CN106485070A - A kind of adaptive thresholding value adjustment method - Google Patents
A kind of adaptive thresholding value adjustment method Download PDFInfo
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- CN106485070A CN106485070A CN201610880792.5A CN201610880792A CN106485070A CN 106485070 A CN106485070 A CN 106485070A CN 201610880792 A CN201610880792 A CN 201610880792A CN 106485070 A CN106485070 A CN 106485070A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
- G16Z99/00—Subject matter not provided for in other main groups of this subclass
Abstract
The present invention discloses a kind of adaptive thresholding value adjustment method, made an uproar by the intrinsic vibrational energy and bottom of computing device, it is dynamically determined threshold value, change so as to self adaptation equipment, judge whether vibrational energy region average is more than the dynamic threshold of twice and compares, the former is more than the moment of the latter first, the former is less than or equal to the moment of the latter first, the difference in two moment is used as the abnormal vibrations duration, by detecting whether the abnormal vibrations duration is less than setting value T, the vibration wrong report that removal equipment state change causes.The method of the present invention carries out adaptive vibration detection by way of study, effectively improves the accuracy of vibration detection, erroneous judgement that effective eliminating system state change causes.
Description
Technical field
The present invention relates to vibration detection field, and in particular to a kind of adaptive thresholding value adjustment method.
Background technology
A lot of equipment require possess vibration detection function at present, act on equipment for determining whether there is external force.Existing
Some vibration detection are used and are detected based on the mode of fixed threshold, i.e., when the amplitude that vibrates or energy exceed the threshold value for setting
When, detect the vibration.However, when the intrinsic vibration amplitude of equipment occurs because of some reasons, such as ground loosens, motor ages,
Patterns of change, and when changing, the mode of traditional fixed threshold can not well adapt to this change：Threshold value is too low,
Equipment is caused frequently to report vibration by mistake；Threshold value is too high, causes, to vibration not enough sensitivity, to fail to report vibration.
Content of the invention
Present invention aims to above-mentioned problems of the prior art, propose a kind of adaptive threshold adjustment side
Method, is made an uproar by the intrinsic vibrational energy and bottom of computing device, is dynamically determined threshold value such that it is able to the change of self adaptation equipment
Change, and by detecting the abnormal vibrations duration, the vibration wrong report that removal equipment state change causes.
For reaching the purpose of foregoing invention, the present invention is achieved through the following technical solutions：
A kind of adaptive thresholding value adjustment method, comprises the steps：
Step S10, according to the current acceleration value of acceleration transducer, obtains current vibration energy；
Step S20, vibrational energy data flow enter low pass filter and obtain current vibrational energy average；Vibrational energy number
According to stream also into shift register collection, average is taken to interval the deposited vibrational energy data of the storage of shift register collection, then is deducted
Vibrational energy average after adjustment, obtains vibrational energy region average；
Step S30, vibrational energy region average pass through moving average method, calculate the dynamic threshold of vibrational energy；
Step S40, sets marker bit flag and represents vibration persistent state, and initial marker bit flag is 0；Judge vibrational energy
Whether amount region average is more than the dynamic threshold of twice, and whether marker bit flag is 0, is, marker bit flag is set to 1, and remembers
Record current time t1 is used as the vibration time started, and turns again to step S10 renewal vibrational energy region average and dynamic threshold；
Otherwise when vibrational energy region average is less than or equal to the dynamic threshold of twice, then marker bit is set to 0, and records current time t2
As the vibration end time；
Whether step S50, judge to vibrate and start with the time interval for terminating less than preset value, be judge current vibration as
Real external vibration；Current vibration is otherwise judged as sporadic vibration, and return to step S10.
Further, the expression formula of the vibrational energy is：P [n]=a [n]2
Wherein n is the discrete time point of gathered data, and P [n] is the vibrational energy that current n-th is detected, and a [n] is to work as
Preacceleration angle value.
Further, present energy average EavgThe expression formula of [n] is as follows：
Eavg[n]=∑iaiP[n-i]+biEavg[n-i-1]
Wherein ai,biFor the coefficient of low pass filter, i is the cycle-index of current method flow process.
Further, the vibrational energy region average PavgExpression formula be：
Wherein L is the length of shift register collection.
Further, step S20 is shift register collection to be operated with time interval τ, and the τ is storage L/2 length
Time required for data.
Further, also include step S51, an oscillation counter is set, when vibration is judged to real external vibration, then
Oscillation counter adds 1.
