CN101221422A - Portable vibration data collector and method based on embedded technology - Google Patents

Portable vibration data collector and method based on embedded technology Download PDF

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Publication number
CN101221422A
CN101221422A CNA2008100556290A CN200810055629A CN101221422A CN 101221422 A CN101221422 A CN 101221422A CN A2008100556290 A CNA2008100556290 A CN A2008100556290A CN 200810055629 A CN200810055629 A CN 200810055629A CN 101221422 A CN101221422 A CN 101221422A
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China
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data
module
interface
chip microcomputer
arm minimum
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CNA2008100556290A
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Chinese (zh)
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CN100573378C (en
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崔玲丽
高立新
刘晓松
张建宇
胥永刚
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北京工业大学
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Publication of CN100573378C publication Critical patent/CN100573378C/en

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention relates to the data acquisition and equipment fault diagnosis field, in particular to a portable vibration data acquisition device and a method based on embedded technology. The device comprises an acceleration transducer, an acceleration transducer interface module, a capacitance isolation module, a programmed control amplifying module, a self-adapting antialiasing filter, an AD converter and the bus interface of the converter which are connected in turn; moreover, the device also comprises an ARM minimum system, a DIM144 interface module, a singlechip as well as an electronic label module, a keyboard, a power source management and voltage conversion module which are connected with the singlechip; in addition, the programmed control amplifying module and the self-adapting antialiasing filter are also connected with a singlechip 8. The device communicates with an upper computer through a serial port to assign point inspection task, and transmits the sampling frequency in the point inspection task to the singlechip; moreover, the singlechip sets the lowpass cut-off frequency of the antialiasing filter according to the sampling frequency. With low power consumption, convenient operation and powerful data analysis function, the device has the characteristics of real time and accuracy.

Description

A kind of portable vibration data collector and method based on embedded technology
Technical field
The present invention relates to data acquisition and equipment fault diagnosis field, a kind of specifically portable vibration data collector and method based on embedded technology
Background technology
The data collection and analysis instrument is a kind of hand-held analyzer device that has the instrument of field notes, analytic function or have the status data function of field notes, off-line analysis machinery and equipment.State parameter signal on the equipment that it records with vibration transducer or process sensor is as input, be equipped with various Measurement and analysis technology and diversified display format and form a detection system, be mainly used in machinery and equipment is carried out regularly going the rounds multiple fields such as status monitoring and fault diagnosis.Its energy and computing machine are formed independently monitoring diagnosis system together, are one of computer-aided diagnosis means of machinery and equipment.
Both at home and abroad the available data acquisition and analysis instrument is of a great variety, as China's sun 106 of Shanghai China positive detecting instrument company limited, but mainly has the shortcoming of the following aspects: at first from its processor inside, majority is to be core with 8 or 16 single-chip microcomputers; Be subjected to the restriction of its processor processing speed, these data acquisition units often do not possess data analysis function or data analysis function is very poor, and owing to lack the support of operating system, let alone the notion of graphic user interface, be unfavorable for that the workman does a little easy fault diagnosises at the scene; Secondly, what existing data acquisition unit was done on real-time neither be fine, and the AD sampling precision of setting is not high, and what directly cause is the distortion of signal in frequency domain; Moreover the gear of its frequency overlapped-resistable filter low-pass cut-off frequencies is limited, when setting sample frequency bigger restriction is arranged, and versatility is bad; Some enterprises requires data collection and analysis instrument that the function of spot check management will be arranged, this normally a lot of products do not possess or do not meet the requirement of enterprise; At last, the data way of recycling of available data collector is inflexible, and what adopt usually is serial communication, must come data collection by special upper computer software, has reduced the spot check efficient of enterprise.
Summary of the invention
Purpose of the present invention is exactly the above-mentioned deficiency that overcomes prior art, a kind of portable vibration data collector and method based on embedded technology proposed, this device provides a kind of establishing method of the sample frequency of AD accurately, has guaranteed the accuracy of signal in frequency preanalysis; Provide several data to derive mode simultaneously, made things convenient for the recovery of field data.
In order to address the above problem, the present invention has taked following technical scheme.Include the acceleration transducer, acceleration transducer interface module 1, electric capacity isolation module 2, amplification filtering module 3, self-adaptation frequency overlapped-resistable filter 4 and AD conversion and bus interface 5, DIM144 interface module 6, ARM minimum system 7, single-chip microcomputer 8 and the electronic module tag 9 that is connected with single-chip microcomputer 8, keyboard 10, power management and the voltage transformation module 11 that connect successively, program control amplification module 3 also links to each other with single-chip microcomputer 8 with self-adaptation frequency overlapped-resistable filter 4.Wherein:
Described acceleration transducer is used for gathering the acceleration signal of target device vibration, and exports with the form of voltage;
Described acceleration transducer interface module 1 is used for providing the voltage and the constant current source of excitation to acceleration transducer;
The communication interface 12 of ARM minimum system 7 and LCD and touch screen interface 13 are drawn by DIM144 interface module 8;
ARM minimum system 7 links to each other with host computer by communication interface, link to each other with single-chip microcomputer 8 by spi bus, ARM minimum system 7 is downloaded the spot check task from host computer, and sending the sample frequency in the spot check task to single-chip microcomputer 8, single-chip microcomputer 8 is 1/2nd of a sample frequency by the low-pass cut-off frequencies of selecting different resistor networks to set self-adaptation frequency overlapped-resistable filter 4;
AD conversion and bus interface 5 thereof link to each other with ARM minimum system 7 by DIM144 interface module 6, and described AD conversion and interface module 5 thereof are that simulating signal is carried out sending ARM minimum system 7 to after the AD conversion according to the sample frequency of setting; The setting of the sample frequency of AD conversion is to control by the modulating pulse of the hardware PWM timer generation of ARM minimum system, has reached the setting of accurate sample frequency.
