Elevator Rope Sway Estimation With Damping-Aware Switching
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Solution Overview
Problem
The existing rope sway detection apparatus in elevators calculates the transverse amplitude of the main rope assuming no vibration damping, leading to unnecessary operation method switches, which reduces user convenience by over-switching the elevator's operation method.
Innovation Solution
A sway amount estimation system that includes a sensing unit to detect building sway, a judgment unit to assess if the sway exceeds a threshold, and an estimation unit that calculates the sway amount based on sensed data and an estimation model incorporating displacement amplification effects, preventing unnecessary operation method switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rope sway detection apparatus calculates transverse amplitude assuming no vibration damping, then the calculation is simple, but the estimated sway amount becomes greater than actual amplitude leading to unnecessary operation method switches
Solution Approach 1:
The patent changes the parameters of the estimation model by incorporating vibration damping coefficients and displacement amplifier characteristics. The estimation unit uses updated parameters including damping ratio, natural frequency, and amplifier gain to calculate accurate sway amounts that reflect actual physical conditions, resolving the overestimation problem caused by ignoring damping effects
Solution Approach 2:
The patent introduces an estimation model as an intermediary between the simple calculation approach and accurate measurement. This model acts as a mediator that accounts for vibration damping and displacement amplification effects, producing corrected sway amount estimates that prevent unnecessary operation mode switches while maintaining computational efficiency
2Reliability
If the operation method is switched based on overestimated sway values, then safety control is activated, but user convenience is reduced due to unnecessary switches
Solution Approach 1:
The patent implements feedback by using the estimation unit to continuously monitor corrected sway amounts and compare them against thresholds. The control unit receives feedback from the estimation unit about whether actual sway exceeds safe limits, enabling intelligent decision-making that activates safety controls only when truly necessary, thus maintaining both reliability and user convenience
Data Source
AI summary
An object of the present invention is to provide a sway amount estimation system that can suppress a reduction in user convenience that would occur if the operation method is switched more than necessary. A sway amount estimation system (300) includes a sensing unit (78), a judgment unit (80), and an estimation unit (79). The estimation unit (79) calculates an estimated value of the amount of sway of an elevator rope due to vibration caused by building sway based on the sway sensed by the sensing unit (78) and an estimation model incorporating the effect of the displacement amplification of the displacement amplifier (7). The judgment unit (80) judges if the estimated value calculated by the estimation unit (79) is greater than a threshold for switching the operation method for the elevator apparatus (11).