No-Back Brake Modulating Spring for Chatter Damping
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Solution Overview
Problem
No-back brakes in actuator systems are susceptible to chatter during high energy aiding loading operations, leading to early wear-out, performance degradation, and increased maintenance costs.
Innovation Solution
Incorporating a modulating spring within the no-back brake that applies a progressive compressive force to the brake section during axial displacement, mitigating chatter through damping, and tuned for specific load conditions using conically shaped springs and cylindrical washers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a no-back brake is used to provide protection from backdriving, then safety is improved, but excessive chatter results in increased maintenance costs and down-time
Solution Approach 1:
The spring element provides beforehand cushioning to the brake system, absorbing shock loads and preventing chatter-induced wear before it occurs. This proactive damping approach reduces component wear and extends maintenance intervals, decreasing maintenance down-time while maintaining safety.
2Reliability
If a modulating spring is added to reduce chatter, then performance and reliability are enhanced, but device complexity increases
Solution Approach 1:
The spring element serves multiple functions simultaneously: it acts as a cushioning element to reduce chatter, a damping element to absorb vibrations, and a force modulation element to control brake lining engagement. This multi-functionality enhances reliability without proportionally increasing complexity, as a single component addresses multiple problem areas.
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 modulating spring effectively reduces chatter and oscillations in the no-back brake, enhancing its performance and operational reliability during aiding load operations.
Implementation Method 1
a modulating spring, coupled to the shaft and coupled to the brake, configured to compress in response to the brake being displaced, wherein the modulating spring is configured to apply a selective compressive force at the brake corresponding to a distance the brake is displaced
Implementation Method 2
The modulating spring is compressed by the axial displacement of the brake, and provides a compressive force against the brake section (e.g., damping) to mitigate chatter within the no-back brake
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Methods and systems according to one or more examples are provided for reducing chatter in a no-back brake during aiding load operations. In one example, an apparatus comprises a no-back brake (101), disposed within an actuator (102) coupled to an aircraft, including a shaft (225), and a ball ramp plate (215), coupled to the shaft, to receive a force comprising an air loading force and is displaced responsive to the force. The apparatus further comprises a brake (205), coupled to the shaft (225) and coupled to the ball ramp plate (215), and displaced by the ball ramp plate corresponding to a distance the ball ramp plate is displaced. The apparatus further comprises a modulating spring (201), coupled to the shaft and coupled to the brake, configured to compress in response to the brake being displaced, and the modulating spring is configured to apply a selective compressive force at the brake corresponding to a distance the brake is displaced.