A kind of adaptive thresholding value adjustment method of the present invention, carries out adaptive vibration detection by way of study, has
Effect improves the accuracy of vibration detection.While by way of judging vibration duration, effective eliminating system state change
The erroneous judgement for causing.The framework of the vibration detection of the present invention and adaptive vibration detection is can apply to together with vibration detection phase
In the scene of pass, there is preferable versatility.
Description of the drawings
The step of Fig. 1 is a kind of adaptive thresholding value adjustment method of the present invention is schemed.
Fig. 2 is a kind of adaptive vibration overhaul flow chart of adaptive thresholding value adjustment method of the present invention.
Fig. 3 is the vibration collection of illustrative plates of real external vibration.
Fig. 4 is the presence of vibration collection of illustrative plates when accidental type vibrates.
Specific embodiment
With reference to the accompanying drawings and examples the technical scheme in the embodiment of the present invention is clearly and completely described, shows
So, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.
For any object, its instantaneous acceleration value a [t], wherein t are certain instantaneous time point.
When system passes through 3D acceleration transducer, its acceleration is caught with the collection that certain sample frequency is lasting to equipment
During value, with regard to getable discrete series accekeration a [n], wherein n for gathered data discrete time point.In normal condition
Under, equipment is with intrinsic vibration frequency as[n] is operated.When additional vibratory is produced, changing vibration will produce one to equipment
The acceleration a of individual additional extra superpositionΔ[n].Detection vibration values now are：
A [n]=as[n]+aΔ[n]
This method is made an uproar by analyzing its intrinsic equipment bottom, oscillation intensity, the parameter such as vibration variation tendency, can so as to detect
The additional vibration that can occur, the vibration that such as switch gate action is brought to equipment.
Referring to Fig. 1 and Fig. 2, as being embodied as, flow chart the step of a kind of adaptive thresholding value adjustment method of the present invention,
Methods described comprises the steps：
Step S10, according to the current acceleration value of acceleration transducer, obtains current vibration energy
P [n]=a [n]2
Step S20, vibrational energy data flow enter low pass filter and obtain current vibrational energy average Eavg, which is concrete
Expression formula is Eavg[n]=ΣiaiP[n-i]+biEavg[n-i-1]；While vibrational energy data flow is also into shift register collection,
The length of the shift register is L, and time interval τ is operated to shift register collection, and τ generally stores L/2 length data
The required time, by taking average to interval the deposited vibrational energy data of the storage of shift register collection, then after deducting and adjusting
Vibrational energy average, obtain vibrational energy region average Pavg, its expression formula is as follows；
Step S30, vibrational energy region average pass through moving average method, calculate the dynamic threshold P of vibrational energyth[n]
=α Pavg+(1-α)Pth[n-1], wherein α are the coefficient of glide filter, typically can with span for (0,0.1] interior；
Step S40, sets marker bit flag and represents vibration persistent state, and initial marker bit flag is 0；Judge vibrational energy
Whether amount region average is more than dynamic threshold, the i.e. P of twiceavg2 P of ＞th[n], and whether marker bit flag is 0, is to mark
Position flag is set to 1, and records current time t1 as the vibration time started, and the judgement loop after so far the subthreshold updates is complete
Become, the renewal of next dynamic threshold is waited, turn again to step S10 and update vibrational energy region average and dynamic threshold；Instantly
When secondary dynamic threshold updates, if the vibrational energy region average after updating is still above the threshold value of twice, it is believed that acceleration sensing
Device is still within vibrating and vibrating in the middle of the repercussions for bringing, and does not carry out any operation；When vibrational energy region average less than etc.
In the dynamic threshold of twice, then marker bit is set to 0, and current time t2 is recorded as the vibration end time；
Step S50, judges to vibrate to start whether be less than preset value T, i.e. t with the time interval for terminating2-t1＜ T, is to sentence
Current vibration is determined for additional vibratory, vibration number adds 1；Otherwise judge current vibration holding as sporadic vibration, i.e. this vibration
Continuous overlong time, because of the vibration that equipment state change itself causes, and return to step S10.
Referring to Fig. 3 and Fig. 4, the vibration collection of illustrative plates of respectively real external vibration and accidental vibration, at vertical dashed lines labeled
For T.As can be seen that system vibration brings vibration duration generally longer, by judging the duration size of T, Ke Yiyou
Whether effect difference is real external vibration.
