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基于内置力执行器的铣削颤振的主动控制 被引量:13
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作者 乔晓利 祝长生 《机械工程学报》 EI CAS CSCD 北大核心 2012年第1期185-192,共8页
高速加工中铣削颤振不仅降低工件的表面加工质量,严重时还会造成刀具或者其他加工部件的损坏,因此对电主轴铣削颤振进行控制具有重要的意义。为对电主轴铣削过程中的颤振进行有效控制,在双绕组无轴承感应电动机的基础上,提出一种具有内... 高速加工中铣削颤振不仅降低工件的表面加工质量,严重时还会造成刀具或者其他加工部件的损坏,因此对电主轴铣削颤振进行控制具有重要的意义。为对电主轴铣削过程中的颤振进行有效控制,在双绕组无轴承感应电动机的基础上,提出一种具有内置力执行器的感应型高速电主轴结构,建立电主轴—刀具系统的有限元模型、动态铣削模型、双绕组感应型电主轴电磁力模型,在对具有内置力执行器的感应型高速电主轴电磁力进行解耦后,提出基于内置力执行器的电主轴铣削颤振的主动控制方案,通过仿真分析控制器的主要参数对电主轴铣削稳定性的影响。结果表明采用具有内置力执行器的感应型高速电主轴能够有效地提高电主轴铣削的稳定区域以及在抑制铣削颤振方面具有明显效果。 展开更多
关键词 电主轴 颤振 力执行器 振动控制
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基于内置力执行器的砂轮不平衡振动主动控制 被引量:4
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作者 乔晓利 祝长生 《振动与冲击》 EI CSCD 北大核心 2012年第24期125-130,共6页
为了有效地控制由砂轮质量不平衡引起的不平衡振动,提出一种新的控制砂轮不平衡振动的主动控制方案,该控制方案中用来抑制振动的电磁力源于无轴承电机径向磁悬浮力产生的原理。首先研究双绕组感应型电主轴的结构及工作原理,径向控制力... 为了有效地控制由砂轮质量不平衡引起的不平衡振动,提出一种新的控制砂轮不平衡振动的主动控制方案,该控制方案中用来抑制振动的电磁力源于无轴承电机径向磁悬浮力产生的原理。首先研究双绕组感应型电主轴的结构及工作原理,径向控制力的模型及砂轮的受力模型,用有限元法建立了感应型柔性电主轴-砂轮的动力学模型,设计了感应型柔性电主轴-砂轮不平衡振动的主动控制系统,用有限元法分析当电机转子偏心和不偏心时,控制绕组电流加入对电机内部性能的影响,结果表明该控制方案完全可行并且对抑制砂轮端不平衡振动具有显著作用。 展开更多
关键词 砂轮不平衡振动 振动控制 力执行器
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利用开放平台 提供优质设备——访瑞士搏力谋执行器有限公司产品经理袁三明
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《智能建筑与城市信息》 2004年第6期16-17,共2页
关键词 建筑自动化系统 开放平台 优质设备 智能建筑 瑞士搏执行器有限公司 袁三明
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基于模式力的平面电机控制方法 被引量:5
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作者 周赣 黄学良 +3 位作者 周勤博 傅萌 张前 冯传水 《电工技术学报》 EI CSCD 北大核心 2009年第2期20-26,共7页
半导体光刻加工中,平面电机的6个运动自由度之间存在着紧密的电磁和力学耦合,为实现对这6个运动自由度的解耦控制,首先提出了作为执行器的直线电机的电流控制模型,接着提出了执行器力、模式力的概念和基于模式力的解耦动力学模型。基于... 半导体光刻加工中,平面电机的6个运动自由度之间存在着紧密的电磁和力学耦合,为实现对这6个运动自由度的解耦控制,首先提出了作为执行器的直线电机的电流控制模型,接着提出了执行器力、模式力的概念和基于模式力的解耦动力学模型。基于对样机的运动学和结构参数的合理假设,模式力法可使6个运动自由度的动力学模型之间不再存在耦合,且都为简单的2阶线性系统,可采用多种线性控制器来进行控制。针对样机,推导出了模式力矢量与执行器力矢量的关系矩阵以及平面电机的解耦控制框图,最后以X位置控制为例设计了PD控制器,并对基于模式力的控制方法的可行性进行了探讨。 展开更多
关键词 平面电机 模式 执行器
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三体随动跟踪式重力卫星姿态与无拖曳控制方法
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作者 廖鹤 郑多锦 +2 位作者 赵艳彬 祝竺 谢进进 《宇航学报》 EI CAS CSCD 北大核心 2022年第11期1499-1510,共12页
采用非接触洛伦兹力执行器代替微推进系统,提出一种“质量块—载荷舱—平台舱”三体随动跟踪式重力卫星总体架构,避免传统低低跟踪重力场测量卫星设计中的质心波动与执行机构带来的动力学不确定性影响。其次,建立了该架构下的卫星姿轨... 采用非接触洛伦兹力执行器代替微推进系统,提出一种“质量块—载荷舱—平台舱”三体随动跟踪式重力卫星总体架构,避免传统低低跟踪重力场测量卫星设计中的质心波动与执行机构带来的动力学不确定性影响。其次,建立了该架构下的卫星姿轨耦合动力学模型,并在此基础上针对动力学非线性耦合项的影响,构建了一种基于带宽参数化自适应补偿的复合自抗扰控制方法,提升姿态与无拖曳控制性能。最后,采用数学仿真验证了所提出的重力卫星总体架构及其控制方法的有效性。仿真结果表明,该方法有效提升了系统的频域性能。 展开更多
关键词 三体随动跟踪式 洛伦兹力执行器 带宽参数化 复合自抗扰控制 姿态与无拖曳控制
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砂轮不平衡振动主动控制的实验研究 被引量:5
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作者 乔晓利 祝长生 《振动工程学报》 EI CSCD 北大核心 2017年第1期55-61,共7页
砂轮不平衡振动会影响工件表面的质量,降低砂轮的耐用度。为了降低由砂轮不平衡振动造成的危害,作者提出了一种内置力执行器的砂轮不平衡振动主动控制方案,并在前期进行了理论分析与研究。在此基础上,对内置力执行器电机的绕组参数及柔... 砂轮不平衡振动会影响工件表面的质量,降低砂轮的耐用度。为了降低由砂轮不平衡振动造成的危害,作者提出了一种内置力执行器的砂轮不平衡振动主动控制方案,并在前期进行了理论分析与研究。在此基础上,对内置力执行器电机的绕组参数及柔性电主轴-转子系统进行了设计;并借助DSP2812建立了砂轮不平衡振动主动控制的实验平台。在此平台上,对不同转速下砂轮的不平衡振动进行了主动控制的实验研究,证明了该主动控制方案在控制砂轮端不平衡振动方面的可行性,为进一步的应用研究提供了参考依据。 展开更多
关键词 振动控制 砂轮 不平衡振动 力执行器
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Nonlinear static characteristics of piezoelectric unimorph bending micro actuators 被引量:1
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作者 康新 董萼良 章定国 《Journal of Southeast University(English Edition)》 EI CAS 2010年第4期603-607,共5页
