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

By Jean-Charles Mar?

This e-book 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 details on actuators and their reliability, and specializes in hydraulically provided actuators. Emphasis is wear hydraulic energy actuators as a know-how that's used greatly for all plane, together with more recent 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. extra removing of hydraulics educating in engineering levels ability there's a have to capitalize efforts during this box which will circulate it ahead as a method of supplying more secure, greener, more cost-effective and speedier aerospace services.


The subject matters 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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Transient loss of function. 4. Examples of response to failure In terms of actuation, redundancy of the actuation function is implemented by summing either forces or displacements outputted by each channel. The summation of displacements is hardly ever used. 2 illustrates the concept of force summation applied to actuators with multiple hydraulic power channels. There are two two-channel solutions. First, the tandem solution associates two pistons on the same rod. This is equivalent to having two rods mounted in series (geometrically).

3. 6) consists of feeding back the output to each of the inputs, in order to reduce the bias caused by the failing element in averaging power transmission systems. This bias can even be entirely cancelled by taking advantage of the presence of an integrating effect downstream the summation of channel outputs (for instance the position of a cylinder rod is, broadly speaking, the integral of the flow rate supplied to cylinder chambers). When it is used, this solution is often combined with a detection–correction concept.

Furthermore, if the stream is vertical, the fluid rises up to 2,000 m high, given that the conversion of hydrostatic energy into hydro-kinetic energy is also perfect. 5°C for a fluid with a heat capacity of 1,900 J/kg/°C. – Since a liquid can never be rigorously incompressible, it is interesting to quantify the energy associated with its elastic deformation. 8] For instance, for an increase in pressure by 100 bar, the hydraulic liquid of a commercial aircraft (ρ= 1,000 kg/m3 and B = 10,000 bar, in practice) stores a specific deformation energy of 50 J/kg and the relative variation of fluid volume is 1%.

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