CN109870231A - Automatic Metrology Verification System and Identification Algorithm of Vibration Measuring Instrument - Google Patents
Automatic Metrology Verification System and Identification Algorithm of Vibration Measuring Instrument Download PDFInfo
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Abstract
本发明涉及振动测量仪器自动化计量检定系统，包括标准振源发生系统、测量结果识别系统、计算机程控系统；标准声源发生系统包括：ZigBee收发单元、ARM系统、程控信号源、电机控制单元和振动台；测量结果识别系统包括:被测仪器显示屏、摄像头、图像电信号接口单元、ARM系统、检测电路、AC接口、DC接口和ZigBee收发单元；计算机程控系统包括：ZigBee收发单元、ARM系统和计算机上位机。本发明的有益效果是：结合标准振源发生系统、测量结果识别系统、计算机程控系统形成的振动测量仪器自动化计量检定系统，实现了振动测量仪器检定的自动化，大大节省了检定过程的人力输出和时间成本。
The invention relates to an automatic metrology verification system for vibration measuring instruments, including a standard vibration source generation system, a measurement result identification system, and a computer program control system; the standard sound source generation system includes: a ZigBee transceiver unit, an ARM system, a program-controlled signal source, a motor control unit and a vibration source. The measurement result identification system includes: the display screen of the instrument under test, the camera, the image electrical signal interface unit, the ARM system, the detection circuit, the AC interface, the DC interface and the ZigBee transceiver unit; the computer program control system includes: ZigBee transceiver unit, ARM system and computer host computer. The beneficial effects of the invention are: the automatic measurement and verification system of vibration measuring instruments formed by combining the standard vibration source generating system, the measurement result identification system and the computer program control system, realizes the automation of the verification of the vibration measuring instruments, and greatly saves the manpower output and the cost of the verification process. Time costs.
Description
Technical field
The present invention relates to automatic gauge verification system more particularly to vibration measuring instrument automatic gauge verification systems.
Background technique
Vibration measuring instrument includes analysis of vibration signal and vibration level size measuring instrument, these instruments are much for ring
The fields such as border protection, belong to national measurement calibration equipment, according to national verification standard, analyze for vibration measurement, such as vibrate
The 1/3oct of sound level is analyzed, and national regulations need to carry out the multiple spot centre frequency of analysis instrument the test of bandwidth performance, is needed
The amplitude and frequency of artificial constantly setting measuring signal, while the index after test is subjected to artificial contrast, workload is very
Greatly.For vibration level (including vertical (W.B.z) the weighted vibration level of whole body, whole body level (W.B.x-y) weighted vibration level, and not weighted
(Lin) measure) measurement of size, it is provided according to the detection of ISO8041 or GB/10071, needs to test a variety of vibration frequency weighteds
Artificial calibrating and index comparison are carried out with the linearity and decibel sizes values of time weighted, workload is also very big.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of structurally reasonable, vibration measurements of high degree of automation
Analysis instrument measurement verification system and recognizer.To achieve the above object, the invention adopts the following technical scheme:
Vibration measuring instrument automatic gauge verification system, including standard vibration source generating system, measurement result identifying system,
Computer program-control system；
Standard source generating system include: ZigBee Transmit-Receive Unit, ARM system, programme-controlled signal source, motor control unit and
Shake table；ARM system receives the standard electric signal for the requirement output that computer program-control system is sent by Zigbee Transmit-Receive Unit
Signal waveform, frequency and amplitude or standard vibration level size, all the way pass through circuit system carry out program control signal output, another way
The frequency of shake table is hit by control motor control unit output and amplitude realizes the output of vibration level, while passing through ARM system
To the signal frequency and height analysis of vibration level signal, the requirement for whether reaching standard vibration level seen, if be not achieved, adjusts ARM system
The control to motor control unit output frequency and associated motor of uniting exports, and realizes motor control unit guidance striker to vibration
The shock dynamics and frequency of platform, until the output of standard vibration level；The self-calibration process of realization standard vibration level；Programme-controlled signal source passes through
