CN205662571U - Online quantification evaluation system of vibration prescription effect - Google Patents
Online quantification evaluation system of vibration prescription effect Download PDFInfo
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- CN205662571U CN205662571U CN201620371302.4U CN201620371302U CN205662571U CN 205662571 U CN205662571 U CN 205662571U CN 201620371302 U CN201620371302 U CN 201620371302U CN 205662571 U CN205662571 U CN 205662571U
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Abstract
Online quantification evaluation system of vibration prescription effect is including host computer system, signal generator, driver, vibration exciter, acceleration sensor, charge amplifier, oscilloscope, strutting arrangement, work piece and vibration exciter fixed connection to the adoption has elastic strutting arrangement and supports the work piece, host computer system control signal generator output amplitude and frequency be the sinusoidal excitation signal of independent and continuously adjustable all, the host computer system includes that exciting frequency acquires the module, and the module is acquireed to the excitation time, and voltage waveform acquires the module, and voltage draws the module, grade conversion module that shakes, excitation amplitude conversion module, dimensionless processing module to it sets up the module to reach vibration prescription effect and dimensionless exciting frequency, dimensionless excitation amplitude, the correlation between the dimensionless excitation time. The utility model has the advantages of pairing vibration prescription effect can be realized and the evaluation of online quantification is carried out.
Description
Technical field
This utility model relates to vibration aging technology field, refers in particular to the online quantitative evaluation system of a kind of effect of vibration stress relief
System and method.
Background technology
The evaluation of effect of vibration stress relief is one of key issue of vibration aging technology area research, so-called oscillating aging effect
Fruit refers to the effect of Relieving Residual Stress in Libration.The evaluation methodology of effect of vibration stress relief at present specifically includes that parameter curve
Method, residual stress measurement method and precision stability detection method.
(1) parameter curve method: parameter curve method is, according to parameter during oscillating aging, regular variation phenomenon occurs
Sum up out, it is possible to the effect of vibration aging technology is carried out online qualitative evaluation, and interpretational criteria used specifically includes that and shakes
After dynamic Ageing Treatment, the resonance peak of frequency sweep curve raises than before vibration stress relief treatment；After vibration stress relief treatment, frequency sweep curve is total to
Vibration frequency reduces than before vibration stress relief treatment；Narrow before the bandwidth ratio vibration stress relief treatment of frequency sweep curve after vibration stress relief treatment.
Although parameter curve method be one online, intuitively, method quickly and easily, but this method can only be to the effect of oscillating aging
Describe qualitatively, and can not the evaluation result of quantitative.(2) residual stress measurement method: shake to evaluate accurately
Dynamic ageing technique eliminates the effect of residual stress, it is necessary to the residual stress before and after assessment component oscillating aging exactly, but
The residual stress distribution situation of component inside, particularly the distribution of some complex component internal residual stress, it is difficult with
The method of Theoretical Calculation is analyzed solving, so the residual stress that the method using experiment to measure assesses component inside has non-
The most important realistic meaning.The experimental measurement method of residual stress mainly includes lossless physical measurement method and the machine damaged at present
Tool measurement method, it is possible to the residual stress before and after the assessment component vibration stress relief treatment of off-line.Residual stress measurement is owned by France in off-line
Evaluation methodology, after oscillating aging process terminates, effect of vibration stress relief can only be evaluated.(3) precision stability detection
Method: precision stability detection method be by detection means vibration stress relief treatment after precision evaluate the effect of vibration aging technology
Really, it is possible to the effect of vibration aging technology is carried out off-line and evaluates qualitatively, mainly include placing precision method for a long time, adding dynamic loading
Rear precision method etc..Long-term precision method of placing is to be placed for a long time by the component after vibration stress relief treatment and periodic detection component
Dimensional stability, concrete operations flow process is for the first time detection when placing 15 days, and once every detection in 30 days, total puts later
The time of putting should be more than half a year；After adding dynamic loading, precision method is that detection component after vibration stress relief treatment is made in dynamic loading
The variable quantity of the dimensional accuracy after with.Precision stability detection method falls within off-line, qualitatively evaluation methodology, and this side
The assessment cycle that method needs is the longest.In sum, although we are it is seen that the effect of oscillating aging can be entered by these methods
The evaluation that row is qualitative or quantitative, but all the effect of oscillating aging cannot be carried out online quantitative evaluation.
