Spacecraft Performance and Trajectory Optimization Quiz

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Questions and Answers

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?

<p>Solving a boundary value problem by reducing it to an initial value problem (C)</p> Signup and view all the answers

What is the primary focus of flight mechanics?

<p>Ensuring safe separation during different flight phases (D)</p> Signup and view all the answers

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

<p>Solving dynamic equations with perturbations (D)</p> Signup and view all the answers

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

<p>Stage separation phases (D)</p> Signup and view all the answers

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

<p>Minimizing propellant sloshing and bubble formation (D)</p> Signup and view all the answers

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

<p>Dynamic phenomena of POGO and Sloshing (A)</p> Signup and view all the answers

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

<p>Integrating and transferring stages (A)</p> Signup and view all the answers

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

<p>Atmospheric phase (D)</p> Signup and view all the answers

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

<p>Correcting trajectory through AOA adjustment (D)</p> Signup and view all the answers

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

<p>Optimizing launcher efforts during transfer (A)</p> Signup and view all the answers

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

<p>Ensuring safe separation during different flight phases (D)</p> 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?

<p>Transient phase (B)</p> Signup and view all the answers

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

<p>POGO &amp; Sloshing (A)</p> 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?

<p>Atmospheric phase (C)</p> Signup and view all the answers

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

<p>Acceleration drop (relaxation of structural load) (C)</p> Signup and view all the answers

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

<p>Propellants are well positioned (A)</p> Signup and view all the answers

What perturbations need to be robust in flight mechanic study?

<p>Residual thrust, Aerodynamic, friction, static &amp; dynamic unbalance (D)</p> Signup and view all the answers

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

<p>Improving knowledge of reentry predictive models (C)</p> Signup and view all the answers

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