MM Science Journal, June 2009

Potential of state-feedback control for machine tools drives

L. Novotny, P. Strakos, J. Vesely, A. Dietmair
Keywords: Machine tools | drives and control | state – feedback control | state estimation

This paper describes basic principle of the state feedback control technique and its potential for the feed drive control in the machine tool domain. It evaluates the quality of the state control and compares it with the traditional cascade control. The emphasis is put on an estimation of the state variables using an FEM model of the feed drive mechanical structure and machine frame.

Computer modelling of suction cups used for window cleaning robot and automatic handling of glass sheets

Fr. Novotny, M. Horak
Keywords: vacuum robot gripper | suction cup | window cleaning robot | mobile platform

Optimizing vacuum grippers of robots for glass sheets handling and developing robots for glass cleaning, it is necessary to solve a number of problems calling for a similar approach to a solution. This paper analyzes deformation behaviour of vacuum gripping elements of vacuum grippers. The extent of deformation safety of an individual suction cup is monitored depending on the vacuum level and loadi (…)

Effects of microstructure and chemical composition on strength and impact toughness of tin bronzes

J. Audy
Keywords: Tin Bronzes | Microstructure | Chemical Composition | Strength and Impact Toughness

The present study is concerned with examining metallurgical features and their significance on strength and impact toughness of tin bronzes, with particular reference to bells. It has embraced a number of interrelated aspects – alloy types – composition, constitution and properties, fabrication technology, service life and effects of environmental/working conditions on strength and impact toughness (…)

Contribution to the production flexibility solution

D. Kumicakova, I. Kuric
Keywords: flexibility | automation | assembly gripper | similarity | clusters analysis

Production (manufacturing) flexibility is one of the dominant requirements of the present engineering industry. Automated assembly systems have a special position because of their technical and technological complexity. At the present the problem of determination of existing or planned assembly systems flexibility is elaborating at the many research workplaces. The attention is focused on to elabor (…)