Spacecraft Performance and Trajectory Optimization Quiz

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What method is used for trajectory optimization to find the optimal command satisfying the Hamiltonian without iterative changes?

Direct method

Indirect method (correct)

Shooting method

Iterative method

What does the staging → Index ratio characterize for a system's performance?

Dry mass and mass with propellant (correct)

Fuel consumption

Precision of the orbit

Mass at liftoff

What is the primary goal of trajectory optimization?

Minimizing deviation from precision orbit

Maximizing fuel consumption

Minimizing the number of stages

Maximizing/minimizing a criterion to achieve a goal (correct)

What does the shooting method involve in trajectory optimization?

Solving a boundary value problem by reducing it to an initial value problem Signup and view all the answers

What is the primary focus of flight mechanics?

Ensuring safe separation during different flight phases Signup and view all the answers

What does the study of transient phases in flight mechanics involve?

Solving dynamic equations with perturbations Signup and view all the answers

Which phase in flight mechanics includes problems related to engine extinction and acceleration drop?

Stage separation phases Signup and view all the answers

What is a critical consideration during the micro-acceleration phase in flight mechanics?

Minimizing propellant sloshing and bubble formation Signup and view all the answers

What is a key factor in the re-entry phase as it relates to flight mechanics?

Dynamic phenomena of POGO and Sloshing Signup and view all the answers

What is a significant concern in the ground phase of flight mechanics?

Integrating and transferring stages Signup and view all the answers

Which phase in flight mechanics is most impacted by strong aerodynamic forces?

Atmospheric phase Signup and view all the answers

What does the propelled exo-atmospheric phase in flight mechanics involve after jettison?

Correcting trajectory through AOA adjustment Signup and view all the answers

What is a critical consideration during the waiting phase in flight mechanics?

Optimizing launcher efforts during transfer Signup and view all the answers

What does the ballistic phase involve at end-of-life disposal in flight mechanics?

Ensuring safe separation during different flight phases Signup and view all the answers

During the flight mechanic study, which phase starts with the end of a pseudo steady state and ends with the beginning of the next steady state?

Transient phase Signup and view all the answers

What dynamic phenomena may occur during the propelled exo-atmospheric phase after jettison?

POGO & Sloshing Signup and view all the answers

Which phase of the flight mechanic is characterized by strong aerodynamic forces and has the most impact on launcher designing?

Atmospheric phase Signup and view all the answers

What is one of the problems to analyze during the stage separation phases?

Acceleration drop (relaxation of structural load) Signup and view all the answers

What is a necessity during engine ignition in flight mechanic study?

Propellants are well positioned Signup and view all the answers

What perturbations need to be robust in flight mechanic study?

Residual thrust, Aerodynamic, friction, static & dynamic unbalance Signup and view all the answers

What are campaigns aimed at observing reentry in flight mechanic study focused on?

Improving knowledge of reentry predictive models Signup and view all the answers