Modern Machinery (MM) Science Journal, July 2011

STRATEGIES FOR AN ELEVATOR DISPATCHER SYSTEM

Jana Horejsi, Petr Horejsi, Muhammad Latif
Keywords: ARENA | Simulation | Discrete Event Simulation | Elevator Dispatcher System | Elevator

To provide for an efficient elevator system, a variety of diverse and sometimes conflicting constraints have to be solved. This paper focuses on using discrete event simulation as a means to model and explore elevator dispatching strategies. Arena simulation software has been used as a test-bed for model building, simulation and some experimentation. Model building using Arena building blocks are (…)

JOB SHOP SCHEDULING IN MECHANICAL ENGINEERING

Pavel Kopecek
Keywords: Discrete Optimization | Direct Control of Production in Mechanical Engineering | ERP | Production Process | Scheduling

Common ERP systems do not solve the support for workshop management. This paper shows why and under what conditions computer support for workshop schedules is necessary. Demands on the quality of operation plans, factors having an influence on the scheduling process and criteria for selection of appropriate operations are discussed. A verification program was developed for testing the proposed hypo (…)

THE PROPERTIES OF ELECTROLYTICALLY DEPOSITED COMPOSITE ZN-PTFE COATINGS

P. Drasnar, J. Kudlacek, V. Kreibich, Vojtech Kracmar, Miroslav Vales
Keywords: technological process | electroplating | Composite coating | PTFE | zinc | galvanization

The requirements for the properties of the surface of highly stressed components are getting increasingly higher so the pure metal coatings are not sufficient any more. The research and development makes it possible to use new alloy or composite coatings which extend the possibilities of surface treatment applications. This study looks at the composite, electrolytically deposited Zn-PTFE coatings (…)

WELDABILITY TEST OF PRECIPITATION HARDENABLE ALUMINIUM ALLOY EN AW 6082 T6

L. Kolarik, K. Kovanda, M. Valova, P. Vondrous, J. Dunovsky
Keywords: GMAW | GTAW | Weldability | Fishbone Test | Houldcroft Test | Aluminium Alloys

The article presents results of weldability test of precipitation hardenable aluminium alloys used often for rolling stock production. The research was conducted at Department of Manufacturing Technology, Faculty of Mechanical Engineering, Czech Technical University in Prague. The used material was EN AW 6082 T6. The weldability by GTAW and GMAW welding methods was assessed by Houldcroft`s weldabil (…)