Described electronic module tag 9 is that the interface by unibus reads the information in the device power subtab imformosome in the single-chip microcomputer 8;
Described keyboard interface is meant the keyboard by the expansion of single-chip microcomputer 8 ports; By the single-chip microcomputer scanning encoding and coding is sent to the keyboard driver of ARM minimum system;
Described power management and voltage transformation module 11, when the external world is a lithium cell charging during for DC, also the voltage transitions that lithium battery is exported becomes multi-channel analog power supply, digital power and the insulating power supply that system needs, and finish the control that enables of each road power supply in conjunction with single-chip microcomputer 8, the unlatching of the power supply of control acceleration transducer interface module 1, electric capacity isolation module 2, program control amplification module 3, self-adaptation frequency overlapped-resistable filter 4 and AD conversion and bus interface 5 thereof, close, do not carrying out under the situation of data acquisition, system is with its power remove;
LCD and touch screen interface thereof link to each other with ARM minimum system 7 by DIM144 interface 6, finish the demonstration and the input of graphical interfaces.
Described communication interface 12 includes USB, SD and serial ports.
A kind of portable vibration collecting method based on embedded technology, this method realizes according to the following steps:
1) ARM minimum system 7 is downloaded the spot check task by serial line interface 18 from host computer, and the spot check task is saved on the SD card by SD card 17;
Described spot check task is a text, comprises 10 entries, thes contents are as follows:
Task time;
Mission number;
The path of measuring point;
The ID of electronic tag number;
The sample frequency of setting;
The sample length of sampling;
The data type of measuring point;
The direction of measuring point comprises horizontal measuring point and vertical measuring point;
The group number of the sample of gathering;
Interval time between group, unit is a millisecond;
2) 7 pairs of spot check tasks of ARM minimum system are resolved, and the frequency that the parameter of the hardware timer by setting ARM minimum system 7 is set the AD conversion is a sample frequency, and the SPI agreement sends to single-chip microcomputer 8 with sample frequency simultaneously;
3) single-chip microcomputer 8 is set at 1/2 of sample frequency by selecting different resistor networks with the low-pass cut-off frequencies of self-adaptation frequency overlapped-resistable filter 4 according to the sample frequency that receives;
4) consistance of checking measuring point and spot check task;
Described verification method is: by electronic tag interface 9 coding that the electronic labeling information on the equipment writes down body is read in single-chip microcomputer 8, single-chip microcomputer 8 is issued ARM minimum system 7 with this coding, ARM minimum system 7 is compared this coding with ID number of electronic tag in the spot check task, the identical task of then representing is corresponding with measuring point, can execute the task;
5) behind the affirmation measuring point, sensor is installed to appointed positions;
6) carry out the spot check task: ARM minimum system 7 sends start command of acquisition to single-chip microcomputer 8, and single-chip microcomputer 8 is opened the power supply of corresponding module, and ARM minimum system 7 starts the AD conversion, the beginning data acquisition;
7) after the simulating signal of the measuring point that collects of acceleration transducer is passed through electric capacity isolation module 2, amplification filtering module 3, self-adaptation frequency overlapped-resistable filter 4 successively, carry out the AD conversion;
8) data that are converted to of AD are kept in the internal memory of ARM minimum system 7 (complement code of 2 systems of the sensor output voltage that records, 16), and data-switching are become the floating number of corresponding acceleration; Simultaneously, the ARM minimum system stops acquisition instructions for single-chip microcomputer 8 transmissions, closes the power supply of correlation module after single-chip microcomputer 8 receives and instructs;
9) data analysis: the data that collect are analyzed by the data analysis software in the ARM minimum system 7, and the result that will analyze is presented on the LCD in the mode of figure;
10) data storage: on the SD card that AD data converted result is carried to equipment by core dump with the predetermined data document form;
The form of described data file is as follows:
Data file comprises data head and data volume two parts; Data head is divided into 11, is set to sch except first, represents that this file is the spot check task data, and outside interim measuring point data file was distinguished mutually, remaining 10 data item with the spot check task was in full accord, had write down the various information of sample; Data volume is a sampling number and a quantity floating number entry of organizing the number product, and each is separator with the line feed.
11) data derive: to USB flash disk, perhaps the SD card is unloaded the host computer sense data by the USB interface derived data in the communication interface (USB, SD, serial ports) 12 of system, perhaps reclaim the software data collection by serial communication by the host computer data.
