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排序方式: 共有1347条查询结果,搜索用时 15 毫秒
941.
在研制惯导平台用旋转变压器过程中作者设计了一种同心-环形混合正弦分布绕相,取代了常用的同心正弦分布绕组,从而显著减少了电机的轴向尺寸,绕组电阻,用铜量和损耗,同时也提高了旋转变压器的精度。 相似文献
942.
针对S曲线存在的加速度变化率不连续的问题,建立了一种实用的正弦形速度模型,并通过基于定点DSP芯片TMS320F28332的永磁同步电机矢量控制电梯的实验,实现了正弦形速度曲线的设计。通过LabVIEW平台实时观测运行状态曲线。实验结果表明,该曲线有效地提高了电梯加减速性能,增强了电梯运行舒适性,改善了电梯的运行效果。 相似文献
943.
This paper is concerned with the exponential H∞ filtering for a class of nonlinear discrete‐time switched stochastic hybrid systems with mixed time delays and random missing measurements. The switched system under study involves stochastic disturbance, time‐varying discrete delay, bounded distributed delay and nonlinearity. Attention is focused on the design of a mode‐dependent filter that guarantees the exponential stability in the mean‐square sense and a prescribed H∞ noise attenuation level for the filtering error dynamics. By constructing a new Lyapunov functional and using the average dwell time scheme, a new delay‐dependent sufficient condition for the existence of the filter is presented in terms of linear matrix inequalities. A numerical example is finally given to show the effectiveness of the proposed design method. Copyright © 2011 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
944.
945.
LI ShengPing & FAN YingHui 《中国科学:信息科学(英文版)》2012,(7):1704-1714
This paper provides a way to optimize the overall disturbances rejection performance of the adaptive control system in the presence of unknown external disturbances.Especially,the updatable non-empty admissible model set,which is consistent to the a priori knowledge of the plant parameter and the online measurements,is computed.With the overall system performance as the criteria,the nominal model is optimally chosen within the admissible model set.The optimal nominal model is subsequently used to synthesize the optimal closed-loop controller based on the 1 design methodology.Combining the above two aspects,an optimal adaptive control scheme is proposed.Because of the consistency of the identification criteria and control object,the adaptive control scheme proposed in this paper can achieve the overall optimal disturbances rejection performance,and the effect of the interplay between the identification and control of the adaptive system can be handled effectively.In addition,the computable optimal performance is also provided. 相似文献
946.
有源中点箝位(ANPC)型多电平拓扑通过选择不同的电流通路可以使器件损耗分散在不同的开关管上。以三电平ANPC逆变器为研究对象,分析了在不同开关状态之间切换时各开关器件的损耗分布情况,采用正弦脉宽调制(SPWM)方法,提出了一种器件损耗分布平衡的控制策略。通过合理选择冗余状态使电流通过不同的路径,有效地实现了每相器件的损耗平衡。搭建三电平ANPC逆变器实验平台对提出的控制策略进行了验证。 相似文献
947.
948.
Hitoshi Katayama 《International journal of control》2013,86(9):2112-2122
We design reduced-order observers for nonlinear sampled-data strict-feedback systems with actuator dynamics and disturbances. First, we use the property of the Euler model of sampled-data systems and the structure of discrete-time observers to design reduced-order observers of the Euler model. Then, we show that the designed observers are semiglobal and practical in T for the exact model. We also give both numerical and practical examples to illustrate the proposed design of reduced-order observers. 相似文献
949.
Tansel Yucelen 《International journal of control》2013,86(6):706-721
In this article, we develop an output feedback adaptive control framework for continuous-time minimum phase multivariable dynamical systems for output stabilisation and command following. The approach is based on a nonminimal state-space realisation that generates an expanded set of states using the filtered inputs and filtered outputs and their derivatives of the original system. Specifically, a direct adaptive controller for the nonminimal state-space model is constructed using the expanded states of the nonminimal realisation and is shown to be effective for multi-input, multi-output linear dynamical systems with unmatched disturbances, unmatched uncertainties and unstable dynamics. The proposed adaptive control architecture requires only knowledge of the open-loop system's relative degree as well as a bound on the system's order. Several illustrative numerical examples are provided to demonstrate the efficacy of the proposed approach. 相似文献
950.
This paper describes the problem of load disturbance rejection using feedforward for the case when perfect compensation is not realizable due to processes delays inversion. First, a new generalized open-loop design tuning rule for feedforward compensators is proposed. Simple and intuitive guidelines are given for aggressive, moderate, and conservative performance results. Moreover, a switching feedforward compensator is proposed to be used when oscillations are not allowed in the process output. Simulation results show important improvements in disturbance rejection, reference tracking error and control effort. 相似文献