The nonlinear static characteristic of a piezoelectric unimorph cantilever micro actuator driven by a strong applied electric field is studied based on the couple stress theory.The cantilever actuator consists of a pi... The nonlinear static characteristic of a piezoelectric unimorph cantilever micro actuator driven by a strong applied electric field is studied based on the couple stress theory.The cantilever actuator consists of a piezoelectric layer,a passive(elastic)layer and two electrode layers.First,the nonlinear static characteristic of the actuator caused by the electrostriction of the piezoelectric layer under a strong applied electric field is analyzed using the Rayleigh-Ritz method.Secondly,since the thickness of the cantilever beam is in micro scale and there exists a size effect,the size dependence of the deformation behavior is evaluated using the couple stress theory.The results show that the nonlinearities of the beam deflection increase along with the increase of the applied electric field which means that softening of the micro beam rigidity exists when a strong external electric field is applied.Meanwhile,the optimal value of the thickness ratio for the passive layer and the piezoelectric layer is not around 1.0 which is usually adopted by some previous researchers.Since there exists a size effect of the micro beam deflection,the optimal value of this thickness ratio should be greater than 1.0 in micro scale. 展开更多
关键词 nonlinear static characteristic piezoelectric unimorph micro actuator couple stress theory Rayleigh-Ritz method
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Hysteresis model of magnetostrictive actuators and its numerical realization 被引量:3
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作者 TANG Zhi-feng LV Fu-zai XIANG Zhan-qin 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第7期1059-1064,共6页
This paper presents two numerical realization of Preisach model by Density Function Method (DFM) and F Function Method (FFM) for a giant magnetostrictive actuator (GMA). Experiment and simulation showed that FFM is be... This paper presents two numerical realization of Preisach model by Density Function Method (DFM) and F Function Method (FFM) for a giant magnetostrictive actuator (GMA). Experiment and simulation showed that FFM is better than DFM for predicting precision of hysteresis loops. Lagrange bilinear interpolation algorithm is used in Preisach numerical realization to enhance prediction performance. A set of hysteresis loops and higher order reversal curves are predicted and experimentally verified. The good agreement between the measured and predicted curves shows that the classical Preisach model is effective for modelling the quasi-static hysteresis of the GMA. 展开更多
关键词 MAGNETOSTRICTIVE ACTUATOR HYSTERESIS Density Function Method (DFM) F Function Method (FFM)
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Modeling of electrode system for three-phase electric arc furnace 被引量:5
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作者 王琰 毛志忠 +2 位作者 田惠欣 李妍 袁平 《Journal of Central South University》 SCIE EI CAS 2010年第3期560-565,共6页
To simulate the process of electrode operation, a dynamic model describing the electrode system of three-phase electric arc furnace was developed. This new model can be divided into three submodels in terms of the pra... To simulate the process of electrode operation, a dynamic model describing the electrode system of three-phase electric arc furnace was developed. This new model can be divided into three submodels in terms of the practical situation. They are the power supply system model the electric arc model and the hydraulic actuator system model. According to the basic circuit theory, the power supply system model where the high voltage transmission circuit and mutual inductances were considered, was set up. The electric arc model, which was novel for the electrode control, served as the electrical load and was connected to the power supply system model. The hydraulic actuator system model consists of the proportional valve part that is modeled to capture the dead-zone nonlinear characteristics and the hydraulic cylinder part where the impact of the load force is taken into account. By comparing simulation data and actual data, the results show that the electrode system model is proved to be accurate. 展开更多
