Railway Optical Odometer Vibration Damping
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Solution Overview
Problem
Optical odometers on railway vehicles experience a high failure rate and shorter lifespan due to dust deposition on optical sensors caused by vibrations, leading to friction and wear between the electronic card and casing, which degrades their functionality.
Innovation Solution
The introduction of additional mechanical coupling means, such as a metallic plate with adhesive layers and foam, to connect optical cells together, reducing harmful vibrations and shifting natural vibration modes out of the stress frequency spectrum, thereby protecting the optical sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical cells are mounted in the casing without additional coupling means, then the device complexity is low, but the reliability deteriorates due to vibrations causing friction and dust deposition on sensors
Solution Approach 1:
The patent merges the optical cells with the casing by introducing additional coupling means that mechanically connect the cells to the casing structure. This integration reduces relative vibrations between components, preventing friction and dust deposition on optical sensors, thereby resolving the reliability issue without significantly increasing overall device complexity
Solution Approach 2:
The coupling means are pre-installed on the casing before the optical cells are mounted. This preliminary action ensures that the vibration-dampening structure is already in place, preventing harmful vibrations from the outset and eliminating the need for post-assembly modifications that would increase complexity
2Reliability
If additional coupling means are added to mechanically connect optical cells, then the reliability improves by attenuating vibrations, but the device complexity increases
Solution Approach 1:
The coupling means are applied locally only at the mounting positions of the optical cells, rather than throughout the entire device. This localized approach provides vibration attenuation exactly where needed (at the sensor mounting points) without adding unnecessary complexity to other parts of the device
Solution Approach 2:
The coupling means utilize composite construction combining different materials (such as adhesive layers, foam, and metallic elements) to achieve optimal vibration damping properties. This composite approach provides effective vibration attenuation while keeping each individual component simple and the overall device complexity manageable
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
This solution significantly increases the reliability and lifespan of optical odometers by attenuating vibrations and preventing dust accumulation on the sensors, ensuring improved operational performance.
Implementation Method 1
The introduction of additional mechanical coupling means, such as a metallic plate with adhesive layers and foam, to connect optical cells together
Implementation Method 2
reducing harmful vibrations and shifting natural vibration modes out of the stress frequency spectrum
Data Source
Figure 1
AI summary
This optical odometer (10) of the type having a globally symmetrical shape by rotation about an axis (A), comprising a half-shaft (12) movable in rotation about said axis, intended to be coupled to a hub of a wheel of a railway vehicle, and a housing (14), intended to be coupled to a fixed part of said railway vehicle, the housing internally delimiting a chamber (20) in which are housed a disc (22), fixed to the half-shaft; and a plurality of optical cells (30), each optical cell being fixed to a wall of the housing by a mounting means (40), the plurality of optical cells being adapted to cooperate with the disc to deliver a measurement of a quantity corresponding to a speed of rotation of the half-shaft relative to the housing, characterized in that the cells of the plurality of cells (30) are, in addition, mechanically coupled to each other by an additional connecting means (50).