Dual-Resonance Force Sensing for Low- and High-Frequency Machining Loads
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Solution Overview
Problem
Current force measurement devices struggle to simultaneously and accurately measure low-frequency and high-frequency forces during machining processes, which are essential for timely monitoring and compensation control, as they often fail to distinguish between the distinct frequency components of feeding and cutting forces effectively.
Innovation Solution
The force measurement device employs a central portion connected to first and second sensing portions with different natural frequencies, allowing for the measurement of low-frequency and high-frequency forces through adjusted stiffness, enabling natural resonance and enhanced vibration amplitudes for precise force measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensing portion is used to measure both low-frequency and high-frequency forces, then the device complexity is reduced, but the measurement precision deteriorates because the sensing portion cannot distinguish between different frequency components effectively
Solution Approach 1:
The sensing system is divided into multiple sensing portions (first sensing portion for low-frequency forces and second sensing portion for high-frequency forces), each with different natural frequencies. This segmentation allows each portion to specialize in measuring specific frequency ranges, thereby improving measurement precision while maintaining manageable device complexity through functional differentiation.
2Measurement precision
If the natural frequency of the sensing portion is adjusted to match the frequency of the force being measured, then the measurement precision is improved through resonance, but the device complexity increases due to the need for multiple sensing portions with different natural frequencies
Solution Approach 1:
The system employs multiple sensing portions with dynamically different natural frequencies, where each sensing portion is tuned to resonate at a specific frequency range. The first sensing portion has a natural frequency matching low-frequency forces, while the second sensing portion has a natural frequency matching high-frequency forces. This dynamic frequency matching through resonance significantly improves measurement precision for each force type.
3Measurement precision
If multiple sensing portions with different natural frequencies are used to measure different frequency components, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The force measurement device achieves multi-functionality by integrating multiple sensing portions that can simultaneously measure different frequency components of forces. The first sensing portion measures low-frequency forces while the second sensing portion measures high-frequency forces, allowing the device to handle multiple measurement tasks concurrently. This multi-functional approach improves the ability to distinguish frequency components while keeping the overall device structure unified and manageable.
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 allows for improved precision and sensitivity in measuring both low-frequency feeding forces and high-frequency cutting forces, enabling timely monitoring and compensation control, and facilitating condition analysis and diagnosis in machining processes.
Implementation Method 1
The at least one first sensing portion has a first natural frequency... The second sensing portion has a second natural frequency... enabling natural resonance and enhanced vibration amplitudes for precise force measurement
Data Source
AI summary
The disclosure relates to a force measurement device including central portion, fixing portion, first and second sensing portions, and first and second electromechanical elements. The first sensing portion has first natural frequency. The first sensing portion is connected to the central portion. The second sensing portion has a second natural frequency. The second sensing portion is connected to the first sensing portion and the fixing portion. The first electromechanical element is disposed on the first sensing portion to measure a first vibration amplitude. The second electromechanical element is disposed on the second sensing portion to measure a second vibration amplitude. When the central portion is subjected to a first force, the first vibration amplitude is larger than the second vibration amplitude. When the central portion is subjected to a second force, the first vibration amplitude is smaller than the second vibration amplitude.