CN1032864A - Digital random vibration control equalization methods and control system thereof and equipment - Google Patents
Digital random vibration control equalization methods and control system thereof and equipment Download PDFInfo
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Abstract
A kind of digital random vibration control equalization methods and vibration control equipment thereof, it will by sensor pick up through the transducer conversion and the oscillation power spectrum, before average computation, oscillation intensity is just therefrom separated earlier, calculate balanced the correction separately, no longer carry out multiple averaging, remaining " frequency spectrum " then revised with the spectral equalization method is balanced.This vibration control equipment is made up of shaking table and control device, and control device is a control system, and " frequency spectrum " equalizing system two parts of its remainder by the balanced update the system of oscillation intensity (frequency spectrum effective value) with after removing oscillation intensity are formed.
Description
The invention belongs to the control system of vibration environment test equipment, and the vibratory equipment that has this system.
In commercial production and engineering, many test specimens need carry out random vibration test.This test generally is installed on test specimen on the shaking table, with control system shaking table and test specimen thereof is among the predetermined random vibration state.Now Chang Yong vibration control system is to be the digital random vibration control system of principle with the spectral equalization method, referring to United States Patent (USP) 3710082 and 3848115.This vibration control system can excite the vibration of multiple frequency at synchronization, and spectral range is wide, and adjusts simply, and repeatability is good, is therefore used widely.This digital random vibration control system, its frame principle figure as shown in Figure 1,1 is controlled device shaking table (it comprises power amplifier, vibrator, test specimen, sensor) among the figure, and 2 is the A/D transducer, and 3 is time domain-frequency domain spectrum transformation device, 4 is the linear averaging device, 5 is the exponent-weighted average device, and 6 is comparer (divider Sr/Sym), and 7 is the phase randomization device, 8 are reference power spectrum storer, and 9 for revising S * n+
=S * n(S
r/ S
Yn) corrector, 10 is frequency domain-time-domain spectral transducer, 11 is the time-domain randomization generator, 12 is the D/A transducer.
The control procedure of this system is: go the vibrator of drive controlling object shaking table 1 to vibrate by drive signal S * n, and picked up the vibration signal of test specimen by the sensor of shaking table 1, this moment, signal at this moment was different with former drive signal because of the transmission characteristic of shaking table itself and test specimen and non-linear.This vibration signal is through A/D(mould/number) converter 2 is transformed to digital signal, by time domain/frequency domain converter 3 time-domain signal is transformed to power spectrum Syn again, for obtaining the power controlling spectrum Syn(ω of high confidence level) value, need Syn(ω) average the raising degree of freedom through repeatedly measuring, this is K by linear averaging 4(average time) and exponential average device 5(weighting coefficient be N) carry out, in average computation, as degree of freedom NOF=2K(2N-1) bigger, Syn(ω) estimation accuracy is higher.This power controlling spectrum Syn(ω) by comparer 6 and predetermined reference power spectrum Sr(ω) compare, difference is relatively delivered to corrector 9 revise S
Xn+ 1(ω)=and Sxn(ω) (S
r(ω)/S
Yn(ω)) finish and once select generation, compose Sxn+1(ω and produce new driving power), after this with Sxn+1(ω) synthesize complex number spectrum with random phase generator 7, and deliver to frequency domain-time-domain spectral transducer 10, make a frame frequency territory drive signal become a frame time domain driving signal, then by time-domain randomization generator 11 with a frame time domain driving signal randomization, becoming continuous multiframe time-domain signal uses as drive signal, by the transducer 12 of D/A(number-Mo) 11 time-domain signal is become simulating signal again, remove to drive vibrator once more, the repetitive operation of process like this, the feasible power spectrum Sxn that drives the drive signal of shaking table constantly revises according to the characteristic of shaking table and test specimen, makes the oscillation power spectrum (Sy of shaking table and test specimen
n) last to compose (Sr) identical with giving fixed reference power for shape, thereby finish random vibration closed-loop control process.