ARM system controls AD9850 and exports corresponding signal waveform, amplitude and frequency by direct digital frequency synthesis technology.When output is marked
When the vibration level signal or electric signal of standard, the ready order of signal is sent by ZigBee Transmit-Receive Unit and identifies system to measurement result
System；
Measurement result identifying system includes: tested instrument display screen, camera, electric image signal interface unit, ARM system
System, detection circuit, AC interface, DC interface and ZigBee Transmit-Receive Unit；ARM system receives standard by ZigBee Transmit-Receive Unit
The ready order that vibration level generating system is sent, ARM system realize camera to tested by image telecommunication interface unit
The measurement result of instrument display screen carries out image recognition, is surveyed by AC interface, DC interface of the detection circuit to tested instrument
Amount；ARM system gets and sends the measurements to computer program-control system by ZigBee Transmit-Receive Unit after measurement result；
Computer program-control system includes: ZigBee Transmit-Receive Unit, ARM system and computer host computer；ARM system passes through
The measurement result that ZigBee Transmit-Receive Unit obtains measurement result identifying system passes through USB interface again and data is sent to sequence controlled computer
Host computer procedure, measurement result is sent in the output entry of preset probation redport by host computer procedure, then, passes through USB
Waveform, amplitude and the frequency that interface sends the signal source output requirement required in next vertification regulation are identified to measurement result is
System, measurement result identifying system pass through ZigBee Transmit-Receive Unit again and send standard vibration source system for signal source output requirement
System.
The recognizer of the measurement result identifying system of vibration measuring instrument automatic gauge verification system, including following step
It is rapid:
S1. vertical (W.B.z) the weighted vibration level of vibration level signal whole body, whole body level (W.B.x- are carried out by AC interface first
Y) digital assay of weighted vibration level, specific as follows:
The 1/3oct analysis for completing 1Hz to 80Hz first, carries out according to following steps:
1) a 8 rank Butterworth filter devices are designed with the design method of analog filter；
The low pass chi square function of butterworth filter is expressed as follows:
Interim N takes 8,8 rank low-pass filters is designed, to obtain system function H (S)；
2) predistortion is carried out to analog frequency；
It is being that, in order to guarantee that each edge frequency point is the frequency pre-established, filter is cut using two-wire row converter technique
Only frequencies omegaCWith stopband side frequency ω s, it is pre- abnormal before determining simulation low-pass filter system function must to carry out as the following formula frequency
Become:
H (s)=Ha(s/Ωc) (5)
3) transmission function of digital filtering is found out using Bilinear transformation method；
It is summarized as follows with the process of Bilinear transformation method design digital filter:
Normalize the frequency transformation of analog low-pass prototype to digital band-pass filter:
4) inputs a sampled value again, calculates an output valve, seeks the root mean square of each output valve；
5) the frequency band root mean square acceleration analyzed by 1/3oct is multiplied by the weighted factor, then takes r.m.s. and obtain
Corresponding spectrum overlapping acceleration:
In formula: ai--- the accelerated speed effective value (m/s that the i-th frequency range is surveyed in third-octave frequency spectrum2)；
ki--- the corresponding spectrum overlapping factor of the i-th frequency range in third-octave frequency spectrum；
It is analyzed by the calculating of above formula and 1/3oct, so that it may measure corresponding spectrum overlapping acceleration；
Weighted vibration level can be obtained as the following formula by weighted acceleration:
In formula: aw--- weighted acceleration virtual value (m/s2)；
a0--- reference acceleration, a0=10-6m/s2；
It is calculated by the digital collection of (10) formula, so that it may corresponding weighted vibration level；
Corresponding character match module is formed by these measurement results；
S2 obtains the measurement result of corresponding not weighted through ARM system sampling analysis by DC interface, which forms
The respective symbols matching module of not weighted in optical identification measurement result；
The measurement result display screen of tested instrument is realized ARM system by RS232 interface by digital camera by S3
It reads, carries out optical identification.
