Data processing: structural design – modeling – simulation – and em – Simulating nonelectrical device or system
Reexamination Certificate
1999-11-15
2004-08-17
Teska, Kevin J. (Department: 2123)
Data processing: structural design, modeling, simulation, and em
Simulating nonelectrical device or system
C345S960000, C700S083000
Reexamination Certificate
active
06778947
ABSTRACT:
This invention is directed to a method of designing and/or visualizing at least one roll/felt combination in the wet press of a paper or cardboard making machine. DE 38 35 641 A1 discloses a method of controlling and/or monitoring the drying process of a paper or cardboard web.
In this method, the air distribution system of a so-called yankee cylinder is triply divided, and a computer is used to control the drying process. Controlling and monitoring the drying process of the yankee cylinder is carried out on the basis of an on-line simulation program with the intention of achieving improved paper quality and more effective drying both in respect of energy consumption and of the actual drying process. To this end a process model is utilized which was established on the basis of trial runs, on-line measurements and/or the drying theory. From a so-called type file or recipe file, set-point parameters in accordance with the web types to be run are entered into the process model, and at predetermined time intervals the simulation program is provided with fresh initial values which are supplied by measuring transducers of the drying process. It is stated that thereby the disclosed process model is adaptive. Hence, the known simulation program will calculate, for instance, the evaporative capacity for every segment of the web to be dried, the dry content and temperature of the paper as well as the energy consumption of the individual drying segments on the basis of the initial values. Additionally, it is possible to determine the velocity, humidity and temperature of the blow air.
In contrast with the drying method disclosed in DE 38 35 641 A1 with air flows directed against the web, there are paper making machines including dewatering members which comprise wet press felts, drying screens, and rolls. By means of wet pressing, as it is called, the paper or cardboard web is drained or dewatered in controlled fashion, the respective machine covering governing the quality of the finished products, the smooth running of the press, and the service life of the felts.
In this respect, the performance of the covering within the press is dependent on the defined roll configuration which in its turn interacts with the felt material.
The alternating effects and influencing parameters of roll/felt combinations in wet presses are extremely complex, and undesirable and unforeseeable alterations in quality or undesirable limitations in productivity during operation of the paper making machines will result due to clogging of the felt in operation. Prior known designing methods in respect of configuring an optimum roll/felt combination rely on sometimes extensive test runs and investigations of modifications necessary on site at the customer's plant, but such investigations are highly time-consuming and costly.
It is therefore the object of the present invention to provide a method of designing and/or visualizing at least one roll/felt combination in the wet press of a paper or cardboard making machine, said method being capable of acquiring the complex processes in the wet press under consideration of the existing multiplicity of influencing parameters and to represent these processes in a simple and clear way, and particularly customer-specific initial approximations in respect of critical problems of felt design should be capable of being found with a view to optimum efforts in time and costs. The method according to the present invention endeavors to achieve decisions concerning application technology within shorter time periods, wherein operations may be predicted, visualized and tested direct on site, for instance when advising the customer or with already existing plants. Additionally, an analysis of problems that may occur should be executable by means of the invention in a fast and cost-efficient way.
The object of the invention is solved with a method as set out in the teachings of claim
1
, and the dependent claims comprise at least suitable embodiments and further developments thereof.
The basic idea of the present invention resides in performing a functional analysis of individual roll/felt combinations of presses with reference to a standard database and to predetermined, easily visualizable known press configurations while in the first place not requiring individual considerations in respect of the multiplicity of complex parameters characteristic for the wet pressing and drying process.
To this end, computing steps for showing the result are shifted to the background particularly when there exist altered input parameters, while the execution of the required arithmetic operations occurs nearly simultaneously, so that a feedback of altered parameters in respect of the dewatering capacity and the performance of the wet press may at any time be fetched for analysis, and especially also process-related analysis.
From a set of offered press configurations the present method accordingly selects the respective actual configuration that is to be designed or visualized, wherein additionally the respective application and the desired paper or cardboard quality may be considered as a criterion governing the selection.
Subsequently, within the selected press configuration, a press, i.e. a roll/felt combination, will be selected and relevant initial machine and roll parameters of the selected press will be read and displayed in the internal database.
Due to the reading of database standard parameters a reasonable set of data will be available for starting the designing process while actual technical facts are taken into consideration.
Due to the fact that the database is updated in the sense of a self-learning process, as will be possible in an advantageous embodiment of the present invention, the method will be qualified in the course of its application so that by making use of the existing computer system, the inputting efforts will be further reduced, on the one hand, and the meaningful content of the displayed results will be enhanced, on the other hand.
On account of a multiplicity of spreadsheet-like allocations of standard parameters and results to be displayed upon reference to these standard parameters, the respective arithmetic efforts are reduced. In other words, a recalculation of results has to be executed only upon a change of the input parameters provided there are no previously calculated results for these input parameters present in the database. This measure renders the method according to the invention suitable for on-line process control so that it may accordingly also be used for continuously monitoring and controlling wet presses in paper and cardboard making machines.
After calculation and display of the results relating to the current dewatering performance of the respective selected press it will be possible to make a controlled alteration of machine and/or roll parameters of the selected press.
It is an essential feature of the present invention that the reading of relevant felt parameters to be allocated already starts when reading or re-writing machine and roll parameters from the and into the standard database, respectively. Such reading of felt parameters, or also a calculation of values characteristic for the dewatering performance is always executed in the background. It is possible by means of such background calculations to minimize the amount of image data required for visualization, on the one hand, and to provide in good time the connection between the properties of roll and felt, i.e. the concrete roll/felt combination, which is required for displaying the result, on the other hand.
Due to the felt and roll analysis which is performed in quasi-parallel fashion and the separate displaying of the respective analysis results under consideration of the values required for the interaction between the paired combination, the otherwise hardly recognizable performance of the wet press is more easily represented. In particular, due to the well arranged representation it is more easily possible in respect of the controlling and monitoring tasks to recognize counte
Garcia-Otero Ed
Myers Bigel Sibley & Sajovec P.A.
Stowe Woodward AG
Teska Kevin J.
LandOfFree
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