Measuring Wheel Slipperiness Detection via Hydraulic Braking
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Solution Overview
Problem
Existing floor slipperiness measurement devices cannot detect contaminants on the ground surface, limiting their accuracy in determining slipperiness.
Innovation Solution
Incorporating a hydraulic retarder for the measuring wheel and force sensors to measure longitudinal reactions, allowing for the detection of contaminants by comparing braking torque and drag force measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mechanical disc brake is used to control the measuring wheel, then the device can maintain constant sliding rate, but it cannot detect contaminants on the ground surface
Solution Approach 1:
The patent combines multiple measurement functions into a single integrated device. The measuring wheel simultaneously measures both the braking force (for slipperiness) and the longitudinal reaction (for contaminant detection) through integrated force sensors, allowing both parameters to be obtained from one measurement system rather than separate devices
Solution Approach 2:
The measuring wheel is designed to perform multiple functions: it serves as both the measurement element for slipperiness (through braking force measurement) and as a probe for contaminant detection (through longitudinal reaction measurement). This multi-functional design allows the single device to provide comprehensive ground surface information
2Loss of information
If force sensors are added to measure longitudinal reaction, then contaminant detection is enabled, but device complexity increases
Solution Approach 1:
The patent combines multiple measurement functions into a single integrated device. The measuring wheel simultaneously measures both the braking force (for slipperiness) and the longitudinal reaction (for contaminant detection) through integrated force sensors, allowing both parameters to be obtained from one measurement system rather than separate devices
Solution Approach 2:
The measuring wheel itself serves as the measurement probe for both functions. The wheel's interaction with the ground surface naturally generates both the braking force and longitudinal reaction signals, eliminating the need for separate probing mechanisms or additional complex sensor systems
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
Enables accurate determination of slipperiness and contaminant thickness, improving measurement precision and reliability.
Implementation Method 1
the measuring wheel is braked by means of a hydraulic retarder in such a way that it rolls with a constant rate of slip
Implementation Method 2
the degree of slipperiness of the ground being deduced from the measurement of the braking force applied to the measuring wheel by a torque sensor
Implementation Method 3
two force sensors for measuring a longitudinal reaction applied to said measuring wheel
Implementation Method 4
the measuring wheel is braked in such a way that it rolls with a constant slip rate, the degree of slipperiness of the ground then being deduced from the measurement of the braking force
Data Source
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AI summary
The device has force sensors (54) utilized to measure longitudinal reaction applied to a measuring wheel (12) at the intersection of a horizontal plane (P1) and a vertical plane (P2). The horizontal plane comprises an axle (13) of the measuring wheel and the vertical plane comprises superimposed axles (10-1, 10-2) of a pivot connection on both sides of an oscillating frame (8), where the measuring wheel is stopped using a hydraulic compression unit i.e. hydraulic servo-motor, such that the measuring wheel rolls with constant skidding rate.