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Detection of multiple faults with intelligent condition indices

Detection of multiple faults with intelligent condition indi...

引用

10th International Conference on Condition Monitoring, CM 2013 and Machinery Failure Prevention Technologies 2013, MFPT 2013

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

ISBN: (纸本)9781629939926

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 from generalised norms, which are defined by the order of derivation, the order of the norm and sample time. The nonlinear scaling based on generalised norms and skewness extends the idea of dimensionless indices to nonlinear systems and provides good results for the automatic generation of condition indices. Condition 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. Feature specific health indices, which are calculated as ratios of feature values in the reference condition and the faulty case, are used in selecting efficient features. In the multisensor vibration analysis, the number of sensors and features were drastically reduced. The number of features is further reduced by optimal orders for the derivatives and norms. The complexity of the models is simultaneously reduced. For the supporting rolls of a lime kiln, an efficient indication of faulty situations is achieved with two features. All the rolls can be analysed with 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. Three standard deviations obtained for the signal x (4) on three frequency ranges were needed to detect unbalance and bearing faults. The norms based on the signal x(4) provide the best results in all the frequency ranges.

关键词： Condition monitoring

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Particle Swarm Optimization for multivariable PID controller tuning

Particle Swarm Optimization for multivariable PID controller...

引用

International Colloquium on Signal Processing & Its Applications, CSPA

作者： N A Selamat N. A. Wahab S Sahlan Department of Control and Mechatronics Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Malaysia

In this paper, the tuning of multivariable PID (MPID) controller using particle swarm optimisation (PSO) is presented. To provide better performance in the industry, MPID implementation often uses heuristic approach, which is based on experience. However, this method of tuning is time consuming and inadequate for complex systems. To obtain a better performance in decoupling capabilities and closed loop performance, in this study, the MPID parameters are fine-tuned using Multi-objective PSO. Simulation results show tuning parameters of MPID controllers obtained via PSO yield better performance when applied to nonlinear system for different control strategies.

关键词： Tuning MIMO Particle swarm optimization Optimization Sludge treatment Mathematical model Equations

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Vehicle to infrastructure based safe trajectory planning for Autonomous Intersection Management

Vehicle to infrastructure based safe trajectory planning for...

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International Conference on ITS Telecommunications (ITST)

作者： Chairit Wuthishuwong Ansgar Traechtler Control Engineering and Mechatronics Department University Paderborn Fürstenallee Paderborn Germany

The development of Autonomous Vehicle or Self-Driving car integrates with the wireless communication technology which would be a big step for road transportation today. The autonomous crossing of an intersection with the autonomous vehicle will play a major role in the future of Intelligent Transportation System (ITS). The fundamental objective of this work is to manage autonomous vehicles crossing an intersection with no collisions; as well as maintaining that the car drives continuously, or to decrease the waiting time at the intersection. In this paper, a discrete model of an intersection is designed. The Vehicle to Infrastructure (V2I) communication is implemented to exchange information between a car and intersection manager. The safe trajectory of autonomous vehicles for the Autonomous Intersection Management is determined and presented using discrete mathematics.

关键词： Vehicles Trajectory Mobile robots Indexes Timing Wireless communication Protocols

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Electric charge tomography imaging using finite-element method and Pro-rata distribution

Electric charge tomography imaging using finite-element meth...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： I. T. Thuku M. F. Rahmat T. Tajdari Control and Mechatronics Engineering Department Universiti Teknologi Malaysia Johor Bahru Malaysia

Tomography is a cross-sectional distribution of materials in some region of interest such as cross-section of a pipeline. The technology is widely applied in order to optimize the production efficiencies in process industries that uses pipeline for conveyance. In this paper the elements' and coordinates interpolation techniques of the finite-element method; Cartesian coordinate system, Gauss and Coulombs electrostatic laws were applied to model the system equation with sixteen electrodynamic sensors. However, Matlab program was designed to structurally mesh cross-section of the conveying pipeline into triangular elements which serves as the image pixels. From the modeled system equation, charge spatial sensitivity map for the problem domain was made. The sensitivity matrix obtained, was used to reconstruct the tomography image of the moving particles using Filtered Back Projection and Pro-rata distribution concepts. The combination of the filtered back projection and Pro-rata distribution concepts introduced in the paper, gave a good tomographic image that shows the concentration profile of moving particles through pipeline.

