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Design of satisfaction output feedback controls for stochastic nonlinear systems under quadratic tracking risk-sensitive index 总被引:5,自引:0,他引:5
In this paper, the design problem of satisfaction output feedback controls for stochastic nonlinear systems in strict feedback form under long-term tracking risk-sensitive index is investigated. The index function adopted here is of quadratic form usually encountered in practice, rather than of quartic one used to beg the essential difficulty on controller design and performance analysis of the closed-loop systems. For any given risk-sensitive parameter and desired index value, by using the integrator backstepping method, an output feedback control is constructively designed so that the closed-loop system is bounded in probability and the risk-sensitive index is upper bounded by the desired value. 相似文献
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针对熔体直纺430 dtex/288 f涤纶预取向丝(POY)含油率不稳定的状况,从上油系统的油嘴型号、油剂泵规格、油剂管道管径等方面分析POY含油率均匀性的影响因素,并提出技术改造措施。结果表明:更换油嘴型号、油剂泵规格对提高POY含油率均匀性的作用不明显,油剂管道管径偏小是POY含油率不匀的关键因素;对油路和丝路进行了改造,将原油剂管道用内径32 mm、外径42 mm的DN32无缝不锈钢管更换为内径40 mm、外径48 mm的DN40无缝不锈钢管,同时在卷绕路径上加装了分丝板和定位瓷件;改造后,生产中断头和毛丝毛圈现象明显减少,POY产品含油率变异系数从8.95%降低至0.98%,条干不匀率从1.27%降低至0.98%,断裂强度变异系数及断裂伸长率变异系数均降低了约1.0%;改造后,丝束上油时喷油、滴油现象得到明显改善,减少了油剂的浪费,每年可节约油剂费用14 235元。 相似文献
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针对熔体直纺涤纶预取向丝(POY)装置生产278 dtex/288 f品种时1#生产线较2#生产线产品优等率低的情况,从设备及工艺两方面对比分析其影响因素,重点探讨1#生产线丝束集束位置对生产及产品质量的影响,并进行相应的技术改进。结果表明:在其他设备和工艺参数相同的前提下,丝束在水平方向集束位置即喷丝板中心点至油嘴集束位置形成的角度不合适是1#生产线产品优等品率低于2#生产线的主要原因;将丝束集束位置形成角由原来的90°调整为85°,生产中断头次数减少56%,降等丝饼量减少83%,产品优等品率由原来的97.27%提升至98.46%,生产稳定;丝束集束位置形成角由90°调整为85°后,生产的278 dtex/288 f涤纶POY的断裂强度变异系数、断裂伸长率变异系数、条干不匀率、含油率变异系数均有较大幅度的降低,降幅分别为18.7%、20.1%、8.8%、51.7%,产品质量更加均匀稳定。 相似文献
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Output feedback stabilization for stochastic nonlinear systems in observer canonical form with stable zero-dynamics 总被引:6,自引:0,他引:6
In this paper, we study the problem of output feedback stabilization for stochastic nonlin-ear systems. We consider a class of stochastic nonlinear systems in observer canonical form with sta-ble zero-dynamics. We introduce a sequence of state transformations that transform the system into a lower triangular structure that is amenable for integrator backstepping design. Then we design the out-put-feedback controller and prove that the closed-loop system is bounded in probability. Furthermore, when the disturbance vector field vanishes at the origin, the closed-loop system is asymptotically stable in the large. With special care, the controller preserves the equilibrium of the nonlinear system. An ex-ample is included to illustrate the theoretical findings. 相似文献
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