CN102654754A - Method for detecting vibration control dynamic range by using load simulator and load simulator - Google Patents

Abstract

The invention discloses a method for detecting a vibration control dynamic range by using a load simulator, wherein the method comprises the following steps of: (1) designing a load simulator; (2) connecting a vibration controller, the load simulator and a vibration measuring system; and (3) detecting a vibration control dynamic range. The invention further discloses a load simulator for detecting the vibration control dynamic range, wherein the load simulator comprises a differentiating circuit, a second-order oscillating circuit and a wave trap, wherein the signal input end of the differentiating circuit inputs an output signal of the vibration controller, the signal output end of the differentiating circuit is connected with the signal input end of the second-order oscillating circuit, the signal output end of the second-order oscillating circuit is connected with the signal input end of the wave trap, and the signal output end of the wave trap outputs a measuring signal. By using the method and the load simulator disclosed by the invention to detect the vibration control dynamic range, the real working vibration situation of a vibrating table can be simulated, and the measured control dynamic range index has more practical significance; moreover, the method and the load simulator disclosed by the invention are simple in operations and convenient in debugging.

Description

Detect the method and the load simulator of vibration control dynamic range with load simulator

Technical field

The present invention relates to a kind of method and apparatus that detects the vibration control dynamic range, relate in particular to a kind of method and load simulator that detects the vibration control dynamic range with load simulator.

Background technology

Vibration environment is present in fields such as Aeronautics and Astronautics and communications and transportation.In the vibration environment, the wideband dynamic acceleration that product stands excites product resonance easily, causes the product cisco unity malfunction, can cause damage of product under the serious situation.Vibration test is used for the analog vibration environment, and in the design of product, development process, the environmental suitability of examination product is to optimize product design.China has formulated enforceable vibration test requirement to relevant industries such as Aeronautics and Astronautics and communications and transportation, and is corresponding, and China is also higher to the demand of vibration experiment.

Vibrating controller is the core control equipment of vibration test, and is with high content of technology, and especially the vibrating controller of high target has only a few producers such as DP, SD to grasp core technology at present in the world, possesses the development ability.In recent years Chinese domesticly also have several family units to possess vibrating controller development ability, but the technical indicator of equipment is compared a certain distance in addition with external advanced product, so high-end product needs dependence on import, and cost an arm and a leg.

Dynamic range is the important indicator of vibrating controller, has embodied the quality of control algolithm.The calibration method of JJG 948-1999 " digital electronic vibration experiment vertification regulation " regulation vibrating controller dynamic range is: carry out vibrating controller in suitable magnitude and control from closed loop; Signal output part connects dynamic signal analyzer; Dynamic signal analyzer adopts Hanning window function; The amplitude logarithmic coordinate, the measuring vibrations controller can be balanced dynamic range.

In the vibrating controller testing process, find: because high dynamic spectrum differs far away with actual controlled device characteristic; Its peak valley is steeper; Cause adopting high dynamic spectrum to detect the vibrating controller index that obtains and often be lower than the dynamic range that records in the actual vibration process of the test, thereby cause vibrating controller calibrating index to be lower than its virtual rating, purchase in the process at testing equipment; Need pay the more time cost and Geng Gao fund cost is purchased the vibrating controller that exceeds the test demand; Nonetheless, the true vibration situation that the control dynamic range index that records can not the work of complete reaction shaking table makes it detect that error is big, the practical application meaning is less.

Summary of the invention

The object of the invention provides a kind of method and load simulator that detects the vibration control dynamic range with load simulator with regard to being in order to address the above problem.

In order to achieve the above object, the present invention has adopted following technical scheme:

Method with load simulator detection vibration control dynamic range according to the invention may further comprise the steps: (1) design (calculated) load simulator; (2) connect vibrating controller, load simulator and Vibration-Measuring System; (3) detect the vibration control dynamic range.

Particularly, said step (1) may further comprise the steps:

1. the dynamic range of confirming load simulator is not less than 80dB;

2. confirm the frequency characteristic of load simulator: comprise a differentiation element, a second order oscillation element and a trapper link of series connection successively, the frequency function of said load simulator meets the following conditions:

$\mathrm{tf}\left(s\right)={\mathrm{tf}}_1\left(s\right)\×{\mathrm{tf}}_2\left(s\right)\×{\mathrm{tf}}_3\left(s\right)$

$=k_{1}s\&times;\frac{k_2{\mathrm{\&omega;}}_c^2}{s^2+{2\mathrm{\&xi;}}_1{\mathrm{\&omega;}}_{c}s+{\mathrm{\&omega;}}_c^2}\&times;\frac{k_3{\mathrm{\&omega;}}_{\mathrm{<figure-callout\; id="1"\; label="d\; s\; s"\; filenames="HDA0000154681470000013.png"\; state="\{\{state\}\}">d</figure-callout>}}s}{s^{}}$ (formula I)