关键词： Sensors Tomography Mathematical model Pipelines Sensitivity Finite element analysis Electrostatics

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On-machine measurement and characterization of V-groove structure pattern on precision rollers

On-machine measurement and characterization of V-groove stru...

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Asia Pacific Conference on Optics Manufacture 2012, APCOM 2012

作者： Cheung, Chi Fai Ren, Ming Jun Li, Da Kong, Ling Bao To, Suet Li, Jibin Partner State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems Engineering Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong College of Mechatronics and Control Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9783037856918

Rolling imprint lithography is an enabling technique for the mass production of ultra-precision micro-structured surfaces which are widely used in high value added optical products such as backlight guides for display devices. The accuracy of the produced micro-structured surfaces relies heavily on the master roller of which quality is difficult to be controlled by traditional off-line measurement process due to the large dimension and heavy weight of the workpiece. This paper presents a CCD based non-contact measurement system to perform the on-machine measurement of the structure pattern on machined rollers. Instead of measuring each single structure on the roller, the system is more focused on the characterization of the conformance of the structure pattern with the designer's requirement. Low angle monochromatic light is used to extract the structure pattern on the machined roller using a high magnification objective lens with a high resolution CCD sensor. The image processing techniques are then employed to characterize the captured image based on the designed pattern structure. The developed system has been mounted on a single-point diamond turning machine to measure the machined structured roller, and the results indicate that the developed measurement system is able to perform the on-machine measurement and characterization of the structure pattern of the machined roller with sub-micrometre accuracy. © (2013) Trans Tech Publications, Switzerland.

关键词： Optical data processing

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control of intelligent cane robot considering usage of ordinary cane

Control of intelligent cane robot considering usage of ordin...

引用

22nd IEEE International Symposium on Robot and Human Interactive Communication: "Living Together, Enjoying Together, and Working Together with Robots!", IEEE RO-MAN 2013

作者： Nakagawa, Shotaro Pei, D. Huang, Jian Sekiyama, Kosuke Fukuda, Toshio Department of Mechanical and Aerospace Engineering Nagoya University 464-0814 Aichi Nagoya Japan Department of Micro-Nano Systems Engineering Nagoya University 464-0814 Aichi Nagoya Japan Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Department of Mechatronics Engineering Meijo University 468-8503 Aichi Nagoya Japan

ISBN: (纸本)9781479905072

Intelligent cane is a robot developed for assisting the elderly or handicapped people in walking. As a nursing-care device, the cane robot is designed to assist the elderly or handicapped people not only in indoor environments but also in outdoor environments. Therefore the cane robot is required to be smaller and lighter. In addition, it is preferred that the cane robot is movable in omni-directions so that it can be used in various situations. A concept called 'intentional direction (ITD)' was proposed to estimate the user's walking intention by analyzing signals from a 6-axis force/torque sensor fixed to the handle of the aluminum stick. Admittance control method was applied to the motion control of the cane robot. In this paper, a new algorithm based on the usage and purpose of an ordinary cane is proposed. In the proposed algorithm, the cane robot is appropriately stopped to support the elderly more effectively. The effectiveness of the proposed method is verified through the experiments. © 2013 IEEE.

关键词： Intelligent robots

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Sliding Mode control with Switching-Gain Adaptation Based-Disturbance Observer Applied to an Electro-hydraulic Actuator System

Sliding Mode Control with Switching-Gain Adaptation Based-Di...

引用

IEEE Conference on Industrial Electronics and Applications

作者： Zulfatman Has Mohd. Fua'ad Rahmat Abdul Rashid Husain Rozaimi Ghazali Department of Control and Mechatronics Engineering Faculty of Electrical Eng. Universiti Teknologi Malaysia

ISBN: (纸本)9781467363204

This paper presents a new robust control scheme using sliding mode control associated with disturbance observer enhanced by varying boundary layers technique. Switching-gain of the sliding mode is adaptable on the estimated disturbance. The scheme is developed to guarantee tracking accuracy of an electro-hydraulic actuator system with robust and smooth control actions in the existence of uncertainties and the changes of external load disturbance. Robustness and smoothness of the control actions is assured if the switching gain of the control law is greater and adaptable on the bounds of the uncertainties and the disturbance. Moreover, the smoothness of the control input is enhanced by varying boundary layers technique based on the estimated disturbance. The capability of the proposed controller is validated through simulation. The simulation results indicate that the proposed scheme ensures the tracking performance with smooth control actions in different levels of the external load disturbance. This scheme offers a significant efficiency of energy in the control of EHA systems.

