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2025-07-07T21:36:51Z

Meco Control Parameters

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	~~= Meco Control Parameters =~~

	Control parameters allow dynamic control of system behavior during simulation. They enable time-varying inputs, operational control, and system optimization of rocket engine performance.		Control parameters allow dynamic control of system behavior during simulation. They enable time-varying inputs, operational control, and system optimization of rocket engine performance.

Admin: Created page with "= Meco Control Parameters = Control parameters allow dynamic control of system behavior during simulation. They enable time-varying inputs, operational control, and system optimization of rocket engine performance. == Overview == The Meco Rocket Simulator supports 2 control parameter types: {| class="wikitable" |- ! Parameter Type !! Behavior !! Applications !! Key Features |- | ControlParameter || Constant value || Fixed operating points || Simple constant control |..."

2025-07-07T21:20:24Z

Created page with "= Meco Control Parameters = Control parameters allow dynamic control of system behavior during simulation. They enable time-varying inputs, operational control, and system optimization of rocket engine performance. == Overview == The Meco Rocket Simulator supports 2 control parameter types: {| class="wikitable" |- ! Parameter Type !! Behavior !! Applications !! Key Features |- | ControlParameter || Constant value || Fixed operating points || Simple constant control |..."

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= Meco Control Parameters =

Control parameters allow dynamic control of system behavior during simulation. They enable time-varying inputs, operational control, and system optimization of rocket engine performance.

== Overview ==

The Meco Rocket Simulator supports 2 control parameter types:

{| class="wikitable"
|-
! Parameter Type !! Behavior !! Applications !! Key Features
|-
| ControlParameter || Constant value || Fixed operating points || Simple constant control
|-
| ControlParameterTransition || Time-varying || Startup, throttling, shutdown || Smooth transitions
|}

== Control Target Categories ==

Control parameters can target different component categories:

{| class="wikitable"
|-
! Category !! ID !! Target Components !! Available Ports
|-
| NODE || 1 || All node types || "cr" (O/F ratio), "cp"/"c" (pressure)
|-
| BRANCH || 2 || Valve branches || Valve position/opening
|-
| MACHINERY || 3 || All machinery || Speed, power, efficiency modifiers
|}

== ControlParameter ==

=== Overview ===
* '''Type:''' <code>ControlParameter</code>
* '''Purpose:''' Constant control value throughout simulation
* '''Applications:''' Fixed operating conditions, design point analysis

=== Parameters ===
* '''Basic Parameters:'''
** <code>name</code> - Parameter name (string)
** <code>value</code> - Control value (double)

* '''Target Parameters:'''
** <code>component_category</code> - Target category: 1=NODE, 2=BRANCH, 3=MACHINERY (integer)
** <code>component</code> - Target component name (string)
** <code>component_port</code> - Target port identifier (string, NODE category only)

=== Node Control Ports ===
For <code>component_category = 1</code> (NODE):
* '''cr''' - Oxidizer/Fuel ratio control (for gas generators)
* '''cp''' or '''c''' - Pressure control (for boundary conditions)

=== Example JSON ===
<pre>
{
"name": "GG O/F Ratio",
"category": 6,
"type": "ControlParameter",
"value": 2.5,
"component_category": 1,
"component": "Gas Generator",
"component_port": "cr"
}
</pre>

<pre>
{
"name": "Main Valve Position",
"category": 6,
"type": "ControlParameter",
"value": 0.85,
"component_category": 2,
"component": "Main Control Valve"
}
</pre>

== ControlParameterTransition ==

=== Overview ===
* '''Type:''' <code>ControlParameterTransition</code>
* '''Purpose:''' Time-varying control with smooth transitions between values
* '''Applications:''' Engine startup, throttling sequences, shutdown procedures

=== Parameters ===
* '''Basic Parameters:'''
** <code>name</code> - Parameter name (string)
** <code>startValue</code> - Initial value (double)
** <code>endValue</code> - Final value (double)
** <code>midpoint</code> - Transition midpoint time (double)
** <code>width</code> - Transition width/duration (double)

* '''Target Parameters:'''
** <code>component_category</code> - Target category: 1=NODE, 2=BRANCH, 3=MACHINERY (integer)
** <code>component</code> - Target component name (string)
** <code>component_port</code> - Target port identifier (string, NODE category only)

=== Transition Behavior ===
The parameter value smoothly transitions from <code>startValue</code> to <code>endValue</code>:
* '''Before Transition:''' Value = startValue
* '''During Transition:''' Smooth interpolation over width period centered on midpoint
* '''After Transition:''' Value = endValue

=== Timing Guidelines ===
* '''Midpoint:''' Center time of transition (simulation time units)
* '''Width:''' Total duration of transition
* '''Start Time:''' midpoint - width/2
* '''End Time:''' midpoint + width/2

=== Example JSON ===
<pre>
{
"name": "Startup Throttle",
"category": 6,
"type": "ControlParameterTransition",
"startValue": 0.0,
"endValue": 1.0,
"midpoint": 2.0,
"width": 1.0,
"component_category": 3,
"component": "Main Turbine"
}
</pre>

== Control Applications ==

=== Gas Generator Control ===
Oxidizer/Fuel ratio control for combustion optimization:

==== O/F Ratio Control ====
* '''Target:''' Gas generator nodes
* '''Port:''' "cr" (combustion ratio)
* '''Range:''' Typically 1.0-4.0 for O2/H2 systems
* '''Impact:''' Affects gas temperature and turbine performance

'''Example:'''
<pre>
{
"name": "GG O/F Control",
"type": "ControlParameterTransition",
"startValue": 1.5,
"endValue": 2.8,
"midpoint": 1.0,
"width": 0.5,
"component_category": 1,
"component": "Gas Generator Head",
"component_port": "cr"
}
</pre>

