Find Trajectory from A to B: Approaches & Solutions

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SUMMARY

The discussion centers on calculating the shortest trajectory for a spacecraft traveling from Point A to Body B, considering Body B's angular velocity (ω) and Body C's radius (r). The user outlines an initial approach using polar coordinates, where the time taken for the spacecraft to reach Body B is expressed as Δt=s/v, while the time for Body B to reach a point P is Δt=Δφ/ω. The challenge lies in expressing the distance s in terms of the angle φ, leading to a complex equation involving cosine functions. The user also contemplates the impact of gravitational forces from Body C on the trajectory, noting that the optimal path may vary based on the velocities of both Body B and the spacecraft.

PREREQUISITES
  • Understanding of angular velocity and its implications in orbital mechanics.
  • Familiarity with polar coordinates and their application in trajectory calculations.
  • Knowledge of gravitational effects on spacecraft trajectories.
  • Basic principles of kinematics, particularly relating to velocity and time.
NEXT STEPS
  • Research "Orbital Mechanics and Trajectory Optimization" for advanced trajectory planning techniques.
  • Study "Gravitational Assists in Spacecraft Navigation" to understand how gravity influences trajectories.
  • Learn about "Numerical Methods for Solving Nonlinear Equations" to tackle complex equations like the one presented.
  • Explore "Physics of Spacecraft Dynamics" to gain insights into the effects of angular velocity on spacecraft motion.
USEFUL FOR

Game developers, aerospace engineers, and physics enthusiasts interested in trajectory optimization and spacecraft navigation challenges.

VladZH
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Hello

Given:
Point A
Body B with angular velocity ω
C body with radius r
Spacecraft with constant velocity v.

We neglect the gravity of the bodies B, C

The problem:
Find the shortest trajectory for spacecraft from A to B

What approaches might be here?

How might the solution be changed if we consider the gravity of C and v would be initial velocity?
 

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Thread reopened. @VladZH -- is this problem for schoolwork? Can you show us your ideas for approaches to use on this type of problem?
 
This is problem for my video game

I tried to solve a simpler problem when we don't have the body C.

Let P(r, φ) is a point on the circle. Let s between A and P. Hence, the time for spacecraft from A to B equals Δt=s/v
The time for body B to get P is Δt=Δφ/ω. We get d/v=Δφ/ω where φ=sω/v
Now we can find φ=φB + Δφ and direct the spacecraft towards P by a straight line.

But the problem here is to express s in terms of φ. If we substitute s by this formula we get φ with cosine and φ without cosine on different sides of equation
s = √rs2+rB2-2rsrBcos(φs-φ)
And I have no idea how to solve it

Then if we consider body C I thought about kind of force that pushes the spacecraft out of straight line trajectory. Moreover there are two possible trajectories near opposite sides of body C. The optimal one depends on speeds of body B and speed of the spacecraft

Thank you
 

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