CN108254148A - Low-frequency electromagnetic vibration table system based on induction coil feedback control - Google Patents
Low-frequency electromagnetic vibration table system based on induction coil feedback control Download PDFInfo
- Publication number
- CN108254148A CN108254148A CN201810060799.1A CN201810060799A CN108254148A CN 108254148 A CN108254148 A CN 108254148A CN 201810060799 A CN201810060799 A CN 201810060799A CN 108254148 A CN108254148 A CN 108254148A
- Authority
- CN
- China
- Prior art keywords
- signal
- feedback
- frequency
- induction coil
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000006698 induction Effects 0.000 title claims abstract description 61
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 5
- 230000010363 phase shift Effects 0.000 description 26
- 230000011218 segmentation Effects 0.000 description 24
- 238000001514 detection method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000003079 width control Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 244000045947 parasite Species 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Particle Accelerators (AREA)
Abstract
The invention discloses the low-frequency electromagnetic vibration table system based on induction coil feedback control, low-frequency electromagnetic vibration table system includes signal generator, speed feedback control device, power amplifier and low frequency electromagnetic shake table；There is driving coil and induction coil on the moving-coil of low-frequency vibration table, speed feedback control device includes feedback section and control unit, the induced voltage input feedback portion of induction coil, the reference signal of signal generator output and the feedback signal difference input control portion of feedback section output, control unit reference signal and feedback signal form control signal input driving coil.The present invention adds induction coil on jigging platform moving coil, shake table VELOCITY EXTRACTION is realized by the induced voltage for detecting induction coil, without directly detecting the equivalent resistance of driving coil, and the velocity measuring network of this method structure without the series resistance in driving coil and builds corresponding analog circuit, simplifies the structure of velocity extraction device.
Description
Technical field
The present invention relates to a kind of low-frequency electromagnetic vibration table systems.
Background technology
Electromagnetic vibration generator system has many advantages, such as that wide frequency range, controllability are good, output waveform precision is high, is widely used in product
Analog vibration environmental test, vibration-measuring sensor calibration etc. fields.In order to further improve shake table in low-frequency range output wave
The precision (reducing the distortion factor) of shape, need to usually build negative feed back control system.Negative feedback control is firstly the need of passing through vibrating sensing
Device (acceleration, speed or displacement sensor) or other movement amount detecting devices detect to obtain the output vibration of electromagnetic vibration generator system
Signal then using this signal as feedback signal, asks poor, deviation signal is after controller and power amplifier with input signal
Excited vibration platform vibrates, and is finally completed the structure of closed-loop control system, realizes the negative-feedback to the shake table output waveform distortion factor
Control.
Chinese patent 201210544489.X proposes a kind of low-frequency electrical based on autonomous relative velocity feed back control system
Magnetic vibration platform system, the system construct negative feed back control system based on a kind of relative velocity extraction element.Relative velocity extracts
The signal that device extracts asks poor after low-pass filter and the first proportional amplifier with signal generator output signal, partially
Difference signal input power amplifier after PID controller adjusts, the output of power amplifier is as low frequency electromagnetic shake table
Drive signal driving shake table output vibration.
The shortcomings that patent, is：
1st, since the equivalent d.c. resistance R of shake table driving coil can not be measured accurately, relative velocity extraction element
In parameter K1Acquisition need to pass through more complicated adjustment process, increase the use difficulty of system；2nd, the device passes through structure
Modeling intend circuit network extraction shake table amount of exercise, due to will in driving circuit series resistance, thermal losses is larger, no
It is suitable for the shake table of high acceleration output.In addition, system is more complicated, the low-frequency noise of analog circuit can move shake table
When generate low frequency wonder, reduce kinematic accuracy.3rd, the output signal size of relative velocity extraction element depends on driving coil
Parameter, since the number of turn of driving coil is limited, thus output reflection relative velocity voltage swing it is relatively low, especially compared with low frequency
Section, so as to affect control effect.
Invention content
The purpose of the present invention is to provide a kind of high low-frequency electromagnetic vibration table systems of motion control accuracy.
Low-frequency electromagnetic vibration table system based on induction coil feedback control, it is characterised in that：Low frequency electromagnetic shake table system
System includes signal generator, speed feedback control device, power amplifier and low frequency electromagnetic shake table；The moving-coil of low-frequency vibration table
Upper to have driving coil and induction coil, speed feedback control device includes feedback section and control unit, the induced electricity of induction coil
Press input feedback portion, the reference signal of signal generator output and the feedback signal difference input control portion of feedback section output, control
Portion's reference signal and feedback signal processed form control signal input driving coil.
Further, the diameter of the induction coil is far smaller than the diameter of driving coil.So as to increase induction coil
The number of turn and total length improve the signal-to-noise ratio of the induced voltage of induction coil generation.