Utility model content
In order to overcome the evaluation methodology of existing effect of vibration stress relief cannot realize the online quantitative evaluation of effect of vibration stress relief
Deficiency, the utility model proposes the online quantitative evaluation system and method for a kind of effect of vibration stress relief.
The online quantitative evaluation system of effect of vibration stress relief, including master system, signal generator, driver, swashs
Shake device, acceleration transducer, charge amplifier, oscillograph, support means；Workpiece is fixing with vibrator to be connected, and uses tool
Workpiece is supported by resilient support means；Master system control signal generator output amplitude and frequency all independent and
Continuously adjustable sine excitation signal；The sine excitation signal of signal generator output inputs vibrator via driver, thus
Vibrator is driven to produce vibration；Acceleration transducer is arranged on workpiece, the outfan of acceleration transducer and charge amplifier
Input channel connect, the output channel of charge amplifier is connected with oscillograph, and oscillograph is connected with master system.
Master system includes the excited frequency f acquisition module obtaining excited frequency f (kHz) of oscillating aging, and acquisition is shaken
The exciting time t acquisition module of exciting time t (min) of dynamic timeliness, obtains the voltage waveform of the voltage waveform of oscilloscope display
Acquisition module, obtains the voltage subtraction module of voltage peak U (V) from voltage waveform, and voltage peak is converted to adding of output
Speed is shaken a grade a (ms-2) grade a modular converter that shakes, grade a that shaken by the acceleration of output is converted to the exciting amplitude A (μ of oscillating aging
M) exciting amplitude A modular converter, is carried out excited frequency f, exciting amplitude A, exciting time t at the dimensionless of dimensionless process
Reason module, and effect of vibration stress relief F and dimensionless excited frequencyDimensionless exciting amplitudeThe dimensionless exciting timeIt
Between mutual relation module is set.
Shake and grade modular converter is preset with the Sensitirity va1ue s (pC/ms of acceleration transducer-2), charge amplifier input is logical
The sensitivity coefficient S (pC/Unit) in road, amplification coefficient K (Unit/V)；Output acceleration shake between level and voltage peak turn
The relation of changing is:The acceleration transformational relation between level and exciting amplitude that shakes of output is:Dimensionless processing module is preset with excited frequency f and dimensionless excited frequencyBetween transformational relationExciting amplitude A and dimensionless exciting amplitudeBetween transformational relationAnd exciting time t is with immeasurable
The guiding principle exciting timeBetween transformational relationWherein f0For 1kHz, A0It is 1 μm, t0For 1min.
Further, acceleration transducer is piezoelectric acceleration transducer.
Further, support means is flexible member.
Technology of the present utility model design is: passed by master system, signal generator, driver, vibrator, acceleration
Sensor, charge amplifier and oscillograph constitute the online quantitative evaluation system of effect of vibration stress relief；By workpiece and vibrator
Fixing connection；Use support means that workpiece is supported, in order to vibrator carries out exciting to workpiece；Master system obtains in real time
Take dimensionless excited frequencyDimensionless exciting amplitudeAnd the dimensionless exciting timeAnd according to effect of vibration stress relief F with
Dimensionless excited frequencyDimensionless exciting amplitudeThe dimensionless exciting timeBetween mutual relation, to oscillating aging imitate
Fruit carries out the evaluation of online quantification.
The beneficial effects of the utility model are:
1, the charge signal that acceleration transducer exports can be converted to acceleration shake level, and then level of being shaken by acceleration turns
It is changed to exciting amplitude, knows the exciting amplitude acted on workpiece in real time, exactly.
2, effect of vibration stress relief F and dimensionless excited frequency can be set upDimensionless exciting amplitudeAnd dimensionless swashs
Shake the timeBetween quantification functional relationship, it is possible to realize effect of vibration stress relief carried out the evaluation of online quantification.
3, master system can obtain dimensionless excited frequency automaticallyDimensionless exciting amplitudeAnd dimensionless swashs
Shake the timeRealize effect of vibration stress relief is carried out the evaluation of online quantification, it is not necessary to manual operation, decrease workload, improve
Work efficiency.