As preferred: the algorithm of the optical identification of the step S3 are as follows:
It identifies that the image of object obtains and gray processing is realized by camera combination electric image signal unit, know for character
Not, select median filtering technology realize image smoothing, by threshold value set realize image binaryzation, from binaryzation data into
Line character segmentation, the method for selection is template matching method, then carries out character knowledge by extracting after image thinning using framework characteristic
Not；It is extracted using framework characteristic, reduces corresponding calculation amount, only in the character feature and above-mentioned S1, S2, S3 step extracted
The feature of the measurement result Character mother plate of formation is matched；An image to be identified is given, by micronization processes
Character skeleton image, or the bianry image for eliminating noise not refined, it is horizontal and vertical all to cross at regular intervals, so
The number across character picture, that is, number of crossings are successively write down afterwards；Template image is gathered in advance, extracts each template
Pass through number, store with a matrix type, as eigenmatrix, after the feature for having extracted each character, as database
It preserves；After obtaining single character picture to be identified, traversing times are equally extracted, are loaded into template data and mould
The traversing times matrix of plate, successively makes comparisons, and calculates related coefficient, maximum related coefficient is exactly recognition result；Long and width etc.
It is divided into five parts, is unable to equal part, round numbers part calculates traversing times in each position of halving, intersects each time, is denoted as primary
It passes through, shares ten characteristic values in this way；Calculate poor method for distinguishing:
X can represent binary character to be identified in formula, and P is the eigenmatrix of template, and obtained matrix of differences is D；D=
d11 2+…+d25 2For the number that the two correlation is measured, that maximum corresponding templates of the number mean that recognition result.
The beneficial effects of the present invention are:
1) vibration measurement that combined standard vibration source generating system, measurement result identifying system, computer program-control system are formed
Automation equipment measurement verification system realizes the automation of vibration measuring instrument calibrating, the people of verification process is greatly saved
Power output and time cost.
2) vibration level self-calibration technique, programme-controlled signal source design and Radio Transmission Technology is combined to devise the generation of standard vibration source
System provides the technological means of innovation for the realization of vibration measuring instrument automatic gauge verification system.
3) method for combining digital image understanding technology and hardware interface circuit to detect greatly improves measurement result reading
The accuracy and resolving ability taken also provides the technology of innovation for the realization of vibration measuring instrument automatic gauge verification system
Means.
4) combining wireless transmission technology, embedded system technology and computer programming devise computer program-control system
System.The system is the calibrating measurement that vibration measuring instrument automatic gauge verification system realizes tested calibration regulatory requirements
The acquisition of the output order and verification result of signal and the printout of probation redport.
Detailed description of the invention
Fig. 1 is the system block diagram of standard vibration source generating system；
Fig. 2 is measurement result identifying system；
Fig. 3 is computer program-control system block diagram；
Fig. 4 is vibration measuring instrument automatic gauge verification system functional block diagram；
Fig. 5 is ARM system design general frame figure；
Fig. 6 is ARM unit circuit diagram；
Fig. 7 is DSP unit circuit diagram；
Fig. 8 is HPI bus connection figure；
Fig. 9 is A/D Acquisition Circuit figure；
Figure 10 is that ARM extends out SDRAM；
Figure 11 is that ARM extends out FLASH；
Figure 12 is that DSP extends out FLASH and SDRAM；
Figure 13 is usb circuit figure of the present invention；
Figure 14 is RS232 interface circuit diagram；
Figure 15 is RJ45 interface circuit figure；
Figure 16 is power system circuit figure；
Figure 17 is programme-controlled signal source circuit diagram；
Figure 18 is motor control unit figure；
Figure 19 is image recognition principle block diagram.
