In a multi stage configuration these thrusters can be used for intermittent flight which can decrease the energetic cost of locomotion. In particular we focus on the fabrication method and characterization of multistage micro thrusters with a diameter of 3mm and 6.4mm. We demonstrate a sustained ...
A.several rockets which are separated from each otherB.a single rocket with enough fuelC.the booster which is the biggest and can lift the whole rocket from the groundD.a rocket with several parts, and each of which can help to push the spaceship into the space ...
Pournelle goes on to mention that multi stage rockets make rocket designers subconsciously think of spacecraft as "ammunition" instead of as "aircraft", that is, disposable as opposed to reusable. By using staging, the mass ratio of the rocket as a whole can be above 15, even though the ...
Structure of the 7 stage coilgun, the electromagnetic simulation, the mechanical model, and a picture of the constructed system. Full size image Cascading multi-stages requires careful timing of the current pulses. Therefore, a parameter sweep of the delay between the current pulses was carried out...
Jenkin also performed trade studies for GEO transfers that use a combined chemical-electric stage [58]. He used trajectory optimization to maximize GEO-insertion mass, and determined trends among various mission and system parameters, such as the elliptical orbit for the start of the EP phase, ...
Tsuchiya, T., Mori, T.: Optimal Conceptual Design of Two-Stage Reusable Rocket Vehicles including Trajectory Optimization. Journal of Spacecrafts and Rockets 41 (2004) Google Scholar Parsopoulos, K.E., Vrahatis, M.N.: Particle Swarm Optimization Method for Constrained Optimization Problems. Unive...
In this paper a 3-D computational methodology for multistage turbomachinery lows is developed, validated, and applied in analyzing the reduced-massflow-rate operation of a 4-stage turbine. The flow is modelled hy the 3-D Favre-Reynolds-averagedNavier-Stokes equations using the Launder-Sharma near...
Mars ascent-stage design utilizing nuclear propulsion The majority of NASA manned Mars exploration studies undertaken over the past three decades have advocated high-performance nuclear thermal propulsion syst... BB Donahue - 《Journal of Spacecraft & Rockets》 被引量: 31发表: 1995年 Mars Pathfinder...
The ESF scenario proposed in stage 1 (Section VTFFTB development phase 1) was simulated again in the multi-constellation version VTFFTB. Ionospheric measurements (TEC, Ne, and effective S4) using both GPS and Galileo data were taken in HIL simulations. The cases of using L1 and L2 GPS signa...
The process of water entry is an important stage for a vehicle to transit from aerial trajectory to underwater trajectory, accompanied by complex flow phenomena such as large deformation of the free surface, phase change, and multi-phase mixing and so on. The water entry is widespread in natur...