Accompanying drawing explanation
The online quantitative evaluation system of Fig. 1 effect of vibration stress relief
The scale diagrams of Fig. 2 Cr12MoV steel curved beam
Detailed description of the invention
Referring to the drawings, this utility model is further illustrated:
The online quantitative evaluation system of effect of vibration stress relief, including master system, signal generator, driver, swashs
Shake device 1, acceleration transducer 2, charge amplifier, oscillograph, support means 4；Workpiece 3 is fixing with vibrator 1 to be connected, and adopts
Workpiece 3 is supported by the resilient support means of apparatus 4；Master system control signal generator output amplitude and frequency are equal
Independent and continuously adjustable sine excitation signal；The sine excitation signal of signal generator output inputs exciting via driver
Device 1, thus drive vibrator 1 to produce vibration；Acceleration transducer 2 is arranged on workpiece 3, the outfan of acceleration transducer 2
Being connected with the input channel of charge amplifier, the output channel of charge amplifier is connected with oscillograph, oscillograph and host computer system
System connects.
Master system includes the excited frequency f acquisition module obtaining excited frequency f (kHz) of oscillating aging, and acquisition is shaken
The exciting time t acquisition module of exciting time t (min) of dynamic timeliness, obtains the voltage waveform of the voltage waveform of oscilloscope display
Acquisition module, obtains the voltage subtraction module of voltage peak U (V) from voltage waveform, and voltage peak is converted to adding of output
Speed is shaken a grade a (ms-2) grade a modular converter that shakes, grade a that shaken by the acceleration of output is converted to the exciting amplitude A (μ of oscillating aging
M) exciting amplitude A modular converter, is carried out excited frequency f, exciting amplitude A, exciting time t at the dimensionless of dimensionless process
Reason module, and effect of vibration stress relief F and dimensionless excited frequencyDimensionless exciting amplitudeThe dimensionless exciting timeIt
Between mutual relation module is set.
Shake and grade modular converter is preset with the Sensitirity va1ue s (pC/ms of acceleration transducer 2-2), charge amplifier input is logical
The sensitivity coefficient S (pC/Unit) in road, amplification coefficient K (Unit/V)；Output acceleration shake between level and voltage peak turn
The relation of changing is:The acceleration transformational relation between level and exciting amplitude that shakes of output is:Dimensionless processing module is preset with excited frequency f and dimensionless excited frequencyBetween transformational relationExciting amplitude A and dimensionless exciting amplitudeBetween transformational relationAnd exciting time t is with immeasurable
The guiding principle exciting timeBetween transformational relationWherein f0For 1kHz, A0It is 1 μm, t0For 1min.
Further, acceleration transducer 2 is piezoelectric acceleration transducer.
Further, support means 4 is flexible member.
The online quantitative evaluation methods of effect of vibration stress relief comprises the following steps:
(1), it is connected fixing with vibrator 1 for workpiece 3；Use support means 4 that workpiece 3 is supported, in order to vibrator 1
Workpiece 3 is carried out exciting；Connect the signal link between master system and signal generator；Connect signal generator and driving
Signal link between device；Connect the signal link between driver and vibrator 1；Connect between master system and oscillograph
Signal link；Connect the signal link between oscillograph and charge amplifier；Connect charge amplifier and acceleration transducer 2
Between signal link；Connect master system, signal generator, driver, vibrator 1, oscillograph, the electricity of charge amplifier
Source.
(2), the Sensitirity va1ue s (pC/ms of acceleration transducer 2 is set in grade modular converter that shakes-2)；Charge amplifier is defeated
Enter the sensitivity coefficient S (pC/Unit) of passage, amplification coefficient K (Unit/V).
(3), excited frequency acquisition module obtains excited frequency f (kHz) of oscillating aging；Exciting time-obtaining module obtains
Exciting time t (min) of oscillating aging；Voltage waveform acquisition module obtains the voltage waveform of oscilloscope display；Voltage subtraction mould
Block obtains voltage peak U (V) from voltage waveform；The acceleration of output in grade modular converter that shakes shakes between level and voltage peak
Transformational relation isIn exciting amplitude modular converter, exciting amplitude and the acceleration of output shake between level
Transformational relation is
(4), dimensionless processing module excited frequency f, exciting amplitude A and exciting time t are carried out dimensionless process, tool
Excited frequency f of body and dimensionless excited frequencyBetween transformational relation beExciting amplitude A and dimensionless exciting
AmplitudeBetween transformational relation beAnd exciting time t and dimensionless exciting timeBetween transformational relation beWherein f0For 1kHz, A0It is 1 μm, t0For 1min.
