CN106769113B - A kind of discrimination method of electromagnetic type active engine mount parameter - Google Patents
A kind of discrimination method of electromagnetic type active engine mount parameter Download PDFInfo
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Abstract
The present invention relates to a kind of discrimination method of electromagnetic type active engine mount parameter, the method includes the steps: the identification of passive hydraulic parameter is carried out to active engine mount by the first Material Testing Machine, the second Material Testing Machine and hydraulic parameter device for identifying；The identification of actuator's parameters is carried out to active engine mount by the first Material Testing Machine and oscillograph.Compared with prior art, the present invention has many advantages, such as completely to recognize the passive hydraulic parameter of active engine mount and active actuator parameter, with preferable versatility and has preferable accuracy.
Description
Technical field
The present invention relates to power assembly active engine mount fields, more particularly, to a kind of identification of electromagnetic type active engine mount parameter
Method.
Background technique
Nowadays, requirement of the people to vehicle ride comfort is higher and higher, thus NVH (Noise, Vibration and
Harshness) characteristic has become a major criterion for measuring automotive quality.However the need in view of improving fuel economy
Ask, some sedan limousines use engine close cylinder technology, and close cylinder technology increase vibration order it is multifarious simultaneously, aggravation
The vibration problem of engine discontinuity.In addition, the development of hybrid electric vehicle is more and swifter and more violent in recent years, it is anxious to accelerate work
Vibration noise problem caused by motor instant is intervened under condition has seriously affected riding comfort.Powertrain mounting system for
These above-mentioned vibration problems are solved to play an important role.Wherein for active engine mount compared to passive suspension, Semi-active mount can be more
Meet the big rigidity of suspension low frequency, the ideal characterisitics of the small rigidity of high frequency well.And it can be effectively under all frequencies of engine
Vibration is effectively isolated, and has apparent advantage on eliminating transient oscillation.
When carrying out the research such as control algolithm to active engine mount, the accuracy of active engine mount parameter can seriously affect final
Control effect.However, there is presently no the researchs for being directed to active engine mount parameter identification method.Although by hydrodynamic pressure in active engine mount
The identification of parameter can refer to hydraulic mount and Semi-active mount parameter identification method, but these methods are not related to actively hang
Set actuator rigidity, damping, the identification of voice coil constant key parameter.And these methods to the parameters such as equivalent piston area into
When row identification, precision in terms of applying the mode for being displaced load, measurement arranges is lower.Thus design a kind of master
Dynamic suspension parameter identification experimental method has very important practical significance.
Summary of the invention
The purpose of the present invention is provide a kind of discrimination method of electromagnetic type active engine mount parameter regarding to the issue above.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of discrimination method of electromagnetic type active engine mount parameter, the method includes the steps:
A the identification of passive hydraulic parameter) is carried out to active engine mount；
B the identification of actuator's parameters) is carried out to active engine mount.
The actuator's parameters include the stiffness and damp parameters of actuator and the voice coil constant of actuator.
The discrimination method of the stiffness and damp parameters of the actuator specifically:
B11) the first Material Testing Machine carries out clamping to actuator；
B12) the actuation head of the first Material Testing Machine applies displacement load to actuator, according to the displacement and counter-force of actuator
The Static stiffness of information calculating actuator；
B13) the actuation head of the first Material Testing Machine sinusoidal displacement dynamic load different to actuator application amplitude and frequency
Lotus calculates the dynamic stiffness of actuator according to the displacement of actuator and counter-force information；
B14) Static stiffness of the actuator obtained according to step B13) and B14) and dynamic stiffness are fitted, and recognize actuator
Stiffness and damp parameters.
The discrimination method of the voice coil constant of the actuator specifically:
B21) the first Material Testing Machine carries out clamping to actuator, while the voltage input end of actuator and oscillograph being connected
It connects；
B22) the actuation head of the first Material Testing Machine is motivated to the different sinusoidal displacement of actuator application amplitude and frequency,
And pass through the output voltage of oscillograph recording actuator；
B23 the voice coil constant k under different frequency) is solvedm, it calculates average value and obtains the voice coil constant of actuator:
Wherein, U is the output voltage amplitude of oscillograph recording, and A is the displacement amplitude of actuator, and ω is exciting circular frequency.
The passive hydraulic parameter includes upper liquid chamber parameter and inertia channel parameter.
