Lift Cage Vibration Damping via Speed-Variable Regulator Amplification
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Solution Overview
Problem
Existing vibration damping systems for lift cages are ineffective during startup and shutdown, and loading/unloading due to their linear and time-invariable nature, which fails to account for non-linear processes, leading to unwanted vibrations and shocks.
Innovation Solution
A speed-variable and time-variable amplification mechanism for the regulating device, allowing adaptation to non-linear processes by using two internal regulators - a position regulator and an acceleration regulator, with amplification adjusted based on vertical speed and time delays, ensuring effective damping during startup, shutdown, loading, and unloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a linear and time-invariable regulator is used for vibration damping, then the system structure is simple and easy to implement, but unwanted vibrations and shocks occur during startup, shutdown, loading, and unloading due to inability to handle non-linear processes
Solution Approach 1:
The regulator transitions from a static linear design to a dynamic adaptive design where the amplification factor changes over time and with system state. The regulator uses speed-variable and time-variable amplification to adapt to different operating conditions (startup, shutdown, normal operation), enabling effective damping during non-linear transitions while maintaining simplicity during steady-state operation.
Solution Approach 2:
The key parameter changed is the amplification factor of the regulator, which is made variable instead of constant. By adjusting the amplification factor based on speed and time, the system can handle non-linear processes effectively. The amplification is increased during critical transition phases (startup, shutdown) and reduced during normal operation, resolving the contradiction between simplicity and effectiveness.
2Reliability
If the regulator amplification is increased to suppress vibrations during non-linear processes, then damping performance improves, but the system becomes more complex and requires speed-variable and time-variable amplification mechanisms
Solution Approach 1:
The regulator is segmented into multiple functional components: a base linear regulator for steady-state operation, and separate speed-variable and time-variable amplification modules for handling non-linear transitions. This segmentation allows the complex adaptive functions to be added as modular components rather than redesigning the entire regulator, thus managing complexity while improving effectiveness.
Solution Approach 2:
The regulator is designed to perform multiple functions: it operates as a simple linear regulator during normal steady-state conditions, and automatically switches to adaptive mode with variable amplification during startup, shutdown, and loading/unloading phases. This multi-functionality allows a single regulator design to handle both simple and complex scenarios without requiring entirely separate systems.
3Device complexity
If a linear regulator is used, then the regulator design is simple and computationally efficient, but it cannot adapt to non-linear changes in system state during startup and shutdown
Solution Approach 1:
The regulator incorporates dynamic adaptation capabilities through speed-variable and time-variable amplification factors that automatically adjust based on system state. During startup and shutdown when non-linear effects are prominent, the amplification increases to provide appropriate damping. During normal operation, the regulator reverts to simple linear behavior, maintaining design simplicity while gaining adaptability when needed.
Data Source
AI summary
Equipment for reducing vibrations of a lift cage guided at rails comprises a plurality of guide elements for guiding the lift cage along the rails, a sensor for detecting positional changes of the lift cage and/or of accelerations occurring at the lift cage, an actuator arranged between the lift cage and the guide elements and a regulating device which, on the basis of the values transmitted by the sensor, controls the actuator for changing the position of the cage relative to the rails. The regulating device has an amplification which is variable in dependence on the vertical speed of the lift cage. The amplification of the regulating device is continuously raised after activation of the regulating device and continuously lowered after switching-off of the regulating device.