Elevator Rope Sway Detection Using Dual-Car Segmentation
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Solution Overview
Problem
The existing elevator system's sensor precision decreases with increasing measurement distance, limiting high-precision vibration detection of the main rope to positions close to the car.
Innovation Solution
The system includes two vertically moving cars with detectors on each car to detect the position of the elongated object, allowing for precise detection of abnormal swaying and implementing control operations to prevent resonance and contact issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is provided on the car to detect vibration of the main rope, then the car's own vibration can be detected, but the measurement precision decreases steadily as the measurement distance increases, limiting high-precision detection to positions close to the car
Solution Approach 1:
The system divides the detection function into two independent cars: one car (first car) carries the detector to measure main rope vibration, while another car (second car) serves as the measurement target. This segmentation allows the detector to be positioned at optimal distances for high-precision measurement while still monitoring the overall system.
Solution Approach 2:
The main rope acts as an intermediary element connecting the detector on the first car to the measurement system. By detecting vibrations in the main rope itself rather than directly on the second car, the system achieves precise measurement of elongated object swaying through the rope's vibration characteristics.
2Area of stationary object
If the detector is positioned far from the elongated object to monitor overall system vibration, then broader coverage is achieved, but measurement precision decreases
Solution Approach 1:
The system uses the dynamic movement of the first car along the shaft to dynamically adjust the detection coverage. As the first car moves to different positions, it can detect vibrations at multiple locations along the main rope, providing comprehensive coverage while maintaining optimal measurement distance at each position.
Solution Approach 2:
The first car periodically moves along the shaft to different measurement positions, enabling the system to gather vibration data from multiple locations over time. This periodic movement provides both broad coverage and high-precision measurements at each discrete position.
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
Enables high-precision detection of swaying in elongated objects, preventing faults by controlling the elevator to stop on non-resonant floors and maintaining tension, thus enhancing safety and reducing maintenance costs.
Implementation Method 1
a detector provided on the second car in order to detect a position of the elongated object
Implementation Method 2
sway detecting means for detecting, on the basis of the position detected by the detector, that abnormal swaying requiring a control operation is occurring in the elongated object
Data Source
AI summary
An elevator system includes a car, a main rope, a car, a detector, and a sway detection unit. The car moves vertically. The main rope moves as the car moves. The car moves vertically. The detector is provided on the car. The detector detects the position of the main rope. The sway detection unit detects, on the basis of the position detected by the detector, that abnormal swaying requiring a control operation is occurring in the main rope.