Above-described embodiment only not limits technical scheme described in the invention in order to the present invention to be described；Therefore, although
This specification with reference to each above-mentioned embodiment to present invention has been detailed description, but, the ordinary skill of this area
Personnel should be appreciated that still and the present invention can be modified or equivalent；And all without departing from the present invention spirit and
The technical scheme of scope and its improvement, its all should be covered in the middle of scope of the presently claimed invention.
Claims (6)
1. a kind of adaptive thresholding value adjustment method, it is characterised in that comprise the steps：
Step S10, according to the current acceleration value of acceleration transducer, obtains current vibration energy；
Step S20, vibrational energy data flow enter low pass filter and obtain current vibrational energy average；Vibrational energy data flow
Also into shift register collection, average is taken to interval the deposited vibrational energy data of the storage of shift register collection, then deducts adjustment
Vibrational energy average afterwards, obtains vibrational energy region average；
Step S30, vibrational energy region average pass through moving average method, calculate the dynamic threshold of vibrational energy；
Step S40, sets marker bit flag and represents vibration persistent state, and initial marker bit flag is 0；Judge vibrational energy area
Between average whether more than the dynamic threshold of twice, and whether marker bit flag is 0, is, marker bit flag is set to 1, and records and work as
Front moment t1 is used as the vibration time started, and turns again to step S10 renewal vibrational energy region average and dynamic threshold；Otherwise
When vibrational energy region average is less than or equal to the dynamic threshold of twice, then marker bit is set to 0, and records the conduct of current time t2
The vibration end time；
Step S50, judges that whether vibration starts with the time interval for terminating less than preset value, is then to judge current vibration as truly
External vibration；Current vibration is otherwise judged as sporadic vibration, and return to step S10.
2. adaptive thresholding value adjustment method according to claim 1, it is characterised in that the expression formula of the vibrational energy
For：
P [n]=a [n]2
Wherein P [n] is the vibrational energy that current n-th is detected, and a [n] is current acceleration value.
3. adaptive thresholding value adjustment method according to claim 2, it is characterised in that present energy average Eavg[n]
Expression formula as follows：
Eavg[n]=∑iaiP[n-i]+biEavg[n-i-1]
Wherein ai,biFor the coefficient of low pass filter, i is the cycle-index of current method flow process.
4. adaptive thresholding value adjustment method according to claim 3, it is characterised in that the vibrational energy region average
PavgExpression formula be：
Wherein L is the length of shift register collection.
5. adaptive thresholding value adjustment method according to claim 4, it is characterised in that step S20 be with time interval τ pair
Shift register collection is operated, and the τ is to store the time required for L/2 length data.
6. the adaptive thresholding value adjustment method according to claim 1 or 4, it is characterised in that also include step S51, sets
One oscillation counter, when vibration is judged to real external vibration, then oscillation counter adds 1.
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Cited By (4)
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| CN108791914A (en) * | 2017-05-03 | 2018-11-13 | 通用电气公司 | The method of display data in aircraft |
| CN111693763A (en) * | 2020-05-22 | 2020-09-22 | 科华恒盛股份有限公司 | Detection system for power module in modular electrical equipment |
| CN111819042A (en) * | 2018-02-28 | 2020-10-23 | 日产自动车株式会社 | Abnormality detection device and abnormality detection method |
| CN112188170A (en) * | 2020-09-30 | 2021-01-05 | 重庆市海普软件产业有限公司 | Outdoor intelligent digital holder control system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108791914A (en) * | 2017-05-03 | 2018-11-13 | 通用电气公司 | The method of display data in aircraft |
| CN111819042A (en) * | 2018-02-28 | 2020-10-23 | 日产自动车株式会社 | Abnormality detection device and abnormality detection method |
| CN111819042B (en) * | 2018-02-28 | 2023-06-13 | 日产自动车株式会社 | Abnormality detection device and abnormality detection method |
| CN111693763A (en) * | 2020-05-22 | 2020-09-22 | 科华恒盛股份有限公司 | Detection system for power module in modular electrical equipment |
| CN111693763B (en) * | 2020-05-22 | 2023-06-06 | 科华恒盛股份有限公司 | Detection system for power module in modularized electrical equipment |
| CN112188170A (en) * | 2020-09-30 | 2021-01-05 | 重庆市海普软件产业有限公司 | Outdoor intelligent digital holder control system and method |
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