Abstract
This study investigated an approach to reduce the number of actuators used for internal pressure control and thruster allocation in a multinozzle solid propulsion system. In the proposed design, the throat areas of four divert nozzles are controlled by only three actuators, and chamber pressure maintenance and thrust distribution are achieved by controlling the throat areas. Using the proposed actuator set, thrust allocation can be accomplished in a more efficient way than when independent actuators are employed for each nozzle.
Highlights
Solid propulsion systems have been widely studied and applied in diverse applications, because their design is simple and they have a shorter response time than liquid propulsion systems
This paper proposes a novel pintle actuator mechanism for four divert control system (DCS) nozzles, which has three actuator components, rather than the conventional four
If the amount of fluid decreases, all four pistons will move outward, and they will be pushed inward if the fluid is increased. This will affect the total nozzle throat area, which is important for controlling the chamber pressure, there will be no change in thrust, because all of the pistons
Summary
Solid propulsion systems have been widely studied and applied in diverse applications, because their design is simple and they have a shorter response time than liquid propulsion systems. This approach is intuitive and allows each nozzle throat area to be controlled independently. Because they share the incompressible fluid in the bottom of each actuator, the uncontrolled actuators are automatically moved backward when one or two of the pintle actuators are moved by a control command In this way, the ratio of total nozzle throat area to chamber pressure will remain constant when the nozzle throat area is varied linearly by the pintle actuator movement. While it is necessary to employ a thrust distribution algorithm when each pintle is controlled independently, because there are multiple ways to distribute thrust, with the linear throat area change strategy proposed in this study the most efficient distribution algorithm is achieved naturally by the incompressible fluid. The proposed actuator mechanism idea is verified with simulation studies
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