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Closed Loop Springback Control in Progressive Die Bending by Induction Heating
Christian Löbbe,Christoph Hoppe,Christoph Becker,A. Erman Tekkaya 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
Large springback of high strength steels in progressive dies hinders accurate manufacturing because a proper prediction of elastic unloading is not possible due to material variations, tool wear, and varying ambient conditions. In order to compensate springback and enhance the forming limit when brittle materials are bent, a warm bending technology for progressive dies through inline induction heating is developed. Within a certain temperature range, there is a linear relation to the springback angle, which allows a direct influence on the final bending angle. Based on this principle, a closed loop control with a feedback of the angle after unloading is implemented, which adjusts the sheet temperature before bending. With the developed discrete controller, finally a stable and fast control mode is achieved so that an initial deviation from the target value is reduced to less than Δθ = ±0.30°.
A comparison of DAE integrators in the context of benchmark problems for flexible multibody dynamics
Peter Betsch,Christian Becker,Marlon Franke,Yinping Yang,Alexander Janz 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7
In the present work a uniform framework for general flexible multibody dynamics is used to compare state-of-the-art DAE integratorsin the context of benchmark problems. The multibody systems considered herein are comprised of rigid bodies, nonlinear beams andshells. The constitutive laws applied in the benchmark problems belong to the class of hyperelastic materials. To numerically integratethe uniform set of DAEs three alternative time-stepping schemes are applied: (i) an energy-momentum consistent method, (ii) a specificvariational integrator and (iii) a generalized-α scheme.
Hamacher, Michael,Stephan, Christian,Eisenacher, Martin,Lewczuk, Piotr,Wiltfang, Jens,Martens, Lennart,Vizcaí,no, Juan Antonio,Kwon, Kyung-Hoon,Yoo, Jong Shin,Park, Young Mok,Beckers, Johannes,H WILEY-VCH Verlag 2007 Proteomics Vol.7 No.15
<P>The Wellcome Trust Conference Centre at Hinxton, UK, was the meeting place of the 7<SUP>th</SUP> HUPO Brain Proteome Project Workshop entitled “High Performance Proteomics”. It started on Wednesday, March 7, 2007 with a steering committee meeting followed by a two days series of talks dealing with the standardization and handling of tissues, body fluids as well as of proteomics data. The presentation and accompanying vivid discussions created a picture of actual strategies and standards in recent proteomics.</P>
Sensitivity Enhancement of Methyl-TROSY by Longitudinal <sup>1</sup>H Relaxation Optimization
Lee, Dong-Han,Vijayan, Vinesh,Montaville, Pierre,Becker, Stefan,Griesinger, Christian Korean Magnetic Resonance Society 2009 Journal of the Korean Magnetic Resonance Society Vol.13 No.1
The NMR detection of methyl groups is of keen interest because they provide the long-range distance information required to establish global folds of high molecular weight proteins. Using longitudinal $^1H$ relaxation optimization, we achieve a gain in sensitivity of approximately 1.6-fold in the methyl-TROSY and its NOESY experiments for the 38 kDa protein mitogen activated protein kinase p38 in its fully protonated and $^{13}C$ and $^{15}N$ labeled state.