In this paper multi-objective genetic algorithms were employed for Pareto approach optimization of turboprop engines. The considered objective functions are used to maximize the specific thrust, propulsive efficiency, thermal efficiency, propeller efficiency and minimize the thrust specific fuel consumption. These objectives are usually conflicting with each other. The design variables consist ...

The purpose of this paper is to explore and define an adequate numerical setting for the computation aerodynamic performances wind turbines various shapes sizes, which offers possibility choosing a suitable approach minimal complexity future research. Here, mechanical power, thrust, power coefficient, thrust pressure distribution along blade, relative velocity contoure, at different speeds stre...

This paper presents experiments with a new algorithm for the unseady (tranient) thrust control bladed-propeller marine thrusters. Comparative experiments over a wide range of unsteady operating conditions with three different thrust control algorithms demonstrate the model-based control algorithm to offer transient thrust-control performance superior to that of its non-model-based counterpart. ...

Understanding the folding style of a fold-thrust belt is crucial to understand the nature and structural history of structures that may trap natural resources within the belt. In this research, the geometry and mechanism of a number of fault-related folds has been investigated based on field data and satellite image interpretations. The main study areas are: the Sohrevard and Ushtaniyan anticli...

Linear flux-switching permanent magnetic (LFSPM) machines are good choices for long stroke applications. These machines deliver high thrust force density in addition to the machine structure where permanent magnetics (PMs) and windings are all on the short mover. For LFSPM machines, their performance is always affected by big thrust force ripple. In this paper, for two C-core LFSPM machines of ...

In the maritime industry, propellers are most commonly used form of propulsion and core to optimum performance a ship. As marine have complicated geometries, flow around propeller is also complicated. Generally, characteristics determined analysed by experiments like open water self-propulsion scale model tests which costly time-consuming at initial design stage. this study, CFD simulations wer...

Surface-piercing propellers have been widely used in light and high-speed vessels because of their superior performance. One of the major steps in propeller selection algorithm is the determination of thrust as well as torque hydrodynamic coefficients. For the purpose of simplifying design and selection procedure, some relations are presented for determining hydrodynamic coefficients in some st...

CO2 refrigerant with a high operating pressure has a large difference between the suction and discharge pressures in compressors. Because of a load increase, the high performance and high reliability of compressors are required. Compared to the scroll compressor employing the conventional refrigerant, the thrust load increases in the CO2 scroll compressor. Therefore the design of thrust bearing...

The influence of deformation on aerodynamic characteristics is studied in this paper. To study the influences of deformation magnitude and range separately, a kind of twopart flapping wing model is designed, which separates the deformation magnitude and range, and makes the measurement of deformation easier. A series of wind-tunnel experiments are carried out to explore the influence. The exper...