检索结果-内蒙古大学图书馆

作者： Verlohren, Christoph Muenchhof, Marco Singh, Tarunraj Laboratory for Control Engineering and Mechatronics Institute of Automatic Control 64283 Darmstadt Germany Department of Mechanical and Aerospace Engineering University at Buffalo Buffalo NY-14260 United States

ISBN: (纸本)9781424474264

This paper applies an optimal control approach to an hydraulic system. An approach is proposed to use an open-loop control on the model of a real hydraulic system. The approach uses a feedback control, to create a closed-loop control. The results of this approach are tested against different linear controls applied to the hydraulic system. The paper shows that the proposed approach can be used on oscillatory and also on systems, where the system dynamics are not exactly known. © 2010 AACC.

关键词： Linear control systems

来源：评论

学校读者我要写书评

暂无评论

The establishment of a sound transmit model in micro-nano aperture membrane and experimental verification

引用

Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology 2011年第SUPPL. 1期43卷 372-375页

作者： Lin, Wan-Feng Lou, Wen-Zhong Xu, Jing National Key Laboratory of Mechatronics Engineering and Control Beijing Institute of Technology Beijing 100081 China Department of Physics Air Force Aviation University Changchun 130022 China School of Science Changchun Institute of Technology Changchun 130012 China

We establish the sound absorption mode of micro-nano aperture membrane material according to the classic porous media acoustic theory and cylindrical shell model theory and considering the viscous resistance theory and the heat conduction theory as well. Comparing the theoretical result obtained by simulating the sound absorption property through Matlab and the experimental result, we prove the validity of the mode and it conforms to the sound absorption law of the porous material. We predict the Acoustic Propagation roperties of ordered mesoporous thin film using this mode and find the absorption coefficient is very small and the absorption property of the micro-nano aperture membrane is poor.

关键词： Heat conduction

来源：评论

学校读者我要写书评

暂无评论

Investigation of a rotary-linear switched reluctance motor

Investigation of a rotary-linear switched reluctance motor

引用

19th International Conference on Electrical Machines, ICEM 2010

作者： Pan, J.F. Cheung, N.C. Cao, Guang-Zhong Department of Automation College of Mechatronics and Control Engineering Shenzhen University Shenzhen China Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong Hong Kong

ISBN: (纸本)9781424441754

A novel direct-drive rotary-linear switched reluctance motor (RLSRM) is proposed. The motor has the advantages of robust mechanical structure, low manufacture cost and capability of operation under hostile environments. Simulation tools such as finite element analysis (FEA) are applied for the verification of motor performance and corresponding experiments are carried out to testify the simulation results. The authors expect that the innovative actuator design can be applied in industrial applications that require both rotary and linear motions. ©2010 IEEE.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Real-time on-line parameter estimation of linear switched reluctance motor

Real-time on-line parameter estimation of linear switched re...

引用

作者： Cheung, N.C. Pan, J.F. Li, Jin-Quan Department of Automation College of Mechatronics and Control Engineering Shenzhen University Shenzhen China Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong Hong Kong

ISBN: (纸本)9781424441754

The on-line least-square identification method is applied for the linear switched reluctance motor (LSRM) based closed-loop control system. Since switched reluctance motors have severe nonlinear characteristics, on-line system identification for model parameters is the basis for precise modeling and effective control algorithms. By on-line parameter identification of LSRM with least-square scheme, the parameter characteristics can be predicted despite of operation variations. The experimental results demonstrate the identification scheme has fast response and converging speed and the capability of effective parameter prediction under different conditions. ©2010 IEEE.

关键词： Closed loop control systems

来源：评论

学校读者我要写书评

暂无评论

Spindle radial motion error measurement using two-dimensional atomic encoder

Spindle radial motion error measurement using two-dimensiona...