The discrimination method of the upper liquid chamber parameter specifically:
A11) the first Material Testing Machine carries out clamping to rubber spring；
A12) the actuation head of the first Material Testing Machine applies displacement load to rubber spring, according to the displacement of rubber spring and
The Static stiffness of counter-force information calculating rubber spring；
A13) the actuation head of the first Material Testing Machine applies rubber spring and preloads, and applies width to rubber spring in the case where preloading
Value and the different displacement dynamic loading of frequency calculate the dynamic stiffness of rubber spring according to the displacement of rubber spring and counter-force information；
A14 equivalent piston face) is built by the first Material Testing Machine, the second Material Testing Machine and hydraulic parameter device for identifying
Product identification test-bed, carries out the identification of equivalent piston area, obtains equivalent piston area Ap；
A15 upper liquid building volume rigidity) is built by the first Material Testing Machine and hydraulic parameter device for identifying and recognizes testing stand
Frame, the equivalent piston area A obtained in conjunction with step A14)p, the identification of upper liquid building volume rigidity is carried out, it is rigid to obtain upper liquid building volume
Degree, including upper liquid chamber static volume rigidity and upper liquid chamber dynamic volume rigidity；
Wherein, the hydraulic parameter device for identifying includes: hydraulic cylinder, hydraulic pipeline, identification chamber, identification chamber fixture, pressure
The mixed solution of sensor, hydraulic plug and ethylene glycol and water.
The step A14) specifically:
A141 equivalent piston area identification test-bed) is built, specifically: by hydraulic cylinder clamping in the second Material Testing Machine
On, identification chamber is fixed in the first Material Testing Machine, and rubber spring is by identification chamber fixture clamping in identification chamber and the first material
It between testing machine, is connected between hydraulic cylinder and identification chamber by hydraulic pipeline, pressure sensor is connected to identification chamber side, by second
The mixed solution of glycol and water is with bubble free state full of the intracavitary portion of identification；
A142) the actuation head of the first Material Testing Machine applies downward displacement load to rubber spring, according to pressure sensing
The identification cavity pressure of device feedback, the displacement for adjusting the actuation head of the second Material Testing Machine make hydraulic cylinder accommodate identification with pressure constant state
The liquid that chamber arranges；
A143) according to the actuation head displacement x of the first Material Testing Machine1, the second Material Testing Machine actuation head displacement x2And liquid
The piston area A of cylinder pressurecylCalculate equivalent piston area Ap:
The step A15) specifically:
A151 upper liquid building volume rigidity identification test-bed) is built, specifically: identification chamber is fixed on first testing of materials
On machine, rubber spring between the first Material Testing Machine and identification chamber, is closed by identification chamber fixture clamping using hydraulic plug
Connector below chamber is recognized, pressure sensor is connected to identification chamber side, by the mixed solution of ethylene glycol and water with bubble-free shape
State is full of the intracavitary portion of identification；
A152) the actuation head of the first Material Testing Machine applies displacement load, pressure sensor record identification to rubber spring
Chamber internal pressure, according to rubber spring displacement x3, identification cavity pressure p1With equivalent piston area Ap, it is quiet that upper liquid chamber is calculated
State volume stiffness Kv:
A153) the first Material Testing Machine applies rubber spring and preloads, and after rubber spring stabilization, applies to rubber spring
Add the sinusoidal displacement dynamic loading that frequency and amplitude are different, pressure sensor record identification chamber internal pressure calculates different excitations
Lower identification cavity pressure and the transmission function for recognizing intracavity liquid volume, obtain upper liquid chamber dynamic volume rigidity.
The discrimination method of the inertia channel parameter specifically:
A21 inertia channel parameter identification test-bed) is built, specifically: inertia channel is passed through into identification chamber fixture clamping
Intracavitary recognizing, identification chamber is fixed in the first Material Testing Machine and upper seal, and hydraulic cylinder clamping is in the second Material Testing Machine
On, it is connected between hydraulic cylinder and identification chamber by hydraulic pipeline, pressure sensor is separately mounted to two liquid up and down of identification chamber
The mixed solution of ethylene glycol and water was not had inertia channel with bubble free state but was not filled with identification chamber by room；
A22) the actuation head of the second Material Testing Machine low frequency sinusoidal displacement different to hydraulic cylinder application amplitude and frequency
Load, pressure sensor record the pressure of two liquid chambers up and down；
A23 it) is displaced according to the actuation head of the pressure of two liquid chambers up and down of step A22) record and the second Material Testing Machine,
It calculates the pressure difference of upper and lower two liquid chambers and flows through the transmission function between inertia channel liquid volume, then obtain inertia channel
Liquid inertia, laminar flow damping and turbulent flow damping, as inertia channel parameter.
