Force Measurement System With Crosstalk Correction
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Solution Overview
Problem
Conventional load transducers face limitations in accurately measuring forces and moments due to issues like crosstalk between channels, sensitivity to ambient temperature, and variability in measurement accuracy based on load position, leading to the need for a more versatile and accurate force measurement system that can correct for these issues and be used with various force plate sizes.
Innovation Solution
A force measurement system comprising a modular load transducer beam with deformation sensing elements sensitive to different force components, coupled with a data processing device that determines output forces and corrects for crosstalk and temperature effects, allowing for accurate force measurement regardless of load position and enabling assessment of balance parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional load transducers are used to measure forces and moments, then the measurement system can function with standard transducer designs, but the measurement accuracy deteriorates due to crosstalk between channels and sensitivity to ambient temperature
Solution Approach 1:
The transducer is divided into multiple independent load channels, each equipped with dedicated strain gages and measurement circuits. This segmentation isolates the measurement of different force components (Fx, Fy, Fz, Mx, My, Mz), preventing crosstalk between channels and improving measurement precision for each component.
Solution Approach 2:
The system incorporates temperature compensation mechanisms that continuously monitor ambient temperature and adjust the measurement readings accordingly. This feedback approach corrects for thermal expansion and resistance changes in strain gages, eliminating temperature sensitivity errors.
2Adaptability or versatility
If conventional load transducers are mounted on force plates, then the system can measure forces, but the transducers must be custom-designed for each force plate size, increasing manufacturing complexity and cost
Solution Approach 1:
The load transducer is designed with a universal mounting interface and modular structure that allows it to be adapted to force plates of different sizes and shapes. The transducer can be configured for various footprint dimensions without requiring custom design, reducing manufacturing complexity and enabling a single design to serve multiple applications.
3Area of stationary object
If conventional load transducers span the full length or width of force plates, then they can provide complete coverage, but they use excessive material and increase the device size
Solution Approach 1:
The transducer design transitions from spanning the full length or width of the force plate to a more compact configuration that utilizes vertical positioning and strategic placement. This dimensional optimization allows the transducer to measure forces across the entire force plate area without requiring excessive material, reducing weight while maintaining measurement capability.
4Force
If conventional transducers are used with forces applied at offsets greater than half the diameter, then the system can handle larger moment capacities, but the measurement accuracy deteriorates
Solution Approach 1:
The transducer incorporates multiple strain gage rosettes positioned at different locations and orientations to independently measure force components and moment components. This segmentation allows accurate measurement even when forces are applied at large offsets from the center, as each gage configuration is optimized for specific measurement zones.
Solution Approach 2:
The system employs different strain gage configurations and orientations (0 degrees, 45 degrees, 90 degrees) to capture force and moment components. By changing the measurement parameters through different gage arrangements, the transducer maintains accuracy across various offset positions and loading conditions.
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
The system provides improved accuracy and versatility in force measurement, reducing errors caused by crosstalk and temperature variations, and enabling accurate load assessment across different force plate sizes and shapes, including those with non-standard shapes and near the periphery.
Implementation Method 1
A transducer can incorporate one or more load channels. Each load channel measures one of the load components, and is comprised of one or more strain gages mounted to one or more elastic elements that deform under the applied load. An appropriate circuitry relates the resistance change in each set of gages to the applied force or moment.
Implementation Method 2
one or more strain gages mounted to one or more elastic elements that deform under the applied load
Data Source
AI summary
A force measurement system is disclosed herein. The force measurement system includes a force measurement assembly with at least one load transducer beam having a load transducer frame portion, and a plurality of deformation sensing elements disposed on the load transducer frame portion, a first one of the plurality of deformation sensing elements being sensitive to a first force component of the load and outputting a first output signal representative of the first force component of the load, and a second one of the plurality of deformation sensing elements being sensitive to a second force component of the load and outputting a second output signal representative of the second force component of the load, the first force component of the load being different from the second force component of the load; and a data processing device operatively coupled to the plurality of deformation sensing elements of the load transducer beam.