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Generalised moments and lp norms in vibration analysis

Generalised moments and lp norms in vibration analysis

引用

6th International Conference on Condition Monitoring and Machinery Failure Prevention Technologies 2009

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)9781618390097

The signals x(3) and x(4) are very suitable for the condition monitoring, and real order derivatives x(α) provide additional possibilities. Generalised moments τM αp and their lp norms are defined by the order of derivation (α), the order of the moment (p) and sample time (τ), which all are real numbers. The lp norms have the same dimensions as the corresponding signal. Optimal parameters α, p and τ, have been obtained for a Kaplan water turbine, which was analysed in a wide power range. A short sample time, τ=3 s, and relatively small requirements for the frequency ranges make this approach feasible for on-line analysis and power control. High correlation to the knowledge-based cavitation index is achieved with the relative max( 3 M42.75). In the problematic low power range, absolute average and rms values result in considerably lower R2 values even when α=4, and the corresponding norms with α=3 are inacceptable. The second example is a centrifuge, which has very fast rotating roller bearings. The sensitivities of the norms with different values for the order α, and the order p are compared. The sample time 3.9 ms corresponds to two rotations. A good order of derivation and proper frequency ranges are beneficial for fault detection. The norms based on the signal x(4) provide the best results: good results are already obtained in the frequency range 10-1000 Hz. The absolute mean x(α) av can be used if the order α is proper and the frequency range is sufficient. This is readily suitable for intelligent sensors where a good solution is to use analog signals x(4) and combine peak values x (4)p and absolute averages x(4) av. These methodologies are not limited to vibration analysis.

关键词： Vibration analysis

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Kinematics and its solution methodology of A 3-PRR flexure-based parallel mechanism

Kinematics and its solution methodology of A 3-PRR flexure-b...

引用

IASTED International Conference on Modelling, Simulation, and Identification, MSI 2009

作者： Tian, Y. Shirinzadeh, B. Zhang, D. Fatikow, S. Robotics and Mechatronics Research Laboratory Department of Mechanical and Aerospace Engineering Monash University Clayton VIC 3800 Australia School of Mechanical Engineering Tianjin University Tianjin 300072 China Division of Microrobotics and Control Engineering University of Oldenburg Oldenburg 26111 Germany

ISBN: (纸本)9780889868106

This paper presents the mechanical design and kinematic analysis methodologies of a 3-PRR flexure-based parallel mechanism, which can be utilized to conduct planar precision positioning as required for automating micro/ nano manipulation tasks. Flexure hinges are used as the revolute joints to provide smooth motion in the range of micrometers. Three high performance piezoelectric actuators are utilized to drive the flexure-based mechanism. The kinematics of the proposed flexure-based parallel mechanism is established. Finite element analysis is conducted to validate the performance of the 3-PRR flexure-based parallel mechanism. Two simplified methodologies are proposed to improve the computational efficiency of the kinematics of the developed mechanism.

关键词： Kinematics

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A numerical solution to the ray-shooting problem and its applications in robotic grasping

A numerical solution to the ray-shooting problem and its app...

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： Yu Zheng Chee-Meng Chew Control & Mechatronics Laboratory Department of Mechanical Engineering National University of Singapore Singapore

Based on the distance algorithm by Gilbert et al., this paper presents a numerical algorithm for computing the intersection of the boundary of a compact convex set with a ray emanating from an interior point of the set, which is known as the ray-shooting problem. Affinely independent points on the boundary of the convex set are also determined such that the intersection point can be written as their convex combination. Because of its high efficiency and other good qualities, this algorithm provides superior solutions to three fundamental problems in robotic grasping, i.e., force-closure test, contact force optimization, and grasp quality evaluation, which can be formulated as the ray-shooting problem.

关键词： Robots Robotics and automation Testing Helium Computational geometry Convergence Friction Linear programming

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Automatic adjustment of the transition between local models in a hierarchical structure identification algorithm

Automatic adjustment of the transition between local models ...

