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ISSN 0171-2772
Modern production systems have become more flexible and agile. For them, a suitable control and planning method is needed. Agent-based systems offer the required characteristics. The contributions of these work are a remodeling of the Shifting Bottleneck heuristic to include limited buffers, the development of a decentralized multi-agent system for production planning, and the adaptation of the heuristic to the agent system. It concludes with evaluations of real-world production systems.
Umfang: IX, 187 S.
Preis: 48.00 €
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Inhalt dieser Arbeit ist die Entwicklung eines Lokalisierungssystems, welches mehreren fahrerlosen Transportfahrzeugen ermöglicht lokal hochflexibel und frei navigieren zu können. Das deckenmontierte Sensorsystem erkennt und analysiert Objekte innerhalb des Sichtfeldes. Die ermittelten Eigenschaften aller Objekte werden über eine Schnittstelle zur Verfügung gestellt und ermöglichen es Fahrzeugen, sich selbst zu identifizieren und frei zu navigieren, ohne einen am Fahrzeug montierten Sensor.
The content of this work is the development of a localization system, which enables several driverless transport vehicles to navigate locally in a highly flexible and free way. The ceiling mounted sensor system detects and analyzes objects within the field of view. The detected properties of all objects are made available via an interface and enable vehicles to identify themselves and navigate freely without a sensor mounted on the vehicle.
Umfang: IX, 187 S.
Preis: 45.00 €
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Bridge cranes are widely used as discontinuous material handling systems in industrial environments. The so-called crane bridge plays a central role in the overall construction. With increasing span widths and load capacities, the dimensions of the crane bridge also increase. The core of this work is the design and optimization of a new type of bridge crane system, which consists of individual segments and is eccentrically pretensioned by a tensile member.
Umfang: XVIII, 214 S.
Preis: 53.00 €
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Order fulfilment systems are forced to manage a volatile customer demand while meeting customer-required short order deadlines. To handle these challenges, we introduce the Strategy of Levelled Order Release (LOR) for workload balancing over time. The contributions of this work are (1) the workload balancing concept LOR, (2) a discrete-time Markov chain for performance analysis, and (3) an algorithm for capacity planning under performance constraints in order fulfilment systems with LOR.
Umfang: XII, 261 S.
Preis: 43.00 €
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In dieser Arbeit werden Ursachen und Folgen von Volatilität in den regelmäßigen Abläufen eines logistischen Netzwerks untersucht. Auf der Grundlage der Erkenntnisse wird ein Konzept zur kooperativen Planung und Steuerung mittels Softwareagenten vorgeschlagen und im Vergleich zu einer Ablaufsteuerung nach dem FIFO-Prinzip in einer Simulationsumgebung evaluiert. Der Fokus liegt dabei auf der Untersuchung der Wirksamkeit einer dynamischen Dringlichkeitsbewertung zur Priorisierung von Aufträgen.
This work examines the causes and consequences of volatility in the regular processes of a logistic network. On the basis of the findings, a concept for cooperative planning and control using software agents is proposed and evaluated in a simulation environment in comparison to a sequence control based on the FIFO principle. The focus is on examining the effectiveness of a dynamic urgency assessment for prioritizing orders.
Umfang: XXI, 215 S.
Preis: 41.00 €
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In this work, we present a modelling approach in order to depict service rules holistically. The developed model is called multi-queue system with multiple departure streams (MQSMDS). The MQSMDS is modelled as a discrete time Markov chain. On the basis of a numerical study, the system characteristics are evaluated. The results of this work enable a rapid and low-cost analysis of material handling and production systems as well as a fast and easy identification of suitable service rules.
Umfang: X, 250 S.
Preis: €44.00 | £40.00 | $77.00
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Fahrerlose Transportsysteme (FTS) sind eine flexible Alternative zu starrer Fördertechnik. In dieser Arbeit werden Probleme und Lösungsansätze zur Gestaltung von FTS in Form von Entwurfsmustern aufgezeigt. Die Muster betrachten die Themen Modularität, Sicherheit, Mensch-Maschine-Interaktion, Navigation und dezentrale Steuerung. Sie dienen einerseits der Strukturierung von Lösungsansätzen und sind andererseits ein Hilfsmittel zur Entwicklung Fahrerloser Transportsysteme.
Automated guided vehicles (AGVs) are a flexible alternative to rigid conveyor technology. Based on challenges of AGVs, this work presents corresponding design patterns. The patterns consider the topics modularity, safety, human-machine interaction, navigation and decentralized control. On the one hand, they serve to structure solutions and on the other hand, they facilitate the development process of automated guided vehicles.
Umfang: VII, 155 S.
Preis: €40.00 | £37.00 | $70.00
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A general analytical travel time model for the quadruple command cycle in double deep storage systems with a dual capacity load handling device is formulated and validated by means of a simulation model. Various routing and sequencing strategies are composed. A simulation model is used to compare strategies for differnt AS/RS configurations and settings to assess them in consideration of real-world cases. For selected strategies, analytical formulations are derived.
Umfang: IX, 273 S.
Preis: €43.00 | £40.00 | $76.00
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Lean management describes a set of methods combined with a management philosophy which aims at eliminating waste in logistics processes. In production logistics, lean is already widespread and applied successfully. Research has shown that lean also works in a warehousing environment. In transport logistics, lean is still at a low level of maturity in both research and practice. This work contributes to closing this gap by introducing Heijunka leveling to transport logistics.
Umfang: XXIV, 222 S.
Preis: €42.00 | £39.00 | $74.00
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Shuttle-based storage and retrieval systems (SBS/RSs) are an important part of today‘s warehouses. In this work, a new approach is developed that can be applied to model different configurations of SBS/RSs. The approach is based on the modeling of SBS/RSs as discrete-time open queueing networks and yields the complete probability distributions of the performance measures.
Umfang: IX, 225 S.
Preis: €41.00 | £38.00 | $72.00
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