Elevator Rope Tension Measurement via Adaptive Frequency Calculation
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Solution Overview
Problem
Existing elevator rope tension measurement systems suffer from increased measurement errors due to the method used for calculating the frequency of the vibration waveform, which affects the accuracy of quantitatively measuring rope tension.
Innovation Solution
An elevator rope tension measurement system that includes a vibration waveform collection unit and a frequency calculation unit, which selects a method for calculating frequency based on the measurement resolution derived from the collection time period and cycle, thereby reducing measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a frequency calculation method is selected based on calculation cost, then the computational efficiency is improved, but the measurement precision deteriorates
Solution Approach 1:
The patent applies dynamics by making the frequency calculation method selectable and adaptable based on measurement conditions. The system dynamically chooses between different calculation methods (such as FFT or zero-crossing methods) depending on the collection time period and cycle, optimizing both computational efficiency and measurement precision for each specific scenario rather than using a fixed method
Solution Approach 2:
The patent changes the parameter of calculation method selection based on measurement resolution requirements. By calculating the measurement resolution from collection time period and cycle, the system adjusts which frequency calculation method to use, thereby resolving the contradiction between computational efficiency and measurement precision through parameter-based adaptation
2Measurement precision
If the collection time period and cycle are increased to improve measurement resolution, then the measurement precision is improved, but the measurement time is increased
Solution Approach 1:
The system dynamically adjusts the frequency calculation method based on the collection time period and cycle. When longer measurement times are used to achieve higher resolution, the system selects more accurate but computationally intensive methods, thereby optimizing the trade-off between measurement time and precision
Solution Approach 2:
The patent implements feedback by calculating measurement resolution from collection parameters and using this information to select the appropriate frequency calculation method. This feedback loop ensures that the calculation method matches the measurement resolution requirements, avoiding unnecessary computational overhead while maintaining required precision
Data Source
AI summary
There is provided an elevator rope tension measurement system that can reduce measurement error when the tension of the rope of an elevator is quantitatively measured. An elevator rope tension measurement system includes a vibration waveform collection unit configured to collect a vibration waveform of a rope of an elevator; and a frequency calculation unit configured to select, based on a measurement resolution calculated from a collection time period and a collection cycle for collecting the vibration waveform by the vibration waveform collection unit, a method for calculating a frequency of the vibration waveform collected by the vibration waveform collection unit.