Applied Mechanics and Materials Vol. 308

Abstract: The paper presents results of the technological head vibrations acceleration amplitude evaluation and their corresponding frequency spectrums due to changes in the abrasive mass flow at division of abrasion resistant steel on a particular work with AWJ technology. The waveforms of technological head vibrations acceleration amplitude and their frequency spectrums are evaluated for the unworn directing tube.

Abstract: The paper is aimed at abrasive water jetting of non-corroding steels treated by cryogenic temperatures in liquid nitrogen. The investigation of cut walls shows that cryogenic temperatures influence material structure and respective properties. This research is focused on improvement of material reliability in various states of production systems and operation conditions.

Abstract: The paper presents a sample of wider set of new findings and recommendations from the area of the influence of technological parameters on the quality of surface of steel HARDOX 500 cut by AWJ technology and obtained by the evaluation of a large set of experiments within long-term activities of the Department of Manufacturing Processes Operation, Faculty of Manufacturing Technologies, Technical University in Košice, aimed at the diagnostics of operational states of manufacturing systems with AWJ technology.

Abstract: The experiments with pure water jets were performed both in laboratory and in a quarry. The basic information about water jet system operation in quarry conditions has been acquired and some relations between data from a quarry and the laboratory ones have been determined. The efficiency of the cutting system in quarry conditions is considered and discussed.

Abstract: This paper deals with basic knowledge and problems in area of Rapid Prototyping (RP) technology operation focused on used material testing and operation optimization from economical aspects of view. It belongs to progressive methods of model creation based on geometry obtained from CAD environment with application possibilities in different industrial spheres. Chapters are focused on optimization of Rapid Prototyping preparation and operation process. There also is algorithm that leads to selection of suitable RP operation settings. Utilization of algorithm is presented on case of part production with use of UPrint device and Catalyst software, system created for utilization of Fused Deposition Modelling (FDM) technology.

Abstract: This article describes the vision system, which is designed for diagnostics of defects in casted products. In the first part an overview about image processing, edge and pattern recognition algorithms and current status in available free and commercial vision libraries is found. For the described task we selected open source Aforge .NET library. The next part describes common defects in casted products. Modular education system MPS 500 from Festo with conveyor and palette with plastic parts is used for simulation of production system. This system contains an industrial robot which can be used for sorting defective parts. The selected vision library is used for two level diagnostics of algorithm implementation. The first level algorithm detects position of part, its dimensions and edge disturbances. The second algorithm detects any defects inside of a part. The basic algorithm is presented only for circular shape with red color texture, but can be easily extended to other basic shapes by shape detector.

Abstract: The paper describes operating modes of the PAM based actuator consisting of two pneumatic artificial muscles (PAMs) in antagonistic connection. The artificial muscles are acting against themselves and resultant position of the actuator is given by equilibrium of their forces according to different pressures in muscles. The main requirement for operation of such pneumatic actuator is uniform movement and accurate arm position control according to input desired variable. There are described in paper operation characteristics of the pneumatic artificial muscle in variable pressure and then operation characteristics of the pneumatic artificial muscle actuator consisting of two muscles in antagonistic connection.

Abstract: The article describes the experimental analysis method of worm gear boxes for specific products. The measuring station for the dynamic load worm reducers testing can simulate various extreme transition modes of operation. There are assessed low and high frequency vibration.

Abstract: The article studies, based on the evaluation of the experimental research, effectiveness of independent and combined interaction of vibrodiagnostic and tribotechnical methods when diagnosing gearbox of the small hydroelectric power station in course of 6 months. During this time the general overhaul of the gearbox was carried out, where the measurements, analyses and evaluations were focused on run-in and a shorter after run-in period of the gearbox.