![]() Incidentally, you may have noticed that older designs, particularly the high wing monoplanes and biplanes, also utilize cables for operating the elevators and ailerons. This is because cables provide the simplest, lightest, and most reliable rudder control system you can install. Rudders are almost exclusively cable operated. Look over a number of aircraft and here’s what you will find: Most homebuilt designs quite effectively incorporate both cables and push-pull tubes for activating the different control functions. On the other hand, if you are building an airplane of your own design, you will have to decide which flight control system option will best suit your design and its needs. If you are building from plans, or from a kit, the best aircraft flight control system is the one the designer designed for the airplane. When we say "best," what do we really mean? The lightest? The least expensive? Easiest to build and install? The strongest? The most friction free? The most reliable? Which of the two methods of operating the controls do you think is the best? In homebuilts, control surfaces are usually operated by cables, or by a combination of cables and push-pull tubes. The best way to assure a high degree of control system reliability, before that all important test flight, is by implementing traditional control system standards for its installation, operation, inspection and maintenance. unfortunately, that will probably remain an unproven quality until after the aircraft has been flight tested. He must also figure out how to make and install the individual components and how to make them all work correctly.įurthermore, he must assure himself that his control system is a reliable one. The aerodynamic parameters are also used in the multi-objective flight control for drag minimization and maneuver/ gust load alleviation control.All pilots know how aircraft control systems work, and how to operate them.īut for the homebuilder pilot, that knowledge only scratches the surface. This feature utilizes system identification methods to estimate aerodynamic parameters for the on-line optimization. In addition, a real- time drag minimization control strategy is included in the guidance loop. Thus, the multi-objective flight control technology can effectively manage the complex interactions of the individual single-objective flight control system design and take into account multiple competing requirements to achieve optimal flight control solutions that have the best compromise for these requirements. Each of these objectives can be a major control system design in its own right. The multi-objective flight control technology comprises the following objectives all acting in a synergistic manner: 1) traditional stability augmentation and pilot command-following flight control, 2) drag minimization, 3) aeroelastic mode suppression, 4) gust load alleviation, and 5) maneuver load alleviation. This technology leverages the availability of distributed flight control surfaces in modern transports. NASA Ames Research Center has developed a novel technology that employs a new multi-objective flight control optimization framework to achieve multiple control objectives simultaneously. Structural flexibility could also cause adverse interactions with flight control and structural vibration which can compromise aircraft stability, pilot handling qualities, and passenger ride quality. This effect could offset any weight saving benefits realized by the composite wings. Under off-design flight conditions, changes in the wing shape due to structural flexibility cause the wing aerodynamics to be non-optimal. On modern airplanes, composite wings offer a greater degree of aerodynamic efficiency due to weight savings, but at the same time introduce more structural flexibility than their aluminum counterparts. ![]() Composite materials are being used in aerospace design because of their high strength-to-weight ratio. ![]()
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