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Thrust Vector Control
 
TVC comps
TVC components on the Thrust Cone
The Thrust Vector Control (TVC) subsystem has to lock the J-2X engine in place during First Stage boost and then has to steer the vehicle during Upper Stage powered flight. The steering is accomplished by pushing and pulling on the rocket engine’s nozzle, where hot gases emerge to provide thrust. The nozzle is controlled by two actuators located 90 degrees apart, whose positions are commanded by flight computers located in the Upper Stage’s Instrument Unit. Hydraulic locks in the actuators hold the engine in place during the boost phase.
The actuators are powered by the two turbine pump assemblies that are driven by hydrogen gas from the Main Propulsion System. The hydraulic power from the turbine pump assembly is conditioned and delivered to the actuators by hydraulic systems. The TVC power system is single fault tolerant since only one assembly is needed to power both actuators.
   
 

Click on the image to the left to view a short video that shows the engine nozzle moving, or "gimbaling," which is what the TVC system does.

 

  TVC TPA/TPA Architecture
 



TVC Animation


Thrust Vector Control animation (.exe)

 

Directions for running the file:

Click the Pre-Launch button to see what the TVC system will be doing during pre-launch countdown at the pad. You will see the TVC circulation pumps circulating the TVC hydraulic fluid to keep it from freezing when the Ares I liquid oxygen tank is being filled. The extremely cold liquid oxygen tank is near the hydraulic lines, just on the other side of the surface on which TVC hardware is mounted.

To see what the TVC system will be doing during Ares I Upper Stage Ascent, click the US Ascent button. This will show hydrogen gas flowing to the turbine pump assemblies, the pump starting to run, the fluid circulating in the hydraulic system and then flowing to the actuators, which results in actuator motion.

Click the Fault Correction button to see one example of how the TVC system responds to a failure. This will show the TVC system operating nominally (each turbine pump assembly and hydraulic system operates a single actuator). Then, you will see the failure of a turbine pump assembly and the shutdown of hydraulic system A. The turbine pump assembly on hydraulic system B will show increased hydrogen flow and increased pump motion and the hydraulic system B will then operate both actuators.

Note: To go from one scenario to another, you must hit Reset in between clicking the scenario buttons.

Note: The Boost Ascent Button does not do anything visually since TVC is not active in Boost Ascent.

Note: The Pause button can be used to freeze the animation at anytime.

When finished, click the Quit button.

 

 

 

Contact at NASA Glenn Research Center
Lead, Upper Stage, Thrust Vector Control: David T. Frate
Space Flight Systems Directorate / Launch Systems Project Office
216-433-8329

 
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