Aerospace Actuators 1: Needs, Reliability and Hydraulic by Jean-Charles Mar?

By Jean-Charles Mar?

This publication is the 1st of a chain of volumes that disguise the subject of aerospace actuators following a systems-based process.

This first quantity offers normal info on actuators and their reliability, and makes a speciality of hydraulically provided actuators. Emphasis is wear hydraulic strength actuators as a know-how that's used generally for all plane, together with more moderen airplane.

Currently, takeovers by way of significant firms of smaller businesses during this box is threatening the services of aerospace hydraulics and has necessarily ended in a lack of services. additional removing of hydraulics instructing in engineering levels skill there's a have to capitalize efforts during this box with the intention to stream it ahead as a way of offering more secure, greener, more cost-effective and speedier aerospace services.


The themes lined during this set of books represent an important resource of data for people and engineers trying to examine extra approximately aerospace hydraulics.


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Extra resources for Aerospace Actuators 1: Needs, Reliability and Hydraulic Power Solutions

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Regarding the double-deck Airbus A380, it represents 5 tons out of 550 tons and it is estimated6 that the transition from a working pressure of 207 bar to one of 350 bar made it possible to save between 500 and 1,000 kg out of the overall mass of the hydraulic system. 4. Potential advantages and disadvantages of hydraulic technology The benefits of transmitting power in hydrostatic form are numerous. – High power density of equipment For a given piece of equipment (pump or actuator including their power dosing element), the power density can reach 10 kW/kg, in the best case 5 Military airplanes use a hydrocarbon-based fluid whereas commercial airplanes use a synthetic fluid which is more resistant to fire but has restricting properties.

This solution relies on giving different design features to every channel, especially computer systems. Therefore, the aim is to pick different devices (such as computers), different programming languages, different 44 Aerospace Actuators 1 wiring and even different engineering teams from different geographical locations. Regarding power transmission systems, diversity is implemented by involving different physical principles. For instance, in order to drive a hydraulic pump, it is possible to use the power of either the main engine, an electric motor, a wind turbine or even an air turbine.

This performance requirement can also apply in the event of a double failure, in which case the system is said to be double fail-operative or double fail-functional. If it is possible to sustain a loss of function for a short while, the failure triggers a system reconfiguration. Following this, the system can once again perform its function with full performance or at least with reduced performance. 2. Fail-safe system If loss of function is tolerated, the system must stop functioning without disturbing other systems or their environment.

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