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1

Simulation for instable floating of hydrodynamic guides during acceleration and at constant velocity

Zhang Y., Wittstock V., Putz M.

Journal of Machine Engineering

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2018

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Vol. 18, No. 3

5--15

EN

High speeds and the resulting hydrodynamic pressure lead to significant floating of the linear guides. During this movement, the floating behaviour shows phenomena that can be explained by the Reynolds equation. This paper presents a dynamic model of the floating behaviour, which adds tribological approaches to the common Reynolds equation since the floating behaviour does not only depend on the speed, but also on numerous other conditions. This developed simulation method is based on the use of finite difference elements and was implemented using Simulink and Matlab, allowing flexible implementation of further influences such as lubrication cycles and geometry of the sliding surface. After adapting the simulation model and determining the parameters, the calculated floating behaviour corresponds well with the experimental results.

2

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

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

Advances in Science and Technology. Research Journal

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2014

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Vol. 8, nr 23

62--67

EN

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.

3

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

Wittstock V., Kolouch M., Paetzold J.

Journal of Machine Engineering

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2013

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Vol. 13, No. 2

79--91

EN

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.