CN107203669A - A kind of Reverse optimization design method of MR damper - Google Patents
A kind of Reverse optimization design method of MR damper Download PDFInfo
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- CN107203669A CN107203669A CN201710411418.5A CN201710411418A CN107203669A CN 107203669 A CN107203669 A CN 107203669A CN 201710411418 A CN201710411418 A CN 201710411418A CN 107203669 A CN107203669 A CN 107203669A
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Abstract
The invention discloses a kind of Reverse optimization design method of MR damper, this method passes through selected required maximum damping force and adjustability coefficients, geometry designs and magnetic Circuit Design are united and carry out Reverse optimization design, until MR damper meets required maximum damping force and adjustability coefficients under relatively small size；Wherein, geometry designs utilize MATLAB simulation softwares computational geometry design object value, and magnetic Circuit Design utilizes ANSYS finite element stimulation magnetic Circuit Design desired values.The Reverse optimization design method of the present invention had both met the precision of hollow magnetic field intensity solution of magnetic Circuit Design, and the interdependence between geometry designs and magnetic Circuit Design is taken into full account again, effectively prevent and the waste of magnetic saturation phenomenon or magnetic circuit material occur too early；This method is workable, and theoretical direction is provided for the design of MR damper, is easy to its engineer applied and popularization.
Description
Technical field
The present invention relates to a kind of Reverse optimization design method of the MR damper available for field of intelligent control.
Background technology
In recent years, China mitigates earthquake and the research of high wind disaster to engineering structure increasingly using vibration control technology
Many, specific technological means is also increasing, and is widely used in Practical Project.Structural vibration control refers to by structure
Control member and control device are set up, what is be passively or actively when structural vibration applies one group of controling power to structure, reduce or press down
The dynamic response of structure processed, with the requirement of the security, usability and comfort level that meet structure.
MR damper is the representative of semi-automatic control device in structural vibration control, with small, the big, sound of exerting oneself that consumes energy
The advantages of answering fast speed, damping force continuously adjustabe, can be achieved preferable vibration control effect.Obviously, easily and effectively magnetorheological
Damper designs method to its make and engineer applied for it is most important.At present, the basic ideas of MR damper are designed
Substantially：It is first depending on damper maximum damping force design damper geometric parameter；Then selected most according in geometry designs
The parameter size that magnetic induction intensity and geometry designs needed for big shear yield strength are determined, magnetic is carried out using ohm's law for magnetic circuit
Design on road.This mentality of designing is although practical, but design process is that geometry designs are separated and independently performed with magnetic Circuit Design
, fail to take into full account between the two interrelated.For problem above, have scholar introduce Optimize magnetic circult magnetic Circuit Design with
Geometry designs combine together, it is proposed that a kind of shearing valve type magneto-rheological damper designs method of simplification；But its magnetic circuit part
It is still that the calculation formula obtained using ohm's law for magnetic circuit is designed, but ferromagnet combining structure is complex, so
Hardly result in the accurate analytic solutions of space magnetic field intensity after being powered.There is scholar precisely to emulate magnetic field using finite element, with maximum resistance
Buddhist nun's power and adjustability coefficients are optimization aim, using multi-objective genetic algorithm, MR damper are optimized design；But its
Object function is to make maximum damping force maximum and make adjustability coefficients maximum, and is typically in given institute in Practical Project Vibration Absorption Designing
Need to carry out reverse link parameter optimization design in the case of maximum damping force and adjustability coefficients so that damper is full under less size
Sufficient design requirement.Therefore innovation must be sought on the basis of existing Design of MR dampers method.
The content of the invention
Goal of the invention：The technical problems to be solved by the invention are to provide a kind of Reverse optimization design of MR damper
Method so that damper disclosure satisfy that given maximum damping force and adjustability coefficients requirement under reduced size.
The content of the invention：In order to solve the above technical problems, the technology used in the present invention means are：
A kind of Reverse optimization design method of MR damper, this method passes through the maximum damping force needed for determination and can
Coefficient is adjusted, geometry designs and magnetic Circuit Design are united and carry out Reverse optimization design, until MR damper is relatively small
Size under meet required maximum damping force and adjustability coefficients；Wherein, geometry designs calculate several using MATLAB simulation softwares
What design object value, magnetic Circuit Design utilizes ANSYS finite element stimulation magnetic Circuit Design desired values.
