In this paper, a particular propulsion system including, liquid rocket engine, fuel and oxidizer tank and related pressurizing system, have been surveyed. The procedure is based on a nonlinear mathematical model which has been simulated in Matlab Simulation environment. In propulsion systems, identifying system performance is essential, because if we can accept ability describe the dynamic behavior of the system components in nominal and transient regimes; we can reduce the associated costs during design and development. Following, results of Propulsion system hot test are compared with model that shows acceptable accuracy of simulator code. In addition to leading research, how to use this model to identify the causes of failure is shown. Match analysis and compatibility testing, after disassembling objective observations show considerable performance model for similar applications.

By arrangement of flexure-load cell columns in the six-component test stands, the thrust vector components of force and moment of a propulsion system can be measured. In this research, the main considerations in the flexure design process of a six component test stand is introduced. Also, a Flexure with new geometric structure to take account of these considerations is proposed. Then, by using computational constrained multi-dimensional optimization of direct methods, geometrical dimensions of the flexure are calculated. In the next step, finite element analysis is carried out on designed flexure and its results are compared with results of the analytical solution. To validate the results of the theoretical solution, natural frequencies of the flexure and buckling critical loads are measured experimentally. Based on the acceptable correlation of the theoretical and experimental results, it can be said that the proposed flexure is a good choice for using in a propulsion system six - component test stand.

The purpose of this paper is to present a genetic algorithm (as a software) to optimize engine main parameters through the application of "genetic algorithm" and also introduced the new and modified thermodynamic cycles with analysing their performance. This software objective function is to achieve the highest and optimum level of 'final velocity'. In this study, the strategy of using fuel booster turbo pump and 2nd stage fuel pump is followed primarily to moderate the effect of cavitation on pumps. Although the use of booster pumps increase the weight, arise pumps' rpm and possibility to reduce the tanks pressure came with a decrease in weight of propulsion system. The developed software is applied to Russian RD-180 engine in construction of propulsion system of first stage of ATLAS IIIB LV, and experimental results have been demonstrating the improvement of engine performance which results from a multi-variable sensitivity study on a staged-combustion engine will be highlighted. This algorithm is under the limitation of constraints to control the critical variation of combustion pressure, turbine rpm, and pumps cavitation margin and turbine temperature. Results show that, supply flow rate of gas generation from 2nd stage of fuel pump and divide flow rate of exhaust of fuel booster turbine to 2nd stage of fuel pump and combustion chamber, will increase the final velocity of launch vehicle.

This research discusses the effect of simultaneous usage of Propellant Utilization (PU) system and Flight Apparent Velocity Regulation (AVR) system. These systems were used for sending OBC commands to engine for adapting the engine working regime with flight conditions and fame to active control systems. Each of the PU and AVR systems has an effective role in access to final parameters such as mass and velocity at the end of active phase and simultaneous usage of these systems leads to increased range accuracy and payload mass. We study these effects on final parameters in this paper. Therefore, with dynamic simulation of liquid propellant engine during active phase in flight simulator, sending commands of these systems to change the engine working regime are provided. For a specific mission, results show that using the PU, range increased and presence of AVR is assisted to reach this range in front of disturbance during the flight. Another important result of this research is the payload mass increased for a specific mission with simultaneous usage of PU and AVR systems.