CN102749425B - Method and device for fatigue test crack diagnosis of engine body - Google Patents
Method and device for fatigue test crack diagnosis of engine body Download PDFInfo
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- CN102749425B CN102749425B CN201210268739.1A CN201210268739A CN102749425B CN 102749425 B CN102749425 B CN 102749425B CN 201210268739 A CN201210268739 A CN 201210268739A CN 102749425 B CN102749425 B CN 102749425B
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Abstract
An embodiment of the invention discloses a method and a device for fatigue test crack diagnosis of an engine body. A strain foil and an acceleration transducer respectively collect strain signals and vibration signals of the engine body in a fatigue test. A data collection card converts the strain signals and the vibration signals respectively into digital signals and transmits the strain signals and the vibration signals which are converted into the digital signals to an industrial personal machine. The industrial personal machine collects a plurality of discrete signals from the strain signals and the vibration signals which are converted into the digital signals, conducts wavelet analysis on the plurality of collected strain signals, conducts signal singularity monitoring on analysis results, conducts Fourier transform on the plurality of collected discrete vibration signals and conducts characteristic value analysis on conversion results. The industrial personal machine judges whether results of singularity monitoring and characteristic value analysis are abnormal or not and judges that an engine has fatigue cracks on yes judgment. The method and the device can reduce unnecessary manpower and financial resources.
Description
Technical field
The present invention relates to test diagnosis field, particularly relate to a kind of fatigue test for body of engine Method for Cracks and device.
Background technology
Concerning engine, fatigue refers to that material is under the effect of pulsating stress or cyclic strain, because certain point or some point create the permanent structure change of local, thus after certain cycle index, forms crackle or the process of fracture occurs.
In existing fatigue test for body of engine, to the diagnosis of organism fatigue crackle, be all generally by manually with the naked eye observing.When finding fatigue crack, crackle has expanded to very large sometimes, causes test figure very out of true; And if find crackle not in time, likely cause the generation of test incident.
In existing organism fatigue test, not yet there is special organism fatigue Method for Cracks, organism fatigue crackle is diagnosed, realize automatically stopping shutdown.Whether in actual tests, need special messenger and carry out guard on duty, all need observation to have crackle to produce every one hour, during its organism fatigue is tested, human cost increases; And whether produce owing to manually observing organism fatigue crackle at regular intervals, cause the organism fatigue lifetime results of physical record and out of true, thus result through and have error in the fatigue limit value and reality that the organism fatigue life-span obtains, finally affect the judgement of enterprise to body reliability.
Therefore be necessary to study the diagnostic method of fatigue test for body of engine crackle, thus reduce unnecessary manpower and financial resources.
Summary of the invention
In order to solve the problems of the technologies described above, embodiments provide a kind of diagnostic method and device of fatigue test for body of engine crackle, to reduce unnecessary manpower and financial resources.
The embodiment of the invention discloses following technical scheme:
A kind of fatigue test for body of engine Method for Cracks, comprises step:
A. foil gauge and acceleration transducer gather strain signal and the vibration signal of engine body in torture test respectively;
B. data collecting card converts described strain signal and vibration signal to digital signal respectively, and converts the strain signal of digital signal and vibration signal described in sending to industrial computer;
C. industrial computer gathers multiple discrete signal from converting to the strain signal of digital signal and vibration signal respectively, wavelet analysis is carried out to the multiple discrete strain signal gathered, Signal Singularity monitoring is carried out to analysis result, Fourier transform is carried out to the multiple Discrete signal gathered, Eigenvalues analysis is carried out to transformation result;
D. industrial computer judges whether the result of singularity monitoring and Eigenvalues analysis all occurs exception, if so, judges that fatigue crack appears in engine, otherwise, return steps A.
Preferably, after stepb before step C, also comprise:
Industrial computer carries out Pasteur's low-pass filtering treatment to the strain signal converting digital signal described in step B to, carries out Wavelet Denoising Method process, reject untrue composition to the vibration signal converting digital signal described in step B to.
Preferably, described industrial computer judges whether the result of singularity monitoring and Eigenvalues analysis occurs abnormal comprising:
Preset the regime values scope of singularity and eigenwert, the regime values scope preset described in singularity monitoring and the result of Eigenvalues analysis exceed then judges that it occurs exception.
Preferably, industrial computer described in described step C gathers multiple discrete signal the strain signal of digital signal and vibration signal from converting to is respectively:
Industrial computer respectively the strain signal of digital signal and vibration signal gathers 1024 discrete signals from converting to respectively.
