Karlheinz Lehner

Karlheinz Lehner
Ruhr-Universität Bochum | RUB

Dr.-Ing. Dipl.-Inform.

About

26
Publications
6,930
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108
Citations

Publications

Publications (26)
Conference Paper
In mechanized tunneling a vast amount of data is created, processed and stored in various locations and formats. An integrative strategy supporting the processing and visualization of data from different sources connected with simulation based prognosis is increasingly required considering the complexity of tunneling processes in association with i...
Article
This paper introduces a holistic product model for the interactive simulation of shield tunnelling machines. The underlying product model is based on the Building Information Modelling methodology and uses the Industry Foundation Classes to classify and structure the captured data. Data from design, measurements and numerical simulation components...
Article
Full-text available
Because of the ongoing expansion of urban areas, transportation systems are being increasingly moved beneath the ground into tunnels. However, the construction of tunnels is very challenging regarding unexpected geological conditions, the protection of existing buildings from damage, and the control of financial and safety risks. During the tunnel...
Conference Paper
Underground infrastructures are becoming increasingly important components of modern traffic concepts worldwide. This includes, in particular, investigations of the stability of tunnel faces, material models for subsoil behavior, damage analysis of tunnel linings and supports as well as process-oriented simulation models for mechanized shield drivi...
Conference Paper
Artificial Intelligence (AI) has a long history in computer science and is now being applied to engineering problems in Structural Health Monitoring (SHM) that would be difficult to solve by standard numerical techniques alone. In particular, the methods of Conventional Artificial Intelligence (CAI) and Computational Intelligence (CI), coupled with...
Conference Paper
The paper presented reports on the development of a distributed simulation and optimization platform for underground engineering. The platform integrates individual software applications from all fields of underground engineering to support engineers in the design of underground constructions. This paper addresses two aspects of software integratio...
Chapter
VorbemerkungKonzept für ein interaktives Konstruktionssystem VorentwurfsmodulStrukturanalysemodulNachweismodulOptimierungsmodulKopplung der ModuleObjektorientierte Modellierung PaketdiagrammUse-Case-DiagrammKlassenmodell Komponente DesignComponentKomponente OptimizationComponentSequenzdiagrammeZustandsdiagrammeAnwendungsbeispiel: Interaktive Optimi...
Conference Paper
Full-text available
When creating computational models of engineering structures, it can be very helpful to have insights into the behavior and composition of the physical system. Such insights can be gleaned using data mining techniques, where often unexpected relationships between physical quantities can be made evident. In the context of an agent-based research pro...
Article
Full-text available
Although there are some good reasons to design engineering software as a stand-alone application for a single computer, there are also numerous possibilities for creating distributed engineering applications, in particular using the Internet. This paper presents some typical scenarios how engineering applications can benefit from including network...
Conference Paper
The widespread availability of the Internet has the potential to fundamentally change the way we will use computer software in the future. Instead of placing application software as such in the center of attention, the focus can shift to the software services provided by executing applications, as witnessed by the increasing number of application s...
Article
Structural optimization encompasses much more than just solving numerical optimization problems. As computer capabilities increase, the entire process of modeling structural optimization problems must be considered. In particular, the creation, transformation and evaluation of the underlying concepts, rather than just brute numerical power, are bec...
Chapter
Eine fundierte DV-Ausbildung im Bauingenieurbereich — wie auch in den übrigen Ingenieurdisziplinen — ist unerläßlich angesichts der Bedeutung von Rechnern in der Praxis. Wenn aber von einer DV-Verarbeitung im Ingenieurbereich die Rede ist, sind meistens “klassische”, d.h. numerisch-orientierte Aufgabenfelder gemeint. Hierzu gehören Berechnungsverfa...
Article
Full-text available
In practical engineering design, it is essen- tial to have access to a variety of different op- timization strategies. In this paper, a concept is presented which offers a unified interface to vari- ous, existing optimization packages. Through the use of the CORBA technology, this package can be used in a heterogenous client-server environ- ment. B...
Article
Full-text available
Interval analysis extends the concept of computing with real numbers to computing with real intervals. As a consequence, some interesting properties appear, such as the delivery of guaranteed results or conrmed global values. The former property is given in the sense that unknown numerical values are in known to lie in a certain interval. The latte...
Article
As part of the European Research Project TUNCONSTRUCT, a real-time data evalua- tion software for tunnel boring machines has been developed by the Institute of Computational En- gineering at the Ruhr-University Bochum. The software combines fuzzy logic methods and rule based systems to generate optimized machine control parameters with regard to th...
Article
Full-text available
Fuzzy logic can be used to assist engineers in the process of making decisions, selecting from a range of options or classifying objects, besides being used in the domain of steering and control. In this paper, the fundamentals of fuzzy logic as applied to engineering problems is presented using an example from steering and control. Two examples th...

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