Electric Backup Hydraulic Actuation (EBHA) CSDEBHA01

Electric backup hydraulic actuation systems operate as a conventional electrohydraulic servoactuator when normal aircraft hydraulic system is available and as an electrohydrostatic actuator upon loss of the aircraft hydraulic system.

Parker Aerospace designs and manufactures electric backup hydraulic actuation (EBHA) systems. An EBHA is a conventional electrohydraulic servoactuator with a backup EHA in one integrated package. This result in an actuator that is smaller and lighter than dual tandem or two independent simplex actuators. EHBAs allow higher surface availability, or probability loss of function (PLOF), than with a single actuator. A single EBHA can replace dual tandem or multiple simplex actuators primarily used to address loss of the hydraulic system. EBHAs incorporate an independent power source to mitigate potential common mode failures.

EBHAs contain all of the components and function of a conventional electrohydraulic servoactuator. In addition, to provide back-up mode upon loss of the hydraulic system, EBHAs contain of a fixed displacement, high speed, reversible pump driven by a brushless DC electric motor. In electric back-up (EB) mode, the actuator position is controlled by the pump rotation direction and actuator piston velocity is controlled by pump rotational speed.

The actuator output force is a function of the electric motor output torque. In EB mode the actuator performance is equivalent to the electrohydraulic servoactuator performance mode. Our EBHA designs are simplex-hydraulic output and contain fail-safe features, overload protection, and optimized packaging to reduce weight. Parker EBHAs are known throughout the industry for providing reliable performance within customer specifications.

EBHAs can provide an overall aircraft weight advantage through elimination of the third aircraft hydraulic system with an electric system.

Parkers EHA/EBHA technology represents three decades of research, development, and flight-tested reliability. Parker EBHAs are fully qualified and in production on the Gulfstream G650 business jet.

Parker is self-sufficient in all technologies involved in EBHAs:
• Systems and actuation
• EHA pumps and motors
• Power and control electronics

APPLICATIONS:
EBHAs can be used anywhere traditional hydraulic actuation is needed. Today EBHAs are used on:
•Business jets
•Commercial transport aircraft
•Military transport aircraft

FEATURES AND ATTRIBUTES:
Our EBHAs offer significant advantages such as:
• Fault tolerant and fail-safe designs
• Integrated brushless DC motor/pump design for optimum performance and efficiency
• Reservoir:
o Provides positive pump inlet pressure under all temperature conditions in EB mode
o Fluid volume sufficient for operation in EB mode for specified mission duration
o Prevents cavitation and flutter suppression protection during fail-safe mode
• Cylinder pressure transducers
• Overload protection
• Latest technology materials provide high reliability at minimum weight
• Unique benefits:
o Custom fit to customer envelope
o Optimized size and weight
o Pedigree of flight proven subcomponents
• Elimination of the third aircraft hydraulic system with an electric system
• Independent power source to mitigate potential common mode failures
• Reduced aircraft vulnerability – single failures will not disable multiple actuators
• Reduced aircraft system weight

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