Compared with prior art, the invention has the following advantages:
(1) identification for carrying out actuator's parameters to active engine mount by Material Testing Machine and oscillograph, overcomes traditional examination
Proved recipe method only considered the identification of passive hydraulic parameter, the shortcomings that without considering to the identification of active actuator parameter.
(2) when carrying out the identification of passive hydraulic parameter to active engine mount, test platform is carried out by two Material Testing Machine
Build, test platform is built by a Material Testing Machine compared with existing and is compared come the method for carrying out parameter identification, is applied
The precision for adding displacement load and measurement to arrange liquid volume is higher, then improves the result precision of parameter identification.
(3) stiffness and damp parameters of actuator are obtained by the Static stiffness and dynamic stiffness that are fitted actuator, due to fitting
The precision that mode obtains is higher, therefore the precision of obtained stiffness and damp parameters is also higher.
(4) using the average value of the voice coil constant under different frequency as the voice coil constant of actuator, error is smaller, obtains
As a result more accurate.
Detailed description of the invention
For rubber spring, quiet, dynamic stiffness recognizes test-bed figure to Fig. 1；
Fig. 2 is rubber spring Static stiffness trial curve figure；
Fig. 3 is rubber spring dynamic stiffness trial curve figure, wherein (3a) is dynamic stiffness curve figure, (3b) is lag angular curve
Figure；
Fig. 4 is that equivalent piston area recognizes test-bed figure；
Fig. 5 is equivalent piston area test curve graph；
Fig. 6 is that upper liquid building volume rigidity recognizes test-bed figure；
Fig. 7 is upper liquid chamber static volume stiffness test curve graph；
Fig. 8 is upper liquid chamber dynamic volume stiffness test curve graph, wherein (8a) is expansion stiffness curve figure, (8b) is lag
Angular curve figure；
Fig. 9 is inertia channel parameter identification test-bed figure；
Figure 10 is inertia channel fluid damping and flow magnitude relation figure；
Figure 11 is that actuator Static and dynamic stiffness recognizes test-bed figure；
Figure 12 is actuator Static stiffness curve graph；
Figure 13 is actuator dynamic stiffness trial curve figure, wherein (13a) is dynamic stiffness curve figure, (13b) is that angle of lag is bent
Line chart；
Figure 14 is actuator's parameters matched curve figure；
Figure 15 is that actuator voice coil constant recognizes test-bed schematic diagram；
Figure 16 is actuator voice coil constant curve graph；
Wherein, 1 is the first Material Testing Machine, and 2 be the second Material Testing Machine, and 3 be hydraulic cylinder, and 4 be hydraulic pipeline, and 5 be to distinguish
Know chamber, 6 be identification chamber fixture, and 7 be pressure sensor, and 8 be the mixed solution of ethylene glycol and water.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Present embodiments provide a kind of discrimination method of electromagnetic type active engine mount parameter, including the following steps:
A) active engine mount is carried out by the first Material Testing Machine 1, the second Material Testing Machine 2 and hydraulic parameter device for identifying
The identification of passive hydraulic parameter；
B the identification of actuator's parameters) is carried out to active engine mount by the first Material Testing Machine 1 and oscillograph.
Wherein, actuator's parameters include the stiffness and damp parameters of actuator and the voice coil constant of actuator.
The discrimination method of the stiffness and damp parameters of actuator specifically:
B11) the first Material Testing Machine 1 carries out clamping to actuator；
B12) the actuation head of the first Material Testing Machine 1 applies displacement load to actuator, according to the displacement of actuator and instead
The Static stiffness of force information calculating actuator；
B13) the actuation head of the first Material Testing Machine 1 sinusoidal displacement dynamic load different to actuator application amplitude and frequency
Lotus calculates the dynamic stiffness of actuator according to the displacement of actuator and counter-force information；
B14) Static stiffness of the actuator obtained according to step B13) and B14) and dynamic stiffness are fitted, and recognize actuator
Stiffness and damp parameters.
The discrimination method of the voice coil constant of actuator specifically:
B21) the first Material Testing Machine 1 carries out clamping to actuator, while by the voltage input end and oscillograph of actuator
Connection；
B22) the actuation head of the first Material Testing Machine 1 swashs to the different sinusoidal displacement of actuator application amplitude and frequency
It encourages, and passes through the output voltage of oscillograph recording actuator；
B23 the voice coil constant k under different frequency) is solvedm, it calculates average value and obtains the voice coil constant of actuator:
Wherein, U is the output voltage amplitude of oscillograph recording, and A is the displacement amplitude of actuator, and ω is exciting circular frequency.
