Mass Flow Sensor Friction Compensation via Pivot Alignment
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Solution Overview
Problem
Existing mass flow measurement devices fail to achieve accurate measurements due to uncompensated friction effects between mass particles and the guide plate, lacking a quantitative method to determine the pivot point for precise force compensation.
Innovation Solution
The guide means are pivotally supported on a straight line aligned with the resulting friction force, allowing for friction force compensation, with the support point determined by the friction force and material-dependent quantities, ensuring the force sensor measures only the centripetal force by orienting the force measurement direction perpendicular to the resulting friction force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide means are pivotally supported with a predefined pivot point location, then the friction effects are substantially compensated, but the measurement precision is not sufficient for exact mass flow measurement
Solution Approach 1:
The invention changes the parameter of pivot point location from a predefined qualitative position to a quantitatively determined position based on material-dependent friction coefficients. By calculating the exact pivot point location using the formula that incorporates the friction coefficient μ, the system achieves both friction compensation and high measurement precision simultaneously.
Solution Approach 2:
The invention replaces the conventional mechanical approach of empirically defining the pivot point with a mathematical calculation system. By using the derived formula that incorporates friction forces and geometric parameters, the system transitions from mechanical trial-and-error positioning to precise mathematical determination, enabling exact mass flow measurement.
2Ease of manufacture
If the pivot point is determined using conventional qualitative methods, then the device is simpler to manufacture, but the measurement accuracy is insufficient
Solution Approach 1:
The invention performs preliminary calculation of the pivot point location before actual measurement, using material-dependent friction coefficients and geometric parameters. This pre-determination eliminates the need for complex iterative adjustments during manufacturing while ensuring measurement accuracy, as the pivot point is precisely calculated based on known material properties.
3Device complexity
If the force sensor measures forces in the conventional direction, then the device structure is simpler, but friction forces affect the measurement results
Solution Approach 1:
The invention introduces asymmetric orientation of the force sensor, positioning it at a specific angle relative to the guide means rather than in a conventional symmetric position. This asymmetric placement, determined by the friction coefficient and geometric parameters, allows the sensor to measure only the centripetal force component perpendicular to the friction force, eliminating friction interference.
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 approach enables more accurate mass flow measurement by isolating centripetal forces from friction forces, providing a quantitative method for pivot point determination and improving measurement precision.
Implementation Method 1
During the flow across the guide means, a mass flow flowing across the guide means experiences a centripetal force that is proportional to the moving mass
Implementation Method 2
a force in the opposite direction counteracts the centripetal force applied by the guide means on the moving mass, which in conjunction with the friction forces generated by the mass particles produces a pivoting motion of the guide means
Data Source
AI summary
A device for measuring a mass flow (5) with guide means (4) having a surface shaped as a circular arc, across which the mass flow can flow during the measurement, and a force sensor (2), wherein the guide means (4) is supported above the force sensor (2) and the support occurs on a straight line extending through an endpoint of a radius vector TO of a resulting friction force F acting on the mass flow (5) in the direction of the resulting friction force F acting on the mass flow (5).