Abstract
A simulation model for an oleo-pneumatic shock absorber of a combat aircraft is presented. System equations are presented incorporating the effects of friction, gas spring and damping. The model is validated with experimental data. The objective is to use the model as a tool to improve the shock absorber condition monitoring and fault detection methods. As a part of that a new measuring instrument is discussed.
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- ρ:
-
Density
- μ:
-
Dynamic viscosity
- δQ:
-
Heath exchange with surroundings
- A:
-
Orifice cross-sectional area
- Amp :
-
Metering pin cross-sectional area
- AL :
-
Lower chamber cross-sectional area
- APH :
-
Primary piston head cross-sectional area
- b:
-
Covolume
- cq :
-
Flow coefficient
- dc :
-
Clearance between envelope and piston
- dp :
-
External piston diameter
- dp:
-
Piston diameter
- dr:
-
Piston rod diameter
- fin :
-
Force at input port
- Fµ1 :
-
Primary piston assembly friction
- Fµ2 :
-
Viscous friction due to leakage
- Fµ3 :
-
High pressure chamber friction
- FC :
-
Coulomb friction force
- FE :
-
External force
- FS :
-
Static friction force
- g:
-
Gravitational acceleration
- h:
-
Enthalpy
- lc :
-
Contact length
- m:
-
Mass of gas
- msa :
-
Shock absorber mass
- p:
-
Pressure
- P:
-
Pressure
- PHP :
-
High pressure chamber pressure
- PU :
-
Upper chamber pressure
- PL :
-
Lower chamber pressure
- Pph :
-
Pressure acting on primary piston head
- r:
-
Specific gas constant
- T:
-
Temperature
- v:
-
Relative speed
- v:
-
Specific volume
- v− :
-
Piston velocity
- v+ :
-
Envelope velocity
- V:
-
Volume
- Xref :
-
Inertial reference position
References
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© 2016 Springer International Publishing Switzerland
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Heininen, A., Aaltonen, J., Koskinen, K.T., Huitula, J. (2016). Simulation as a Tool in Evaluating Combat Aircraft Shock Absorber Condition. In: Koskinen, K., et al. Proceedings of the 10th World Congress on Engineering Asset Management (WCEAM 2015). Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-27064-7_24
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DOI: https://doi.org/10.1007/978-3-319-27064-7_24
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Publisher Name: Springer, Cham
Print ISBN: 978-3-319-27062-3
Online ISBN: 978-3-319-27064-7
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