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Advanced condition monitoring of epicyclic gearboxes

Advanced condition monitoring of epicyclic gearboxes

引用

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

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

ISBN: (纸本)9781629939926

Epicyclic gearing or planetary gearing is a gear system that consists of one or more outer gears, or planet gears, revolving around a central, or sun gear. Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear. The complex structure consisting of many rolling elements and versatile components results in a long stoppage if a failure occurs. Therefore, it is important to detect incipient faults at an early stage. In this paper, vibration analysis is used for the condition monitoring of an epicyclic gearbox at a water power station. Because of the quite high rotational speed of the output, acceleration and its higher order derivatives should be used in order to obtain good responsiveness to changes in the conditions. Complex models based on mechanisms are needed in order to calculate the vibration components in the frequency range and to identify the possible faulty components. There was also one vibration component in the gear the source of which could not be discovered with certainty. A combined signal processing and feature extraction approach based on generalised moments and norms provides efficient indicators for condition monitoring. The features defined by the order of derivation, the order of the norm and the sample time are used in dimensionless indices, which are calculated by dividing the feature value with a reference value corresponding to the normal operation. The indices are calculated for different real order derivatives and weighted lp norms to form S-surfaces, which are used in selecting suitable orders.

关键词： Condition monitoring

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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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Increasing intelligent systems' reliability by using reconfiguration

Increasing intelligent systems' reliability by using reconfi...

引用

Annual Symposium on Reliability and Maintainability (RAMS)

作者： Tobias Meyer Jan Henning Keßler Walter Sextro Ansgar Trächtler Mechatronics and Dynamics University of Paderborn Paderborn Germany Heinz Nixdorf Institute Control Engineering and Mechatronics University of Paderborn Paderborn Germany

Self-optimizing mechatronic systems allow the adaptation of the system's behavior to the current situation. This can be used to actively adapt the behavior to the current degradation state of the system or of some... 详细信息

关键词： Actuators Optimization Valves mechatronics Suspensions Degradation Mathematical model

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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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Effects of influencing factors on friction coefficient in microsheet forming

Effects of influencing factors on friction coefficient in mi...

引用

作者： Gong, F. Guo, B. College of Mechatronics and Control Engineering Shenzhen University Shenzhen 518060 China Key Laboratory of Advanced Manufacturing Technology for Mold and Die Shenzhen University Shenzhen 518060 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

The influence of friction on microforming increased dramatically than macroforming with the miniature of the forming parts. The factors which have great impact on friction coefficient in microsheet forming were studied in this paper by strip drawing test. The specimen material was copper C1100, which was thermally treated at 600°C for 12 h in nitrogen atmosphere. The experiments were carried out at room temperature on a universal testing machine under four kinds of punch roughness, sheet roughness, drawing velocity and lubrication conditions respectively. The results showed that the friction coefficient increased with the increasing punch roughness and sheet roughness, but decreased with the increasing drawing velocity. However, the friction coefficient did not change under different lubrication conditions, which is quite different from macroforming. The reason for this phenomenon was also discussed at the end of this paper. © W. S. Maney & Son Ltd. 2013.

关键词： Friction

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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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Design of fuzzy parallel distributed compensation controller for magnetic levitation system

Design of fuzzy parallel distributed compensation controller...

引用

13th Iranian Conference on Fuzzy Systems, IFSC 2013

作者： Gholami, Milad Aliyari Shoorehdeli, M. Dashti, Zohreh Alzahra Sanai Teshnehlab, M. Department of Electrical Engineering Qazvin Branch Islamic Azad University Qazvin Iran Mechatronics Department Electrical Engineering Faculty K. N. Toosi University Tehran Iran Control Department Electrical Engineering Faculty K. N. Toosi University Tehran Iran

ISBN: (纸本)9781479912285

This study applies technique PDC (parallel distributed compensation) for position control of a Magnetic levitation system. PDC method is based on nonlinear Takagi-Sugeno (T-S) fuzzy model. It is shown that this technique can be successfully used to stabilize any chosen operating point of the system. All derived results are validated by computer simulation of a nonlinear mathematical model of the system. The controllers which introduced have big range for control the system. © 2013 IEEE.