Compared with prior art, beneficial effect of the present invention is as follows:
1) powerful flush bonding processor-with ARM9 is 32 flush bonding processors of S3C2410X of core; The hardware supported of powerful operation capacity is provided for the data analysis function of system;
2) support of embedded OS-native system adopts flush type LINUX operating system (2.4 kernel); For realizing that the friendly graphic user interface and the data analysis function of complete function provide software platform;
3) hardware structure-employing master-slave controller and adopt interface board and the hardware arrangement of core board has flexibly made things convenient for the upgrading of system;
4) embedded data acquisition graphic user interface analysis software that is powerful, friendly, hommization-native system adopts 3.5 inches giant-screens, high resolving power (320 * 240) true color (65536 look) LCD, the band touch screen function, and based on graphical user's software of MiniGUI.The software of native system has the powerful data analysis function, and the data analysing method various commonly used of time domain and frequency domain is provided, and is convenient to do at the scene a little easy equipment fault diagnosiss.
5) real-time high, the establishing method of AD sample frequency accurately, guaranteed the accuracy of signal in frequency preanalysis;
6) mode-provide serial ports, USB and three kinds of data of SD card to derive mode is provided for flexile data, has made things convenient for the recovery of field data.
Description of drawings
Fig. 1 is the whole hardware structure block diagram of data collection and analysis instrument
Fig. 2 is a S3C2410X minimum system structured flowchart
Fig. 3 is the circuit theory diagrams of self-adaptation frequency overlapped-resistable filter
Fig. 4 is the interface circuit of AD modular converter ADS7805 and S3C2410X
Fig. 5 is the application circuit schematic diagram of slave controller single chip computer AT 89S52 module
Fig. 6 is the structured flowchart of power management module
Fig. 7 is the circuit theory diagrams of power management module
Fig. 8 is that the process flow diagram of data acquisition scheme 1 is a software architecture diagram
Fig. 9 is a software architecture diagram
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, present embodiment comprises ARM minimum system 7, acceleration vibration transducer, acceleration transducer interface module 1, electric capacity isolation module 2, program control amplification module 3, self-adaptation anti-aliasing filter module 4, AD conversion and bus interface module 5, DIM144 interface module 6, electronic tag interface 9, keyboard interface module 10, single-chip microcomputer 8, power management and voltage transformation module 11, communication interface (USB, SD, serial ports) and touch screen interface module 13.Wherein, acceleration vibration transducer, acceleration transducer interface module 1, electric capacity isolation module 2, program control amplification module 3, self-adaptation anti-aliasing filter module 4, AD conversion and bus interface module 5 thereof, DIM144 interface module 6 link to each other successively.Electronic tag interface 9, keyboard interface 10 are connected with AT89S52 one-chip computer module 8.One-chip computer module is connected with power management and voltage transformation module 11, and is connected with ARM minimum system 7 by DIM144 interface module 6.Communication interface (USB, SD, serial ports) 12, LCD and touch screen interface module 13 are connected with the ARM minimum system by the DIM144 interface module.Described power management and voltage transformation module 11 all have annexation with all modules of system.
As shown in Figure 2, the ARM minimum system comprises that dominant frequency reaches circuit such as the SDRAM of NAND FLASH, 32M of powerful 32 embedded ARM processor S3C2410X, 8M of 230MHz and other reset circuit, power supply, jtag interface, on this basis, transplanted flush type LINUX operating system, on operating system, developed special-purpose powerful graphical user's program, come control data collection and data analysis by patterned, friendly user program.For gathering and the vibration acceleration signal at analytical industry scene provides a kind of general, portable, powerful, friendly interface, easy to operate, and enterprise's spot check management system integrative solution of combining closely.
What present embodiment adopted on the overall architecture of hardware is the core board (module 7 in the accompanying drawing 1, with S3C2410X is the ARM minimum system of core) add interface board (all modules in the accompanying drawing 1 except that module 7, with the AT89S52 single-chip microcomputer is controller) split design, interface board is connected with the interface device of core board by a DIM144 (module 6 in the accompanying drawing 1), communicates by letter by spi bus between primary processor (S3C2410X) and the slave controller (AT89S52 single-chip microcomputer).
In the present embodiment, system is designed to the structure of master-slave controller and split module, its most outstanding advantage is to make things convenient for the software and hardware upgrading.Have at interface board under the situation of change, only need interior driver of modification single-chip microcomputer and the interior relevant driver of core board to get final product; And the data collection and analysis software in the core board also can be realized upgrading easily.Moreover, adopt the split structure Design, under the situation that single parts go wrong, can easily achieve the replacement of module.Make things convenient for the maintenance of system.
Core board (seeing accompanying drawing 2) is the nucleus module of total system, is the hardware platform of flush type LINUX operating system, also is the hardware platform of whole application software operation.Functions such as the collection of responsible data, storage, analysis.This ARM chip has the external interface of enriching, and as Memory Controller, lcd controller, SPI interface controller, IIC interface controller, hardware timer etc., has simplified the difficulty of user at the expansion external interface greatly.This module is exactly to utilize an ARM minimum system of its abundant Peripheral Interface structure.
In this module, the NAND FLASH storer of having expanded a 8M is as program storage; Expanded the internal memory of the SDRAM of a 32M as system, simultaneously, ARM resource that this system is used such as data line, address wire, LCD interface, timer interface, USB mouth, serial ports, SPI mouth, RTC and some interrupt interface resources are drawn out to the interface base plate by a DIM144.