Among the formula I, tf (s) is a load simulator system frequency function, tf ₁(s) be the differentiation element frequency function, tf ₂(s) be second order oscillation element frequency function, tf ₃(s) be trapper link frequency function, k ₁Be differentiation element scale-up factor, k ₂Be the gain of oscillatory circuit passband, k ₃Be the gain of notch filter circuit passband, ω _cBe resonant frequency, ω _dBe valley point frequency, ζ ₁Be second order resonant frequency ratio of damping, ζ ₂Be the trapper ratio of damping;

3. confirm the frequency characteristic parameter of load simulator: a, confirm frequency range: 5Hz～2kHz; B, confirm resonant frequency: the system resonance frequencies omega _cMeet the following conditions: $-20\&le;{10\mathrm{Log}}_2^{\frac{{\mathrm{\&omega;}}_c}{{\mathrm{\&omega;}}_l}}-20l{g}_2^{\frac{{\mathrm{\&omega;}}_h}{{\mathrm{\&omega;}}_c}}\&le;-3,$ ω wherein _hBe the upper limiting frequency of frequency range index, ω _lLower frequency limit for the frequency range index; C, confirm the valley point frequency: the valley point frequencies omega _dMeet the following conditions: 2 ω _c≤ω _d≤ω _hD, confirm second order resonant frequency ratio of damping: second order resonant frequency ratio of damping ζ ₁Scope be 0.01≤ζ ₁≤0.05; E, confirm the trapper ratio of damping: trapper ratio of damping ζ ₂Scope be 0.05≤ζ ₂≤0.2; F, confirm scale-up factor: 10≤k ₁≤100,1≤k ₂≤10,0.1≤k ₃≤1;

4. frequency characteristic stability is handled: after 3. a, the said step of foundation confirm each parameter; Bring the formula I of said step in 2. into and form the parameterized frequency characteristic of said load simulator; (MATLAB is the abbreviation of matrix experiment chamber Matrix Laboratory to adopt the MATLAB simulation Software Platform; Be the business mathematics software that U.S. MathWorks company produces, be used for the advanced techniques computational language and the interactive environment of algorithm development, data visualization, data analysis and numerical evaluation, mainly comprise MATLAB and Simulink two large divisions); Adopt order " tf () " to set up the frequency characteristic of differentiation element, second order oscillation element, trapper link respectively; The transport function that generates is multiplied each other in b, employing " series () " order becomes the transport function of load simulator; C, employing " bode () " order generate the transport function Bode diagram, and obtain system's phase frequency nargin and amplitude-frequency nargin; If 5. d phase frequency nargin and amplitude-frequency nargin then get into process step all greater than 0; Otherwise get back to step 3.;

5. according to step 3. described in the frequency characteristic parameter of load simulator accomplish the circuit design and the making of said load simulator.

The method of said step (2) is: the signal output part of said load simulator is connected with the measuring-signal input end of said vibrating controller; The drive signal output terminal of said vibrating controller and the signal input part of said load simulator are connected to form closed loop, and the signal input part of said load simulator is connected with the measuring junction of said Vibration-Measuring System respectively with signal output part.

The method of said step (3) is: utilize said Vibration-Measuring System that the load simulator input spectrum drv (f) and the output spectra ref (f) of acquisition and recording are calculated transport function spectrum H inv (f) by following formula:

$\mathrm{Hinv}\left(f\right)=\frac{\mathrm{Ref}\left(f\right)}{\mathrm{Drv}\left(f\right)}$ (formula II)

The said transport function spectrum H inv (f) that different vibration frequencies is corresponding different; Among all transport function spectrum H inv (f); The transport function spectrum H inv (f) of amplitude deducts the difference of the transport function spectrum H inv (f) of lowest amplitude, is said vibration control dynamic range.

Further, said step (1) is also wanted the confirmed test condition before, and said test is sine sweep test or random vibration test; The test condition of said sine sweep test is: frequency sweep spectrum shape: straight spectrum; Sine sweep amplitude: 1g, wherein g is 9.8m/s2; Frequency interval: 0.5Hz; Sweep rate: 1oct/min; Channel sensitivity: 20mv/g; Frequency range: 5Hz～2kHz; The test condition of said random vibration test is: power spectrum density spectrum shape: straight spectrum; Power spectrum density amplitude: 0.01g2/Hz, wherein g is 9.8m/s2, wherein g is 9.8m/s2; Power spectrum frequency interval: 0.5Hz; Channel sensitivity: 20mv/g; Frequency range: 5Hz～2kHz.

Load simulator according to the invention comprises differentiating circuit, second order oscillatory circuit and trapper; The output signal of the signal input part inputted vibration controller of said differentiating circuit; The signal output part of said differentiating circuit is connected with the signal input part of said second order oscillatory circuit; The signal output part of said second order oscillatory circuit is connected with the signal input part of said trapper, the signal output part output measuring-signal of said trapper.

