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Multi-criteria optimisation design of shapers with piece-wise equally distributed time-delay

IFAC-PapersOnLine 2016年第10期49卷 112-117页

作者： Pilbauer, Dan Michiels, Wim Vyhlidal, Tomas CIIRC - Czech Institute of Informatics Robotics and Cybernetics and Dept. of Instrumentation and Control Eng. Faculty of Mechanical Engineering Czech Technical University in Prague Technická 4 166 07 Praha 6 Czech Republic Department of Computer Science Katholieke Universiteit Leuven Celestijnenlaan 200A HeverleeB-3001 Belgium

The paper presents an optimisation based method to parametrize input shapers with time delays of piece-wise-equal distribution. The design respects the two key requirements on the shaper performance that are the prompt response time and the robustness represented by residual vibration functions, which are however conflicting criteria as a rule. Thus, the optimisation task is solved as a constrained multi-objective problem where the constraints respect the additional requirements on the shaper performance such as a non-decreasing step response or zero residual function at some frequency points. The result is a Pareto front that shows a trade-off between the two main requirements. Next to the presentation of the results in an example, a user friendly shaper-design tool is presented. © 2016

关键词： Multiobjective optimization Computer control systems Constrained optimization Economic and social effects Time delay Timing circuits Distributed time delays Multi criteria optimisation Multi objective problem Pareto frontiers Residual functions Residual vibrations Signal shaper Vibration suppression

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The method of frequency determination of impulse response components based on cross-correlation vs. fast Fourier transform

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Diagnostyka 2016年第1期17卷 59-64页

作者： Kotowski, Adam Faculty of Mechanical Engineering Department of Automatic Control and Robotics Bialystok University of Technology ul. Wiejska 45C Bialystok15-351 Poland

The paper presents results of impulse response spectral analysis that has been obtained using a method based on cross-correlation. The impulse response spectrum is achieved by correlating the impulse response and reference single-harmonic signals and using Hilbert transform to obtain an envelope of cross-correlation. Then, surface area under the envelope is calculating and its plot in frequency domain is making. The spectrum obtained this way has its advantage over the fast Fourier transform (FFT) that its spectral resolution does not depend on length of impulse response. At the same time, the spectral resolution can be much greater than spectral resolution resultant from FFT. Obtained results show that presented method gives possibilities to determine frequencies of impulse response components more accurate in comparison to FFT particularly for short-time impulse responses.

关键词： Impulse response

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Multiple solutions and corresponding power output of nonlinear piezoelectric energy harvester

Multiple solutions and corresponding power output of nonline...

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International Conference on Dynamical Systems: Theory and Applications, DSTA 2015

作者： Syta, Arkadiusz Litak, Grzegorz Friswell, Michael I. Borowiec, Marek Faculty of Mechanical Engineering Lublin University of Technology Nadbystrzycka 36 Lublin20-618 Poland Department of Process Control AGH University of Science and Technology Mickiewicza 30 Cracow30-059 Poland College of Engineering Swansea University Bay Campus Fabian Way Crymlyn Burrows SwanseaSA1 8EN United Kingdom

ISBN: (纸本)9783319424071

Energy harvesting is used for an increasing number of small electronic devices and sensors in various applications. Ambient sources of vibration are exploited to provide low levels of power to devices where battery replacement is difficult. One of the simplest concepts for energy harvesting from mechanical vibrations is based on a linear mechanical resonator combined with a piezoelectric transducer. In this case, mechanical energy scavenged from mechanical stress or strain is transferred to electrical voltage. However, such devices work most efficiently in the vicinity of a resonant frequency and it is difficult to tune them in the presence of variable ambient conditions. On the other hand, nonlinear devices seem to be more effective in such conditions due to the broader frequency spectrum of their response. In this paper, we analyse the dynamics of a nonlinear flexible beam with a piezoelectric layer and a magnetic tip mass under the harmonic excitation. The additional magnets define system multistability, including a tristable configuration. The resonant curves and basins of attraction are predicted and can be helpful in choosing the optimal values of the system parameters. © Springer International Publishing Switzerland 2016.