The main effect of interface board be to the signal that collects nurse one's health, AD conversion and provide a complete portable product power solution for total system.It comprises slave controller AT89S52 single-chip microcomputer, signal amplification, filtering circuit, power management and voltage transformation module, A/D conversion and an interface module thereof and the interface circuit (USB, serial ports, SD card, LCD interface, keyboard interface etc.) that some are general; The major function of single-chip microcomputer is each functional module of control interface board and communicates by spi bus and ARM core board.
Below each module is elaborated respectively.
As shown in Figure 3, self-adaptation frequency overlapped-resistable filter module 4 in the present embodiment, be meant that single-chip microcomputer is set to 1/2nd of sample frequency by automatic selection associated resistor with the low-pass cut-off frequencies of frequency overlapped-resistable filter according to the sample frequency of setting, the undesired signal of filtering high frequency, prevent to produce frequency alias, totally 8 gears, cutoff frequency is from 500Hz to 20KHz.
According to Shannon's sampling theorem, only sample frequency greater than the frequency that is sampled signal more than 2 times the time just can frequency of occurrences aliasing.And the effect of frequency overlapped-resistable filter will be limited to below the N/2 (Hz) by the cutoff frequency of acquired signal when sample frequency is N (Hz) exactly.The designed self-adaptation frequency overlapped-resistable filter of native system is meant the cutoff frequency of the sample frequency automatic selecting signal that sets according to system, satisfies Shannon's sampling theorem.
UAF42 is a high performance universal 2 rank wave filters of TI company, only needs outside resistance element seldom just can be configured to various low passes, logical, the Hi-pass filter of band very easily.When UAF42 is operated in the low pass pattern, need external 3 resistance (RF1, RF2 and Rq) to determine its low-pass cut-off frequencies.The change of resistance value will cause the variation of low-pass cut-off frequencies.This module is exactly around this principle, the low-pass filter of forming a quadravalence with two UAF42 cascades, the resistor network of having formed one 8 groups (every group of 3 resistance) by 4 MAX308 and MAX309 multi-way switch, and come the resistance of one group of correspondence of gating multi-way switch by three pins of single-chip microcomputer, reach the purpose of setting different low-pass cut-off frequencies.Gou Zao frequency overlapped-resistable filter cost is low, simple in structure in this way, and versatility is good.And native system set 8 grades cutoff frequency, from 500Hz to 20KHz, can satisfy the requirement of versatility fully.
Default 8 groups of different sample frequency, 0.5k, 1k, 2k, 4k, 5k, 10k, 20k and 25k.
The output signal of amplification filtering module 3 is connected with the input of self-adaptation frequency overlapped-resistable filter module 4, after single-chip microcomputer 8 receives this parameter of sample frequency from ARM minimum system 7, calculate low-pass cut-off frequencies, at this moment can control one group of resistance value of gating multi-way switch correspondence by three pins of single-chip microcomputer 7, promptly set the low-pass cut-off frequencies of frequency overlapped-resistable filter.Output to AD conversion and interface module thereof through the signal behind the anti-aliasing filter.
The major function of notebook data collector is that the signal to the single vibration passage carries out the AD conversion, and the frequency band range of the signal that we are concerned about is less than 20K; Analog signal voltage scope ± 10V; The conversion figure place of considering the interface of AD converter and CPU in addition and taking all factors into consideration requirement has finally been determined a AD converter ADS7805 of TI company.ADS7805 is 16 successive approximations of a high precision (SAR) AD converter, the highest inversion frequency 100K.In instrument and meter, be widely used.
Because ADS7805 is different with the voltage of S3C2410 logic level, so on data bus, met 16 bit parallels, two-way, ternary, the level switch module SN74LVC16T245 of a 5V commentaries on classics 3.3V, as shown in Figure 4, this module has enable pin, and two address pin (nGCS1 and MA2) of S3C2410 are connected with this enable pin through a Sheffer stroke gate.When serving the address on the bus of address, unblocked level translation interface module is sent data, be high-impedance state during the zero-address signal.The TOUTO pin is the PWM timer TIMERO output terminal of S3C2410, is connected with ADS7805 behind the door through non-, and frequency as requested produces the modulating pulse of AD conversion.AD conversion and bus interface circuit thereof are seen Fig. 4.
The framework of the master-slave controller that present embodiment adopts, last level controller are the ARM minimum system (Fig. 2) that S3C2410X constitutes, and are the hardware platforms of operating system and application program operation; Following level controller is single chip computer AT 89S52 (Fig. 5), mainly realizes reading and the scanning encoding of keyboard of the control function of modules such as Keysheet module on the interface base plate and power management, program control amplification, auto adapted filtering and electronic tag.It with S3C2410X between communicate by letter by SPI communication protocol, it sends to the S3C2410X minimum system except the keyboard coding with scanning, when carrying out data acquisition, reception is from the order of S3C2410X minimum system, by parsing, finish relevant setting to amplifying circuit, anti-aliasing filter circuit and power management module to order.
The mcu resource configuration instruction:
P0.5-P0.7, P2.5-P2.7, P3.2, P3.3 and P1.0: be connected the power enable output of the state of the power supply of detection system and each module of control system with power management with the voltage conversion module; (seeing accompanying drawing 7)
P1.2: the unibus of electronic module tag is connected;
P1.5-P1.7, the SPI communication interface between P1.4:ARM minimum system and the single-chip microcomputer, these four pins are connected with a 6PIO port with the spi bus of ARM minimum system.