关键词： Electro-hydraulic Sliding mode Switching-gain Disturbance observer Varying boundary

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A new error handling algorithm for controller area network in networked control system

A new error handling algorithm for controller area network i...

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作者： Shah, M.B. Nor Husain, A.R. Punnekkat, S. Dobrin, R.S. Faculty of Engineering Technology Universiti Teknikal Malaysia Melaka Malaysia Universiti Teknologi Malaysia Control and Mechatronics Engineering Department Faculty of Electrical Engineering 81310 Skudai Johor Malaysia Mälardalen Real-Time Research Centre Mälardalen University Västerås Sweden

An effective error handling mechanism plays an important role to ensure the reliability and robustness of the application of controller area network (CAN) in controlling dynamic systems. This paper addresses a new online error handling approach or named per-sample-error-counting (PSeC) technique that tends to replace native error handling protocol in controller area network (CAN). The mechanism is designed to manage transmission errors of both sensor and control data in networked control system (NCS) used in controlling dynamic system such that the stability of the feedback system is preserved. A new parameter denoted as maximum allowable number of error burst (MAEB) is introduced in which MAEB is selected based on available bandwidth of the CAN network. MAEB serves as the maximum number of attempt of re-transmission of erroneous data per sample which allows the maximum transmission period to be known and guaranteed for time-critical control system. The efficacy of the proposed method is verified by applying the algorithm on the fourth order inverted pendulum system simulated on Matlab/Truetime simulator and the performance is benchmarked with the existing CAN error management protocol. The simulation run under various systems conditions demonstrate that the proposed method results in superior system performance in handling data transmission error as well as meeting control system requirement. © 2013 Elsevier B.V.

关键词： Networked control systems

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Results on Frequency Weighted Model Reduction Techniques of Activated Sludge Process

Results on Frequency Weighted Model Reduction Techniques of ...

引用

International Conference on Computer Modeling and Simulation, UKSIM

作者： Shafishuhaza Sahlan Norhaliza Abdul Wahab Intan Zaurah Mat Darus Control and Mechatronics Engineering Department Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Malaysia Department of Dynamic Systems and Control FaculFaculty of Mechanical Engineering Universiti Teknologi Malaysia Johor Malaysia

ISBN: (纸本)9781467364211

In this paper, a 90th order activated sludge process system is explored. From the original high order system, a disturbance between 1rad/s to 10rad/s are observed, hence frequency weighted model reduction techniques (FWMRT) are applied with a low pass filter of break frequency 0.5rad/s. Three well-known techniques are utilized and compared to the original system on a sigma plot. The reduction techniques are Enn's, Wang et al's and Lin and Chiu's. Results show that the fourth order reduction yields good results whereby all techniques follow the original well, i.e. the characteristics performance of the original system is retained. Although Wang et al follow the original system very closely, Enn's technique is able to smooth out the disturbance and give good error approximation.

关键词： Reduced order systems Sludge treatment Mathematical model Equations Frequency control Biology Wastewater treatment

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On the Linear Active Rejection control of Thomson's Jumping Ring

On the Linear Active Rejection Control of Thomson's Jumping ...

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American control Conference

作者： M. Ramirez-Neria J. L. Garcia-Antonio H. Sira-Ramirez M. Velasco-Villa R. Castro-Linares Automatic Control Dept. Cinvestav-IPN Mechatronics Section of the Electrical Engineering Department of Cinvestav-IPN

ISBN: (纸本)9781479901777

The problem of tracking a smooth time-varying reference trajectory for Thomson's ring is addressed from the perspective of Active Disturbance Rejection control (ADRC). The tracking controller is designed on the basis of the tangent linearization model of the nonlinear system around a constant equilibrium point. The large height deviations, outside the region of validity of the approximate linearization, trigger the effect of unknown nonlinearities and exogenous perturbations. These disturbances are properly on-line estimated and canceled with the help of a linear extended observer-linear controller based output feedback control scheme. Experimental results are presented which validate the effectiveness of the proposed control scheme.

关键词： Output Feedback control Nonlinear systems Linearization Ring device rings Jumping Annulus Perspective tracking controller Rejection (Psychology)

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