The paper deals with the methodology of the determination of the weighting coefficients for differential quadrature method based on spline interpolation. Appropriate formulas are derived and two practical approaches to determine mentioned coefficients are proposed, one – pure numeric, the other that uses symbolic-numeric programming. Both approaches are analyzed on account of efficiency, conditioning of the problem and easiness of the implementation.

One of the main weaknesses in the Laboratory of Distributed Control Systems at the AGH University of Science and Technology in Krakow was students’ knowledge about connecting peripheral devices to industrial computers known also as PLCs. After participating in PLC laboratory course students were able to create advanced programs, control complicated mechatronic systems but they could not assemble even simple electrical circuits. It results from the fact that they worked on ready-made laboratory stands where all the electrical connections had already been set. The paper presents the building of eight laboratory stands for learning how to connect PLC inputs and outputs as the first step before proper programming.

The paper deals with the speed up of a computer program, which simulates rolling of steel with semi-solid zone. The mathematical models describing the rolling process are fully three dimensional. It leads to very long computation time while the discretization of the problem is made in finite element manner. The main objectives of the contribution are optimization of the program code, as well as making of the first look at possibilities of parallel computation in application to the presented problem. The paper has proved that efficient optimization of the program code can lead to significant shortening of the computation time also with the automatic and manual parallelization. It was concluded that adaptation of the procedures and loops to rigorous requirements of the parallel compiler is strongly recommended.

In the paper an analysis of gripping thin metal sheets in technological process of stamping metal closures is presented. An object made of two suction cups and pneumatic control system of vacuum and pressure inside the suction cup was analyzed. Mathematical model contains differential equations which were solved basing on Matlab/Simulink application. Prepared model provides an opportunity to check different parameters of the system. The paper presents analysis of impact of feed pressure on the course of sucking forces.

In the paper an analysis and investigation of round metal sheet sharing force and crown cork drawing force are presented. Experimental test stand was created in order to perform analysis on sharing and drawing forces for several metal sheet thicknesses. Obtained results are sufficient for comparison of acting forces for different metal sheet thicknesses and hardness during cutting process.

The paper presents the effect of air suspension system on semi-trailers during loading and unloading processes while using a forklift. The mathematical model was created, which takes into account a sharp loading on the rear platform of a semi-trailer. The entry of a loaded forklift onto the rear platform of a semi-trailer causes rapid lowering of the platform, which contributes to an unstable movement of the forklift.

This paper presents a methodology to increase performance of the kinematics simulation process of heavy machinery equipment system. The proposed method is based on parallelization of calculations performed in a single simulation step. Parallelization is achieved by building application based on the OpenCL framework that allows to perform the necessary mathematical calculations using a graphics card processor. In the final part of the article were presented results of performance tests of the proposed method.

This paper presents the results of simulations of vane pump static characteristics with a fuzzy controller. The controller was designed for controlling the flow rate of the vane pump. The results confirm, that the control quality is slightly better than with the PID controller, especially at low loads and rapid changes of the system load.

This paper presents simulation of cavitation phenomena at jet pumps with use of CFD methods. There was also presented theoretical consideration of cavitation formation and models applied at the CFD codes. On example of liquid-jet liquid pump, which working medium is water was presented simulation of cavitation process which was conducted in Ansys CFX code. This paper also includes some selected results of simulation for fluid flow at the jet pump with consideration of cavitation process.

Applications of dielectric elastomer (DE) actuators are presented in this paper. Dielectric elastomers (a type of electroactive polymer) are one the most promising smart materials. They consist of two flexible electrodes and a dielectric film between them. After applying voltage (3–5 kV) to the electrodes, the thickness of the polymer layer lowers. Changes of the thickness can be indirectly measured , enabling the element to work as a sensor. A self-sensing and energy harvesting elements are also described. Two applications are described – an active orthosis and a force feedback device.

The aim of this paper is the presentation of the method for thermal conductivity measurement and numerical modeling of temperature distribution in apparatus for measuring the thermal conductivity. Experimental studies will be carried out in transient state until the steady state heat conduction in apparatus is achieved. The calculated and measured temperature distribution will be compared. The time to steady state in apparatus for different samples will be estimated based on numerical and experimental results. The influence of the contact resistance between the sample and the measuring device will be analyzed.

The paper presents the characteristics of planning actions on the stage of conceptual and detailed manufacturing process planning in an integrated PLM environment. The functionality of the available solutions is discussed in details. Based on these analysis, the directions for the future development of the machining process planning systems to increase the automation level are presented.

