CN103056776B - Data acquisition and transmission synchronization method for grinding machine processing environment monitoring system - Google Patents

Data acquisition and transmission synchronization method for grinding machine processing environment monitoring system Download PDF

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Publication number
CN103056776B
CN103056776B CN201210501191.0A CN201210501191A CN103056776B CN 103056776 B CN103056776 B CN 103056776B CN 201210501191 A CN201210501191 A CN 201210501191A CN 103056776 B CN103056776 B CN 103056776B
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monitoring system
circuit board
data
amp
wireless communication
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CN201210501191.0A
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CN103056776A (en
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郭隐彪
张东旭
刘强
王振中
潘日
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厦门大学
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Abstract

The invention provides a data acquisition and transmission synchronization method for a grinding machine processing environment monitoring system and belongs to the technical field of precision grinding processing. The precision grinding machine processing environment monitoring system is provided with a mother board circuit board, a power supply circuit board, a video acquisition and wireless communication circuit board, a sensor signal acquisition circuit board and a subsystem multi-functional interface circuit board. The method includes: 1) a sampling period T of the video acquisition and wireless communication circuit board of the monitoring system is used as a hardware synchronous signal of the monitoring system, a time value corresponding to a kth sampling moment of the video acquisition and wireless communication circuit board is tk, data acquisition modes of each circuit board of the monitoring system are set into equidistant acquisition, a hardware timer is installed on the mother board circuit board and used for detecting time difference delta tk between the data acquisition moment of each circuit board and the synchronous signal; 2) data change rate at the (tk-delta tk) moment is worked out; and 3) a data acquisition value at the synchronous signal moment of the monitoring system is worked out.

Description

For the Data acquisition and transmit method for synchronizing of grinding machine processing environment monitoring system

Technical field

The invention belongs to accurate grinding processing technique field, relate to a kind of Data acquisition and transmit method for synchronizing for grinding machine processing environment monitoring system.

Background technology

Along with the generally application in social every field of optics, electronic information technology, and the needs that Aero-Space, astronomy, national defence etc. are fast-developing, the demand of high-precision optical element constantly increases.(bibliography: Jiang Chen, Guo Yinbiao, Pan, Deng. from axle wedge shape aspheric surface parallel grinding and cutting and compensation technique research [J]. mechanical engineering journal, 2011,47 (3)) because precision grinding machining material removing rate is lower, therefore, it is possible to obtain the optical element of high accuracy and great surface quality, present superfine grinding technology has become indispensable key technology.(bibliography: Chen Dongxiang, Tian Yanling. precision grinding machining surface topography modeling and simulation method [J]. mechanical engineering journal, 2010,46 (13): 186-191.) technical merit of precision grinder equipment directly has influence on the precision of optical element, surface quality, yield rate and production efficiency.

In accurate grinding processing, processing environment (vibration, temperature and humidity etc.) there is considerable influence to machining accuracy, therefore, to the inside of grinding machine equipment, the significance that the optical manufacturing environmental factors such as external status carry out comprehensive monitoring obtains academia's common recognition gradually, (bibliography: Liang S Y, Hecker R L, Landers R G.Machining process monitoring andcontrol:the-state-of-the-art [J] .Journal of Manufacturing Science and Engineering.2004, 126 (5): 297-310.) improvement crudy is become, improve yield rate, the effective technical way of trouble saving and the assessment apparatus degree of wear.

Order precision grinder monitoring system needs to measure the various parameters of stable state in grinding, transient state and dynamic change, because the sampling period of front end signal Acquisition Circuit each in actual measurement is different, signal parameter frequency range is large, and the various acquisition modes such as time-devision system asynchronous collecting, channel parallel synchronous acquisition, audio frequency and video exist simultaneously, these factors add the difficulty of monitoring system information fusion, cause measure error to increase, system reliability declines.Multisensor Data Fusion technology is adopted to be the Main Means solving this problem, (bibliography: Rhee I, Lee J, Kim J.Clock synchronization in wireless sensor networks:an overview [J] .Sensors.2009,9:56-85.) but progress is unsatisfactory at present.First, the correlative study in Fusion field mainly concentrates on synchrodata and merges, and its prerequisite has sampling rate that is identical or integral multiple between supposition sensor, and be not suitable for precision grinder monitoring system; The research warm about asynchronous multiple sensors data is relatively less, mainly contain Asynchronous Optimal blending algorithm, based on the Fusion Estimation Algorithm of rational sampling, based on the Fusion Estimation Algorithm of Synchronous lifting, these algorithm amounts of calculation are large, and the difficulty of practical implementation is very large.