Preferably, described foil gauge and acceleration transducer gather the strain signal of engine body in torture test and vibration signal is respectively:
6 foil gauges and 2 acceleration transducers gather 6 road strain signals and the 2 road vibration signals of engine in torture test respectively;
Then described step D is:
Whether the singularity monitoring that industrial computer judges to obtain according to any road strain signal and the result of Eigenvalues analysis obtained according to any road vibration signal all there is exception, if so, judge that fatigue crack appears in engine, otherwise, return steps A.
A kind of fatigue test for body of engine Cracks Diagnosis device, comprising: foil gauge, acceleration transducer, data collecting card and industrial computer:
Described foil gauge, for gathering the strain signal of engine in torture test;
Described acceleration transducer, for gathering the vibration signal of engine in torture test;
Described data collecting card is connected with acceleration transducer with described foil gauge, for converting described strain signal and vibration signal to digital signal respectively, and converts the strain signal of digital signal and vibration signal described in sending to industrial computer;
Described industrial computer is connected with data collecting card, for gathering multiple discrete signal from converting to the strain signal of digital signal and vibration signal respectively, wavelet analysis is carried out to the multiple discrete strain signal gathered, Signal Singularity monitoring is carried out to analysis result, Fourier transform is carried out to the multiple Discrete signal gathered, Eigenvalues analysis is carried out to transformation result, judge whether the result of singularity monitoring and Eigenvalues analysis all occurs exception, if, judge that fatigue crack appears in engine, otherwise, trigger foil gauge and acceleration transducer Resurvey signal.
Preferably, industrial computer also for carrying out Pasteur's low-pass filtering treatment to the described strain signal converting digital signal to, carrying out Wavelet Denoising Method process to the described vibration signal converting digital signal to, rejecting untrue composition.
Preferably, the number of described foil gauge is 6, and the number of described acceleration transducer is 2.
Preferably, in described 6 foil gauges, wherein two panels is arranged on camshaft hole oilhole place, and all the other four are arranged on main beating cap place.
Preferably, described 2 acceleration transducers are arranged on main beating cap place.
As can be seen from the above-described embodiment, by gathering and processing strain signal and the vibration signal of engine body key position, judge whether engine fatigue crack produces, greatly improve precision and the accuracy of judgement, add the security of test and decrease unnecessary manpower and financial resources.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a process flow diagram of a kind of fatigue test for body of engine Method for Cracks of the present invention;
Fig. 2 is another process flow diagram of a kind of fatigue test for body of engine Method for Cracks of the present invention;
Fig. 3 is a system construction drawing of a kind of fatigue test for body of engine Cracks Diagnosis of the present invention device.
Embodiment
Embodiments provide a kind of fatigue test for body of engine Method for Cracks and device.，
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the embodiment of the present invention below in conjunction with accompanying drawing.
Embodiment one
Refer to Fig. 1, it is a process flow diagram of a kind of fatigue test for body of engine Method for Cracks of the present invention, and the method comprises the following steps:
S101: start fatigue test for body of engine.
S102: foil gauge and acceleration transducer gather strain signal and the vibration signal of engine body in torture test respectively.
S103: data collecting card converts described strain signal and vibration signal to digital signal respectively, and convert the strain signal of digital signal and vibration signal described in sending to industrial computer.
S104: industrial computer gathers multiple discrete signal from converting to the strain signal of digital signal and vibration signal respectively, wavelet analysis is carried out to the multiple discrete strain signal gathered, Signal Singularity monitoring is carried out to analysis result, Fourier transform is carried out to the multiple Discrete signal gathered, Eigenvalues analysis is carried out to transformation result.
Need to further illustrate to step S104, industrial computer can receive the strain signal converting digital signal described in multichannel to, and the number of multichannel is consistent with the number of the foil gauge gathering strain signal; Industrial computer can also receive the vibration signal converting digital signal described in multichannel to, and the number of multichannel is consistent with the number of the acceleration transducer gathering vibration signal.Certainly, industrial computer also can only receive the strain signal converting digital signal described in a road to, and converts the vibration signal of digital signal to described in a road.Now, the number of foil gauge is a slice, and the number of acceleration transducer is also one.
Manually can set the frequency acquisition of industrial computer to the strain signal and vibration signal that convert digital signal to, being one group with multiple discrete signals of some carries out further wavelet analysis or Fourier transform at every turn, the number of described multiple discrete signal is preferably 1024, the requirement of reaching test that can be optimum.
S105: industrial computer judges whether the result of singularity monitoring and Eigenvalues analysis all occurs exception, if so, judges that fatigue crack appears in engine, otherwise, return step S101.
Need to further illustrate to step S105, preset the regime values scope of singularity and eigenwert, the regime values scope preset described in singularity monitoring and the result of Eigenvalues analysis exceed then judges that it occurs exception.
