CN101788334A - Frequency band energy accumulation method of power machine during unstable-state signal processing - Google Patents
Frequency band energy accumulation method of power machine during unstable-state signal processing Download PDFInfo
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- CN101788334A CN101788334A CN201019102003A CN201019102003A CN101788334A CN 101788334 A CN101788334 A CN 101788334A CN 201019102003 A CN201019102003 A CN 201019102003A CN 201019102003 A CN201019102003 A CN 201019102003A CN 101788334 A CN101788334 A CN 101788334A
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Abstract
The invention discloses a frequency band energy accumulation method of a power machine during unstable-state signal processing, comprising the following steps of: 1, respectively acquiring unstable-state signals under different working conditions of the power machine; 2, carrying out time-frequency transformation on the data of the acquired unstable-state signals to obtain a time-frequency three-dimensional diagram; 3, accumulating time shaft signals on the time-frequency three-dimensional diagram; 4, carrying out frequency band accumulation on every few frequency points; 5, acquiring a frequency band energy accumulation curve; and 6, judging a characteristic frequency band accumulation value and a standard value. The invention can effectively process the unstable-state signals by using the frequency band energy accumulation method in the analysis of the unstable-state signals of the power machine and outstandingly enhance the stability and the repeatability of an analysis result; in addition, the frequency band energy accumulation method has better spectrum estimation resolution ratio and spectrum estimation stability and higher anti-interference performance, realizes accumulation through a signal to noise ratio and is especially suitable for the extraction and the analysis of the unstable-state signals in engineering.
Description
Technical field
The present invention relates to the frequency band energy accumulation method in a kind of signal Processing; Particularly relate to the frequency band energy accumulation method during unstable signal is handled in a kind of power machine, belong to signal Processing and fault diagnosis technology field.
Background technology
Complicated power machinery system is in the process of quickening or slowing down, and the phenomenon of the failure performance is more obvious, and this is the formed common recognition of mechanical brainstrust.This explanation, the power machinery system parts under the unstable state operating condition can produce more strong excitation, make phenomenon of the failure expose more obviously.In theory, the fault signature that is implied in the vibration signal this moment is also more obvious.
The definition power machinery system is a unstable signal at the vibration signal that disposable acceleration, deceleration and circulation are quickened, circulation collects when slowing down.Obviously, unstable signal has significant non-stationary, nonlinear feature, and the steady-state signal of gathering when remaining unchanged with rotating speed is compared, and repeatability and bad stability are for the extraction of fault signature brings certain difficulty.
Summary of the invention
Technical matters to be solved by this invention is, overcomes the prior art defective, solves during the power machine unstable signal handles, and fault characteristic frequency is difficult for the difficult problem extracted, and the frequency band energy accumulation method of a kind of unstable signal in handling is provided.
The technical solution adopted in the present invention is: the frequency band energy accumulation method during a kind of power machine unstable signal is handled may further comprise the steps:
Step 1: gather the unstable signal under the different operating modes of power machine respectively; Step 2: the unstable signal data of gathering are carried out time-frequency conversion, obtain the time-frequency three-dimensional plot; Step 3: on the time-frequency three-dimensional plot, the time shaft signal is added up; Step 4: every several Frequency points are carried out frequency band add up; Step 5: obtain the frequency band energy accumulation curve; Step 6: the judgement of feature band accumulated value and standard value.
Frequency band energy accumulation method during a kind of power machine unstable signal is handled may further comprise the steps:
Step 1: gather the unstable signal under the different operating modes of power machine respectively; Step 2: the unstable signal data of gathering are carried out cyclic-spectral Analysis, obtain circulation spectrum three-dimensional plot; Step 3: on circulation spectrum three-dimensional plot, the cycle frequency axle is added up, obtain the one dimension amplitude-versus-frequency curve; Step 4: every several Frequency points are carried out frequency band add up; Step 5: obtain the frequency band energy accumulation curve; Step 6: the judgement of feature band accumulated value and standard value.
Frequency band energy accumulation method during a kind of power machine unstable signal is handled may further comprise the steps:
Step 1: gather the unstable signal under the different operating modes of power machine respectively; Step 2: the unstable signal data of gathering are carried out the higher-order spectrum analysis, obtain the higher-order spectrum three-dimensional plot; Step 3: on the higher-order spectrum three-dimensional plot, one of them frequency axis is added up, obtain the one dimension amplitude-versus-frequency curve; Step 4: every several Frequency points are carried out frequency band add up; Step 5: obtain the frequency band energy accumulation curve; Step 6: the judgement of feature band accumulated value and standard value.
