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Statistical evaluation of impact factors to the energy consumption of machine tools

100%

Wittstock V. , Kolouch M. , Paetzold J.

tom Vol. 13, No. 2

79--91

In this paper, a method for the evaluation of the energy consumption of machine tools is presented. For this purpose, the energy consumption of various machine tools has been investigated experimentally. In order to increase the evaluation basis, measured values of energy consumption were also taken from literature. The evaluation contains an analysis of various factors concerning the productivity and the size of the investigated machine tools. This analysis is capable of detecting the impact factors to increase the energy-efficiency of production systems. It can further reduce the effort required for data acquisition when various machine tools are compared.

Broadband concept of energy harvesting in beam vibrating systems for powering sensors

75%

Rysak A. , Müller M. , Borowiec M. , Zubrzycki J. , Litak G. , Godlewska-Lach A. , Wittstock V.

tom Vol. 8, nr 23

62--67

Recent demand for powering small sensors for wireless health monitoring triggered activities in the field of small size efficient energy harvesting devices. We examine energy harvesting in an aluminium beam with a piezoceramic patch subjected to kinematic harmonic excitation and impacts. Due to a mechanical stopper applied, inducing a hardening effect in the spring characteristic of the beam resonator, we observed a broader frequency range for the fairly large power output. Impact nonlinearities caused sensitivity to initial conditions and appearance of multiple solutions. The occurrence of resonant solution associated with impacts increased efficiency of the energy harvesting process.