【正文】 disposal circuit, greatly reducing the regulate the number of sub circuit, and improve the accuracy and reliability of the system.According to the above analysis of the monitoring system for monitoring signal and modulation circuit, design of the nursing child son/redundant circuit switching circuit, the event of a failure regulate circuit and redundant circuit switching process is as follows： （14）W (t) is the output of the hysteresis that w (t) is equal to zero, then the system is not stable, because for any x. the simulation, using the generalized RBF neural network for modeling of inverse hysteresis control signal for r = t and the output of the neural network inverse model for v (t), as shown in figure 3, the model by the neural network inverse hysteresis system under the action of single output for 1 w (t), as shown in figure can be seen from the figure 3 and figure 4, greatly weakened, hysteresis andhysteresis phenomenon basically of PID controller is: p = 70 K, K (I) = K d = Bang control rule is: A = , K B = 50, Sp and Sp 1 2 are and figure 5 is not plus Bang Bang control simulation results, namely for the NPID control, figure 6, 7, 8, and Bang Bang control after NBPID control simulation results.4 conclusionHas good characteristics through the use of generalized RBF neural network, direct inverse model of hysteresis system modeling, and then use the inverse model of the implementation of feedforward control, can greatly reduce the hysteresis joining Bang Bang control, can effectively control can be seen from the simulation results, based on feedforward control plus Bang Bang control of PID control, the hysteresis system can be effectively method can also be extended to other types of hysteresis control system.References:[ 1] Hamdan M, Gao Z Q. A novel PID controller fo r pneumat icproportio nal valv es with hyster esis [ J ] . IEEE, 2000, 2:1198 1201.[ 2] Zhao Hongwei, etc. Piezoelectric ceramic actuator in the application of flexible manipulator robot research [J]. Journal of piezoelectric and acoustics, 2000, 22 (3) : 173176.[ 3] Choi G S, Kim H S, Cho i G H. A study on position controlof piezoelectric acuators [ A] . ISIE’ 97 [ C] . Portug al,1997.[ 4] Tao G, Kokotovic P V. Adaptive contr ol of plants w ith unknow n hysteresis [ J] . IEEE Tr ans. Autom. Contr. 1995,40( 2) : 200 212.[ 5] SU C Y, Stepanenko Y, Svoboda J, et al. Robust adaptive contro l of a class of nonlinear systems [ J] . IEEE T ran. . Con. 2000, 45( 12) : 2427 2432.[ 6] Cruz Her nndez J M, Hayward V. Phase control approach to hyster esis reduction [ J] . IEEE Tran. on Contr . . 2001, 9( 1) : 17 26.[ 7] Hwang C L, Jan C, Chen Y H. Piezomechanics using intelli