The present invention beneficial effect be: adopt frequency band energy accumulation method, in the analysis of power machine unstable signal, can effectively handle unstable signal, significantly improve the stability and repeatability of analysis result; This method has better spectrum estimated resolution and spectrum estimation stability, and anti-interference is stronger, by signal to noise ratio (S/N ratio) accumulative total, is particularly suitable for the extraction and the analysis of unstable signal in the engineering.
Description of drawings
Fig. 1 is the frequency band energy accumulation method process flow diagram during the power machine unstable signal is handled;
Fig. 2 a is frequency-time-amplitude displayed map that power machine is in unstable signal time frequency analysis under the nominal situation;
Fig. 2 b is frequency-time-amplitude displayed map that power machine is in unstable signal time frequency analysis under the minor failure;
Fig. 2 c is frequency-time-amplitude displayed map that power machine is in unstable signal time frequency analysis under the catastrophic failure;
Fig. 3 is frequency-amplitude displayed map that power machine is in unstable signal frequency band energy accumulation curve under three kinds of different operating modes.
Embodiment
Below, the present invention is described in further detail with embodiment in conjunction with the accompanying drawings.
Fig. 1 is the frequency band energy accumulation method process flow diagram during unstable signal is handled.
Embodiment: as shown in Figure 1, be that example is illustrated the frequency band energy accumulation method in the unstable signal processing of the present invention with east wind EQ2102 motor car engine:
Step 1: the acceleration vibration signal when normal, minor failure of collecting crankshaft bearing and catastrophic failure respectively at the engine sump tank place;
Step 2: every group of image data carried out short time discrete Fourier transform, obtain the time-frequency three-dimensional plot; Fig. 2 a is frequency-time-amplitude displayed map that power machine is in unstable signal time frequency analysis under the nominal situation; Fig. 2 b is frequency-time-amplitude displayed map that power machine is in unstable signal time frequency analysis under the minor failure; Fig. 2 c is frequency-time-amplitude displayed map that power machine is in unstable signal time frequency analysis under the catastrophic failure, and shown in Fig. 2 a, Fig. 2 b, Fig. 2 c, vibrational energy mainly concentrates on low-frequency range; And the time order and function that peak-peak occurs under every kind of operating mode is different, though peak-peak presents the rule that increases progressively with the fault order of severity, its frequency is not on a frequency.Hence one can see that, and the small leak of non-peak-peak may comprise certain fault characteristic information, and still, because the peakedness ratio comparatively dense of three-dimensional picture, small leak is flooded by big peak value easily.For this reason, adopt frequency band energy accumulation method, acting in the summation of small leak embodied, can not flooded by big peak value.
Step 3: on the time-frequency three-dimensional plot, the time shaft signal is added up;
Step 4: every several Frequency points are carried out frequency band add up;
Step 5: obtain the frequency band energy accumulation curve.Fig. 3 is frequency-amplitude displayed map that power machine is in unstable signal frequency band energy accumulation curve under three kinds of different operating modes, as shown in Figure 3, curve 1 is a nominal situation, curve 2 is a minor failure, and curve 3 is a catastrophic failure, by Fig. 3 can be clear, find out intuitively, the frequency band energy accumulation device is under three kinds of different operating modes at unstable signal, in the 400-1000Hz frequency range, with increasing the weight of of fault degree, the energy of unstable state vibration signal is the rule that increases progressively.
Step 6: when feature band accumulated value overgauge value, have mechanical fault, when frequency band accumulated value during smaller or equal to standard value, do not have mechanical fault, equipment is normal.
Obtain thus as drawing a conclusion: adopt frequency band energy accumulation method, can extract the characteristic spectra of unstable signal effectively; Adding up of elapsed time axle and frequency band, the effect that includes the small leak of unstable signal feature is embodied, and helps comparative analysis.
Though the frequency band energy accumulation result is in the frequency difference of peak-peak under three kinds of different operating modes at unstable signal, but employing frequency band energy accumulation method, still can identify the characteristic spectra that they are in, make the result of Measurement and analysis have good stability and repeated.