Specific embodiment
The present invention is described further below with reference to embodiment.The explanation of following embodiments is merely used to help understand this
Invention.It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, also
Can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the protection scope of the claims in the present invention
It is interior.
The system includes three part compositions, including standard vibration source generating system, measurement result identifying system, computer journey
Control system.Its system design principle block diagram is as shown in Figure 4.Implementation steps are as follows:
Computer program-control system requires to receive and dispatch by ZigBee according to each in the vertification regulation for being detected instrument first
Waveform, frequency and the amplitude or standard vibration level size that unit sends corresponding measuring signal are to standard vibration source generating system, standard
Vibration source generating system is believed standard vibration level according to requiring to generate corresponding standard vibration level signal or electric signal to tested instrument
Number or the instruction that has sent of electric signal measurement result identifying system, measurement result identification system be sent to by ZigBee Transmit-Receive Unit
After system receives the instruction, starting ARM system measures the identification of result, detects phase according to image recognition technology and circuit
In conjunction with method, obtain correct measurement result, the result be then sent to computer program-control by ZigBee Transmit-Receive Unit
System, computer program-control system obtain after related calibrating entry results through the host computer procedure write-in corresponding result of calibration certificate
Column.Then start waveform, frequency and the amplitude of the measuring signal of next vertification regulation requirement to standard vibration source generating system.It is logical
Cross constantly circulation, finally realize the calibrating project of all vertification regulation requirements, simultaneous computer stored program controlled according to these as a result,
The calibration certificate for forming specification comes from printer output.The automatic gauge inspection of vibration measurement analysis instrument can thus be completed
It is fixed.
ARM system in above system designs general frame using following system, as shown in Figure 5.The general frame was both
ARM can be given full play to, the real-time control of system and good man-machine interface are realized and played DSP and image and audio are believed
Number analysis processing capacity.
Wherein ARM is using S3C2410A as central control module.S3C2410A is the very high ARM of a cost performance
core SOC.Dominant frequency with 203MHz has the processing speed requirement needed to audio signal digit detection, there is USB interface,
It can be communicated with computer, there is multiple serial ports, the control to ZigBee Transmit-Receive Unit may be implemented.Physical circuit figure is as schemed
Shown in 6:
Wherein DSP is designed using TMS320VC5502 chip, which is a high-performance, low-power consumption, fixed-point number
Word signal processor fully meets audio signal and image signal process ability.Its physical circuit figure is as shown in Figure 7.
The connection of ARM unit and DSP unit uses HPI bus, and connection type is as shown in Figure 8.
The acquisition of vibration level signal is realized using high-speed a/d, select TMS320AIC23B, which uses advanced Σ mono-
△ oversampling technique can provide the hits of 16bit, 20bit, 24bit and 32bit under the sample rate of 8kHz to 96kHz
According to.The output signal-to-noise ratio of ADC and DAC is respectively up to 90dB and 100dB.The performance meets the data acquisition energy of audio signal enough
Power.DSP to the control of A/D is realized by I2C interface.Its circuit is as seen in figure 9.
It is used for DSP and ARM and extends out FLASH and SDRAM, increase its program capacity and Nonvolatile data result
Storage capacity.
SDRAM model K4S561632C-TC75, the capacity 4Banks*16Bit*4M that ARM is extended out, that is,
256Mbit converts into 32M byte.Memory of two pieces of K4S561632C-TC75 as ARM is used in this system, circuit theory is such as
Shown in Figure 10.
S3C2410 extends out the K9F1208U0B that NAND FLASH is one piece of Samsung company, and capacity is 64M byte, electricity
Road principle is as shown in figure 11.
TMS320VC5502 extends out FLASH and the circuit theory of SDRAM is as shown in figure 12.
ARM system realizes data exchange and includes tri- type of RJ45, RS232 and USB to the control of ZIGBEE wireless module
Type interface, usb circuit principle are as shown in figure 13.
