CN201438134U - Vibration aging system capable of judging peak rapidly - Google Patents
Vibration aging system capable of judging peak rapidly Download PDFInfo
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- CN201438134U CN201438134U CN2009201333069U CN200920133306U CN201438134U CN 201438134 U CN201438134 U CN 201438134U CN 2009201333069 U CN2009201333069 U CN 2009201333069U CN 200920133306 U CN200920133306 U CN 200920133306U CN 201438134 U CN201438134 U CN 201438134U
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- vibrator
- frequency
- aging system
- oscillating aging
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Abstract
The utility model relates to a vibration aging system capable of judging peak rapidly. The vibration aging system comprises a vibration exciter unit, an amplitude detection unit, a lower computer and an upper computer, wherein a vibration exciter in the vibration exciter unit and an amplitude sensor in the amplitude detection unit are arranged on a detected workpiece; a vibration exciter controller in the vibration exciter unit is connected with the lower computer; the lower computer is connected with the upper computer; and the amplitude sensor is connected with the upper computer. The vibration aging system has simple structure, can detect the resonance vibration frequency and the resonance oscillation frequency of the workpiece, has higher frequency resolution compared with the Fourier transform and has higher frequency resolution for the data acquired in the short time, so as to meet the requirement on the detection accuracy degree of the resonance vibration frequency and the resonance oscillation frequency of the small-sized workpiece; in addition, the aging treatment time can be shortened, the noise is lowered, the electric energy is saved, and the loss of the vibration aging system can be reduced.
Description
[technical field]
The utility model relates to the vibration aging technology field, is specifically related to a kind of mechanical workpieces be carried out declaring in the peak process of oscillating aging, by the data analysis that collects being obtained vibration peak carries out oscillating aging then to workpiece according to analysis result system.
[background technology]
Oscillating aging is a kind of technology that is used to eliminate the mechanical workpieces internal residual stress in the mechanical processing industry, is to drive Workpiece vibration by the vibrator that the control system control of oscillating aging equipment is fixed on the workpiece.
Declaring the peak method is the method that oscillating aging system is sought workpiece natural frequency (resonant frequency) and resonance frequency.The peak method of declaring of conventional vibration aging system is to make vibrator slowly be raised to maximum speed (this process is called frequency sweep) from minimum speed, data acquisition circuit is by the amplitude under the forced vibration of amplitude sensor collection workpiece, judge the resonance peak and the harmonic peak (extreme point on the amplitude-speed curves of the natural frequency of workpiece and resonance frequency correspondence is called resonance peak and harmonic peak) of workpiece by the extreme point of analyzing amplitude-speed curves, this is traditional peak method of declaring, and carries out in time domain.The timeliness equipment that uses this time domain to declare the peak method generally has following shortcoming:
One, during conventional vibration timeliness equipment frequency sweep generally the minimum speed from vibrator slowly be raised to maximum speed, carrying out frequency sweep expends time in and long (generally needs 3-6 minute, if carry out the secondary frequency sweep again when judging the effect of timeliness, time doubles), when carrying out the oscillating aging of workpiece in enormous quantities, have a strong impact on work efficiency like this, and the oscillating aging equipment task time is longer, can cause waste of power resources, problems such as the shortening in serviceable life of oscillating aging equipment itself; In addition, operating personnel also will stand long noise.
Two, for large-scale workpiece, the oscillating aging equipment of the peak method of declaring that employing is conventional can analyze the resonant frequency and the resonance frequency of workpiece usually.And for miniature workpiece, situation is quite different.On the one hand, because the rigidity of miniature workpiece is generally all bigger, in the time of frequency sweep, the forced vibration amplitude difference of workpiece is little under different vibrator rotating speeds, causes being difficult to find the resonance peak or the harmonic peak that can carry out timeliness with the conventional peak method of declaring; On the other hand, the vibrator that is connected on the miniature workpiece causes whole workpiece along with vibrator vibrates when frequency sweep easily, the amplitude sensor collection amplitude of returning is just inaccurate like this, might judge resonant frequency by accident, causes oscillating aging not get a desired effect.