关键词： Energy harvesting

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Cooper pairs in a two-orbital superconductor: bands filling effect on pair sizes

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Journal of Physics: Conference Series 2017年第1期833卷

作者： Grzegorz Litak Teet Örd Küllike Rägo Artjom Vargunin Lublin University of Technology Faculty of Mechanical Engineering Nadbystrzycka 36 PL-20618 Lublin Poland AGH University of Science and Technology Department of Process Control Mickiewicza 30 PL-30-059 Krakow Poland Institute of Physics University of Tartu W. Ostwaldi Str. 1 50411 Tartu Estonia Department of Theoretical Physics The Royal Institute of Technology Stockholm SE-10691 Sweden

The two-orbital superconducting state is modeled by on-site intra-orbital negative-U Hubbard correlations together with inter-orbital pair-transfer interactions. The influence of bands filling on the temperature dependencies of the sizes of Cooper pairs in different orbitals is analyzed. It is found that the sizes exhibit unconventionally strong variation in the temperature scale for occupations favouring interband proximity effect.

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Application of Computer Aided Tools and Methods for Unmanned Cargo Aircraft Design

Application of Computer Aided Tools and Methods for Unmanned...

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International Conference on Methods and Models in Automation and robotics

作者： Roman Czyba Michal Hecel Karol Jabloński Marcin Lemanowicz Krzysztof Platek Department of Automatic Control Faculty of Automatic Control Electronics and Computer Science Department of Chemical Engineering and Process Design Faculty of Chemistry Faculty of Mechanical Engineering Silesian University of Technology 16 Akademicka St. Gliwice 44-100 Poland

ISBN: (纸本)9781479987023

Nowadays, novel construction materials, more efficient power supplies and advanced artificial intelligence algorithms allow one to use unmanned aerial vehicles (UAV) in various fields of life. One of the biggest events promoting this idea is the Air Cargo Challenge (ACC) competition. In this paper the motivation for ACC participation and the overall procedure of CAD aided UAV design are presented. The nonlinear aircraft model as well as Computational Fluid Dynamic simulations are discussed. Finally, some details concerning designed UAV prototype are revealed.

关键词： UAV CAD CFD Rapid Prototyping

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Characteristics of the flow control valve with MSMA actuator

Characteristics of the flow control valve with MSMA actuator

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15th International Carpathian control Conference, ICCC 2014

作者： Ireneusz, Dominik Stanislaw, Flaga AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Process Control Krakow Poland

ISBN: (纸本)9781479935284

In the article the laboratory research on a flow control valve driven by electromechanical transducer made of a magnetic shape memory alloy (MSMA) is presented. It is a new group of materials which allows generating linear movement and force. The MSMA materials change their shape under a magnetic field influence. The researched valve is a prototype enabling to determine an operating limit of an electromechanical transducer working under pneumatic load. The experimental research of the control flow valve was carried out and the PID controller was proposed to control flow rate in a pneumatic system control. © 2014 IEEE.

关键词： Shape memory effect

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Dynamic and control analysis of a smart rotor by combining the ansys and matlab software

Dynamic and control analysis of a smart rotor by combining t...

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作者： Cupial, Piotr Koziol, Mateusz Department of Process Control Faculty of Mechanical Engineering and Robotics AGH University of Science and Technology Krakow Poland

This text describes the development of an efficient approach to the analysis of the dynamics of a rotor with a structure that contains active elements. Since the Ansys software, according to our experience, has limitations in the area of rotor dynamics and due to the fact that the use of control algorithms is difficult to implement in Ansys, a new analysis approach to the study of smart rotors has been created and verified. After the generation of the geometry and building the model in Ansys, the finite-element model matrices are imported into Matlab. The space state model is created next so that the reliable control software available in Matlab can be used. The verification of this analysis method has been done by comparison with the results obtained using an analytical model of a smart Jeffcott rotor with and without control. © JVE INTERNATIONAL LTD.

关键词： Finite element method

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A study on tracking peformance of the pneumatic system with enhanced NPID controller

A study on tracking peformance of the pneumatic system with ...

