Applied Mechanics and Materials Vol. 816

Abstract: The article deals about an application of two types of dynamic absorber applied on an operator’s seat. In the first case, the seat is suspended by passive elements. The passive dynamic absorber (DA) is composed from a viscous damper and a linear spring. In the second case, the semi-active damper is composed from a linear spring and a MR damper. The affectivity of the vibration reduction of the seat is observed. The parameters of the seat suspension with the passive DA were identified from multi-criterion optimization using genetic algorithms. The parameters of the semi-active DA were evaluated using information obtained from the passive DA.

Abstract: The paper describes the problems and state of art in control system with parallel axes. Basic theoretical principles of synchronization control are considered, Modified master-slave synchronization method is described. Experimental unit is used to investigation of master-slave synchronous control method, simulation and experimental results are described.

Abstract: This article discusses the distribution of temperature in a transport container for spent nuclear fuel due to the generation of residual heat. ANSYS CFX simulation software was used to determine the temperature fields. The container is constructed of thick-walled carbon steel. Fins were provided on the outer casing of the container for better heat dissipation. Numerical simulations of temperature fields will be performed on the transport container with C-30 type designation. A container with a flow of water and nitrogen within the casket was considered during the performance of numerical simulation. The results of numerical simulations define the distribution of temperature fields, subject to adhering to storage conditions which prevent surface temperatures exceeding permissible values.

Abstract: The present paper describes the determination of boundary conditions of the 10 kVA plasma reactor graphite electrode cooling. The water cooler installed on the lid of the reactor, connected in open circuit, sustains the permissible service temperatures in the analysed area of the reactor. With the monitoring of the coolant flow and temperatures at the inlet and outlet of the cooler, the heat flux necessary for the design of a closed circulation cooling circuit was determined. Software support of HTC-FC (heat transfer coefficient – natural convection) and simulation software ANSYS CFX were used to solve the design and functionality of the proposed solution. This software is designed for the numerical calculation of differential equations describing fluid flow and heat conduction with the use of the finite volume method. With the application of time-dependent boundary conditions in the simulation tool ANSYS CFX, we acquired information about the temperature distribution of the cooling medium during the operation of the described technology and also about the change in the variation of heat flux between the environment and the proposed container.

Abstract: This paper deals with the possibility of controlled deformation of the actuator of a flexible system. In the solution, large deformations of the actuator have been assumed. The model was made of a material capable of large deformations caused by internal pressure. The internal pressure was let into the cavities located in the actuator. The solution was realized analytically and numerically. The results show the relevance of the stated proposal.

Abstract: The paper is devoted to the description of project of storage system for the spent nuclear fuel. The proposed dry storage system is based on the natural convection of air so no additional fans are needed for the cooling. In the paper basic parameters of the storage as well as some preliminary computations verifying its concept are described.

Abstract: The main reason for the choice of this theme is the extension of use of valve mechanisms and the possibility of using the new simulation program MSC Adams. The aim of this paper is to become familiar with the problems of the valve mechanism, the dynamic analysis and computer simulation. In this paper we described an overview of the problems compiling a mathematical model of the mechanism of the valve timing. After creating a mathematical model was made in the simulation program MSC Adams/View. The equation of motion of a mechanical valve mechanism was compiled Lagrange equations second order. The actual solution procedure that is mentioned in this paper can be applied to solve complex problems and shape of the valve mechanisms.

Abstract: Management of universal shelf stacker process many varied operations, whose are different in difficulty of solved problems, time of reaction of controller and next parameters. Usually is used one controller with all functions, which have many external input-output modules and have to solve parallel many tasks together. The control application have to be very complicated and blind with risk of collisions control processes and needed of solving control process priority. If the processes are separated to the groups, every group of processes solved with separate control automat. For simple processes, whose needs immediate reaction can be used simple and easy controller, complex control processes have to been solved with controller with sufficient performance, mathematical performance and adequate memory.

Abstract: The paper comments on the new possibilities of utilizing the inertial navigation system in robototechnics. It deals with the application of a new inertial measurement system for a robotic workplace calibration. The calibration is necessary so that the simulation model of the production device can adjust to the real geometric conditions.

Abstract: The paper deals with the design of an ideal positioning servo system. To achieve this aim, we will derive transfer functions of the PID controller and the second-order low-pass filter while using typical fault frequencies for PID controller with a low pass filter. Consequently, an overall frequency characteristic of the open servo system will be depicted. This characteristic will be further used to determine the amplitude and phase safety, which determine the degree of stability system.