Further, induction coil is in parallel with partial pressure unit, the branch pressure voltage input feedback portion of partial pressure unit, partial pressure unit
Input impedance tends to be infinitely great, meanwhile, divider resistance is also very big, avoids occurring parasite current in induction coil, makes driving line
Parasite current is not coupled in circle, 0 is may be close to so as to flow to end the induced electricity for flowing through induction coil, avoids drawing for induction coil
Enter the interference to electric current in driving coil.
Further, the feedback section of speed feedback control device includes signal correction module, feedback signal adjustment module and filter
Wave device；Control unit includes subtracter and proportional controller, the induced voltage of induction coil after partial pressure input signal correcting module,
Revise signal, revise signal input feedback signal adjustment module are obtained, feedback signal adjustment module carries out revise signal successively
The phase compensation of frequency-division section and range-adjusting form system feedback signal, and the filtered device of system feedback signal is inputted as subtrahend
Subtracter, the signal of signal generator output input subtracter as minuend, and the output signal of subtracter enters proportion adjustment
Device, the control signal of the output signal of proportional controller as low frequency platform.
Further, feedback signal adjustment module includes frequency detecting unit, adjustable phase shifter and adjustable amplifier；Frequency is examined
Unit is surveyed by sequentially connected comparator, counter and frequency controller composition, revise signal and reference signal input ratio jointly
Compared with device, comparator exports the square-wave signal formed by system input signal and reference signal, square-wave signal and digital dock pulse
Signal inputs counter, counter output system input signal cycle number N jointlyfWith the periodicity N of digital dock pulse signals,
Frequency controller calculates the frequency values f for obtaining square-wave signalf,Wherein fsRepresent digital dock pulse signal
Frequency values, frequency controller output phase shifting control pulse and amplitude adjustment control pulse；Phase shifting control pulse input adjustable phase shifter；It adjusts
Width controls pulse input adjustable amplifier.
Further, adjustable phase shifter is in series by two-stage all-pass filter, and frequency detecting unit is inputted according to system to be believed
Number frequency values ffPhase shifting control pulse is exported, phase shifting control Pulse Width Control adjustable phase shifter carries out phase benefit to feedback signal
It repays, reduces the phase difference between input signal and feedback signal, improve feedback control effect.Adjustable phase shifter is in different frequency sections
Phase shift value determine that step is as follows：
S1：In operating frequency range, to the pumping signal of shake table input different frequency, and negative feedback control system is built
System.At different frequencies, out of phase adjustment is carried out to feedback signal, and detects respective frequencies, corresponding feedback signal phase item
The precision characteristic of shake table output signal under part can be fed back according to the feedback signal phase for meeting shake table required precision
Signal required phase shift value at different frequencies.The operating frequency range of shake table is divided into k-1 sections, is expressed as fn≤ f ＜
fn+1, n=1,2,3 ... k-1, the standard of segmentation are identical for the phase shift value of the revise signal in this segmentation；Phase shift value herein
The identical difference referred in the frequency segmentation, between the phase shift value of each frequency is in the deviation range of permission；
S2：Successively to each frequency segmentation, take in the frequency segmentation, the average value of the phase shift value of each frequency is as the frequency
The phase shift value of rate segmentationWithAs fnThe phase shift value of the adjustable phase shifter of frequency segmentation；
S3：To fnThe phase shift value of frequency segmentation is expressed as：
；Wherein：R2For the resistance value of the digital potentiometer in first order all-pass filter, R3For second level all-pass filter
In digital potentiometer resistance value；
S4：Enable R2=R3And step S2 and S3 are combined, acquire the R corresponding to each frequency segmentation2、R3Value, to each frequency
It is segmented, with R2、R3Value is calculated as reference to be needed to input the digital potentiometer in first order all-pass filter and the second level
The phase shifting control pulse number of digital potentiometer in all-pass filter, phase shifting control pulse number control adjustable phase shifter generate
Respective frequencies segmentation phase shift value.
Further, revise signal input adjustable phase shifter, the output terminal of adjustable phase shifter and the input terminal of adjustable amplifier
It is connected.
Alternatively, revise signal inputs adjustable amplifier, the output terminal of adjustable amplifier and the input terminal phase of adjustable phase shifter
Even.