From the above, the spectral equalization of the closed-loop control system of controlled device-shaking table, its ultimate principle is the transport function revised law, its choosing for formula is:
Sx
n＋1（ω）＝ (Sr（ω）)/(H（ω）) = (Sr（ω）)/(Sy
n（ω）/Sx
n（ω）) =Sx
n（ω）· (Sr（ω）)/(Sy
n（ω）)
H(ω in the formula) be the transport function of controlled device,
Sr(ω) be the reference power spectrum, i.e. the test specimen rumble spectrum that will reach,
Sy
n(ω) be the n time control power spectrum,
Sx
n(ω) be the n time driving power spectrum,
Sx(n+1) (ω) be the n+1 time driving power spectrum.
The problem that above-mentioned digital random control system exists is:
1. the erection rate of spectral equalization is slow, the variation of responding system in time, this be because: (1) frequency spectrum FEEDBACK CONTROL is different from time domain feedback, it will adopt frame data (such as 1024 point data) earlier could begin to carry out spectrum transformation, and the calculated amount of spectrum transformation own is big, computing time is long, thereby the time interval of required correction is long.Such as, be 2KH at the vibration frequency span
ZThe time, the sample frame time is 0.2 second, if time domain-frequency domain transform be calculated as 0.1 second, need 0.3 second time just can measure power spectrum so.(2) as can be known, the key of spectral equalization is to measure rapidly and accurately the transfer function H (ω) of controlled device, that is measures power controlling spectrum Sy rapidly and accurately by top iterative formula
n(ω).When pseudorandom was vibrated, the time domain vibration signal was the cycle, and when object was linear time invariant system, frame sampling data (one-period) can be measured Sy in theory
n(ω), promptly once revise and to reach balanced.But actual vibration test true random vibration and the real systems of adopting all have non-linear existence more, according to theory of random processes, the power spectrum valuation of true random vibration signal must be average through repeatedly measuring, if will improve Syn(ω) accuracy and the degree of confidence of valuation, must strengthen the degree of freedom N of measurement
OF, that is to improve K or N.Such as requiring measuring accuracy to be ± the 1dB(90% degree of confidence) time, when the valuation of calculation control spectrum, at least should accumulate 126 degree of freedom, but linear averaging number of times excessive (K is big), each just length of interlude of revising, balancing speed is just slow, and the just variation of responding system is in time tested dangerous.Such as working as N
OF=126 o'clock, with linear averaging (N=1), then require K=63 as only, 63 control spectrums of promptly every measurement are just revised once, need 0.3 second if measure once, just need 19 seconds 63 times, and the problem of generation is just uncontrollable in these 19 seconds like this; As strengthen exponential weighting coefficient N, as K=1 N=32 then, though do not increase the correction time at interval, but make system responses slack-off, generation time lags behind, such as when the N=16, according to Synew in exponent-weighted average formula S yneW=Syold+ ((SyLast-syold)/(the N)) formula is new exponential average, SyoLd is last exponential average, and SyLaSt is the measured value of this control spectrum, by formula as seen, this measured value only accounts for 1/ (N)=1/16 to exponential average result's contribution, the error that system performance changes or external interference causes will on average just obviously show through 16 measurement at least, as measure once be 0.3 second then after 5 seconds, know by the closed-loop control theory, easily produce vibration big time lag, restrain slack-offly rapidly, and overshoot is very big, makes the The whole control system instability.Because following situation in the vibrating device of practical application, will take place in the above-mentioned existing problem of equalization methods:
(1) when oscillation intensity ascending, descending level or Be Controlled target gain when changing, oscillation intensity will just can reach stable through repeatedly vibrating, such as when the N=16, then will through revise for tens times, repeatedly vibration could be stablized, and oscillation amplitude at this moment can reach more than tens percent.This long-time hard oscillation excessively easily makes the test specimen overtesting, perhaps causes test specimen to damage.
(2) change or system is subjected to strong external interference and produces resonance during peak valley when shaking table test specimen self character, system needs to revise, repeatedly vibrate and could compensate through tens times, balancing speed is slow excessively, though at this moment the total oscillation intensity of system changes not too greatly, but have the local resonance peak for a long time, the resonance position of test specimen easily produces overtesting or damage.
