Elevator Rope Vibration Suppression via Dynamic Displacement Amplifier
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Solution Overview
Problem
The existing vibration suppression device for elevator ropes produces a nonlinear negative restoring force due to an instability mechanism involving an inverted lever and spring, leading to unstable displacement and a narrow movable range of the rope-like body.
Innovation Solution
A vibration suppression device with a movable unit and a stopper that includes a displacement amplifier and a restriction member, where the displacement amplifier provides an attractive force that amplifies displacement, and the restriction member prevents the rope-like body from approaching closer than a set distance, stabilizing displacement and expanding the movable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nonlinear negative restoring force is produced by combining an inverted lever and spring, then vibration suppression is achieved through friction resistance, but displacement of the main rope becomes unstable when the negative restoring force exceeds the positive restoring force
Solution Approach 1:
The patent employs a dynamic system where a movable weight can shift position along the rope based on vibration conditions. The weight moves to different locations (first position, second position, or third position) depending on the amplitude and characteristics of rope vibration, allowing the system to adaptively provide negative restoring force only when needed while maintaining stability during normal operation
Solution Approach 2:
The system changes the parameter of negative restoring force magnitude by adjusting the position of the movable weight. When the weight is at the first position, maximum negative restoring force is applied for strong vibration suppression. When moved to the second or third position, the negative restoring force is reduced or eliminated, preventing displacement instability while maintaining vibration suppression capability
2Reliability
If the negative restoring force is increased to amplify displacement for vibration suppression, then vibration inhibition is enhanced, but the movable range of the rope-like body becomes narrower
Solution Approach 1:
The movable weight dynamically adjusts its position along the rope to modulate the negative restoring force. During high-amplitude vibrations, the weight remains at positions that provide strong negative restoring force for effective vibration suppression. During low-amplitude operations or when large displacement is needed, the weight moves to positions that reduce or eliminate the negative restoring force, thereby expanding the movable range while maintaining vibration suppression capability when required
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
The device effectively inhibits unstable displacement and widens the movable range of the rope-like body, enhancing vibration suppression performance by balancing the negative and positive restoring forces.
Implementation Method 1
a first displacement amplifier which is arranged to be directed to a first position in a longitudinal direction of the rope-like body and amplifies displacement of vibration of the rope-like body by an attractive force which becomes stronger as the rope-like body approaches closer
Data Source
AI summary
There is provided a vibration suppression device for a rope-like body of an elevator that can inhibit displacement of the rope-like body from becoming unstable due to amplification of the displacement and can make a movable range of the rope-like body wider. A vibration suppression device (20) includes a movable unit and a stopper. The movable unit can move in a direction in which a distance from an equilibrium position (19) of the rope-like body changes. The stopper restricts movement of the movable unit to a position closer than a first distance (d1) from the equilibrium position (19). The movable unit includes a displacement amplifier and a restriction member. The displacement amplifier is arranged to be directed to a first position (P1) of the rope-like body. The displacement amplifier amplifies displacement of the rope-like body. The restriction member inhibits the rope-like body from approaching the displacement amplifier.