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Asian control Conference

作者： Sy Najib Sy Salim Aliza Che Amran A. A. M. Faudzi Z. H. Ismail M. F. Rahmat N. H. Sunar Shamsul Anuar Shamsudin Department of Control Instrumentation and Automation Faculty of Electrical Engineering Universiti Teknikal Malaysia Melaka Department of Control Universiti Teknikal Malaysia Melaka Department of Control and Mechatronic Engineering Universiti Teknologi Malaysia Centre for Artificial Intelligence & Robotics (CAIRO) Universiti Teknologi Malaysia Kuala Lumpur Malaysia Faculty of Mechanical Engineering Universiti Teknikal Malaysia Melaka

An investigation on the performance of enhanced Nonlinear Proportional Integral Derivative (ENPID) controller is presented in this paper. The study is focused on the potential of the controller to perform well in tracking set point of pneumatic actuator system. Two control strategies of the ENPID are considered in this paper, namely Multi-rate NPID (MN-PID) and Self-regulation NPID (SN-PID). These control strategies are tested against NPID and conventional PID controller. Also, the dead-zone compensation (DZC) is applied to the system to overcome the dead-band of the valve. Feed forward path is also included to improve the tracking performance. Two different input signals i.e. sinusoidal and S-curve waveforms are used to evaluate the performance of the techniques. To further examine the controller performance, the frequency and amplitude of the sinusoidal test signal are varied. The effectiveness of the proposed controllers is verified through simulation and experimental studies.

关键词： Pneumatic actuators Valves Mathematical model Trajectory Pistons Fuzzy logic

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Target Costing Calculation and Economic Gain for Companies

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Procedia Economics and Finance 2015年 23卷 1195-1200页

作者： Jaroslava Kádárová Katarína Teplická Michaela Durkáčová Marek Vida Technical University of Košice Faculty of Mechanical Engineering Department of Industrial Engineering and Management Letná 9 042 00 Košice Slovakia Technical University of Košice Faculty of mining ecology process control and geotechnologie Department of Business and Management Park Komenského 19 042 00 Košice Slovakia Zeocem a. s. 094 34 Bystré 282 Slovakia

This paper deals about the problematic of target costing implementation into the managerial decisions. These decisions make value analysis principles for increasing in competitiveness by the setting off limits for maximum allowable costs which should not exceeded by company manufacturing. By this approach is possible to improve product quality, service, shortening the research and development period and continual effort to lower costs. Target costing as a modern method of calculation uses the principles of value analysis, by using instruments of functional cost analysis and quantitative-function deployment can provide a functional differentiation of the product. This approach has a high importance for quality assurance in pre-production phase and it's increasing. Application of target costing is growing in praxis still. Target costing calculation introduce system approach to quantify costs of product in the phase of constructive and development activities of production. Comparison target costing calculation and traditional calculation show target gap. Target costing calculation is new modern instrument that it facilitates to manage price of product by the customers’ requirements. The price is determined by market and customer's needs. In this phase is possible to fix costs of product. In praxis we often meet with situation where the price of product is very high and customer is not ready to pay so much. Target costing calculation limits cost of production.

关键词： Cost target costing value analysis price quality of product.

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Identification of Suspension Bridge Parameters under Exploitational Conditions

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Journal of Mechanics engineering and Automation 2014年第8期4卷 657-666页

作者： Joanna Iwaniec Marek Iwaniec Department of Robotics and Mechatronics Faculty of Mechanical Engineering and Robotics AGH University of Science andTechnology Krakow 30-059 Poland Department of Process Control Faculty of Mechanical Engineering and Robotics AGH University of Science and TechnologyKrakow 30-059 Poland

The paper concerns a research into dynamic properties of the steel suspension bridge across Opolska Street in Krakow, Poland. Parameter identification was carried out with the application of the nonlinear system identification method on the basis of system responses to exploitational excitation resulting from pedestrian traffic. In order to verify obtained results, on the basis of the geometrical and material properties of the considered system, the FEM （finite elements model） was created. Created FEM model was updated through the comparison with the model determined by the use of experimental modal analysis method and then applied to analytical evaluation of the considered suspension bridge natural frequencies.

关键词： Steel bridge nonlinear system identification exploitational excitation

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