基于STM32的数据采集系统英文文献.doc
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1、Design of the Data Acquisition System Based on STM32ABSTRACTEarly detection of failures in machinery equipments is one of the mostimportant concerns to industry。 In order tomonitor effective of rotating machinery, we development a micro-controller uC/OS-II system of signal acquisition system based o
2、n STM32 in this paper。 we have given the whole design scheme of system and the multichannel vibration signal in axis X, Y and Z of the rotary shaft can be acquired rapidly and display in realtime。 Our system has the character of simple structure, low power consumption, miniaturization.Keywords:STM32
3、; data acquisition; embedded system;uC/OSII;1. 1。 IntroductionThe real-time acquisition of vibration in rotating machinery can effectively predict, assess and diagnose equipment operation state, the industry gets vibration data acquisition Rapidly and analysis in real-time can monitor the rotating m
4、achinery state and guarantee the safe running of the equipment。 In order to prevent failure, reduce maintenance time, improve the economic efficiency, The purpose of fault diagnosis system can detect these devices through the vibration signal acquisition of rotating machinery, and process the data a
5、cquisition, then it will make timely judgment of running state of equipment 。While the data acquisition module is the core part of the fault diagnosis system 14。The practical application in the industrial field, is the equipment operating parameters will be acquired to monitor equipment operating st
6、ate。 In traditional data acquisition systems, the data from acquisition card are generally send into the computer, and specific software will be developed for the data acquisition. The main contribution of this paper has designed the STM32 platform with ARM technology, that has become a traditional
7、mainstream technology in embedded systems, and the collecting data toward the direction of high realtime, multi-parameter, high-precision, while data storage become large capacity, more miniaturization and portable, and the development of multicommunication mode and long-distance for data transmissi
8、on。 So as to meet the actual acquisition system multitasking requirements, this article has designed based on STM32 micro-controller uC/OSII system of signal acquisition system。 Therefore, in order to meet the actual acquisition system multitask requirements, this novelty of this article has designe
9、d a signal acquisition system in microcontroller uC/OSII based on STM32。2。Architecture of data acquisition systemData acquisition as key technology for monitoring equipment, recently a lot of work has been done on it. An embedded parallel data acquisition system based on FPGA is Optimized designed w
10、hich will make it reasonable to divide and allocate high-speed and lowspeed A/D 5. Instead, it has use a highspeed A/Dconverter and Stratix II series of FPGA for data collection and processing, in which the main contribution is used of the Compact Peripheral Component Interconnect, the system has th
11、e characters of modularization, sturdiness and scalability 6.But remote control will be needed in Special Conditions, this paper introduce the embedded operating system platform based on Windows CE and uC/OS-II to design a remote acquisition and control system with the GPRS wireless technology 7-8.I
12、n order to achieve the data sharing of multiuser, it has build the embedded dynamic website for data acquisition management and dissemination with the ARM9 and Linux operation system 9.A data collection terminal devices is designed based on ARM7 microprocessor LPC2290 and embedded realtime operating
13、 system uC/OSII to solve the realtime acquisition of multichannel small signal and multi-channel transmission10.On the other hands, two parallel DSPbased system dedicated to the data acquisition on rotating machines, and the inner signal conditioner is used to adapt the sensor output to the input ra
14、nge of the acquisition, and then signal postprocessing by the design software, while the most frequently structure is to use DAS and FPGAbased, and such programs are also dependent on the DAS cost.In order to meet market requirements of low power consumption, low cost, and mobility, Fig.1 in this pa
15、per presents the design overall structure diagram of data acquisition system。 Through SPI interface, the system gets the data collection with three axis acceleration sensor into the STM32 controller of inner A/D conversion module with 12-bit, this process is non-interfering parallel acquisition。 Our
16、 system uses 240x400 LCD and touch screen module realtime to display the collected data in real time。2。1。 STM32 micro-controllerA 32 bit RISC STM32F103VET6, used as the processor in our system, compared with similar products, the STM32F103VET6 work at 72MHZ, with characters of strong performance and
17、 low power consumption, real-time and lowcost. The processor includes: 512K FLASH, 64K SRAM, and it will communicate by using five serial ports which contain a CAN bus, a USB2。0 SLAVE mode and a Ethernet interface, what s more two RS232 ports are also included。 The system in our paper extend the SST
18、25VF016B serial memory through the SPI bus interface, that will regard as the temporary storage when collect large number of data, furthermore, we have the A/D converter with 12 bits resolution, and the fastest conversion up to 1us, with 3。6 V fullscale of the system。 In addition to design of the sy
19、stem power supply circuit, the reset circuit, RTC circuit and GPIO port to assurance system needs and normal operation。2.2. Data acquisitionThe machine state is normal or not is mainly depended on the vibration signal。 In this paper, to acquire the vibration data of rotating machinery rotor, we have
20、 used vibration acceleration transducers MMA7455L which could collect the data from axis x, y, and z of the company of Freescale. The kind of vibration acceleration transducers has advantage of low cost and small size, high sensitivity and large dynamic range with small interference。 MMA7455L is mai
21、nly consists of gravity sensing unit and signal conditioning circuit composition, and this sensor will amplify the tiny data before signal preprocessing。 In data acquisition process of our system, the error of sampling stage is mainly caused by quantified, and the error is depended on the bits of th
22、e A/D converter ,when we regard the maximum voltage as V max , the AD converter bits is n, and the quantization Q = V max/2n, then, the quantization error is obeyed uniform distribution in q / 2, q / 2 13.The designed STM32 could built at most three 12bit parallel ADC in this paper , which theoretic
23、al index is 72dB and the actual dynamic range is between 54 to 60dB while 2 or 3 bits is impacted by noise, the dynamic range of measurement can up to 1000 times with 60dB。 For the vast majority of the vibration signal, the maximum sampling rate of 10kHZ can meet actual demand, and the higher freque
24、ncy of collection is generally used in the 812 bits AD, therefore one of contribution of this work is to choose a builtin 12-bit A/D to meet the accuracy of vibration signal acquisition and lower cost in this experiment。3.Software design3。1。 Transplantation of C/OSIn order to ensure real-time and sa
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