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

By Jean-Charles Mar?

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

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

Currently, takeovers by means of significant companies of smaller businesses during this box is threatening the services of aerospace hydraulics and has necessarily resulted in a lack of services. additional elimination of hydraulics educating in engineering levels capacity there's a have to capitalize efforts during this box as a way to circulation it ahead as a way of offering more secure, greener, more cost-effective and quicker aerospace services.

 

The issues coated during this set of books represent an important resource of data for people and engineers looking to research extra approximately aerospace hydraulics.

 

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

Sample text

For power systems, given that only one channel is active at once, there is no desynchronization issue. The channel in service must be able to deliver full performance all by itself. The normal channel ages quickly, as opposed to the standby channel. If the standby channel is sized appropriately, there is no performance loss between the normal mode and the standby mode. The entire power needed to perform the function is collected from only one power network. It is necessary to take precautions against possible hidden faults in the standby channel, which is not used in normal mode (dormant fault).

In order to take full advantage of redundancy, systems are given specific properties: independence, diversity and segregation. – Independence ensures that the failure of one channel does not spread to other channels. – Diversity prevents the same internal fault from appearing in all channels. 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.

10. Jacottet-Leduc and Samm hydraulic assistance cylinders (Alouette III) The universalization of the use of hydraulics for actuation functions led to a gradual increase of the hydraulic power installed on board: under regular activity mode, a few kilowatts on board the DC3 (1936, 11 tons), 23 kW for the Caravelle (43 tons, 1958), 125 kW on Airbus A320 (1988, 78 tons), 240 kW on Airbus A340 (275 tons, 1993) and 368 kW for Airbus A380 (575 tons, 2007). This increase in size effect is also well illustrated concerning power requirements for rudder actuation.

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