Further, adjustable amplifier is in series by in-phase proportion amplifying circuit and partial pressure potential meter, is used to implement feedback
The amplification or attenuation of signal, obtain suitable depth of feedback.Adjustable amplifier determines step such as in the gain of different frequency sections
Under：
1), in operating frequency range, to the pumping signal of shake table input different frequency, and negative feedback control system is built
System.At different frequencies, apply different gains to feedback signal amplitude, and detect respective frequencies, corresponding feedback signal gain
Under the conditions of shake table output signal precision characteristic, can be obtained instead according to the feedback signal gain for meeting shake table required precision
Feedback signal required gain at different frequencies.The operating frequency range of shake table is divided into (k ' -1) section, is expressed as：
fm≤ f ＜ fm+1, m=1,2,3 ... k ' -1；
2), each frequency segmentation is taken in current frequency segmentation, the average value of the gain of each frequency is as current successively
The yield value p of frequency segmentationm；
3), the yield value of each frequency range is expressed as：
Wherein, R6It is the resistance value of the feedback resistance in scaling circuit in the same direction, R7It is the all-in resistance of partial pressure potential meter
Value, R7wIt is the partial pressure resistance value of partial pressure potential meter；
4) the resistance value R of the fixed resistance of in-phase proportion amplifying circuit, is determined5, it is to need to believe to judge current frequency segmentation
Number amplification or signal attenuation, take R when needing signal being amplified7w=R7, acquire R6；With R6Value and R7wAs reference,
Being calculated needs the tune of the amplitude adjustment control pulse number for inputting feedback resistance in scaling circuit in the same direction and partial pressure potential meter
Width controls pulse number, so as to control the adjustment of the feedback signal amplitude of adjustable amplifier realization corresponding frequency band；
R is taken when needing to decay signal6=0, acquire required R7w；With R6Value and R7wNeeds are calculated as reference
Input the amplitude adjustment control pulse of the amplitude adjustment control pulse number and partial pressure potential meter of feedback resistance in scaling circuit in the same direction
Number, so as to control the adjustment of the feedback signal amplitude of adjustable amplifier realization corresponding frequency band.
Further, the speed feedback control device further includes proportional controller, and the proportional controller is arranged on subtraction
Between device and power amplifier.
The present invention operation principle be：Induction coil inspection is wound by being on the part in uniform magnetic field in moving component
Output vibration velocity of the shake table in low-frequency range is surveyed, and speed feedback control device is constructed based on this, which can divide
The amplitude and phase for the shake table motor message that section obtains detection are adjusted, after the signal adjusted seeks difference with input signal
Obtain deviation signal, the deviation signal only need to pass through ratio enlargement link can input power amplifier, driving shake table output
By the vibration signal of accurate negative feedback control.Therefore, low frequency electromagnetic vibration bench control system proposed by the present invention, which has, simplifies
Speed detector, further improve the negative feedback control effect to low frequency electromagnetic shake table output waveform precision, and drop
Low feedback controller is built and the difficulty of parameter adjustment.
The advantage of the invention is that：
1st, induction coil is added on jigging platform moving coil, shake table speed is realized by the induced voltage for detecting induction coil
Extraction, without directly detecting the equivalent resistance of driving coil, and the velocity measuring network of this method structure is without in driving line
Series resistance and corresponding analog circuit is built on circle, simplify the structure of velocity extraction device, it is often more important that will not drive
Moving winding circuit introduces low-frequency noise, reduces the low frequency wonder of shake table during exercise.
2nd, the number of inductive coil turns added on jigging platform moving coil is more, and the velocity voltage signal amplitude of output is larger, have compared with
High signal-to-noise ratio, is conducive to feedback control.
3rd, feedback signal is formed after revise signal being carried out phase shift and amplitude modulation compensation, feedback signal has a degree of phase
Position compensation, and there is appropriate depth of feedback at different frequencies, improve the precision of the output waveform of shake table.
4th, the working frequency of shake table is segmented, phase shift and amplitude modulation is carried out respectively to each frequency segmentation, without to each
Frequency independently carries out phase shift and amplitude modulation, reduce feedback controller build and the difficulty of parameter adjustment.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the principle of the present invention figure.
Fig. 3 is feedback signal adjustment module structure diagram of the present invention.
Fig. 4 is the structure chart of adjustable phase shifter of the present invention and adjustable amplifier.
Specific embodiment
The present invention is further described with reference to specific embodiment, but does not limit the invention to these tools
Body embodiment.One skilled in the art would recognize that present invention encompasses may include in Claims scope
All alternatives, improvement project and equivalent scheme.
Referring to Fig. 1, Fig. 2, in embodiment 1, based on the low-frequency electromagnetic vibration table system of induction coil feedback control, low frequency
Electromagnetic vibration generator system system includes signal generator, speed feedback control device, power amplifier and low frequency electromagnetic shake table；Low frequency
There is driving coil and induction coil on the moving-coil of shake table.
