Aircraft Hydraulic Pressure Boosting With Return-Line Rerouting
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Solution Overview
Problem
Aircraft hydraulic systems face challenges in efficiently supplying pressurized hydraulic fluid to flight control actuators, particularly during high load demands, leading to inefficiencies and energy losses due to pressure drops in return lines.
Innovation Solution
The hydraulic system incorporates an engine-driven pump delivering fluid at a first pressure, a boost pump delivering fluid at a higher second pressure, and an accumulator to supplement fluid supply, with a valve system that reroutes fluid from the return line to the boost pump to enhance responsiveness and reduce energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If hydraulic fluid is delivered from the engine driven pump at a first pressure through supply lines to the actuators, then the actuators can move the flight control members, but pressure drops occur in the return lines causing energy loss
Solution Approach 1:
The hydraulic system is segmented into two independent loops: a first loop with an engine-driven pump delivering at a first pressure, and a second loop with a boost pump delivering at a second (higher) pressure. This segmentation allows each pump to operate independently at its optimal pressure level, eliminating the energy loss from pressure drops in return lines while maintaining the capability to deliver high pressure to actuators when needed.
Solution Approach 2:
A valve system acts as an intermediary between the two pump loops, selectively connecting either the first loop or the second loop to the actuators based on pressure demands. This intermediary mechanism allows the system to switch between low-pressure operation (reducing energy loss) and high-pressure operation (maintaining power capability) without the energy penalties of a single-loop system.
2Reliability
If a single pump delivers hydraulic fluid at high pressure to meet peak load demands, then sufficient pressure is available for high load conditions, but the supply lines and pump must be sized for peak demand leading to increased weight
Solution Approach 1:
The system divides the hydraulic power supply into two segments: a primary engine-driven pump for normal operation and a secondary boost pump for peak load conditions. This segmentation allows each pump and its associated supply lines to be sized for their specific operational range, reducing the overall system weight compared to a single pump sized for peak demand.
Solution Approach 2:
The valve system dynamically switches between the two pump loops based on real-time pressure demands. During normal operation, the lighter-engine-driven pump supplies the actuators; during peak load conditions, the valve redirects flow to the boost pump. This dynamic switching allows the system to maintain reliability for high-pressure demands while minimizing weight through optimized component sizing.
3Productivity
If the hydraulic system uses a single loop with one pump, then the system structure is simpler, but the system cannot efficiently meet varying pressure demands without energy loss
Solution Approach 1:
The hydraulic system is divided into two independent loops, each with its own pump and valve control. The first loop uses an engine-driven pump for baseline pressure delivery, while the second loop uses a boost pump for high-pressure demands. This segmentation improves productivity by eliminating energy losses from pressure drops, while the added complexity is managed through systematic valve control and independent loop operation.
Solution Approach 2:
The system changes the pressure parameter by switching between two different pump sources with different operating pressures. The valve system monitors pressure demands and switches between the engine-driven pump (lower pressure) and the boost pump (higher pressure), optimizing energy efficiency across varying operational conditions while maintaining a manageable system structure through parameter-based control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures timely and efficient delivery of elevated pressure fluid to actuators, reducing energy consumption and weight by minimizing the size of supply lines and preventing energy loss from pressure drops in return lines.
Implementation Method 1
An engine driven pump delivers hydraulic fluid to the actuator at a first pressure
Implementation Method 2
a boost pump delivers hydraulic fluid to the actuator at a second pressure that is higher than the first pressure
Implementation Method 3
The hydraulic fluid returning from the actuator to the engine driven pump is delivered to the boost pump prior to reaching the engine driven pump
Data Source
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AI summary
A hydraulic system for an aircraft (10). The hydraulic system includes a hydraulic actuator (60) that is operatively coupled to a flight control member (11). Hydraulic fluid is moved through the hydraulic system by an engine driven pump (21) that delivers hydraulic fluid to the actuator (60) at a first pressure, and a boost pump (23) that delivers hydraulic fluid to the actuator (60) at a second pressure that is higher than the first pressure. The hydraulic system is configured such that the hydraulic fluid returning from the actuator (60) to the engine driven pump (21) is delivered to the boost pump (23) prior to reaching the engine driven pump (21).