=== Valve Control ===
Dynamic valve positioning for flow control:

==== Valve Position ====
* '''Target:''' BranchValve or BranchGasValve components
* '''Range:''' 0.0 (closed) to 1.0 (fully open)
* '''Impact:''' Controls flow rate and pressure drop

'''Example:'''
<pre>
{
"name": "Throttle Valve",
"type": "ControlParameterTransition",
"startValue": 0.1,
"endValue": 0.9,
"midpoint": 3.0,
"width": 2.0,
"component_category": 2,
"component": "Main Throttle Valve"
}
</pre>

=== Machinery Control ===
Control of rotating machinery parameters:

==== Speed Control ====
* '''Target:''' Pump or turbine components
* '''Applications:''' Speed governors, power control
* '''Range:''' Depends on machinery design limits

==== Power Control ====
* '''Target:''' Turbine components
* '''Applications:''' Power extraction control
* '''Range:''' 0.0 (no power) to 1.0 (full power)

'''Example:'''
<pre>
{
"name": "Turbine Power",
"type": "ControlParameter",
"value": 0.95,
"component_category": 3,
"component": "Main Turbine"
}
</pre>

=== Pressure Control ===
Boundary condition pressure control:

==== Inlet Pressure ====
* '''Target:''' Inlet nodes (NodeInlet, NodeGasInlet)
* '''Port:''' "cp" or "c"
* '''Applications:''' Tank pressure, feed system pressure
* '''Units:''' Pascals (Pa)

'''Example:'''
<pre>
{
"name": "Tank Pressure",
"type": "ControlParameter",
"value": 2500000,
"component_category": 1,
"component": "LOX Tank Inlet",
"component_port": "cp"
}
</pre>

== Engine Operation Sequences ==

=== Startup Sequence ===
Typical rocket engine startup control sequence:

# '''Pre-ignition:''' Set initial valve positions and pressures
# '''Ignition:''' Initiate gas generator or igniter
# '''Ramp-up:''' Gradually increase O/F ratio and valve openings
# '''Mainstage:''' Reach nominal operating conditions

'''Example Control Timeline:'''
<pre>
Time 0-1s: Valve positions: 0.0 → 0.2
Time 1-2s: O/F ratio: 1.0 → 2.5
Time 2-3s: Throttle valve: 0.2 → 0.9
Time 3s+: Steady-state operation
</pre>

=== Throttling Control ===
Dynamic thrust control during flight:

# '''Throttle Command:''' External control input
# '''Valve Response:''' Adjust main valve positions
# '''O/F Adjustment:''' Maintain optimal mixture ratio
# '''Pressure Control:''' Adjust feed system pressures

=== Shutdown Sequence ===
Safe engine shutdown procedure:

# '''Throttle Down:''' Reduce valve openings
# '''O/F Reduction:''' Lower gas generator power
# '''Valve Closure:''' Sequential valve closing
# '''Cutoff:''' Complete propellant cutoff

== Design Guidelines ==

=== Transition Timing ===
* '''Smooth Transitions:''' Use adequate width to avoid abrupt changes
* '''System Response:''' Consider system time constants
* '''Stability:''' Avoid rapid changes that cause instability
* '''Physical Limits:''' Respect actuator speed and authority limits

=== Control Authority ===
* '''Full Range:''' Ensure control covers full operating range
* '''Margins:''' Provide control margin for off-nominal conditions
* '''Redundancy:''' Consider backup control methods
* '''Failure Modes:''' Design for safe failure positions

=== Parameter Coordination ===
* '''Sequence Coordination:''' Coordinate multiple parameter changes
* '''Interdependencies:''' Consider parameter interactions
* '''Optimization:''' Optimize control for performance and safety
* '''Verification:''' Validate control sequences through simulation

== Integration with Simulation ==

=== Time Integration ===
* '''Control updates:''' Applied at each simulation time step
* '''Interpolation:''' Smooth interpolation between control points
* '''Event handling:''' Discrete events trigger control changes
* '''Real-time:''' Support for real-time control applications

=== Feedback Control ===
* '''Sensor Input:''' Use simulation outputs as control feedback
* '''Closed Loop:''' Implement feedback control algorithms
* '''Stability:''' Ensure control system stability
* '''Performance:''' Optimize control for desired response

== Common Control Strategies ==

=== Open Loop Control ===
* '''Pre-programmed:''' Fixed control sequences
* '''Simple:''' Easy to implement and understand
* '''Robust:''' Not sensitive to measurement errors
* '''Applications:''' Startup sequences, nominal operations

=== Closed Loop Control ===
* '''Feedback:''' Uses system response for control decisions
* '''Adaptive:''' Responds to off-nominal conditions
* '''Complex:''' Requires control system design
* '''Applications:''' Thrust control, mixture ratio control

=== Feed-Forward Control ===
* '''Predictive:''' Anticipates system needs
* '''Fast Response:''' No delay from feedback
* '''Model-Based:''' Requires accurate system model
* '''Applications:''' Disturbance rejection, optimization

== See Also ==

* [[Meco Rocket Simulator Components Overview|Main Components Overview]]
* [[Meco Nodes|Node Components]]
* [[Meco Branches|Branch Components]]
* [[Meco Machinery|Machinery Components]]
* Control Systems Engineering
* Rocket Engine Control Systems
* Dynamic Simulation Methods

[[Category:Meco Components]]
[[Category:Rocket Simulation]]
[[Category:Control Systems]]

Meco Control Parameters - Revision history

Admin: /* Meco Control Parameters */