, and then cause malformation, therefore many struts 5 are also fixedly connected with between described upper and lower pedestal 2,3, see Fig. 2, strut 5 is supported between upper and lower pedestal 2,3, to improve structural entity intensity, prevent malformation.Preferably, in the present embodiment, described upper and lower pedestal 2,3 is disc, and described monomer bump leveller 4 is cylindrical.
Further, see Fig. 4 and Fig. 5, described monomer bump leveller 4 comprises the absorbing mass block 41 being arranged on outer ring, the inner ring of described absorbing mass block 41 is fixed with magnetic rheology elastic body 42, the inner ring of described magnetic rheology elastic body 42 is fixed with iron core 43, described iron core 43 is wound with the first coil 44, sees Fig. 9, described iron core 43 two ends removably connect with described upper and lower pedestal 2,3 respectively.
Preferably, shown in Figure 7 and 8, the core 43 provided with an even number of wings 43 radially extending along the core 431, in this embodiment, the wing portion 431 is four, and each wing the outer end portion 431 are curved surfaces 432 a, the central angle of the arcuate surface 432 is 62 ° ~ 70 °, i.e., the wing portion 431 is ax-shaped cross section.Described first coil 44 is axially wrapped on each alar part 431 along iron core 43, the first coil 44 direction of winding on described adjacent two alar parts 431 is identical, electrical current direction is contrary, or the first coil 44 direction of winding on adjacent two alar parts 431 is contrary, electrical current direction is identical, and then produce the magnetic field be applied on magnetic rheology elastic body 42, and this magnetic field is a radial or similar radial radial magnetic field (namely along the radially-arranged magnetic field of iron core 43), the magnetic-particle of magnetic rheology elastic body 42 inside is arranged in thick chain along magnetic direction under the effect of this radial magnetic field, magnetic rheology elastic body 42 is caused to change macroscopically showing as shear modulus, and then its shearing rigidity is changed, and then change its natural frequency, reach the effect of absorbing.Further, described iron core 43 is soft magnetic material with the material of absorbing mass block 41, and scribbles one deck NULL at the outer wall of described absorbing mass block 41, effectively avoids leakage field phenomenon.
Described iron core 43 and absorbing mass block 41 are all Paramagnetic material, permeability higher (relative permeability is 1000 ~ 2000), and the permeability of magnetic rheology elastic body 42 lower (relative permeability is 3 ~ 10), according to said structure, namely only on iron core 43 around the first coil 44, what then the actual radial radial magnetic field produced was decayed in magnetic rheology elastic body 42 (is quickly about 900mT at the magnetic induction intensity of magnetic rheology elastic body 42 near iron core 43 place, and be just reduced to about 100mT at the magnetic induction intensity that magnetic rheology elastic body 42 presses close to absorbing mass block 41 place), and then cause the rheological properties of magnetic rheology elastic body 42 normally to play, and the rigidity of magnetic rheology elastic body 42 is also reduced by the characteristic of Magnetic control, absorbing frequency band is narrowed.Broaden to make the absorbing frequency band of monomer bump leveller 4, see Fig. 5 and Fig. 6, multiple tracks axial groove 411 is offered in the inside of described absorbing mass block 41, described axial groove 411 is opened on the internal surface of absorbing mass block 41, be a rolling part 412 between every two axial grooves 411, described rolling part 412 is oppositely arranged with the alar part 431 on iron core 43, described rolling part 412 is provided with the second coil 45 be axially wound around along absorbing mass block 41, and the direction of winding of the second coil 45 is identical on each rolling part 412, the electrical current direction of the first coil 44 on electrical current direction and the alar part 431 relative with this rolling part 412 is identical, namely after the first coil 44 and the second coil 45 are energized, the magnetic pole that each alar part 431 and the rolling part 412 relative with this alar part 431 produce is identical, see Figure 10, around iron core 43 and absorbing mass block 41, formation one is radial and along the radially-arranged magnetic field of monomer bump leveller 4.Now, the magnetic field that first coil 44 and the second coil 45 produce makes the magnetic field in magnetic rheology elastic body 42 more even, and the magnetic induction intensity at four alar part 431 places is stronger, reach more than 800mT, for the saturation induction density of magnetic rheology elastic body 42, therefore make the change of the natural frequency of bump leveller reach maximum, finally reach the effect of wideband absorbing.
Preferably, lining 46 is also fixed with between described magnetic rheology elastic body 42 and iron core 43, described lining 46 internal surface is fixedly connected with the arc shaped surface 432 of described alar part 431, outer surface is fixedly connected with the internal surface of described magnetic rheology elastic body 42, described lining 46 is a thin iron cylinder, makes magnetic rheology elastic body 42 tightr with pasting of iron core 43 by this thin iron cylinder.In this enforcement, described absorbing mass block 41 and magnetic rheology elastic body 42, magnetic rheology elastic body 42 are with lining 46, be all fixedly connected with by tackiness agent between lining 46 with iron core 43, and described absorbing mass block 41, magnetic rheology elastic body 42, lining 46 and iron core 43 is concentric structure.
Further, described magnetic rheology elastic body 42 is by carbonyl iron dust, polyurethane-form according to certain mass ratio along fourth mixed rubber, additive, plasticizing agent, antiager, the saturated shear modulus knots modification of magnetic rheology elastic body 42 is finally made to reach 100% ~ 150%, the natural frequency excursion of monomer bump leveller 4 is large, then suppress the Bandwidth vibrated, meanwhile, the antifatigue of magnetic rheology elastic body 42, aging quality resistance have also been obtained lifting.
