Aerial Dump Gate Linkage for Lighter Retardant Flow Control
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Solution Overview
Problem
Firefighting aircraft dump gate systems using hydraulics are heavy, introduce dynamic system complexities, and pose maintenance and reliability issues, necessitating an improved control system for efficient fire retardant release.
Innovation Solution
An electrically driven mechanical gate system with an electric linear actuator and linear drive controller, utilizing over-center geometry and phase-synchronized gate operation to control fluid flow, reducing weight and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic control system is used to operate the dump gate, then the gate position can be firmly and quickly controlled, but the system becomes heavier and introduces maintenance issues and reliability concerns
Solution Approach 1:
The patent replaces the hydraulic mechanical system with an electric motor-driven system. The electric motor (158) directly drives the dump gate through a mechanical linkage system, eliminating hydraulic pumps, actuators, reservoirs, pipes and fittings. This substitution reduces weight while maintaining reliable gate position control through electrical actuation and feedback control.
Solution Approach 2:
The patent extracts and removes the hydraulic subsystem components from the dump gate system. By taking out the hydraulic pump, actuators, reservoir, pipes and fittings, the system achieves weight reduction while the core gate control function is maintained through the electric motor-driven mechanical linkage system.
2Force
If a hydraulic control system is used to operate the dump gate, then substantial forces can be applied to the gates, but the system complexity increases and maintenance requirements arise
Solution Approach 1:
The patent replaces the complex hydraulic force transmission system with a simpler electric motor-driven mechanical linkage system. The electric motor (158) generates rotational force that is transmitted through gears (160, 162) and a crank mechanism to the connecting rod (26), which applies force to the dump gate. This mechanical substitution reduces system complexity while maintaining the ability to apply substantial forces.
3Measurement precision
If hydraulics are used for dump gate operation, then precise position control can be achieved, but the system introduces leaking potentials and dynamic system issues
Solution Approach 1:
The patent replaces the hydraulic system with an electrically-driven system that eliminates leaking potentials. The electric motor (158) with feedback control provides precise gate position control without the reliability issues of hydraulic leaks. The mechanical linkage system (crank arm 22, connecting rod 26) translates motor rotation into precise gate positioning.
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
The system enhances the efficiency and reliability of fire retardant release by minimizing weight, reducing maintenance, and improving control over fluid flow, while ensuring safe emergency dump operations.
Implementation Method 1
An electric linear actuator, that includes a linear electric driver and an actuator rod. The linear electric operates to extend and retract the actuator rod
Implementation Method 2
A first crank arm is fixed to the first drive shaft and coupled to the first gate by a first connecting link. A first drive crank fixed to the shaft extension
Data Source
AI summary
A dump gate system for a fluid hopper in a firefighting aircraft. A gate sealably engages a gate opening in the hopper at a closed position. The gate is hingedly connected about the gate opening, and a drive shaft is supported within the hopper. A crank arm is fixed to the drive shaft and is further coupled to the gate by a connecting link. The crank arm and the connecting link define an over-center geometry while the gate is at the closed position, such that weight of the fluid on the gate induces torque on the drive shaft in a gate-closing direction. A linear electric motor is selectively coupled to rotate the drive shaft in a gate-opening direction to thereby enable control of the fluid flow from the hopper according to an angular position of the drive shaft.