引用

10th International Symposium on Measurement and Quality control 2010, ISMQC 2010

作者： Chaikool, Patamaporn Aketagawa, Masato Okuyama, Eiki Soeatuptim, Jaratsri Nimnual, Nusorn Department of Information Science and Control Engineering Nagaoka University of Technology Japan Department of Mechanical Engineering Nagaoka University of Technology Japan Department of Mechanical Engineering Akita University Japan Department of Mechatronics Engineering Pathumwan Institute of Technology Thailand

ISBN: (纸本)9781617820199

Since research and development in nanotechnology and precision engineering has progressed rapidly, a reduction of rotating errors of an ultra precise spindle is required. However, the conventional spindle measurement requires some technique to separate the spindle error motion from the artifact form error. Also the application with sub-nanometer order is questionable. In this research, the new technique to measure the spindle radial motion error using the atomic encoder is proposed. In this paper, the principle of measurement, design concept of the instrument, and some experimental results of the 2-D atomic encoder will be discussed.

关键词： Precision engineering

来源：评论

学校读者我要写书评

暂无评论

Research on servo feeding system of micro WEDM

Research on servo feeding system of micro WEDM

引用

International Conference on Digital Manufacturing and Automation

作者： Huang, R.N. Lou, Y.J. Chi, G.X. Division of Control and Mechatronics Engineering Harbin Institute of Technology Shenzhen Graduate School Shenzhen China Department of Mechanical Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9780769542867

This paper presents a servo feeding system of Micro WEDM. It applied incomplete derivation PID controller to reduce overshoot, and adopted adaptive dead-zone inverse compensation to eliminate dead-zone, which caused by piezoelectric ceramics motions in low speed. The result of simulation shows that this method can make the system to recover its linearity and the dead-zone parameters are convergent. And the result of experiment shows that the servo feeding system satisfies the need of Micro WEDM. © 2010 IEEE.

关键词： Feeding

来源：评论

学校读者我要写书评

暂无评论

Robust delay-dependent α-synchronization of a class of uncertain noise-perturbed time-delayed chaotic and hyper-chaotic systems

Robust delay-dependent α-synchronization of a class of unce...

引用

2010 International Conference on Computer Applications and Industrial Electronics, ICCAIE 2010

作者： Sadeghi, Mokhtar Sha Sojoodi, Mahdi Control Dept. Electrical and Electronics Engineering Faculty Shiraz University of Technology Shiraz Iran Department of Mechatronics School of Emerging Technologies Engineering University of Tabriz Tabriz Iran

ISBN: (纸本)9781424490554

In this paper, a robust delay-dependent α-synchronization via output feedback for a class of uncertain noise-perturbed time-delayed chaotic systems with unequally perturbed parameters is considered. Based on the Lyapunov-Krasovskii stability theorem and linear matrix inequality (LMI) technique, a criterion is obtained to guarantee that the slave system is robustly α-synchronized to the master system, and the effects of noise perturbation on the synchronization error is attenuated to a prescribed level using an H∞ performance index. Finally, numerical simulations on chaotic and hyper chaotic systems are presented to show the effectiveness of the proposed synchronization scheme. © 2010 IEEE.

关键词： Linear matrix inequalities

来源：评论

学校读者我要写书评

暂无评论

Robust Attitude control of Low Earth Orbit Small Satellite Subject to Actuator Saturation

Robust Attitude Control of Low Earth Orbit Small Satellite S...

引用

Electronics, Computer, Telecommunications and Information Technology International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology

作者： Peerawat Artitthang Veerachai Malyavej Manop Aorpimai Department of Control Instrumentation and Mechatronics Faculty of Engineering Mahanakorn University of Technology

ISBN: (纸本)9781424456062

The electromagnetic torquer is the most common method to generate torque for attitude control of low earth orbit (LEO) small satellite. Due to power consideration, an actuator saturation is one of serious problem in practice. In this paper, we propose the scheme to design the robust controller to stabilize a satellite attitude by considering the actuator saturation as a structured uncertainty which is based on integral quadratic constraint. The proposed robust controller is of linear time varying controller that has similar structure as conventional linear quadratic regulator (LQR). The simulation results show that our proposed robust controller outperforms an LQR controller.

