排序方式: 共有19条查询结果,搜索用时 15 毫秒
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提出一种模糊逻辑扩展动态矩阵算法,该算法的主要思想是在不同工作点作阶跃响应,建立局部线性模型,然后利用隶属函数对局部线性模型进行加权。并将约束输入思想引入到DMC算法中来,避免求逆矩阵。实现起来占用内存小,计算速度快。算法对于系统开环y-u曲线单调递增或递减的情况,只要做3个工作点的阶跃响应即可建立起系统模型;即使开环y-u曲线不单调,也可以对系统进行分段处理建立模型。算法的应用范围较广。对非线性连续发酵过程的仿真研究表明该算法控制效果较好,具有很好的理论和实践价值。 相似文献
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Renewable energy systems provide opportunities for developing methods to evaluate their sustainability claims, inclusive of their life cycles, and to rank them based on their broader impact. In this paper, a fuzzy-logic-based method is proposed to evaluate and rank wind turbines as sustainable systems handling wind energy, in terms of renewability and environmental friendliness. Implementation of the proposed method is demonstrated in two steps: First, major factors defining life cycle and sustainability characteristics of wind turbines are identified. These factors are: Capital Cost, Greenhouse Gas Emission, and wind turbine Energy Efficiency. Nevertheless, the method allows expansion to include other factors, which may later be deemed as critical to the evaluation process. Second, a fuzzy-logic-based model is built and tested using hypothetical data to prove the concept. As a result, the relatively best sustainability is decided on a single dimension scale. The proposed method produced reliable results in terms of ordinally ranking the sustainability of wind turbines, but with interdependencies based on the entire group of wind turbine cases being examined. The proposed method formulates a satisfactory stepping stone on the way to establish a unified method and process to rank wind turbines based on sustainability. 相似文献
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为了改善扩展卡尔曼滤波(EKF)算法在机动目标跟踪中的跟踪性能,文中研究了一种固定指数加权模糊自适应扩展卡尔曼滤波技术,通过监视理论残差和实际残差的协方差一致程度。应用模糊推理系统不断调整滤波协方差,对扩展卡尔曼滤波器(EKF)进行在线自适应控制.最终实现最优估计。仿真结果表明,改进的算法稳定性高,精度得到明显改善.用于弱机动目标跟踪效果较好。 相似文献
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在介绍和对比了国内外风力发电技术的研究和应用状况的基础上,以获得最大风能捕获为目的,提出了风力发电系统变桨距控制器的设计。针对风力发电系统数学模型复杂,受参数变化和外部干扰严重,具有非线性、时变、强耦合的特点,将模糊控制引入到风力发电控制系统中,用模糊控制器作为变桨距系统的控制器,在风速高于额定风速的情况下,根据风速的变化调整桨叶节距角,从而调节发电机的输出功率,使风力发电机组的输出功率保持稳定。最后,利用Simulink构建整个控制系统,对系统进行Matlab仿真。结果表明,使用模糊控制变桨距控制器的风力发电系统确实具有更好的动态性能、收敛速度和静态误差,从而为今后进一步研究奠定了一定的基础。 相似文献
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袁庆生 《西安工业学院学报》2005,25(5):492-494
对凡代数作进一步研究,证明了有限的非全序R0代数至少存在两个不同的分子和原子,引入并讨论了R0代数中界元的性质,得到了非全序尺。代数的一些蕴涵性质,给出了元素个数最少的含中界元的非全序R0代数的例子,从而确定了含中界元的非全序R0代数的存在性. 相似文献
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This study developed a hybrid fuzzy-logic and neural-network controller (HFNC) for multiple-input multiple-output (MIMO) systems. The HFNC consists of a fuzzy logic controller (FLC) which was designed to control each degree of freedom (DOF) of a MIMO system individually and an additional coupling neural network which was incorporated into the FLC to compensate for the dynamic coupling effects between each DOF of the MIMO system. Stability and robustness of the HFNC have been demonstrated using a state-space approach. From the simulation results of the 2-link robotic manipulator application and the experimental results of the 6-DOF robot tests, the HFNC demonstrated more superior control performance than the FLC. 相似文献
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介绍塑料挤压机温度模糊控制系统的设计方法,采用变结构模糊控制算法解决大惯性延迟环节的温度控制,采用补偿算法解决多点加热温度耦合问题,获得较好的控制效果;该设计用于工控机集中控制塑料挤压机温控系统取得成功,温度控制响应速度快、控制误差小,且无超调;实验表明,该方法用于解决大惯性、强耦合的温度控制问题具有积极的效果。 相似文献