The driving coil is wound in induction coil in the same winding slot of shake table moving component 1 jointly, can also
Be induction coil from driving coil wound side by side in the different winding slots of shake table moving component, and ensure induction coil with drive
Moving winding is coaxial, and among even air gap magnetic field.Speed feedback control device includes feedback section and control unit, induction coil
Induced voltage input feedback portion, signal generator output reference signal and feedback section output system feedback signal ufbRespectively
Input control portion, control unit reference signal and system feedback signal ufbForm control signal input driving coil.The sensing
The diameter of coil is far smaller than the diameter of driving coil, so as to increase the number of turn of induction coil and total length, improves sensing
The signal-to-noise ratio for the induced voltage that coil generates.Induction coil is in parallel with partial pressure unit, the branch pressure voltage input feedback of partial pressure unit
Portion, the input impedance of partial pressure unit tend to be infinitely great.Partial pressure unit is used to extract the induced voltage of induction coil both ends generation, and
It is handled by signal correction module, obtains the speed signal u of shake tableo.Divider resistance tends to be infinitely great, avoids feeling
It answers and occurs parasite current in coil, make not couple parasite current in driving coil, so as to make to flow through the sensing electric current of induction coil
As close possible to 0, the interference being introduced into electric current in driving coil of induction coil is avoided.
Principle based on induction coil detection low frequency electromagnetic shake table output vibration velocity is：
For conventional low frequency electromagnetic shake table, driving coil (loop length ld) resistance R can be reduced todWith inductance Ld
Cascaded structure.Apply voltage u when applying sine to driving coil both endsi, sinusoidal current i can be generated in driving coild, vibrating
Under the action of the even air gap magnetic field (magnetic induction intensity B) that platform magnetic structure generates, driving coil is by sinusoidal Ampere force
It acts on and generates sinusoidal vibration.Since driving coil and shake table moving component are fixedly mounted, so shake table moving component is defeated
Go out vibration signal.It is typical Mechanical ＆ Electrical Combination System in view of electromagnetic vibration generator system, when shake table moving component, which exports, to be vibrated, drives
Moving winding generates and vibration velocityFor the displacement of shake table moving component,First derivative for x) directly proportional induced electricity
Kinetic potential
Similarly, induction coil (length ls) resistance R can also be reduced tosWith inductance LsCascaded structure.In view of the line of induction
Circle is co-axially mounted with driving coil, when shake table moving component, which exports, to be vibrated, induction coilAlso generation and vibration velocityInto
The induced electromotive force of direct ratio
According to stable state flux coupled principle, it can be assumed that induction coil 12 is intercoupled with driving coil 11 by mutual inductance M.
Further, the vibration processes of shake table moving component 1 can be reduced to mass-spring-damper system single-degree of freedom vibration, m, k,
C is respectively equivalent mass, equivalent stiffness and equivalent damping, as shown in figure 3, obtaining whole mechanical-electric coupling relationship and being
In formula, usFor the induced voltage that 12 both ends of induction coil generate, isTo flow through the sensing electric current of induction coil 12, t is
It is sometime instantaneous,WithThe respectively first derivative of x and second dervative.The partial pressure unit has great impedance, from
And make to flow through the sensing electric current i of induction coil 12sAmplitude as close possible to 0, it is believed that is≈ 0, further, when vibration frequency
When rate f is relatively low, there is dis/ dt=2 π fis≈ 0 avoids the introducing of induction coil 12 to the output vibration of shake table moving component 1
Interference.Therefore, formula (1) can be further simplified as
Shake table input voltage u can be calculated based on the 1st formula in (2) and the 3rd formulaiWith exporting vibration velocityIt
Between transmission function GviFor
In formula, X (s), Ui(s) it is respectively x, uiLaplace transform.In addition input electricity can also be acquired based on formula (2)
Press uiWith induced voltage usBetween transmission function be
In formula, Us(s) it is usLaplace transform.Comparison expression (3) can be obtained with formula (4)
It enables
For the transmission function of signal correction unit, then it is defeated shake table can be obtained by induction coil output voltage according to formula (5)
Go out speed signal.And analog circuit or number are easily passed through as it can be seen that the signal correction unit is a second-order system by formula (6)
Word signal processing unit is realized.Induced voltage through with after the signal correction resume module of transmission function shown in formula (6) with vibration
Platform speed is directly proportional, realizes shake table speed signal uoExtraction.In the present invention, low frequency electromagnetic shake table vibration velocity is examined
It surveys device not having to concatenate pure resistance and structure complicated circuit system with shake table driving coil, avoids the complexity to systematic parameter
Adjustment process further simplifies system structure and reduces the detection difficulty of vibration velocity.
As shown in Figure 1, the feedback section of speed feedback control device include signal correction module, feedback signal adjustment module,
And wave filter；Control unit includes subtracter J1 and proportional controller, and the induced voltage of the induction coil input signal after partial pressure is repaiied
Positive module obtains revise signal, revise signal input feedback signal adjustment module, feedback signal adjustment module by revise signal according to
The secondary phase compensation for carrying out frequency-division section and range-adjusting form system feedback signal ufb, system feedback signal ufbFiltered device is made
Subtracter J1 is inputted for subtrahend, the signal of signal generator output inputs subtracter J1, the output of subtracter J1 as minuend
Signal enters proportional controller, the control signal of the output signal of proportional controller as low frequency platform.When low frequency electromagnetic shake table
When moving component exports vibration signal, induction coil both ends generate induced voltage, and the induced voltage is through signal correction resume module
It is directly proportional to the vibration velocity of low frequency electromagnetic shake table moving component afterwards, it is real by the extraction to signal correction module output voltage
Now to the detection of moving component output vibration velocity.
