發(fā)布時間：2018-06-15 00:21

  本文選題：氧氣監(jiān)控器自動化測試平臺 + 有線通信系統(tǒng)�。� 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：機載氧氣監(jiān)控器是調(diào)節(jié)和監(jiān)控飛行員呼吸供給的機載設(shè)備,其運行狀態(tài)關(guān)系著飛行員的生理安全。因此,在使用之前或者定期都需要對氧氣監(jiān)控器進行完備的功能與性能測試,保證其可靠性。針對某型機載氧氣監(jiān)控器所設(shè)計的自動化測試系統(tǒng)可對其各項功能與性能進行正確性和可靠性測試,且測試過程實現(xiàn)全自動化,并能夠?qū)崟r顯示測試數(shù)據(jù)和生成測試報表。由于該型氧氣監(jiān)控器的測試與調(diào)試工作主要依賴于與此電子設(shè)備的串口通信,并且相應(yīng)的自動化測試系統(tǒng)內(nèi)部含有多個需要通信的傳感器和儀表。為實現(xiàn)對該電子設(shè)備不僅能夠進行較遠距離的現(xiàn)場單機通信,且能夠滿足相應(yīng)自動化測試系統(tǒng)中的多機組網(wǎng)通信。本文通過研究當下一些基于單信號線的總線接口技術(shù),設(shè)計并改進了一套適合應(yīng)用環(huán)境的新型單總線接口方案。該通信接口方案采用單信號線主從式結(jié)構(gòu),并設(shè)計了相應(yīng)的主機接口電路和從機接口電路。其中,從機接口電路采用低功耗設(shè)計,屬于無源接口,結(jié)構(gòu)簡單,成本低廉;主機接口電路采用收發(fā)雙驅(qū)動雙電壓設(shè)計,其中發(fā)送電路采用功率MOS管驅(qū)動、三態(tài)輸出,接收電路采用模數(shù)轉(zhuǎn)換、分壓接收,另外還設(shè)置了相應(yīng)的保護電路。在對傳輸線建模后,再對整個通信網(wǎng)絡(luò)進行電路仿真測試。實驗結(jié)果表明,當傳輸介質(zhì)選擇在5號雙絞線條件下,新型總線的通信距離可達2000m,傳輸速率可達38400bit/s,可驅(qū)動從機節(jié)點數(shù)多達450個。最后利用該通信接口設(shè)計了一個便攜的通信校準模塊,并應(yīng)用到氧氣監(jiān)控器自動化測試平臺當中。從而擴展了對此型氧氣監(jiān)控器的調(diào)試方法。硬件上對氧氣監(jiān)控器的通信設(shè)計采用本文所述接口;軟件上基于MSP430單片機設(shè)計了相應(yīng)的協(xié)議處理程序和校準調(diào)試程序;最后通過PL2303芯片實現(xiàn)了MSP430單片機串口到USB 口的轉(zhuǎn)換。實現(xiàn)完成后,通過該模塊,氧氣監(jiān)控器自動化測試平臺能夠?qū)ρ鯕獗O(jiān)控器進行實時檢測,并可以對其進行自動化的校準調(diào)試。
[Abstract]:The airborne oxygen monitor is an airborne equipment which regulates and monitors the airman's breathing supply, and its running state is related to the pilot's physiological safety. Therefore, it is necessary to test the function and performance of the oxygen monitor before or on a regular basis to ensure its reliability. The automatic test system designed for an airborne oxygen monitor can be used to test the correctness and reliability of its functions and performance, and the testing process can be fully automated, and the test data can be displayed in real time and the test report can be generated. Because the testing and debugging of this type of oxygen monitor mainly depend on the serial communication with the electronic device, and the corresponding automatic test system contains many sensors and instruments that need to communicate. In order to realize the communication of the electronic equipment, it can not only carry out the remote field single machine communication, but also satisfy the multi-unit network communication in the corresponding automatic test system. This paper designs and improves a new kind of single bus interface scheme which is suitable for application environment by studying some bus interface technology based on single signal wire. The communication interface scheme adopts the master-slave structure of single signal line, and the corresponding host interface circuit and slave interface circuit are designed. Among them, the slave interface circuit is designed with low power consumption, which belongs to the passive interface, the structure is simple and the cost is low; the host computer interface circuit adopts the dual voltage design of the transceiver and the transmitter, in which the transmission circuit is driven by the power MOS transistor, and the three-state output is used. The receiving circuit adopts A-D conversion, partial voltage receiving and corresponding protection circuit. After modeling the transmission line, the circuit simulation test of the whole communication network is carried out. The experimental results show that the communication distance of the new bus can reach 2000m, the transmission rate can reach 38400bit / s, and the number of driving slave nodes can reach 450 when the transmission medium is selected under the condition of No. 5 twisted-pair wire. Finally, a portable communication calibration module is designed and applied to the automatic test platform of oxygen monitor. Thus, the debugging method of this type of oxygen monitor is extended. The interface described in this paper is used in the communication design of the oxygen monitor in hardware; the corresponding protocol processing program and calibration debugging program are designed based on MSP430 MCU in software; finally, the conversion from serial port to USB port of MSP430 single chip microcomputer is realized by PL2303 chip. Through this module, the automatic test platform of oxygen monitor can detect the oxygen monitor in real time, and it can be calibrated and debugged automatically.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：V245.31;TN802

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本文編號：2019658