Passive hydraulic parameter includes upper liquid chamber parameter and inertia channel parameter.
The discrimination method of upper liquid chamber parameter specifically:
A11) the first Material Testing Machine 1 carries out clamping to rubber spring；
A12) the actuation head of the first Material Testing Machine 1 applies displacement load to rubber spring, according to the displacement of rubber spring
The Static stiffness of rubber spring is calculated with counter-force information；
A13) the actuation head of the first Material Testing Machine 1 applies rubber spring and preloads, and applies in the case where preloading to rubber spring
Amplitude and the different displacement dynamic loading of frequency, according to the displacement of rubber spring and counter-force information calculate rubber spring it is dynamic just
Degree；
A14 equivalent piston) is built by the first Material Testing Machine 1, the second Material Testing Machine 2 and hydraulic parameter device for identifying
Area recognizes test-bed, carries out the identification of equivalent piston area, obtains equivalent piston area Ap；
A15 upper liquid building volume rigidity) is built by the first Material Testing Machine 1 and hydraulic parameter device for identifying and recognizes testing stand
Frame, the equivalent piston area A obtained in conjunction with step A14)p, the identification of upper liquid building volume rigidity is carried out, it is rigid to obtain upper liquid building volume
Degree, including upper liquid chamber static volume rigidity and upper liquid chamber dynamic volume rigidity；
Wherein, the hydraulic parameter device for identifying include: hydraulic cylinder 3, hydraulic pipeline 4, identification chamber 5, identification chamber fixture 6,
The mixed solution 8 of pressure sensor 7, hydraulic plug and ethylene glycol and water.
Step A14) specifically:
A141 equivalent piston area identification test-bed) is built, specifically: by 3 clamping of hydraulic cylinder in second testing of materials
On machine 2, identification chamber 5 is fixed in the first Material Testing Machine 1, and rubber spring is by identification 6 clamping of chamber fixture in identification chamber 5 and the
Between one Material Testing Machine 1, connected between hydraulic cylinder 3 and identification chamber 5 by hydraulic pipeline 4, pressure sensor 7 is connected to identification
The mixed solution 8 of ethylene glycol and water is full of inside identification chamber 5 by 5 side of chamber with bubble free state；
A142) the actuation head of the first Material Testing Machine 1 applies downward displacement load to rubber spring, according to pressure sensing
The identification cavity pressure that device 7 is fed back, the displacement for adjusting the actuation head of the second Material Testing Machine 2 accommodate hydraulic cylinder 3 with pressure constant state
The liquid that identification chamber 5 arranges；
A143) according to the actuation head displacement x of the first Material Testing Machine 11, the second Material Testing Machine 2 actuation head displacement x2With
The piston area A of hydraulic cylinder 3cylCalculate equivalent piston area Ap:
Step A15) specifically:
A151 upper liquid building volume rigidity identification test-bed) is built, specifically: identification chamber 5 is fixed on the examination of the first material
It tests on machine 1, rubber spring between the first Material Testing Machine 1 and identification chamber 5, is blocked up by identification 6 clamping of chamber fixture using hydraulic
Head closing identification 5 lower section connector of chamber, pressure sensor 7 is connected to identification 5 side of chamber, by the mixed solution 8 of ethylene glycol and water
It is full of inside identification chamber 5 with bubble free state；
A152) the actuation head of the first Material Testing Machine 1 applies displacement load to rubber spring, and the record of pressure sensor 7 is distinguished
5 internal pressure of chamber is known, according to rubber spring displacement x3, identification cavity pressure p1With equivalent piston area Ap, upper liquid chamber is calculated
Static volume stiffness Kv:
A153) the first Material Testing Machine 1 applies rubber spring and preloads, after rubber spring stabilization, to rubber spring
Apply frequency and the different sinusoidal displacement dynamic loading of amplitude, record identification 5 internal pressure of chamber of pressure sensor 7 calculates different
The lower identification cavity pressure of excitation and the transmission function for recognizing intracavity liquid volume, obtain upper liquid chamber dynamic volume rigidity.
