Multi-Track Weighing Device Acceleration Correction
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Solution Overview
Problem
Multiple-track weighing devices in the pharmaceutical industry face challenges in accurately compensating for disturbing accelerations that do not affect all weighing cells equally, leading to errors in weight signals, and the use of multiple acceleration sensors is costly and inefficient.
Innovation Solution
A weighing device with mechanically rigidly interconnected weighing cells and a single acceleration sensor, where correcting quantities are determined based on the geometric location of each weighing cell relative to the acceleration sensor, allowing for precise correction of weight signals affected by disturbing accelerations, using either analog circuit technology or computational processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single acceleration sensor is used to correct measurement signals of multiple weighing cells, then device complexity and cost are reduced, but measurement precision deteriorates when disturbing accelerations do not affect all weighing cells in the same way
Solution Approach 1:
The patent divides the correction process into cell-specific segments by determining individual correcting quantities for each weighing cell based on its geometric location. The single acceleration sensor's signal is processed differently for each cell, creating cell-specific correction values that account for position-dependent acceleration effects.
Solution Approach 2:
The patent applies local quality by using the geometric location of each weighing cell relative to the acceleration sensor to determine position-specific correcting quantities. Each weighing cell receives a tailored correction based on its specific location, ensuring accurate compensation for local acceleration effects without requiring separate sensors for each cell.
2Measurement precision
If low-pass filters with very low limit frequency are used to improve measurement accuracy, then measurement precision is improved, but productivity decreases due to reduced cycle rate
Solution Approach 1:
The patent introduces an intermediary correction mechanism using acceleration sensors and correcting quantities that acts between the raw measurement signal and the final weight result. This intermediary correction process compensates for disturbing accelerations without requiring aggressive low-pass filtering, thus maintaining both accuracy and high cycle rates.
Solution Approach 2:
The patent replaces the mechanical signal filtering approach (low-pass filters) with a computational correction approach using acceleration sensor data. Instead of mechanically filtering out high-frequency components, the system uses mathematical correction based on detected acceleration disturbances, preserving signal integrity while eliminating the need for slow filtering.
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 enables accurate compensation of disturbing accelerations across all weighing cells, improving the accuracy of weight measurements while maintaining a cost-effective and simple construction, even when accelerations differ between cells.
Implementation Method 1
a single acceleration sensor is arranged on this base plate
Implementation Method 2
the force sensor itself of the weighing cell
Data Source
AI summary
A weighing device with several weighing cells which are rigidly interconnected, and which have a load sensor with a predetermined load insertion direction, with at least one acceleration sensor and with at least one evaluating unit to which the weight signals generated by the weighing cells and the disturbance signals generated by the acceleration sensors can be transmitted. The evaluating unit uses a predetermined rule for each weighing cell to determine a correcting quantity from the disturbance signal of the acceleration sensor(s) as a function of the weighing cell geometric location relative to the geometric location of the acceleration sensor(s), and in that the weight signal, which is affected by the acceleration disturbance(s), of the relevant weighing cell is combined, with the correcting quantity in such a way that the influence of the acceleration disturbance(s) on the weight signal is substantially compensated.