Its dynamic quality of digital random vibration control system of 2 existing spectral equalization revised laws is poor.This is because lack the improvement of correction link in the system, in general control system, for making system stability, correction link is all arranged, but because of the frequency spectrum correction will be by line relatively, proofread and correct (such as 512 spectral lines commonly used by line, same correction algorithm will repeat 512 times) in order to satisfy the requirement of control in real time, existing traditional spectral equalization method adopts this algorithm of simple multiplication and division algorithm (Sxn+1=Sxn (Sr)/(Syn)) simpler, correction time is wanted much shorter than the algorithm that correction link is arranged, but dynamic quality is poor.
In order to improve above-mentioned existing problems, hope can have a kind of new fast, stable, high-precision equalization methods, it can make new control system and stabilization of equipment performance thereof good, the precision height, balancing speed is fast.The design of implementing this purpose is: the part that does not need in existing traditional equalization methods to carry out multiple averaging calculating is divided away from traditional frequency spectrum correction, do not carry out multiple averaging, and deal carefully with other method, remaining portions of the spectrum is then still used original spectral equalization method.So just can make vibration control system reduce the time interval of time lag or correction, the number of oscillation is reduced, quicken balancing speed.
Above-mentioned design can go to solve with the combination of two kinds of new equalization methods or two kinds of new methods respectively, the first changes to shaking table test specimen self character or strong external interference is arranged and the local resonance peak situation that produces (excessive local error point is arranged this moment), to adopt the part to reduce the method that degree of freedom is quickened correction, it two is from power spectrum the oscillation intensity branch to be gone out independent control, make oscillation intensity fast, stable, balanced accurately, to prevent that oscillation intensity is overproof and to depart from the generation that makes a large amount of overproof situations of spectral line because of oscillation intensity.
Above-mentioned two kinds of methods can select to adopt one of them according to the needs of the vibration environment of reality, also can be with two methods in conjunction with employing.
Relevant local quicken modification method and formed do not wait degree of freedom frequency spectrum correction vibration control system and equipment thereof, we propose patented claim simultaneously, and are described in detail in application documents, referring to Chinese patent application 87/07034.
What the present invention relates to is a kind of new digital random vibration control equalization methods and control system and equipment, its objective is to improve existing vibration control system, make fast by the vibratory equipment balancing speed of this new system control, stability good, precision is high.
Feature of the present invention is: it by shaking table 1, analogue-digital converter 2, time domain-frequency domain transform device 3, oscillation intensity (frequency spectrum effective value) balanced update the system and the balanced update the system of the frequency spectrum after removing oscillation intensity formed.Also be about to the vibration signal that the sensor by shaking table picks up, oscillation power spectrum by number-Mo (A/D) transducer 2, time domain-frequency domain spectrum transformation device 3 conversions, before multiple averaging is calculated, oscillation intensity (root-mean-square value) is isolated from frequency spectrum earlier, make power spectrum be divided into oscillation intensity and " spectrum shape " two parts, it is carried out equilibrium correction respectively.
Principle of the present invention is that oscillation intensity (root-mean-square value) itself is the full gain decision by system, it is not a stochastic process, do not need multiple averaging to calculate, it was just isolated from spectrum shape before average computation, separately root-mean-square value (effective value) is carried out equilibrium, revise, and no longer average calculating, this just makes the correction time of effective value shorten (such as about 10 times) greatly, also can avoid simultaneously because of exponent-weighted average caused time lag, make close-loop feedback stable, the number of oscillation reduces, make system-gain is changed, the compensation that oscillation intensity changes is more faster than existing classic method, be that balancing speed is accelerated, and strengthened the security of test; For the equilibrium of remaining " spectrum shape ", to go out because oscillation intensity is separated, the effective value of drive signal just can be more stable, in the equilibrium of spectrum shape, just can not produce excessive error owing to intensity departs from like this, the number of oscillation just reduces in the equilibrium.Comprehensively above-mentioned, because the present invention isolated oscillation intensity earlier before average computation, balanced separately the correction makes the retardation time of whole vibration control system few, it is fast to change response, vibration reduces, good stability, and balancing speed is fast, thereby it the transient process vibration is caused can suppress because of oscillation intensity ascending, descending level or controlled device change in gain the time crosses strong vibration, make test safer, the frequency spectrum time accelerates, the efficient height.Simultaneously, the present invention can adopt correction link to proofread and correct the characteristic of controlled device in the control algolithm of effective value correction, to improve the dynamic quality of system.Such as adopting pid number formula proportional integral derivative controller or other DDC algorithms,, can obviously not increase balanced computing time because of oscillation intensity is a unitary variant.