Particularly; Said differentiating circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, first amplifier, second amplifier and the 3rd amplifier; First end of said first resistance is the signal input part of said differentiating circuit; Second end of said first resistance is connected with first end of the negative input of first amplifier, said first electric capacity and first end of said the 3rd resistance respectively; The electrode input end of said first amplifier ground connection behind said second resistance of connecting; The output terminal of said first amplifier second end, second end of the 3rd resistance and first end of said second electric capacity of said first electric capacity respectively is connected; Second end of said second electric capacity is connected with the negative input of second amplifier and first end of the 5th resistance respectively; Ground connection after the electrode input end of said second amplifier and the 3rd electric capacity and the 4th resistance are connected in parallel; The output terminal of said second amplifier is connected with second end of said the 5th resistance and first end of said the 6th resistance respectively; Second end of said the 6th resistance is connected with first end of the negative input of said the 3rd amplifier, said the 4th electric capacity and first end of said the 8th resistance respectively; Ground connection after the electrode input end of said the 3rd amplifier is connected with said the 7th resistance, the output terminal of said the 3rd amplifier is connected with second end of said the 4th electric capacity and second end of said the 8th resistance respectively, and the output terminal of said the 3rd amplifier is the signal output part of said differentiating circuit.

Said second order oscillatory circuit comprises the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 5th electric capacity, the 6th electric capacity, the 4th amplifier, the 5th amplifier and the 6th amplifier; First end of said the 9th resistance is the signal input part of said second order oscillatory circuit; Second end of said the 9th resistance is connected with first end of first end of said the 12 resistance, said the 15 resistance and the negative input of said the 4th amplifier respectively; The electrode input end of said the 4th amplifier is connected with first end of said the tenth resistance and first end of said the 11 resistance respectively; The second end ground connection of said the tenth resistance; The output terminal of said the 4th amplifier is connected with second end of said the 12 resistance and first end of said the 13 resistance respectively; Second end of said the 13 resistance respectively with first end of said the 5th electric capacity and said the 5th amplifier negative input be connected; The electrode input end ground connection of said the 5th amplifier; The output terminal of said the 5th amplifier is connected with first end of second end of said the 5th electric capacity, said the 14 resistance and second end of said the 11 resistance respectively; Second end of said the 14 resistance is connected with first end of said the 6th electric capacity and the negative input of said the 6th amplifier respectively; The electrode input end ground connection of the 6th amplifier, the output terminal of said the 6th amplifier are connected with second end of said the 6th electric capacity and second end of said the 15 resistance respectively, and the output terminal of said the 6th amplifier is the signal output part of said second order oscillatory circuit.

Said trapper comprises the 16 resistance, the 17 resistance, the 18 resistance, the 19 resistance, the 20 resistance, the 21 resistance, the 22 resistance, the 23 resistance, the 24 resistance, the 7th electric capacity, the 8th electric capacity, the 7th amplifier and the 8th amplifier; First end of said the 16 resistance is the signal input part of said trapper; Second end of said the 16 resistance is connected with first end of said the 7th electric capacity, first end of the 8th electric capacity and first end of said the 22 resistance respectively; Second end of said the 8th electric capacity is connected with the electrode input end of said the 7th amplifier and first end of said the 18 resistance respectively; The second end ground connection of said the 18 resistance; The negative input of said the 7th amplifier is connected with first end of said the 17 resistance and first end of said the 19 resistance respectively; The second end ground connection of said the 17 resistance; Second end of said the 19 resistance is connected with the output terminal of first end of said the 20 resistance, said the 7th amplifier and second end of said the 22 resistance respectively; Second end of said the 20 resistance is connected with first end of said the 21 resistance and the negative input of said the 8th amplifier respectively; The electrode input end of said the 8th amplifier is connected with first end of said the 23 resistance and first end of said the 24 resistance respectively, and second end of said the 23 resistance is connected with first end of said the 16 resistance, the second end ground connection of said the 24 resistance; The output terminal of said the 8th amplifier is connected with second end of said the 21 resistance, and the output terminal of said the 8th amplifier is the signal output part of said trapper.

Beneficial effect of the present invention is:

Adopt the present invention to detect the vibration control dynamic range, true vibration situation that can simulating vibration table work, the control dynamic range index that records has more practical significance, and the present invention is simple to operate, the debugging convenient.Be embodied as:

1, in the performance history of vibration control system; Particularly in the development stage; Adopt the work of load simulator simulating vibration table; Can reduce because the shaking table that the design defect of vibration control system causes damages risk, because load simulator is easy and simple to handle, so can improve the debugging efficiency of vibration control system.

2, through adopting and more approaching bringing onto load control mode and the supporting detection means of trystate; Actual response vibrating controller control ability more; In the examination of controller; More near the vibrating controller environment for use, indexs such as the control accuracy that records, dynamic range have more practical significance to the traditional controller of method ratio employing of employing load simulator test controller index from the closed loop method.