P3.0-P3.1: these two pins are connected with two pins of programmable amplifier, can select 1,2,4,8 times enlargement factor;
P3.4-P3.6: these three pins are connected with the pin of the multi-way switch of frequency overlapped-resistable filter, can realize 8 kinds of low-pass cut-off frequencies;
Power management module, except when extraneous be lithium cell charging during for DC, also the voltage transitions that lithium battery is exported becomes multi-channel analog power supply, digital power and the insulating power supply that system needs, and finish the control that enables of each road power supply in conjunction with single-chip microcomputer, the unlatching of the power supply of control acceleration transducer interface module, electric capacity isolation module, program control amplification module, self-adaptation frequency overlapped-resistable filter and AD conversion and bus interface thereof, close, do not carrying out under the situation of data acquisition, system is with its power remove, with maximized saving electric energy, prolong the working time of instrument;
Because what present embodiment adopted is lithium battery power supply, and system works needs various voltages, mainly contains ± 12V, 5V and 3.3V.These needed voltages all are to provide through conversion by lithium battery.In addition, the module that system has does not need to power under certain situation, so this is can be with its power-off, this relates to the problem of power management again.Present embodiment has provided the power management scheme of a complete portable set.As shown in Figure 6 and Figure 7, the core of this module is MAX8662, and the MAX8662 chip is that U.S. letter company releases aly is the high performance power management chip based on single lithium battery power supply system.Its inner integrated two synchro switch rectifier, the boost rectifier that can drive 2-7 LED, 4 step-down linear rectifiers and one are the linear-charging circuit of lithium cell charging.MAX8662 has the intelligent power selector switch, have externally fed power supply and powered battery simultaneously from situation under, he can between the switching of intelligence, such as, external power source can not provide system needed electric current, and at this moment, battery also will provide electric energy for system; If the external power source ability has residue, charging circuit will start, for battery charges.Simultaneously, MAX8662 inside also has temperature protection circuit, is used for time of regulation battery charge to avoid the cause thermal damage battery.Native system utilizes LX1, LX2, this 4 tunnel output of OUT4, OUT5 to be respectively other module for power supply of system.
A little functional unit is arranged: power switching module LTC2950 in this module.It is a low for consumption, wide range input voltage, button connection/shutoff controller.This device has the button input that an independently programmable turns on and off the debounce time.This chip also comprises a simple Microprocessor Interface, so that carried out correct inter-process before outage.LTC2950 can work in the wide region of 2.7V to 26V, adapts to various input power supplys.Low-down quiescent current (6uA) is very suitable for battery powered portable instrument.
The PB pin of LTC2950 connects the switch (power switch button on the keyboard of instrument) of power supply, LTC2950 adopts system's lithium battery power supply, KILL and INT pin connect the pin of single-chip microcomputer, and the EN pin then connects the output enable end of passage 1 of the MAX8662 of power management module.Press after the push button, the level that is about to the PB pin drags down, and then the EN pin will be exported the output that high level is opened the passage LX1 of MAX8662.The LX1 output voltage is 3.3V.It is that (that 3.3V changes that 5V adopts is the supply voltage switch conversion chip TPS63002 of a high efficiency output current of TI company up to 1.8A to the 5V voltage that needs of single-chip microcomputer, is widely applied in the various portable electric appts of single lithium battery power supply that this road power supply changes the 5V module converts through 3.3V.It mainly contains following characteristics: conversion efficiency is up to 96%; Adjustable Output Voltage, 1.2-5.5V; Two kinds of patterns of voltage raising and reducing are changed automatically; Quiescent current 50uA); What so at first obtain powering is single-chip microcomputer, will open the power supply of ARM chip after single-chip microcomputer starts, communicating by letter between foundation and the single-chip microcomputer after ARM opens.Other modules are in the needs power supply, and the ARM minimum system just sends instructions to single-chip microcomputer, open other power supply output by single-chip microcomputer.
After the shutdown button was pressed, single-chip microcomputer sent this signal to the ARM chip simultaneously with receiving off signal earlier, and within the time of 1024ms, the preliminary work before the shutdown will be done by system, afterwards, and system cut-off.
Electric capacity isolation module in this module needs insulating power supply just can reach good isolation effect, and for this reason, native system has adopted isolation power module of voltage regulation DCH010512D.DCH010512D is the insulating power supply module of a single-ended input bipolarity output, input voltage 5V ± 10%, be output as ± 12.Use two insulating power supply modules in the native system, main effect has 2 points: at first one for the electric capacity isolation module provides ± insulating power supply of 12V, and the 5V power supply of another one and system is isolated, for system's amplification filtering circuit provides both-end voltage.