关键词： Position control

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A stator voltage oriented doubly fed induction generator control method with a disturbance observer

A stator voltage oriented doubly fed induction generator con...

引用

Eurocon

作者： E. Emre Özsoy Editi Goluboviç Asif Şabanoviç Metin Gökaşan Control Engineering Istanbul Technical University Maslak Istanbul Turkey Mechatronics Engineering Sabanci University Istanbul Turkey

Due to their robustness and cost effectiveness, double fed induction generator (DFIG) based wind turbines are becoming very popular in wind energy conversion systems. Robustness of any implemented control structure can easily be lost due to nonlinearities, variations in the DFIG parameters and network voltage failures. In this study, machine parameter dependent terms will be estimated with the first order low pass filter disturbance observer, and stator voltage orientation will be applied in the experimental test bed. DSP ACE DS1103 platform is used as a digital controller.

关键词： Computational fluid dynamics

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Speed control of a Digital Servo System using parallel distributed compensation controller and Neural Adaptive controller

Speed control of a Digital Servo System using parallel distr...

引用

13th Iranian Conference on Fuzzy Systems, IFSC 2013

作者： Dashti, Zohreh Alzahra Sanai Jafari, Mohammad Gholami, Milad Aliyari Shoorehdeli, M. Teshnehlab, M. Department of Electrical Engineering Qazvin Branch Islamic Azad University Qazvin Iran Mechatronics Department Electrical Engineering Faculty K. N. Toosi University Tehran Iran Control Department Electrical Engineering Faculty K. N. Toosi University Tehran Iran

ISBN: (纸本)9781479912285

This study applies technique PDC (parallel distributed compensation) for speed control of a Digital Servo System. PDC method is based on nonlinear Takagi-Sugeno (T-S) fuzzy model. Also in this study Neural Adaptive is used for velocity control and identification of a Digital Servo System. It is shown that these techniques can be successfully used to stabilize any chosen operating point of the system. All derived results are validated by experimental and computer simulation. The controllers which introduced have big range for control the system. We compare PDC controller with Neural Adaptive controller results and PID controller. © 2013 IEEE.

关键词： Servomechanisms

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Implementation of Multi Robot Communication via Bluetooth

Implementation of Multi Robot Communication via Bluetooth

引用

16th FIRA RoboWorld Congress, FIRA 2013

作者： Mahmood, Mohd.Muhaimin Hong, Ober Choo Sui Sanhoury, Ibrahim M.H. Norrazi, M.Azrai M. Amin, Shamsudin H.M. Control and Mechatronics Engineering Dept Universiti Teknologi Malaysia Malaysia Cytron Technologies Sdn Bhd Skudai Johor Malaysia Centre for Artificial Intelligence and Robotics Manufacturing and Materials Research Alliance Universiti Teknologi Malaysia Malaysia

ISBN: (纸本)9783642404085

In multi robot system where two or more robot will be working together to complete a task given, it is fundamental to have a good communication between robots. This paper will discuss communication strategy by providing Personal Area Network (PAN) using Bluetooth method in multi robot area. Bluetooth is a suitable communication between mobile robots because low cost, low power consumption and communication range between 10m to 100m. This network is purpose to able to support real time control. Another advantage is the robot will able to communicate through the wall or obstacle. Bluetooth Protocol Stack and mobile robot control architecture is implemented on a single microcontroller chip. Result from the experiments show that the mobile robot named BlueBot, with programmed microcontroller able to perform a Bluetooth PAN and communicate with each other. One of the objectives of the project is to design and build three autonomous mobile robots which can establish PAN automatically via Bluetooth transceiver for wireless communication (hardware and software). © Springer-Verlag Berlin Heidelberg 2013.

关键词： Bluetooth

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