As shown in figure 3, feedback signal adjustment module includes frequency detecting unit and adjustable phase shifter；Frequency detecting unit by
Its composition of sequentially connected comparator, counter and FREQUENCY CONTROL, revise signal and the common input comparator of reference signal, compare
The system input signal that device output is formed by revise signal and reference signal, square-wave signal and digital dock pulse signal are jointly defeated
Enter counter, counter output system input signal cycle number NfWith the periodicity N of digital dock pulse signals, frequency controller
Calculate the frequency values f for obtaining system input signalf,Wherein fsRepresent the frequency values of digital dock pulse signal；
Phase shifting control pulse input adjustable phase shifter.Counter passes through the digital signal based on FPGA or DSP structures with frequency controller
Processing unit is realized.
System input signal and given reference-input signal to comparator inputted vibration platform, when system input signal
Comparator output high level when amplitude is higher than the amplitude of reference-input signal, comparator on the contrary export low level, as a result, comparator
Square-wave signal is exported, and the frequency of the square-wave signal is identical with system input signal.The frequency of square-wave signal is unknown at this time, because
This, in square-wave signal and digital dock pulse signal colleague's input counter, counter counts the periodicity of square-wave signal, and counts
The frequency of word clock, just can be according to the periodicity of square-wave signal and the periodicity of dagital clock signal it is known that in same time
Ratio calculate the frequency of square wave, the frequency of system input signal is learnt from the frequency of square wave, so as to correspond to corresponding frequency
Segmentation.
Referring to Fig. 4, adjustable phase shifter is in series by two-stage all-pass filter, filtered electrical in first order all-pass wave filtering circuit
It is the first digital potentiometer to hinder (filter resistance refers to the resistance in the RC circuits played a filtering role), and resistance value is expressed as R2, second
Filter resistance is the second digital potentiometer in grade all-pass wave filtering circuit, and resistance value is expressed as R3, the first digital potentiometer and
Two digital potentiometers are adjustable digital potentiometer, and frequency detecting unit is according to the frequency values f of system input signalfExport phase shift
Pulse is controlled, exports the first digital potentiometer of phase shifting control Pulse Width Control of corresponding number and the output pair of the second digital potentiometer
The resistance value answered can realize 0~360 ° of phase shift to the signal for inputting adjustable phase shifter.Adjustable phase shifter is in different frequency sections
Phase shift value determines that step is as follows：
S1：In operating frequency range, to the pumping signal of shake table input different frequency, and negative feedback control system is built
System.At different frequencies, out of phase adjustment is carried out to feedback signal, and detects respective frequencies, corresponding feedback signal phase item
The precision characteristic of shake table output signal under part can be fed back according to the feedback signal phase for meeting shake table required precision
Signal required phase shift value at different frequencies.The operating frequency range of shake table is divided into k-1 sections, is expressed as fn≤ f ＜
fn+1, n=1,2,3 ... k-1, the standard of segmentation are identical for the phase shift value of the revise signal in this segmentation；Phase shift value herein
The identical difference referred in the frequency segmentation, between the phase shift value of each frequency is in the deviation range of permission；
S2：Successively to each frequency segmentation, take in the frequency segmentation, the average value of the phase shift value of each frequency is as the frequency
The phase shift value of rate segmentationWithAs fnThe phase shift value of the adjustable phase shifter of frequency segmentation；
S3：To fnThe phase shift value of frequency segmentation is expressed as：
；Wherein：R2For the resistance value of the digital potentiometer in first order all-pass filter, R3For second level all-pass filter
In digital potentiometer resistance value；
S4：Enable R2=R3And step S2 and S3 are combined, acquire the R corresponding to each frequency segmentation2、R3Value, to each frequency
It is segmented, with R2、R3Value is calculated as reference to be needed to input the digital potentiometer in first order all-pass filter and the second level
The phase shifting control pulse number of digital potentiometer in all-pass filter, the respective frequencies segmentation that control adjustable phase shifter generates
Phase shift value.
