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Procedia Engineering
Procedia Engineering 00 (2011) 000–000 Procedia Engineering 15 (2011) 3911 – 3915 www.elsevier.com/locate/procedia
Advanced in Control Engineering and Information Science
The Design of Vibration Monitoring System Based on PC104 Bus Zhang Yea，Li Wenxingb，a* Xin xiang college Electrical Engineering Department, Xin xiang, He nan, China
Abstract
In practical production, to guarantee the high quality vibration equipment safe operation, abnormal vibration problems of vibration equipment must be detected early. The paper studies the abnormal vibration equipment vibration monitoring technology. It uses PC 104 communication bus in vibration equipment operation condition monitoring on the basis of research vibrating structure of fatigue crack detection technology, and develops the corresponding vibration equipment on-line monitoring system and off-line test system, for maintenance guiding, prevent accidents, prolonging life provides technical support. © 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011] Open access under CC BY-NC-ND license.
Keywords: Vibration monitoring, PC 104 Bus, Online monitoring
Instruction In industrial sectors, whether all kinds of machinery and equipment operation is stable directly affects the efficiency of enterprises, some key equipment and even plays the role of corporate fate. Therefore, how to avoid machine accident, especially catastrophic accident, has always been very great importance to the issue. For a long time, because people can't predict accident and had to take two strategies: the equipment is not maintained until it is broken[1][2]; another is regular examining equipment. Reasonable maintenance methods should be forecasting that the equipment failure appearing in early detect hidden Corresponding author：Zhang Ye Tel:13849374985. E-mail address:
[email protected]
1877-7058 © 2011 Published by Elsevier Ltd. Open access under CC BY-NC-ND license. doi:10.1016/j.proeng.2011.08.732
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trouble and early warning so as to take measures timely and reasonable, hence equipment fault diagnosis arises at the historic moment. In the modern industrial technology, continuous improvement for automation, intelligent, large and complicated degree of equipment, the operation state of equipment for real-time monitoring, and rapid diagnos for appearing fault is very important. Along with the computer software technology advances, virtual instrument is gradually become the development direction of the test area, realizing vibration test and analysis by adopting the virtual instrument has become the development trend of vibration test. It firstly introduces relevant simulation technology theory and principle of fault diagnosis[3], significance and the development present situation. Then according to the research for the development current situation of condition monitoring and fault diagnos at home and abroad, and puts forward the vibration test analysis system composed the necessary sensors, signal disposal device and data acquisition card and to labwindows software produced in NI for development platform. 1. Hardware platform 1.1 sensor selection The sensor of vibration monitoring system is consist of the acceleration sensors, the temperature sensor and pressure sensor , acceleration sensors collect vibration equipment acceleration origina signal which is used to calculate displacement and speed corresponding to vertical, horizontal direction of , so as to provide raw data for subsequent spectral analysis, fault detection; Temperature sensors collect around temperature of vibration equipment, and provide source for morbid alarm; Pressure sensors collect pressure of equipment four corners, and prevent the polarization of the pressure equipment to ensure the stability of equipment center[4][5]. 1.2 A/D circuit Eight roads input A D C 0 8 0 9 as A/D converter chip converted information that the sensor produces about vibration equipment relevant to information into digital signal that the microcontroller can identify. System test and record related parameters of the vibration equipment. At the same time, and must save the information about time to allow users to analyse the data and take corrective measures 1.3 PC104 bus module PC 104 is industrial control bus special for the embedded system, and it is widely popular in recent years in international. It is an embedded control system and a kind of optimization, small stack type structure. Its main features: small size structure, stack type, "pin" and "hole" bus connections, have extremely good vibration resistance. 6mA bus driver, namely can make module normal work, low power consumption, reduce components number, self stack type links, no motherboard. Since it has above characteristic, thus make it be widely used in many areas[6-8]. PC104 technology is a new type of computer test and control platform, it has the following features: under the volume , very compact, modularized design, and tighten the stack of setup, it is suitable for making high density, small volume, portable test equipment, so it is widely used in the aerospace sector and industrial control. Meanwhile, the PC104 is the standards of embedded PC for mechanical and electrical and provides a standard system platform for embedded application. This simulation systems used the SBS embedded PC104 products produced by Sheng Bo technology company. SBS embedded PC104 is completely compatible with IBM - PC , but is different from general purpose commercial
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computer, high quality, high reliability are its first requirements, therefore SBS embedded PC104 products is not shrinking PC. 2. Software design System software design is the core part of this design, software is divided into lower place machine (microprocessor) part and PC parts.
Figure 1 initialization module
Figure 2 data analysis
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3. Communication agreement In vibration monitoring communication system, this paper used the letter format as shown in figure 3 1Byte
1Byte
Letter length
1Byte
Command flag
1~3 Byte
Command parameter
1 Byte
1 Byte
Calibration byte
Figure 3 agreement letter format
FB: for letter head logo. Letters length: letter length equals the length of command identification and the length of command parameter Command parameter: executive order required parameters, the length of this part vary with the command logo. Calibration byte: for letters length, command logo, command parameter each byte, then and 7F facies. FE: letter end logo. Command explanation as shown in figure 4: In all the following command, all numerical are hex unless special instructions . Orders logo 05 said 104 to simulator’s orders: the command parameter 1 for buttons values of control panel, the command parameter 2 for picture number of display frame.
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
03
05
Command parameter 1
Command parameter 2
1 Byte
Figure 4 letters command explain
The first parameter says buttons value, the second parameter said picture number Letters parameters explanation as shown in figure 5 : Order logo 15 said simulators to 104’s command ,that command parameter is decided by the communication data of PC104 simulators received, from 1 to 3 parameters. 1 Byte
1 Byte
1 Byte
Letter length
15
1~3 Byte
Command parameter
1 Byte
Calibration byte
Figure 5 Letters parameters interpretation
1 Byte
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4. Conclusion This paper is given priority to the design of the real-time on-line monitoring vibrating state, through field tests showed that: this system can continuous collect current, vibration and temperature data, ensure in bad environment, can do assessment to run state anytime and anywhere, and eventually ensure that working staff clears vibration sieve operation state so as to provide basis for making maintenance plan and prevent any big risk accident vibrating sieve appear. In addition to the system adopts the daily inspection way to detect it, before the cracks appearing, find the stress concentration area that may cause damage and accidents timely and accurate, remind key monitoring to this area and eventually reduce or eliminate the dangerous of the vibration sieve component that residual stress cause , ensure safety operation and improve the vibrating sieve efficiency and working life.
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