For the singularity monitoring of the strain signal of multichannel and the Eigenvalues analysis of vibration signal of multichannel, whether the singularity monitoring that industrial computer judges to obtain according to any road strain signal and the result of Eigenvalues analysis obtained according to any road vibration signal all there is exception, if, judge that fatigue crack appears in engine, otherwise, return step S101.
S106: alert trigger, realizes auto stop.
It should be noted that, this step S106 is optional step, that is, execute S105 and just realize fatigue test for body of engine Cracks Diagnosis process.As can be seen from the above-described embodiment, by gathering and processing strain signal and the vibration signal of engine body key position, judge whether engine fatigue crack produces, greatly improve precision and the accuracy of judgement, add the security of test and decrease unnecessary manpower and financial resources.
Embodiment two
Refer to Fig. 2, it is another process flow diagram of a kind of fatigue test for body of engine Method for Cracks of the present invention, and the method is further comprising the steps of:
S201: start fatigue test for body of engine.
S202: foil gauge and acceleration transducer gather strain signal and the vibration signal of engine body in torture test respectively.
S203: data collecting card converts described strain signal and vibration signal to digital signal respectively, and convert the strain signal of digital signal and vibration signal described in sending to industrial computer.
S204: industrial computer carries out Pasteur's low-pass filtering treatment to the described strain signal converting digital signal to, carries out Wavelet Denoising Method process to the described vibration signal converting digital signal to, rejects untrue composition.
Need to further illustrate to step S204, carry out Wavelet Denoising Method process to the described vibration signal converting digital signal to and preferably adopt sym6 small echo to analyze signal, db1 small echo carries out 4 layers of decomposition to signal; Untrue composition mainly noise and the clutter of rejecting.
S205: industrial computer gathers multiple discrete signal from converting to the strain signal of digital signal and vibration signal respectively, wavelet analysis is carried out to the multiple discrete strain signal gathered, Signal Singularity monitoring is carried out to analysis result, Fourier transform is carried out to the multiple Discrete signal gathered, Eigenvalues analysis is carried out to transformation result.
S206: industrial computer judges whether the result of singularity monitoring and Eigenvalues analysis all occurs exception, if so, judges that fatigue crack appears in engine, otherwise, return step S201.
S207: alert trigger, realizes auto stop.
It should be noted that, this step S207 is optional step, that is, execute S105 and just realize fatigue test for body of engine Cracks Diagnosis process.
Wherein, step S201-203 please refer to the step S101-103 of embodiment one, and step S205-207 please refer to the step S104-106 of embodiment one.
As can be seen from the above-described embodiment, by gathering and processing strain signal and the vibration signal of engine body key position, judge whether engine fatigue crack produces, greatly improve precision and the accuracy of judgement, add the security of test and decrease unnecessary manpower and financial resources.
Embodiment three
Refer to Fig. 3, its system construction drawing being a kind of fatigue test for body of engine Cracks Diagnosis of the present invention device, comprise data collecting card 301, industrial computer 302, foil gauge 303 (1) to foil gauge 303 (N) and acceleration transducer 304 (1) to acceleration transducer 304 (M), wherein N and M is the integer being more than or equal to 1
Described foil gauge 303 (1)-303 (N), for gathering the strain signal of engine in torture test;
Described acceleration transducer 304 (1)-304 (M), for gathering the vibration signal of engine in torture test;
Described data collecting card 301 is connected with acceleration transducer 304 (1)-304 (M) with described foil gauge 303 (1)-303 (N), for converting described strain signal and vibration signal to digital signal respectively, and convert the strain signal of digital signal and vibration signal described in sending to industrial computer.
Described industrial computer 302 is connected with data collecting card 301, for gathering multiple discrete signal from converting to the strain signal of digital signal and vibration signal respectively, wavelet analysis is carried out to the multiple discrete strain signal gathered, Signal Singularity monitoring is carried out to analysis result, Fourier transform is carried out to the multiple Discrete signal gathered, Eigenvalues analysis is carried out to transformation result; Judge whether the result of singularity monitoring and Eigenvalues analysis all occurs exception, if so, judge that fatigue crack appears in engine, otherwise, trigger foil gauge and acceleration transducer Resurvey signal.
Preferably, described industrial computer also for carrying out Pasteur's low-pass filtering treatment to the described strain signal converting digital signal to, carrying out Wavelet Denoising Method process to the described vibration signal converting digital signal to, rejecting untrue composition.
Preferably, arrange 6 foil gauges, N=6 in the present embodiment, wherein two panels is arranged on camshaft hole oilhole place, and all the other four are arranged on main beating cap place.
Preferably, be provided with two acceleration transducers in the present embodiment, M=2, be all arranged on main beating cap place.