The studies of the Biomedical Engineering faculty combine technical and humanistic elements. The biomedical engineering itself is a combination of knowledge located at the intersection of engineering, medical and biological applications. Technical universities which offer training courses on Biomedical Engineering place greater emphasis on engineering education. It is apparent, however, that the majority of students of this course are graduates of high schools with humanistic knowledge and no technical preparation. Initial teaching of technical subjects must therefore be conducted in a language and format accessible to the “non-engineers”. Particularly, it is important to demonstrate and teach students the tools that will facilitate their further education.

This paper presents Failure Mode and Effects Analysis using relations diagrams and matrices similarity method application on the hydraulic cylinder. Functions for each hydraulic cylinder components were identified as well as a pairs for interacting components. Also potential failures were defined. Using the principle of matrices similarity the rank of hydraulic component due to performed functions has been prepared.

This paper presents a proposal of computer system to support the work of local LNG supply station. The main advantages of proposed system are to increase safety and reduce the operating costs of the station. On the basis of preliminary analysis the main functional modules of the system have been distinguished. The modules include: vaporization control unit, subsystem for monitoring parameters in the cryogenic tank and installation, central database server, data visualization module, diagnostic subsystem and module for LNG supplies optimization. The system has been used for investigating a real supply station.

This paper presents examples of usage of Coordinate Measuring Machine simulator, which facilitate metrological tasks in laboratory and industrial conditions, and constitute a great convenience in Coordinate Measuring Technique learning process.

In the Institute of Production Engineering of Cracow University of Technology carried out research in the field: design manual and robotic manufacturing systems. The paper presents computer aided modeling assembly process plan with using programs: CAD/CAM Catia v5, MS Visio 2010, MS Excel 2010). The assembly process plan is illustrated in the example of dual stage regulator.

This paper presents database of technological capability manufacturing system oriented for machines kinematics. This database is a part of CAPP (Computer Aided Process Planning) prototype system, which was built on the basis of algorithm generating multi-variant process plan. Database was implemented to Microsoft Access 2010.

In this paper the digital image analysis of voids formed during the deformation of steel samples in the GLEEBLEE 3800 physical simulator device with the semi-solid core. The presented and characterized indicators describe the shape of voids, and their relative position as qualifiers quality indicators as well as the correlation between the indicators and possible defects in the material. The paper contains the results and discussion of presented analysis.

The paper presents the formal method of recording the alternatives of machining process plan. This method based on levels distinguished in hierarchical structure of process, where alternatives can be created. The algorithm for linking intermediate states of workpiece was developed. It enables to change series of linear processes into one network of alternative plans in the form of non-cyclic graph.

The UL-39 ultra-light aircraft which is being developed by the Department of Aerospace Engineering, Faculty of Mechanical Engineering, Czech Technical University in Prague, is equipped with an unconventional ducted fan propulsion unit. This paper deals with identifying noise sources of this propulsion unit and easily applicable ways of predicting its noise level. At the end, a few potential noise-suppressing design improvements are presented.

The paper presents example results leading to develop multiscale 3D methodology of mechanical properties prediction for steel deformed in the temperature range close to solidus line. Conducted experiments and simulations confirms the need to seek new methods to obtain precise characteristics in the context of detailed computer simulations.

The paper presents the application of the Finite Element Method (FEM) in the analysis of the stress state in artificial hip prosthesis. A virtual model of hip prosthesis was made using computer aided design systems (CAD). A better construction of this component was developed in combination with numerical analysis. Virtual model allows manufacturing the real workpiece using Rapid Prototyping technology. The article describes also the hardware and softwareaspects of the RP technology.

In the paper energy supply system based on photovoltaic (PV) arrays was described. Also models of a single PV cell and a voltage boost converter were described. The boost converter was used for holding an appropriate work state of the PV arrays associated with its maximum power point level in various work conditions associated with irradiance level and the arrays temperature. Finally, comparison of two strategies of voltage level control in PV arrays system was put forward. These strategies were used to attain the maximum power point, and to define the work conditions, in which described control algorithms are the most effective.

This paper presents a method of creating a model of proportional flow control in Matlab- Simulink. A mathematical model of the controller and power supply system where the regulator is running. Model in Simulink is a block diagram. The individual blocks represent components of the hydraulic system.

In the paper the real-time system based on FPGA applied to control the delay time in feedback loop of the Self-excited Acoustical System is presented. The system can be used for stress change measurement in elastic constructions. Stress changes manifest themselves in small but detectable variations of resonance frequency. This phenomenon can be used to indirect measure stress changes in the material. In the article the limits of the measurement system which occurred during research on the analogue version of the system were eliminated by applying FPGA technology.