Summary of the invention

The object of the invention is to overcome the problem that precision grinder processing environment monitoring system Data acquisition and transmit frequency has nuance to cause system reliability to decline, a kind of Data acquisition and transmit method for synchronizing for grinding machine processing environment monitoring system is provided.

Grinding machine processing environment monitoring system of the present invention, is provided with motherboard circuit plate, power supply circuit board, video acquisition and wireless communication line plate, collecting sensor signal circuit board and subsystem Multifunctional interface circuit plate; Motherboard circuit plate is used for the data communication between each circuit board; Power supply circuit board is used for providing power supply signal for each circuit board; The data that video acquisition and wireless communication line plate transmit for receiving video-audio signal and other circuit boards, and these data are packed, then outwards sent by wireless network; The data that collecting sensor signal circuit board collects for receiving each sensor, and Data Fusion is carried out to initial data, be then transferred to video acquisition and wireless communication line plate; Subsystem Multifunctional interface circuit plate is used for carrying out communication with precision grinder digital control system, and carries out Data Fusion to the initial data obtained, and is then transferred to video acquisition and wireless communication line plate.

Data acquisition and transmit method for synchronizing for grinding machine processing environment monitoring system of the present invention, comprises the following steps:

1) using the hardware synchronization signal of the sampling period T of the video acquisition of monitoring system and wireless communication line plate as monitoring system, the time value that video acquisition is corresponding with the sampling instant of wireless communication line plate kth is t k, the mode setting each circuit board image data of monitoring system gathers as equidistant, hardware timer is installed by motherboard circuit plate, measures the time difference Δ t between the moment of each circuit board image data and synchronizing signal respectively k;

2) by Δ t kwith the actual measured value of monitoring system namely at (t k-Δ t k) measured value in moment adopt the compensation method based on linear extrapolation theory, calculate (t k-Δ t k) the data variation rate in moment calculation equation (1) is as follows:

v ^ ( t k - Δ t k ) = y ‾ ( t k - Δ t k ) - y ‾ ( t k - 1 - m - Δ t k - 1 - m ) ( t k - Δ t k ) - ( t k - 1 - m - Δ t k - 1 - m ) - - - ( 1 )

In formula, m is Δ t kthe integer part of/T, namely

3) data variation rate is utilized with the actual measured value of monitoring system and Δ t k, calculate the acquired data values of monitoring system in the synchronizing signal moment calculation equation (2) is as follows:

y ^ ( t k ) = y ‾ ( t k - Δ t k ) + v ^ ( t k - Δ t k ) Δ t k - - - ( 2 )

Due to the transmission cycle that the video acquisition of monitoring system and the sampling period T of wireless communication line plate are also monitoring systems, therefore just realize the synchronous of the Data acquisition and transmit of precision grinder processing environment monitoring system like this.

Compared with the prior art, the present invention has following outstanding advantages:

Using the hardware synchronization signal of the sampling period of video acquisition and wireless communication line plate as monitoring system, guarantee that the mode of each circuit board image data of monitoring system gathers for equidistant, hardware timer installed by motherboard circuit plate, the time difference Δ t between the moment of each circuit board image data and synchronizing signal can be measured respectively k; By the compensation method based on linear extrapolation principle, calculate the acquired data values of each circuit board in the synchronizing signal moment.Sampling period due to video acquisition and wireless communication line plate is also the transmission cycle of monitoring system, thus achieves the synchronous of the Data acquisition and transmit of precision grinder processing environment monitoring system.The method is simply applicable, and practical implementation is strong.

Accompanying drawing explanation

Fig. 1 is the structure composition frame chart of the precision grinder processing environment monitoring system of the embodiment of the present invention.

Fig. 2 is the time difference schematic diagram between the moment of each circuit board image data of monitoring system of the embodiment of the present invention and the moment (i.e. synchronizing signal) of the image data of video acquisition and wireless communication line plate.In fig. 2, the first half is the sampling period T of video acquisition and wireless communication line plate; Lower Half is the collection period of each circuit board of monitoring system.

Fig. 3 is the sampling period T of each circuit board in the monitoring system of the embodiment of the present invention 1with sampling period T(and the hardware synchronization signal of video acquisition and wireless communication line plate) there is time difference change curve in fine difference situation.Wherein, if T=1ms, dotted line is sampling period T 1=1.001ms, slightly larger than the situation of synchronizing signal T; Solid line is sampling period T 1=0.999ms, is slightly less than the situation of synchronizing signal T.In figure 3, transverse axis is time t (s); The longitudinal axis is time difference Δ t k(ms).