The RS232 serial ports controller used in this system is MAX3232, and circuit theory is as shown in figure 14.
The circuit of S3C2410A and RJ45 interface is comparatively more complicated, it is necessary to use 802.3 Ethernet of IEEE
Controller is attached.We use CS8900A to this ethernet controller, this is also more commonly used one piece at present
Ethernet control chip, circuit theory are as shown in figure 15.
There are four the power supplys used in ARM system, including 5V, 3.3V, 1.8V and 1.26V.Due to 3.3V and 1.26V electricity
The order of pressure power supply requires, it is necessary to and 1.26V powers prior to 3.3V, therefore devises the circuit powered in order here,
Use the power management chip of Liang Kuai TI company, TPS75733 (3.3V) and TPS76801 (1.26V).
Program control signal source circuit uses AD9850 for the circuit design of core, and physical circuit is as shown in figure 17:
Program control signal source unit ARM system inputs frequency control word to AD9850 and phase control words realize sine wave
Frequency and phase controlling, while being controlled by AD7521 12 D/A amplitudes, 1/4096 amplitude precision control can be reached
System, can realize the technical requirements of programme-controlled signal source in standard source generating system well.
The calculating of frequency control word is as follows:
If the frequency of output signal is CLKIN, the frequency control word of AD9850 is △ PHASE, then the relationship between three
Are as follows:
△ PHASE=(fouT × 232)/CLKIN.
The calculating of phase control words is as follows:
There are 5 bits for phase controlling in AD9850, so, the precision of phase controlling is 360./ 25=11.25., with two
System is expressed as 00001, according to actual needs, different phase control words is arranged, so that it may realize accurate phase controlling.Table
1 gives the corresponding relationship between phase shift and phase control words.
Corresponding relationship between 1 phase shift of table and phase control words
| Phase shift (degree) | 0 | 22.5 | 45 | 67.5 |
| Phase control words | 00000 | 00010 | 00100 | 0010 |
| Phase shift (degree) | 180 | 202.5 | 225 | 247.5 |
| Phase control words | 10000 | 10010 | 10100 | 10110 |
| Phase shift (degree) | 90 | 112.5 | 135 | 157.5 |
| Phase control words | 01000 | 01010 | 01100 | 01110 |
| Phase shift (degree) | 270 | 292.5 | 315 | 337.5 |
| Phase control words | 11000 | 11010 | 111000 | 11110 |
The frequency/phase control word one of AD9850 shares 40 bits, wherein 32 bits are frequency control word, 5 bits are phase
Position control word, 1 bit are power supply suspend mode control, and last 2 bit is work method control, control 1 power supply suspend mode in,
2 work method controls are set as " 000 ".The every allocation table of AD9850 parallel mode loading frequency/phase control words such as table 2
It is shown.
Every allocation table of 2 frequency/phase control word of table
| Control word | Data[7] | Data[6] | Data[5] | Data[4] |
| W0 | Phase—b4(MSB) | Phase—b3 | Phase—b2 | Phase—bl |
| Wl | Freq—b31(MSB) | Freq—b30 | Freq—b29 | Freq—b28 |
| W2 | Freq—b23 | Freq—b22 | Freq—b21 | Freq—b20 |
| W3 | Freq—b15 | Freq—b14 | Freq—b13 | Freq—b12 |
| W4 | Freq—b7 | Freq—b6 | Freq—b5 | Freq—b4 |
| Control word | Data[3] | Data[2] | Data[1] | Data[0] |
| WO | Phase—bO(LsB) | Power D0wn | Control (=0) | Control (=0) |
| Wl | Freq—b27 | Freq—b26 | Freq—b25 | Freq—b24 |
| W2 | Freq—b19 | Freq—b18 | Freq—b17 | Freq—b16 |
| W3 | Freq—b11 | Freq—b10 | Freq—b9 | Freq—b8 |
| W4 | Freq—b3 | Freq—b2 | Freq—bl | Freq—bo(LsB) |
In loaded in parallel mode, by 8 position datawires, continuous 5 times AD9850 is written in 40 bit datas by load every time,
WCLK and FQUD is used to determine address and load data sequence, and Wx (X=0,1,2,3,4) is written in the rising edge of WCLK, so
The rising edge of WCLK, DATA should be ready to and keep stable, and the rising edge of FQUD is by 40 bit data write frequencies/phase data
Register, while address pointer is directed toward first register WO.When initialization, high level is set by FQUD, WCLK is set as
Low level, parallel mode writing process are as follows: firstly, FQUD switchs to low level by high level, AT89C51 exports data WO；
Later, control WCLK switchs to high level by low level, then switchs to low level by high level, writes control word WO, AT89C51 at this time
According to the process of write-in WO, it is sequentially written in W1, W2, W3, W4；Finally, AT89C51 controls FQUD, it is made to switch to height by low level
Level, completes the write-in of 40 bit datas, and address pointer is directed toward W0, performs standard for next write frequency/phase control words
It is standby.
