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Control Algorithm

Led by Braxton Herold

Despite how nerdy they are, control algorithms are one of the most important parts of any TVC rocket.

What is Active Control?

Control Theory Linear Representation-16_

Before jumping to a solution, we need to define the problem. To understand active control in a simple way, let's use an example of driving a car. Imagine a car is 20 meters away from the only shady parking spot in a parking lot. What's the fastest way to reach the parking spot? You might think accelerating until you get there is the quickest method. However, this means you will only begin to slow down after passing the parking spot and will overshoot it. The key is to understand that any acceleration you do over time integrates, or adds, to result in your velocity, which is itself integrated into distance traveled. Active control is the challenge of creating logic that tells you when to speed up or slow down (and by how much) based on your current situation.

Proportional-Derivative (PD) Control

Ares V3 uses a PD control algorithm, which is a simpler version of the common PID algorithm. PD balances the need to get to the setpoint and the need to slow down before hitting it.

"Good enough ... it'll be fine."

©2024 by Braxton Herold.

Cinematic launch photos by Arman Kasnavi

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