CC BY
24
иркутский государственный университет путей сообщения
magnetic-assisted oxidation system. Curve 3 (reaction time was 30min) solid line denotes the ultraviolet visible spectrum of sample which is oxidized by only oxidation system. The two ultraviolet visible spectrums are extremely approximate (reaction time is obviously different, dashed line is add-on shows difference). From Fig5 we can see that the productivity of 'OH under sur-magnetic field was the same to no sur-magnetic field. It shows that the sur-magnetic field did not enhance the productivity of 'OH.
4.2. Conclusions.
1. When 500mL simulative wastewater, pH value is 10, the density of aerated ozone is 1.167mg,L"1,h"1, the intensity of magnetic field is 374.1mT, the removal rate of chromaticity achieved 97.8% after oxidizing 30min without magnetic field. Comparatively, the removed rate of chromaticity achieved 97.8% after oxidizing 24min under the presence of magnetic field.
2. According to first-order reaction kinetics, the relation between y and A is fit in first-order kinetics equation under the magnetic field condition, the obtained correlation coefficient of
linear equation above 0.99. It shows that the response fits in first-order kinetics, the kinetics equation is y = 0.19246A.
3. The sur-magnetic field enhanced 'OH productive rate of micro-O3/OH- system, but has not enhanced its productivity.
BIBLIOGRAPHY
1. Zheng Jilu, Fan Juan, Ruan Fuchang. Techniques and equipment for environmental pollution control, 2000, 1 (5): PP.29-35.
2. Zheng Yunzhong. the measurement of the ozone density, synthesize the material aging and applied 1990,000 (002): PP.37-41
3. Jiang Huanwei, Wang Yu , Li Fengkai et al.
Journal of East China University of Science and Technology (natural science version), 2003, 29 (2): PP.166-169.
4. WangGuoquan, WuZhongyun, magnetic chemistry and medicine. BeiJing: Weapon Industry Press1997, PP.21-23.
Yang Feng-ping , Zhang Bi-wu,
FengChun-hua YAK 621.311
MECHANICAL PROPERTIES MEASUREMENT AND SOFTWARE DESIGN OF VACUUM CIRCUIT BREAKER
1. Introduction.
With the rapid development of railway electrification transformation the vacuum circuit breaker which possess a lot of advantages such as high current interrupting capabilities, long life, safety, reliability, small noise, working under bad environment and operating frequently, has been used widely in the railway system'11. As the main switch of electric locomotive, the reliability of vacuum circuit breaker is directly related to the reliable movement of electric locomotive. It needs inspecting, adjusting and maintaining frequently in the operation. So it has the extremely vital practical significance to strengthen the examination and diagnosis of vacuum circuit breaker.
But existing measuring devices have many defects. The measuring devices in China have many problems such as small applicable scope, inaccurate test data and inferior antijamming ability, bad human-computer interaction, and poor ability to storage, inquiry the result. The imported measuring device (PROGRAMMA Company TM1600/MA61) has good performance, but it has high price and it is inconvenient for Chinese to use English operation surface. Furthermore, the software function of measuring device is simple, it is extremely inconvenient to query and search the mass data, and it can not meet the needs of the circuit breaker measuring nowdays. So in order to solve these problems, a high precision,
МЕХАНИКА. ТРАНСПОРТ. МАШИНОСТРОЕНИЕ
©
Fig. 1. Appearance of vacuum circuit breaker.
intellectualized, networked vacuum circuit breaker tester for vacuum circuit breaker should be designed and realized to meet the requirements of increasing reliability and safety in railway. The device provides the intelligent terminal for the railway informational management and can meet the needs of circuit breaker measuring.
Fig.1 is Vacuum Circuit Breaker's appearance and its position on electric locomotive(between A and B).
2. The Device Hardware Design.
Using Embedded technical grade mainboard EC3J-1547CLDNA(B) as the system core, combined with storage device DiskOnChip 2000, touch screen, sensor and micro-printer, the hardware platform of microcomputer system for test and control is constructed. Platform control and process ability enhances largely compared to which has taken the Single-Chip Microcomputer as the system core. Touch screen and miniature printer enables this instrument to have the excellent human-computer interaction.