The amplitude adjustment control arteries and veins of the corresponding number of system input signal frequency values output that frequency detecting unit is obtained according to detection
Punching control third digital potentiometer and the corresponding resistance value of the 4th digital potentiometer output, are realized to inputting adjustable amplifier signal width
The adjustment of value.Counter output system input signal cycle number NfWith the periodicity N of digital dock pulse signals, frequency controller
Calculate the frequency values f for obtaining system input signalf,Wherein fsRepresent the frequency values of digital dock pulse signal,
Frequency controller exports amplitude adjustment control pulse；Amplitude adjustment control pulse input adjustable amplifier.Adjustable amplifier is put by in-phase proportion
Big circuit and partial pressure potential meter connect to be formed, and the gain of the different frequency sections of adjustable amplifier determines that step is as follows：
1), in operating frequency range, to the pumping signal of shake table input different frequency, and negative feedback control system is built
System.At different frequencies, apply different gains to feedback signal amplitude, and detect respective frequencies, corresponding feedback signal gain
Under the conditions of shake table output signal precision characteristic, can be obtained instead according to the feedback signal gain for meeting shake table required precision
Feedback signal required gain at different frequencies.The operating frequency range of shake table is divided into (k ' -1) section, is expressed as：
fm≤ f ＜ fm+1, m=1,2,3 ... k ' -1；
2), each frequency segmentation is taken in current frequency segmentation, the gain average value of each frequency is as current frequency successively
The gain p of rate segmentationm；
3), the gain of each frequency range is expressed as：
Wherein, R6It is the resistance value of the feedback resistance in scaling circuit in the same direction, R7It is the all-in resistance of partial pressure potential meter
Value, R7wIt is the partial pressure resistance value of partial pressure potential meter；
4) the resistance value R of the fixed resistance of in-phase proportion amplifying circuit, is determined5, it is to need to believe to judge current frequency segmentation
Number amplification or signal attenuation, take R when needing signal being amplified7w=R7, acquire R6；With R6Value and R7wAs reference,
Being calculated needs the tune of the amplitude adjustment control pulse number for inputting feedback resistance in scaling circuit in the same direction and partial pressure potential meter
Width controls pulse number, so as to control the adjustment of the feedback signal amplitude of adjustable amplifier realization corresponding frequency band；
R is taken when needing to decay signal6=0, acquire required R7w；With R6Value and R7wNeeds are calculated as reference
Input the amplitude adjustment control pulse of the amplitude adjustment control pulse number and partial pressure potential meter of feedback resistance in scaling circuit in the same direction
Number, so as to control the adjustment of the feedback signal amplitude of adjustable amplifier realization corresponding frequency band.
In one embodiment, revise signal input adjustable phase shifter, the output terminal and adjustable amplifier of adjustable phase shifter
Input terminal be connected.
In another embodiment, revise signal input adjustable amplifier, the output terminal and Adjustable Phase Shift of adjustable amplifier
The input terminal of device is connected.
Feedback signal adjustment module proposed by the present invention can carry out certainly vibration bench control system feedback signal with frequency-division section
Adjustment is adapted to, makes feedback signal that there is the amplitude and phase for meeting negative feed back control system needs.It was adjusted based on this device
Signal is as feedback signal and carrys out the input signal of automatic signal generator difference is asked to obtain deviation signal, the deviation signal only need by
Ratio enlargement link can input power amplifier, driving shake table output by accurate negative feedback control vibration signal.Base
The negative feedback control effect to shake table output waveform precision can be further improved in the control system of this structure, is reduced anti-
Feedback controller is built and parameter regulation difficulty.
The speed feedback control device further includes proportional controller, and the proportional controller is arranged on subtracter and power
Between amplifier.
The present invention operation principle be：Induction coil inspection is wound by being on the part in uniform magnetic field in moving component
Output vibration velocity of the shake table in low-frequency range is surveyed, and speed feedback control device is constructed based on this, which can divide
The amplitude and phase for the shake table motor message that section obtains detection are adjusted, after the signal adjusted seeks difference with input signal
Obtain deviation signal, the deviation signal only need to pass through ratio enlargement link can input power amplifier, driving shake table output
By the vibration signal of accurate negative feedback control.Therefore, low frequency electromagnetic vibration bench control system proposed by the present invention, which has, simplifies
Speed detector, further improve the negative feedback control effect to low frequency electromagnetic shake table output waveform precision, and drop
Low feedback controller is built and the difficulty of parameter adjustment.
Claims (9)
1. the low-frequency electromagnetic vibration table system based on induction coil feedback control, which is characterized in that fed back and controlled based on induction coil
The low-frequency electromagnetic vibration table system of system, it is characterised in that：Low-frequency electromagnetic vibration table system includes signal generator, velocity feedback control
Device processed, power amplifier and low frequency electromagnetic shake table；There is driving coil and induction coil, speed on the moving-coil of low-frequency vibration table
It spends feed back control system and includes feedback section and control unit, the induced voltage input feedback portion of induction coil, signal generator output
Reference signal and feedback section output feedback signal difference input control portion, control unit formed with reference signal and feedback signal
Control signal input driving coil.
