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Standard

Aerospace - Test Methodology for Electrohydrostatic Actuators

2019-12-31
WIP
ARP5879A
This document provides an overview of the tests and issues related to testing that are unique to Electrohydrostatic Actuators (EHAs). An EHA incorporates a linear or rotary hydraulic actuator and a variable speed, reversible electric servomotor driving a fixed displacement hydraulic pump for actuator control, and associated power drive electronics. The tests and issues documented are not necessarily all-inclusive. This document discusses both, the tests applicable to EHAs and the test methodologies to accomplish the test objectives. This document also lists tests that are not unique to EHAs, but are still applicable to EHAs. In these instances a discussion of such tests is not contained in this document, and as applicable, the reader may reference ARP1281 (Actuators: Aircraft Flight Controls, Power Operated, Hydraulic, General Specification For), which addresses test issues applicable to electrohydraulic flight control servoactuators.
Standard

Duty Cycle Considerations for Electrohydrostatic Actuators

2018-05-07
CURRENT
ARP6025
This recommended practice provides a method of characterizing Electrohydrostatic Actuator (EHA)/Electrohydrostatic Module (EHM) duty cycles for the following purposes: a To enable the comparison of the severity of different EHA/EHM applications. This allows the use of previously qualified designs without the need for repeat testing. b To define parameters for endurance-test design of EHAs; e.g., a way of executing a life-equivalent test in a shorter duration by increasing the speed of cycles and/or the level of applied loads.
Standard

Sizing Considerations for Electrohydrostatic Actuation Pumps and Motors

2015-10-29
WIP
ARP6352
Recommendations for EHA Pump and Motor sizing based on considerations for various actuator performance requirements, including no-load speed, breakout torque, low temperature, stiffness, dynamic response, maximum pressure-velocity capability, and other conditions.
Standard

Aerospace – Test Methodology for Electrohydrostatic Actuators

2010-04-28
CURRENT
ARP5879
This document provides an overview of the tests and issues related to testing that are unique to Electrohydrostatic Actuators (EHAs). An EHA incorporates a linear or rotary hydraulic actuator and a variable speed, reversible electric servomotor driving a fixed displacement hydraulic pump for actuator control, and associated power drive electronics. The tests and issues documented are not necessarily all-inclusive. This document discusses both, the tests applicable to EHAs and the test methodologies to accomplish the test objectives. This document also lists tests that are not unique to EHAs, but are still applicable to EHAs. In these instances a discussion of such tests is not contained in this document, and as applicable, the reader may reference ARP1281 (Actuators: Aircraft Flight Controls, Power Operated, Hydraulic, General Specification For), which addresses test issues applicable to electrohydraulic flight control servoactuators.
Standard

Reservoirs, Hydraulic, Maintenance Free, Electrohydrostatic Actuator (EHA)

2007-10-06
WIP
ARP5772
Reservoirs complying with this recommended practice are designed for use in commercial and military aircraft and other aerospace applications. These devices store hydraulic fluid under pressure and are normally installed on the low pressure side of the hydraulic pump. The reservoirs provide for fluid volume changes due to temperature variation, unbalanced actuator operation and leakage. These devices are rated for EHA hydraulic system operating pressures up to 5,000 PSIG (34,474 KPa) and temperatures between -65°F and 275°F (-54°C and 135°C).
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