ABSTRACT
A multi-level technical data model and a method to assess the throughput of aggregated production units is presented. A generic template guides the application of recursive aggregation operators which are assumed to be defined by a human expert. This approach aims to support the macro-evaluation of performances to be expected from networked complex manufacturing units.
Key words :Global Manufacturing, Data Aggregation, Production Networks, Flow Assessment
ABSTRACT
We consider the problem of minimizing makespan in a no-wait flowshop with three machines. A lot consists of many identical items of the same product. Lot streaming (lot sizing) is the process of creating sublets to move the completed portion of a production sublet to downstream machines so that operations will be overlapped, for each product, we first consider the number of sublots as given, and we obtain optimal continuous-sized sublots. Some general results are proved for the general no-wait flow-shop with an arbitrary number of machines. These results are then applied to the 3- machine case, to find the optimal size sublots. Then, using this solution, and assuming there is a setup time between the transfer of batches, the optimal number of sublots is derived for the 2-machine no- wait flow-shop. For the 3-machine cases, we distinguish two situations. A closed form formula is proved in the first, and a lower bound is provided in the second.
Key words and phrases: No-wait flowshop, lot streaming, batches.
ABSTRACT
This paper describes a Non-Hall effect current transducer, which provides galvanic isolation between the input and output whilst transmitting both ac an dc signals. The current transducer is used in electronic drives and controls systems where the special features of digital output and lack of Hall effect devices coupled with symmetrical magnetic structure is of benefit. The new design uses a ferrite core without an air gap, proving a limit cycle for the transmission of input signals. The limit cycle supports the production of a digital output signal.
Key Words: Transducers, Limit Cycle, Current Transducer, Digital Current Transducer
ABSTRACT
The technical characteristics, advantages and applications of an automated optoelectronic measuring system for inspection of gas-turbine engine (GTE) element parameters designed by "Optel" company, State Aviation University of Ufa are presented in this paper. The measuring apparatus can be applied for research in industry. Its main advantages are non-contact and high scanning speed.
Key words. GTE, inspection, optoelectronic, measurements, software.
ABSTRACT
In this paperwork, based on the model of dual Hall devices, it is analysed the operation, and are established the main characteristics for two magnetotransistors structures, realised in the MOS and the bipolar integrated circuits technology. Using numerical simulation it is emphasized the way in which the choise of its geometry and material features, allow the obtaining of high performance magnetic sensors. There are also presented and described the original electrical diagrams of the transducers which contain such sensors, proposing possible applications in naval installation.
Key Words: double-collector magnetotransistors, offset equivalent magnetic induction, noise equivalent magnetic induction, signal-to noise ratio, detection limit.