Transfer cars are utilized in flexible manufacturing and distribution systems as material handling equipment with one or more loading devices. To support early systems design decisions, an analytical method is developed for cycle time calculation of the transfer car. Both the expected value and variances of cycle times reflecting the production program and technical performance data of the transfer car are derived and compared with simulation data to verify the approach. With these results the system is further investigated in a queuing network model to calculate logistic measures such as throughput, flow time or machine utilization for a specific data set. As the results depend to a great deal from technical performance data, a drive optimization of the transfer car is presented. The drive system to move pallet loads consists of high performance servo-drives moving the transfer car with a tooth belt operating at substantial speed and accelerations. However, a dynamic operation results in unfavorable oscillations when the transfer car approaches its final destination. To avoid time losses special acceleration profiles are presented and compared to a high performance control method. The main objective of this paper is to provide a flexible solution connecting versatile workstations to a loading/unloading station serving for the setup of tooling, fixtures, raw material and finished goods. The transfer car is guided by rails and performs both I/O travel and intermediate travel between stations. Machine loading is specified through the sequence of manufacturing operations and flexible tooling of the stations. It was shown that both cycle time calculations and dynamic behavior of transfer car motions determine positioning times and throughput with variable payloads. A combined calculation is necessary to preestimate cycle times and to design proper trajectory data of transfer car motions.


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    Title :

    Cycle time and drive optimization of a high performance transfer car


    Additional title:

    Zykluszeit und Antriebsoptimierung eines Hochleistungs-Transferwagens


    Contributors:


    Publication date :

    2008


    Size :

    12 Seiten, 14 Bilder, 8 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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