Fig. 4 is that the subsystem of the embodiment of the present invention is measured interval and affected time difference change curve under situation of change in time by digital control system closed-loop control.In the diagram, transverse axis is time t (s); The longitudinal axis is time difference Δ t k(ms).

Fig. 5 is the sampling period T of each circuit board in the monitoring system of the embodiment of the present invention 1when=1.001ms is slightly larger than synchronizing signal T=1ms, the Curve of the Measuring Error figure obtained.In Figure 5, dotted line is the error condition do not applied in method for synchronizing compensation situation that the present invention puts forward; Solid line is the error condition in the method for synchronizing compensation situation that puts forward of application the present invention; The longitudinal axis is measure error transverse axis is time t (s).

Fig. 6 is the sampling period T of each circuit board in the monitoring system of the embodiment of the present invention 1when=0.999ms is slightly less than synchronizing signal T=1ms, the Curve of the Measuring Error figure obtained.In figure 6, dotted line is the error condition do not applied in method for synchronizing compensation situation that the present invention puts forward; Solid line is the error condition after the method for synchronizing that puts forward of application the present invention compensates; Transverse axis is time t (s), and the longitudinal axis is measure error

Fig. 7 is that the subsystem of the embodiment of the present invention is measured interval and affected in time under situation of change by digital control system closed-loop control, the Curve of the Measuring Error figure obtained.In the figure 7, dotted line is the error condition do not applied in method for synchronizing compensation situation that the present invention puts forward; Solid line is the error condition after the method for synchronizing that puts forward of application the present invention compensates; Transverse axis is time t (s); The longitudinal axis is measure error curve a: uncompensated, curve b: compensate.

Detailed description of the invention

The invention will be further described by reference to the accompanying drawings for embodiment below.

See Fig. 1, the precision grinder processing environment monitoring system mentioned by the embodiment of the present invention is provided with motherboard circuit plate 1, power supply circuit board 2, video acquisition and wireless communication line plate 3, collecting sensor signal circuit board 4 and subsystem Multifunctional interface circuit plate 5.Motherboard circuit plate 1 is for the data communication between each circuit board.Power supply circuit board 2 is for providing power supply signal for other circuit boards of system.The data that video acquisition and wireless communication line plate 3 transmit for receiving video-audio signal and other circuit boards, and these data are packed, outwards sent by wireless network.The data that collecting sensor signal circuit board 4 collects for receiving each sensor, and Data Fusion is carried out to initial data, be then transferred to video acquisition and wireless communication line plate.Subsystem Multifunctional interface circuit plate 5 for carrying out communication with precision grinder digital control system, and carries out Data Fusion to the initial data obtained, and is then transferred to video acquisition and wireless communication line plate.

In data acquisition, nonsynchronous situation is measured: 1) although each circuit board is equal with the sample frequency design load of wireless communication line plate with video acquisition because following two kinds of reasons can produce, but because each board clock source is independent, cause each circuit board to certainly exist fine difference in sample frequency; 2) monitoring system is connected with numerical control system of grinding machine by serial ports, affects by digital control system closed-loop control, and the priority of external communication is lower, changes in time so subsystem measures interval, causes gathering the moment asynchronous with synchronizing signal.

Object of the present invention is exactly in the nonsynchronous situation of monitoring system Data acquisition and transmit, use the compensation method based on linear extrapolation principle, calculate the acquired data values of each circuit board in the synchronizing signal moment, and then realize Data acquisition and transmit synchronous of precision grinder processing environment monitoring system.The Data acquisition and transmit method for synchronizing of precision grinder processing environment monitoring system of the present invention, comprises the following steps:

1) using the hardware synchronization signal of the sampling period T of the video acquisition of monitoring system and wireless communication line plate as monitoring system, the time value that video acquisition is corresponding with the sampling instant of wireless communication line plate kth is t k, the mode setting each circuit board image data of monitoring system gathers as equidistant, hardware timer is installed by motherboard circuit plate, measures the time difference Δ t between the moment of each circuit board image data and synchronizing signal respectively k;

2) by Δ t kwith the actual measured value of monitoring system namely at (t k-Δ t k) measured value in moment utilize the compensation method based on linear extrapolation theory, calculate (t k-Δ t k) the data variation rate in moment its equation is as shown in the formula (1), and in formula, m is Δ t kthe integer part of/T, namely

v ^ ( t k - Δ t k ) = y ‾ ( t k - Δ t k ) - y ‾ ( t k - 1 - m - Δ t k - 1 - m ) ( t k - Δ t k ) - ( t k - 1 - m - Δ t k - 1 - m ) - - - ( 1 )

