Force-Torque Sensor Cross-Talk Reduction via Segregated Transducers
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Solution Overview
Problem
Existing multi-component force-torque sensors suffer from significant cross-talk between force and torque measurements, reduced mechanical stability, and high manufacturing complexity, leading to accuracy and sensitivity issues, as well as increased costs.
Innovation Solution
A multi-component force-torque sensing device with a mounting base supporting a force transducer and a torque transducer interconnected by a sensor cross-talk reducing member via adapters, allowing for independent translation of forces and torques without interference, enhancing mechanical stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a load cell and torque sensor are assembled together one on top of another to measure both force and torque simultaneously, then both force and torque can be measured, but cross-talk between the force and torque measurements occurs and the testing setup total length increases
Solution Approach 1:
The sensor assembly is divided into separate force-sensitive and torque-sensitive elements that are spatially segregated. The force-sensitive element measures axial load while the torque-sensitive element measures twisting torque, with each element optimized for its specific measurement function to minimize cross-talk interference.
Solution Approach 2:
A mounting plate serves as an intermediary component between the force-sensitive element and torque-sensitive element. This mounting plate provides a rigid connection interface that isolates the two sensing elements from each other, preventing force measurements from interfering with torque measurements and vice versa.
2Measurement precision
If load cells are designed to withstand uniaxial tensile or compression forces, then they can measure axial load accurately, but they lack immunity against twisting torque causing cross-talk
Solution Approach 1:
The force-sensitive element is designed with local structural features optimized for axial force measurement, such as strain gauge placement and geometric configuration that maximizes sensitivity to uniaxial loads while minimizing response to torsional moments. This localized optimization creates immunity against twisting torque interference.
3Measurement precision
If torque sensors are designed to measure twisting torque, then they can measure reaction torque accurately, but they have significant sensitivity to applied axial load causing cross-talk
Solution Approach 1:
The torque-sensitive element is designed with local structural features optimized for torsional measurement, such as strain gauge placement on surfaces that experience pure shear stress during twisting. This localized design creates insensitivity to axial load while maintaining high torque measurement accuracy.
4Volume of moving object
If multi-component sensing devices with multi-beam elastic members are used to reduce dimensions, then the testing setup size decreases, but manufacturing complexity and cost increase
Solution Approach 1:
The force-sensitive element and torque-sensitive element are merged into a single integrated sensor assembly that shares common structural components, such as the mounting plate and housing. This merging reduces the overall volume and simplifies manufacturing while maintaining the ability to measure both force and torque independently with minimal cross-talk.
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 solution significantly reduces cross-talk, improves measurement accuracy, and increases the dynamic range of forces and torques measured, while being more cost-effective and mechanically stable.
Implementation Method 1
Various types of sensing devices based on strain-gauges and other techniques for monitoring and controlling the magnitude of applied forces and measuring torques are known in the art
Data Source
AI summary
A multi-component force-torque sensing device contains force- and torque-sensitive elements mounted on a common base so that the axis of rotation of the measured torque coincides with the direction of action of the force being measured. The force and the torque are applied to a test specimen holder simultaneously. For reducing cross-talk between the sensitive elements installed on the base the test specimen holder is connected to the sensitive elements via a cross-talk reducing member with respective adapters which translate the force and the torque to the sensitive elements independently, without affecting or disturbing each other measurements.