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External triggering signal conversion filter for wind tunnel experiment acquisition system

A technology of acquisition system and signal conversion, applied in the direction of logic circuit connection/interface layout, single-port active network, logic circuit interface device, etc., can solve the problems of inconvenient data acquisition, difficulty in customizing special modules, and small market demand for special equipment. , to achieve the effect of improving flexibility

Inactive Publication Date: 2017-05-31
中国航空工业集团公司哈尔滨空气动力研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems of various system excuses and inconsistent requirements are becoming more and more prominent. The test needs to adjust the signal transmission method according to the different scanning acquisition methods of the acquisition system, especially in the dynamic experiment. Conversion becomes the main issue
[0003] The traditional encoder code disc is a counter method, which brings great inconvenience to the external trigger data acquisition of this control method. The program needs to constantly judge the corresponding relationship between the data and the angle, and needs to be constantly cleared and judged.
External equipment is required on the mechanical structure, which takes up internal space and is not easy to install
[0004] Since the wind tunnel test belongs to the category of special tests, the market demand for special equipment is small, and there is currently no conversion module developed for this type of conversion filter on the market, and it is very difficult to customize special modules due to the production method of electronic circuit modules in the market, which has become The source of demand for this invention design

Method used

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  • External triggering signal conversion filter for wind tunnel experiment acquisition system

Examples

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Comparison scheme
Effect test

Embodiment 1

[0011] An external trigger signal conversion filter for wind tunnel test acquisition system, including optocoupler code disc signal generator, four differential line drivers 26LS31, NOT gates 74LS00 and 74LS01, monostable triggers 74LS121 and 74LS123, optocoupler code The level signal sent by the disk signal generator is output to the four-differential line driver 26LS31, which converts the unipolar signal into a differential signal output, and then connects the two input terminals of the NAND gate 74LS00, and connects the output terminal of the NOT gate 74LS00 to the NOT gate The two input terminals of 74LS01 and the output terminal of the NOT gate 74LS01 output the reverse logic relationship, and then connect with the input terminal of the monostable trigger 74LS121 through the four differential line driver 26LS31, and the negative pulse output terminal of the monostable trigger 74LS121 passes through the non- The gate-and-gate is connected to the negative pulse input end of ...

Embodiment 2

[0013] The optocoupler code disc signal generator uses the code disc to trigger the optocoupler to generate a position pulse signal to provide an external trigger signal for VXI (PXI, HBM). However, the dynamic mode generated by the optocoupler code disc signal generator has high real-time performance and small system delay. Due to the characteristics of the code disc itself, the trigger signal is a level signal, which is less affected by external interference. Converting to a pulse signal is more suitable for data processing and angle calculation. At the same time, it will not be affected by the movement of the motor and meet the dynamic repeatability requirements. The photocoupler has a working current of 20mA and an internal resistance of 510Ω.

[0014] Such as figure 1 As shown, the signal is output through the emitter of the photocoupler (pull-up 2.2K resistor) to the InputA1 pin, InputB7 pin, OuputA2, and OutputB5 of the four-differential line driver 26LS31, and the two...

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Abstract

The present invention provides an external triggering signal conversion filter for wind tunnel experiment acquisition system, which comprises an optocoupler coded disc signal generator, a four differential line driver 26LS31, NOT gate 74LS00 and 74LS01, monostable trigger 74LS121 and 74LS123; level signal sent by the optocoupler coded disc signal generator being output to the four differential line driver 26LS31, and monopole signal being converted into differential wave signal to be output; the negative pulse output end of the monostable trigger 74LS121 connecting with negative pulse input end of the monostable trigger 74LS123 through a NOT gate and an AND gate, and the positive pulse output end of the monostable trigger 74LS123 connecting with the acquisition system. The present invention is able to filter high frequency interference and drive signal, which improves the flexibility of the wind tunnel experiment acquisition system, can be set into different acquisition system.

Description

technical field [0001] The invention relates to an external trigger signal conversion filter used in a wind tunnel test acquisition system. Background technique [0002] As a kind of special test, wind tunnel test has high requirements on the accuracy and real-time performance of the acquisition system. In recent years, with the continuous development of high-speed data acquisition systems, whether it is multi-channel real-time acquisition design, high-precision digital filtering and enhanced anti-interference ability undoubtedly meet the requirements of wind tunnel tests. However, the problems of various system excuses and inconsistent requirements are becoming more and more prominent. The test needs to adjust the signal transmission method according to the different scanning acquisition methods of the acquisition system, especially in the dynamic experiment. Conversion becomes the main problem. [0003] The traditional encoder code disc is a counter method, which brings ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/46H03K19/0175
CPCH03H11/46H03K19/017536
Inventor 明强蒋增龑张旭超何宏伟
Owner 中国航空工业集团公司哈尔滨空气动力研究所