3) data variation rate is utilized with the actual measured value of monitoring system and Δ t k, calculate the acquired data values of monitoring system in the synchronizing signal moment equation is as shown in the formula (2).Because the sampling period of video acquisition and wireless communication line plate is also the transmission cycle of monitoring system, thus, the synchronous of the Data acquisition and transmit of precision grinder processing environment monitoring system is completed.

y ^ ( t k ) = y ‾ ( t k - Δ t k ) + v ^ ( t k - Δ t k ) Δ t k - - - ( 2 )

In order to check feasibility and the accuracy of the method, above-mentioned cause nonsynchronous two kinds of situations under calculate derived value respectively with direct measured value compared with the error amount of actual value, and then reached the object of checking.Two kinds of situations are specially: the video acquisition of known monitoring system and wireless communication line plate sampling period and hardware synchronization signal are T=1ms, in a first scenario, and each circuit board sampling period T 1value and mainboard have fine difference, consider two kinds of situations: 1) sampling period T 1slightly larger than synchronizing signal T, T 1=1.001ms; 2) sampling period T 1be slightly less than synchronizing signal T, T 1=0.999ms.Certainty of measurement δ 0=0.001, measured signal is 50Hz sinusoidal signal, i.e. y (t)=10sin (2 π t).In the latter case, set return data measurement between be interposed between change at random between 0.8ms-1.2ms.Certainty of measurement δ 0=0.001, measured signal is 10Hz sinusoidal signal, i.e. y (t)=sin (20 π t).

As shown in Figure 2, although each circuit board is equal with the sample frequency design load of wireless communication line plate with video acquisition, because each board clock source is independent, cause each circuit board in sample frequency, certainly exist fine difference Δ t k; In addition, monitoring system is connected with numerical control system of grinding machine by serial ports, affects by digital control system closed-loop control, and the priority of external communication is lower, changes in time so subsystem measures interval, causes gathering the moment asynchronous with synchronizing signal, there is tiny time difference Δ t k.

As shown in Figure 3, the sampling period T of each circuit board of monitoring system 1the time difference change curve in fine difference situation is had with the sampling period T of video acquisition and wireless communication line plate and hardware synchronization signal.Wherein, set by above-mentioned, T=1ms, dotted line is sampling period T 1=1.001ms, slightly larger than the situation of synchronizing signal T, solid line is sampling period T 1=0.999ms, is slightly less than the situation of synchronizing signal T.As can be seen from the figure, along with the advance of time, the time difference becomes large gradually, and whenever arriving one-period, difference becomes maximum 1ms, next repeats the change procedure in previous cycle.Because the change of time difference, stability and the reliability of monitoring system greatly can be reduced.

As shown in Figure 4, subsystem measures interval affects time difference change curve under situation of change in time by digital control system closed-loop control.Set by above-mentioned, between the measurement of return data, be interposed between change at random between 0.8ms-1.2ms.So can find out in figure, time changing curve is mixed and disorderly at random, does not have rule to follow.

As shown in Figure 5, at the sampling period T of each circuit board of monitoring system 1when=1.001ms is slightly larger than synchronizing signal T=1ms, the measure error do not applied after the methods and applications that the present invention puts forward compares.Wherein, dotted line is the error condition do not applied in method for synchronizing compensation situation that the present invention puts forward; Solid line is the error condition after the method for synchronizing that puts forward of application the present invention compensates.Can find out clearly from figure, when not applying the method for synchronizing that the present invention puts forward, error presents cyclically-varying from-0.06-0.04-0, this has not met the required precision of monitoring system, after application this method, near " 0 " i.e. X-axis that error amount is stabilized in, this meets the required precision of monitoring system.

As shown in Figure 6, at the sampling period T of each circuit board of monitoring system 1when=0.999ms is slightly less than synchronizing signal T=1ms, the measure error do not applied after the methods and applications that the present invention puts forward compares.Wherein, dotted line is the error condition do not applied in method for synchronizing compensation situation that the present invention puts forward; Solid line is the error condition after the method for synchronizing that puts forward of application the present invention compensates.Can find out clearly from figure, when not applying the method for synchronizing that the present invention puts forward, error from 0-0.04---0.06 presents cyclically-varying, this has not met the required precision of monitoring system, after application this method, near " 0 " i.e. X-axis that error amount is stabilized in, this meets the required precision of monitoring system.