(5), in effect of vibration stress relief F and dimensionless excited frequencyDimensionless exciting amplitudeThe dimensionless exciting timeBetween mutual relation arrange module is arranged F withBetween mutual relation be F (f, A, t), and by step
(4) the dimensionless excited frequency obtained in real time inDimensionless exciting amplitudeAnd the dimensionless exciting timeSubstitution F (f, A,
T) i.e. effect of vibration stress relief can be carried out the evaluation of online quantification in.
In step (5), obtain effect of vibration stress relief F and dimensionless excited frequencyDimensionless exciting amplitudeDimensionless
The exciting timeBetween mutual relation expression formula F (f, A, t) comprise the following steps:
(5.1), effect of vibration stress relief F and dimensionless excited frequencyDimensionless exciting amplitudeThe dimensionless exciting timeBetween mutual relation expression formula F (f, A, t) can approach with following multinomial:In formula: a1、a2、…、a11For real coefficient,
Wherein a11Constant term for equation.
(5.2), when workpiece 3 is without vibration stress relief treatment, when i.e. the value of three technological parameters is 0, workpiece 3
Residual stress eradicating efficacy should be 0, so constant term a11=0.Therefore, F (f, A, t) can be further represented as:
(5.3), 10 groups of different dimensionless combination of process parameters and their corresponding effect of vibration stress relief F are substituted into
(f, A t) can obtain about undetermined coefficient a F1、a2、…、a1010 yuan of 1 equation of n th order n group, the most permissible by solving this equation group
Solve the numerical value of these 10 undetermined coefficients.This 10 yuan of 1 equation of n th order n group uses the form of matrix to be expressed as:
Can be further represented as: Ga=F.
In formula:For dimensionless combination of process parameters matrix, the i-th row in this matrix
The combination multinomial of dimensionless technological parameter during expression i & lt vibration stress relief treatment；F=[Fi] it is the effect square of oscillating aging
Battle array；A=[ai] it is undetermined coefficient matrix.
(5.4), in order to solve 10 undetermined coefficients, 10 groups of different experimental datas are at least needed, so that step
(5.3) matrix equation in has unique solution, then the order of dimensionless combination of process parameters matrix G should meet r (G)=10, i.e. without
Dimension combination of process parameters matrix should be non-singular matrix.Therefore, undetermined coefficient can be solved by following matrix equation and obtain:
Solve 10 are treated
(f, A t), i.e. can set up effect of vibration stress relief F and dimensionless excited frequency to determine expression formula F in coefficient substitution step (5.2)Dimensionless exciting amplitudeThe dimensionless exciting timeBetween mutual relation expression formula F (f, A, t).
Obtain effect of vibration stress relief F and dimensionless excited frequencyDimensionless exciting amplitudeThe dimensionless exciting time
Between the details that is embodied as of expression formula of mutual relation be: assume function F (f, A, definition territory t) is bounded closed region D,
And be real-valued continuous function in the D of this region.P1(f,A,t)、P2(f,A,t)、…、Pk(f, A t) are k the line being defined on D
The real-valued continuous function (being usually taken to be multinomial function) that property is unrelated, wherein by P1(f,A,t)、P2(f,A,t)、…、Pk
(f, A, t) linear space P that combination is made is referred to as linear interpolation space, then in P, arbitrary function can be expressed as: P (f, A, t)
=α1P1(f,A,t)+α2P2(f,A,t)+…+αkPk(f, A, t),
In formula: α1、α2、…、αkFor real coefficient.According to Weierstrass approximation theorem, if function P (t) may be used by f, A
With for approximating function F (f, A, t), then for any given ε, have | F (f, A, t)-P (f, A, t) | ＜ ε, wherein f, A, t ∈
D.Therefore, this utility model is intended to by dimensionless excited frequencyDimensionless exciting amplitudeWith the dimensionless exciting timeThis
The multinomial function of three technological parameter compositions, uses multivariate function approximation theory to approach and sets up out effect of vibration stress relief F
With dimensionless excited frequencyDimensionless exciting amplitudeThe dimensionless exciting timeBetween expression formula F of mutual relation
(f,A,t)。
In order to obtain set up expression formula F (f, A, t) needed for experimental data, the sample shown in Fig. 2 is carried out oscillating aging
Process.In order to solve expression formula F that step (5.2) sets up (f, A, t) in 10 undetermined coefficients, need to select 10 groups
Different experimental datas, and dimensionless combination of process parameters matrix is necessary for non-singular matrix, i.e. dimensionless combination of process parameters square
Rank of matrix is 10.In view of experimental data test process exists certain error, in order to improve foundation expression formula F (f, A,
T) having higher reliability and universality, (f, A t), are shown in Table 1 for setting up expression formula F to choose 11 groups of experimental datas.Successively
Choose from 11 groups of experimental datas therein 10 groups for constructing dimensionless combination of process parameters matrix G, and specify rj(G) for going
After falling the jth group data in 11 groups of experimental datas, the order of the dimensionless combination of process parameters matrix G constructed, j=1～11.
