Leaf Spring Force Device Perpendicular Rigidity
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Solution Overview
Problem
Existing devices for high-precision generation and measurement of forces and displacements lack sufficient rigidity perpendicular to the axis, leading to inaccuracies and reproducibility issues, especially when dealing with small forces and displacements, and are susceptible to electromagnetic interference.
Innovation Solution
A device utilizing biased and clamped leaf springs on both sides of a force-transferring shaft, with adjustable biasing elements and integrated LVDT transducers for precise force and displacement measurement, providing high rigidity in the perpendicular direction and immunity to electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If biased and clamped leaf springs are used on both sides of the force-transferring shaft, then rigidity perpendicular to the axis is improved, but device complexity increases
Solution Approach 1:
The support structure is segmented into multiple leaf springs (at least two) positioned on opposite sides of the shaft. Each leaf spring is independently clamped and biased, creating a modular configuration that distributes the rigidity function across multiple components rather than requiring a single complex structure.
Solution Approach 2:
The leaf springs are configured with asymmetric clamping and biasing arrangements where the biasing force is applied perpendicular to the shaft axis. This asymmetric configuration optimizes the rigidity in the perpendicular direction while maintaining simplicity in the axial direction where movement is required.
2Measurement precision
If adjustable biasing elements are used to bias the leaf springs, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The biasing elements are configured to pre-bias the leaf springs before measurement begins. This preliminary action establishes a known initial state and eliminates the need for complex real-time calibration during operation, thereby improving measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The biasing force of the leaf springs can be adjusted by modifying parameters such as the pre-tension in the biasing elements or the geometric configuration of the clamping arrangement. This allows optimization of measurement precision through parameter adjustment rather than requiring complex additional components.
3Measurement precision
If LVDT transducers are integrated for force and displacement measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The LVDT transducers are integrated directly into the existing leaf spring and shaft structure. The transducer components are merged with the mechanical elements already present in the device, allowing force and displacement measurements to be obtained without adding separate, independent measurement systems.
4Ease of manufacture
If the device structure is simplified, then ease of manufacture is improved, but rigidity perpendicular to the axis deteriorates
Solution Approach 1:
The leaf springs function as thin, flexible elastic elements that provide the necessary rigidity in the perpendicular direction through their elastic properties rather than through massive rigid structures. This allows the device to maintain high rigidity where needed while using thin, easy-to-manufacture components.
Solution Approach 2:
The rigidity of the leaf springs can be optimized by changing parameters such as the thickness, width, length, and material properties of the springs. This allows the achievement of required perpendicular rigidity through parameter optimization of simple components rather than through complex structural designs.
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 enables reliable and reproducible generation and measurement of forces and displacements with high precision, suitable for both small and large forces, while preventing displacement in the perpendicular direction and eliminating electromagnetic interference concerns.
Implementation Method 1
The displacement is determined by way of an inductance change of a coil
Implementation Method 2
the force-transferring shaft is attached to at least two first leaf springs that are biased and are clamped in on both sides. The first leaf springs are biased in a direction towards the Y axis
Data Source
AI summary
A device for high precision generation and measurement of forces (both pressure and tension) and displacements along a single axis includes a shaft for transferring the forces along an axis X. At least two biased first leaf springs are attached to the shaft and clamped at each end. The device has great rigidity in an axis Y perpendicular to the axis X in which the forces and displacements are generated.