As shown in Figure 7, measuring interval at subsystem to affect by digital control system closed-loop control in time under situation of change, and the measure error do not applied after the methods and applications that the present invention puts forward compares.Wherein, dotted line is the error condition do not applied in method for synchronizing compensation situation that the present invention puts forward; Solid line is the error condition after the method for synchronizing that puts forward of application the present invention compensates.Can find out clearly from figure, when not applying the method for synchronizing that the present invention puts forward, error presents from-0.05-0-0.05--0--0.05 and is similar to periodic change, this has not met the required precision of monitoring system, after application this method, near " 0 " i.e. X-axis that error amount is stabilized in, this meets the required precision of monitoring system.

As can be seen from Fig. 1 ~ 7, after method compensation deals proposed by the invention, error obviously reduces, and meets certainty of measurement requirement, and greatly can improve the reliability and stability of monitoring system, method for synchronizing proposed by the invention is effective and feasible.

Claims (1)

1., for the Data acquisition and transmit method for synchronizing of grinding machine processing environment monitoring system, described grinding machine processing environment monitoring system is provided with motherboard circuit plate, power supply circuit board, video acquisition and wireless communication line plate, collecting sensor signal circuit board and subsystem Multifunctional interface circuit plate; Motherboard circuit plate is used for the data communication between each circuit board; Power supply circuit board is used for providing power supply signal for each circuit board; The data that video acquisition and wireless communication line plate transmit for receiving video-audio signal and other circuit boards, and these data are packed, then outwards sent by wireless network; The data that collecting sensor signal circuit board collects for receiving each sensor, and Data Fusion is carried out to initial data, be then transferred to video acquisition and wireless communication line plate; Subsystem Multifunctional interface circuit plate is used for carrying out communication with numerical control system of grinding machine, and carries out Data Fusion to the initial data obtained, and is then transferred to video acquisition and wireless communication line plate;
It is characterized in that said method comprising the steps of:
1) using the hardware synchronization signal of the sampling period T of the video acquisition of monitoring system and wireless communication line plate as monitoring system, the time value that video acquisition is corresponding with the sampling instant of wireless communication line plate kth is t k, the mode setting each circuit board image data of monitoring system gathers as equidistant, hardware timer is installed by motherboard circuit plate, measures the time difference Δ t between the moment of each circuit board image data and synchronizing signal respectively k;
2) by Δ t kwith the actual measured value of monitoring system namely at (t k-Δ t k) measured value in moment , adopt the compensation method based on linear extrapolation theory, calculate (t k-Δ t k) the data variation rate in moment calculation equation (1) is as follows:
v ^ ( t k - Δ t k ) = y ‾ ( t k - Δ t k ) - y ‾ ( t k - 1 - m - Δ t k - 1 - m ) ( t k - Δ t k ) - ( t k - 1 - m - Δ t k - 1 - m ) - - - ( 1 )
In formula, m is Δ t kthe integer part of/T, namely
3) data variation rate is utilized with the actual measured value of monitoring system and Δ t k, calculate the acquired data values of monitoring system in the synchronizing signal moment calculation equation (2) is as follows:
y ^ ( t k ) = y ‾ ( t k - Δ t k ) + v ^ ( t k - Δ t k ) Δ t k - - - ( 2 ) .
CN201210501191.0A 2012-11-29 2012-11-29 Data acquisition and transmission synchronization method for grinding machine processing environment monitoring system CN103056776B (en)

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Publication number Priority date Publication date Assignee Title
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CN1986156A (en) * 2006-12-20 2007-06-27 东华大学 Ultraprecise grinder with two stages of feeding mechanism and its control method
CN201573116U (en) * 2009-09-28 2010-09-08 宁波摩士集团股份有限公司 Cylindrical grinding process multi-parameter real-time monitoring device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2340558Y (en) * 1997-04-29 1999-09-29 东风汽车公司 Online monitoring system of internal grinder by monitoring courses
CN1986156A (en) * 2006-12-20 2007-06-27 东华大学 Ultraprecise grinder with two stages of feeding mechanism and its control method
CN201573116U (en) * 2009-09-28 2010-09-08 宁波摩士集团股份有限公司 Cylindrical grinding process multi-parameter real-time monitoring device

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Title
无心磨削动态监测系统的研制;陈晓南等;《机械制造》;19940531(第05期);第35-36页 *
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