引用

European control Conference (ECC)

作者： Benjamin Hartmann Oliver Nelles Automatic Control Mechatronics Department of Mechanical Engineering University of Siegen Siegen Germany

This article addresses the adjustment of overlaps between local models in hierarchical local model networks. A comparison with flat model structures exposes the advantages of the hierarchical approach. The objective is to identify a smooth global model with validity functions that have a local and unimodal interpretation in the input space. The difficulty in achieving appropriate local model overlaps is solved with a new algorithm for automatic transition adjustment. It overcomes the problem that an a-priori smoothness fixation is disadvantageous because of the primary unknown number of hierarchy levels of the identified model. The universal approximation characteristic will get lost if too large overlaps of newly added local models prevent an improvement of the global model. An illustration of this effect is given by a simple demonstration example. Furthermore an example of a practical application is presented with the torque modeling of a combustion engine map.

关键词： Computational modeling Estimation Adaptation models Interpolation Partitioning algorithms Covariance matrices Polynomials

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Measurement of localized deformation of shape memory alloy under fast tensile loading

Measurement of localized deformation of shape memory alloy u...

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International Conference on Experimental Mechanics 2008, ICEM 2008

作者： Feng, Ping Sun, Qing-Ping Yu, Tong-Xi Shenzhen Key Laboratory of Advanced Mould Manufacturing Technology College of Mechatronics and Control Engineering Shenzhen University Shenzhen 518060 China Department of Mechanical Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

The deformation of NiTi shape memory alloy strips and microtubes subjected to uniaxial tensile loading involves formation and growth of high-strain martensite domain(s) of various shapes due to autocatalytic stress-induced phase transformation. Under fast tensile loading with strain rates of 10 -3∼100/s, the number of the domains will increase with the strain rate and the domain morphology becomes very complicated. Measurement of this kind of highly inhomogeneous and localized deformation is a challenging problem. This paper reports the results of our recent experimental advances in solving such problem. It includes: (1) the determination of domain front by direct characterization method, block tracking method, and speckle tracking method;(2) non-contact measurement of global and local strains by flexible video extensometer method. The above methods used in the measurements have been proved to be reliable and suitable for the localized deformation under fast tensile loading conditions. © 2009 SPIE.

关键词： Strain rate

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Design and analysis of a dSPACE-based position control system for a linear switched reluctance motor

Design and analysis of a dSPACE-based position control syste...

引用

International Conference on Power Electronics Systems and Applications (ICPESA)

作者： Guang-zhong Cao Lv-ming Lin Hong Qiu J.F. Pan Department of Automation Science College of Mechatronics and Control Engineering Shenzhen University Shenzhen China

This paper presents a high-precision position control system for a linear switched reluctance motor (LSRM) based on dSPACE real-time control platform. The LSRM has a very simple structure and it can be manufactured easily, and there is no need for magnets. The control system utilizes dSPACE development platform as the controller and generates the real-time code for the control algorithm and motor model, tuning the control parameters online and PD algorithm is implemented. The experiment results indicate that with the control method presented in the paper, the position error is less than 0.04 mm. Also compared with traditional research and development method, using dSPACE real-time control platform is able to quickly complete research and development for this kind of position control system, and the advantages are not only to shorten the entire system development cycle but also ensure system reliability and reduce costs.

关键词： Position control Reluctance motors Real time systems control systems Research and development Manufacturing Magnets control system synthesis Error correction Reliability

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BLAC Drive System for Electro-Magnetic Brake

BLAC Drive System for Electro-Magnetic Brake

引用

2009 IEEE 6th International Power Electronics and Motion control Conference-ECCE Asia

作者： Mi-Rim Jeon Kwan-Yuhl Cho Hag-Wone Kim Jin-Woo Lee Hyung-Soo Mok Department of Electrical Engineering Konkuk University Department of Information and Control Engineering Chungju National University Department of Mechatronics Doowon Technical College