Preferably, see Fig. 4 and Fig. 7, described iron core 43 two ends are equipped with axial protuberance 433, and described axial protuberance 433 is provided with screw thread, are fixed on upper and lower pedestal 2,3 by the axial protuberance 433 at iron core 43 two ends by nut.Iron core 43 is fixedly connected with marine shafting 1 by upper and lower pedestal 2,3, therefore iron core 43 and marine shafting 1 geo-stationary, therefore the first coil 44 and marine shafting 1 also geo-stationary on iron core 43, ensure the shock attenuation result of monomer bump leveller 4 further.
See Fig. 1, the intelligent vibration absorber used shock absorption system be applied in marine shafting 1 of this combined magnetic magnetorheological elastomer marine shafting longitudinal vibration is comprised signals collecting parts, controlling component, power supply part and power unit, described power unit is the monomer bump leveller 4 of the adjustable parallel connection of several numbers, described signals collecting parts are connected with controlling component, described controlling component is connected with power supply part and controls the size of power supply part output current, and described power supply part is connected with several monomer bump levellers 4.System Working Principle is: the rotating speed being detected marine shafting 1 by signals collecting parts, draws rotational frequency when marine shafting 1 operates, and namely axle frequently; Longitudinal pumping power due to marine shafting 1 is leaf exciting force frequently, then axle is the exciting force frequencies omega of extensional vibration frequently with the product of propeller blade number, and this exciting force frequencies omega is inputed in controlling component, controlling component is according to this exciting force frequencies omega and the controlling method that designs in advance, control power supply part and export to the size of electric current I on the first coil 44, second coil 45, and ensure the size of this output current I with the change of exciting force frequencies omega real-time change; The radial magnetic field that on first coil 44, second coil 45, electrical current I produces puts on magnetic rheology elastic body 42, the magnetic-particle of magnetic rheology elastic body 42 inside will be arranged in thick chain along magnetic direction under the effect of radial magnetic field, magnetic rheology elastic body 42 is caused to change macroscopically showing as shear modulus, its shearing rigidity is changed, and then changes its natural frequency ω
n, thus can the vibrational excitation frequency (ω of tracking axis system
n=ω), in quite wide scope, best shock attenuation result can be reached all the time.
In sum, the present invention relates to that the longitudinal vibration of combined magnetic magnetorheological elastomer marine shafting is intelligent vibration absorber used to have the following advantages:
1.. be directed to the extensional vibration of marine shafting 1, the frequency Applicable scope of bump leveller from tens of Hertz to more than 100 hertz, can be applicable to the exciting force frequency band excursion of marine shafting 1 extensional vibration, also can be applied to other occasions simultaneously.
2.. according to the Vibration Condition of marine shafting 1 system, adjust its quality by the quantity changing monomer bump leveller 4, thus can regulate whole intelligent vibration absorber used mass ratio;
3.. the Vibration Condition of marine shafting 1 can be followed the tracks of, changed the shearing rigidity of monomer bump leveller 4 by the size changing output current, ensure that the natural frequency of monomer bump leveller 4 follows the change of exciting force frequency;
4.. absorbing mass block 41 and iron core 43 inside produce radial radial magnetic field, ensure that magnetic rheology elastic body 42 plays best shearing rigidity performance, decrease the consume in magnetic field simultaneously;
The rigidity of magnetic rheology elastic body 42 is adjustable, and response is fast, good reversibility, not only existing higher magnetic rheology effect, and also have good comprehensive mechanical performance, its damping is less, and shock attenuation result is good, need not encapsulate, good stability etc. simultaneously.
So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (6)
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105508498B (en) * | 2015-12-19 | 2018-01-02 | 东北大学 | A kind of method for suppressing oscillation of rotary machine rotor |
| CN107191529B (en) * | 2017-03-27 | 2019-03-22 | 上海交通大学 | A kind of magnetic rheology elastic body thrust bearing pedestal dynamic vibration absorber and application method |
| CN107606026B (en) * | 2017-08-16 | 2019-08-30 | 洛阳理工学院 | A frequency extension vibration absorber based on intelligent stiffness element and its control method |
| CN108278319A (en) * | 2017-12-01 | 2018-07-13 | 北京理工大学 | A kind of dynamical system broadband magnetic rheology elastic body dynamic tuning bump leveller |
| CN108547908B (en) * | 2018-04-17 | 2019-12-03 | 阜阳知麓信息科技有限公司 | A kind of interior wound MR damper of multi-cylinder cylinder linkage |
| CN112539243A (en) * | 2020-11-24 | 2021-03-23 | 江苏科技大学 | Polar region ship shafting vibration intelligent control device that circles round |
| CN115180110B (en) * | 2022-07-07 | 2024-06-07 | 中国船舶重工集团公司第七一九研究所 | Ship propulsion system and ship |
| CN117167434A (en) * | 2023-11-03 | 2023-12-05 | 哈尔滨工程大学 | Multi-frequency adjustable-frequency dynamic vibration absorber |
| CN117469339B (en) * | 2023-12-28 | 2024-03-08 | 中闽(福清)风电有限公司 | Variable-rigidity variable-damping magnetorheological vibration absorber control method applied to propulsion shaft system |
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| US6752250B2 (en) * | 2001-09-27 | 2004-06-22 | Northrop Grumman Corporation | Shock, vibration and acoustic isolation system |
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