Description of drawings

Fig. 1 is that tradition is from closed loop acceleration power spectrum chart;

Fig. 2 is that the system of detection method according to the invention connects block diagram;

Fig. 3 is the detection synoptic diagram of vibration control dynamic range according to the invention;

Fig. 4 is the circuit diagram of load simulator according to the invention.

Embodiment

Below in conjunction with accompanying drawing the present invention is made further specific descriptions:

As shown in Figure 1; The calibration method of traditional JJG 948-1999 " digital electronic vibration experiment vertification regulation " regulation vibrating controller dynamic range is: carry out vibrating controller in suitable magnitude and control from closed loop; Signal output part connects dynamic signal analyzer; Dynamic signal analyzer adopts Hanning window function, amplitude logarithmic coordinate, the dynamic range that measuring vibrations controller institute can equilibrium.

High dynamic reference spectrum as shown in Figure 1 is carried out test, controls the dynamic range index of dynamic range as vibrating controller with the response of reality.Think: because high dynamic spectrum shown in Figure 1 differs far away with actual controlled device characteristic, its peak valley is steeper, causes the controller dynamic indicator to be underestimated.

As shown in Figure 1, in the vibration control process, relation below existing between controller drives spectrum drv (f), test specimen inverse transfer function Hinv (f) and the reference spectrum ref (f):

drv(f)＝ref(f)×Hinv(f)

Can know that by following formula the dynamic range that controller drives is required is determined by the dynamic range of reference spectrum and test specimen transport function jointly.In the actual test, the dynamic range of control spectrum usually is also little.Because the frequency characteristic of testpieces has higher dynamic range, just needs vibrating controller to have higher dynamic range, the reference mark response is controlled in the range of tolerable variance of test permission with assurance.

To sum up; Adopt high dynamic spectrum to detect the vibrating controller index that obtains and often be lower than the dynamic range that records in the actual vibration process of the test; Cause vibrating controller calibrating index to be lower than its virtual rating; Purchase in the process at testing equipment, pay the higher time and the fund cost is purchased the vibrating controller that exceeds the test demand.

Method with load simulator detection vibration control dynamic range according to the invention may further comprise the steps: (1) confirmed test condition, test of test and Selection sine sweep or random vibration test; The test condition of sine sweep test is: frequency sweep spectrum shape: straight spectrum; Sine sweep amplitude: 1g, wherein g is 9.8m/s2; Frequency interval: 0.5Hz; Sweep rate: loct/min; Channel sensitivity: 20mv/g; Frequency range: 5Hz～2kHz; The test condition of random vibration test is: power spectrum density spectrum shape: straight spectrum; Power spectrum density amplitude: 0.01g2/Hz, wherein g is 9.8m/s2, wherein g is 9.8m/s2; Power spectrum frequency interval: 0.5Hz; Channel sensitivity: 20mv/g; Frequency range: 5Hz～2kHz.(2) design (calculated) load simulator; (3) connect vibrating controller, load simulator and Vibration-Measuring System; (4) detect the vibration control dynamic range.

Specify below in conjunction with the step of concrete embodiment after the confirmed test condition:

Design (calculated) load simulator at first specifically may further comprise the steps:

1. the dynamic range of confirming load simulator is not less than 80dB, this be because: vibrating controller dynamic range index should be more than or equal to vibrating controller dynamic range index, and the dynamic range of advanced vibrating controller is 80dB at present;

2. confirm the frequency characteristic of load simulator: comprise a differentiation element, a second order oscillation element and a trapper link of series connection successively, the frequency function of said load simulator meets the following conditions:

$\mathrm{tf}\left(s\right)={\mathrm{tf}}_1\left(s\right)\&times;{\mathrm{tf}}_2\left(s\right)\&times;{\mathrm{tf}}_3\left(s\right)$

$=k_{1}s\&times;\frac{k_2{\mathrm{\&omega;}}_c^2}{s^2+{2\mathrm{\&xi;}}_1{\mathrm{\&omega;}}_{c}s+{\mathrm{\&omega;}}_c^2}\&times;\frac{k_3{\mathrm{\&omega;}}_{\mathrm{<figure-callout\; id="1"\; label="d\; s\; s"\; filenames="HDA0000154681470000013.png"\; state="\{\{state\}\}">d</figure-callout>}}s}{s^{}}$ (formula I)

Among the formula I, tf (s) is a load simulator system frequency function, tf ₁(s) be the differentiation element frequency function, tf ₂(s) be second order oscillation element frequency function, tf ₃(s) be trapper link frequency function, k ₁Be differentiation element scale-up factor, k ₂Be the gain of oscillatory circuit passband, k ₃Be the gain of notch filter circuit passband, ω _cBe resonant frequency, ω _dBe valley point frequency, ζ ₁Be second order resonant frequency ratio of damping, ζ ₂Be the trapper ratio of damping;