关键词 electric arc furnace electrode system model electric arc model SIMULATION
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Impact of load impedance on the performance of a thermoacoustic system employing acoustic pressure amplifier
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作者 Ke TANG Zhong-jie HUANG +1 位作者 Tao JIN Guo-bang CHEN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第1期79-87,共9页
An acoustic pressure amplifier (APA) is capable of improving the match between a thermoacoustic engine and a load by elevating pressure ratio and acoustic power output. A standing-wave thermoacoustic engine driving a ... An acoustic pressure amplifier (APA) is capable of improving the match between a thermoacoustic engine and a load by elevating pressure ratio and acoustic power output. A standing-wave thermoacoustic engine driving a resistance- and-compliance (RC) load through an APA was simulated with linear thermoacoustics to study the impact of load impedance on the performance of the thermoacoustic system. Based on the simulation results, analysis focuses on the distribution of pressure amplitude and velocity amplitude in APA with an RC load of diverse acoustic resistances and compliance impedances. Variation of operating parameters, including pressure ratio, acoustic power, hot end temperature of stack, etc., versus impedance of the RC load is presented and analyzed according to the abovementioned distribution. A verifying experiment has been performed, which indicates that the simulation can roughly predict the system operation in the fundamental-frequency mode. 展开更多
关键词 Thermoacoustic engine Acoustic pressure amplifier (APA) THERMOACOUSTICS
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Control of a Rigid-Flexible Satellite Solar Panel with Non-collocated Sensor/Actuator
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作者 Luiz Carlos Gadelha de Souza 《Journal of Mechanics Engineering and Automation》 2015年第3期173-179,共7页
This paper presents a model and analysis for a flexible link with non-collocations of sensors and actuators. It shows the changes in the system dynamics and the appearance of zeroes in the right-plan complex, turning ... This paper presents a model and analysis for a flexible link with non-collocations of sensors and actuators. It shows the changes in the system dynamics and the appearance of zeroes in the right-plan complex, turning the system a non-minimum phase system. The performance of the PID (proportional-integral-derivative) and LQR (linear quadratic regulator) controller are discussed considering the zero dynamics of the system in three points of special interest: (I) the collocated case, when the sensor is in the base of the link; (2) the critical case, where the system starts to present zeroes in the right-plan complex and (3) the limit case, when the sensors are in the end point of the flexible link. Investigation for a simple rigid-flexible model with one mode, in the three cases, the PID and LQR controller performance are damage. To deal with this kind of problem, new control techniques should be developed. 展开更多
关键词 Satellite control flexible system non-collocated sensor and actuator.
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