The inventive method specifically includes following steps：
Step 1, the design object value of MR damper is selected：Maximum damping force U*With adjustability coefficients β0；
Step 2, the maximal rate of damper rod needed for being determined according to actual vibration situationIn conjunction with the magnetic of selection
Rheology liquid and magnetic circuit material determine the corresponding maximum shear yield strength τ in magnetic flow liquid operating pointy, and null field viscosities il；
Step 3, the maximum damping force U determined according to step 1*, calculated according to Machine Design specification and characteristic of material mechanics
Required diameter of piston rod d and outer shell barrel thickness t intensity limit value；
Step 4, the permeance of each material is determined and according to the maximum shear yield strength τ selected in step 2ySearch
Magnetic circuit needs magnetic induction density B at the working clearance0；
Step 5, the diameter of piston rod d determined according to step 3 intensity limit value carries out geometry designs；
Step 6, at the magnetic circuit working clearance that the outer shell barrel thickness t determined according to step 3 intensity limit value and step 4 is determined
Required magnetic induction density B0Carry out magnetic Circuit Design；
Step 7, judge whether the geometric parameter and magnetic circuit parameters of design meet requirement, repeat to walk if being unsatisfactory for requiring
Rapid 5~6, until geometric parameter and magnetic circuit parameters reach minimum dimension and meet the design maximum damping force U determined in step 1*
With adjustability coefficients β0Requirement.
Wherein, in step 5, the design procedure of the geometry designs includes：(1) preliminary selection physical dimension parameter piston is straight
Footpath D, diameter of piston rod d, working clearance width h and piston effective length L；(2) current choosing is calculated using MATLAB simulation softwares
The maximum damping force and adjustability coefficients obtained under the initial parameter taken；(3) numerical value and Jiang (2) obtained and design object value ratio
Compared with if being unsatisfactory for design requirement, selection physical dimension parameter, repeats (1)~(3), the number obtained until simulation calculation again
Untill value meets design requirement；(4) after the numerical value that simulation calculation is obtained meets design requirement, then the initial parameter of setting is judged
Whether can further reduce, if can if choose smaller value repeat step (1)~(4) again, otherwise choose the ginseng of setting
Number is design result.
Wherein, in step 6, the design procedure of the magnetic Circuit Design includes：(1) it is preliminary to choose according to geometry designs result
Determine turn number N, outer shell barrel thickness t, grooving length a and width b；(2) magnetic circuit ANSYS finite element stimulation workplaces are utilized
Average magnetic induction intensity at gap(3) judge whether grooving length a and width b is less than limit value, carried out if meeting next
Step, otherwise re-starts geometry designs and carries out step (1)~(3)；(4) be averaged magnetic strength in judgment step (2) at the working clearance
Answer intensityWhether magnetic induction density B at the selected magnetic circuit working clearance is more than or equal to0, if it is satisfied, then next step is carried out,
Otherwise repeat step (1)~(4)；(5) judge setting initial parameter whether can further reduce, if can if select again
Smaller value repeat step (1)~(5) are taken, the parameter set are otherwise chosen as design result.
Wherein, it is considered to which grooving length a and width b mechanical characteristic requirement, grooving length a limit value takes piston head length
A quarter, grooving width b limit value takes 1/2nd of piston head diameter and diameter of piston rod difference.
Wherein, the concrete analysis process of the ANSYS finite element simulations is：(1) two-dimensional static analysis type, unit are selected
From two-dimentional 8 Node Quadrilateral Element solid element Plane53；(2) piston, cylinder are set up according to the permeance of known materials respectively
The FEM model of cylinder, gap magnetic flow liquid, coil, air and sealing epoxy resin part；(3) boundary line applies outside model
The parallel boundary condition of magnetic flux, grid division；(4) excitation is applied in the form of current density, carrying out static state to the model asks
Solution；(5) enter post processing, check magnetic field strength date, be operated gap location average magnetic induction intensityCalculating.
Wherein, the calculation formula of the maximum damping force and adjustability coefficients is respectively：
FMRD, max=Fτ+Fη+Fp0；
In formula, p0=1.2Mpa.
