Position Measuring Device Vibration Detection
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Solution Overview
Problem
Existing position measuring devices face challenges in accurately determining the instantaneous bending of machine components caused by vibrations, leading to positioning errors due to reliance on temporal analysis and dynamic models that can be inaccurate and introduce latency in control systems.
Innovation Solution
A position measuring device with multiple scanning units arranged in a configuration that allows for simultaneous detection of vibrations and position measurements in multiple degrees of freedom, enabling direct measurement of vibration-related deflections without relying on complex models, thus providing instantaneous feedback and reducing latency in control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temporal analysis and dynamic models are used to detect vibrations, then vibration detection is possible, but measurement precision and response speed deteriorate due to latency and model inaccuracies
Solution Approach 1:
The system segments the vibration detection function by adding dedicated scanning units that specifically measure vibration-related deflections separate from position measurement. This allows simultaneous independent detection of both position and vibration without temporal analysis, eliminating the latency inherent in using position data for vibration detection.
Solution Approach 2:
The patent introduces specialized scanning units as intermediary measurement devices that directly detect vibration-induced deflections. These scanning units act as mediators between the machine component vibrations and the control system, providing direct measurement data without requiring temporal analysis or dynamic models.
2Stability of the object's composition
If scale plates are made stiffer to suppress vibrations, then vibration suppression improves, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of trying to eliminate vibrations by making scale plates stiffer, the patent converts the harmful vibration effect into useful measurement information. The scanning units measure vibration-related deflections, and this data is used for active damping control, transforming the problem of vibrations into a solution for vibration suppression.
Solution Approach 2:
The system changes the approach from modifying the physical parameter of scale plate stiffness to modifying the control parameter through active damping. By measuring vibrations and applying compensatory control actions, the system achieves vibration suppression without changing the mechanical stiffness of the scale plates.
3Measurement precision
If multiple scanning units are added to detect vibrations, then measurement capability improves, but device complexity increases
Solution Approach 1:
The scanning units are designed with multi-functionality, serving both position measurement and vibration detection purposes. By strategically arranging a plurality of scanning units, the system simultaneously achieves rigid body position determination and vibration-related deflection detection without requiring separate dedicated sensors for each function.
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 precise and immediate detection of machine component vibrations, reducing positioning errors and enabling active damping, while also expanding the system's traversing range without requiring stiffer scale plates, and can be used to calibrate the system for deformations and errors in scale plates.
Implementation Method 1
at least six scanning units, which are arranged on the second machine component and are used for optical scanning of the measuring standard
Data Source
Figure 1~2
Figure 3
Figure 4a~4e
AI summary
The device has a measurement representation unit mounted on a first stationary machine component. Six scanning units (E1-E6) are mounted on a second movable machine component i.e. desk (T), and adapted for optical scanning of the measurement representation unit in two measuring directions in a displacement plane. The scanning units are assigned to each measuring direction and arranged non-point symmetrically in relation to a center part (S) of the second component. The scanning units having measuring directions in the displacement plane, are not arranged on a common connecting straight line.