3. confirm the frequency characteristic parameter of load simulator: a, confirm frequency range: 5Hz～2kHz; B, confirm resonant frequency: system resonance frequencies omega c meets the following conditions: $-20\&le;{10\mathrm{Log}}_2^{\frac{{\mathrm{\&omega;}}_c}{{\mathrm{\&omega;}}_l}}-20l{g}_2^{\frac{{\mathrm{\&omega;}}_h}{{\mathrm{\&omega;}}_c}}\&le;-3,$ ω wherein _hBe the upper limiting frequency of frequency range index, ω _lLower frequency limit for the frequency range index; C, confirm the valley point frequency: the valley point frequencies omega _dMeet the following conditions: 2 ω _c≤ω _d≤ω _hD, confirm second order resonant frequency ratio of damping: second order resonant frequency ratio of damping ζ ₁Scope be 0.01≤ζ ₁≤0.05; E, confirm the trapper ratio of damping: trapper ratio of damping ζ ₂Scope be 0.05≤ζ ₂≤0.2; F, confirm scale-up factor: 10≤k ₁≤100,1≤k ₂≤10,0.1≤k ₃≤1;

4. frequency characteristic stability is handled: after 3. a, the said step of foundation confirm each parameter; Bring the formula I of said step in 2. into and form the parameterized frequency characteristic of said load simulator; Adopt the MATLAB simulation Software Platform; Adopt order " tf () " to set up the frequency characteristic of differentiation element, second order oscillation element, trapper link respectively; The transport function that generates is multiplied each other in b, employing " series () " order becomes the transport function of load simulator; C, employing " bode () " order generate the transport function Bode diagram, and obtain system's phase frequency nargin and amplitude-frequency nargin; If 5. d phase frequency nargin and amplitude-frequency nargin then get into process step all greater than 0; Otherwise get back to step 3.;

5. according to step 3. described in the frequency characteristic parameter of load simulator accomplish the circuit design and the making of said load simulator.

As shown in Figure 4; According to said method; The load simulator of confirming comprises differentiating circuit, second order oscillatory circuit and trapper, and the input signal Vi of the signal input part of said differentiating circuit is the output signal of vibrating controller, and the output signal Vo of the signal output part of said trapper is a measuring-signal.

As shown in Figure 4; Differentiating circuit comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the first amplifier A1, the second amplifier A2 and the 3rd amplifier A3; First end of first resistance R 1 is the signal input part of differentiating circuit; Second end of first resistance R 1 is connected with the negative input of the first amplifier A1, first end of first capacitor C 1 and first end of the 3rd resistance R 3 respectively; The electrode input end of the first amplifier A1, the second resistance R 2 back ground connection of connecting; The output terminal of the first amplifier A1 second end, second end of the 3rd resistance R 3 and first end of second capacitor C 2 of first capacitor C 1 respectively is connected; Second end of second capacitor C 2 is connected with the negative input of the second amplifier A2 and first end of the 5th resistance R 5 respectively; Ground connection after the electrode input end of the second amplifier A2 and the 3rd capacitor C 3 and the 4th resistance R 4 are connected in parallel; The output terminal of the second amplifier A2 is connected with second end of the 5th resistance R 5 and first end of the 6th resistance R 6 respectively; Second end of the 6th resistance R 6 is connected with the negative input of the 3rd amplifier A3, first end of the 4th capacitor C 4 and first end of the 8th resistance R 8 respectively, ground connection after the electrode input end of the 3rd amplifier A3 is connected with the 7th resistance R 7, and the output terminal of the 3rd amplifier A3 is connected with second end of the 4th capacitor C 4 and second end of the 8th resistance R 8 respectively.

As shown in Figure 4; The second order oscillatory circuit comprises the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R the 13, the 14 resistance R the 14, the 15 resistance R 15, the 5th capacitor C 5, the 6th capacitor C 6, the 4th amplifier A4, the 5th amplifier A5 and the 6th amplifier A6; First end of the 9th resistance R 9 is connected with the output terminal of the 3rd amplifier A3; Second end of the 9th resistance R 9 is connected with first end of the 12 resistance R 12, first end of the 15 resistance R 15 and the negative input of the 4th amplifier A4 respectively; The electrode input end of the 4th amplifier A4 is connected with first end of the tenth resistance R 10 and first end of the 11 resistance R 11 respectively; The second end ground connection of the tenth resistance R 10; The output terminal of the 4th amplifier A4 is connected with second end of the 12 resistance R 12 and first end of the 13 resistance R 13 respectively; Second end of the 13 resistance R 13 respectively with first end of the 5th capacitor C 5 and the 5th amplifier A5 negative input be connected; The electrode input end ground connection of the 5th amplifier A5, the output terminal of the 5th amplifier A5 are connected with second end of the 5th capacitor C 5, first end of the 14 resistance R 14 and second end of the 11 resistance R 11 respectively, and second end of the 14 resistance R 14 is connected with first end of the 6th capacitor C 6 and the negative input of the 6th amplifier A6 respectively; The electrode input end ground connection of the 6th amplifier A6, the output terminal of the 6th amplifier A6 are connected with second end of the 6th capacitor C 6 and second end of the 15 resistance R 15 respectively.