The field of electric braking has focused its attention on braking force obtained by using a motor instead of a hydraulic brake which has been adopted by previous automobile systems. Electric braking is a system which consists of fewer numbers of components than previous hydraulic brakes, and it has effects of improved responsiveness and reduced braking distance for the ABS(Anti-lock Brake System) and the ESC(Electronic Stability control). The purpose of this paper is to develop BLAC motor Drive System for Electro-Magnetic Brake(EMB). In order to achieve the purpose, this paper shows a control system constituted by a power converter system which drives a motor and a digital control system which controls the speed, and it suggests a vector control strategy for a fast torque response. Furthermore, this paper applies the control technique and verifies the performance of BLAC motor drive system for EMB while providing the result of experiment as well as simulation by Matlab/Simulink.

关键词： EMB BLAC Drive System for Electro-Magnetic Brake System

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On the Smoothness in Local Model Networks

On the Smoothness in Local Model Networks

引用

2009 American control Conference (ACC 2009)

作者： Benjamin Hartmann Oliver Nelles Automatic Control Mechatronics Department of Mechanical Engineering University of Siegen D-57068 Siegen Germany

ISBN: (纸本)9781424445233

This paper compares flat and hierarchical model structures in local model networks and discusses the side effects of normalization. A new algorithm for automatic transition adjustment between local models avoids undesirable effects that occur with the hierarchical approach and leads to a suitable model structure with better interpretability of local models. Demonstration examples illustrate the advantages over the existing approaches.

关键词： Smoothness Model structures Local Area Networks undesirable effects hierarchical models Side Effect Network interpretability

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SUpervised HIerarchical CLUSTering (SUHICLUST) for nonlinear system identification

SUpervised HIerarchical CLUSTering (SUHICLUST) for nonlinear...

引用

IEEE Symposium on Computational Intelligence in control and Automation, CICA

作者： Benjamin Hartmann Oliver Nelles Igor Skrjanc Anton Sodja Automatic Control Mechatronics Department of Electrical Engineering University of Siegen Siegen Germany Department of Electrical Engineering University of Ljubljana Ljubljana Slovenia

In this paper the new algorithm SUHICLUST (supervised hierarchical clustering) is presented. It unifies the strengths of the supervised, incremental construction scheme LOLIMOT with the advantages of product space clustering. The result of this fusion is a powerful structure identification algorithm that enables approximation of processes with axes-oblique partitioning, high flexible validity functions and local polynomial models. The theoretical comparison with LOLIMOT and product space clustering and a demonstration example underline the usefulness of SUHICLUST.

关键词： Nonlinear systems Clustering algorithms Partitioning algorithms Heuristic algorithms Supervised learning Unsupervised learning Interpolation Fuzzy logic Automatic control mechatronics

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Test on acoustic resonance characteristic of PTFE micro/nano-aperture membrane for nanobiomedical application

Test on acoustic resonance characteristic of PTFE micro/nano...

引用

2009 IEEE 3rd International Conference on Nano/Molecular Medicine and engineering, NANOMED 2009

作者： Lin, Wanfeng Lou, Wenzhong Li, Xin 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

ISBN: (纸本)9781424455287

This study investigate the potential biomedical application of micro/nano-aperture membrane fabricated with Polytetrafluoroethylene (PTFE). Experimental work is carried out to examine the membrane's sound transmission /absorption characteristics under the condition of different aperture diameter, thickness and cavity depth of tube. It is discovered that when there is no air layer besides the tested membrane, sound transmission is not affected. When there is sound layer, it is resonant sound absorption. In the frequency range of 100-1500Hz, it is low frequency high rate sound transmission zone. In the frequency range of 1500Hz-6300Hz, it is high frequency resonant sound absorption. It is found that PTFE as a fine sound transmission material as well as a fine sound absorption material. The original test provides a solid evidence for further research and modeling of sound transmission theory. © 2009 IEEE.

关键词： Membranes

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