The acquisition and analysis instrument that provides in the present embodiment has two kinds of acquisition modes, is respectively spot check mission mode and interim measuring point pattern:
First kind of acquisition mode-spot check mission mode as shown in Figure 8, may further comprise the steps:
1) this device communicates by the serial ports and the host computer of communication interface modules, receives the spot check task to the ARM minimum system from host computer, and on the SD card that the spot check task is carried by the SD interface system of being saved in;
The spot check task definition is as follows:
The spot check task is a text, comprises 10 entries (fixed order), and each record entry is end mark with the newline.Following (the expansion back is a note herein, does not exist in the actual file):
20071112 (task time, 8 characters are respectively the date);
0004 (mission number, 4 characters, from 0001 to 9999);
Certain steel mill/first steelworks/No. four blast furnace/left gudgeon gear case/2# bearing (path of measuring point);
90fe120a (ID number of 64 long electronic tags that 16 systems are represented, a corresponding unique measuring point);
100000 (sample frequency of the setting that 10 systems are represented, the Hz of unit);
4096 (sample lengths of the sampling that 10 systems are represented);
1 (data type of measuring point, 1 expression acceleration, 2 expression speed, 3 expression displacements can only be set at 1 at present);
0 (direction of measuring point, the horizontal measuring point of 0 expression, the vertical measuring point of 1 expression);
2 (the group number of the sample that will gather, maximal value are relevant with sample length);
20 (interval time between group, unit is a millisecond).
2) the ARM minimum system is resolved the spot check task, and the parameter of the hardware timer 0 by setting the ARM minimum system is set the frequency of AD conversion, simultaneously this parameter of sample frequency is sent to single-chip microcomputer;
3) single-chip microcomputer is set at 1/2 of sample frequency according to this parameter of sample frequency of receiving with the low-pass cut-off frequencies of frequency overlapped-resistable filter module;
The method of setting the low-pass cut-off frequencies of frequency overlapped-resistable filter mainly is meant:
After the ARM minimum system reads spot check task relevant information, it mainly is sample frequency, this information is passed to down the level controller single-chip microcomputer by the SPI agreement, single-chip microcomputer can be automatically according to these sample frequency data that obtain by selecting different resistor networks, the low-pass cut-off frequencies of frequency overlapped-resistable filter is set to 1/2nd of sample frequency; Native system provides the nearly low-pass cut-off frequencies of 8 gears, is respectively 500Hz, 1KHz, and 2KHz, 4KHz, 5KHz, 10KHz, 20KHz, 25KHz can satisfy the requirement of versatility fully.
4) consistance of checking measuring point and spot check task;
Described verification method is: by the electronic tag interface of this device, the coding of the record of the electronic labeling information on equipment body is read in single-chip microcomputer, single-chip microcomputer is issued the ARM minimum system with this coding, the ARM minimum system is compared with this coding and with the coding in the spot check task, the identical task of then representing is corresponding with measuring point, can execute the task;
5) behind the affirmation measuring point, sensor is installed to appointed positions;
6) carry out the spot check task, the ARM minimum system sends start command of acquisition to single-chip microcomputer, and single-chip microcomputer is opened the power supply of corresponding module, and the ARM minimum system starts the AD conversion, the beginning data acquisition;
7) after the simulating signal of the measuring point that collects of acceleration transducer is passed through electric capacity isolation, amplification, anti-aliasing filter successively, carry out the AD conversion.
8) data that are converted to of AD are kept in the internal memory of ARM minimum system (complement code of 2 systems of the sensor output voltage that records, 16), and data are changed, and data-switching are become the floating number of corresponding acceleration; Simultaneously, the ARM minimum system sends to single-chip microcomputer and stops acquisition instructions, closes the power supply of correlation module after single-chip microcomputer receives and instructs;
9) data analysis; The data that collect are analyzed by the data analysing method in the native system, and the result that will analyze is presented on the LCD in the mode of figure;
10) data storage: on the SD card that the data converted result is carried to equipment by core dump with the form of predetermined data file;
The form of described data file is as follows:
Data file comprises data head and data volume two parts; Data head is divided into 11, is set to outside the sch (represent that this file is the spot check task data, distinguish mutually with interim measuring point data file) except first, and remaining 10 data item with the spot check task is in full accord, has write down the various Useful Informations of sample; Data volume is a sampling number and a quantity floating number entry of organizing the number product, and each is separator with the line feed.
11) data derive: the usb interface module derived data that can pass through system also can unload the SD card to USB flash disk, to the host computer sense data, can also reclaim the software data collection by the special data of host computer by traditional serial communication.
Second kind of acquisition mode-interim measuring point pattern may further comprise the steps:
1) measuring point is carried out the setting of acquisition parameter by keyboard; Mainly comprise information such as the time interval, alarming value between sampling number, sample frequency, enlargement factor, the number of sets of sample, group.
2) the ARM minimum system is resolved parameter, and sets the AD inversion frequency by the parameter of setting the timer in the ARM minimum system 7, simultaneously enlargement factor and these two parameters of sample frequency is sent to single-chip microcomputer;
3) single-chip microcomputer is according to the low-pass cut-off frequencies of program control amplification multiple of receiving of parameter setting and selection frequency overlapped-resistable filter;
4) degree of will speed up sensor is installed in appointed positions;
5) send start command of acquisition to system hardware by keyboard, the ARM minimum system is opened AD by opening timing device 0 and is transformed, the beginning data acquisition;
6) step 7 of common mode 1 is changed the data of gathering;
7) step 8 of common mode 1,9,10,11, unique different be that data head first entry of the data file in the step 10 is set at tmp, represent that this data file is interim measuring point data file.
