Publications Search Results
Now showing 1 - 10 of 21
PublicationCombining the Advantages of Different Processing Solutions Using a Novel Motion Processing Approach( 2021)
;Holowenko, O. ;Troll, C. ;Ihlenfeldt, S.Majschak, J.-P.In processing machines, technological tasks are implemented using suitable processing solutions. Those processing solutions can in turn have very different characteristics and specific advantages and disadvantages, e.g., concerning sensitivity to changing operating speed. In state-of-the-art processing machine controls, executing one single processing solution is supported. The execution of various processing solutions together and the combination of their advantages is currently not supported at all. In this article, a motion control approach is discussed that allows combining seemingly incompatible process solutions for a given technological task into a hybrid process solution, using the example of processing machines. The objective of this approach is to increase the achievable process window of the machine in terms of operating speed. It is shown that combining different process solutions can merge their advantages and compensate for their disadvantages. The article brings together the lessons learned from previous work in a new application to exploit advantages and compensate for disadvantages.
PublicationA Novel Adaptive Interpolation Approach for the Implementation of Operating-Speed-Dependent Motion Profiles in Processing Machines( 2021)
;Holowenko, O. ;Troll, C. ;Ihlenfeldt, S.Majschak, J.-P.Increasing the output of a processing machine should often be achieved by increasing the machine's operating speed. Associated with the increasing operating speed are undesirable effects occurring on the machine or process, e.g. vibrations that limit the operating speed. This paper discusses some selected causes for limitations that may occur on processing machines. An already developed approach to dealing with the problems is shortly presented. It is discussed why it is effective in some processes but not in others. Consequently, the existing approach is extended by an adaptive interpolation approach that deals with the changing operating speed. This extension has the effect that the advantages of the new approach can be applied to processes that have been insufficiently supported so far. With this approach, the calculation effort for motion optimization and path preparation can be reduced. The resulting amount of data decreases significantly as well. Eventually, the a dvantages of the novel interpolation approach are demonstrated by a process simulation with a validated numerical model.
PublicationControlling Liquid Slosh by Applying Optimal Operating-Speed-Dependent Motion Profiles( 2020)
;Troll, C. ;Tietze, S.Majschak, J.-P.In this paper, an investigation is presented that demonstrates the application of a new approach for enabling the reduction of liquid slosh by implementing optimized motion profiles over a continuous range of operating speeds. Liquid slosh occurs in the packaging process of beverages. Starting by creating a dynamic process model, optimal control theory is applied for calculating optimal motion profiles that minimize residual vibration. Subsequently, the difficulty of operating speed dependency of the herewith synthesized motion profiles is examined. An approach in which the optimal motion profiles are consolidated into a characteristic map of motion specifications, which can be executed by a programmable logic controller in real time, is discussed. Eventually, the success of this novel approach is demonstrated by the comparison with state-of-the-art motion profiles and conventional motion implementation.
PublicationModeling Transient Liquid Slosh Behavior at Variable Operating Speeds Induced by Intermittent Motions in Packaging Machines( 2020)
;Troll, C.Majschak, J.-P.The present paper deals with the problem of modeling liquid slosh occurring in the packaging process of containers filled with liquid. Sloshing effects are induced by one-dimensional intermittent motions and are undesired due to the necessity of quality control processes, such as weighing. Therefore, motion optimizations are often applied with the intention to minimize the residual vibrations. Valid process models are required to do so. The aim of this paper is to derive models for describing the liquid slosh behavior for different motions and for common practical circumstances, e.g., different container geometries as well as machine operating speeds, and to state the model's limits of use. Known model approaches are discussed, and their assumptions are reviewed experimentally. This leads to a set of limited ranges of operating speeds in which the applied models' assumptions are valid. The models are derived for these sets from experimental data, and a comparison is executed that enables the determination of the models' validity concerning their operating speed dependency. Finally, the validity of the derived models is investigated by comparing their predictive efficiency of describing the vibration for different motion profiles.
PublicationCommissioning new applications on processing machines: Part I - process modelling( 2018)
;Troll, C. ;Schebitz, B. ;Majschak, J.-P. ;Döring, M. ;Holowenko, O.Ihlenfeldt, S.The subject of this splitted article is the commissioning of a new application that may be part of a processing machine. Considering the example of the intermittent transport of small-sized goods, for example, chocolate bars, ideas for increasing the maximum performance are discussed. Starting from an analysis, disadvantages of a conventional motion approach are discussed, and thus, a new motion approach is presented. For realising this new motion approach, a virtual process model has to be built, which is the subject of this article. Therefore, the real process has to be abstracted, so only the main elements take attention in the modelling process. Following, important model parameters are determined and verified using virtual experiments. This finally leads to the possibility to calculate useful operating speed-dependent trajectories using the process model.
PublicationCommissioning new applications on processing machines: Part II - implementation( 2018)
;Troll, C. ;Schebitz, B. ;Majschak, J.-P. ;Döring, M. ;Holowenko, O.Ihlenfeldt, S.The subject of this splitted article is the commissioning of a new application that may be part of a processing machine. At the example of the intermittent transport of small sized goods, for example, chocolate bars, ideas for increasing the maximum machine performance are discussed. Therefore, optimal process motion profiles are synthesised with the help of a computer simulation. In the first part of the paper, the modelling of the process was shown. This second part focusses on implementing the simulated motion approaches on an experimental test rig, whereby the new motion approach is compared to the conventional approach. Hence, the increasing of the performance can be proven. Eventually, possibilities for an online process control are observed which are necessary to prevent unstable process conditions.
PublicationCorrosion and consolidation of outdoor weathered glazed ceramics( 2001)
;Mottner, P. ;Troll, C. ;Radujkovic, S.Römich, H.
PublicationBiogenic surface layers on historical window glass and the effect of excimer laser cleaning( 2000)
;Drewello, U. ;Weißmann, R. ;Rölleke, S. ;Müller, E. ;Wuertz, S. ;Fekrsanati, F. ;Troll, C.Drewello, R.
PublicationWelches Festigungsmittel eignet sich?( 2000)
;Müller, W. ;Kruschke, D. ;Köcher, C. ;Pilz, M. ;Römich, H.Troll, C.