As shown in Figure 1; Trapper comprises the 16 resistance R the 16, the 17 resistance R the 17, the 18 resistance R the 18, the 19 resistance R the 19, the 20 resistance R the 20, the 21 resistance R the 21, the 22 resistance R the 22, the 23 resistance R the 23, the 24 resistance R 24, the 7th capacitor C 7, the 8th capacitor C 8, the 7th amplifier A7 and the 8th amplifier A8; First end of the 16 resistance R 16 is connected with the output terminal of the 6th amplifier A6; Second end of the 16 resistance R 16 is connected with first end of the 7th capacitor C 7, first end of the 8th capacitor C 8 and first end of the 22 resistance R 22 respectively; Second end of the 8th capacitor C 8 is connected with the electrode input end of the 7th amplifier A7 and first end of the 18 resistance R 18 respectively; The second end ground connection of the 18 resistance R 18; The negative input of the 7th amplifier A7 is connected with first end of the 17 resistance R 17 and first end of the 19 resistance R 19 respectively; The second end ground connection of the 17 resistance R 17; Second end of the 19 resistance R 19 is connected with first end of the 20 resistance R 20, the output terminal of the 7th amplifier A7 and second end of the 22 resistance R 22 respectively, and second end of the 20 resistance R 20 is connected with first end of the 21 resistance R 21 and the negative input of the 8th amplifier A8 respectively, and the electrode input end of the 8th amplifier A8 is connected with first end of the 23 resistance R 23 and first end of the 24 resistance R 24 respectively; Second end of the 23 resistance R 23 is connected with first end of the 16 resistance R 16; The second end ground connection of the 24 resistance R 24, the output terminal of the 8th amplifier A8 is connected with second end of the 21 resistance R 21, and the output terminal of the 8th amplifier A8 is the signal output part of trapper.

Among Fig. 1, the frequency characteristic parameter of load simulator is tried to achieve by following method respectively: differentiating circuit scale-up factor K1:1/R5C2; Second order oscillatory circuit passband gain K2:R12/R9; Trapper passband gain K3:0.5; Resonant frequency ω _c: 1/C4R13; Second order resonant frequency ratio of damping ζ ₁:

The valley point frequency

The trapper ratio of damping

Shown in resistance and electric capacity value see the following form among the figure:

R 1，R 2，R 3，R 4，R 6，R 7，R 8	2kΩ
		R 5	50kΩ
R 9	100kΩ
		R 10，R 11	100Ω
R 12，R 15	20kΩ
		R 13，R 14	5kΩ
R 16，R 17，R 18，R 19，R 22	10kΩ
		R 20，R 21，R 23R 24	2kΩ
C 1，C 3	100pf
		C 2，C 4，C 5	0.1uf
C 6	0.022uf
		C 7	0.47uf

As shown in Figure 2; Make after the load simulator; Connect vibrating controller, load simulator and Vibration-Measuring System by following method: the signal output part of load simulator is connected with the measuring-signal input end of vibrating controller; The drive signal output terminal of vibrating controller and the signal input part of load simulator are connected to form closed loop, and the signal input part of load simulator is connected with the measuring junction of Vibration-Measuring System respectively with signal output part.

As shown in Figure 3; Begin to detect the vibration control dynamic range at last, its method is: utilize said Vibration-Measuring System that the load simulator input spectrum drv (f) and the output spectra ref (f) of acquisition and recording are calculated transport function spectrum H inv (f) by following formula:

$\mathrm{Hinv}\left(f\right)=\frac{\mathrm{Ref}\left(f\right)}{\mathrm{Drv}\left(f\right)}$ (formula II)

The longitudinal axis is represented transport function spectrum H inv (f) among Fig. 3; Transverse axis is represented vibration frequency; The corresponding different transmission spectrum of function Hinv (f) of different vibration frequencies; Among all transport function spectrum H inv (f), the transport function spectrum H inv (f) of amplitude deducts the difference of the transport function spectrum H inv (f) of lowest amplitude, is the vibration control dynamic range.Among Fig. 3: the transport function spectrum H inv (f) of amplitude is Max=61.7086, and the transport function spectrum H inv (f) of lowest amplitude is Min=-19.8194, vibration control dynamic range=61.7086-(19.8194)=81.528.

Claims (9)

1. the method with load simulator detection vibration control dynamic range is characterized in that: may further comprise the steps: (1) design (calculated) load simulator; (2) connect vibrating controller, load simulator and Vibration-Measuring System; (3) detect the vibration control dynamic range.

