Elevator Car Positioning via Vibration Damper Gain Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional elevator re-leveling methods in high-rise buildings face challenges due to decreased roping stiffness and time delays, leading to stability issues and reduced resonant frequency, which limit control logic gains and performance.
Innovation Solution
The implementation of a vibration damper system that adjusts motor control gains during re-leveling, using friction members to resist vertical movement and dampen vibrations, allowing for increased motor torque gains and improved re-leveling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional re-leveling control logic is used in high-rise buildings, then the system is simple and easy to implement, but the roping stiffness decreases and resonant frequency drops leading to stability issues and poor performance
Solution Approach 1:
A vibration damper is introduced as an intermediary mechanical component between the elevator car and the guide rail. This damper provides physical vibration suppression and stiffness support, allowing the control system to use higher gains without causing instability. The damper acts as a mediator that handles the mechanical vibration issues, enabling the control logic to achieve better performance without becoming overly complex.
Solution Approach 2:
The system dynamically adjusts control parameters (gains) based on the activation state of the vibration damper. When the damper is activated, the control logic switches to a second set of gains that are optimized for the dampened condition, allowing higher gains to be used safely. This parameter change enables the system to overcome the limitations of reduced roping stiffness without requiring a complete redesign of the control architecture.
2Productivity
If higher control gains are used to improve re-leveling speed and precision, then re-leveling performance improves, but system stability deteriorates due to reduced roping stiffness and resonant frequency
Solution Approach 1:
The vibration damper serves as a physical intermediary that suppresses resonant vibrations and provides additional stiffness to the system. This mechanical intervention allows the control system to safely employ higher gains for faster re-leveling without compromising stability. The damper absorbs the destabilizing vibrations that would otherwise amplify with higher gains.
Solution Approach 2:
The control system dynamically adapts its gains based on the vibration damper's activation state. When the damper is active, the system transitions to using higher gains optimized for rapid correction. This dynamic parameter adjustment allows the system to achieve high productivity when needed while maintaining stability through the dampened mechanical support.
3Manufacturing precision
If higher control gains are used to improve re-leveling precision, then positioning accuracy improves, but vibration and resonance increase
Solution Approach 1:
The vibration damper is positioned as a mechanical intermediary that directly counteracts resonant vibrations and bounce. By providing this physical damping mechanism, the system can apply higher control gains to achieve greater positioning accuracy without the harmful vibrations that would normally result from such aggressive control action.
Solution Approach 2:
The system converts the potential harm of high-frequency vibrations into a benefit by using the vibration damper to selectively suppress only the harmful resonant frequencies. This allows the control system to use high gains for precise positioning while the damper filters out the unwanted vibrations, effectively turning the aggressive control action into a beneficial precision tool without the negative side effects.
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 vibration damper system enhances re-leveling performance by minimizing resonant frequency excitation and enabling higher control gains, resulting in faster and more precise positioning of the elevator car, even in high-rise buildings with extended roping arrangements.
Implementation Method 1
A vibration damper is provided in an elevator system. The vibration damper includes a friction member configured to frictionally engage a guide rail of the elevator system when the vibration damper is in a deployed position.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An exemplary method of controlling elevator car position includes determining that an elevator car requires re-leveling and determining whether a vibration damper is activated. A gain for controlling operation of a motor responsible for moving the elevator car for the re-leveling is adjusted if the vibration damper is activated.