By Jean-Charles Mar?
This ebook is the 1st of a chain of volumes that conceal the subject of aerospace actuators following a systems-based technique.
This first quantity offers common details on actuators and their reliability, and makes a speciality of hydraulically provided actuators. Emphasis is wear hydraulic energy actuators as a know-how that's used commonly for all airplane, together with more moderen airplane.
Currently, takeovers by way of significant organizations of smaller businesses during this box is threatening the services of aerospace hydraulics and has unavoidably resulted in a lack of services. extra removing of hydraulics instructing in engineering levels capability there's a have to capitalize efforts during this box so as to flow it ahead as a method of delivering more secure, greener, more affordable and speedier aerospace services.
The issues 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
For example, standards D0254/ED 80 for equipment and DO-178B/ED-12C for software introduce five qualitative Design Assurance Levels (DAL) applied to functions Reliability 35 (F-DAL for Functional DAL) or to their physical constituents (I-DAL for Item DAL). For energy systems, it is much easier to prove, by means of a calculation, that architectures and sizing make it possible to satisfy reliability requirements. In this situation, the acceptability threshold must then be defined numerically for each degree of gravity, at the maximum permissible occurrence probability.
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.
In principle, monitoring signals are absent. g. position). Wear of the elements is identical. Power usage is shared between the networks associated 4 with each element . Precautionary synchronization measure to avoid or limit force-fighting between different channels. This impacts sizing, controls and maintenance. No non-redundant elements. 5. The main advantages and disadvantages of static redundancy 4 This remark is poorly suited for hydraulic actuators when power metering is achieved by variable hydraulic restrictions and when power is supplied at constant pressure: by the conceptual principle, restrictions must waste all supply pressure in excess with respect to load demand.