Measuring Arm Mass Damping for Vibration-Stable CMM Probing
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Solution Overview
Problem
Coordinate measuring machines experience vibrations during the measurement of large components, particularly internal features of rotationally symmetrical components like gears, due to the long distance between the measuring arm's drive and the measuring head, leading to inaccurate measurements and increased measuring time.
Innovation Solution
Integration of an auxiliary mass damper into the measuring arm's support structure to dampen vibrations, allowing for precise and rapid data acquisition without increasing weight or reducing measuring speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the measuring arm is extended to measure large components, then the measuring range is improved, but vibration sensitivity increases
Solution Approach 1:
An auxiliary mass damper is introduced as an intermediary element between the measuring arm structure and the measuring head. This damper acts as a mediator that absorbs and dissipates vibration energy, preventing vibrations from the extended arm from reaching the measuring head, thus allowing large component measurement without increased vibration sensitivity
Solution Approach 2:
The invention converts the harmful vibrations that naturally occur in extended measuring arms into a beneficial damping effect. By strategically placing mass dampers at specific locations on the measuring arm, the vibrational energy is transformed into harmless heat through internal friction, allowing the system to tolerate extended arm lengths without measurement degradation
2Object-affected harmful factors
If the measuring arm is stiffened to reduce vibrations, then vibration damping is improved, but weight increases
Solution Approach 1:
Instead of changing the structural parameters of the measuring arm (such as increasing cross-section or material density), the invention changes the dynamic parameters by adding tuned mass dampers. These dampers are designed with specific mass, stiffness, and damping characteristics that are optimized to counteract the arm's natural vibrations, achieving vibration control without modifying the arm's fundamental structural parameters
Solution Approach 2:
Rather than uniformly stiffening the entire measuring arm (which would increase overall weight), the invention applies localized damping solutions at critical positions where vibrations most affect measurement accuracy. The mass dampers are strategically placed near the measuring head or at nodes of vibration modes, providing targeted vibration control only where needed, thus minimizing overall weight increase
3Measurement precision
If the axis speeds are reduced to minimize vibrations, then measurement accuracy is improved, but measuring time increases
Solution Approach 1:
The mass dampers are pre-configured and pre-tuned to the specific vibration characteristics of the measuring arm before measurement begins. This preliminary setup ensures that when high-speed measurement is performed, the dampers are already in position and properly tuned to counteract vibrations, eliminating the need for speed reduction or waiting periods for vibrations to subside
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 auxiliary mass damper effectively reduces vibrations near the measuring head, enabling efficient and precise measurement of large components, including internal features of gears, without increasing the measuring arm's weight or slowing down the measurement process.
Implementation Method 1
The support structure of the measuring arm has an auxiliary mass damper for vibration damping
Data Source
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AI summary
Measuring arm for a coordinate measuring machine, with a support structure (12), wherein the support structure (12) has a fastening section (14) for fastening the measuring arm (10) to a movable slide (104) of the coordinate measuring machine (100), with a measuring head (16) for acquiring measured values on a component to be measured, wherein the measuring head (16) is held on the support structure (12), wherein the support structure (12) has an auxiliary mass damper (18) for vibration damping.