As can be seen from the above-described embodiment, by gathering and processing strain signal and the vibration signal of engine body key position, judge whether engine fatigue crack produces, greatly improve precision and the accuracy of judgement, add the security of test and decrease unnecessary manpower and financial resources.
It should be noted that, one of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Examine method and apparatus to a kind of fatigue test for body of engine crackle provided by the present invention to be above described in detail, apply specific embodiment herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a fatigue test for body of engine Method for Cracks, is characterized by, and comprises step:
A. foil gauge and acceleration transducer gather strain signal and the vibration signal of engine body in torture test respectively;
B. data collecting card converts described strain signal and vibration signal to digital signal respectively, and converts the strain signal of digital signal and vibration signal described in sending to industrial computer;
C. industrial computer gathers multiple discrete signal from converting to the strain signal of digital signal and vibration signal respectively, wavelet analysis is carried out to the multiple discrete strain signal gathered, be specially: be one group with multiple discrete strain signal and carry out wavelet analysis, Signal Singularity monitoring is carried out to analysis result, Fourier transform is carried out to the multiple Discrete signal gathered, is specially: be one group with multiple Discrete signal and carry out Fourier transform; Eigenvalues analysis is carried out to transformation result;
D. industrial computer judges whether the result of singularity monitoring and Eigenvalues analysis all occurs exception, if so, judges that fatigue crack appears in engine, otherwise, return steps A.
2. method according to claim 1, is characterized by, and after stepb before step C, also comprises:
Industrial computer carries out Pasteur's low-pass filtering treatment to the strain signal converting digital signal described in step B to, carries out Wavelet Denoising Method process, reject untrue composition to the vibration signal converting digital signal described in step B to.
3. method according to claim 1, is characterized by, and described industrial computer judges whether the result of singularity monitoring and Eigenvalues analysis occurs abnormal comprising:
Preset the regime values scope of singularity and eigenwert, the regime values scope preset described in singularity monitoring and the result of Eigenvalues analysis exceed then judges that it occurs exception.
4. method according to claim 1, is characterized by, and industrial computer described in described step C gathers multiple discrete signal the strain signal of digital signal and vibration signal from converting to is respectively:
Industrial computer respectively the strain signal of digital signal and vibration signal gathers 1024 discrete signals from converting to respectively.
5. method according to claim 1, is characterized by, and described foil gauge and acceleration transducer gather the strain signal of engine body in torture test respectively and vibration signal is:
6 foil gauges and 2 acceleration transducers gather 6 road strain signals and the 2 road vibration signals of engine in torture test respectively;
Then described step D is:
Whether the singularity monitoring that industrial computer judges to obtain according to any road strain signal and the result of Eigenvalues analysis obtained according to any road vibration signal all there is exception, if so, judge that fatigue crack appears in engine, otherwise, return steps A.
6. a fatigue test for body of engine Cracks Diagnosis device, is characterized by, and comprising: foil gauge, acceleration transducer, data collecting card and industrial computer:
Described foil gauge, for gathering the strain signal of engine in torture test;
Described acceleration transducer, for gathering the vibration signal of engine in torture test;
Described data collecting card is connected with acceleration transducer with described foil gauge, for converting described strain signal and vibration signal to digital signal respectively, and converts the strain signal of digital signal and vibration signal described in sending to industrial computer;
Described industrial computer is connected with data collecting card, for gathering multiple discrete signal from converting to the strain signal of digital signal and vibration signal respectively, wavelet analysis is carried out to the multiple discrete strain signal gathered, be specially: be one group with multiple discrete strain signal and carry out wavelet analysis, Signal Singularity monitoring is carried out to analysis result, Fourier transform is carried out to the multiple Discrete signal gathered, is specially: be one group with multiple Discrete signal and carry out Fourier transform; Eigenvalues analysis is carried out to transformation result, judges whether the result of singularity monitoring and Eigenvalues analysis all occurs exception, if so, judge that fatigue crack appears in engine, otherwise, trigger foil gauge and acceleration transducer Resurvey signal.
7. device according to claim 6, it is characterized by, industrial computer also for carrying out Pasteur's low-pass filtering treatment to the described strain signal converting digital signal to, carrying out Wavelet Denoising Method process to the described vibration signal converting digital signal to, rejecting untrue composition.
8. device according to claim 6, is characterized by, and the number of described foil gauge is 6, and the number of described acceleration transducer is 2.
9. device according to claim 8, is characterized by, and in described 6 foil gauges, wherein two panels is arranged on camshaft hole oilhole place, and all the other four are arranged on main beating cap place.
10. device according to claim 8, is characterized by, and described 2 acceleration transducers are arranged on main beating cap place.
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