Three, for some very high workpiece of natural frequency, in the rated speed scope of vibrator, (be generally less than 12000 revolutions per seconds), with conventional frequency sweep mode, can not obtain carrying out the resonance peak or the harmonic peak of timeliness.
At the problems referred to above, we attempt adopting Fourier transform to carry out frequency domain declaring the peak.Traditional signal analysis is to be based upon on the basis of Fourier transform.Though Fourier transform can connect the temporal signatures and the frequency domain character of signal, can not organically combine the two respectively from the time domain and the frequency domain observation signal of signal.Because what Fourier analysis used is a kind of conversion of the overall situation, or fully in time domain, or, therefore can't explain the time-frequency local character of signal fully at frequency domain, and this character character of the most basic and most critical of non-stationary signal exactly.The amplitude signal of native system is exactly a kind of transient signal of non-stationary, is not enough from time domain or frequency domain analysis only.
[utility model content]
The purpose of this utility model provides a kind of oscillating aging system that uses wavelet analysis method in declaring the peak process, it can solve the frequency sweep time that exists in the existing vibration aging technology long, that miniature workpiece is declared the peak is inaccurate, sometimes even can't find peak value, Fourier transform that problems such as temporal signatures and frequency domain character can not be provided simultaneously.
The technical scheme that the prior art problem that solves the utility model is adopted is for providing a kind of oscillating aging system of rapidly judging peak, described oscillating aging system comprises: vibrator unit, amplitude detection units, slave computer and host computer, wherein, vibrator in the described vibrator unit and the amplitude sensor in the described amplitude detection units are installed on the measured workpiece, vibrator controller in the described vibrator unit is connected with described slave computer, described slave computer is connected with described host computer, and the amplitude sensor in the described amplitude detection units is connected with described host computer.
According to an optimal technical scheme of the present utility model: described host computer is a data processing terminal.
According to an optimal technical scheme of the present utility model: described slave computer can pass through serial ports, USB interface or wireless communication mode and be connected with described host computer.
According to an optimal technical scheme of the present utility model: described slave computer comprises MCU and electric current/rotating speed collecting unit.
According to an optimal technical scheme of the present utility model: the vibrator unit comprises vibrator and vibrator controller, and described vibrator is connected with described slave computer by described vibrator controller.
According to an optimal technical scheme of the present utility model: described oscillating aging system also comprises input block and output unit, and described input block is connected with described host computer, and described host computer is connected with described output unit.
According to an optimal technical scheme of the present utility model: described input block is operating key or keyboard.
According to an optimal technical scheme of the present utility model: described output unit comprises printer and display.
Oscillating aging system of the present utility model is simple in structure, adopts the beneficial effect that can produce after the technical solution of the utility model to comprise:
One, reduced the frequency sweep time, saved energy resource consumption, reduced the loss of oscillating aging equipment itself, make workpiece produce forced vibration by quick raising speed of vibrator or the employing mode of knocking, saved the frequency sweep time, in very short time, reached the collection amplitude data, judged the purpose of workpiece resonant frequency and resonance frequency, reached save time, the purpose of power saving, minimizing equipment loss, the noise when reducing timeliness.
Two, solved the problem that the oscillating aging equipment that adopts tradition to declare the peak method can't be found out the harmonic peak of the very big workpiece of part small workpiece and rigidity, and declare the oscillating aging equipment of peak method based on wavelet analysis in use the utility model, can calculate resonant frequency and each rank resonance frequency of workpiece, the software in the controller can select several harmonic peaks to carry out timeliness in the rated speed scope of vibrator.
Three, improve the accuracy of miniature workpiece being declared the peak, wavelet analysis is declared the peak method by the amplitude on each frequency of signal is analyzed, can clearly tell the resonant frequency of workpiece, reduce time domain and declared the problem of peak method the erroneous judgement of miniature workpiece resonant frequency.
Four, for the workpiece of resonant frequency above the vibrator vibration frequency range, can find the harmonic peak of workpiece correspondence in vibrator rated speed scope, solved the oscillating aging problem of resonant frequency above vibrator vibration frequency range workpiece.
[description of drawings]
Fig. 1. the structural representation of the oscillating aging system of a kind of rapidly judging peak that proposes in the utility model;
Fig. 2. utilize the process flow diagram of declaring the peak method in this practicality.