This paper presents the results of study in the structure and texture CuSn6 alloy deformed in the RCS (repetitive corrugation and straightening) process. Investigated the influence of process parameters on the above property. The obtained results were correlated with the results of the alloy subjected to cold rolling.

The paper presents the results of research on minimizing the air consumption of the air cushions used to move the transport platform. This kind of transport becomes more popular in industry. It is applied especially to move heavy machinery and equipment in factories with hardened floors. The working medium is air. This system has many advantages but it is characterized by high air consumption. The paper takes the issues of searching solutions to minimizing the air consumption. To perform the computational analysis a mathematical model was defined. Simulations were performed by using Maple software.

The paper presents a method of optimizing the geometry of a cycloid positive displacement pump using genetic algorithm. This allowed for increasing its delivery and efficiency and reduce pulsation.

The paper presents an application of finite element method in the optimal design of the nut with a groove in the end-face. There were described issues of the load distribution and FEM modeling of threaded connections. The optimization problem was formulated with the aim of obtaining the uniform load distribution on the bolt’s thread depending on the geometry of nut.

Machines and devices control can be held using keyboard, joystick, touch interface, gesture recognition interface or speech. Completely different control form is biosignals use, such as electromyogram, electrooculogram or electroencephalogram. In the article presented the controller construction of electro-pneumatic servo drive, which control is backed up by biosignals generated by activity patterns in muscles, brain and eye.

The vibrations and noise caused by pressure pulsations are one of the major problems in volumetric compressors manifolds. There is still no easy solution for this problem. Passive damping of those pulsations is possible using specially shaped nozzle placed in place of the straight tube. Experimental analysis of the pressure pulsations damping caused by a nozzle is possible however only some arbitrary chosen nozzle shapes can be investigated. The analysis of damping of the impulse flow by the nozzle using CFD simulation is more general and gives the possibility to estimate the nozzle influence on the pulsating flow in theoretical way, so many different shapes can be investigated. In this paper examples of impulse flow damping factors for three different nozzles have been shown.

This paper presents the utilization of Rapid Prototype technology in industrial design. On example of cover for AED training device there was presented in what way the prototype is made. Cad model created in PTC/Creo is ready to be printed using any of available RP technology.

The paper concerns the design of industrial installations using computer programs. It also contains a description of problems that must be solved by a constructor who designs industrial installations, their components and characteristics at different stages of industrial design.

The paper summarizes the system for WEB resources monitoring based on defined query. Experiment compares results returned by the proposed system to those provided by Google Search and Google Alert services. Results indicate that the system could be solid base for development and tests of pattern detection and information retrieval mechanism, while providing more data than Google solutions. Drawback of system and further development plans are also presented.

This paper presents an advisory expert system to assist the process of constructing the hydrodynamic torque converter. The system has been constructed using program Delphi 7 Enterprise in Object Pascal. The system includes three types of means of transport, a car, a rail bus and a working machine.

The paper presents a cubically convergent method for solving a standard boundary value problem consisting of n coupled first-order differential equations and n boundary conditions. The idea of the presented method is based on the shooting method using the expansion of the desired function into Taylor’s series including second-order derivatives. Effective use of the iteration formula requires introduction of sensitivity functions and their derivatives. In each iteration, the initial problem, composed of n(1+ n₁+ n²₁ ) first-order differential equations, must be solved, where n₁ signifies the number of unknown parameters. The convergence of the presented method has been illustrated on an example.

The paper describes how to prepare dynamic graphic filters, which main goal is to remove noise from an image and also to preserve information on edges between objects. These types of filters are able to focus on operations inside objects, and at the same time weaken the process at objects borders.

The estimation of a variance for a semi-parametric neural network model variance for geometric properties of sintered metal will be done on the basis of jackknife subsampling method. Calculation results are of great practical significance because it will be possible to use proposed approach in similar microscale modelling. The proposed approach is simple and has many advantages if model identification procedure is computational expensive.

This paper describes a unique multiphysics simulation tool allowing one to analyse and optimize the reactive moulding process used for the production of epoxy resin based electrical insulation in many power products. The presented methodology offers fully automated numerical computations of the mentioned process excluding the requirement for high knowledge and experience of the tool end-user in the area of computer simulations.

The paper summarizes the quantity assessment of GPU processing and supporting CUDA technology on the efficiency of BLENDER rendering program.

