E. Kibirkštis

Investigation of Multifunctional Actuators on an Air-Cushion

This paper analyses the area in which synchronic operation of several pneumatic actuators connected by a rigid link exists. The minimum values of the supplied compressed air have been determined under which self-exciting vibrations appear in the system of several actuators. The influence of the transducers geometrical parameters on the variation law of motion of the system working organ has been investigated. It has determined that character of dependencies of peak-to-peak and frequency upon pressure of system is similar to character of dependencies separate transducer and that having picked up geometrical and dynamic parameters actuators it is possible to receive difficult (biharmonic) movement of system. This property can be applied in vibrostands meant for material or equipment trials and their vibrational processing.

Microscopic analysis of recycled paper effect on print quality parameters.

To determine whether the geometrical accuracy of small printed elements does not worsen on recycled paper, microscopic analysis of the dot area and the graphic elements raggedness printed on different types of recycled and coated papers at different screen ruling was carried out. Experimental tests have shown that geometrical accuracy of small elements printed on recycled paper/cardboard, in comparison to pictures printed on primary production paper is almost the same. Microsc. Res. Tech. 76:890–892, 2013.

Application of Smart Materials in Structural Elements of Pneumatic Vibroexciters

Pneumatic vibroexciters which consist of smart materials’ structural elements and are operating under autovibration regime were designed. The chamber of vibroexciter actuator with changeable capacity for flowing pressured air made of shape memory alloy (SMA) were presented. Mechanical characteristics of such type vibroactuator were estimated: maximum deformation of structural element with SMA, possible force of martensitic transformation. The result of the research allows to design functional adaptive pneumatic vibroexciters with are suitable for the different purposes of technological processes.