[embodiment]
Below in conjunction with accompanying drawing technical solutions of the utility model are elaborated:
See also the structural representation that Fig. 1 the utility model proposes a kind of oscillating aging system of rapidly judging peak.As shown in FIG., the utility model also provides a kind of oscillating aging system of rapidly judging peak: described oscillating aging system comprises: vibrator unit 101, amplitude detection units 102, slave computer 104 and host computer 103, wherein, vibrator 105 in the described vibrator unit 101 and the amplitude sensor in the described amplitude detection units 102 are installed on the measured workpiece, vibrator controller 106 in the described vibrator unit 101 is connected with described slave computer 104, described slave computer 104 is connected with described host computer 103, and described amplitude sensor is connected with described host computer 103.
In optimal technical scheme of the present utility model: described host computer 103 is for to be used for storing separately the data processing terminal that oscillating aging is declared the peak module, and it is connected by serial ports, USB interface or wireless communication mode with described slave computer 104.The amplitude that described host computer 103 is gathered under the workpiece forced vibration by amplitude detection units 102, then the sampled result of amplitude signal is analyzed, to sample information quantize, introduce window function, carry out wavelet transformation, obtain time-the yardstick corresponding relation, at last yardstick is converted to frequency to obtain the peak value of oscillating aging.Described oscillating aging system also comprises input block and output unit, and described input block is connected with described host computer 103, and described host computer 103 is connected with described output unit.Described input block is operating key or keyboard 109, and described output unit comprises printer 110 and display 111.Described host computer 103 also has data storage function, can be with the information that collects and the information stores that obtains after handling get up in order to checking.
In an optimal technical scheme of the present utility model: described vibrator unit 101 comprises vibrator 105 and vibrator controller 106, described vibrator 105 is connected with described slave computer 104 by described vibrator controller 106, described amplitude sensor is connected with described host computer 103, described slave computer 104 comprises MCU108 and electric current/rotating speed collecting unit 107, described oscillating aging system also comprises input block and output unit, described input block is connected with described host computer 103, described host computer 103 is connected with described output unit, described input block is operating key or keyboard 109, and described output unit comprises printer 110 and display 111.
See also Fig. 2 the utility model be used for oscillating aging declare that the peak method and system are used for oscillating aging declare the peak method flow diagram.As shown in Figure 2, provide a kind of peak method of declaring that is used for oscillating aging, the described peak method of declaring that is used for oscillating aging comprises step:
The first step, amplitude signal is sampled;
Second goes on foot, sample information is quantized;
The 3rd step, introducing window function
Wherein, a ∈ R and a ≠ 0, a is a scale factor, and expression is flexible with frequency dependence, and b is the time displacement factor;
The 4th the step, carry out wavelet transformation by following formula:
Wherein: b is a translation parameters, and a is flexible parameter, ψ
*Conjugate function for ψ;
The 5th the step, by wavelet transformation obtain time-the yardstick corresponding relation;
The 6th goes on foot, yardstick is passed through
Be converted to frequency, obtain the peak value of oscillating aging;
Wherein: a represents yardstick, and Δ is represented the sampling period, F
cBe the centre frequency of small echo, F
aRepresent the frequency corresponding with yardstick a.
In an optimal technical scheme of the present utility model:
The described first step is specially: according to the highest frequency of sampling thheorem sample frequency greater than the signal of twice, and will be higher than part filtering in filtering of the maximum frequency of oscillation that vibrator 105 can produce in the signal.
The quantizing process in described second step is the process that the amplitude signal through over-sampling is approximately discrete value.
Described the 4th step is specially: wavelet transformation has higher frequency resolution and lower temporal resolution in low frequency part, have higher temporal resolution and lower frequency resolution at HFS, the area of the time-frequency window of correspondence immobilizes during wavelet transformation, the time window change with frequently window is relative, specific practice is to use short window and wideband window when high frequency, then uses window and short window frequently when wide when low frequency.