The embedded mainboard which integrates CPU, SDRAM and so on is the core of Hardware platform, responsible for the control of the test and data processing. As storage device, DOC 2000 stores embedded Linux operating
system which is reduced according to the system actual demands, operation control interface programme and
examination data. As
input device, the touch screen with operation control interface is responsible for receiving the user instructions. Simultaneously as output device, the touch screen is also responsible for the displaying of human-machine interface during the entire examination process. The miniature printer will print the examination parameters and results. The network function realizes uploading the examination result to the upper data center. The IDE equipment may be the host hard disk or the DOM equipment, which is mainly used to copy the entire software system from the host to the target machine in the developing period. The mouse and keyboard is also used in the debugging period.
Fig.2 is the device's hardware sketch .
3. The Device Software Design and Realization.
The device's software functions mainly depend on embedded Linux system, MiniGUI and MySQL database. The software realizes as follows: Regarded the PC which has installed Red Hat Linux 9.0 as the host machine, Embedded Linux operation system is constructed by cutting down from standard Linux-2.4.18 kernel, constructing subminiature root file system and seting GRUB etc. Then MiniGUI running environment is disposed and MiniGUI software package is installed in host machine. Then MiniGUI is used to write the graceful control interface which has a good performance in human-computer interaction. After that MySQL database is installed in host machine, MySQL is used to write program which realizes test result's storage and inquiry. The test result can be transferred to data center by program. It is
Disk On Chip 2000
Miniature Printer USB Devise
— ■-tt —-- —tt—
Parallel Interface USB Interface
m
DOC Interface
Power J* Power Interface
Mouse PS/2 Interface
I Keyboard
Integrates NS GX1 300MHz CPU Integrates NS CS5530A Clupset Integrates 64MB SDRAM and so on
VGA Interface
Touch Screen
■
Network Interface ■ ■ Network
■
IDE Inter fee e : Г i Сд IDE ■ i
( Embedded Mainboard )
Fig. 2. Sketch map of the measuring device's hardware.
ИРКУТСКИМ государственный университет путей сообщения
convenient to inquire and analyse data in the future. The designing process will be introduced in details in the following.
3.1 Construct Embedded Linux OS.
This device's operating system is constructed with embedded Linux. Constructing a miniature embedded Linux operating system can be divided into three parts approximately: cutting down Linux kernel, constructing subminiature root file system and seting GRUB[2].
According to the system actual demands, some unnecessary function modules have been deleted. Thus it not only reduces the system kernel length, but also reduces system resources which these modules occupy. Simultaneously some function modules are created to support to the storage device DOC 2000 and graphics engine FrameBuffer and so on.
GRUB is chosen as system bootloader for this device. The GRUB decides which kernel should be started according to the configuration files .The configuration files menu.lst can be read by GRUB in the root file system directory /boot/grub/ when the syetem is starting[3]. This system equips the corresponding configuration files according to the system hardware.
3.2. Graphics User Interface.
3.2.1. MiniGUI Introduction.
MiniGUI, developed by Beijing Feynman Software Technology Co. Ltd.,originates from a world famous free software project which is initiated by WeiYongming. MiniGUI aims to
provide a fast, stable and lightweight graphics user interface (GUI) support system for real-time embedded systems.MiniGUI has been widely used in handheld terminals (mobile phones and PDAs), set top boxes, industry control systems, industry instruments, portable media players, and so on. Nine years have passed since MiniGUI was launched at the end of 1998, MiniGUI has become the de-facto standard in the field of embedded graphics middleware [4~6].
3.2.2. Design of the Device Function Based on MiniGUI.
Adopting the event triggering mechanism, this device's application software is mainly composed of following modules: system administration module, system entry module, user administration module, parameter load module, record inquiry module, record print module, graphical display module, network transmission module, movement test module and so on. The device's function structure is showed in Figure 3.
Fig. 4 is the corresponding main interface of vacuum circuit breaker.
On the main operating interface of measuring device, users can realize the module function by clicking corresponding buttons on the control panel. The user management module may manage the system user names and passwords, setting normal value of the circuit breaker's parameters. By clicking corresponding buttons in the user administration module, user
Fig. 3. Frame of the measuring device's function.
