Load Limiting Device with Biasing Member for Actuator Protection
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Solution Overview
Problem
Mechanical actuators, such as those used in aircraft wing flaps, can bind due to unexpected forces, leading to increased motor force and potential damage when normal motion is hindered, necessitating a system to limit and monitor applied loads.
Innovation Solution
A device with a body, plate, force-providing member, and sensors that includes biasing members to absorb excessive forces and a controller to manage motor operation based on sensor feedback, preventing damage by limiting applied forces to a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor applies a predetermined force to drive the mechanical actuator, then the actuator can perform its intended function (expand/retract wing flap), but the actuator may bind and become damaged when unexpected forces are applied
Solution Approach 1:
The patent applies beforehand cushioning by introducing a biasing member (spring) that pre-absorbs unexpected forces before they can cause binding or damage. The spring is positioned to compress when excessive force is detected, cushioning the actuator against sudden load spikes from debris or wind forces, thereby protecting the motor and actuator components from damage while maintaining normal operation under expected conditions
2Ease of operation
If the motor continuously applies force to overcome unexpected resistance, then the actuator may overcome binding, but the increased force can cause damage to the actuator and actuated device
Solution Approach 1:
The patent implements feedback by using a sensor to continuously monitor the force applied by the motor and providing this information to the controller. When the sensor detects that the applied force exceeds a predetermined threshold, the controller receives feedback and automatically reduces or stops motor operation, preventing further force application that could cause damage. This closed-loop feedback system ensures the actuator operates within safe force limits while maintaining ease of operation under normal conditions
3Strength
If the motor stops operation when force exceeds threshold, then damage is prevented, but the actuator cannot overcome temporary obstructions
Solution Approach 1:
The patent applies periodic action by implementing a control strategy where the motor operates intermittently rather than continuously. When the sensor detects excessive force, the controller stops motor operation to prevent damage. After a predetermined time interval, the controller may resume operation if the obstruction has cleared, creating a periodic on-off action pattern. This allows the system to protect itself from damage while potentially overcoming temporary obstructions through repeated attempt cycles
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 effectively mitigates damage by absorbing sudden increases in force, allowing the controller to stop motor operation and prevent further damage, thus protecting the actuator and associated components.
Implementation Method 1
a first biasing member disposed between a portion of the body at or about the first end and a portion of the plate, and configured to substantially retain the plate in an initial position during normal operation
Implementation Method 2
the first sensor configured to sense a displacement (e.g., displacement position) with respect to the plate
Data Source
AI summary
A device and system for monitoring a load or applied force includes a body having first and second ends, a plate, a force-providing member connected to the plate, a first biasing member, and a first sensor. In embodiments the first biasing member is disposed between a portion of the body at or about the first end and a portion of the plate, and is configured to substantially retain the plate in an initial position during normal operation of the device; the first sensor is configured to sense a displacement (e.g., displacement position) with respect to the plate; and the body includes a portion configured to connect to or apply a force to another component. A controller may selectively instruct and/or operate a component, such as a motor, in response to an output generated or provided by the sensor. If an excessive force is sensed, the device may mitigate resulting damage.