Compared to prior art, technical solution of the present invention have the advantage that for：
First, the inventive method is set by unified geometry designs and magnetic Circuit Design to MR damper progress Reverse optimization
Meter so that damper disclosure satisfy that given maximum damping force and adjustability coefficients requirement under reduced size；Meanwhile, utilize
Desired value in MATLAB and ANSYS difference simulation calculation geometry designs and magnetic Circuit Design, tentative calculation repeatedly, Integrated comparative is met
It is required that untill, the precision of hollow magnetic field intensity solution of magnetic Circuit Design had so both been met, geometry designs and magnetic are taken into full account again
Interdependence between the design of road, effectively prevent and the waste of magnetic saturation phenomenon or magnetic circuit material occur too early；Secondly, design
Known maximum damping force and adjustability coefficients in engineering structure Vibration Absorption Designing have been adapted in flow and has carried out reverse design magnetic current variable resistance
The flow demand of Buddhist nun's device, has reached the economy in engineering；Finally, the inventive method is workable, is MR damper
Design provide theoretical direction, be easy to its engineer applied and popularization.
Brief description of the drawings
Fig. 1 is the FB(flow block) of the Reverse optimization design method of MR damper of the present invention；
Fig. 2 is the BH curve of magnetic circuit material；
Fig. 3 is magnetic flow liquid null field viscosity-rate curve；
Fig. 4 is magnetic flow liquid BH curve；
Fig. 5 is magnetic flow liquid τy- B curves.
Embodiment
According to following embodiments, the present invention may be better understood.However, as it will be easily appreciated by one skilled in the art that real
Apply the content described by example and be merely to illustrate the present invention, without should be also without limitation on sheet described in detail in claims
Invention.
As shown in figure 1, the Reverse optimization design method of MR damper of the present invention, in given required maximum damping force
In the case of adjustability coefficients, geometry designs and magnetic Circuit Design are united and optimize design, to cause magnetorheological damping
Device disclosure satisfy that required maximum damping force and adjustability coefficients under less size.
With reference to the characteristics of civil engineering structure damping with unified process of optimization, the present embodiment designs a damping force
1.5KN MR damper, i.e. maximum damping force U*=1.5KN, damper work maximal rateFor 25mm/s, adjustable system
Number β0Take 1.2.Piston and piston rod use DT4Electrical pure iron, and piston and piston rod are connected as a single entity, remaining component is adopted
With 45#Steel, Fig. 2 is both BH curves.The a diameter of 1mm of enamel-cover line options copper conductor.Enamel-covered wire, sky during finite element modelling
Gas, the relative permeability of epoxy resin take 1.Magnetic flow liquid can be the magnetic flow liquid of in the market, it is preferred that this seminar
The CB22 type magnetic flow liquids of development, wherein, Fig. 3 is null field viscosity-tensionvelocity curve of the magnetic flow liquid at 25 DEG C, and Fig. 4 is
The BH curve of magnetic flow liquid, Fig. 5 is the τ of magnetic flow liquidy- B curves.Magnetic induction density B=300mT is measured, magnetic flow liquid τ is takeny-
Point when magnetic induction intensity is 0.3T in B curves is the operating point of magnetic flow liquid, so magnetic strength at the working clearance in magnetic Circuit Design
Answer intensity B0For 0.3T, now corresponding maximum shear yield strength τyFor 4.64KPa.Null field viscosity-speed is fitted according to Fig. 3
Relation curve to calculate null field viscosities il under damper work maximal rate 25mm/s be 1.45pa.s.In view of magnetic saturation electric current
Too small, then the adjustable range of electric current is smaller, and magnetic saturation electric current is too big, then damper power is larger, easily hot, considers selected
ImaxFor 1.5A.Diameter of piston rod d intensity is calculated according to Machine Design specification, characteristic of material mechanics and damper stressing conditions
Limit value is 10.23mm (piston rod perforate 4mm), and outer shell barrel thickness t intensity limit value is 3.05mm.
