Mining Shovel Cable Tension Monitoring via Vibration Frequency
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Solution Overview
Problem
There is a need for effective monitoring methods and systems to assess the productivity, operating health, and potential failures of mining shovels, particularly in determining the tension of suspension cables and estimating forces on components, which are critical for preventing failures and optimizing operations.
Innovation Solution
A method involving the use of accelerometers mounted on suspension cables to extract the fundamental frequency of vibrations, which is proportional to cable tension, and processing these signals to determine changes over time, facilitating the assessment of the operating state of the mining shovel, including potential failures and payload estimation through kinematic and dynamic calibration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring methods are used for mining shovel suspension cables, then the system complexity is low, but the measurement precision of cable tension and force estimation is insufficient
Solution Approach 1:
The patent utilizes the natural vibration of suspension cables to determine cable tension. By measuring the fundamental frequency of cable vibration using accelerometers and applying the relationship between vibration frequency and tension, the system achieves precise tension measurement without requiring direct force sensors on the cables, thus improving measurement precision while maintaining reasonable system complexity
Solution Approach 2:
The patent replaces direct mechanical force measurement methods with vibration-based measurement. Instead of using complex force sensors or strain gauges directly on the suspension cables, the system uses accelerometers to measure vibration frequencies and calculates tension through signal processing, substituting a simpler mechanical vibration measurement approach for complex direct force measurement
2Reliability
If real-time monitoring of cable tension is implemented, then the reliability of mining shovel operations is improved, but the use of energy and computational resources increases
Solution Approach 1:
The patent implements periodic monitoring of cable tension by analyzing vibration signals at specific intervals during shovel operations. The system processes accelerometer data to extract fundamental frequencies and determines tension values periodically rather than continuously, achieving reliable real-time monitoring while reducing energy consumption and computational load compared to continuous high-frequency sampling
Solution Approach 2:
The system uses the existing vibration of suspension cables during normal shovel operations as the measurement source. The cables naturally vibrate under load during digging and movement, and the system harnesses these self-generated vibrations for tension measurement without requiring external excitation devices or additional energy input to generate measurement signals
3Measurement precision
If accelerometers are mounted on suspension cables to measure vibration, then the measurement precision of cable tension is improved, but the difficulty of detecting and measuring increases due to signal processing complexity
Solution Approach 1:
The patent extracts the fundamental frequency component from the complex acceleration signal by applying signal processing techniques such as Fast Fourier Transform (FFT) or other spectral analysis methods. This extraction isolates the relevant vibration information from noise and other signal components, improving measurement precision while managing processing complexity through focused frequency domain analysis
Solution Approach 2:
The patent introduces an intermediate processing step that transforms raw accelerometer signals into fundamental frequency values through spectral analysis. This intermediary transformation converts complex time-domain vibration signals into simpler frequency-domain representations, making the measurement process more manageable and the tension calculation more straightforward
4Productivity
If comprehensive force estimation on shovel components is performed, then the productivity optimization capability is improved, but the device complexity increases due to multiple sensors and calibration processes
Solution Approach 1:
The patent makes the suspension cable vibration measurement system serve multiple functions: it measures cable tension directly, estimates forces on boom and other components through dynamic analysis, and provides data for productivity optimization. This multi-functionality allows comprehensive force estimation using the same sensor infrastructure, improving productivity capability without proportionally increasing device complexity
Solution Approach 2:
The patent implements preliminary calibration processes during system installation and setup to establish the relationship between cable tension measurements and forces on various shovel components. By performing this calibration work in advance, the system can subsequently estimate multiple forces using the calibrated parameters without requiring complex real-time calculations or additional sensors during actual operations
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 method enables real-time monitoring of cable tension and force estimation, allowing for early detection of potential failures and optimizing operations by providing accurate data on the structural integrity and payload weight, thereby enhancing the reliability and efficiency of mining shovel operations.
Implementation Method 1
processing the accelerometer signals to extract a fundamental frequency associated with vibrations in each suspension cable, the fundamental frequency being proportional to a tension in the suspension cable
Data Source
AI summary
A method and system for monitoring a mining shovel having a boom supported by a plurality of suspension cables is disclosed. The method involves receiving accelerometer signals from a plurality of accelerometers, each accelerometer being mounted on one of the plurality of suspension cables. The method also involves processing the accelerometer signals to extract a fundamental frequency associated with vibration of each suspension cable, the fundamental frequency being proportional to a tension in the suspension cable. The method further involves determining changes in the fundamental frequency as a function of time, the changes being indicative of an operating state of the mining shovel.