Rolling Bearing Load Estimation During Rotational Speed Changes
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Solution Overview
Problem
Existing methods for measuring the load on rolling bearings in mechanical devices, such as wind turbines, face challenges in accuracy and cost, especially during instantaneous changes in rotational speed, and are inadequate for varying rotational frequencies.
Innovation Solution
A load estimating device comprising a vibration sensor, a rotational speed sensor, and an estimation portion that uses either a predefined table or a learned model to calculate the load based on measured vibration and rotational speed data, allowing for accurate load estimation even during rapid changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a strain gauge or displacement sensor is used to measure load, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical measurement systems (strain gauges, displacement sensors) with a vibration-based measurement approach. By measuring vibration characteristics of the rolling bearing and correlating them with load conditions, the system achieves load measurement without direct mechanical contact or complex sensor attachment to the bearing components.
Solution Approach 2:
The patent introduces vibration as an intermediary parameter to indirectly measure load. Instead of directly measuring load forces, the system measures vibration signals generated by the rolling bearing under load and uses these signals as a proxy to determine load conditions through correlation analysis.
2Device complexity
If vibration sensor is used to measure load, then device complexity is reduced, but measurement accuracy deteriorates during instantaneous rotational speed changes
Solution Approach 1:
The patent incorporates feedback by continuously monitoring rotational speed and using it to adjust the load estimation process. The rotational speed information feeds back into the vibration analysis, allowing the system to compensate for speed variations and maintain accurate load measurement during transient conditions.
Solution Approach 2:
The patent changes the analysis parameters dynamically based on rotational speed conditions. By adjusting vibration frequency bands, time windows, or correlation thresholds according to the current rotational speed, the system maintains measurement accuracy across varying operating conditions without requiring complex hardware modifications.
3Reliability
If load measurement is performed during instantaneous rotational speed changes, then reliability is improved, but measurement accuracy deteriorates due to varying rotational frequency
Solution Approach 1:
The patent makes the measurement system dynamic by adapting the vibration analysis parameters in real-time according to rotational speed changes. The system adjusts frequency analysis windows, time synchronization, and correlation thresholds dynamically, allowing accurate load measurement during transient operations rather than only during steady-state conditions.
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 extends the service life of rolling bearing-equipped devices by accurately monitoring and controlling loads during rotational speed changes, reducing the risk of failure and operational costs.
Implementation Method 1
a vibration sensor configured to measure vibration of the rolling bearing during rotation
Implementation Method 2
a rotational speed sensor configured to measure a rotational speed of the rolling bearing during rotation
Data Source
AI summary
This load estimating device for a rolling bearing comprises: a vibration sensor for measuring vibrations of the rolling bearing during rotation; a rotational speed sensor for measuring the rotational speed of the rolling bearing during rotation; a deriving means for deriving a vibration value for a predetermined vibration frequency, using vibration information measured by the vibration sensor; and an estimating means for estimating a load acting on the rolling bearing, said load corresponding to the rotational speed measured by the rotational speed sensor and the vibration value derived by the deriving means, using a table defining a correspondence relationship between the load acting on the rolling bearing, the vibration value for the predetermined vibration frequency, and the rotational speed.