Applied Mechanics and Materials Vol. 816

Abstract: The aim of the thesis is the solution of kinematics analysis model of the conveyor with a crank mechanism. For solution is to use a graphical method for determining the kinematics parameters of the individual members of the mechanism. In part kinematics analysis is also used MSC Adams View program that is designed to address the problems of kinematics and dynamics of systems with more degrees of freedom. This program shows the displacement, velocity and acceleration and angular velocity and angular acceleration of members. Finally, the work presents the results with graphic display of parameters such as displacement, velocity and acceleration. Introductory chapters are devoted to general issues kinematics mechanisms and the following chapters are devoted to a particular model of the conveyor mechanism.

Abstract: The given paper is closely connected with the complex proposal relating to the resistance temperature sensor for media temperature. The mentioned proposal is based on the analysis and simulation of loading with the reference to the resistance temperature sensor during the media flow in the pipeline while the heat transfer in solid body and media occurs simultaneously. The simulation of the loading was carried out on the basis of finite element method (FEM) using Cosmos Motion 2.86 program software. During the given investigation, the different media temperatures as well as different velocities or rates of media flow were taken into account.

Abstract: Many applications in robotics require precise tracking of the prescribed path. The classic “tracking controllers” are not appropriate for this type of tasks, because they do not guarantee that the robot remains on the prescribed path. The aim of this paper is to propose and to verify, by means of computer simulation, the method of control, which ensures that the “output” of the robot will move along the prescribed path.

Abstract: In the paper, we experimentally analyze a pneumatic actuator and possibilities of piston positioning. Paper shows mathematical model of pneumatic actuator. Actuator is experimentally tested and therefor experimental stand is assembled for the purposes of positioning of actuator piston. The changing parameters during the experiment are weight of load and pneumatic pressure. The results show how these parameters can have influence on precise positioning of pneumatic actuator. For experiment there is purposely used open loop control system. The aim of the study is not to show control method for positioning but to show influence of mentioned parameters.

Abstract: This paper presents the calculation of dynamic parameters of virtual prototype of mechanism, which function is the correct tensioning of wedge belt of belt gear. Sudden release of tensioning device usually occurs during the assembly process, large impact forces which form have destructive effect on the device. A part of the paper will be the analysis of input parameters for solution by function Impact. Impact effects will be solved with flexibility of chosen member of the mechanism in mind. The solution will be realized in the environment of software MSC.ADAMS and ANSYS.

Abstract: The analysis of negative impact of flexible mechatronic system parameter error and its reduction is presented in this contribution. The MPC method is proposed to use for reduction of double notch filter insufficient effect, which was initially integrated into system for flexible joint parasitic frequencies elimination. Simulation experiments results – response of system angular velocity and control process quality analysis confirmed the correctness of proposition of MPC controller using.

Abstract: The article presents the use of finite element method for the simulation of cold forming process. The numerical simulation of a real technological operation of bending a rod by an industrial bender. Within the simulation, different types of nonlinearities, namely of material nonlinearity, resulting from the flexible plastic material properties of the rod, are considered, geometric nonlinearities result from large displacement and nonlinear contact. This paper briefly describes the elastic – plastic material model. Numerical analysis confirmed the appropriateness of the use of finite element method in the simulation of technological operations and the eventual possible optimization of these processes.

Abstract: The paper is thematically connected with paper making machines. This type of the machine is equipped with a head which has a flexible slice lip for skimming the pulp applied to produce the paper. The definition of geometric features of the slice lip is a key issue. The slice lip should be made of material which is resistant to external factors, and designers want to obtain a high flexibility of this element. It is possible to get a high flexibility by forming a proper shape of the slice lip. The paper presents the proposal of dimensionless geometric indicators which combine basic geometric parameters of the slice lip. These indicators are the following: indicator of the cross-section, indicator of the length and indicator of the length of the transverse notch. FEM strength analyses were done – the aim of these analyses was the determination of the stress state and maximum deflection of the slice lip. The authors have analysed the slice lip with holes for mounting the actuators and the slice lip and with transverse notches for increasing its flexibility. The results were presented in the form of graphs.

Abstract: The containers used for fluid storage in food industry are during their operation exposed to processes that can potentially lead to the danger of possible overloading (pressure of protecting atmosphere, pressure of fermentation gas over must level, and so on). In the paper are analyzed possible causes of large plastic deformations of vessels that are used for must fermentation.

Abstract: The article analyses the measurement with increased absorption kinetics of hydrogen into the La_0.85Ce_0.15Ni₅ alloy. Within a time interval of 180 s an amount of 0.142 kg (1.58 m³) of hydrogen was absorbed into 56 kg of alloy. The process of absorption was accompanied by an increased temperature of the bed. Therefore it was simultaneously cooled by a cooler using Peltier elements. The numerical calculation of non-stationary heat transfer within the bed was performed with a known amount of heat generated in the bed, known temperatures and flow rates. Simulation results allow us to determine temperature time paths at key points of the bed and give insight on the transient phenomena which occurs in the extreme load of the metal hydride (MH) bed. This allows establishing safe limits for the absorption of hydrogen into a particular alloy.