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2025-07-07T21:37:37Z

Meco Transmission

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	~~= Meco Transmission =~~

	Transmission components handle power transfer between machinery components. They model rotating shafts and gears that connect pumps, turbines, and other rotating equipment in rocket engine systems.		Transmission components handle power transfer between machinery components. They model rotating shafts and gears that connect pumps, turbines, and other rotating equipment in rocket engine systems.

Admin: Created page with "= Meco Transmission = Transmission components handle power transfer between machinery components. They model rotating shafts and gears that connect pumps, turbines, and other rotating equipment in rocket engine systems. == Overview == The Meco Rocket Simulator supports 2 transmission component types: {| class="wikitable" |- ! Component Type !! Purpose !! Key Parameters !! Connections |- | Shaft || Primary rotating element || Rotor inertia properties || Machinery, Gea..."

2025-07-07T21:20:07Z

Created page with "= Meco Transmission = Transmission components handle power transfer between machinery components. They model rotating shafts and gears that connect pumps, turbines, and other rotating equipment in rocket engine systems. == Overview == The Meco Rocket Simulator supports 2 transmission component types: {| class="wikitable" |- ! Component Type !! Purpose !! Key Parameters !! Connections |- | Shaft || Primary rotating element || Rotor inertia properties || Machinery, Gea..."

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= Meco Transmission =

Transmission components handle power transfer between machinery components. They model rotating shafts and gears that connect pumps, turbines, and other rotating equipment in rocket engine systems.

== Overview ==

The Meco Rocket Simulator supports 2 transmission component types:

{| class="wikitable"
|-
! Component Type !! Purpose !! Key Parameters !! Connections
|-
| Shaft || Primary rotating element || Rotor inertia properties || Machinery, Gears
|-
| Gear || Speed/torque conversion || Teeth count, gear ratios || Other Gears
|}

== Shaft ==

=== Overview ===
* '''Type:''' <code>Shaft</code>
* '''Purpose:''' Primary rotating shaft that connects machinery and provides rotational inertia
* '''Modeling:''' Rotational dynamics with inertial properties

=== Parameters ===
* '''Basic Parameters:'''
** <code>name</code> - Component name (string)
** <code>rotorLength</code> - Shaft length in meters (double)
** <code>rotorRadius</code> - Shaft radius in meters (double)
** <code>rotorDensity</code> - Material density in kg/m³ (double)

* '''Connection Parameters:'''
** <code>gears</code> - Array of connected gear names (array of strings)

=== Design Guidelines ===

==== Material Properties ====
* '''Steel Shafts:''' 7850 kg/m³ density, high strength
* '''Titanium Shafts:''' 4500 kg/m³ density, lighter weight
* '''Aluminum Shafts:''' 2700 kg/m³ density, lowest weight but limited strength

==== Sizing Considerations ====
* '''Length:''' Physical distance between connected components
* '''Radius:''' Sized for torque transmission and critical speed avoidance
* '''Inertia:''' Affects transient response and system stability

==== Critical Speed ====
Avoid operating near shaft critical speeds:
* '''First Critical:''' Typically avoid 70% of critical speed
* '''Flexible Shaft:''' Consider multiple critical speeds for long shafts
* '''Rigid Shaft:''' Operate well below first critical speed

=== Example JSON ===
<pre>
{
"name": "LOX Transmission",
"category": 4,
"type": "Shaft",
"rotorLength": 0.5,
"rotorRadius": 0.03,
"rotorDensity": 7850,
"gears": ["Reduction Gear", "Output Gear"]
}
</pre>

== Gear ==

=== Overview ===
* '''Type:''' <code>Gear</code>
* '''Purpose:''' Speed and torque conversion between rotating components
* '''Modeling:''' Gear ratios, inertial properties, and mechanical connections

=== Parameters ===
* '''Basic Parameters:'''
** <code>name</code> - Component name (string)
** <code>teeth</code> - Number of teeth (integer)
** <code>rotorLength</code> - Gear face width in meters (double)
** <code>module</code> - Gear module in meters (double)
** <code>rotorDensity</code> - Material density in kg/m³ (double)

* '''Connection Parameters:'''
** <code>gears</code> - Array of connected gear names (array of strings)

=== Design Guidelines ===

==== Gear Ratios ====
Gear ratio between two gears = Teeth₂ / Teeth₁
* '''Speed Increase:''' Ratio > 1 (more teeth on driven gear)
* '''Speed Reduction:''' Ratio < 1 (fewer teeth on driven gear)
* '''Typical Ratios:''' 2:1 to 10:1 for single stage