That is to say " frequency band energy accumulation method ", be exactly to signal, on the time-frequency three-dimensional plot, the time shaft signal added up through time domain-frequency domain transform, perhaps, on circulation spectrum three-dimensional plot, the cycle frequency axle is added up, obtain the one dimension amplitude-versus-frequency curve, or, on the higher-order spectrum three-dimensional plot, one of them frequency axis is added up, obtain the one dimension amplitude-versus-frequency curve; Every then several Frequency points carry out frequency band and add up, and obtain the frequency band energy accumulation curve, carry out the method for fault analysis in view of the above again.
Groundwork mechanism of the present invention is: on the time-frequency three-dimensional plot of time domain-frequency domain transform or on the circulation spectrum, higher-order spectrum three-dimensional plot, after big peak value appearred in some radio-frequency components, the part small leak was submerged, the characteristic frequency value of these small leaks is left in the basket easily; In unstable signal was handled, the repeatability of signal and stability were not easy to embody, and occur the transfer of frequency peak value on the three-dimensional plot of being everlasting.If the energy in the certain frequency scope is added up, that is, frequency band energy accumulation can solve above-mentioned two problems.
When power system after there was a mechanical failure, total vibrational energy can increase in its feature band; Energy in this frequency band and other frequency band are irrelevant.Energy extraction in the special frequency band can be come out, as the index of analysis and research.On three-dimensional time-frequency figure, behind the time shaft energy accumulation, become two-dimentional frequency-amplitude figure, the small leak on the frequency axis has also participated in comparative analysis.If little translation appears in characteristic frequency point, as long as still in this frequency band, the integral body that just can the not have influence on frequency band energy that adds up, thus make the result of analysis and research have good stability with repeated.
The present invention adopts frequency band energy accumulation method, in the analysis of unstable signal, can effectively handle unstable signal, significantly improves the stability and repeatability of analysis result.
It is worthy of note; protection scope of the present invention is not limited to above-mentioned instantiation mode, according to basic fundamental design of the present invention, as long as those of ordinary skills need not through creative work; the embodiment that can associate all belongs to protection scope of the present invention.
Claims (3)
1. the frequency band energy accumulation method during a power machine unstable signal is handled is characterized in that, may further comprise the steps:
Step 1: gather the unstable signal under the different operating modes of power machine respectively;
Step 2: the unstable signal data of gathering are carried out time-frequency conversion, obtain the time-frequency three-dimensional plot;
Step 3: on the time-frequency three-dimensional plot, the time shaft signal is added up;
Step 4: every several Frequency points are carried out frequency band add up;
Step 5: obtain the frequency band energy accumulation curve;
Step 6: the judgement of feature band accumulated value and standard value.
2. the frequency band energy accumulation method during a power machine unstable signal is handled is characterized in that, may further comprise the steps:
Step 1: gather the unstable signal under the different operating modes of power machine respectively;
Step 2: the unstable signal data of gathering are carried out cyclic-spectral Analysis, obtain circulation spectrum three-dimensional plot;
Step 3: on circulation spectrum three-dimensional plot, the cycle frequency axle is added up, obtain the one dimension amplitude-versus-frequency curve;
Step 4: every several Frequency points are carried out frequency band add up;
Step 5: obtain the frequency band energy accumulation curve
Step 6: the judgement of feature band accumulated value and standard value.
3. the frequency band energy accumulation method during a power machine unstable signal is handled is characterized in that, may further comprise the steps:
Step 1: gather the unstable signal under the different operating modes of power machine respectively;
Step 2: the unstable signal data of gathering are carried out the higher-order spectrum analysis, obtain the higher-order spectrum three-dimensional plot;
Step 3: on the higher-order spectrum three-dimensional plot, one of them frequency axis is added up, obtain the one dimension amplitude-versus-frequency curve;
Step 4: every several Frequency points are carried out frequency band add up;
Step 5: obtain the frequency band energy accumulation curve;
Step 6: the judgement of feature band accumulated value and standard value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458170A (en) * | 2014-11-07 | 2015-03-25 | 桂林电子科技大学 | Time-frequency diagram processing method and system for mechanical equipment monitoring vibration signals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458170A (en) * | 2014-11-07 | 2015-03-25 | 桂林电子科技大学 | Time-frequency diagram processing method and system for mechanical equipment monitoring vibration signals |
| CN104458170B (en) * | 2014-11-07 | 2017-01-11 | 桂林电子科技大学 | Time-frequency diagram processing method and system for mechanical equipment monitoring vibration signals |
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