外文翻譯--航空發動機狀態監測系統設計研究(編輯修改稿)

　

【文章內容簡介】 ng tools to simulate the acquisition state parameters of the digital display and the table shows, and draw the time curve so that the observation parameter of the parameters of the dynamic change and trend of the future, which can monitor the working state of the engine at different times, to achieve the purpose of condition monitoring.3. 4 alarm output and print When the collection to the state of the parameter values deviate from normal range after, through the voice warning color to operating personnel, location, and display alarming information, and all the warning point data can be extracted for display, analysis and printing.4 selfchecking system and redundancy design selfchecking system signal disposal system is an important part of general data acquisition system, regulate won39。t create any problems for digital signal, however, on the choice of design and physical ponents is difficult to guarantee the analog channel signal input and output equals the absolute, for analog signal data acquisition system of the main source of error is the system error, so the data must be taken into account the error and error correction to improve the accuracy of the data, apparently, error correction is mainly in view of the analog channel is conditioning part in use after period of time there is a deviation, error characteristics of the analog channel may over time slowly changing, digital channel and analog channel in the system is more, the number of regular manual measurement of the integrity of each channel and channel characteristics is impossible, so a selfchecking system is designed to meet this requirement, the system of selfinspection system consists of two functions: testing the correctness of the regulate channel。Calculation error characteristics of the analog selfchecking system regularly or not regularly by the system automatically or artificial trigger switch schematic diagram.The implementation of the selfchecking process is as follows:(1) Under the PC / 104 a selfinspection program in the machine through the PC / 104 multifunction acquisition boards to K port the selfcheck voltage of 5 V, the system enters the selfcheck state.(2) through the PC / 104 multifunction acquisition boards sent TA and TD ports respectively simulated selfchecking voltage and voltage digital testing.(3) through the PC / 104 A/D conversion board and PC / 104 digital I/O board is introspected the signal acquisition.(4) the selfinspection program to analyze selfchecking signal data to the condition monitoring system39。s environment is very bad, and the running time of the engine condition monitoring system is generally is very long, so the signal disposal circuit selects high reliability of the ponents as far as possible, at the same time in order to prevent failure in the operation of the system part caused by failure, you should also use redundant circuits to improve system reliability and accuracy, and in some cases, monitoring system for each signal all the way to increase a same function of redundancy control circuit, in order to increase its of the monitoring system as part of the airborne equipment, therefore should be on the basis of considering the equipment volume up and improve the reliability of system, the system monitoring data according to the circuit characteristics to consider redundancy control circuit the system of the munist party of China 17 frequency analog and 3 road, which is divided into 6 groups, signals are grouped as shown in table 1, including 17 road analog was divided into 5 groups, 3 road frequency quantity is 1 set alone, each group use the same signal disposal circuit undertake recuperating, therefore, the redundancy of the system circuit design, make full use of the conditions in each group share a redundant signal regulate circuit, namely each group use the same modulation circuit, respectively, using the original control signal in normal operation of circuit, when the set is in any way the signal conditioning circuit failure occurs, can switch to the standby redundancy control circuit, continuing state monitoring, so as to improve the accuracy and reliability of system, due to the signal in each group share a conditioning circuit, and will initially need to increase redundant 20 road son signal disposal circuit module circuit, reduced to simply add redundancy sub circuit for signal disposal circuit, greatly reducing the regulate the number of sub circuit, and improve the accuracy and