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1

Experimental Investigations on the Ejector Forces in the Die Casting Process

Krischke S., Müller S., Schuchardt T., Kouki Y., Dilger K.

Archives of Foundry Engineering

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2018

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Vol. 18, iss. 4

116--119

EN

A measuring system was developed for the measurement of ejector forces in the die casting process. When selecting the sensor technology, particular care was taken to ensure that measurements can be taken with a high sampling rate so that the fast-running ejection process can be recorded. For this reason, the system uses piezoelectric force sensors which measure the forces directly at the individual ejector pins. In this way, depending on the number of sensors, it is possible to determine both the individual ejector forces and the total ejector force. The system is expandable and adaptable with regard to the number and position of the sensors and can also be applied to real HPDC components. Automatic triggering of the measurements is also possible. In addition to the measuring system, a device and a method for in-situ calibration of the sensors have also been developed. To test the measuring system, casting experiments were carried out with a real aluminium HPDC aluminium component. The experiments showed that it is possible to measure the ejector forces with sufficient sampling rate and also to observe the process steps of filling, intensification and die opening by means of ejector forces. Experimental setup serves as a basis for future investigations regarding the influencing parameters on the ejection process.

2

The CoreGram Project : theoretical linguistics, theory development, and verification

Müller S.

Journal of Language Modelling

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2015

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Vol. 3, No. 1

21--86

EN

This paper describes the CoreGram project, a multilingual grammar engineering project that develops HPSG grammars for several typologically diverse languages that share a common core. The paper provides a general motivation for doing theoretical linguistics the way it is done in the CoreGram project, and is therefore not exclusively targeted at computational linguists. I argue for a constraint-based approach to language rather than a generative-enumerative one and discuss issues of formalization. Recent advantages in language acquisition research are mentioned and conclusions on how theories should be constructed are drawn. The paper discusses some of the highlights in the implemented grammars, gives a brief overview of central theoretical concepts and their implementation in the TRALE system, and compares the CoreGram project with other multilingual grammar engineering projects.

3

Real-time human in the loop MBS simulation in the Fraunhofer robot-based driving simulator

Kleer M, Gizatullin A, Dreßler K., Müller S.

Archive of Mechanical Engineering

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2014

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Vol. LXI, nr 2

270--285

EN

The paper encompasses the overview of hardware architecture and the systems characteristics of the Fraunhofer driving simulator. First, the requirements of the real-time model and the real-time calculation hardware are defined and discussed in detail. Aspects like transport delay and the parallel computation of complex real-time models are presented. In addition, the interfacing of the models with the simulator system is shown. Two simulator driving tests, including a fully interactive rough terrain driving with a wheeled excavator and a test drive with a passenger car, are set to demonstrate system characteristics. Furthermore, the simulator characteristics of practical significance, such as simulator response time delay, simulator acceleration signal bandwidth obtained from artificial excitation and from the simulator driving test, will be presented and discussed.

PL

Artykuł zawiera przeglĄd architektury sprzętowej i charakterystyk systemowych symulatora kierowania pojazdem opracowanego w Instytucie Fraunhofera. Na wstępie zdefiniowano i przedyskutowano szczegółowo wymagania dla modelu czasu rzeczywistego i obliczeń w czasie rzeczywistym. Zaprezentowano takie aspekty systemu, jak opóźnienie transportu i obliczenia równoległe złoŻonych modeli czasu rzeczywistego. Pokazano ponadto działanie interfejsu pomiędzy modelem i systemem symulatora. W celu zademonstrowania charakterystyk systemu wykonano dwa testy symulatora: w pełni interaktywny test kierowania koparkĄ kołowĄ w nierównym terenie, oraz test kierowania samochodem pasaŻerskim. Co więcej, charakterystyki symulatora majĄce znaczenie praktyczne, takie jak opóźnienie czasowe odpowiedzi symulatora, pasmo sygnału przyspieszenia symulatora wyznaczone przy sztucznym pobudzeniu i z testu kierowania pojazdem zostały zaprezentowane i przedyskutowane.

4

The Experimental Analysis Of Non-Thermal Plasma Reactor Use For Marine Diesel Exhaust

Borkowski T., Myśków J., Hołub M., Kalisiak S., Müller S., Rolf-Jürgen Z.

Journal of Polish CIMAC

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2007

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Vol. 2, no 1

77-84

EN

The control of NOx (NO and NO2) emissions from marine engines remains a challenge. In recent years, there have been a number of reports show that plasma device combined with a catalyst can reduce as high as 90% of NOx in simulated diesel exhaust gas. In the case of real diesel exhaust, the beneficial role of a plasma treatment is now thought to be the oxidation of NO to NO2, and the formation of partially oxidized hydrocarbons that are more active for the catalytic reduction of NO2. This paper briefly describes research efforts aimed non-thermal plasma reactor development for ships use, and primary focused on NO oxidation conditions, functionally fitted to the engine mode of operation.

5

Nonlinear dielectrics for tunable microwave components

Jakoby R., Scheele P., Müller S., Weil C.

Kwartalnik Elektroniki i Telekomunikacji

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2004

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Vol. 50, z. 4

675-694

EN

Agile materials and technologies based on nonlinear dielectrics like ferroelectrics or liquid crystals offer a line of passive tunable microwave components such as varactors, filters and phase shifters, suitable as key components in phased-array antennas e.g. for automotive radar sensors and in future reconfigurable (frequency agile) RF-frontends, e.g. in mobile communications systems with multiband operation. The trend towards these commercial microwave applications involves a demand for cheaply integrated, compact devices with both, high tunability and low insertion loss. Therefore, distinct research interests have been focused on agile materials for tunable microwave components as promissing alternatives to active semiconductor devices or MEMS varactors. Starting with some results of ferroelectric thin-film devices from literature, the focus of this paper will be on our research of tunable microwave components based on (1) ferroelectric thick-films on A1203-substrate and (2) liquid-crystals. Up to now, only very few approaches used an anisotropy at microwaves, e.g. for phase shifting purposes. However, with recently developed, novel highly-anisotropic microwave LCs, a figure-of-merit of above 110°/dB at GHz has been achieved for a inverted- microstrip line phase shifter with comparatively low control voltages less than 30 V. At the same frequency, this exceeds by far the figure-of-merit of 30 to 50°/dB of BST-coplanar waveguide phase shifters, however, much lower tuning speed. This substantial progress opens up totally new low-cost LC applications beyond optics.