2. the method with load simulator detection vibration control dynamic range according to claim 1, it is characterized in that: said step (1) may further comprise the steps:

1. the dynamic range of confirming load simulator is not less than 80dB;

2. confirm the frequency characteristic of load simulator: comprise a differentiation element, a second order oscillation element and a trapper link of series connection successively, the frequency function of said load simulator meets the following conditions:

$\mathrm{tf}\left(s\right)={\mathrm{tf}}_1\left(s\right)\&times;{\mathrm{tf}}_2\left(s\right)\&times;{\mathrm{tf}}_3\left(s\right)$

$=k_{1}s\&times;\frac{k_2{\mathrm{\&omega;}}_c^2}{s^2+{2\mathrm{\&xi;}}_1{\mathrm{\&omega;}}_{c}s+{\mathrm{\&omega;}}_c^2}\&times;\frac{k_3{\mathrm{\&omega;}}_{d}s}{s^1+{2\mathrm{\&xi;}}_2{\mathrm{\&omega;}}_{d}s+{\mathrm{\&omega;}}_d^2}$ (formula I)

Among the formula I, tf (s) is a load simulator system frequency function, tf ₁(s) be the differentiation element frequency function, tf ₂(s) be second order oscillation element frequency function, tf ₃(s) be trapper link frequency function, k ₁Be differentiation element scale-up factor, k ₂Be the gain of oscillatory circuit passband, k ₃Be the gain of notch filter circuit passband, ω _cBe resonant frequency, ω _dBe valley point frequency, ζ ₁Be second order resonant frequency ratio of damping, ζ ₂Be the trapper ratio of damping;

3. confirm the frequency characteristic parameter of load simulator: a, confirm frequency range: 5Hz～2kHz; B, confirm resonant frequency: the system resonance frequencies omega _cMeet the following conditions: $-20\&le;{10\mathrm{Log}}_2^{\frac{{\mathrm{\&omega;}}_c}{{\mathrm{\&omega;}}_l}}-20l{g}_2^{\frac{{\mathrm{\&omega;}}_h}{{\mathrm{\&omega;}}_c}}\&le;-3,$ ω wherein _hBe the upper limiting frequency of frequency range index, ω _lLower frequency limit for the frequency range index; C, confirm the valley point frequency: the valley point frequencies omega _dMeet the following conditions: 2 ω _c≤ω _d≤ω _hD, confirm second order resonant frequency ratio of damping: second order resonant frequency ratio of damping ζ ₁Scope be 0.01≤ζ ₁≤0.05; E, confirm the trapper ratio of damping: trapper ratio of damping ζ ₂Scope be 0.05≤ζ ₂≤0.2; F, confirm scale-up factor: 10≤k ₁≤100,1≤k ₂≤10,0.1≤k ₃≤1;

4. frequency characteristic stability is handled: after 3. a, the said step of foundation confirm each parameter; Bring the formula I of said step in 2. into and form the parameterized frequency characteristic of said load simulator; Adopt the MATLAB simulation Software Platform; Adopt order " tf () " to set up the frequency characteristic of differentiation element, second order oscillation element, trapper link respectively; The transport function that generates is multiplied each other in b, employing " series () " order becomes the transport function of load simulator; C, employing " bode () " order generate the transport function Bode diagram, and obtain system's phase frequency nargin and amplitude-frequency nargin; If 5. d phase frequency nargin and amplitude-frequency nargin then get into process step all greater than 0; Otherwise get back to step 3.;

5. according to step 3. described in the frequency characteristic parameter of load simulator accomplish the circuit design and the making of said load simulator.

3. the method that detects the vibration control dynamic range with load simulator according to claim 1; It is characterized in that: the method for said step (2) is: the signal output part of said load simulator is connected with the measuring-signal input end of said vibrating controller; The drive signal output terminal of said vibrating controller and the signal input part of said load simulator are connected to form closed loop, and the signal input part of said load simulator is connected with the measuring junction of said Vibration-Measuring System respectively with signal output part.

4. the method with load simulator detection vibration control dynamic range according to claim 1, it is characterized in that: the method for said step (3) is: utilize said Vibration-Measuring System that the load simulator input spectrum drv (f) and the output spectra ref (f) of acquisition and recording are calculated transport function spectrum H inv (f) by following formula:

$\mathrm{Hinv}\left(f\right)=\frac{\mathrm{Ref}\left(f\right)}{\mathrm{Drv}\left(f\right)}$ (formula II)

The said transport function spectrum H inv (f) that different vibration frequencies is corresponding different; Among all transport function spectrum H inv (f); The transport function spectrum H inv (f) of amplitude deducts the difference of the transport function spectrum H inv (f) of lowest amplitude, is said vibration control dynamic range.

5. the method with load simulator detection vibration control dynamic range according to claim 1, it is characterized in that: said step (1) is also wanted the confirmed test condition before, and said test is sine sweep test or random vibration test; The test condition of said sine sweep test is: frequency sweep spectrum shape: straight spectrum; Sine sweep amplitude: 1g, wherein g is 9.8m/s2; Frequency interval: 0.5Hz; Sweep rate: loct/min; Channel sensitivity: 20mv/g; Frequency range: 5Hz～2kHz; The test condition of said random vibration test is: power spectrum density spectrum shape: straight spectrum; Power spectrum density amplitude: 0.01g2/Hz, wherein g is 9.8m/s2, wherein g is 9.8m/s2; Power spectrum frequency interval: 0.5Hz; Channel sensitivity: 20mv/g; Frequency range: 5Hz～2kHz.

