Multidimensional Resonant Force Sensor with Integrated Sensitive Elements
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Solution Overview
Problem
Current resonant force sensors are limited in measuring all six dimensions of force and torque components simultaneously, requiring multiple unitary sensors and complex configurations, which are expensive and not economical.
Innovation Solution
A multidimensional resonant force sensor design featuring a proof body with sensitive elements, each comprising a plate embedded in a frame with localized mass increases at corners, capable of resonating at specific frequencies, allowing measurement of force components through resonant frequency shifts, using piezoelectric transducers and phase-locked loop circuits to determine torque components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple unitary resonant sensors are added to measure all force components, then measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple measurement functions into a single integrated sensor body. The proof body contains multiple sensitive elements (first, second, and third sensitive elements) that simultaneously measure different force components (Fx, Fy, Fz, Mx, My, Mz) through their respective resonant frequency shifts, eliminating the need for multiple separate sensors
Solution Approach 2:
The single sensor device achieves multi-functionality by incorporating multiple sensitive elements with different orientations and measurement principles within one proof body, allowing it to measure all six force components (three forces and three torques) simultaneously, making one sensor replace multiple unitary sensors
2Adaptability or versatility
If multiple unitary resonant sensors are added to measure all force components, then measurement capability is improved, but cost increases
Solution Approach 1:
The patent merges multiple measurement functions into a single integrated sensor body. The proof body contains multiple sensitive elements (first, second, and third sensitive elements) that simultaneously measure different force components (Fx, Fy, Fz, Mx, My, Mz) through their respective resonant frequency shifts, eliminating the need for multiple separate sensors
Solution Approach 2:
The single sensor device achieves multi-functionality by incorporating multiple sensitive elements with different orientations and measurement principles within one proof body, allowing it to measure all six force components (three forces and three torques) simultaneously, making one sensor replace multiple unitary sensors
3Measurement precision
If resonant frequency shifts are measured to determine force components, then measurement precision is improved, but measurement noise increases
Solution Approach 1:
The patent uses mechanical resonance of sensitive elements to detect force components. Each sensitive element has a natural resonant frequency that shifts in response to applied forces and torques. By measuring these frequency shifts rather than direct displacement or strain, the system achieves high precision while avoiding low-frequency noise and drift issues
Solution Approach 2:
The patent employs feedback control through phase-locked loop (PLL) circuits that track the resonant frequencies of the sensitive elements. The PLL circuits continuously adjust the excitation frequency to match the resonant frequency, providing real-time feedback that compensates for frequency drift and maintains measurement accuracy, thereby reducing noise in the measurement signal
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 reliable and economical measurement of all six dimensions of force and torque components, improving sensitivity and reducing measurement noise by filtering out unwanted frequencies and modal deformations.
Implementation Method 1
each plate being able to resonate under the effect of local mechanical excitations produced at particular points by excitation transducers
Implementation Method 2
using piezoelectric transducers and phase-locked loop circuits to determine torque components
Implementation Method 3
measurement means measuring the resonant frequency shifts of signals which are linear combinations of the resonant signals picked up, said shifts being a function of mechanical stresses induced by said forces
Data Source
AI summary
A resonant sensor includes a proof body that can be subjected to a torque of forces produced by an external mechanical structure, the body comprising at least: a first interface and a second interface that can each come into contact with the structure; at least two sensitive elements each arranged between these two interfaces; a sensitive element comprising a plate embedded in a frame secured mechanically to the interfaces, the frame being fixed to the interfaces by two opposite corners, the other two corners being free, a local increase in weight being produced in each corner; each plate being able to resonate under the effect of local mechanical excitations produced at particular points by excitation transducers bearing the plate at several resonant frequencies, sensors picking up the resonant signals produced at the particular points, measurement means measuring the resonant frequency shifts of signals which are linear combinations of the resonant signals picked up, the shifts being a function of mechanical stresses induced by the forces and transmitted to the plate by the frame, the components of the torque of forces being determined from the resonant frequency shifts measured on the plates of the sensitive elements.