The rank function in Matlab software is used to calculate the order of constructed dimensionless combination of process parameters matrix G successively, if asking
Solve result and meet r1(G)=r2(G)=...=r11(G)=10, then the experimental data of description selection may be used for solving 11 groups
Undetermined coefficient, if solving result is unsatisfactory for r1(G)=r2(G)=...=r11(G) during=10 this condition, then need to reselect
Experimental data.
Table 1 is for calculating dimensionless technological parameter and the timeliness effect of undetermined coefficient matrix
During solving 10 undetermined coefficients, choose from 11 groups of experimental datas first every time 10 set constructors therein without
Dimension combination of process parameters matrix G；Secondly the inv function in Matlab software is used to solve dimensionless combination of process parameters square
Inverse matrix G of battle array G-1, and by matrix G in Matlab software-1It is multiplied with the effect matrix F of oscillating aging and i.e. can solve
Undetermined coefficient matrix, so can obtain 11 groups of different undetermined coefficients；Then these 11 groups of undetermined coefficients are taken it respectively average
Value is as expression formula F (f, A, undetermined coefficient t)；Finally the average of these undetermined coefficients is substituted into the table that step (5.2) is set up
(f, A t) i.e. can obtain effect of vibration stress relief F and dimensionless excited frequency to reach formula FDimensionless exciting amplitudeDimensionless
The exciting timeBetween mutual relation expression formula F (f, A, t).
Table 2 is the 11 groups of undetermined coefficients solved.Last of table 2 is classified as the average of 11 groups of undetermined coefficients, these is treated
Determine the average of coefficient to substitute into expression formula F that step (5.2) sets up (f, A, t), then the final effect of vibration stress relief F set up is with immeasurable
Guiding principle excited frequencyDimensionless exciting amplitudeThe dimensionless exciting timeBetween expression formula F of mutual relation (f, A t) may be used
To be expressed as:
Each numerical value organizing undetermined coefficient that table 2 solves
Content described in this specification embodiment is only enumerating of the way of realization to utility model design, and this practicality is new
The protection domain of type is not construed as being only limitted to the concrete form that embodiment is stated, protection domain of the present utility model also and
In those skilled in the art according to this utility model design it is conceivable that equivalent technologies means.
Claims (3)
1. the online quantitative evaluation system of effect of vibration stress relief, including master system, signal generator, driver, exciting
Device, acceleration transducer, charge amplifier, oscillograph, support means；Workpiece is fixing with vibrator to be connected, and employing has
Workpiece is supported by elastic support means；Master system control signal generator output amplitude and frequency are all independent and connect
Continuous adjustable sine excitation signal；The sine excitation signal of signal generator output inputs vibrator via driver, thus drives
Dynamic vibrator produces vibration；Acceleration transducer is arranged on workpiece, the outfan of acceleration transducer and charge amplifier
Input channel connects, and the output channel of charge amplifier is connected with oscillograph, and oscillograph is connected with master system.
2. the online quantitative evaluation system of effect of vibration stress relief as claimed in claim 1, it is characterised in that: acceleration sensing
Device is piezoelectric acceleration transducer.
3. the online quantitative evaluation system of effect of vibration stress relief as claimed in claim 2, it is characterised in that: support means is
Flexible member.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105861811A (en) * | 2016-04-28 | 2016-08-17 | 上海海事大学 | Online quantitative evaluation system and method for vibration aging effect |
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2016
- 2016-04-28 CN CN201620371302.4U patent/CN205662571U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105861811A (en) * | 2016-04-28 | 2016-08-17 | 上海海事大学 | Online quantitative evaluation system and method for vibration aging effect |
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Granted publication date: 20161026 Effective date of abandoning: 20180202 |
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| AV01 | Patent right actively abandoned |