Fig. 1 is the block scheme of traditional spectral equalization method (etc. degree of freedom spectral equalization) for the digital random vibration control system of principle
Fig. 2～Fig. 5 is the block scheme of several enforcement situations of the present invention, wherein
Fig. 2, Fig. 4 are the block scheme that has the digital random vibration control system of the balanced update the system of oscillation intensity of high-precision gain amplifier and spectral equalization update the system.Wherein the spectral equalization update the system of Fig. 2 is traditional (etc. degree of freedom) spectral equalization, and Fig. 4's is the spectral equalization that does not wait degree of freedom.
Fig. 3, Fig. 5 are the block scheme that has the digital random vibration control system of the oscillation intensity update the system of software gain compensator and spectral equalization update the system.Wherein the spectral equalization update the system of Fig. 3 is traditional (etc. degree of freedom) spectral equalization, and Fig. 5's is the spectral equalization that does not wait degree of freedom.
1～12 identical among among Fig. 2～Fig. 5 1～12 and Fig. 1,13 quicken corrector for unusual overproof some part reduces degree of freedom, but 14 are variable freedom linear averaging device, but 15 is variable freedom exponent-weighted average device, 16 is correction link, 17 is comparer, and 18 is correction link, and 19 is the software gain compensator, 20 is high-precision gain amplifier, 21 is the root-mean-square value counter, and 22 is the predetermined reference root-mean-square value, and 23 is multiplier.
The combination of " spectrum shape " update the system and oscillation intensity update the system is as follows in Fig. 2, Fig. 3, Fig. 4, the digital random vibration control system shown in Figure 5:
" spectrum shape " update the system of Fig. 2 is formed by 4,5,6,7,8,9,10,11,12,20, and the oscillation intensity update the system is formed by 17,20,21,22,23.
" spectrum shape " update the system of Fig. 3 is formed by 4,5,6,7,8,9,10,11,19,12, and the oscillation intensity update the system is formed by 12,17,19,21,22,23.
" spectrum shape " update the system of Fig. 4 is formed by 13,14,15,6,7,8,9,10,11,12,20, and the oscillation intensity update the system is formed by 17,20,21,22,23.
" spectrum shape " update the system of Fig. 5 is formed by 13,14,15,6,7,8,9,10,11,19,12, and the oscillation intensity update the system is formed by 12,17,19,21,22,23.
The control procedure of above-mentioned four kinds of performances is: by shaking table sensor 1, A/D converter 2, oscillation power spectrum that time-frequency-frequency domain territory transducer 3 gets, before average computation, by root mean square calculator 21 root-mean-square value of rumble spectrum is calculated, compare at comparer 17 with reference root-mean-square value 22 again, its difference signal is input to gain compensator 19 or gain amplifier 20, synthetic with frequency spectrum spectrum shape through correction, obtain the vibration that a new driving power spectrum removes to adjust object.Root-mean-square value calculates and can (in time domain-frequency domain spectrum transformation device 3 backs) carry out in frequency domain, also can (before time domain-frequency domain spectrum transformation device) carry out in time domain, and the latter is fast than the former speed, and it is separated it by multiplier 23.The oscillation intensity update the system is made up of with gain compensator 19 or gain amplifier 20 root-mean-square value counter 21, predetermined reference root-mean-square value 22, comparer 17, multiplier 23, in order to improve the dynamic perfromance of system, usually can behind comparer 17, add a pid correction link (or other DDC control algolithms).Frequency spectrum update the system in Fig. 2～Fig. 5 system, Fig. 2, Fig. 3 are free spectral equalization update the system such as traditional, Fig. 4, Fig. 5 are the spectral equalization update the system that does not wait degree of freedom, it is characterized in that but linear averaging device 14, exponential average device 15 all are variable freedoms, but the quick update the system of these two averagers and comparer 6, predetermined reference frequency spectrum 8, a variable freedom of overproof corrector 13 compositions.When the error of power spectrum valuation and reference power spectrum is in the estimation accuracy scope, this system is inoperative, the frequency spectrum correction is undertaken by traditional modification method, uses high-freedom degree, makes spectrum estimation accuracy height, as local spectral line error when excessive, then local acceleration corrector sends signal, but the variable freedom averager just reduces degree of freedom, and makeover process is settled out rapidly, error is reduced in the spectrum estimation accuracy scope very soon, and then strengthens degree of freedom by the correction of traditional frequency spectrum revised law.