gent variable structure control [ J] . IEEE Tran. o n Industrial Electo nics. 2001, 48( 1) : 47 59.[ 8] Han J M. T. A. Adriaens. Willem L. de Koning , ReinderBanning. Modeling piezo electric actuators [ J ] . IEEE/ASME Tran. Mech. 2000, 5( 4) : 331 341.[ 9] wang yong ji stuff. Neural network control [M]. Machinery industry press,[ 10] Hay kin S. Neur al Networks[ M] . Prentice Hall I nc. 1999.航空發(fā)動機狀態(tài)監(jiān)測系統(tǒng)設(shè)計研究康文雄、李華聰、楊勇柯( 1. 華南理工大學(xué), 廣東 廣州510640。眾所周知, 發(fā)動機工作過程中的振動大、噪聲高以及其強烈的干擾信號, 都對多種參數(shù)的監(jiān)測系統(tǒng)提出了更高的要求。 數(shù)據(jù)回放方式可以將在飛行試驗中保存的數(shù)據(jù)通過串口通信傳送到上位機, 上位機將接收到的數(shù)據(jù)實時的顯示出來, 其中利用數(shù)字表的形式將數(shù)據(jù)清楚顯示出來, 同時還以模擬表的形式形象的表示出數(shù)據(jù)的變化,除此之外還可以選擇使用以曲線顯示方式將被檢測的狀態(tài)參數(shù)動態(tài)的顯示出來, 最后將所接收的數(shù)據(jù)保存在硬盤中。PC/ 104主機板、PC/ 104 A/ D轉(zhuǎn)換板及 PC/104 數(shù)字光隔 I/O 板實現(xiàn)對發(fā)動機模擬信號量和頻率量的A/D轉(zhuǎn)換和采集, 以及對發(fā)動機數(shù)字信號量的隔離采集,并對采集的信號進行數(shù)據(jù)處理, 存儲和傳輸。4自檢系統(tǒng)及冗余設(shè)計1自檢系統(tǒng)信號調(diào)理系統(tǒng)是一般數(shù)據(jù)采集系統(tǒng)的重要組成部分, 對于數(shù)字信號的調(diào)理不會產(chǎn)生任何問題, 然而在設(shè)計和物理器件的選擇上難以保證模擬通道信號輸入與輸出的絕對相等, 對于模擬信號來說信號調(diào)理系統(tǒng)的誤差將是整個系統(tǒng)誤差的主要來源, 所以采集的數(shù)據(jù)必須考慮這個誤差并進行誤差校正以提高數(shù)據(jù)的準(zhǔn)確性, 顯然, 誤差校正主要是針對模擬通道而言的。2 冗余設(shè)計由于該狀態(tài)監(jiān)測系統(tǒng)所處的環(huán)境極為惡劣, 以及發(fā)動機狀態(tài)監(jiān)測系統(tǒng)的運行時間一般都很長, 因此其信號調(diào)理電路盡量選用高可靠性的元器件, 同時為了防止運行中發(fā)生故障而造成系統(tǒng)部分失效, 還應(yīng)采用冗余電路來提高系統(tǒng)的可靠性和準(zhǔn)確性, 在有的監(jiān)測系統(tǒng)中, 為每一路信號都增加一個相同功能的冗余調(diào)理子電路, 以增加其可靠性。Bang Bang 控制規(guī)律為: A = , K B= 50, Sp 1和Sp 2分別為 和 。通過加入 Bang Bang控制, 可以有效地對誤差進行控制。在該系統(tǒng)中共有 17路模擬量和3 路頻率量, 共分為6 組, 信號分組如表1所示, 其中17路模擬量分為5組, 3 路頻率量單獨為1組, 每組都使用了相同的信號調(diào)理電路進行調(diào)理, 因此, 在該系統(tǒng)的冗余電路設(shè)計中充分利用了這一條件, 每一組信號共用一個冗余調(diào)理子電路, 即每一組使用相同調(diào)理電路的信號在正常運行中分別使用原調(diào)理子電路, 當(dāng)這一組中任何一路信號的調(diào)理子電路發(fā)生故障時, 都可以切換到備用的冗余調(diào)理子電路, 繼續(xù)進行狀態(tài)的監(jiān)測, 從而提高系統(tǒng)的準(zhǔn)確性和可靠性, 由于每組信號共享一個調(diào)理子電路, 因此將原本需要增加 20路冗余信號調(diào)理子電路的調(diào)理電路, 縮減為只需增加 6路冗余信號調(diào)理子電路的調(diào)理電路, 大大減少了調(diào)理子電路的數(shù)目, 并提高系統(tǒng)的準(zhǔn)確性和可靠性。 計算模擬通道的誤差特性。信號調(diào)理電路對信號進行隔離、濾波、放大等處理, 將它們都變換成標(biāo)準(zhǔn)信號, 然后送入下位機。為提高系統(tǒng)的可靠性, 使系統(tǒng)帶有自檢功能和冗余結(jié)構(gòu), 根據(jù)系統(tǒng)的故障情 況給與更換調(diào)理電路或停機。1 .狀態(tài)監(jiān)測系統(tǒng)總體設(shè)計該狀態(tài)監(jiān)測系統(tǒng)是針對某型渦扇發(fā)動機設(shè)計的