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

By Jean-Charles Mar?

This publication is the 1st of a sequence 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 specializes in hydraulically provided actuators. Emphasis is wear hydraulic strength actuators as a expertise that's used generally for all airplane, together with more moderen plane.

Currently, takeovers by way of significant enterprises of smaller businesses during this box is threatening the services of aerospace hydraulics and has unavoidably 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 to be able to stream it ahead as a way of supplying more secure, greener, more cost-effective and swifter aerospace services.

 

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

 

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

Sample text

As a result of these differences, each actuator with a position servo-loop is actively trying to impose a specific position to the load. Each actuator is therefore fighting against the other actuator, which is also trying to impose its position. In the end, the position reached is satisfactory but the actuators, the structure and, depending on the circumstances, the power networks are unnecessarily solicited: this fight for control is commonly called force-fighting. 5. Static redundancy Advantages Disadvantages No loss of function, even during the transient phase following the occurrence of a failure.

This is particularly true when defining the maximum tolerated failure rate for a catastrophic event, in order to make this event extremely unlikely. Concerning commercial aeronautics, this threshold is tied to in-service experience feedback. Typically, it is considered that, at most, one catastrophic event occurs every million flight hours2 and that only 10% of disastrous accidents were caused by the airplane itself. Furthermore, on a commercial aircraft, it is estimated that 100 different and independent technical failure causes have catastrophic consequences, each having approximately the same probability of occurrence.

2. Fail-safe system If loss of function is tolerated, the system must stop functioning without disturbing other systems or their environment. Such a system is said to be fail-safe. Depending on the situation, the system must then: – remain frozen in the configuration it was in when the failure occurred, in which case it is called a fail-freeze system; – let itself be dragged along by other systems, optionally while dissipating energy to contribute to stability if it is a power system, in which case it is called a fail-passive system; and – return to a predetermined neutral configuration, in which case it is called a fail-neutral system.

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