Brake Control Valve Vibration Isolation Mounting
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Solution Overview
Problem
Conventional aircraft brake control valves, especially brake-by-wire systems, are prone to damage from severe random vibrations due to hard mounting, leading to unsatisfactory performance or failure, particularly in environments like aircraft wheel wells and near landing gear where vibrations resonate at frequencies damaging the flapper nozzle.
Innovation Solution
Incorporating shock and vibration isolators in the mounting feet of the brake control valve manifold with a predetermined natural frequency, above or below the 300 to 500 Hz range, to absorb and dampen vibrations, using silicone rubber inserts with metal sheaths to isolate and protect the valve components from direct transmission of structural vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If hard mounting is used to secure the brake control valve, then structural stability is improved, but vibration resistance deteriorates due to resonance damage at 300-500 Hz
Solution Approach 1:
The patent introduces an isolator as an intermediary component between the brake control valve and the mounting structure. This isolator has a natural frequency of 10-50 Hz, which is significantly lower than the damaging 300-500 Hz resonance range of the flapper nozzle, thereby mediating the vibration transmission and protecting the valve from resonant damage while maintaining structural stability.
2Speed
If mounting location is moved closer to brake pistons (wheel well/landing gear), then system response time is improved, but exposure to harmful vibrations increases
Solution Approach 1:
The isolator serves as a protective intermediary that enables the brake control valve to be mounted in severe vibration environments such as wheel wells or near landing gear. By filtering out harmful vibrations through its low natural frequency (10-50 Hz), the isolator allows the valve to benefit from shorter hydraulic line lengths and faster system response without suffering from increased vibration exposure.
3Weight of moving object
If valve structure is made less rigid to reduce stresses, then weight is reduced, but susceptibility to vibration damage increases
Solution Approach 1:
The isolator acts as an external protective intermediary that compensates for the reduced inherent vibration resistance of lighter, less rigid valve structures. By placing the isolator between the valve and the mounting structure, the system can use weight-reduced valve designs while the isolator protects against vibration damage, effectively decoupling the weight reduction benefit from the vibration susceptibility penalty.
4Ease of manufacture
If conventional hard mounting is used, then manufacturing simplicity is maintained, but component damage from resonance occurs
Solution Approach 1:
The isolator is designed as a relatively simple component that can be integrated into the mounting feet of the brake control valve manifold. This intermediary element adds minimal manufacturing complexity while dramatically improving component durability by preventing resonant damage through its low natural frequency (10-50 Hz) that avoids the 300-500 Hz damage range.
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 solution effectively isolates the brake control valve from harmful vibrations, preventing damage and allowing for reliable operation in severe environments, enabling co-location of brake control electronics for improved signal processing and weight savings by reducing structural stresses.
Implementation Method 1
shock and vibration isolators have a pre-selected, predetermined natural frequency operative to protect components of the brake control valve from random vibration
Implementation Method 2
The shock and vibration isolators have a natural frequency selected to protect components of the brake control valve from random vibration and to avoid gun fire sinusoidal frequencies
Implementation Method 3
using silicone rubber inserts with metal sheaths to isolate and protect the valve components from direct transmission of structural vibrations
Data Source
AI summary
The shock and vibration isolation system for hard mounting of a manifold of a brake control valve protects the brake control valve manifold from shock and vibration by incorporation of shock and vibration isolators in mounting feet of the manifold. The shock and vibration isolators have a pre-selected natural frequency chosen to protect components of the brake control valve damaging shock and vibration. The shock and vibration isolators each include a silicone rubber insert portion, a first outer sheath secured about a first end of the silicone rubber insert portion, a second outer sheath member secured about a second end of the silicone rubber insert portion, with a gap between the first and second outer sheaths.