For the figure place that makes the several mode converters of D/A makes full use of, the system of Fig. 2, Fig. 4 is better than Fig. 3, Fig. 5, dynamic range more can improve, and when the precision of high-precision programmable amplifier can be considered continuous variable during for 0.1dB, out-put dynamic range is obviously improved.Because in the system of Fig. 2, Fig. 4, the correction of spectrum line is after oscillation intensity is isolated, just synthetic when arriving the high precision gain amplifier behind the D/A digital-analog conversion with the oscillation intensity modified value, therefore the D/A transducer can remain at the optimum range state, this just can maximally utilise the dynamic range of D/A, but the system of Fig. 2, Fig. 4 must high-precision gain amplifier of increase than the system of Fig. 3, Fig. 5.And in the system of Fig. 3, Fig. 5, the synthesizing before the D/A digital-to-analog converter of frequency spectrum correction and oscillation intensity correction, so the dynamic range of D/A just can not make full use of.
Above-mentioned Fig. 2 and Fig. 4 system or Fig. 3 and Fig. 5 system, its difference be Fig. 2, Fig. 3 system be mainly used in that extraneous strong jamming or shaking table test specimen self character change and the local resonance peak valley that produces less occasion (be difficult for that excessive local error point is arranged this moment) this moment remaining " spectrum shape " the spectral equalization system of degree of freedom such as balanced available, otherwise, then with the system of Fig. 4 or Fig. 5.This time-frequency spectrum update the system adopts the local frequency spectrum update the system that does not wait degree of freedom that quickens revised law.
Four kinds of control system of Fig. 2～Fig. 5 all can between root-mean-square value comparer 17 and gain amplifier 20 or the software gain compensator 19, quicken to increase by a correction link 18,16, the dynamicizer matter of improvement system between corrector 13 and the corrector 9.
For oscillation intensity ascending, descending level change greatly or the controlled device change in gain greatly and the system of the more vibrational state employing Fig. 4 of external interference is ideal.Because the oscillation intensity update the system is balanced separately oscillation intensity, accelerated the balancing speed of spectrum shape greatly, and " the composing shape " of having removed oscillation intensity, when degree of freedom is enough high, during such as NOF=126, " spectrum shape " should be in corresponding frequency spectrum estimation accuracy scope with the error of predetermined reference spectrum, and in balancing procedure, the number of oscillation is few therefore " to compose shape ", speed is fast, good stability, D/A transducer precision can make full use of, and the dynamic quality of this system is optimized far away, even when having local spectral line error to surpass the frequency spectrum estimation accuracy, also do not wait the degree of freedom update the system because of having this moment, makes local overproof spectral line improve stability because of reducing average time, restrains vibration.After this spectral line error reduces rapidly, can return to the average time the same again and carry out equilibrium again with other spectral lines, and other spectral lines still have separately balanced degree of freedom according to the error condition of each spectral line, so both accelerated the balancing speed of overproof spectral line, do not influence the precision of all the other balanced good spectral lines again, the balancing speed of " spectrum shape " is improved greatly, and precision is also fine.
The closed loop feedback system of embodiments of the invention as being made up of following array apparatus reaches the vibratory equipment of control system thus.
Shaking table 1 can be electromagnetic vibration generator system or electro-hydraulic servo hydraulic vibration gen, or other vibrators.
A/D converter 2 can be with general 12, the A/D transducer of slewing rate＜25 μ s.
Time domain-frequency domain spectrum transformation device 3
(1) by LSI digital signal chip such as TMS32010 or TMS32020,1024 FFT conversion times are less than 50mS, and speed is fast.
(2), finish 1024 about 300mS of FFT conversion as TRN1010 and software mixing by 16 * 16 hardware multipliers.
(3) finish 1024 FFT conversion by the 16 digit microcomputer software program, need about 1 second.
Linear averaging device 4 is finished by microcomputer software
Exponent-weighted average device 5 is finished by microcomputer software
Comparer 6,17 is finished by microcomputer software
Phase randomization device 7 produces pseudo-random binary sequence by the hardware shift register logical circuit, as random phase; Also available microcomputer software is finished.