2. the low-frequency electromagnetic vibration table system based on induction coil feedback control according to claims 1, feature exist
In the diameter of the induction coil is far smaller than the diameter of driving coil.
3. the low-frequency electromagnetic vibration table system based on induction coil feedback control according to claims 2, feature exist
In induction coil is in parallel with partial pressure unit, and the branch pressure voltage input feedback portion of partial pressure unit, the input impedance of partial pressure unit tends to
It is infinitely great.
4. the low-frequency electromagnetic vibration table system based on induction coil feedback control according to claims 3, feature exist
In the feedback section of speed feedback control device includes signal correction module, feedback signal adjustment module and wave filter；Control unit
Comprising subtracter and proportional controller, the induced voltage of induction coil after partial pressure input signal correcting module, obtain and correct letter
Number, revise signal is carried out the phase of frequency-division section by revise signal input feedback signal adjustment module, feedback signal adjustment module successively
Position compensation and range-adjusting form system feedback signal, and the filtered device of system feedback signal inputs subtracter, signal as subtrahend
The signal of generator output inputs subtracter as minuend, and the output signal of subtracter enters proportional controller, proportion adjustment
Control signal of the output signal of device as low frequency platform.
5. the low-frequency electromagnetic vibration table system based on induction coil feedback control according to claims 4, feature exist
In feedback signal adjustment module includes frequency detecting unit, adjustable phase shifter and adjustable amplifier；Frequency detecting unit is by successively
The comparator of connection, counter and frequency controller composition, revise signal and the common input comparator of reference signal, comparator are defeated
Go out the square-wave signal formed by system input signal and reference signal, square-wave signal inputs meter jointly with digital dock pulse signal
Number device, counter output system input signal cycle number NfWith the periodicity N of digital dock pulse signals, frequency controller calculating
Obtain the frequency values f of square-wave signalf,Wherein fsRepresent the frequency values of digital dock pulse signal, FREQUENCY CONTROL
Device exports phase shifting control pulse and amplitude adjustment control pulse；Phase shifting control pulse input adjustable phase shifter；Amplitude adjustment control pulse input
Adjustable amplifier.
6. the low-frequency electromagnetic vibration table system based on induction coil feedback control according to claims 5, feature exist
In adjustable phase shifter is in series by two-stage all-pass filter.
7. the low-frequency electromagnetic vibration table system based on induction coil feedback control according to claims 6, feature exist
In revise signal input adjustable phase shifter, the output terminal of adjustable phase shifter is connected with the input terminal of adjustable amplifier, alternatively, repairing
Positive signal inputs adjustable amplifier, and the output terminal of adjustable amplifier is connected with the input terminal of adjustable phase shifter.
8. the low-frequency electromagnetic vibration table system based on induction coil feedback control according to claims 7, feature exist
In adjustable amplifier is in series by in-phase proportion amplifying circuit and partial pressure potential meter.
9. the low-frequency electromagnetic vibration table system based on induction coil feedback control according to claims 8, feature exist
In the speed feedback control device further includes proportional controller, and the proportional controller is arranged on subtracter and power amplification
Between device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810060799.1A CN108254148A (en) | 2018-01-22 | 2018-01-22 | Low-frequency electromagnetic vibration table system based on induction coil feedback control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810060799.1A CN108254148A (en) | 2018-01-22 | 2018-01-22 | Low-frequency electromagnetic vibration table system based on induction coil feedback control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108254148A true CN108254148A (en) | 2018-07-06 |
Family
ID=62742082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810060799.1A Pending CN108254148A (en) | 2018-01-22 | 2018-01-22 | Low-frequency electromagnetic vibration table system based on induction coil feedback control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108254148A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098026A (en) * | 2020-09-08 | 2020-12-18 | 杭州亿恒科技有限公司 | Noise and loop detection accelerating method and system |
| CN112946730A (en) * | 2021-01-26 | 2021-06-11 | 哈尔滨工程大学 | Low-frequency large dynamic double closed-loop feedback method for optical fiber seismometer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4297888A (en) * | 1979-02-28 | 1981-11-03 | Hitachi, Ltd. | Stability control system for vibration test device |
| JP2003285008A (en) * | 2002-01-23 | 2003-10-07 | Inr Kenkyusho:Kk | Ultrasonic wave generation method and apparatus therefor |