Motor control unit controls multiple LN298N units using ARM and realizes that the rotation of multiple motors controls multiple strikers pair
The control of the shock dynamics and velocity interpolation vibration level amplitude and speed of shake table, single LN298N element circuit figure such as Figure 18 institute
Show.
The frequency of impact and width that motor drives striker are controlled by the frequency that ARM system controls the PWN wave of L298N input
Degree control, realizes the control of vibration level amplitude and speed.
ZigBee Transmit-Receive Unit uses CC2420 for the ZigBee Transmit-Receive Unit module of core chips.Using ZigBee networking
Technology realizes the wireless communication of three points well.Its channel from way of search, the topological structure of StarNet and entirely shake hands
(Fully handshaked) agreement ensure that the stability of data transmission.Two-way is realized using RS232 interface with ARM system
Letter.
It can be realized well in vibration measuring instrument automatic gauge verification system by the design of said units circuit
The function of three systems (standard vibration source generating system, measurement result identifying system, computer program-control system).For three systems
Circuit design be specifically described it is as follows:
Standard vibration source generating system: RS232 interface is controlled by ARM system (Fig. 5) and is realized to ZigBee transceiver module
Communication receives the specific requirement of the standard vibration level signal or standard electric signal of the requirement output that computer program-control system is sent,
On the one hand pass through ARM system control AD9850 unit (Figure 17) realization standard electric signal corresponding signal amplitude, frequency, phase
Standard electric signal interface is given in control output, on the other hand controls motor-drive circuit (Figure 18) by ARM system, realizes multiple hit
For the amplitude and frequency of shake table vibratory impulse, for the accurate control of amplitude and frequency that motor control controls multiple strikers
System, is connected on shake table by standard vibration sensor and is acquired, by the high speed of the signal input ARM system after acquisition
A/DTMS320AIC23B carries out digital detection analysis, and whether analysis vibration level reaches the requirement of standard, if do not reached, pass through
The control for changing ARM system control motor-drive circuit, realizes the Oscillation Amplitude and frequency of shake table, by constantly feeding back, most
Vibration level signal output definitely is realized eventually.The circuit system has following innovative design: (1) accurate program controlled signal source realizes
Optional frequency control, the accurate amplitude to 1/4096 in multiple waveforms, audio range control contour performance signal source and fill
The design requirement set.(2) by vibration level self calibration feedback technique, the output of standard vibration level signal is realized.(3) pass through ZigBee
Networking technology, the multiple spot for realizing standard acoustic signal generating system and computer program-control system and measurement result identifying system are logical
Letter.(4) rigorous analysis of vibration level signal is realized by digital detection technology.Digital detection includes vertical (W.B.z) weighted of whole body
The vibration level digitalization index of vibration level, the digitlization of whole body level (W.B.x-y) weighted vibration level and AC signal is analyzed.