Compare with existing data collection and analysis instrument, the form of the data file in the present embodiment has tangible improvement: in the existing data analyzer data file include only this single part of data volume, the relevant information of data is kept in the another one file, need with special software ability recognition data file, document format data is covert, is unfavorable for sharing of data resource; And in the native system, data file comprises data head and data volume two parts, has increased data head information; Data head is divided into 11, is set to outside the sch (represent that this file is the spot check task data, distinguish mutually with interim measuring point data file) except first, and remaining 10 data item with the spot check task is in full accord, has write down the various Useful Informations of sample; Data volume is a sampling number and a quantity floating number entry of organizing the number product, and each is separator with the line feed.
The frequency of traditional control AD conversion normally mode by software delay realizes that real-time is bad, and the sample frequency of its setting often has certain error, and the result who directly causes is the distortion of signal in frequency.What native system mainly utilized in this link is the specific purpose that has reached accurate setting sample frequency, hard real-time of hardware itself.AD conversion unlatching in the native system is to realize by the modulating pulse that produces with the PWM timer that S3C2410X itself provides.The frequency of modulating pulse promptly is the sample frequency of setting, and after opening the PWM timer, its operation is not influenced by operating system environment, can produce modulating pulse accurately.
As shown in Figure 9, after system powers on, processor initiating hardware resource, operation LINUX operating system, initiating hardware equipment mainly is meant SPI equipment (set up and single chip communication, single chip computer AT 89S52 works as the hardware device of LINUX operating system) and AD equipment; And, enter patterned user interface by the script startup master routine.Wait for user's input.When carrying out the spot check task, master routine transmits parameter (sample frequency) for earlier SPI equipment and transmits parameter (sampling number and sample frequency) for AD equipment, starts the AD conversion then, carries out data acquisition.After data acquisition is finished, the data form in accordance with regulations that the collects form with file is saved in the SD card, simultaneously,, close the power supply of correlation module by sending instruction to single-chip microcomputer, save electric energy with maximization, prolong the working time of instrument.
The embedded graphic application program of installing on this embedded system adopts the hierarchy of graphical interfaces application layer and hardware driving layer and designs, and graphical interfaces has portability, and is irrelevant with hardware layer, for the user provides one good graphical interfaces is arranged; And Drive Layer is as the module of LINUX kernel and dynamic load, application layer and and concrete hardware between, provide the application programming interfaces of a unanimity for the detail of application layer shielding hardware and for it.(software architecture is seen accompanying drawing 9)
The user interface of traditional data collection and analysis instrument is often fairly simple, function singleness, and neither one is complete, friendly, powerful graphic user interface.
Functions such as the data acquisition of this software collection, data analysis, data management and data communication are one, the parameter setting, data acquisition, data storage, data transmission, the time-frequency domain analysis of data, the management of data, the reception of spot check task of finishing the vibrating data collection task under close friend's graphic user interface function such as communicate by letter with the setting of management, systematic parameter and with host computer.Powerful, easy to use.
Native system mainly contains six big modules to be formed, and is respectively data acquisition module, and system is provided with module, data analysis module, and the task management module, data derive module, and serial communication modular.
The data acquisition module major function is that interim measuring point is carried out data acquisition, and with the data storage of gathering, wherein mainly comprises the setting of various parameters, as channel selecting, sampling number, the isoparametric setting of sample frequency.
System is provided with the setting that module comprises system time, the adjustment that LCD is backlight etc.
Data analysis module comprises the management of data and the analytic function two big functions of data.In data management function, can briefly check information such as the situation that is provided with, deleted data file of the path of measuring point, various acquisition parameters etc.And in the data analysis function, provide the instrument that the data of measuring point is carried out various time frequency analysis, make things convenient for the spot check personnel to make the equipment fault diagnosis of suggestion at the scene.
Task management module major function is an existing spot check task in the management data collection analyser.The spot check personnel can check the information of the measuring point of spot check task, the task executions time of regulation, the various parameters that are provided with in the task easily by this module.After the selected task, can carry out corresponding task and carry out data acquisition and storage.
It is that derived data is to USB flash disk that data derive the module major function.
Serial communication modular is mainly realized two functions: receive the spot check task that host computer is assigned; Data files all in the analyser is uploaded in the database of host computer.