Reference power spectrum storer 8 is finished by the microcomputer memory reservoir
Corrector (multiplier) 9 is finished by 16 hardware multipliers, as TRW1010, also can be finished by the microcomputer software instruction.
Frequency domain-same the hardware of time-domain spectral transducer 10 and 3, just software gets final product with the IFFT program.
Time-domain randomization generator 11.
(1) can finish by hardware logic electric circuit shift register, counter and storer etc.
(2) can add storer by the TMS320.10 digital signal processing chip and finish time-domain randomization, simpler, quick.
(3) can finish by microcomputer software.
Analog-digital converter 12 can get final product with general 12, slewing rate＜5 μ s D/A transducers, as DAC80.
Unusual overproof some part reduces degree of freedom acceleration corrector 13 and can be finished by microcomputer software.
The linear averaging device 14 of variable K is finished by microcomputer software.
The exponent-weighted average device 15 of variable N is finished by microcomputer software.
Software gain compensator 19 is finished by computing machine.
High-precision gain compensator is seen another patented claim.
Root-mean-square value counter 21, predetermined reference root-mean-square value 22, multiplier 23 are all finished by microcomputer.
Most preferred embodiment:, time domain-frequency domain spectrum transformation device 3(frequency domain-time-domain spectral transducer 10) except shaking table 1, outside the corrector 9, high precision gain amplifier 20, number-Mo (A/D), mould-number (D/A) transducer 2,12, all the other are finished by microcomputer.
When Fig. 6,7 upgrades for oscillation intensity, the step response simulation curve of effective value, abscissa is for revising number of times, and ordinate is an oscillation intensity, degree of freedom NOF=248(K=4, N=16) Fig. 6 is the effective value response of the supposition controlled device step response during for perfect condition.Curve (1) is the response curve of traditional frequency spectrum revised law, it is through repeatedly vibration, tens corrections just can tend towards stability, and curve (2) adopts the opertaing device of Fig. 2,3 oscillation intensity separating equilibrium corrections, and the last correction of its effective value response theory can be stablized.Fig. 7 still adopts the vibration control equipment of Fig. 2,3 oscillation intensity separating equilibrium corrections, but the effective value response life period hysteresis of supposition controlled device, curve among the figure (4) is the effective value step response curve of this moment, has significantly vibration as seen from the figure.Curve (3) is the step response curve behind the adding pid correction in the oscillation intensity correction, and step response is obviously improved as seen from the figure, and just slightly the upper punch vibration has weakened greatly.
Fig. 8, Fig. 9 cause the excessive simulation fair curve when overproof of local spectral line for resonance or strong external interference.Degree of freedom NOF=248(K=4 N=16), abscissa is for revising number of times, ordinate is an oscillation intensity, curve 1 is desirable fair curve, once revise, curve (2) is the curve after the classic method multiple averaging, curve (3) is the curve before the classic method multiple averaging, all there are time lag in curve (2), (3), and erection rate is slow, and excessive overproof existence is for a long time arranged, curve (4) is to adopt not wait the correction of degree of freedom frequency spectrum, error just reduces rapidly after twice correction as seen from Figure 9, and is stable soon, and reaches the spectrum estimation accuracy.
By above-mentioned these curves as can be known, new modification method is superior at all more existing traditional revised laws in aspect such as erection rate, correction precision, stability, safety, and it has significant practical value and economic benefit.
Claims (8)
1, a kind of digital random vibration control equalization methods, it will be picked up by sensor, through several mode converters, the conversion of time domain one frequency domain spectrum transformation device and the oscillation power spectrum before average computation, oscillation intensity (root-mean-square value) is just therefrom isolated earlier, calculate balanced the correction separately, calculate and no longer carry out multiple averaging, remaining " frequency spectrum " then revised with the spectral equalization method is balanced.
2, its involving vibrations platform of a kind of digital random vibration control equipment (comprising power amplifier, vibrator, test specimen, sensor) and digital random vibration control system two parts of forming by analogue-digital converter 2, time domain-frequency domain transform device 3 and balanced update the system, it is characterized in that described balanced update the system by the balanced update the system of oscillation intensity (frequency spectrum effective value) and after removing oscillation intensity the balanced update the system two parts of remaining " frequency spectrum " formed.