The discrimination method of inertia channel parameter specifically:
A21 inertia channel parameter identification test-bed) is built, specifically: inertia channel is passed through into identification 6 clamping of chamber fixture
In identification chamber 5, identification chamber 5 is fixed in the first Material Testing Machine 1 and upper seal, 3 clamping of hydraulic cylinder are tried in the second material
It tests on machine 2, is connected between hydraulic cylinder 3 and identification chamber 5 by hydraulic pipeline 4, pressure sensor 7 is separately mounted to identification chamber 5
The mixed solution 8 of ethylene glycol and water was not had inertia channel with bubble free state but was not filled with identification chamber 5 by upper and lower two liquid chambers；
A22) the actuation head of the second Material Testing Machine 2 low frequency sinusoidal position different to the application amplitude of hydraulic cylinder 3 and frequency
Transfer lotus, pressure sensor 7 record the pressure of upper and lower two liquid chambers；
A23) according to the actuation head position of the pressure of two liquid chambers up and down of step A22) record and the second Material Testing Machine 2
It moves, calculate the pressure difference of upper and lower two liquid chambers and flows through the transmission function between inertia channel liquid volume, then obtain inertia
Channel liquid inertia, laminar flow damping and turbulent flow damping, as inertia channel parameter.
It according to above-mentioned steps, is specifically tested, process is as follows:
Step 1: as shown in Figure 1, by active engine mount rubber spring clamping in MTS831 Material Testing Machine, testing machine
Displacement sensor and force snesor are respectively provided on lower upright.After the completion of rubber spring clamping, it is real first to carry out Static stiffness measurement
It tests.Static stiffness experiment altogether loads main spring, unloads three times, and concrete mode is to be loaded with the rate of 7mm/min to suspension, loading capacity
It for 0~-5mm, then unloads, when initial displacement when resetting to 0mm wait suspend is loaded next time.It is preceding be loaded as twice it is pre-
Load, for eliminating test measurement error brought by rubber element Mullins effect, the experimental data during being somebody's turn to do does not give
Record.Displacement as shown in Figure 2-counter-force curve is drawn according to third time load winner of institute spring displacement and counter-force data, is thus counted
Calculating and obtaining the Static stiffness value of rubber spring is 367.9N/mm.
Step 2: after the experiment of rubber spring Static stiffness, first main spring is unloaded, then carries out dynamic stiffness experiment at once.Due to
Static stiffness experiment, thus the step of preloading can be saved in dynamic stiffness experiment were previously just carried out.When dynamic stiffness is tested, first
Apply 1400N to main spring to preload, the dynamic displacement for then successively giving main spring to apply different frequency, various amplitude by control system
Load, specific operating condition are shown in Table 1.Main spring issues heat affecting experimental result, setting each group excitation in prolonged exciting in order to prevent
Between time interval be 1min.Dynamic stiffness and angle of lag under each frequency and amplitude that are calculated according to MTS controller is real
Data are tested, the dynamic stiffness curve of rubber spring as shown in Figure 3 is drawn.
1 rubber spring dynamic stiffness of table experiment excitation operating condition
| Excitation amplitude (mm) | Frequency range (Hz) | Frequency increment (Hz) |
| 1 | 2-20 | 1 |
| 0.5 | 2-20 | 1 |
| 0.1 | 20-200 | 5 |
| 0.05 | 20-200 | 5 |
Step 3: rubber spring is disassembled from MTS831 testing machine, and builds the identification experiment of equivalent piston area
Rack.As shown in figure 4, chamber 5 will be recognized, rubber spring, pressure sensor 7, hydraulic pipeline 4 and hydraulic cylinder 3 carry out assembled connection,
Wherein rubber spring passes through hydraulic pipeline 4 between hydraulic cylinder 3 and identification chamber 5 through identification 6 clamping of chamber fixture on identification chamber 5
Connection, pressure sensor 7 are connected through a screw thread mounted in identification 5 side of chamber.Filling liquid is carried out to device by way of liquid filling under liquid,
Guarantee that the mixed solution full of ethylene glycol and water does not have bubble inside identification chamber 5.Then the device clamping of liquid filling will be completed in material
Expect on testing machine.Rubber spring end is connected with IST3369 Material Testing Machine actuation head, 3 end of hydraulic cylinder and the MTS831 testing of materials
Machine actuation head is connected, and pressure sensor 7 is accessed MTS controller.
