Rotor Unbalance Measurement Decoupling Machine Error
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Solution Overview
Problem
Current methods for evaluating rotor unbalance lack precision, as they do not clearly decouple the unbalance of the balancing machine from the rotor, leading to unclear zero-unbalance points and traceability issues, especially when measurements from different machines vary.
Innovation Solution
A method involving multiple measurements and vector calculations to determine rotor unbalance by setting a zero angle reference, measuring unbalances in selected planes before and after rotating the rotor, and using these measurements to isolate and correct the unbalance of both the machine and the rotor, ensuring results are in SI units for traceability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the current method based on ISO2953:1999 or GB/T4201-2006 is used to measure rotor unbalance, then the measurement can be performed using existing standards, but the measurement precision is insufficient because the unbalance of the machine itself cannot be separated from the rotor unbalance
Solution Approach 1:
The patent segments the total measured unbalance into two distinct components: the unbalance of the balancing machine itself and the unbalance of the rotor. By performing measurements at different angular positions and using vector calculations, the method separates these two components mathematically, allowing precise determination of the rotor's actual unbalance independent of machine unbalance.
Solution Approach 2:
The patent introduces an intermediary approach by using multiple measurement positions (different angular references) as mediators to isolate the rotor unbalance from machine unbalance. The vector calculations serve as an intermediary mathematical tool that processes the multiple measurements to extract the pure rotor unbalance component.
2Reliability
If traditional balancing machine evaluation methods are used, then the evaluation can be performed with existing terms like Minimum Achievable Residual Unbalance and Unbalance Reduction Ratio, but the traceability of unbalance measurement is not established
Solution Approach 1:
The patent performs preliminary actions by establishing a zero-unbalance reference point through multiple measurements and vector calculations before actual balancing operations. This preliminary characterization of the machine's unbalance allows subsequent measurements to be traceable and accurate, enabling verification of balancing quality against a known reference.
Solution Approach 2:
The patent implements feedback by using the measured machine unbalance characteristics to correct and verify subsequent rotor unbalance measurements. The established zero-unbalance point and machine unbalance profile provide continuous feedback for validating measurement accuracy and ensuring traceability across different measuring machines.
3Measurement precision
If measurements are taken at multiple angular positions and vector calculations are performed, then the rotor unbalance can be accurately determined and machine unbalance separated, but the measurement and calculation process becomes more complex
Solution Approach 1:
The patent applies dynamics by introducing angular rotation as a dynamic variable. Measurements are taken at different angular positions of the rotor, and the change in measured unbalance vectors with rotation angle provides the necessary information to separate machine unbalance from rotor unbalance through mathematical analysis.
Solution Approach 2:
The patent transitions from a single-dimensional unbalance measurement to a multi-dimensional approach by incorporating angular position as an additional dimension. Multiple measurements at different angles create a vector space that allows separation of the two unbalance components through spatial and angular analysis.
Data Source
AI summary
A method to measure and determine the unbalance of a rotor, by decoupling the unbalance of the balancing machine and the unbalance of the rotor, which includes the following procedures make the zero angle reference on the rotor or on the balancing machine, select two planes on the rotor, and use a balancing machine to measure the unbalances of the rotor in the two planes, these unbalances are designated as first nominal unbalances.