Claims (4)

1. portable vibration data collector based on embedded technology, include the acceleration transducer that connects successively, acceleration transducer interface module (1), electric capacity isolation module (2), program control amplification module (3), self-adaptation frequency overlapped-resistable filter (4) and AD conversion and bus interface (5) thereof, it is characterized in that: also include ARM minimum system (7), DIM144 interface module (6), single-chip microcomputer (8) and the electronic module tag (9) that is connected with single-chip microcomputer (8), keyboard (10), power management and voltage transformation module (11), described program control amplification module (3) also links to each other with single-chip microcomputer (8) with self-adaptation frequency overlapped-resistable filter (4); Wherein:
Described acceleration transducer is used for gathering the acceleration signal of target device vibration, and exports with the form of voltage;
Described acceleration transducer interface module (1) is used for providing the voltage and the constant current source of excitation to acceleration transducer;
The communication interface (12) of ARM minimum system (7) and LCD and touch screen interface (13) are drawn by DIM144 interface module (6);
ARM minimum system (7) links to each other with host computer by communication interface (12), be connected with single-chip microcomputer (8) by spi bus, ARM minimum system (7) is downloaded the spot check task from host computer, and sending the sample frequency in the spot check task to single-chip microcomputer (8), single-chip microcomputer (8) is 1/2nd of sample frequency by the low pass of selecting different resistor networks to set self-adaptation frequency overlapped-resistable filter (4) by frequency;
AD conversion and bus interface (5) thereof link to each other with ARM minimum system (7) by DIM144 interface module (6), and described AD conversion and interface module (5) thereof are that simulating signal is carried out sending ARM minimum system (7) to after the AD conversion according to the sample frequency of setting; The setting of the sample frequency of AD conversion is to control by the modulating pulse of the hardware PWM timer generation of ARM minimum system;
Described electronic module tag (9) is that the interface by unibus reads the information in the device power subtab imformosome in the single-chip microcomputer (8);
Described keyboard interface is meant the keyboard by the expansion of single-chip microcomputer (8) port; By the single-chip microcomputer scanning encoding and coding is sent to the keyboard driver of ARM minimum system;
Described power management and voltage transformation module (11), when the external world is a lithium cell charging during for DC, also the voltage transitions that lithium battery is exported becomes the multi-channel analog power supply that system needs, digital power and insulating power supply, and finish the control that enables of each road power supply in conjunction with single-chip microcomputer (8), control acceleration transducer interface module (1), electric capacity isolation module (2), program control amplification module (3), the unlatching of the power supply of self-adaptation frequency overlapped-resistable filter (4) and AD conversion and bus interface (5) thereof, close, do not carrying out under the situation of data acquisition, system is with its power remove;
LCD and touch screen interface thereof (13) link to each other with ARM minimum system (7) by DIM144 interface (6), finish the demonstration and the input of graphical interfaces.
2. a kind of portable vibration data collector based on embedded technology according to claim 1 is characterized in that: described LCD is the LCD of 3.5 inches screens, 320 * 240 resolution, 65536 looks.
3. a kind of portable vibration data collector based on embedded technology according to claim 1 is characterized in that: described communication interface (12) includes USB, SD and serial ports.
4. portable vibration collecting method based on embedded technology is characterized in that this method realizes according to the following steps:
1) ARM minimum system (7) is downloaded the spot check task by the serial line interface in the communication interface (12) from host computer, and the spot check task is saved on the SD card by the SD card in the communication interface (12);
Described spot check task is a text, comprises 10 entries, thes contents are as follows:
Task time;
Mission number;
The path of measuring point;
The ID of electronic tag number;
The sample frequency of setting;
The sample length of sampling;
The data type of measuring point;
The direction of measuring point comprises horizontal measuring point and vertical measuring point;
The group number of the sample of gathering;
Interval time between group;
2) ARM minimum system (7) is resolved the spot check task, and the frequency that the parameter of the hardware timer by setting ARM minimum system (7) is set the AD conversion is a sample frequency, and the SPI agreement sends to single-chip microcomputer (8) with sample frequency simultaneously;
3) single-chip microcomputer (8) is set at 1/2 of sample frequency by selecting different resistor networks with the low-pass cut-off frequencies of self-adaptation frequency overlapped-resistable filter (4) according to the sample frequency that receives;
4) consistance of checking measuring point and spot check task;
Described verification method is: by electronic tag interface (9) coding that the electronic labeling information on the equipment writes down body is read in single-chip microcomputer (8), single-chip microcomputer (8) is issued ARM minimum system (7) with this coding, ARM minimum system (7) is compared this coding with ID number of electronic tag in the spot check task, the identical task of then representing is corresponding with measuring point, can execute the task;
5) behind the affirmation measuring point, sensor is installed to appointed positions;
6) carry out the spot check task: ARM minimum system (7) sends start command of acquisition to single-chip microcomputer (8), and single-chip microcomputer (8) is opened the power supply of corresponding module, and ARM minimum system (7) starts the AD conversion, the beginning data acquisition;
7) after the simulating signal of the measuring point that collects of acceleration transducer is passed through electric capacity isolation module (2), amplification filtering module (3), self-adaptation frequency overlapped-resistable filter (4) successively, carry out the AD conversion;
8) data that are converted to of AD are kept in the internal memory of ARM minimum system (7), and data-switching are become the floating number of corresponding acceleration; Simultaneously, the ARM minimum system stops acquisition instructions for single-chip microcomputer (8) transmission, and single-chip microcomputer (8) receives the power supply of instruction back closing module (1) to module (5);
9) data analysis: the data that collect are analyzed by the data analysis software in the ARM minimum system (7), and the result that will analyze is presented on the LCD in the mode of figure;
10) data storage: on the SD card that AD data converted result is carried to equipment by core dump with the predetermined data document form;
The form of described data file is as follows:
Data file comprises data head and data volume two parts; Data head is divided into 11, is set to sch except first, represents that this file is the spot check task data, and remaining 10 data item with the spot check task is in full accord; Data volume is a sampling number and a quantity floating number entry of organizing the number product, and each is separator with the line feed;
11) data derive: to USB flash disk, perhaps the SD card is unloaded the host computer sense data by the USB interface derived data in the communication interface (12) of system, perhaps reclaim the software data collection by serial communication by the host computer data.
CNB2008100556290A 2008-01-04 2008-01-04 A kind of portable vibration data collector and method based on embedded technology CN100573378C (en)

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