Described the 5th step is specially: amplitude signal through can obtain after the wavelet transformation time-the yardstick curve, scale factor is represented flexible with frequency dependence, x axle correspondence be the time, the y axle is a yardstick, yardstick is more little, corresponding frequency is high more; X-y point expression wavelet conversion coefficient, the coefficient of wavelet transformation is represented small echo and is in the waveform degree of approximation of analyzing signal in the period, the size of coefficient is distinguished by drawn shade of publishing picture, by signal is carried out continuous wavelet transform, can carry out time frequency analysis to signal, promptly observation signal is at the composition of going up sometime corresponding a certain yardstick a.
Described the 6th step is specially: the scale-value that can find out maximum wavelet coefficient correspondence by observation signal at the composition of going up sometime corresponding a certain yardstick a, calculate the natural frequency of workpiece according to yardstick, it is time a little bigger that harmonic peak quantity as required such as finds out at the quantity wavelet coefficient then, yardstick according to inferior a little bigger correspondence calculates time a little bigger corresponding frequency, promptly obtains the harmonic peak frequency of the workpiece of needs.
The purpose of this utility model is to provide a kind of oscillating aging system based on wavelet analysis technology at defective of the prior art, it can solve the frequency sweep time that exists in the existing vibration aging technology long, that miniature workpiece is declared the peak is inaccurate, sometimes even can't find peak, Fourier transform that problems such as temporal signatures and frequency domain character can not be provided simultaneously.
Wavelet analysis uses a window function (wavelet function), and the time frequency window area is constant, but shape can change.Wavelet function is adjusted Time And Frequency resolution as required, has the characteristics of multiresolution analysis (MultiresolutionAnalysis), has overcome the difficulty of the single resolution of Short Time Fourier Transform analysis non-stationary signal.Wavelet analysis is a kind of time---the dimensional analysis method, and all has the ability of characterization signal local feature in time, yardstick (frequency) two territories, have higher frequency resolution and lower temporal resolution in low frequency part, have higher temporal resolution and lower frequency resolution at HFS, be well suited for and survey the moment abnormal phenomena of carrying secretly in the normal signal and show its composition.So wavelet analysis is called as the microscope of analytic signal.
The purpose of this utility model is achieved through the following technical solutions: behind the pending workpiece location, vibrator 105 and amplitude sensor are placed on the workpiece respectively, be connected with oscillating aging equipment simultaneously, the signal of the 103 pairs of collections of host computer in the oscillating aging equipment is analyzed, and uses the natural frequency and the resonance frequency that find workpiece based on the peak method of declaring of wavelet analysis.Thereby slave computer 104 sends control corresponding according to related process and instructs and carry out timeliness to 105 pairs of workpiece of vibrator controller 106 control vibrators.Relative curve information in the ag(e)ing process can show by display 111, print with printer 110.
Be further to realize the utility model, can be by the following technical solutions:
Scheme one, vibrator 105 and amplitude sensor are fixed on the workpiece, on workpiece, knock with hammer, the amplitude that host computer 103 is gathered under the workpiece forced vibration by amplitude detection units 102, utilizing wavelet analysis to declare the peak method then analyzes the amplitude data that collects, obtain resonant frequency and each rank resonance frequency of workpiece, slave computer 104 control vibrators 105 carry out Ageing Treatment according to technological requirement near the selected pairing rotating speed of frequency then.
Scheme two, vibrator 105 and amplitude sensor are fixed on the workpiece, control vibrator 105 is from the quick raising speed of low regime, host computer 103 is by the amplitude under the forced vibration of amplitude sensor collection workpiece, utilizing wavelet analysis to declare the peak method then analyzes the data that collect, obtain resonant frequency and each rank resonance frequency of workpiece, slave computer 104 control vibrators 105 carry out Ageing Treatment according to technological requirement near the selected pairing rotating speed of frequency then.
The peak method of declaring scheme one and the wavelet analysis in the scheme two adopt as Fig. 1 the utility model be used for oscillating aging declare that the peak method and system are used for oscillating aging declare that method realizes as described in the peak method flow diagram: amplitude signal is carried out a series of processing, comprises sampling, quantification, introducing window function, wavelet analysis etc.Based on the declaring the peak method and can improve frequency resolution of wavelet analysis, short data is still had higher frequency resolution, thereby improve the accuracy of frequency spectrum detection.
