Elevator Rope Vibration Damping With Variable Frequency Control
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Solution Overview
Problem
Conventional vibration damping systems for elevator ropes experience resonance issues due to a constant natural frequency, leading to instability when the natural frequency coincides with the vibration frequency of the vibration source.
Innovation Solution
A vibration damping system with a displacement amplifier that adjusts its amplification based on calculated natural and preset vibration frequencies, using a calculation unit and displacement amplification control unit to prevent resonance by altering the amplification factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional vibration damping device with constant natural frequency is used, then the device structure is simple, but resonance occurs when the natural frequency coincides with the vibration frequency of the elevator rope
Solution Approach 1:
The patent applies the dynamics principle by making the natural frequency of the vibration damping device variable rather than constant. The device includes a mechanism that allows the natural frequency to be adjusted dynamically, enabling the system to adapt when the elevator rope's vibration frequency changes, thereby avoiding resonance conditions while maintaining effective vibration damping.
Solution Approach 2:
The patent implements parameter changes by modifying the natural frequency parameter of the vibration damping device. By changing this critical parameter in response to detected vibration frequencies, the system prevents resonance without requiring complex structural modifications, thus resolving the contradiction between simple structure and resonance avoidance.
2Adaptability or versatility
If the natural frequency of the vibration damping system is kept constant, then the device complexity is low, but the system cannot adapt to different vibration frequencies of the elevator rope
Solution Approach 1:
The patent employs feedback by incorporating a frequency detection mechanism that monitors the vibration frequency of the elevator rope and uses this information to adjust the natural frequency of the vibration damping device accordingly. This feedback loop enables the system to adapt to different vibration frequencies while maintaining relatively simple overall structure.
Solution Approach 2:
The vibration damping device performs self-adjustment of its natural frequency based on the detected vibration characteristics of the elevator rope. This self-service capability allows the system to adapt to different operating conditions without requiring complex external control mechanisms, thus achieving frequency adaptability with minimal added complexity.
Data Source
AI summary
An object of the invention is to provide a vibration damping system that can avoid the occurrence of resonance of an elevator rope regardless of the vibration frequency of a vibration source. A vibration damping system (200) includes a displacement amplifier (7), a calculation unit (66), and a displacement amplification control unit (67). The displacement amplifier (7) is arranged along a given position in the longitudinal direction of the elevator rope. The displacement amplifier (7) amplifies a displacement due to vibration of the elevator rope based on a variable amplification factor. The calculation unit (66) calculates the natural frequency of the elevator rope. The displacement amplification control unit (67) controls the displacement amplification of the displacement amplifier (7) based on the natural frequency calculated by the calculation unit (66) and a preset vibration frequency.