Vertical (W.B.z) the weighted vibration level of whole body, the digitized process of whole body level (W.B.x-y) weighted vibration level are as follows:
The 1/3oct analysis for completing 1Hz to 80Hz first, carries out according to following steps:
(1) the fertile hereby bandpass filter of a 8 rank Barts is designed with the design method of analog filter；
(2) predistortion is carried out to analog frequency；
(3) transmission function of digital filtering is found out using Bilinear transformation method；
(4) inputs a sampled value, calculates an output valve, seeks the root mean square of each output valve.
The frequency band root mean square acceleration analyzed by 1/3oct is multiplied by the weighted factor, then takes r.m.s. and obtain phase
The spectrum overlapping acceleration answered:
In formula: ai--- the accelerated speed effective value (m/s that the i-th frequency range is surveyed in third-octave frequency spectrum2)；
ki--- the corresponding spectrum overlapping factor of the i-th frequency range in third-octave frequency spectrum.
It is analyzed by the calculating of above formula and 1/3oct, so that it may measure corresponding spectrum overlapping acceleration.
Weighted vibration level can be obtained as the following formula by weighted acceleration:
In formula: aw--- weighted acceleration virtual value (m/s2)；
a0--- reference acceleration, a0=10-6m/s2。
It is calculated by the digital collection of (2) formula, so that it may corresponding weighted vibration level.
Measurement result identifying system: controlling communication of the RS232 interface realization to ZigBee transceiver module by ARM system,
After receiving the ready order of signal that standard acoustic signal generating system method is come.ARM system completes following work: (1)
The AC interface that tested instrument provides is docked to high-speed a/d TMS320AIC23B acquisition interface and carries out digital detection analysis.(2) will
The built-in A/D translation interface that the DC interface that tested instrument provides is connected to ARM2410 offer carries out DC analysis.(3) by tested instrument
The measurement result display screen of device passes through I by digital camera2C bus realizes the reading of ARM system, passes through optical character identification
Technology combination AC interface and DC interface analysis are as a result, measure the identification of result.
Algorithm is analyzed as follows in the identification process:
S1 passes through AC interface first and carries out vertical (W.B.z) the weighted vibration level of vibration level signal whole body, whole body level (W.B.x-y)
The digital assay of weighted vibration level, specific as follows:
The 1/3oct analysis for completing 1Hz to 80Hz first, carries out according to following steps:
1) a 8 rank Butterworth filter devices are designed with the design method of analog filter；
The low pass chi square function of butterworth filter is expressed as follows:
Interim N takes 8,8 rank low-pass filters is designed, to obtain system function H (S).
2) predistortion is carried out to analog frequency；
It is being that, in order to guarantee that each edge frequency point is the frequency pre-established, filter is cut using two-wire row converter technique
Only frequencies omegaCWith stopband side frequency ω s, it is pre- abnormal before determining simulation low-pass filter system function must to carry out as the following formula frequency
Become:
H (s)=Ha(s/Ωc) (5)
3) transmission function of digital filtering is found out using Bilinear transformation method；
It is summarized as follows with the process of Bilinear transformation method design digital filter:
Normalize the frequency transformation of analog low-pass prototype to digital band-pass filter:
4) inputs a sampled value again, calculates an output valve, seeks the root mean square of each output valve.
5) the frequency band root mean square acceleration analyzed by 1/3oct is multiplied by the weighted factor, then takes r.m.s. and obtain
Corresponding spectrum overlapping
Acceleration:
In formula: ai--- the accelerated speed effective value (m/s2) that the i-th frequency range is surveyed in third-octave frequency spectrum；
ki--- the corresponding spectrum overlapping factor of the i-th frequency range in third-octave frequency spectrum.
It is analyzed by the calculating of above formula and 1/3oct, so that it may measure corresponding spectrum overlapping acceleration.
