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1、英文原文Auto-testing system for fan performance basedon virtual instrumentation technologyAbstract: In accordance with the present status of measurement of fan performance with burdensome in labors, low inaccuracy and backward in testing method, auto-testing system for fan performance based on Virtual I
2、nstruments(VI)technology was developed. The system integrated sensor technology, computer technology and measurement technology.As a result, the system can not only automatically acquire, process testing data and express the final results in suitable forms but also control and adjust different worki
3、ng loads. The whole system is friendly in interface, easy in operation and complete in functions. The experiment results showed that the stability of the experiment process increased, the reading error was avoided and the measurement accuracy and experiment efficiency were improved. The system has b
4、een widely applied to many fan production factories and research institutes. Key words: fan; performance testing; auto-testing; virtual instrumentation; data processing1 Introduction The parameters of fan: flux, pressure, power an deficiency not only decide working performance but also are the basis
5、 of selecting and using blower for people. Because of the blower theory being not perfect, performance testing is the main method of acquiring these parameters. Moreover, the testing is important for testing products and designing new products. In China, traditional fan performance testing is always
6、 done manually or by single chip which has many shortages including lower precision, heavy labor intensity, unfriendly user-interface, and so on. Therefore, according to the demands of modern times experiment technique, an automatic test and analysis system for fan performance based on virtual instr
7、umentation tool Lab Windows/CVI was designed in this paper. Combined sensor technology, computer technology and testing technique, the virtual instrumentation (VI) technology makes the most use of intelligence of computer to thoroughly break down the mode that the traditional instruments are defined
8、 by the manufacturers, however the users can not change. With VI, users are provided a space to exert their capacity and imagination adequately. It is the user, not the manufacturer, who can design their own. instrument system at their pleasure according to personal need. In the virtual instrument s
9、ystem, the hardware only provides a solution to the input and output of signals, however the software is the key to the whole system. Any user may modify the software to change, increase or decrease the functions and scales of the instrument system. As a result, the system can not only automatically
10、 acquire, process testing data and express the final results in suitable forms but also control and adjust different working loads. The whole system is friendly in interface, easy in operation and complete in functions. The experiment results have shown that the stability of the experiment process h
11、as increased, the reading error was avoided and the measurement accuracy and experiment efficiency were improved. The system has been widely applied to many fan production factories and research institutes.2 Hardware design of the system Hardware of this system, which is the basis of signal acquisit
12、ion, conversion, enhance and processing, consists of fan, motors, wind pipe, sensors, computer, data acquisition board, frequency conversion governor, etc. The block diagram of system structure is shown in Fig.1. Among those components, computer and plug-in DAQ board play an important role in the sy
13、stem. With the high performance DAQ board, not only data acquisition, A/D conversion but also frequency control, step motor control etc are realized. Considered of the technical indexes such as sampling frequency, accuracy, A/D & D/A conversion rate, resolution, the DAQ board PCI-6024E from National
14、 Instruments (U.S.A), with which 200 ks/s, 12-bit performance on 16 single-ended analog inputs can be got up to, is selected. The 6024E features digital triggering capacity, as well as two 24-bit, 20 MHz counter/times; and 8 digital I/O lines. Two 12-bit analog outputs are also featured by the 6024E
15、. The fan parameters: flux, static pressure, torque and rotation speed are measured by corresponding sensors including differential pressure transmitter ( BC69 type, accuracy is FS ), static pressure transmitter (JYB type, accuracy is 1%FS), and torque & rotate speed sensor ( AKC-205 type, accuracy
16、is 0. 3%FS). The sensor outputs are all standard current signal with 420 mA. To meet the DAQ board input signal type and range, 0 5 V voltage signals are achieved from 420 mA current signals by an interface board which is used for signal transformation. Through the analog output channel on 6024E, 05 V voltage signal which is corresponding on 050 Hz of AC frequency, are sent out to control frequency converter (FR-A540-1.5K-CH type, MITSUDISHI,
