Bond Tester Force Measurement Using Spring Mass Damper Model
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Solution Overview
Problem
Existing force measurement methods using sensors with elastic elements fail to accurately account for damping forces and accelerations, leading to errors and 'ringing' artifacts, especially when forces change rapidly, and do not effectively filter out noise-induced artifacts.
Innovation Solution
A 'spring mass damper' model is used to calculate force by incorporating the sensor's mass, damping coefficients, and acceleration, allowing for dynamic calibration that accounts for first and second-order differentials of displacement, reducing errors and artifacts by considering the dynamic characteristics of the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple elastic element model is used for force measurement, then the device complexity is low, but the measurement precision deteriorates due to inability to account for damping and acceleration effects
Solution Approach 1:
The patent transforms the static elastic element model into a dynamic spring-mass-damper model by introducing additional parameters (mass, damping coefficient) and considering time-dependent variables (acceleration, velocity). This parameter expansion enables accurate force measurement during dynamic conditions while maintaining a relatively simple physical sensor structure.
Solution Approach 2:
The patent introduces computational processing as an intermediary between the physical sensor output and the final force measurement. By using a microprocessor to calculate force from displacement, velocity, and acceleration data according to the spring-mass-damper equations, the system achieves high measurement precision without complicating the physical sensor design.
2Reliability
If signal filtering is applied to reduce noise, then the reliability of measurement improves, but ringing artifacts are introduced that worsen measurement precision
Solution Approach 1:
The patent converts the harmful ringing artifacts introduced by filtering into beneficial information by using the spring-mass-damper model to identify and subtract them. The model distinguishes between actual dynamic force changes and filtering-induced oscillations, allowing the system to maintain both noise resistance and measurement accuracy.
Solution Approach 2:
The patent implements a feedback mechanism where the measured displacement and its derivatives (velocity, acceleration) are continuously fed into the spring-mass-damper model to calculate the actual force. This closed-loop approach allows real-time correction of measurement errors and dynamic compensation for system behavior, maintaining precision throughout the measurement process.
3Measurement precision
If dynamic calibration is implemented to account for mass and damping, then the measurement precision improves, but the ease of operation deteriorates due to increased calibration complexity
Solution Approach 1:
The patent enables the sensor system to perform its own dynamic calibration by using the microprocessor to automatically calculate the mass and damping coefficient parameters from the spring-mass-damper model. This self-calibrating capability eliminates the need for complex external calibration equipment and procedures, making the system both precise and easy to operate.
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 significantly improves the accuracy of force measurement by reducing oscillations and filter artifacts, providing more precise results in bond testing and materials testing, with corrections that can minimize errors up to 45% and reduce noise-induced oscillations.
Implementation Method 1
a sensor component (802) arranged for measuring a displacement of the sensor component (802) caused by the applied force
Implementation Method 2
A 'spring mass damper' model is used to calculate force by incorporating the sensor's mass, damping coefficients, and acceleration
Implementation Method 3
A 'spring mass damper' model is used to calculate force by incorporating the sensor's mass, damping coefficients, and acceleration
Data Source
AI summary
A method for testing a bond using a bond tester apparatus, the method comprising the steps of applying a mechanical force to the bond, determining, by a sensor component comprised by the bond tester apparatus, the applied force to the bond by measuring, by the sensor component, a displacement of the sensor component caused by the applied force and calculating, by the sensor component, the applied force on the basis of a first component which comprises a direct relationship with the measured displacement and on the basis of at least one of a second component, a third component and a fourth component.