Weighted vibration level can be obtained as the following formula by weighted acceleration:
In formula: aw--- weighted acceleration virtual value (m/s2)；
a0--- reference acceleration, a0=10-6m/s2。
It is calculated by the digital collection of (10) formula, so that it may corresponding weighted vibration level.
Corresponding character match module is formed by these measurement results.
S2 obtains the measurement result of corresponding not weighted through ARM system sampling analysis by DC interface, which forms
The respective symbols matching module of not weighted in optical identification measurement result.
The measurement result display screen of tested instrument is realized ARM system by RS232 interface by digital camera by S3
It reads, carries out optical identification, the algorithm such as Figure 19.
It identifies that the image of object obtains and gray processing is realized by camera combination electric image signal unit, know for character
Not, select median filtering technology realize image smoothing, by threshold value set realize image binaryzation, from binaryzation data into
Line character segmentation, the method for selection is template matching method, then carries out character knowledge by extracting after image thinning using framework characteristic
Not.It is extracted using framework characteristic, can be reduced corresponding calculation amount, only in the character feature and above-mentioned S1, S2 step extracted
The feature of the measurement result Character mother plate of formation is matched.An image to be identified is given, can be by refinement
The character skeleton image of processing, be also possible to not refine eliminates the bianry image of noise, horizontal and vertical all with fixation
Interval scribing line, then successively write down the number across character picture, that is, number of crossings.Template image is gathered in advance,
Extract each template passes through number, stores with a matrix type, as eigenmatrix, extracted the feature of each character with
Afterwards, it is preserved as database.After obtaining single character picture to be identified, traversing times are equally extracted, are loaded into
The traversing times matrix of template data and template, successively makes comparisons, and calculates related coefficient, maximum related coefficient is exactly to identify
As a result.In the design is long and width, is divided into five parts, is unable to equal part, and round numbers part is calculated in each position of halving
Traversing times intersect each time, are denoted as and once pass through, and share ten characteristic values in this way.Calculate poor method for distinguishing:
X can represent binary character to be identified in formula, and P is the eigenmatrix of template, and obtained matrix of differences is D.D=
d11 2+…+d25 2For the number that the two correlation is measured, that maximum corresponding templates of the number mean that recognition result.
In above process, corresponding character mould is obtained in conjunction with the measurement data that AC interface, DC interface measure acquisition
Block carries out module matching, can play the role that the fast area positioning (2) of (1) measurement result makes up image recognition processing
The slow and not accurate enough disadvantage of speed.By the algorithm, it is able to carry out measurement result identification fast and accurately.
After identification 30 seconds, if there is image recognition region still no-fix, illustrate the AC interface or DC interface of instrument
The interface signal of offer is wrong, and the wrong conclusion of measurement result is sent to computer program-control system by ZigBee module,
It determined AC interface or whether DC interface be correct.If correct identification, correct recognition result is sent to by ZigBee module
Computer program-control system.
There is the circuit system following innovative design to be embodied in by passing through image on the basis of AC, DC analysis combination
Also tested instrument is able to verify that while the shortcomings that identification technology can quickly and accurately find measurement result, compensate for image recognition
The correctness of AC, DC interface of offer.
Computer program-control system: controlling communication of the RS232 interface realization to ZigBee transceiver module by ARM system, real
Now the reading of the measurement result of measurement result identifying system is tied measurement by the USB interface or RJ45 interface of ARM system
Fruit is read into computer system, and measurement result is written in the detection corresponding data base entries of regulation by computer system
It goes.Then the standard signal output for starting next detection regulation requires to be sent to the generation of standard sound by ZigBee group net unit
System.Computer programming realizes above-mentioned function using VB language combination SQL database technology.The innovative major embodiment of the circuit
Realize that computer program-control system sends out standard sound by ZigBee networking technology and computer programming in computer program-control
The two-way communication of raw system and measurement result identifying system and the formation and output of calibration certificate.
Claims (3)
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