МЕХАНИКА. ТРАНСПОРТ. МАШИНОСТРОЕНИЕ
LMJ ОО Об
1
Fig. 4. Main interface of vacuum circuit breaker.
can be increased and decreased, and user passwords can also be changed or set. In order to manage safely, this module has the user authentication function. Only the administrator has the manage privilege. The parameter load module is mainly responsible for inputting the tester name, the vehicles type and the circuit breaker number and so on. After the setting finished, the user can click the save button, the system receives various parameters and displaying on screen immediately.
The historic record module is mainly responsible for inquiring the record in the database. The system provides five inquiry ways including inquiry by the start-end time, the tester number and the circuit breaker number and so on. The system searches the MySQL database according to the inquiry way. It creates the list of the records satisfying the inquiry condition.The user can query and delete the selected record. Figure 5 is the record inquiry module flow chart.
Fig. 6 is the corresponding record inquiry interface.
The system can display the data by graph in the graphical display module. It is convenient for user to analyze and process the data. It can upload the record result to the data center through the network transmission module. This device can also preserve and print the result freely. These functions are not only convenient for user to understand circuit breaker active status, but also useful for maintenance man to repair the vacuum circuit breaker.
3.3 Realization of Data Process Module Based on MySQL.
The MySQL database is a client/server system that consists of a multi-threaded SQL server that supports different backends, several different client programs and libraries, administrative tools, and a wide range of application programming interfaces(APIs)[7].It has become the world's most popular open source database because of its consistent fast performance, high reliability and ease of use. This system manages the device's data with MySQL database. The device manages MySQL database
Fig. 5. Flow chart of record inquiry module.
иркутский государственный университет путей сообщения
Fig. 6. Record inquiry interface
in graph through MySQL C API based on MiniGUI181. This method which primely meets the system needs is convenient for user to manage and maintain the MySQL database.
There are six steps to realize the database function using the MySQL API
(1) Using mysql_init(&mysql) function to establish the MySQL object and its initialization
(2) Using mysql_real_connect() function connect server.The mysql_real_connect() function prototype isJemysql_real_connect (MYSQL *mysql, const char *host, const char *user, const char *passwd, const char *db, unsigned int port, const char *unix_socket, unsigned long client_flag), it include host name, user name, password, database name and so on.
(3) lock the database
(4) request to the MySQL database server by mysql_query()
(5) unlock the database
(6) Using mysql_close() function to close the database
Fig. 7 is the UML activity graph of operating MySQL by MySQL C API. 4. Conclusion.
The tendency of embedded development is using the latest embedded technical in the industry product which has outstanding man-machine interface. This system combines MySQL with MiniGUI under Linux operating system, realizing a high precision, intellectualized, networked vacuum circuit breaker tester. The device has lots of advantages such as small volume, high reliability, low cost of hardware resources, free of software, good human-machine interface, simple operation. So it has high practical value.
BIBLIOGRAPHY
YANG Xiao-jun; QU Xing-hua; CHENYong . Natural Parameter Measurement of Circuit Breaker and Software Design [J]. Chinese Journal of Sensors and Actuators,2006(3) Karim Yagbmour [M]. Building Embedded Linux Systems , O'Reilly , 2004(12). WANG Xue-long.The Design and Application of Embedded Linux System[M] Tsinghua University Press,2001(8). Beijing Feynman Software Technology Co., Ltd. MiniGUI Tech White Paper[M]. 2003(10).
Beijing Feynman Software Technology Co., Ltd. MiniGUI Programming Guide [M]. 2003(10).
Jaclik A, Kolenko T, Zupancic B. A graphical user interface of a 3D simulation Model for a steel-billet reheating process in a walking-beam furnace. IEEE.2003,1:469-473. George Reese,Randy Jay Yarger Tim King,HugbE.Williams. Managing & Using MySQL second edition [M]. O'Reilly, 2003(5).
QIU Shui. Convenient to Manage MySQL in Graph. Open Source World.2004(3).
Fig. 7. Activity graph of operating MySQL based on MiniGUI.