Unified optimization design is carried out to MR damper according to the FB(flow block) shown in Fig. 1, when progress magnetorheological damping
When device is designed, design object is first given, then geometry designs are carried out according to selected materials performance, then on the basis of geometry designs
Magnetic Circuit Design is carried out, compares design parameter to obtain final parameter design value.Whole process is based on MATLAB and ANSYS two
The simulation result of software is exchanged, the geometry designs of calculating and the desired value of magnetic Circuit Design, if being unsatisfactory for design requirement, returns again to weight
New value, emulate, compare, untill meeting design requirement.
The calculation formula of maximum damping force and adjustability coefficients is as follows in the inventive method：
In formula, p0=1.2Mpa.
The concrete analysis process of magnetic circuit ANSYS finite element simulations is in the inventive method：(1) two-dimensional static analysis classes are selected
Type, unit selects two-dimentional 8 Node Quadrilateral Element solid element Plane53；(2) work is set up according to the permeance of known materials respectively
Plug, cylinder barrel, gap magnetic flow liquid, coil, air and the FEM model of sealing epoxy resin part；(3) in model external boundary
Line applies the parallel boundary condition of magnetic flux, grid division；(4) applied in the form of current density (total current divided by area coil)
Plus excitation, static solution is carried out to the model；(5) enter post processing, check magnetic field strength date, be operated gap location and be averaged
The calculating of magnetic induction intensity.
It can be seen that, the unified process of optimization of MR damper is really continuous adjusting parameter until meeting design requirement
Process.By the above-mentioned design process of iterative cycles, comprehensive Practical Project situation, the final parameter size for determining damper, in detail
It is shown in Table 1.Now damper calculating desired value is：FMRD, max=1557.17N, β0=1.23,The inventive method can be grasped
The property made is strong, provides theoretical direction for the design of MR damper, is easy to its engineer applied and popularization.
The major parameter size of the MR damper of table 1
Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and is not to the present invention
The restriction of embodiment.For those of ordinary skill in the field, it can also be made on the basis of the above description
Its various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair
Among the obvious changes or variations that bright spirit is extended out is still in protection scope of the present invention.
Claims (7)
1. a kind of Reverse optimization design method of MR damper, it is characterised in that：This method passes through the maximum needed for determination
Damping force and adjustability coefficients, geometry designs and magnetic Circuit Design are united and carry out Reverse optimization design, until magnetorheological damping
Device meets required maximum damping force and adjustability coefficients under relatively small size；Wherein, geometry designs are emulated using MATLAB
Software computational geometry design object value, magnetic Circuit Design utilizes ANSYS finite element stimulation magnetic Circuit Design desired values.
2. the Reverse optimization design method of MR damper according to claim 1, it is characterised in that：Specifically include as
Lower step：
Step 1, the design object value of MR damper is selected：Maximum damping force U*With adjustability coefficients β0；
Step 2, the maximal rate of damper rod needed for being determined according to actual vibration situationIn conjunction with the magnetorheological of selection
Liquid and magnetic circuit material determine the corresponding maximum shear yield strength τ in magnetic flow liquid operating pointyWith null field viscosities il；
Step 3, the maximum damping force U determined according to step 1*, it is living needed for being calculated according to Machine Design specification and characteristic of material mechanics
Stopper rod diameter d and outer shell barrel thickness t intensity limit value；
Step 4, the permeance of each material is determined and according to the maximum shear yield strength τ selected in step 2ySearch magnetic circuit
Magnetic induction density B is needed at working clearance0；
Step 5, the diameter of piston rod d determined according to step 3 intensity limit value carries out geometry designs；
Step 6, institute's need at the magnetic circuit working clearance that the outer shell barrel thickness t determined according to step 3 intensity limit value and step 4 is determined
Magnetic induction density B0Carry out magnetic Circuit Design；
Step 7, judge whether the geometric parameter and magnetic circuit parameters of design meet requirement, the repeat step 5 if being unsatisfactory for requiring
~6, until geometric parameter and magnetic circuit parameters reach minimum dimension and meet the design maximum damping force U determined in step 1*With can
Adjust factor beta0Requirement.