| CN1812246A (en) * | 2006-01-04 | 2006-08-02 | 天津大学 | Non-contact liquid medium ultrasound wave electric machine frequency tracking speed control system |
| CN102980653A (en) * | 2012-12-13 | 2013-03-20 | 浙江大学 | Low-frequency electromagnetic vibration table system based on autonomous relative speed feedback control device |
| CN103645384A (en) * | 2013-11-18 | 2014-03-19 | 国家电网公司 | Grounding resistor test power frequency interference inhibition apparatus |
| CN203874979U (en) * | 2014-05-29 | 2014-10-15 | 中国地震局工程力学研究所 | Double-moving-coil servo ultra-low frequency rotary vibrating table |
| CN208109369U (en) * | 2018-01-22 | 2018-11-16 | 浙江大学 | Low-frequency electromagnetic vibration table system based on induction coil feedback control |
-
2018
- 2018-01-22 CN CN201810060799.1A patent/CN108254148A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4297888A (en) * | 1979-02-28 | 1981-11-03 | Hitachi, Ltd. | Stability control system for vibration test device |
| JP2003285008A (en) * | 2002-01-23 | 2003-10-07 | Inr Kenkyusho:Kk | Ultrasonic wave generation method and apparatus therefor |
| CN1812246A (en) * | 2006-01-04 | 2006-08-02 | 天津大学 | Non-contact liquid medium ultrasound wave electric machine frequency tracking speed control system |
| CN102980653A (en) * | 2012-12-13 | 2013-03-20 | 浙江大学 | Low-frequency electromagnetic vibration table system based on autonomous relative speed feedback control device |
| CN103645384A (en) * | 2013-11-18 | 2014-03-19 | 国家电网公司 | Grounding resistor test power frequency interference inhibition apparatus |
| CN203874979U (en) * | 2014-05-29 | 2014-10-15 | 中国地震局工程力学研究所 | Double-moving-coil servo ultra-low frequency rotary vibrating table |
| CN208109369U (en) * | 2018-01-22 | 2018-11-16 | 浙江大学 | Low-frequency electromagnetic vibration table system based on induction coil feedback control |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098026A (en) * | 2020-09-08 | 2020-12-18 | 杭州亿恒科技有限公司 | Noise and loop detection accelerating method and system |
| CN112098026B (en) * | 2020-09-08 | 2022-08-09 | 杭州亿恒科技有限公司 | Noise and loop detection accelerating method and system |
| CN112946730A (en) * | 2021-01-26 | 2021-06-11 | 哈尔滨工程大学 | Low-frequency large dynamic double closed-loop feedback method for optical fiber seismometer |
| CN112946730B (en) * | 2021-01-26 | 2023-07-21 | 哈尔滨工程大学 | Low-frequency large-dynamic double-closed-loop feedback method for fiber seismometer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10623865B2 (en) | System and method for applying a sound signal to a multi coil electrodynamic acoustic transducer | |
| JP4700699B2 (en) | Method for detecting an object enclosed in a medium, and measuring apparatus for carrying out the detection method | |
| CN108333917A (en) | Frequency dividing detector for low-frequency electromagnetic vibration table system feedback control | |
| JPH0919191A (en) | Positioning method for rotor in rotational motor or linear motor | |
| US10397706B2 (en) | Method for avoiding an offset of a membrane of a electrodynamic acoustic transducer | |
| CN104035329A (en) | Automatic vibration calibration system and calibration method | |
| CN108254148A (en) | Low-frequency electromagnetic vibration table system based on induction coil feedback control | |
| US11374522B2 (en) | Adaptive model feedback for haptic controllers | |
| CN110221101B (en) | Low-frequency standard vibration table based on full-state feedback | |
| CN111929492A (en) | Full-digital fluxgate type closed-loop current sensor and current signal acquisition method thereof | |
| CN104237818A (en) | Gradient system and gradient magnetic field control method and MRI (magnetic resonance imaging) system | |
| CN208109369U (en) | Low-frequency electromagnetic vibration table system based on induction coil feedback control | |
| CN111541442A (en) | Method for resolving inductance value of proximity sensor | |
| US20230014749A1 (en) | Metal detector having transmitter with active magnetic compensation | |
| CN208334934U (en) | Frequency dividing detector for low-frequency electromagnetic vibration table system feedback control | |
| US20020050898A1 (en) | Method and arrangement for determining the position of an electromagnetic actuator | |
| CN108344494A (en) | Low frequency electromagnetic shake table movement velocity detection device based on induction coil | |
| CN208109253U (en) | Low frequency electromagnetic shake table movement velocity detection device based on induction coil | |
| CN103033255B (en) | Extraction device for relative motion capacity of low-frequency electromagnetic vibration generator system | |
| CN102980653B (en) | Low-frequency electromagnetic vibration table system based on autonomous relative speed feedback control device | |
| CN105765337B (en) | Inductive measuring probe and the method for operating induction type measuring probe | |
| CN108254147B (en) | Frequency-division amplitude modulation system for feedback signal of vibrating table | |
| CN109723719B (en) | Differential detection type self-sensing electromagnetic bearing and implementation method thereof | |
| JP2018044817A (en) | Position detection device | |
| EP2980429A1 (en) | Improved position detection device of amb |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |