共查询到20条相似文献，搜索用时 893 毫秒
1.
In this paper, an intelligent self-repairing control scheme is proposed for a class of nonlinear MIMO system. A direct self-repairing controller of a nonlinear SISO system is firstly designed, and then the control scheme is promoted to a nonlinear MIMO system. The error signals are replaced by the state variables to deal with the high derivate problems of the desired signals and a nonlinear regulating function is brought in to improve the performances of the sliding mode. The self-repairing controller is made up of four parts: the nonlinear regulator, the equal controller, the compensator I and the compensator II. The control method is applied to a helicopter flight control system with loss-in-effectiveness faults. Some simulation results illustrate the effectiveness and feasibility of the proposed control scheme in the paper. 相似文献
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按转子磁链定向的矢量控制系统仿真研究 总被引：2，自引：0，他引：2
详细分析矢量控制系统对异步电机电磁转矩实时控制的原理,构建带转矩内环磁链闭环按照转子磁链定向矢量控制结构,对系统的各部分进行了详细的阐述。利用仿真工具建立了仿真模型,结果表明该方法实现电磁转矩控制,达到良好的调速性能。 相似文献
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H.R. Marzban 《Journal of The Franklin Institute》2004,341(3):279-293
A method for finding the optimal control of a linear time varying delay system with quadratic performance index is discussed. The properties of the hybrid functions which consists of block-pulse functions plus Legendre polynomials are presented. The operational matrices of integration, delay and product are utilized to reduce the solution of optimal control to the solution of algebraic equations. Illustrative examples are included to demonstrate the validity and applicability of the technique. 相似文献
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A maximum principle is formulated and validated for the vibration control of an annulus plate with the control forces acting on the boundary. In addition, the maximum principle can be applied to plates with multiply connected domains. The performance index is specified as a quadratic functional of displacement and velocity along with a suitable penalty term involving the control forces. Using this index an explicit control law is derived with the help of an adjoint variable satisfying the adjoint differential equation and certain terminal conditions together with the proposed maximum principle. The implementation of the theory is presented and the effectiveness of the boundary control is investigated by a numerical example. 相似文献
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Farhad Assadian 《Journal of The Franklin Institute》2002,339(3):347-360
The performance enhancement of dynamic systems is accomplished by the application of active control components. Control strategies are derived to accomplish the task. Among the various control strategies, those that are designed to minimize a specified cost function while satisfying the necessary system constraints are referred to as optimal controllers. An important constraint is the amount of power and energy consumed by the control device. In this paper, the effect of optimal control strategies on the power and energy requirement of control devices is investigated. 相似文献
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Ismet Sahin 《Journal of The Franklin Institute》2006,343(2):168-180
This paper is concerned with deriving an optimal flow and routing control policy for two-node parallel link communication networks with multiple competing users. The model assumes that each user has a flow demand which needs to be optimally selected and routed on the network links. The flow and routing control policy for each user seeks to maximize the user's total throughput and minimize its expected delay. To derive such a policy, we consider a utility function for each user that combines these two objectives in an additive fashion with preference constants that can be adjusted to reflect the user's own preferences between maximizing throughput and minimizing delay. Additionally, we provide each user with the ability to make these preferences link-dependent to reflect the user's preferences for certain links over others in the network. A condition that depends on the link capacities and preference constants is derived to guarantee the existence and uniqueness of a non-symmetric flow and routing control policy solution which satisfies the Nash equilibrium of non-cooperative game theory. The Nash equilibrium is a desirable solution for such networks because it insures that no user can improve its utility by unilaterally deviating from its Nash control policy. We discuss in detail several interesting properties of this equilibrium and in particular, its relationship to the users’ preference constants. Two illustrative examples are also presented. 相似文献
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The paper deals with the optimal control of a distributed host structure consisting of two elastically connected complex continuous double-string system and subjected to certain excitation load. Investigation of the behavior of such system is of great theoretical and practical importance. A technique is proposed to actively damp out the undesired vibrations in the structures by a combination of applied actuators and displacement feedback gains. Two performance measures, involving energies at the terminal time as well as applied and feedback control efforts, are introduced. The optimality conditions of the applied actuators are derived by using the method of eigenfunction expansion and calculus of variations. The feedback parameters are numerically determined from the solution of a minimization problem. The proposed approach is illustrated by a numerical example involving a system which consists of two strings subjected to a continuous load. 相似文献
