Displacement Sensor Wear Reduction via Dynamic Mode Switching
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Solution Overview
Problem
Conventional displacement sensors in aircraft brake systems fail due to excessive wear caused by vibrations at contacting surfaces, which affects their accuracy and reliability.
Innovation Solution
A dual-mode potentiometer that toggles between a parked mode and a sensing mode based on user input actuation, featuring an electrically nonconductive wiper lift element to prevent wear by maintaining a gap between the wiper and resistive elements in the parked mode, and sliding electrical contact in the sensing mode to measure displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the displacement sensor operates in continuous sensing mode, then displacement measurement is available, but excessive wear occurs due to vibrations at contacting surfaces
Solution Approach 1:
The displacement sensor dynamically switches between two operational modes: parked mode where the wiper element is separated from the resistive element to prevent wear, and sensing mode where the wiper element contacts the resistive element to measure displacement. This dynamic mode switching resolves the contradiction by allowing the sensor to maintain accuracy when needed while preventing wear during normal operation.
Solution Approach 2:
The sensor employs periodic engagement of the wiper element with the resistive element rather than continuous contact. The controller activates sensing mode periodically or on-demand based on whether displacement measurement is required, thereby reducing cumulative wear while maintaining measurement capability when needed.
2Duration of action of moving object
If the wiper element is separated from the resistive element, then wear is prevented, but displacement measurement capability is lost
Solution Approach 1:
The system dynamically transitions between separated and contacted states of the wiper element based on operational requirements. The controller monitors system state and activates the sensing mode when displacement measurement is needed, ensuring measurement precision is maintained when required while service life is extended through separation during normal operation.
Solution Approach 2:
The wiper lift element is introduced to extract or separate the wiper element from continuous contact with the resistive element. This separation eliminates wear during normal operation, and the system selectively re-engages the wiper element only when displacement measurement functionality is required.
3Measurement precision
If the displacement sensor uses contacting surfaces for measurement, then displacement can be measured, but excessive wear occurs due to vibrations
Solution Approach 1:
The wiper lift element acts as an intermediary component that controls the interaction between the wiper element and resistive element. It enables the system to maintain measurement precision through controlled electrical contact while protecting against vibration-induced wear by allowing separation when measurement is not required.
Solution Approach 2:
The contact state between measuring surfaces is made dynamic rather than static. The controller adjusts the position of the wiper element relative to the resistive element based on whether displacement measurement is needed, thereby eliminating continuous vibration-induced wear while maintaining measurement precision on-demand.
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
Prevents wear and maintains sensor accuracy by only engaging the sensing mode when necessary, ensuring reliable displacement measurement and reducing maintenance needs.
Implementation Method 1
an electrically nonconductive wiper lift element that is disposed between the wiper element and the resistive element in the parked mode. The electrically nonconductive wiper lift element may have an angled surface along which the wiper element slides
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A displacement sensor includes a resistive element (312) and a wiper element (314). The wiper element is separated from the resistive element in a parked mode the wiper element is in sliding electrical contact with the resistive element in a sensing mode. A user input interface (205) may be coupled to at least one of the resistive element and the wiper element, wherein whether the displacement sensor is in the parked mode or the sensing mode is dependent on actuation of the user input interface.