Read e-book online Aerospace Actuators 1: Needs, Reliability and Hydraulic PDF

By Jean-Charles Mar?

ISBN-10: 1848219415

ISBN-13: 9781848219410

This e-book is the 1st of a sequence of volumes that disguise the subject of aerospace actuators following a systems-based process.

This first quantity offers basic info 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 plane, together with more recent plane.

Currently, takeovers by means of significant enterprises of smaller businesses during this box is threatening the services of aerospace hydraulics and has necessarily resulted in a lack of services. extra elimination of hydraulics educating in engineering levels potential there's a have to capitalize efforts during this box so one can circulate it ahead as a way of offering more secure, greener, more affordable and speedier aerospace services.

 

The subject matters coated during this set of books represent an important resource of knowledge for people and engineers trying to study extra approximately aerospace hydraulics.

 

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

Sample text

Their weight significantly impacts the global power density of hydraulic systems, more strongly so in large aircrafts that may comprise several kilometers of hydraulic lines. Two examples help illustrate this drawback. The first concerns Airbus A380. For this type of very large aircraft, it appears that the weight of hydraulic equipment typically constitutes 25% of the total weight of the hydraulic system. Pipes, clamping and hydraulic fluid account for the remaining weight. The second example deals with Boeing B777.

Hydromechanical actuators (HMA) Hydromechanical actuators (HMA) have been the “go-to” actuators for aircraft up until the emergence of electrical controls, such as those chosen for Airbus A300-600 spoilers. With very few recent exceptions, flight controls of helicopters still use this type of actuator. – Hydraulic servo actuators (HSA) The emergence of computerized electrical controls was made possible by the development of hydraulic servo actuators (HSA). Indeed, within these actuators, a servovalve serves as a power interface between electrical and hydraulic domains.

This advantage is soon dissipated for powers lower than a few kilowatts. – Easy generation of large forces at low speed Hydraulic cylinders make it possible to generate large forces at low speed in an extremely simple manner. This process involves no other mechanical reducer than a lever arm effect provided directly by the driven load: this is commonly called a direct drive design. – High dynamic response characteristics and high acceleration abilities In the absence of a high reduction gear ratio, inertia (mass or moment of inertia) of the moving parts of the actuator reflected at the load is in general very weak with regard to inertia of the load to be moved.

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


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