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开关磁阻电动机的非线性模型预测控制 总被引：3，自引：0，他引：3
将非线性预测控制应用于ＳＲＭ传动系统,建立了非线性参数预测模型,并在此基础上优化、校正,设计了ＳＲＭ的非线性速度预测控制器。该控制器具有实时预测、实时优化、实时校正的特点,很好地补偿了ＳＲＭ的非线性特性。与传统ＰＩ控制器相比,非线性模型预测控制器能提供更好的动态、静态特性,转矩脉动大为减小。（仿真结果表明,该控制策略不但正确、有效,而且使ＳＲＭ传动系统性能得到改善。 相似文献
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Aaron D. Schutte 《Journal of The Franklin Institute》2010,347(1):208-227
This paper develops a unified approach for modeling and controlling mechanical systems that are constrained with general holonomic and nonholonomic constraints. The approach conceptually distinguishes and separates constraints that are imposed on the mechanical system for developing its physical structure between constraints that may be used for control purposes. This gives way to a general class of nonlinear control systems for constrained mechanical systems in which the control inputs are viewed as the permissible control forces. In light of this view, a new and simple technique for designing nonlinear state feedback controllers for constrained mechanical systems is presented. The general applicability of the approach is demonstrated by considering the nonlinear control of an underactuated system. 相似文献
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A problem of stabilization about uncertain networked control systems (NCSs) with random but bounded delays is discussed in this paper. By using augmented state-space method, this class of problems can be modeled as discrete-time jump linear systems governed by finite-state Markov chains. A new switched model based on probability is proposed to research problems of reliable control when actuators become ageing or partially disabled. Using improved V-K iteration algorithm, a class of reliable controllers are designed to make systems asymptotically mean square stable under several stochastic disturbances such as random time-delay and stochastic actuator failure and the maximal redundancy degree is given through this method. 相似文献
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This paper focuses on automatic climbing control methods for large civil aircraft. The key technique is how to design automatic flight control laws that meet the requirements of flight performance indexes and have good characteristics of restraining various disturbances. The classical engineering methods are used to solve the above problem. Based on the aerodynamic data of Boeing707, a nonlinear model of large civil aircraft is established. Linear models which are divided into longitudinal and lateral equations are obtained by trim and linearization. The design of longitudinal control laws uses C? criterion, three climbing schemes including pitch control mode, vertical velocity control mode and altitude control mode are designed and mutually compared. For lateral control problem, by the feedback angle of sideslip, the bank attitude control with good effect is achieved. The simulation results indicate the designed control laws can meet the requirements of performance indexes, and have satisfied characteristics of anti-gust disturbance. 相似文献
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目前,关于契约控制和社会控制的互动关系存在两种相互矛盾的观点。针对现有研究中的不足,提出了组织间学习、控制方式和技术创新之间关系的研究框架,分析了在中国商业传统条件下两种控制方式的互动关系及其对技术创新的影响。 相似文献
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提出了利用Ｄ／Ａ转换特性研制数控恒流器件的方法,从理论上分析了器件的设计思想和性能,并研制成功新型数控恒流器件．测试结果表明,该器件样管具有优良的电性能,同时具有体积小、功率损耗低等优点． 相似文献
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To stabilize both amplitude and frequency of the second-order harmonic oscillator double-fold sliding mode control is employed. The first, integral sliding mode control, is used to compensate for the disturbance/uncertainty, which is unmatched by the second control. The second sliding mode control is designed to achieve the stabilization of the harmonic oscillator system while the system is in the integral sliding mode. The first (integral) and second sliding mode controls are implemented in both formats: traditional sliding mode control that requires high-frequency oscillating control action and second-order sliding mode (super-twisting) control that is continuous and provides for the higher accuracy of stabilization. It is shown that the output of the double-fold sliding mode controlled second-order harmonic oscillator is robust to bounded disturbances and model parameter uncertainties. Computer simulations are performed to manifest the theoretical analysis. 相似文献
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基于模糊控制的卫星大角度姿态机动控制方法研究 总被引：1，自引：0，他引：1
本文设计了一个典型Mamdani类PD型模糊控制器来研究卫星大角度姿态机动控制问题。卫星姿态机动控制要求控制系统响应快、具有较强鲁棒性。模糊控制器的设计十分灵活，在控制性能方面有自己突出的特点。通过仿真，考察了模糊控制器的隶属函数在各种参数下的不同控制性能，与一个传统I/O解耦PID控制器的控制效果进行比较，并验证了模糊控制器的鲁棒性。仿真结果证实模糊控制用于姿态机动控制有良好的效果。 相似文献
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在航空航天产品研究与开发的过程中,关键技术的成熟度是必要的评价环节,也是控制此类产品研发过程风险的重要参照。本文在NASA技术成熟度测度分级体系(TRL)的基础上,将研究与开发活动分为技术风险控制为目标的技术导向集成(TOI)和以组织战略框架下时限进度控制为目标的时限导向集成(SOI)型开发活动,并依照技术成熟度分级管理模式原理,提出适合高复杂产品研发管理的一种技术瓶颈与时限制约相协调的双路风险控制的研发组织体系,对航空航天企业建设规范的研发机制以及相应的技术成熟度管理机制提供参考。 相似文献
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基于创新力与控制力动态均衡的企业持续成长路径分析 总被引：2，自引：0，他引：2
本文提出了一个关于企业持续成长路径的一般性分析框架,认为企业持续成长过程中创新力和控制力的均衡是指两力在适当的对象、适当的时机、适当的方法以及适当的力度四个方面的均衡,企业的持续成长就是创新力和控制力的统一朝着最优均衡状态不断逼近的过程。文章认为企业持续成长的关键在于建立完善的企业创新体系和企业创新推动型控制体系,并实现两者之间的有机融合。 相似文献