Inert mass refers to all solid, liquid and gaseous substances on board a space system that are not consumed during flight or that do not generate propulsive impulse even if they are consumed. These substances are not directly involved in the generation of thrust or propulsion, but still play an important role in the operation and functionality of the spacecraft. Here are some important aspects and examples of inert masses:
Definition and meaning
The inert mass comprises all materials and substances on board a spacecraft that are not used to generate propulsion momentum. These can remain unchanged during the flight or be consumed without contributing directly to propulsion.
Inert masses can be found in various systems and components of a spacecraft. They are crucial for the operation, safety and functionality of the spacecraft, even if they do not contribute directly to propulsion.
Examples of inert masses
Inert liquids
- Hydraulic fluids: These are used in hydraulic systems to move and control mechanical components.
- Residual and non-flammable propellant: These are propellants that are not combusted and therefore do not generate a drive impulse.
- Pressurized tank gases: These gases are used to maintain the pressure in fuel tanks without serving as fuel themselves.
Inert solids
- Ice: Can form in various parts of the spacecraft and must be taken into account even if it does not contribute directly to propulsion.
- Ablative heat shielding: Materials used to protect the spacecraft from heat and slowly degrade during re-entry.
- Solid rocket motor insulation: Insulating materials used in solid rocket motors to ensure structural integrity.
- Nozzle linings: Materials used in the nozzles of rocket motors to protect them from extreme temperatures and mechanical wear.
Properties of the inert mass
Functional role
Inert masses play an important functional role in a spacecraft, even if they do not contribute directly to propulsion. They are crucial for the operation of systems, the structural integrity and the safety of the spacecraft.
Mass management
The consideration of inert mass is an important aspect of mass management in space travel. It influences the overall mass of the spacecraft and must be taken into account during planning and design.
Safety and reliability
Inert masses contribute to the safety and reliability of a spacecraft. They are crucial for protecting against extreme conditions, maintaining the operation of systems and ensuring structural integrity.
Conclusion
Inert mass is a crucial aspect in the planning and operation of spacecraft. It comprises a variety of materials and substances that do not contribute directly to propulsion, but nevertheless play an important role in the operation, safety and functionality of the spacecraft. By taking inert mass into account, spacecraft can be designed and operated more efficiently and safely.
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