关键词： Attitude control Small satellite Robust control

来源：评论

学校读者我要写书评

暂无评论

Intelligent scaling of features in fault diagnosis

Intelligent scaling of features in fault diagnosis

引用

7th International Conference on Condition Monitoring and Machinery Failure Prevention Technologies 2010, CM 2010/MFPT 2010

作者： Juuso, Esko Lahdelma, Sulo Control Engineering Laboratory Department of Process and Environmental Engineering P.O.Box 4300 FI-90014 University-of-Oulu Finland Mechatronics and Machine Diagnostics Laboratory Department of Mechanical Engineering P.O.Box 4200 FI-90014 University-of-Oulu Finland

ISBN: (纸本)9781618390134

Automatic fault detection with condition indices enables reliable condition monitoring to be combined with process control. Useful information on different faults can be obtained by selecting suitable features. Generalised norms can be defined by the order of derivation, the order of the moment and sample time. These norms have the same dimensions as the corresponding signals. The nonlinear scaling used in the linguistic equation approach extends the idea of dimensionless indices to nonlinear systems. Condition indices are obtained from short samples by means of the scaled values and linear equations. Indices, which are used in the same way as the process measurements in process control, detect differences between normal and faulty conditions and provide an indication of the severity of the faults. The generalised norms represent the norms from the minimum to the maximum in a smoothly increasing way. The new nonlinear scaling methodology based on generalised norms and skewness provides good results for the automatic generation of condition indices. Additional sensitivity is achieved for the values which differ only slightly from the centre values. For cavitation, the new approach provides four levels from cavitation-free to clear cavitation. For the supporting rolls of a lime kiln, it provides an efficient indication of faulty situations. Sensitivity is also improved for small fluctuations. All the supporting rolls can be analysed using the same approach throughout the data set. The results of both the applications are consistent with the vibration severity criteria: good, usable, still acceptable, and not acceptable. Warning and alarm limits can be defined and fault types can also be identified with fuzzy set systems and specialised condition indices.

关键词： Cavitation

来源：评论

学校读者我要写书评

暂无评论

Generalised lp norms in vibration analysis of process equipments

Generalised lp norms in vibration analysis of process equipm...

引用

7th International Conference on Condition Monitoring and Machinery Failure Prevention Technologies 2010, CM 2010/MFPT 2010

作者： Lahdelma, Sulo Juuso, Esko Mechatronics and Machine Diagnostics Laboratory Department of Mechanical Engineering University of Oulu P.O. Box 4200 FI-90014 Finland Control Engineering Laboratory Department of Process and Environmental Engineering University of Oulu P.O. Box 4300 FI-90014 Finland

ISBN: (纸本)9781618390134

Advanced signal processing methods combined with automatic fault detection enable reliable condition monitoring for long periods of continuous operation. Rapid changes in acceleration become emphasised upon the derivation of the signal x(2) . The aim is to detect faults at an early stage by using the absolute values of the dynamic part of the signals. Generalised norms p M p can be defined by the order of derivation ( ), the order of the norm ( p ) and sample time ( ), where and p are real numbers. These norms have the same dimensions as the corresponding signals. A need for maintenance is indicated for lime kilns, which are essential parts of the chemical recovery cycle in a pulp mill. These large machines with very slow rotational speeds must run at different production capacities and speeds. The generalised norms provide an efficient indication of faulty situations in the supporting rolls. Surface damage and alignment problems are clearly detected and in the present system also identified with two norms of different order obtained from the signals x(4) . An early indication of friction increase is also achieved. The data set covers the following cases: (1) surface problems, (2) good conditions after grinding, (3) misalignment, (4) stronger misalignment, (5) very good conditions after repair work, and (6) very good conditions one year later. Maintenance was done for one of the supporting rolls. All the rolls can be analysed using the same features throughout the data set. All the faults, friction and minor fluctuations were validated by listening to the recorded acceleration signals and analysing time domain signals and frequency spectra with an oscilloscope and a real time analyser.

关键词： Condition monitoring

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：