Step 3: according to the feedback signal of pressure sensor 7, the actuation head displacement of MTS831 testing machine is adjusted, liquid chamber is made
Internal pressure power is maintained at 0Mpa.Then, the actuation head of IST3369 testing machine applies downward displacement load x to rubber spring2, make
Main spring is declined with the interval of 1mm.5 pressure of identification chamber fed back at the same time according to pressure sensor 7, adjustment and 3 phase of hydraulic cylinder
The actuation end movement x of Material Testing Machine even1To accommodate the liquid volume arranged from identification chamber 5, and keep pressure constant.Rubber
The main spring of glue declines 6mm altogether, and every decline 1mm records a displacement that moved end is made in two sides.According to formulaIt can be in the hope of
Obtain equivalent piston area Ap.A in formulacylFor the piston area of hydraulic cylinder 3.As shown in figure 5, equivalent piston area is 3263mm2。
Step 4: upper liquid building volume rigidity identification experimental stand is built.As shown in fig. 6, by pressure sensor 7, rubber master
Spring and hydraulic plug are mounted on identification chamber 5, carry out liquid filling to device by the way of liquid filling under liquid, guarantee do not have in identification chamber 5
There is bubble.The device that liquid filling is completed is fixed in Material Testing Machine, rubber spring is connect with testing machine actuation head.Pass through material
The actuation head of testing machine applies 3mm displacement load p to main spring1, the pressure data of every decline 0.3mm pressure sensor 7 of record
p1, pressure data in primary identification chamber 5 equally is recorded every 0.3mm when unloading.According to formulax3For rubber spring
Displacement calculates upper liquid chamber static volume stiffness Kv.As shown in fig. 7, upper liquid chamber static volume rigidity is 4.27 × 10-5N/mm2。
Step 5: by Material Testing Machine to rubber spring apply 1400N preload, after main spring stabilization, then to its
Apply the sinusoidal displacement dynamic loading of different frequency and amplitude, specific operating condition is shown in Table 2.Different excitation lower pressure sensors 7 are acquired to remember
The cavity pressure of record and the displacement of main spring.It calculates different frequency and motivates lower cavity pressure and liquid volume (main spring displacement and equivalent work
Fill in area product) between transmission function, acquire upper liquid chamber dynamic volume rigidity as shown in Figure 8.
2 dynamic volume rigidity loading condition of table
Step 6: device for identifying and hydraulic cylinder 3 are disassembled from testing machine, and build inertia channel parameter identification
Test-bed.As shown in figure 9, chamber 5 will be recognized, inertia channel, pressure sensor 7, hydraulic pipeline 4 and hydraulic cylinder 3 carry out assembly
Connection, wherein liquid inertia channel recognizes through fixture clamping in identification chamber 5 and uses seal cap sealing above chamber 5.Hydraulic cylinder 3 with
It is connected between identification chamber 5 by hydraulic pipeline 4, two pressure sensors 7 are separately mounted to two liquid chambers up and down of identification chamber 5.
Filling liquid is carried out to identification chamber 5 by way of liquid filling under liquid, ethylene glycol mixed solution height is made not have inertia channel but be not filled with
Liquid chamber.Then the device clamping for completing liquid filling is fixed on IST3369 testing machine on testing machine wherein recognizing chamber 5, it is hydraulic
Cylinder 3 then clamping in MTS831 Material Testing Machine.
Step 7: the actuation head of adjustment MTS831 Material Testing Machine controls the average pressure of upper identification chamber in 0.2Mpa
Left and right.Load, specific work are displaced by the low frequency sinusoidal that MTS831 actuation head applies different amplitudes and different frequency to hydraulic cylinder 3
Condition is shown in Table 3.The record of pressure sensor 7 records in the process the pressure p of two liquid chambers up and down1And p2。
3 inertia channel parameter identification of table experiment excitation operating condition
Step 8: calculating under each frequency, the pressure differential Δ p of upper lower liquid chamber12With flow through inertia channel liquid volume V
Transmission function between (product of 3 piston area of MTS831 actuation end movement load and hydraulic cylinder).Inertia channel liquid is transported
Dynamic equationLaplace transform is carried out, can be obtainedI in formulaiFor inertia channel
Liquid inertia, ωdrFor the frequency of sinusoidal loading, Ri=Ri1+Ri2| Q |, Ri1For the damping of inertia channel laminar flow, Ri2It is damped for turbulent flow,
Q is inertia channel fluid flow.From above formula it is found that transmission function is liquid inertia IiAnd frequencies omegadrSquare product, thus
Obtain the I under different frequency and amplitude sinusoidal excitationi, it is 2.95 × 10 that final result, which seeks mean value,6kg/m4.The void of transmission function
Portion is RiWith ωdrProduct, make under different frequency and amplitude sinusoidal excitation as shown in Figure 10, fluid flow amplitude QampWith
ωdrThe Trendline of relationship, the intercept of Trendline is R in figure1=2.81 × 107Ns/m5, slope is Ri2=9.82 ×
1010kg/m7。
Step 9: inertia channel device for identifying is disassembled from testing machine.As shown in figure 11, by active engine mount actuation
In MTS831 Material Testing Machine, actuation head loads downwards 1.2mm and is displaced and unloads device clamping, records the actuator during this
Displacement data and counter-force data draw out actuator static displacement-force curve as shown in figure 12.It can be calculated from the curve
Actuator Static stiffness value is 37.8N/mm.
