Path Design Method Research Articles

Investigation of modification design of the fan stage in axial compressor

The S2 flow path design method of the transonic compressor is used to design the one stage fan in order to replace the original designed blade cascade which has two-stage transonic fan rotors. In the modification design, the camber line is parameterized by a quartic polynomial curve and the thickness distribution of the blade profile is controlled by the double-thrice polynomial. Therefore, the inlet flow has been pre-compressed and the location and intensity of the shock wave at supersonic area have been controlled in order to let the new blade profiles have better aerodynamic performance. The computational results show that the new single stage fan rotor increases the efficiency by two percent at the design condition and the total pressure ratio is slightly higher than that of the original design. At the same time, it also meets the mass flow rate and the geometrical size requirements for the modification design.

Coupled-layer type waveband path design method corresponding to traffic demand fluctuation

The establishment of all optical WDM network architecture suitable for applications with large capacity, long holding time and real time, such as video transmission, has important technical issues. However, most of the conventional system assumes static traffic and lacks the flexibility to unexpected change of traffic demand. Hence, the enhancement for dynamic traffic must be provided on the network design. In this paper, we propose a coupled-layer waveband routed network architecture to accommodate dynamic traffic changes. Assuming an environment without a wavelength converter, our coupled-layer waveband path design method is applied to several network topologies to enable an evaluation of its performance. The effectiveness and feasibility of this method were confirmed in terms of the number of required wavelengths and the blocking probability.

A Guide Path Network Design Method for Automated Guided Vehicle Systems Using Q-Learning.

In this paper, a guide path design method is suggested for automated guided vehicle systems using Q-learning technique. Numerous manufacturing companies have recognized various advantages of Automated Guided Vehicle System (AGVS) for material handling. These advantages include the flexibility in transportation, the improved space utilization, and the lead-time reduction. With the rapid advance of the state of art technology for AGVS, the application of AGVS to automated manufacturing systems has been more popular than ever before. However, the design of the guide-path network has been considered as one of difficulties in the application of AGVS. By applying the Q-learning technique, it is possible to consider the traffic congestion at intersections or at pickup/delivery stations, and interference among vehicles on bi-directional path segments. It is discussed how the Q-learning technique can be applied to the guide path design problem. A numerical experiment was performed to evaluate the performance of the rules obtained from the learning process for the network design. The result of this research is compared with those by previous studies.

Virtual path and link capacity design for ATM networks

A path and link capacity design method for asynchronous transfer mode (ATM) networks using statistical multiplexing of cells is proposed. By developing the design method, the statistical cell multiplexing effect can be exploited to significantly reduce required network resources. The necessary design procedures are identified. A simple and effective policing mechanism is proposed. An analytical method for the evaluation of cell multiplexing characteristics using declared parameters is provided. Path and link capacity design algorithms that use these techniques are proposed. The effectiveness of the proposed design procedure is confirmed by comparing analytical results to those from a computer simulation.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>