Semi-Active Actuator Damping Control for Elevator Lateral Vibration
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Solution Overview
Problem
Elevator systems face challenges in reducing lateral vibration due to guide rail misalignment or distortion, leading to discomfort for passengers and increased installation and maintenance costs, as conventional passive and active vibration reduction methods have limitations in cost, durability, and ride quality.
Innovation Solution
A semi-active vibration reduction system using controllable magnetorheological or electrorheological fluids in semi-active actuators, which adjust damping coefficients based on real-time vibration information and elevator system state, reducing the need for precise guide rail alignment and external power, thereby improving ride quality and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional passive vibration reduction systems with fixed springs and rubbers are used, then the system structure is simple and cost is low, but the ride quality is poor and guide rail installation accuracy requirements are stringent
Solution Approach 1:
The patent applies semi-active actuators with adjustable damping coefficients that can be dynamically modified based on real-time vibration measurements. The damping coefficient adjustment mechanism allows the system to adapt to different operating conditions, thereby reducing sensitivity to guide rail installation errors while maintaining relatively simple system structure compared to fully active systems.
2Reliability
If fully active vibration reduction devices are used to improve ride comfort, then vibration attenuation performance is excellent, but the cost and durability concerns increase due to energy consumption and power requirements
Solution Approach 1:
The patent employs semi-active actuators that modify their damping parameters in response to vibration conditions rather than maintaining constant high-energy active control. The actuators adjust their damping coefficients based on measured vibration levels, allowing effective vibration reduction while consuming significantly less energy than fully active systems, thereby improving reliability and reducing operational costs.
3Object-affected harmful factors
If guide rail installation accuracy is increased to reduce lateral vibration, then ride quality improves, but installation and maintenance costs increase
Solution Approach 1:
The patent implements a feedback control system where vibration sensors continuously monitor lateral vibrations and feed this information to a controller that adjusts the damping coefficients of semi-active actuators. This closed-loop control effectively reduces lateral vibrations caused by guide rail imperfections without requiring high installation accuracy, thereby reducing installation and maintenance costs while improving ride quality.
4Manufacturing precision
If semi-active actuators with adjustable damping coefficients are used, then ride quality improves and guide rail accuracy requirements are relaxed, but system complexity and control mechanism requirements increase
Solution Approach 1:
The patent designs the semi-active actuator system with self-adjusting capabilities where the actuators automatically modify their damping coefficients based on real-time vibration feedback without requiring complex external control mechanisms. The system uses straightforward control logic that adjusts damping parameters in response to measured vibration levels, achieving effective vibration reduction with relatively simple control architecture.
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 system effectively suppresses peak resonance at low frequencies without compromising mid-range frequency isolation, enhancing ride comfort and reducing installation and maintenance costs while addressing reliability issues associated with fully active systems.
Implementation Method 1
damping devices containing controllable fluids, e.g. magnetorheological (MR) or electrorheological (ER) fluids
Implementation Method 2
damping devices containing controllable fluids, e.g. magnetorheological (MR) or electrorheological (ER) fluids
Implementation Method 3
A semi-active actuator, which allows for the adjustment of actuator parameter, such as viscous damping coefficient
Data Source
AI summary
A system and method reduce lateral movement of a car in an elevator system by detecting vibration of the car as a vibration signal. A damping coefficient for a feedback signal is determined according to the vibration signal and a state of the elevator system. A semi-active actuator is arranged between the car and a roller guide assembly. The semi-active actuator includes a rheological fluid, and flow characteristics of the rheological fluid are actuated according to the feedback signal to reduce the lateral movement of the car.