The paper presents the information flow between CAD/CAM/CNC systems when using the CNC machine tool programming language based on ISO 6983. Next, the data structure of the new programming standard STEP-NC, defined in ISO 14649, is presented. The information flow for this new standard is also discussed. The results of analysis show how this standard can be used for the increase of the automation of CNC machine tool programming.

The paper presents an analysis of switching time for pilot operated directional control valve [1–3] in a typical hydraulic system, in which the actuator is a hydraulic cylinder. A mathematical model has been built which contains equations of motion for the valve and actuator components, the balance of fluid flow, flow through the gap, and the principle of conservation of momentum and the flow curves of pressure relief valves [6, 8]. The system of equations is solved by fourthorder Runge-Kutta method. A survey to find minimal switching time has been conducted [4]. Positive overlap value, the coefficient of its movement resistance and control pressure value have significant impact on the switching time in the tested valve.

This paper presents a method with the use of CFD analysis for calculating the forces acting on the spool during the flow of working liquid stream through the electro-hydraulic pilot operated directional control valve. The liquid stream flowing through the directional valve causes hydrodynamic response according to the principle of conservation of momentum. Liquid pressure acting on the spool surface affects the forces balance of valve spool as well. An object of the research is the pilot operated directional control valve WEH22 type with flow rate up to 450 dm3/min. For the analysis ANSYS/Fluent software was used.

This paper presents results of computer simulation made to evaluate how the quality of the smart designs of experiment depends on the methods of generating. The quality of smart designs was evaluated by comparing the known values of special testing functions simulating the real research object and approximated values predicted by neural networks trained with the sets based on smart designs of experiment. The results suggest the possibility of significant reducing the number of experiments runs using studied smart designs.

In this paper the problem of volumetric flow rate regulation is considered. The change of angular position of an element mounted axially inside of the cross flow fan impeller creates different aerodynamic performances: yt = f (j), ys = f (j) at the same rotational speed and in consequence the qualitative diversification of fan operation is obtained. It gives possibility to use a cross flow fan for several applications depending on an actual requirement respecting to volumetric flow rate or pressure coefficient. The shape of inner element as well as its angular position have an important influence on the flow structures so a method of volumetric flow rate control without necessity of rotational speed change is proposed. This way of cross flow fan flow rate control, commonly made with use of frequency converter, seems to be more effective for reduction of an energy consumption and gives an evidenteconomic advantage.

The paper describes the main features of visual management systems applied to track production state inside manufacturing cells. The description is restricted to the class of the systems called electronic andon system. The way of gathering data from manufacturing cell about process performance is depicted. Integration of electronic andon with ERP systems is presented.

The paper discusses various approaches used to solve flexible job-shop scheduling problem concentrating on formulations proposed in the last ten years. It mainly refers to the applied metaheuristic techniques which have been exploited in this research area. A comparison of presented approaches is attempted, some concluding insights are highlighted. Finally future research directions are suggested.

The main goal of the paper is modelling of phenomena accompanying the steel subjected to deformation in very high temperature. Analysis of the phenomena in solid surface part and semi-solid core is necessary due to inhomogeneity of material properties in both the zones of the sample. Experimental basis of the work were TESTS done in IMZ Gliwice using Gleeble 3800 physical simulator. The interpretation of the tests was done using Def_Semi_Solid software. This program allows the numerical analysis of steel behaviour during deformation of axial-symmetrical samples at very high temperatures. The paper presents the comparison of experimental and numerical results.

This paper shows example results of computer simulations supporting the production process of sink. Design and verification of deep drawing process and tools design were carried out using finite element models implemented in Inventium Suite. Wrinkling and fracture of the material were the main phenomena subjected to the investigation using numerical analysis. A number of computer simulations were carried out in order to eliminate defects and analyze the shape of the final product.

This paper presents a preliminary investigation on medical image watermarking using biometric watermarks. The goal is to elaborate simple watermarking system based on discrete wavelet transform (DWT) decomposition and binary iris code insertion. The performance of proposed algorithm is evaluated by Hamming distance between embedded and extracted iris code.

This paper introduces the main conclusions of the doctoral thesis “Strategy of maintenance system in industrial company”, which focuses on improving of economic efficiency of the maintenance system by selecting the appropriate maintenance strategy for production machines. In the paper I characterise outputs of the survey, which focuses on characterization of maintenance management level, maintenance cost control and allocation level and range of modern maintenance management tools (Computerized Maintenance Management Systems = CMMS) utilization in industrial enterprises in Czech Republic. This article also deals with proposed methodology for selecting the appropriate maintenance strategy and with the brief characteristic of the model MAM (Maintenance Analytical Module), which was developed as a decision support tool for maintenance managers.