基于扩张状态观测器的鲁棒转子磁链估计研究     

许思猛  陈冲 《福建工程学院学报》2011,9(4):307-311

提出了新型的基于线性扩张状态观测器的感应电动机转子磁链估计模型。以两个独立的线性扩张状态观测器观测定子电流,用分别被扩张的两个状态构建闭环转子磁链观测器,根据Lyapunov稳定性理论推导满足转子磁链观测器渐进稳定的反馈增益矩阵和转速估计自适应律。利用Matlab进行了仿真,分析了电机参数变化对磁链观测和转速估计精度的影响,表明了提出的模型对电机参数变化具有强鲁棒性。  相似文献   

终端滑模控制器设计在永磁同步电动机中的应用     

马新  平静水 《通化师范学院学报》2011,32(10):11-13

文中考虑了一类永磁同步电动机的终端滑模控制器设计问题.在控制器设计中利用中继切换控制使系统在给定的当前控制律的作用下运行到某一特定状态（或某一特定区域）后,控制律被切换到有限时间收敛的终端滑模控制器,使得系统在有限时间内达到平衡状态.终端滑模控制器的设计保证了闭环系统所有信号的有界性和平衡点的全局稳定性,以及系统在有限时间内精确地跟踪给定的参考信号.最后,通过一个数值仿真验证了所提算法的正确有效性.  相似文献   

高压电动机故障原因分析及预防对策     

尚振文 《邢台职业技术学院学报》2011,28(1):67-69

高压电动机是火力发电厂的主要电气设备之一,高压电动机故障的发生,直接影响发电厂的安全运行。本文从电动机故障情况分析,如环境、检修质量、产品质量、机械方面及运行管理等方面,减小对发电厂安全运行的威胁,减少经济损失。  相似文献   

无人直升机旋翼转速控制器设计     

吴浩彪  廖晓文  李炯权  黄伟洲 《茂名学院学报》2011,21(1):41-44

针对无人机的特殊性以及对电机动态性能的要求,设计了一种以ARM芯片LPC2148为核心的旋翼转速控制器。首先分析了直升机的飞行特点以及原旋翼转速控制器的不足,设计基于EKF和矢量控制的新旋翼转速控制器,并对扩展卡尔曼滤波法和矢量控制的模块进行说明,且给出了MATLAB仿真结果,验证了控制系统的正确性。  相似文献   

Effects of oncoming target velocities on rapid force production and accuracy of force production intensity and timing     

Yoichi Ohta 《Journal of sports sciences》2017,35(23):2304-2312

The present study aimed to clarify the effects of oncoming target velocities on the ability of rapid force production and accuracy and variability of simultaneous control of both force production intensity and timing. Twenty male participants (age: 21.0 ± 1.4 years) performed rapid gripping with a handgrip dynamometer to coincide with the arrival of an oncoming target by using a horizontal electronic trackway. The oncoming target velocities were 4, 8, and 12 m · s^?1, which were randomly produced. The grip force required was 30% of the maximal voluntary contraction. Although the peak force (Pf) and rate of force development (RFD) increased with increasing target velocity, the value of the RFD to Pf ratio was constant across the 3 target velocities. The accuracy of both force production intensity and timing decreased at higher target velocities. Moreover, the intrapersonal variability in temporal parameters was lower in the fast target velocity condition, but constant variability in 3 target velocities was observed in force intensity parameters. These results suggest that oncoming target velocity does not intrinsically affect the ability for rapid force production. However, the oncoming target velocity affects accuracy and variability of force production intensity and timing during rapid force production.  相似文献   

Motor control of practice and actual strokes by professional and amateur golfers differ but feature a distance-dependent control strategy     

《European Journal of Sport Science》2013,13(9):1204-1213

Abstract

We explored how practice and actual putting strokes differed between professionals and high-level golf amateurs, and how practice strokes reflected subtle differences in putting distances. We analysed swing amplitude, impact velocity, and acceleration profile of the club-head. The acceleration profiles showed that the motor control pattern of the practice stroke differed from that of the actual stroke. To clarify the effects of different putting distances on the practice stroke and to analyse how much the actual stroke could be explained by the practice stroke, we conducted individual regression analyses. The practice strokes of all participants could be divided into three strategies and five types by the coefficient of determination and the slope. This implies that the purpose of the practice stroke varied among golfers. Most golfers used the individual velocity criteria in their practice strokes, which resulted in different putting distances based on their criteria. Unexpectedly, we found no significant difference in skill level between professionals and high-level amateurs. The results of this study imply that the practice stroke does not duplicate the actual stroke, even for professional golfers with excellent skills. However, most high-level golfers adopted distance-dependent control strategies for slightly different putting distances.  相似文献   

幼儿双侧肢体运动对智力潜能开发作用的实验研究   总被引：3，自引：0，他引：3  

孙魏君  陈昊  戴晓雯  郭雁  高艳萍  徐本力  谢香道  苗凤藻  金赟  王谨 《山东体育学院学报》2001,17(1):13-15

学龄前儿童通过有针对性的双侧肢体的协调活动,可以改善不利侧肢体的“偏利”现象,提高幼儿身体协调性和左右侧肢体运动技能发展的均衡程度,起到开发幼儿心理潜能(如提高反应能力)的作用,运动技能的提高促进了智商的相应改善。科学、有效的方法,使幼儿的运动技能和智力的潜能得到充分的开发。  相似文献   

少儿足球训练刍议     

徐承健  吴海乐 《南京体育学院学报(社会科学版)》1998,(4)

根据运动技能形成的规律,抓住观察、思维、练习三个环节,并使之有机联系起来,结合足球运动特点进行教学与训练,方能取得理想的效果。  相似文献   

开放式与闭锁式运动技能教学方法的比较研究 ———以普通高校女生排球和大众健美操项目运动技能的习得过程为例   总被引：1，自引：0，他引：1  

王健  李宗浩 《天津体育学院学报》2007,22(1):59-62

采用教学试验法对高校体育英语和外贸英语两个非体育类专业本科女生习得排球和大众健美操项目的运动技能过程进行实证研究,结果表明:领会式教学方法对学生掌握两个项目的运动技能及其基本战术意识的形成是行之有效的手段。  相似文献   

7-10岁男子少年武术运动员动作协调能力发展特征研究   总被引：1，自引：0，他引：1  

毛浓选 《搏击·武术科学》2008,5(6)

文章运用问卷调查法、实验法、专家评定法、数据统计法,对设计的五项测试动作协调能力指标,在120名7-10岁少年武术运动员和普通学生中进行对比实验分析,研究结果表明:7-10岁少年武术运动员组协调能力发展水平整体高于普通学生组;7-9岁年龄段少年儿童动作协调能力增长速度比较快,9-10岁年龄段是协调能力发展平缓期;7-8岁年龄段是武术运动员听觉肢体协调能力和上下肢体协调能力的突增期,平均增长率在30%以上。  相似文献