In the era of computer and network, the transformation of traditional industries by computer and network technology is the trend of the times. The virtual instrument system is the product of the fusion of computer and network technology and traditional instrument technology. Virtual Instrument (VI) is used as the virtual instrument. The current research hotspots in the field of automated instrumentation are getting more and more people's attention. With the continuous development of science and technology, traditional instruments are increasingly exposed to some defects and deficiencies. In order to improve experimental conditions, reduce experimental costs, and update experimental content, it has become an inevitable trend to introduce virtual instruments into experimental teaching. The application of virtual instruments to college experimental teaching is still in its infancy, but its remarkable economic and practicality has shown its great advantages and potential. In recent years, due to the rapid development of virtual instrumentation and network technology, it has become possible to build virtual laboratories through the network. It is not far from the distance education learners to conduct remote experiments through the network. With the emergence and development of virtual instruments, it will bring about the emergence of new experimental methods and promote a major shift in educational methods.
The use of virtual instrument technology to develop virtual oscilloscopes is a research topic that engineers and technicians in various fields have been engaged in. The content involved is generally based on a physical oscilloscope. The virtual oscilloscope with the same interface and function as the physical oscilloscope is developed through programming. Instead of a traditional oscilloscope. Instead of using an oscilloscope or a fluorescent screen to display waveforms, a virtual oscilloscope uses a powerful microcomputer to complete signal processing and waveform display. Using software technology to design a convenient and realistic instrument panel on the screen, various kinds of Signal processing, processing and analysis, using a variety of different methods (such as data, graphics, charts, etc.) to represent the measurement results, to complete measurement tasks of all sizes.
At present, the servo control system has been widely used not only in industrial and agricultural production and daily life, but also in many high-tech fields such as laser processing, robots, CNC machine tools, large-scale integrated circuit manufacturing, office automation equipment, satellite attitude control, Applications in radar and various military weapon tracking systems, flexible manufacturing systems, and automated production lines are also rapidly evolving. The AC servo motor is the most frequently used motor in marine equipment, and it is also a motor with a high failure rate. A slight change in parameters will cause the system to shake, which seriously affects navigation safety. Performance testing is of great significance for improving the maintenance support capability of marine navigation equipment. Speed ​​is an important performance parameter.
1. System composition and signal flowThe speed test system designed in this paper mainly includes the following parts: industrial computer, data acquisition card PCI-6251, drive amplification unit and infrared pair tube. The block diagram of the control system is shown in Figure 1:
Figure 1 control system composition block diagram
The servo motor (excitation voltage U3, control voltage U4) test signal flow includes 5 parts:
(1) The industrial computer outputs two strictly in-phase AC signals U1 and U2 through the AO0 and AO1 (analog output) of the data acquisition card PCI-6251;
(2) U1, U2 are driven to amplify the unit for voltage and power amplification to U3, U4;
(3) U3 and U4 are respectively connected to the excitation end and the control end of the AC servo motor, and the motor starts to rotate;
(4) The rotation of the motor drives the self-made gear disc connected to the shaft to rotate, and the teeth on the gear disc are intermittently blocked between the emitter of the infrared pair tube (5) and the receiver of the triode, so that the triode output pulse signal;
(5) The pulse signal is transmitted to the AI ​​(analog input) of the data acquisition card PCI-6251, and is displayed on the industrial computer in a waveform manner, and the rotational speed of the AC servo motor is obtained through the program.
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