This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Modelling and Simulation of Complex Fluid and Mechanical Aircraft Systems
Annotation ability available
Sector:
Language:
English
Abstract
Modelling and simulation is of crucial importance for the understanding of system dynamics. In aircraft, simulation has been strong in the area of flight control. Modelling and simulation of the hydraulic systems has also a long tradition. The rapid increase in computational power has now come to a point where complete modelling and simulation of all the sub systems in an aircraft is not far away. This means new challenges in dealing with very complex multi domain systems. Of all the systems in an aircraft fluid power systems is one of the most difficult to handle from a numerical point of view. They are characterised by difficulties such as discontinuities, very strong non-linearities, stiff differential equations and a high degree of complexity.
A considerable effort has therefore been made to develop methods suitable for simulation of such systems. This means that it is possible to simulate fluid power systems much more efficiently than before, and that a lot of systems can even be simulated in real time. The distributed modelling technique used, also makes it possible to partition the system for parallel processing. This means that it is possible to simulate much larger systems within reasonable time. It also is a valid paradigm for multi domain system.
The rapid development in simulation methods and the general increase in hardware performance imply that simulations can be run thousands of times faster than just a few years ago. As a consequence, there is no longer such need to use very economic, more or less analytical methods. This means that design methods based on different kinds of numerical optimisation for system design, are becoming much more important.
Authors
Citation
Krus, P., "Modelling and Simulation of Complex Fluid and Mechanical Aircraft Systems," SAE Technical Paper 985560, 1998, https://doi.org/10.4271/985560.Also In
References
- Box M. J. A new method of constrained optimization and a comparison with other methods Computer Journal 8 42 52 1965
- Burton, J.D. Edge, K.A. Burrows, C.R. “Modelling Requirements for the Parallel Simulation of Hydraulic Systems” ASME Journal of Dynamic Systems and Control March 1994
- Krus P ‘An Automated Approach for Creating Components and Subsystems for Simulation of Distributed Systems’ ‘Nineth Bath International Fluid Power Workshop’ Bath UK 1996
- Krus P Palmberg J-O Löhr F Backlund G ‘ The Impact of Computational Performance on Optimisation in Aircraft Design ’ I MECH E ‘AEROTECH 95’ Birmingham, UK
- Krus P Weddfelt K Palmberg J-O ‘Fast Pipeline Models for Simulation of Hydraulic Systems’ ASME anual winter meet Atlanta 1991 ASME Journal of Dynamic Systems, Measurement and Control March 1994
- Krus P Jansson A Palmberg J-O ‘Optimization Using Simulation for Aircraft Hydraulic System Design’ Procedings of IMECH International Conference on Aircraft Hydraulics and Systems London, UK 1993
- Krus P Jansson A Palmberg J-O Weddfelt K ‘Distributed Simulation of Hydromechanical Systems’ ‘Third Bath International Fluid Power Workshop’ Bath, UK 1990