Step 10: after ensuring to complete Static stiffness experiment, actuator has been unloaded and has been resetted.Then it is given by test as moved end
Actuator applies the sinusoidal displacement dynamic loading of different amplitudes and different frequency, and specific operating condition is shown in Table 4.According to the displacement of actuator and
Counter-force information calculates its dynamic stiffness and angle of lag, as shown in figure 13.Then according to formula K=kA+bAω j joins rigidity therein
Number kAWith damping parameter bAIdentification is fitted, when identification on the basis of the empirical curve under 0.2mm amplitude excitations.kAIt takes quiet rigid
The median 54N/mm, damped coefficient b of degree and dynamic stiffness at 200hzAValue is 27Ns/m, such as Figure 14 of the curve after fitting institute
Show.
4 actuator dynamic stiffness experiment condition of table
| Excitation amplitude Ap (mm) | Frequency range (Hz) | Frequency interval (Hz) |
| 0.8 | 2.5-50 | 2.5 |
| 0.6 | 2.5-50 | 2.5 |
| 0.4 | 2.5-100 | 2.5 |
| 0.2 | 2.5-100 | 2.5 |
| 0.2 | 105-200 | 5 |
| 0.1 | 2.5-100 | 2.5 |
| 0.1 | 105-200 | 5 |
Step 11: as shown in figure 15, active engine mount actuator voice coil constant identification rack is built, actuator clamping is existed
In MTS831 Material Testing Machine, it is connected with oscillograph with conducting wire at the voltage input end of actuator.Pass through the work of testing machine
The sinusoidal displacement that dynamic head applies different amplitudes and frequency to actuator motivates, and specific operating condition is shown in Table 5.Oscillograph recording loading procedure
In actuator output voltage, and result is saved to the external USB flash disk of oscillograph.The displacement amplitude of actuator is A, then speed
Amplitude is A ω, output voltage amplitude U.According to formulaSolve the voice coil constant k under different frequencym, such as Figure 15 institute
Show, it is 15.87kgm/As that final result, which seeks mean value,2。
5 actuator voice coil constant of table identifies experiment condition
Claims (5)
1. a kind of discrimination method of electromagnetic type active engine mount parameter, which is characterized in that the method includes the steps:
A the identification of passive hydraulic parameter) is carried out to active engine mount；The passive hydraulic parameter includes that upper liquid chamber parameter and inertia are logical
Road parameter；
B the identification of actuator's parameters) is carried out to active engine mount；The actuator's parameters include actuator stiffness and damp parameters and
The voice coil constant of actuator；
The discrimination method of the voice coil constant of the actuator specifically:
B21) the first Material Testing Machine carries out clamping to actuator, while the voltage input end of actuator being connect with oscillograph；
B22) the actuation head of the first Material Testing Machine is motivated to the different sinusoidal displacement of actuator application amplitude and frequency, and is led to
Cross the output voltage of oscillograph recording actuator；
B23 the voice coil constant k under different frequency) is solvedm, it calculates average value and obtains the voice coil constant of actuator:
Wherein, U is the output voltage amplitude of oscillograph recording, and A is the displacement amplitude of actuator, and ω is exciting circular frequency.
2. the discrimination method of electromagnetic type active engine mount parameter according to claim 1, which is characterized in that the actuator
The discrimination method of stiffness and damp parameters specifically:
B11) the first Material Testing Machine carries out clamping to actuator；
B12) the actuation head of the first Material Testing Machine applies displacement load to actuator, according to the displacement of actuator and counter-force information
Calculate the Static stiffness of actuator；
B13) the actuation head of the first Material Testing Machine sinusoidal displacement dynamic loading different to actuator application amplitude and frequency, root
The dynamic stiffness of actuator is calculated according to the displacement of actuator and counter-force information；
B14) Static stiffness of the actuator obtained according to step B13) and B14) and dynamic stiffness are fitted, and recognize the rigid of actuator
Spend damping parameter.