3. the Reverse optimization design method of MR damper according to claim 2, it is characterised in that：In step 5, institute
Stating the design procedure of geometry designs includes：(1) it is preliminary to choose physical dimension parameter piston diameter D, diameter of piston rod d, workplace
Gap width h and piston effective length L；(2) calculated and obtained most under the initial parameter currently chosen using MATLAB simulation softwares
Big damping force and adjustability coefficients；(3) numerical value and by (2) obtained is compared with design object value, if being unsatisfactory for design requirement, again
Physical dimension parameter is chosen, (1)~(3) are repeated, untill numerical value that simulation calculation is obtained meets design requirement；(4) when
The numerical value that simulation calculation is obtained is met after design requirement, then judges whether the initial parameter of setting can further reduce, if
Smaller value repeat step (1)~(4) can be then chosen again, otherwise choose the parameter set as design result.
4. the Reverse optimization design method of MR damper according to claim 2, it is characterised in that：In step 6, institute
Stating the design procedure of magnetic Circuit Design includes：(1) according to geometry designs result, it is preliminary choose determine turn number N, outer shell barrel thickness t,
Grooving length a and width b；(2) average magnetic induction intensity at the ANSYS finite element stimulation working clearances is utilized(3) judge
Whether grooving length a and width b is less than limit value, carries out next step if meeting, otherwise re-starts geometry designs and carry out
Step (1)~(3)；(4) average magnetic induction intensity at the working clearance in judgment step (2)Whether selected magnetic is more than or equal to
Magnetic induction density B at the working clearance of road0, if it is satisfied, then carrying out next step, otherwise repeat step (1)~(4)；(5) judge to set
Whether fixed initial parameter can further reduce, if can if choose smaller value repeat step (1)~(5) again, otherwise
The parameter set is chosen as design result.
5. the Reverse optimization design method of MR damper according to claim 4, it is characterised in that：Consider that grooving is long
A and width b mechanical characteristic requirement is spent, grooving length a limit value takes a quarter of piston head length, grooving width b limit
Value takes 1/2nd of piston head diameter and diameter of piston rod difference.
6. the Reverse optimization design method of MR damper according to claim 4, it is characterised in that：The ANSYS
The concrete analysis process of finite element simulation is：(1) two-dimensional static analysis type is selected, unit is real from two-dimentional 8 Node Quadrilateral Element
Body unit Plane53；(2) piston, cylinder barrel, gap magnetic flow liquid, coil, sky are set up according to the permeance of known materials respectively
Gas and the FEM model of sealing epoxy resin part；(3) boundary line applies the parallel boundary condition of magnetic flux outside model, draws
Subnetting lattice；(4) apply excitation in the form of current density, static solution is carried out to the model；(5) enter post processing, check magnetic
Field strength degrees of data, is operated gap location average magnetic induction intensityCalculating.
7. the Reverse optimization design method of MR damper according to claim 1 or 2, it is characterised in that：It is described most
Big damping force and the calculation formula of adjustability coefficients are as follows：
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<mi>M</mi>
<mi>R</mi>
<mi>D</mi>
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<mi>max</mi>
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</msub>
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<mi>F</mi>
<mi>&tau;</mi>
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<mi>F</mi>
<mi>&eta;</mi>
</msub>
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<msub>
<mi>F</mi>
<msub>
<mi>p</mi>
<mn>0</mn>
</msub>
</msub>
<mo>;</mo>
</mrow>
<mrow>
<mi>&beta;</mi>
<mo>=</mo>
<mfrac>
<msub>
<mi>F</mi>
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</msub>
</msub>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
In formula,
p0=1.2Mpa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111677806A (en) * | 2020-04-27 | 2020-09-18 | 清华大学 | Method and system for determining damping force of magnetorheological shock absorber |
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| CN105840718A (en) * | 2016-05-16 | 2016-08-10 | 中国人民解放军装甲兵工程学院 | Rapid optimal design method for magnetorheological damper |
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| CN105840718A (en) * | 2016-05-16 | 2016-08-10 | 中国人民解放军装甲兵工程学院 | Rapid optimal design method for magnetorheological damper |
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| ZHAO-DONG XU ET AL: ""Design, performance test and analysis on magnetorheological damper for earthquake mitigation"", 《WILEY ONLINE LIBRARY》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111677806A (en) * | 2020-04-27 | 2020-09-18 | 清华大学 | Method and system for determining damping force of magnetorheological shock absorber |
| CN111677806B (en) * | 2020-04-27 | 2021-03-02 | 清华大学 | Method and system for determining damping force of magnetorheological shock absorber |
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