6. load simulator of adopting of method according to claim 1; It is characterized in that: comprise differentiating circuit, second order oscillatory circuit and trapper; The output signal of the signal input part inputted vibration controller of said differentiating circuit; The signal output part of said differentiating circuit is connected with the signal input part of said second order oscillatory circuit, and the signal output part of said second order oscillatory circuit is connected with the signal input part of said trapper, the signal output part output measuring-signal of said trapper.

7. load simulator according to claim 6; It is characterized in that: said differentiating circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, first amplifier, second amplifier and the 3rd amplifier; First end of said first resistance is the signal input part of said differentiating circuit; Second end of said first resistance is connected with first end of the negative input of first amplifier, said first electric capacity and first end of said the 3rd resistance respectively; The electrode input end of said first amplifier ground connection behind said second resistance of connecting; The output terminal of said first amplifier second end, second end of the 3rd resistance and first end of said second electric capacity of said first electric capacity respectively is connected; Second end of said second electric capacity is connected with the negative input of second amplifier and first end of the 5th resistance respectively; Ground connection after the electrode input end of said second amplifier and the 3rd electric capacity and the 4th resistance are connected in parallel; The output terminal of said second amplifier is connected with second end of said the 5th resistance and first end of said the 6th resistance respectively; Second end of said the 6th resistance is connected with first end of the negative input of said the 3rd amplifier, said the 4th electric capacity and first end of said the 8th resistance respectively; Ground connection after the electrode input end of said the 3rd amplifier is connected with said the 7th resistance, the output terminal of said the 3rd amplifier is connected with second end of said the 4th electric capacity and second end of said the 8th resistance respectively, and the output terminal of said the 3rd amplifier is the signal output part of said differentiating circuit.

8. load simulator according to claim 6; It is characterized in that: said second order oscillatory circuit comprises the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 5th electric capacity, the 6th electric capacity, the 4th amplifier, the 5th amplifier and the 6th amplifier; First end of said the 9th resistance is the signal input part of said second order oscillatory circuit; Second end of said the 9th resistance is connected with first end of first end of said the 12 resistance, said the 15 resistance and the negative input of said the 4th amplifier respectively; The electrode input end of said the 4th amplifier is connected with first end of said the tenth resistance and first end of said the 11 resistance respectively; The second end ground connection of said the tenth resistance; The output terminal of said the 4th amplifier is connected with second end of said the 12 resistance and first end of said the 13 resistance respectively; Second end of said the 13 resistance respectively with first end of said the 5th electric capacity and said the 5th amplifier negative input be connected; The electrode input end ground connection of said the 5th amplifier; The output terminal of said the 5th amplifier is connected with first end of second end of said the 5th electric capacity, said the 14 resistance and second end of said the 11 resistance respectively, and second end of said the 14 resistance is connected with first end of said the 6th electric capacity and the negative input of said the 6th amplifier respectively, the electrode input end ground connection of the 6th amplifier; The output terminal of said the 6th amplifier is connected with second end of said the 6th electric capacity and second end of said the 15 resistance respectively, and the output terminal of said the 6th amplifier is the signal output part of said second order oscillatory circuit.

9. load simulator according to claim 6; It is characterized in that: said trapper comprises the 16 resistance, the 17 resistance, the 18 resistance, the 19 resistance, the 20 resistance, the 21 resistance, the 22 resistance, the 23 resistance, the 24 resistance, the 7th electric capacity, the 8th electric capacity, the 7th amplifier and the 8th amplifier; First end of said the 16 resistance is the signal input part of said trapper; Second end of said the 16 resistance is connected with first end of said the 7th electric capacity, first end of the 8th electric capacity and first end of said the 22 resistance respectively; Second end of said the 8th electric capacity is connected with the electrode input end of said the 7th amplifier and first end of said the 18 resistance respectively; The second end ground connection of said the 18 resistance; The negative input of said the 7th amplifier is connected with first end of said the 17 resistance and first end of said the 19 resistance respectively; The second end ground connection of said the 17 resistance; Second end of said the 19 resistance is connected with the output terminal of first end of said the 20 resistance, said the 7th amplifier and second end of said the 22 resistance respectively; Second end of said the 20 resistance is connected with first end of said the 21 resistance and the negative input of said the 8th amplifier respectively; The electrode input end of said the 8th amplifier is connected with first end of said the 23 resistance and first end of said the 24 resistance respectively, and second end of said the 23 resistance is connected with first end of said the 16 resistance, the second end ground connection of said the 24 resistance; The output terminal of said the 8th amplifier is connected with second end of said the 21 resistance, and the output terminal of said the 8th amplifier is the signal output part of said trapper.

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