==== Module Selection ====
Module defines gear tooth size:
* '''Fine Pitch:''' 0.001-0.003 m module for high-speed applications
* '''Medium Pitch:''' 0.003-0.008 m module for general applications
* '''Coarse Pitch:''' 0.008-0.020 m module for high-torque applications

==== Gear Sizing ====
* '''Pitch Diameter:''' teeth × module
* '''Face Width:''' Affects load capacity and gear life
* '''Material:''' Steel for strength, consider weight for aerospace applications

=== Example JSON ===
<pre>
{
"name": "Reduction Gear",
"category": 4,
"type": "Gear",
"teeth": 48,
"rotorLength": 0.025,
"module": 0.004,
"rotorDensity": 7850,
"gears": ["Output Gear"]
}
</pre>

== Transmission System Design ==

=== Single Shaft Systems ===
Direct connection between pump and turbine:
* '''Advantages:''' Simple, reliable, minimal losses
* '''Disadvantages:''' Fixed speed ratio, limited optimization
* '''Applications:''' Gas generator cycles, simple configurations

=== Geared Systems ===
Multiple shafts connected through gears:
* '''Advantages:''' Speed optimization, multiple power take-offs
* '''Disadvantages:''' Complexity, additional losses, weight
* '''Applications:''' Staged combustion cycles, auxiliary drives

=== Speed Optimization ===
# '''Pump Speed:''' Optimize for flow and head requirements
# '''Turbine Speed:''' Optimize for gas flow and efficiency
# '''Gear Ratio:''' Match pump and turbine optimal speeds

=== Inertial Effects ===
# '''System Inertia:''' Sum of all rotating component inertias
# '''Transient Response:''' Higher inertia slows acceleration/deceleration
# '''Stability:''' Affects control system design and governor response

== Connection Hierarchy ==

=== Shaft Connections ===
Shafts connect to:
# '''[[Meco Machinery|Machinery]]''' components (pumps, turbines)
# '''Gears''' for speed/torque conversion
# Other transmission components

=== Gear Connections ===
Gears connect to:
# '''Other Gears''' for multi-stage reduction/multiplication
# Must ultimately connect to a '''Shaft''' for machinery attachment

=== Connection Rules ===
# All machinery must connect to a shaft
# Gears can connect to other gears or shafts
# Connection topology must form valid mechanical system
# Avoid circular dependencies in gear trains

== Performance Considerations ==

=== Efficiency ===
* '''Shaft Bearings:''' 99-99.5% efficiency per bearing set
* '''Gear Meshes:''' 96-99% efficiency per mesh
* '''System Efficiency:''' Product of all component efficiencies

=== Losses ===
* '''Bearing Friction:''' Function of speed and load
* '''Gear Mesh Losses:''' Sliding friction and churning
* '''Windage:''' Air resistance at high speeds
* '''Oil Churning:''' Viscous losses in lubrication system

=== Reliability ===
* '''Fatigue Life:''' Consider stress cycles and material limits
* '''Lubrication:''' Essential for bearing and gear life
* '''Contamination:''' Protect from propellant and combustion products
* '''Thermal Effects:''' Account for temperature variations

== Common Configurations ==

=== Direct Drive ===
<pre>
Turbine → Shaft → Pump
</pre>
* Simple, reliable configuration
* Fixed speed ratio
* Used in gas generator cycles

=== Single Reduction ===
<pre>
Turbine → Shaft → Gear → Gear → Shaft → Pump
</pre>
* Allows speed optimization
* Single gear reduction stage
* Common in rocket applications

=== Multiple Shaft ===
<pre>
Turbine₁ → Shaft₁ → Gear₁ ↘
→ Main Gear → Main Shaft → Main Pump
Turbine₂ → Shaft₂ → Gear₂ ↗
</pre>
* Multiple power sources
* Complex but flexible
* Used in staged combustion cycles

== Design Process ==

# '''Power Requirements:''' Determine pump power needs
# '''Speed Requirements:''' Optimize pump and turbine speeds
# '''Gear Ratios:''' Calculate required speed ratios
# '''Shaft Sizing:''' Size for torque and critical speeds
# '''Gear Sizing:''' Size for torque capacity and life
# '''Integration:''' Verify mechanical packaging and connections

== See Also ==

* [[Meco Rocket Simulator Components Overview|Main Components Overview]]
* [[Meco Machinery|Machinery Components]]
* [[Meco Control Parameters|Control Parameters]]
* Mechanical Design Reference
* Gear Design Guidelines
* Shaft Critical Speed Analysis

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

Meco Transmission - Revision history

Admin: /* Meco Transmission */