After adopting technique scheme, reduced the frequency sweep time, saved energy resource consumption, reduced the loss of oscillating aging equipment itself, make workpiece produce forced vibration by vibrator 105 quick raising speeds or the employing mode of knocking, saved the frequency sweep time, in very short time, reached the collection amplitude data, judge the purpose of workpiece resonant frequency and resonance frequency, reached and saved time, power saving, reduce equipment loss, the purpose of the noise when reducing timeliness, and solved the problem that the oscillating aging equipment that adopts tradition to declare the peak method can't be found out the harmonic peak of the very big workpiece of part small workpiece and rigidity, and declare the oscillating aging equipment of peak method based on wavelet analysis in use the utility model, can calculate resonant frequency and each rank resonance frequency of any workpiece.Software in the host computer 103 can select several harmonic peaks to carry out timeliness in the rated speed scope of vibrator 105, the accuracy at peak is declared in raising to miniature workpiece, wavelet analysis is declared the peak method by the amplitude on each frequency of signal is analyzed, can clearly tell the resonant frequency of workpiece, reduced time domain and declared the problem of peak method the erroneous judgement of miniature workpiece resonant frequency, the workpiece that surpasses vibrator 105 vibration frequency range for resonant frequency, can find the harmonic peak of workpiece correspondence in vibrator 105 rated speed scopes, solve the oscillating aging problem of resonant frequency above vibrator 105 vibration frequency range workpiece.
Above content be in conjunction with concrete optimal technical scheme to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (8)
1. the oscillating aging system of a rapidly judging peak, it is characterized in that: described oscillating aging system comprises: vibrator unit (101), amplitude detection units (102), slave computer (104) and host computer (103), wherein, vibrator (105) in the described vibrator unit (101) and the amplitude sensor in the described amplitude detection units (102) are installed on the measured workpiece, vibrator controller (106) in the described vibrator unit (101) is connected with described slave computer (104), described slave computer (104) is connected with described host computer (103), and the amplitude sensor in the described amplitude detection units (102) is connected with described host computer (103).
2. according to the oscillating aging system of the described a kind of rapidly judging peak of claim 1, it is characterized in that: described host computer (103) is a data processing terminal.
3. according to the oscillating aging system of the described a kind of rapidly judging peak of claim 1, it is characterized in that: described slave computer (104) can pass through serial ports, USB interface or wireless communication mode and be connected with described host computer (103).
4. according to the oscillating aging system of the described a kind of rapidly judging peak of claim 1, it is characterized in that: described slave computer (104) comprises MCU (108) and electric current/rotating speed collecting unit (107).
5. according to the oscillating aging system of the described a kind of rapidly judging peak of claim 1, it is characterized in that: vibrator unit (101) comprise vibrator (105) and vibrator controller (106), and described vibrator (105) is connected with described slave computer (104) by described vibrator controller (106).
6. according to the oscillating aging system of the described a kind of rapidly judging peak of claim 1, it is characterized in that: described oscillating aging system also comprises input block and output unit, described input block is connected with described host computer (103), and described host computer (103) is connected with described output unit.
7. according to the oscillating aging system of the described a kind of rapidly judging peak of claim 6, it is characterized in that: described input block is operating key or keyboard (109).
8. according to the oscillating aging system of the described a kind of rapidly judging peak of claim 6, it is characterized in that: described output unit comprises printer (110) and display (111).
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| CN2009201333069U CN201438134U (en) | 2009-06-26 | 2009-06-26 | Vibration aging system capable of judging peak rapidly |
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| CN201438134U true CN201438134U (en) | 2010-04-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527015A (en) * | 2016-01-07 | 2016-04-27 | 浙江大学 | Flexible structure resonant frequency visualized detection system and method |
| CN111693282A (en) * | 2019-03-15 | 2020-09-22 | 计算系统有限公司 | Waveform acquisition optimization |
-
2009
- 2009-06-26 CN CN2009201333069U patent/CN201438134U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527015A (en) * | 2016-01-07 | 2016-04-27 | 浙江大学 | Flexible structure resonant frequency visualized detection system and method |
| CN111693282A (en) * | 2019-03-15 | 2020-09-22 | 计算系统有限公司 | Waveform acquisition optimization |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100414 |