3. the discrimination method of electromagnetic type active engine mount parameter according to claim 1, which is characterized in that the upper liquid chamber ginseng
Several discrimination methods specifically:
A11) the first Material Testing Machine carries out clamping to rubber spring；
A12) the actuation head of the first Material Testing Machine applies displacement load to rubber spring, according to the displacement and counter-force of rubber spring
The Static stiffness of information calculating rubber spring；
A13) the actuation head of the first Material Testing Machine to rubber spring apply preload, preload under to rubber spring apply amplitude and
The different displacement dynamic loading of frequency calculates the dynamic stiffness of rubber spring according to the displacement of rubber spring and counter-force information；
A14) equivalent piston area is built by the first Material Testing Machine, the second Material Testing Machine and hydraulic parameter device for identifying to distinguish
Know test-bed, carries out the identification of equivalent piston area, obtain equivalent piston area Ap；
A15 upper liquid building volume rigidity) is built by the first Material Testing Machine and hydraulic parameter device for identifying and recognizes test-bed, knot
Close step A14) obtained equivalent piston area Ap, the identification of upper liquid building volume rigidity is carried out, upper liquid building volume rigidity is obtained, including
Upper liquid chamber static volume rigidity and upper liquid chamber dynamic volume rigidity；
Wherein, the hydraulic parameter device for identifying includes: hydraulic cylinder, hydraulic pipeline, identification chamber, identification chamber fixture, pressure sensing
The mixed solution of device, hydraulic plug and ethylene glycol and water；
The step A14) specifically:
A141 equivalent piston area identification test-bed) is built, specifically: by hydraulic cylinder clamping in the second Material Testing Machine,
Identification chamber is fixed in the first Material Testing Machine, and rubber spring is by identification chamber fixture clamping in identification chamber and first testing of materials
It between machine, is connected between hydraulic cylinder and identification chamber by hydraulic pipeline, pressure sensor is connected to identification chamber side, by ethylene glycol
It is full of with the mixed solution of water with bubble free state and recognizes intracavitary portion；
A142) the actuation head of the first Material Testing Machine applies downward displacement load to rubber spring, anti-according to pressure sensor
The identification cavity pressure of feedback, the displacement for adjusting the actuation head of the second Material Testing Machine make hydraulic cylinder accommodate identification chamber row with pressure constant state
The liquid opened；
A143) according to the actuation head displacement x of the first Material Testing Machine1, the second Material Testing Machine actuation head displacement x2And hydraulic cylinder
Piston area AcylCalculate equivalent piston area Ap:
4. the discrimination method of electromagnetic type active engine mount parameter according to claim 3, which is characterized in that the step A15)
Specifically:
A151 upper liquid building volume rigidity identification test-bed) is built, specifically: identification chamber is fixed on the first Material Testing Machine
On, rubber spring between the first Material Testing Machine and identification chamber, is distinguished by identification chamber fixture clamping using the closing of hydraulic plug
Know connector below chamber, pressure sensor is connected to identification chamber side, by the mixed solution of ethylene glycol and water with bubble free state
Full of the intracavitary portion of identification；
A152) the actuation head of the first Material Testing Machine applies displacement load to rubber spring, and pressure sensor record identification is intracavitary
Portion's pressure, according to rubber spring displacement x3, identification cavity pressure p1With equivalent piston area Ap, upper liquid chamber static body is calculated
Product stiffness Kv:
A153) the first Material Testing Machine applies rubber spring and preloads, and after rubber spring stabilization, applies frequency to rubber spring
Rate and the different sinusoidal displacement dynamic loading of amplitude, pressure sensor record identification chamber internal pressure, calculate and distinguish under different excitations
Know cavity pressure and recognize the transmission function of intracavity liquid volume, obtains upper liquid chamber dynamic volume rigidity.
5. the discrimination method of electromagnetic type active engine mount parameter according to claim 3, which is characterized in that the inertia channel
The discrimination method of parameter specifically:
A21 inertia channel parameter identification test-bed) is built, specifically: inertia channel is being distinguished by recognizing chamber fixture clamping
Know intracavitary, identification chamber is fixed in the first Material Testing Machine and upper seal, and hydraulic cylinder clamping is in the second Material Testing Machine, liquid
It is connected between cylinder pressure and identification chamber by hydraulic pipeline, pressure sensor is separately mounted to two liquid chambers up and down of identification chamber, will
The mixed solution of ethylene glycol and water did not had inertia channel with bubble free state but was not filled with identification chamber；
A22) the actuation head of the second Material Testing Machine is displaced load to the different low frequency sinusoidal of hydraulic cylinder application amplitude and frequency,
Pressure sensor records the pressure of two liquid chambers up and down；
A23 it) according to the actuation head displacement of the pressure and the second Material Testing Machine of two liquid chambers up and down of step A22) record, calculates
The pressure difference of upper and lower two liquid chambers and the transmission function between inertia channel liquid volume is flowed through, then obtains inertia channel liquid
Inertia, laminar flow damping and turbulent flow damping, as inertia channel parameter.
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