3, by the described digital random vibration control equipment of claim 1, the balanced update the system of its described " frequency spectrum ", include linear averaging device 4, exponential average device 5, comparer 6, random phase generator 7, predetermined reference frequency spectrum 8, corrector 9, frequency domain-time-domain spectral transducer 10, time-domain randomization generator 11, digital-to-analog converter 12, it is characterized in that it has a high precision gain amplifier 20 relevant with the oscillation intensity modified value, the fervent dental caries ň of its described Engel curve reef load ┚ rooms at the sides of or facing the principal rooms low timid of the deleting reef of the normal of that abandons pounces on Yan 1, predetermined reference root-mean-square value 22, comparer 17, high precision gain amplifier 20, multiplier 23 is formed.
4, by the described digital random vibration control equipment of claim 1, its described " frequency spectrum " balanced update the system, include linear averaging device 4, exponential average device 5, comparer 6, predetermined reference frequency spectrum 8, random phase generator 7, corrector 9, frequency domain-time-domain spectral transducer 10, time-domain randomization generator 11, D-A converter 12, it is characterized in that it has a software gain compensator 19 relevant with the oscillation intensity modified value, the balanced update the system of its described oscillation intensity (root-mean-square value) is by root mean square calculator 21, predetermined reference root-mean-square value 22, comparer 17, multiplier 23, software gain compensator 19, digital-to-analog converter 12 is formed.
5, by the described digital random vibration control equipment of claim 1, its described " frequency spectrum " balanced update the system is a spectral equalization system that does not wait degree of freedom, include the linear averaging device, the exponential average device, comparer 6, predetermined reference frequency spectrum 8, random phase generator 7, corrector 9, frequency domain-time-frequency spectrum transformation device 10, time-domain randomization generator 11, D-A converter 12, it is characterized in that it has a software gain compensator 19 relevant with the oscillation intensity modified value, and linear averaging device 14, but exponential average 15 all is variable freedoms, they and comparer 6, predetermined reference frequency spectrum 8, but overproof corrector 13 is formed the quick update the system of variable freedom, the balanced update the system of its described oscillation intensity (root-mean-square value) is by root mean square calculator 21, predetermined reference root-mean-square value 22, comparer 17, multiplier 23, software gain compensator 19, digital-to-analog converter 12 is formed.
6, by its described " frequency spectrum " balanced update the system of the described digital random vibration control equipment of claim 1 is a spectral equalization system that does not wait degree of freedom, include the linear averaging device, the exponential average device, comparer 6, predetermined reference frequency spectrum 8, random phase generator 7, corrector 9, frequency domain-time-frequency spectrum transformation device 10, time-domain randomization generator 11, D-A converter 12, it is characterized in that it has a high precision gain amplifier 20 relevant with the oscillation intensity modified value, and linear averaging device 14, but exponential average device 15 is variable freedoms, they and comparer 6, predetermined reference frequency spectrum 8, but overproof corrector 13 is formed a quick update the system of variable freedom again, the balanced update the system of its described oscillation intensity (root-mean-square value) is by root mean square calculator 21, predetermined reference root-mean-square value 22, comparer 17, multiplier 23, high precision gain amplifier 20 is formed.
7, by claim 3,4,5,6 described digital random vibration control equipments, it is characterized in that described oscillation intensity update the system has the correction link of a PID regulator or other DDC control algolithms.
8, by claim 5,6 described digital random vibration control equipments, but it is characterized in that the quick update the system of described variable freedom, the correction link of a PID regulator or other DDC control algolithms is arranged.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100465830C (en) * | 2007-02-09 | 2009-03-04 | 上海大学 | Portable vibration controller using USB interface |
| CN101832849A (en) * | 2010-04-09 | 2010-09-15 | 北京工业大学 | Method for controlling soft start of vibrating meter based on three-parameter control |
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1987
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100465830C (en) * | 2007-02-09 | 2009-03-04 | 上海大学 | Portable vibration controller using USB interface |
| CN101832849A (en) * | 2010-04-09 | 2010-09-15 | 北京工业大学 | Method for controlling soft start of vibrating meter based on three-parameter control |
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